The electrophilicity of atom, ion and the molecule property to accept the electron. The order of electrophilicity of carbonyl carbon is :
RCHO > R₂CO > RCO₂R'
The electrophiles are the species that are electron deficient. The electrophiles are attracted towards the electron rich center. For the carbocations the α carbons of the carbonyls, or the atoms with lots of electron withdrawing groups are the great electrophiles. The electrophiles are the species which makes the bond with the nucleophiles. The electrophiles species that have an atom with the charge +. The aldehyde towards nucleophilic reactions are more reactive than the ketones due to the steric hindrance.
The presence of the two substituents in the ketones hinders. The reason for the ester is same that is due to steric .
Thus, the electrophiles are the electron deficient and are attracted to the electron rich center.
The question is incomplete , the complete question is :
Rank the electrophilicity of the center carbons from most to least electrophilic of the below molecules and explain your answer.
a) RCHO
b) R₂CO
c) RCO₂R'
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in a 52 weeks high and low, if the numbers show difference between each other, there is less risk of loss - but there is also less opportunity for gain, either.
Smaller numbers mean less risk of losing, but less chance of gain, Volatility.
What is gain?In electronics, gain is a measure of the ability of a two-terminal circuit (often an amplifier) to increase the power or amplitude of a signal from its input. Adjusting the gain control sets the amount of distortion in the sound no matter how loud the final volume is set. This means that the gain setting determines how clean or dirty the sound is, regardless of the master volume setting.Gain is simply the amplification factor, i.e. the parts of the output power to input power. Wins are often expressed in percentages, especially for small wins. Example 3% of ratio signifies to a power gain of 1.03.to learn more about gain from the given link:
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What is the answer/solution to this problem SiI4 + Mg
SiI4 + 2Mg → Si + 2MgI2 is the the answer/solution to this problem SiI4 + Mg which expresses its balanced equation.
What is Silicon?Silicon is described as a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor.
There are four rules to balance a chemical equation and it is shown below:
Check that all the formulae in the equation are correct.Deal with only one element at a time.Balancing is adding BIG numbers. You cannot change any of the small numbers in a chemical formula. Check each element again and repeat step 3 again if needed.Learn more about chemical equation at: https://brainly.com/question/29886207
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What amount of heat (in kJ) is required to convert 13.7 g of an unknown liquid (MM = 83.21 g/mol) at 19.2 °C to a gas at 93.5 °C? (specific heat capacity of liquid = 1.58 J/g･ °C; specific heat capacity of gas = 0.932 J/g･ °C; ∆Hvap = 22.5 kJ/mol; normal boiling point, Tb = 57.3 °C)
Why is the mass of Lithium listed on the periodic table 6.941 and not 6 or 7?
you analyze a sample of carbon and determine that 6% of the carbon atoms in your sample have a mass number (atomic mass) greater than 12, (12 is the normal atomic mass of carbon). based on these results, which of the following can you reasonably conclude?
If you analyze a carbon sample and discover that 6% of the carbon atoms have an atomic number greater than 12, you may safely assume that 6% of the sample is made up of carbon isotopes.
Carbon-12 (12 C), which has six neutrons in addition to its six protons, is by far the most common isotope of carbon. The following-heaviest isotope of carbon, carbon-13 (13 C), has seven neutrons. They are both referred to as stable isotopes since neither 12 C nor 13 C experience radioactive decay over time. The nuclear charge number (sign Z) of an atomic nucleus is the chemical element's atomic number. The proton number in regular nuclei is equivalent to this (np).
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important of science
Answer:Science is important because science
is the the way to know about other things that we didn't know about our planet and many other things.
Explanation:thank you hope it
Drag and drop the following building materials from lowest to highest based on their
porosity.
Lowest
Concrete
Oak
2nd Lowest
Clay
2nd Highest
Slate
Highest
Due to their porous and permeable nature, gravel and sand are excellent aquifer materials. The most permeable material is gravel.
What is porosity of building materials?The porosity of a substance is determined by how much of its total volume is made up of such spaces as a proportion of its entire volume made up of solids and pores. Common building materials like plaster, concrete, and brick all have varying degrees of porosity, falling between 50% and 65% for plaster, 40% for concrete, and 55% for brick.Glass, polymers, metals, and varnished wood are a few materials that don't have pores.Microporous, mesoporous, and macroporous materials are the three sizes of porous materials, respectively.Due to their frequent formation at depth and interlocking crystal structure, igneous or metamorphic rocks have the lowest primary porosity.To learn more about materials refer to:
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heating use copper tubing Hot water runs through and heats the copper tubing , which in heats aluminum finsis actually the aluminum fins that heat the air rising through the How much energy would it take to heat a section of the copper tubing that weighs about 555.0 gfrom 1.89 deg * C to 27.75 deg * C Copper has a specific heat of 0.3850(J/g)*^ C. Express your answer to four significant figures .m
A total of 1397 j of heat are required, a substance's specific heat is the amount of energy required to increase its temperature by one degree Celsius (°C) for one gram of that substance.
Describe precise heat in your own words?A substance's specific heat is the amount of energy required to increase its temperature by one degree Celsius (°C) for one gram of that substance.
In comparison to other substances, water has a high specific heat, which means that raising its temperature requires more energy.
Explanation:
Data provided
Copper tubing weighs 595.0 g in total.
15.18 °C when temperature is initial
Finished temperature was 21.28 °C.
Copper's particular heat is equal to 0.3850 j/g°C.
Heat needed in terms of =?
Solution:
Thermodynamic shift
ΔT = T2 - T1
ΔT = 21.28 - 15.18 = 6.1 °C
Formula:
Q = m. c. ΔT
Q is the heat flux
m Equals mass
c is the specific heat
T is the temperature change.
The values will now be entered into the formula.
Q = m. c. ΔT
Q = 595 g. 0.3850 j/g°C . 6.1 °C
Q = 1397.36 j
A total of 1397 j of heat are required.
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nacl solutions of equal volume and concentration were kept in flasks and held at different temperatures. the two solutions were combined in a larger flask. based on this information, which of the following predictions is correct?
When equal volume and concentration of NaCl solutions, held at different temperatures, are combined in a larger flask, the final solution will have the following characteristics:
The final concentration of NaCl will be the same as the initial concentrations of the two solutions that were combined. This is because the volume and concentration of the solutions were equal, and therefore the number of moles of NaCl in each solution was also equal. When equal moles of a substance are combined, the concentration of that substance in the final solution will be the same as the initial concentrations.The final temperature of the solution will be a function of the initial temperatures of the two solutions and the heat capacities of the solutions. The heat capacity of a solution is the amount of heat required to raise the temperature of a given amount of the solution by one degree. If the heat capacities of the solutions are equal, then the final temperature will be the average of the initial temperatures. If the heat capacities are not equal, then the final temperature will be closer to the solution with the larger heat capacity.If the initial temperatures of the two solutions are very different, the mixing process may cause heat loss or gain to the surroundings, depending on whether the initial temperature of the solution is higher or lower than the surrounding temperature.In summary, the combination of equal volume and concentration of NaCl solutions, held at different temperatures, in a larger flask will result in a solution with the same NaCl concentration but a temperature that is determined by the initial temperature and heat capacities of the solutions.
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What will happen when equal volume and concentration of NaCl solutions, held at different temperatures, are combined in a larger flask?
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A bag of potato chips is sealed in a factory near seal level. The atmospheric pressure at the factory is 761.3 mm Hg. The pressure inside the bag is the same. What is the pressure inside the bag of potato chip in kPa? kPa (ROUND TO THE NEAREST WHOLE NUMBER WHEN TYPING YOUR ANSWER.)
50 points
To convert the pressure inside the bag from mm Hg to kPa, we can use the conversion factor:
1 kPa = 7.5 mm Hg
So, we can divide the pressure in mm Hg by 7.5:
761.3 mm Hg / 7.5 = 101.5 kPa
So, the pressure inside the bag of potato chips is approximately 101.5 kPa.
It is important to note that the conversion factor of 1 kPa = 7.5 mm Hg, is an approximation and it can vary depending on the temperature and altitude.
Therefore, the pressure inside the bag of potato chip in kPa is 101 kPa (rounded to the nearest whole number)
hemiacetals are the product of a reaction between oh oh an aldehyde and one equivalent of alcohol. h r3 similarly, hemiketals form by a reaction between a r or1 or1 r ketone and one equivalent of alcohol. the reaction hemiacetal hemiketal can be either inter- or intramolecular. the general structures are:
When an aldehyde or ketone combines with an alcohol in the presence of a potent acid catalyst, hemiacetals are the intermediate molecules that result.
What is hemiacetal?Alcohol and ether are joined to the same carbon atom as hemiacetals. Hydrogen is positioned at the fourth bonding position. An aldehyde is the precursor of a hemiacetal.
A hemiacetal's basic structure is R1-C(OH)-R2-whereas a hemiketal's basic structure is R1-C(OR2)-R3-. Intermolecular reactions can occur depending on the starting components and environmental factors. The removal of the alcohol readily transforms hemiacetals and hemiketals into the equivalent aldehyde or ketone, indicating that in general, these molecules are relatively unstable.
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Enter your answer in the provided box. Hydrogen sulfide decomposes according to the following reaction, for which Kc 9.30x10 S at 700 C: 2 H2 S(g) 2 H2(g)+S2(g) If 0.49 mol of H2 (g) at 700 C? S is placed in a 3.0-L. container, what is the equillbrium concentration of H
When the Hydrogen sulfide decomposes according , the equilibrium concentration of H₂ is 0.0019 mol/L.
Given that :
Numbers of moles of H₂S = 0.49 moles
The Volume = 3.0 L
The Equilibrium constant = 9.30 × 10⁻⁸
The reaction is given as :
2H₂S ⇄ 2H₂(g) + S₂(g)
Initial concentration = 0.49 / 3
= 0.16 mol
2H₂S ⇄ 2H₂(g) + S₂(g)
Initial 0.9166 0 0
Change -2 x +2 x + x
Equilibrium (0.16 - 2x) 2x x
kc = [H₂]²[S₂]² / [H₂S]²
9.30 × 10⁻⁸ = (2x)²(x²) / ( 0.16 - 2x)²
x = 9.5 × 10⁻⁴
The equilibrium concentration for H₂ = 2x
= 2 × 9.5 × 10⁻⁴
= 0.0019 mol/L
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Charlotte is driving at 69.8 mi/h and receives a text message. She looks down at her phone and takes her eyes off the road for 3.27 s. How far has Charlotte traveled in feet during this time?
Charlotte is driving at 69.8 mi/h and receives a text message. She looks down at her phone and takes her eyes off the road for 3.27 s. 102.02 m far has Charlotte traveled in feet during this time.
What is speed ?The term speed is defined as the rate of change of position of an object in any direction.
Given:
The speed at which charlotte is driving = 69.8 mi/h
The time which she took of her eyes from the road = 3.27 s
During the entire journey, the time at which she took her eyes off the road, she is probably not driving.
We will have to convert the 69.8 mi/h to m/s
Since 1 mi/hr = 0.44704 m/s
69.8 mi/h will be:
= (69.8 mi/hr × 0.44704 m/s) ÷ 1 mi/hr
= 31.20 m/s
Now, using the relation:
Speed = distance/ time
31.20 m/s = (distance) / 3.27s
By Cross multiplying
Distance = 31.20 m/s × 3.27s
Distance = 102.02 m
Thus, Charlotte traveled by feet for 102.02 m during this time.
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Which statement is the scientific rationale for prescribing and administering donepezil (Aricept), a cholinesterase inhibitor?
A. Aricept works to bind the dopamine at neuron receptor sites to increase ability.
B. Aricept increases the availability of acetylcholine at cholinergic synapses.
C. Aricept decrease acetylcholine in the periphery to increase movement.
D. Aricept delays transmission of acetylcholine at the neuronal junction.
The scientific basis for prescribing and giving donepezil (Antidepressants), a cholinesterase inhibitor, is that it enhances the accessibility of acetylcholine through cholinergic synapses.
A cholinesterase inhibitor's function is what?The degradation of acetylcholine is slowed down by cholinesterase inhibitors. They use it to treat dementia, including signs of Alzheimer's. This activity discusses the many applications of alkylating drugs in the treatment of neurodegenerative disorders as well as their recommendations, modes of action, and restrictions.
What are the three cholinesterase inhibitors?Galantamine as well as rivastigmine are two of the three antidepressants that have been approved for the management of cognition brought on by Parkinson disease. They are thought to work by compensating for reduced cholinergic synaptic transmission, which is another feature of VCI.
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which of the following elements will have s and p orbitals
he
li
ca
o
fill in the blank. complete the energy maximum electron capacity for each energy level. energy level 1 maximum electron capacity is choose___ . energy level 2 maximum electron capacity is choose___. energy level 3 maximum electron capacity is choose___. energy level 4 maximum electron capacity is choose___.
The maximum electron capacity at energy level 1 is 2. The maximum electron capacity at energy level 2 is 8. Maximum electron capacity at energy level 3 is 18. The maximum number of electrons at energy level 4 is 32.
What is electron?Having a negative electric charge, an electron is a subatomic particle. Together with protons and neutrons, it is one of the basic building blocks of atoms.
The chemical characteristics of elements are determined by electrons, which are found in the valence shell, the outermost shell of an atom. In addition, they have a role in the production of magnetism, electrical conduction, and chemical processes. Additionally, as in an electron beam, electrons can also exist freely and independently.
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Explain why the name shown below is incorrect for the compound MgCl,?
Name: Magnesium Dichloride
Which of the following is not one of the four most common elements found in living organisms? (a) Hydrogen
(b) Carbon
(c) Sulphur
(d) Nitrogen
A element that does not belong to the four elements that are most frequently found in living things is sulfur.
What do you mean by element?A fundamental object that is difficult to divide into smaller bits is known as an element. An element is a chemical that cannot be broken by non-nuclear reactions in chemistry or physics. A discrete component of a bigger structure or collection is referred to as an element in computers and mathematics.
What constitutes an element?Each element is made up of atoms which are composed of neutrons, electrons, and neutrons. Two distinct atom types can be combined to form a compound. Although a molecule cannot be distinguished from the larger material, it shares many characteristics with it.
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The colors in this image show topography. The warm colors-red, pink, and yellow- represent landforms above sea level. The greens and blues indicate changes in topography below sea level. Deep in the Atlantic Ocean is an enormous mountain range, longer than any on land, shown here as a linear feature green. What is this underwater mountain range, and why is it almost exactly in the middle of the ocean? With your partner, discuss why you think there is a mountain range deep under the ocean's surface. What do you make of this feature? Record your thoughts below.
The underwater mountain range that is shown in the image is the Mid-Atlantic Ridge. This range runs down the center of the Atlantic Ocean, and is a part of the global mid-ocean ridge system.
The Mid-Atlantic Ridge is a divergent plate boundary, which means that it is an area where two tectonic plates are moving away from each other. As the plates move apart, magma from the Earth's mantle rises to the surface and cools, forming new crust. This process of seafloor spreading is what creates the underwater mountain range.
What is the Mid-Atlantic Ridge about?One possible explanation for the location of the Mid-Atlantic Ridge in the middle of the ocean is that it is a response to the convective motion of the Earth's mantle. The mantle is made up of hot, dense rock that is constantly moving around.
Another possible explanation is that the Mid-Atlantic Ridge is the result of past tectonic activity. The Atlantic Ocean was formed by the separation of the supercontinent Pangea into two parts, Laurasia and Gondwana. The ridge is a remnant of the rift that separated these two supercontinents.
In all, the Mid-Atlantic Ridge is a fascinating feature that provides important information about the Earth's geology and tectonic activity. Its location in the middle of the ocean is a reminder of the dynamic nature of our planet, and the ongoing process of seafloor spreading that is constantly shaping the Earth's surface.
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draw the structure of the product of this reaction. use the wedge/hash bond tools to indicate stereochemistry where it exists. if there are alternative structures, draw the most stable one. if no reaction occurs, draw the organic starting material.
The E2 elimination reaction of cyclo-alkylhalides are usually stereo selective. Usually trans isomer reacts slowly than cis-isomer. So the elimination reaction in an alkaline potassium hydroxide medium will be 1-methyl cyclohexene.
The reason behind stereo selectivity is because pf the spatial orientation of the substituents on the ring structure. For cyclic compounds this has a great influence to direct a reaction in Regio-selectivity. The transition state between the reactant and product influence in the rate of elimination reaction.
Here the major elimination product is 1-methyl cyclohexene and a minor amount of 3-methyl cyclohexene is also produced.
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(The question is not complete. The complete question is given as an image)
TRUE OR FALSE the number of transporters directly corresponds to the rate at which solutes may diffuse, the more transporters present, the faster the rate of diffusion.
False. The number of transporters present in a cell membrane does not directly correspond to the rate at which solutes may diffuse.
Transporters are proteins that span the cell membrane and actively transport specific molecules across the membrane, against their concentration gradient, using energy from ATP. They do not increase the rate of diffusion of solutes which is passive movement of solutes from high concentration to low concentration areas.
Diffusion rate is determined by several factors, including the concentration gradient of the solute, the permeability of the membrane to the solute, and the temperature. The presence of transporters may affect the overall rate of solute transport across the membrane, but this is not the same as the rate of diffusion.
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If an asteroid created enough dust to block out the Sun, what would be the effect on green plants, as well as other life on Earth? Why?
If an asteroid created enough dust to block out the Sun, it would likely have a severe and devastating effect on life on Earth.
Green plants, which rely on sunlight for photosynthesis, would not be able to produce the energy they need to survive, leading to mass die-offs of vegetation. This would in turn have a cascading effect on the entire ecosystem, as animals that depend on plants for food would also struggle to survive. The lack of sunlight would also cause a decrease in temperature, which can have a negative impact on many organisms.
The lack of sunlight would also have a severe impact on the climate and weather patterns, leading to a "nuclear winter" scenario, where the temperature drops significantly, leading to the extinction of many species, including the human species, who rely on the food chain.
The free-energy change, ΔG, for the chemical reaction A → B is 0 kcal/mole at 37°C when the concentrations of A and B are 10 M and 0.1 M, respectively. What is the free-energy change for the reaction when the concentrations of A and B are 0.01 M and 1 M, respectively?
The free energy change for the same reaction when the concentrations of A and B are 0.01 M and 1 M, respectively, is -2.501 kJ/mol.
The free energy change, ΔG, for the chemical reaction A → B is determined by the equation ΔG = -RT ln(K), where R is the gas constant, T is the temperature, and K is the equilibrium constant.
Because the temperature of the reaction is held constant, the ΔG will remain the same no matter what the concentrations of A and B are.
To calculate the free energy change for the reaction when the concentrations of A and B are 0.01 M and 1 M, respectively, we need to calculate the new equilibrium constant, K.
K is equal to the product of the concentrations divided by the reactants. For this reaction, K = (1 M)(0.01 M)/(10 M) = 0.001.
Plugging this value of K into the equation for ΔG,we get
ΔG = -RT ln(K) = -(8.314 J/K mol)(310 K) ln(0.001) = -2.501 kJ/mol.
This is the free energy change for the reaction when the concentrations of A and B are 0.01 M and 1 M, respectively.
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the value of the equilibrium constant k is a measure of how far the reaction proceeds toward the products at a given temperature. a small value of k indicates that the reaction favors the , whereas a large value of k indicates that the will be present in a higher proportion. multiple choice question.
The fill in the blanks is as follows :
a) Reactants
b) Products
The value of the equilibrium constant k is the measure of how far will the reaction proceeds toward produce the products at a temperature.
a) A small value of k indicates that the reaction will favors the reactants.
b) Whereas a large value of k indicates that the "product" will be present in the higher proportion.
The equilibrium reaction is the state of the reaction where the rate of the forward reaction is equals to the rate of the backward reaction. The rate of the forward reaction is equals to the rate of the backward reaction.
This question is incomplete , the complete question is :
The value of the equilibrium constant k is a measure of how far the reaction proceeds toward the products at a given temperature. a small value of k indicates that the reaction favors the , whereas a large value of k indicates that the will be present in a higher proportion. multiple choice question.
a) Reactant
b) Product
c) Both reactant and product
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given that the molecular weight of naturally occurring oxygen is 15.99938 amu, and the following table, compute the molecular weights of
The natural abundance of 36Ar is 0.337%, and its molecular weight is 35.96755 amu. The natural abundance of 38Ar is 0.063%, and its molecular weight is 37.96272 amu. The natural abundance of 40Ar is
The total atomic weight of every atom in a substance's molecule is that substance's molecular weight. Common units of measurement include atomic mass units (amu) and daltons (Da). The number of atoms of each element present in a molecule is multiplied by the atomic weight of that element, and the sum of all these values is used to determine the substance's molecular weight. An essential physical characteristic that may be utilised to identify a material and forecast how it will behave in chemical reactions is its molecular weight. The molar concentration of a solution is calculated, the amount of a drug contained in a sample is determined, and many more practical applications are also employed.
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Consider the composition. information from the SDS. What is a possible name of this compound?
A. Glycine
B. Glycogen
C. Glycerol
The compound that we have in the SDS is glycerol.
What is the SDS?We know that the SDS is the acronym that stands for the safety data sheet. This is the kind of sheet that tells us about the properties of a substance and any other safety information that we might need.
From the information, we can see that compound is not flammable and that it does not vaporize quite easily thus it is quite safe and this would correspond to glycerol. This corresponds to the safety data sheet that we have.
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I need help on 9, 10, 11, and 12
The limiting reactant and excess reactant can be determined by a concept known as the Law of Conservation of Mass.
The limiting reactant and excess reactantLimiting Reactant: H2O, Excess Reactant: O2Limiting Reactant: Mg(OH)2, Excess Reactant: HCILimiting Reactant: Fe2O3, Excess Reactant: ZnLimiting Reactant: CuSO4, Excess Reactant: AgNO3This law states that matter can neither be created nor destroyed. Therefore, the amount of each reactant must be equal to the amount of each product. By looking at the chemical equation and the amount of each reactant, the limiting reactant is the one that is used up first and therefore determines the amount of products that can be made. The excess reactant is the one that is left over once the limiting reactant has been exhausted. For example, in problem 9, the equation is 2H2O + O2 →→ 2H2O2 and the amounts are 5 mol H2O and 15 mol O2. Since oxygen is used up first, it is the limiting reactant and hydrogen is the excess reactant. In problem 10, the equation is Mg(OH)2 + 2HCI→→ MgCl2 + 2H2O and the amounts are 6 mol Mg(OH)2 and 20 mol HCI.Since magnesium is used up first, it is the limiting reactant and hydrochloric acid is the excess reactant. In problem 11, the equation is 3Zn + Fe2O3→ 3ZnO + 2Fe and the amounts are 4 mol Zn and 2 mol Fe2O3. Since zinc is used up first, it is the limiting reactant and iron oxide is the excess reactant. In problem 12, the equation is CuSO4 + 2AgNO3 → Cu(NO3)2 + Ag₂SO4 and the amounts are 13 mol CuSO4 and 22 mol AgNO3. Since copper sulfate is used up first, it is the limiting reactant and silver nitrate is the excess reactant.To learn more about The limiting reactant and excess reactant refer to:
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A rocket travels in a straight line at a speed of 5000 m/s. After 1 min, it is 10,000 m/s. What is the rocket's acceleration?
A rocket travels in a straight line at a speed of 5000 m/s. After 1 min, it is 10,000 m/s. 83.33ms⁻² is the rocket's acceleration.
What is an acceleration ?The rate of change of velocity is defined as acceleration. Acceleration usually indicates that the speed is changing, but this is not always the case. When an object moves in a circular path at a constant speed, it is still accelerating because its velocity direction changes.
Vf = Vo + at
Vf = Final velocity
Vo = Initial Velocity
a = acceleration
t = time required
Making "a" the subject
a = Vf - Vo/(t)
a = 10,000–5,000/(60)
a = 5,000/60
a = 83.33ms⁻²
Thus, 83.33ms⁻² is the rocket's acceleration.
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consider a sample containing 1 mol of an ideal gas in a flexible, closed container. what of the changes will cause the volume to decrease?
A sample containing 1 mol of an ideal gas in a flexible, closed container. The changes will cause the volume to decrease is :
1) To decrease the temperature and the increase in pressure.
2) Temp decreases and pressure remains constant.
The ideal gas equation is as follows :
P V = n R T
Number of moles = 1 mol
n = 1
V = R T / P
The temperature is directly proportional to the volume and the pressure is inversely proportional to the volume.
So, the conditions that will decreases the volume are :
1) To decrease the temperature and the increase in pressure.
2) Temp decreases and pressure remains constant.
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A block of aluminum occupies a volume of 10mL and has a mass of 40 g.
What is its density? (D = M/V)
Density of a block of aluminum occupies a volume of 10mL and has a mass of 40 g is 4g/ml.
Define density.
A material's density is determined by how closely it is packed. As the mass per unit volume, it has that definition. The relationship between density and volume and mass is inverse.
The density rises if the volume remains constant while the amount of matter increases. Density drops when volume grows without accompanying increases in mass. When a substance is heated, the molecules move faster and slightly farther apart, taking up more space and causing the density to drop. When something is cooled, the molecules slow down and get a little closer together, taking up less space and becoming denser.
D = M/V
Mass, M is 40 g.
Volume, V of 10mL
Density, D will be 40/10 i.e. 4g/ml.
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