Answer:
boron is the right answer I have studied
what affect does temputure has on solid
Answer:
As the temperature of a solid, liquid or gas increases, the particles move more rapidly. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid. If a liquid is heated sufficiently, it forms a gas.
Mixtures that have the same composition throughout are ________.
If the human body contains 5.4 L of blood, how many grams of glucose are present in the blood if the concentration is 130. mg/100. mL?
Answer:
good luck
Explanation:
why do atoms separate in molecules
Answer:
Atoms form chemical bonds with other atoms when there's an electrostatic attraction between them. This attraction results from the properties and characteristics of the atoms' outermost electrons, which are known as valence electrons.
9.Ammonium nitrate (NH4NO3) can decompose to form gaseous water, nitrogen, and oxygen. What is the sum of the coefficients in the balanced chemical equation
Answer:
the sum of the coefficients in the balanced chemical equation is 9
Explanation:
The computation of the sum of the coefficients in the balanced chemical equation is shown below:
here is the balanced chemical equation
[tex]2NH_4NO_3 \rightarrow 4H_2O)g) + 2N_2(g) + 1O_2(g)[/tex]
Now the sum is
= 2 + 4 + 2 + 1
= 9
hence, the sum of the coefficients in the balanced chemical equation is 9
and, the same is to be considered
Which task most likely involves a calculation that uses moles?
measuring a sugar sample on a balance
counting the number of jellybeans in a jar
determining the number of atoms in a jar of liquid
finding the rate of expansion of a gas-filled balloon
Answer:
determining the number of atoms in a jar of liquid
Explanation:
In determining the number of atoms that makes up a substance, the number of moles is very essential.
The mole is the convenient unit of quantity of particles. It can be likened to a quantity of things in everyday life like a dozen, a score and a gross.
A mole of any substance contains 6.02 x 10²³ particles These particles can be atoms, protons, neutrons, electrons etc.So, to find the number of atoms, we must know the number of moles.
Answer:
3rd choice
Explanation:
I got it correct
What does the group number plus number of bonds equal?
It’s talking about the periodic table
Answer:
A stable compound with a complete octet or electronic configuration
Explanation:
The Periodic table is the arrangements of chemical elements in horizontal rows (called 'Periods') and vertical columns (called 'Groups') based on their various physical and chemical properties.
Elements in the same group have a common quality being that they have the same number of free (valent) electrons in their outermost shell. For example, elements in group 1 all have one valent electron in the outermost shell as compared to elements in group 5 which have five valent electrons in the outermost shell. Therefore the group number tells us the number of valence electrons of all the elements in that group.
Meanwhile, elements in the same period have the same number of outermost shell but an increasing number of valence electrons as one goes across the period from left to right.
Elements form chemical bonds in an effort to achieve chemical stability. Chemical stability is achieved when the shells of the elements are fully filled with electrons and achieved a stable electronic configuration of 2 or 8.
The type of bonds formed depend on the number of valence electrons available for bonding in the outermost shell of the element.
So the element Oxygen for example which has 6 valence electrons, in its outermost shell tends to form covalent bonds (a bond achieved by sharing electrons). It is easier for oxygen to form a covalent bond by sharing its valence electrons with another element than to lose all six valence electrons in order to achieve a stable octet state
The element Chlorine (Cl, with seven valence electrons) on the other hand tends to form electrovalent or ionic bonds by accepting an electron from a metal element like Sodium (Na) to achieve a complete octet. It is easier for Cl to achieve a stable octet state by accepting an electron than losing all 7 valence electrons.
Therefore, the group number (an indicator of the number of valence electrons in the outermost shell) plus the number of bonds formed equals a stable atom or compound with a complete electronic configuration.
Calculate the number of atoms present in .20 moles of H20.
Answer:
20 moles = (96.7+)
345%20 moles inter = h20
h2+345%20 moles
kalkadanc = jani+CARSORI
564 MOLES
Explanation
we have to plus the moles that we can get the answer and u should now the formula of kalkadanc and just % will get to the correct answer.
i think u may understand and this is the correct answer i had practice this too much
Which of the following is not made up of atoms?
A. elements
B. molecules
C.
pure substances
D. subatomic particles
The sub-atomic particles are not made up of atoms, they have their own identity.
What are sub-atomic particles?Sub -atomic particles are defined as particles which compose an atom. A sub -atomic particle can be a composite particle composed of other particles or an elementary particle which is not composed of other particles.
The elementary particles are six flavors of quarks , six types of leptons and twelve gauge Bosons .All sub atomic particles have an electric charge which is an integer multiple of elementary charge.They are in smaller in size as compared to atoms.
The three fundamental sub-atomic particles are electrons , protons and neutrons . The smallest known sub-atomic particles to exist are called quarks. Neutrons and protons are the sub-atomic particles which reside in the nucleus and are together called as nucleons.
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Conduction is the transfer of heat in?
gases
liquids
solids
Answer:
solids
Explanation:
What is the relationship between temperature and pressure
all energy travels in waves true or false
What volume of a 0.311 M hydrochloric acid solution is required to neutralize 13.9 mL of a 0.110 M potassium hydroxide solution?
Answer:
4.9 mL
Explanation:
To answer this question we will use the following equation:
C₁V₁=C₂V₂Where the subscript 1 refers to hydrochloric acid, while 2 refers to potassium hydroxide. Meaning:
C₁ = 0.311 MV₁ = ?C₂ = 0.110 MV₂ = 13.9 mLSo we solve for V₁:
0.311 M * V₁= 0.110 M * 13.9 mL V₁ = 4.9 mL4. Question: What effect does the amount of light have on plant growth?
A student makes a saturated sugar solution by dissolving sugar grains in warm water stirring and adding more sugar until it no longer dissolves the student then allows the solution to come to room temperature the student pours equal volumes of sugar solution into five Beakers the student places a string into each of the beakers with one end of the string hanging free outside of the glassware the student then places the bigger the five chambers of varying temperatures 5,10,15,20 and 25°C for two weeks at the end of the experiment a student student noticed crystals have formed in the string the student masses the amount of crystals that formed from the sugar solution on the string select the dependent variable in this experiment what process in the rock cycle the student is most likely modeling
Answer:
The answer is A
Explanation:
A student who performed the Benedict tests on potatoes is the subject of a case study. Benedict Regent's flavor is the first thing that comes to mind. Benedict's solution is used to complete Benedict's test.
What sugars by dissolving sugar grains in warm water?With the aid of a potato, the kids tasted. To do the test, she utilized potato and Benedict solution. When Benedict solution is present, the color is a vivid crimson orange, however after the student's taste, complicated sugar does not.
There is no need to display a vivid orange or red color in Benedict's answer. The pupil was holding a potato. The brilliant orange color in the solution was displayed as a result. The two sugars' inclusion is what gives the mixture its hue.
An experiment should have two distinct controls. A positive control should be one, and a negative control should be the other.
Therefore, The one who oversees positive controls is called a positive control.
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What is the Atomic number of 12
Answer:
atomic number of 12 is MG
Explanation:
Magnesium
For many purposes we can treat butane (C4H10) as an ideal gas at temperatures above its boiling point of - 1. °C.
Suppose the pressure on a 3.0 m3 sample of butane gas at 19.0°C is reduced to one-third its initial value.
Is it possible to change the temperature of the butane at the same time such that
the volume of the gas doesn't change?
If you answered yes, calculate the new temperature of the gas. Round your
answer to the nearest °C.
Answer:
A. Yes
B. –176 °C
Explanation:
A. Yes
B. Determination of the new temperature of the gas.
Let the initial pressure be P
From the question given above, the following data were obtained.
Initial pressure (P1) = P
Initial temperature (T1) = 19 °C
Final pressure (P2) = ⅓ P1 = ⅓P = P/3
Final temperature (T2) =?
Next, we shall convert 19 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T1) = 19 °C
Initial temperature (T1) = 19 °C + 273
Initial temperature (T1) = 292 K
Since the volume is constant, we can obtain the new temperature of the gas as illustrated below:
Initial pressure (P1) = P
Initial temperature (T1) = 292 K
Final pressure (P2) = P/3
Final temperature (T2) =?
P1/T1 = P2/T2
P/292 = P/3 /T2
P/292 = P/3T2
Cross multiply
P × 3T2 = 292 × P
Divide both side by P
3T2 = (292 × P)/P
3T2 = 292
Divide both side by 3
T2 = 292/3
T2 = 97.33 ≈ 97 K
Finally, we shall convert 97 K to celcius temperature. This can be obtained as follow:
T(°C) = T(K) – 273
T(K) = 97
T(°C) = 97 – 273
T(°C) = –176 °C
Thus, the new temperature of the gas is –176 °C.
The temperature of the butane can be changed when the pressure has been reduced to one-third of the initial temperature. The final temperature of the gas will be -176 [tex]\rm ^\circ C[/tex].
When the pressure of butane has been reduced to one-third of the initial pressure, it has been possible to change the temperature as well. This is because the gas will follow the ideal gas equation and will be able to change pressure and temperature as they are directly proportional to each other.
The new temperature can be given by:
Initial pressure = P
Final pressure = [tex]\rm \dfrac{P}{3}[/tex]
Initial temperature = 19 [tex]\rm ^\circ C[/tex]
Initial temperature = 292 K
When the volume is kept constant, the relationship of the pressure and temperature can be given by:
[tex]\rm \dfrac{P1}{T1}\;=\;\dfrac{P2}{T2}[/tex]
Where P1 and T1 are initial pressure and temperature respectively. P2 and T2 are the final pressure and temperature respectively.
[tex]\rm \dfrac{P}{292}\;=\;\dfrac{P}{3T2}[/tex]
P [tex]\times[/tex] 3T2 = P [tex]\times[/tex] 292
3T2 = 292 K
T2 = 97.33 K
The final temperature of butane with the decrease of one-third of pressure has been 97.33 K.
273 K = 1 [tex]\rm ^\circ C[/tex]
97.33 K = -176 [tex]\rm ^\circ C[/tex]
The final temperature of butane with the decrease of one-third of pressure has been -176 [tex]\rm ^\circ C[/tex].
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How do molecules of air in direct contact with Earth's solid, warm surface absorb heat energy?
A conduction
B condensation
C. convection
D. diffusion
Answer:
actually its c convection.
Explanation:
my teacher asked the same question but with diffrent oppstions.
and diffusion is DEFINATALY not the answer. its convection.
Molecules of air in direct contact with Earth's solid, warm surface absorb heat energy with conduction.
What is conduction ?The process by which heat is transmitted from an object's hotter end to its cooler end is known as conduction. The term "thermal conductivity" refers to an object's capacity to transfer heat, and it is represented by the letter k. Along a temperature gradient, heat flows naturally.
When two materials or objects come into direct touch with one another, conduction takes place. More quickly than in a cooler item, the molecules in a warmer one vibrate. The slower molecules clash with the faster vibrating molecules.
Ground-level heat is radiated into the lower atmosphere. In conduction, heat is transferred directly from hotter regions to cooler ones. Warmer molecules bounce vigorously and clash with molecules close by, exchanging energy.
Thus, option A is correct.
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The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group?
Characteristics of a group of elements
•is shiny
•is solid at room temperature
•has atoms with two valence electrons
A-silicone
B-lithium
C-strontium
D-aluminum
Answer:
C:Strontium
Explanation:
What is an example of a gas in motion and a fluid in motion?
Answer:
Gas in motion : Vaporization
Examples of fluid flow :
A river flowing down a mountainAir passing over a bird's wingBlood moving through a circulatory systemFuel moving through an engine.Explanation:
When is a chemical equation considered balanced
Answer:
If each side of the equation has the same number of atoms of a given element, that element is balanced. If all elements are balanced, the equation is balanced.
Explanation:
Pablo and Charles were conducting an investigation where they were measuring the energy of a glass marble as it rolled down a ramp. According to their calculations, the total energy of the marble decreased.
Which statement below is the best explanation for the decrease in total energy?
a.The energy decreased because it was destroyed by the interaction with the ramp.
b. The total amount of energy always decreases in an energy conversion and is expected.
c. The scientists’ calculations were incorrect; the energy totals should have been the same.
d. The energy decreased because heat resulted from the friction between the marble and the ramp.
Answer:
c. The scientists’ calculations were incorrect; the energy totals should have been the same.
Explanation:
We must remember that energy can not be created nor destroyed according to the law of conservation of mechanical energy.
The total energy of a body remains a constant throughout its motion. For a body rolling down a ramp, the energy changes from potential to kinetic + potential and then to kinetic.
In all of these stages of its motion, the total energy of the glass marble remains constant.
Answer:
b
Explanation:
b
in the following chemical reaction between H_2 and Cl_2 to produce HCl, what is the sum of the mass of HCl produced plus the mass of left over reactants when 0.40 g of H_2 completely reacts with 12.35 g of Cl_2?
H_2(g) + Cl_2(g) → 2HCl(g)
Answer:
Left over mass of hydrogen = 0.06 g
Mass of HCl produced = 12.41 g
Explanation:
Given data:
Mass of H₂ = 0.40 g
Mass of Cl₂ = 12.35 g
Mass of left over reactant = ?
Mass of HCl produced = ?
Solution:
Chemical equation:
H₂ + Cl₂ → 2HCl
Number of moles of H₂:
Number of moles = mass / molar mass
Number of moles = 0.40 g/ 2 g/mol
Number of moles = 0.2 mol
Number of moles of Cl₂:
Number of moles = mass / molar mass
Number of moles = 12.35 g/ 71 g/mol
Number of moles = 0.17 mol
Now we will compare the moles of HCl with H₂ and Cl₂.
H₂ : HCl
1 : 2
0.2 : 2×0.2 = 0.4
Cl₂ : HCl
1 : 2
0.17 : 2 × 0.17 = 0.34
Chlorine is limiting reactant.
Mass of HCl produced:
Mass = number of moles × molar mass
Mass = 0.34 mol × 36.5 g/mol
Mass = 12.41 g
Leftover mass of hydrogen:
Cl₂ : H₂
1 : 1
0.17 : 0.17
Number of moles of H₂ react with Cl₂ are 0.17.
Moles remain unreacted = 0.2 - 0.17 = 0.03 mol
Mass left over:
Mass = number of moles × molar mass
Mass = 0.03 mol × 2 g/mol
Mass = 0.06 g
The sum of the mass of HCl produced plus the mass of left over reactants is:
Mass of hydrogen = 0.06 g
Mass of HCl = 12.41 g
Chemical ReactionGiven:
Mass of H₂ = 0.40 g
Mass of Cl₂ = 12.35 g
Mass of left over reactant = ?
Mass of HCl produced = ?
Chemical equation: H₂ + Cl₂ → 2HClNumber of moles of H₂:
Number of moles = mass / molar mass
Number of moles = 0.40 g/ 2 g/mol
Number of moles = 0.2 mol
Number of moles of Cl₂:
Number of moles = mass / molar mass
Number of moles = 12.35 g/ 71 g/mol
Number of moles = 0.17 mol
The moles of HCl with H₂ and Cl₂.
H₂ : HCl
1 : 2
0.2 : 2×0.2 = 0.4
Cl₂ : HCl
1 : 2
0.17 : 2 × 0.17 = 0.34
The chlorine is limiting reactant.
Mass of HCl produced:
Mass = number of moles × molar mass
Mass = 0.34 mol × 36.5 g/mol
Mass = 12.41 g
Leftover mass of hydrogen:
Cl₂ : H₂
1 : 1
0.17 : 0.17
Number of moles of H₂ react with Cl₂ are 0.17.
Moles remain unreacted = 0.2 - 0.17 = 0.03 mol
Mass left over:
Mass = number of moles × molar massMass = 0.03 mol × 2 g/molMass = 0.06 gLearn more about "Moles":
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What is the formula mass for (NH4)2C2O4
Answer:
124.1 g/mol
Explanation:
just facts
Answer:
124.1 g/mol
Explanation:
To calculate formula mass, multiply the subscript of each element in the formula by the element's atomic weight (relative atomic mass) found on the periodic table. The unit for formula mass is either u or Da (Daltons).
true or false???????????
Answer:
false
Explanation:
longer the wave length less frequency
Which energy transformation produces electricity and is least likely to negatively impact the environment?
Generating electricity from a natural gas-fired power plant
Generating electricity from a natural gas-fired power plant
Generating electricity from a coal-fired power plant
Generating electricity from a coal-fired power plant
Generating electricity from a nuclear power plant
Generating electricity from a nuclear power plant
Generating electricity from a solar panel system
Generating electricity from a solar panel system
electricity from solar panels
Explanation:
All other options produce something after or during the time electricity is made. That something is gas. Not solar
If you 0.123 moles of CO2 is placed at 300.1 K and 2.91 atm pressure. Determine its volume.
show with work
Answer:
1.04 L
Explanation:
Salt is water solution is made salt or water
Answer:
Both
Explanation:
because salt water comes from water mixing with salt
What element has 2 occupied principals of energy levels
Which list of elements consists of metalloids, only?
A) B, Al, Ga
B) C, N, P
C) O, S, Se
D) Si, Ge, As
Answer: D
Explanation: Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te) and, Astatine (At) are all metalloids
The study of chemicals is called chemistry.
The correct answer is D.
Metalloids are defined as an element which has both the property of metals and nonmetals.
Metalloids have the tendency to lose electrons and gain electrons to achieve stability.
The number of elements present in the metalloids is very few.
Hence, The correct answer is D that is Si, Ge, As.
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