Answer:
Explanation:
Let the number of moles of water in the required formula be "y".
The final formula should be in the form of : CoCl2 yH2O
1.62 g is the weight of CoCl2 and water in the sample
After heating, the remaining mass represents the mass the salt only
mass of water in sample = 1.62 - 0.88 = 0.74 g
From the periodic table:
molar mass of cobalt is 59 g
molar mass of chlorine is 35.5
molar mass of hydrogen is 1
molar mass of oxygen is 16
molar mass of formula = 59 + 2(35.5) + 18y = 130 + 18y g
Now we have calculate the mass/molar mass for each part of the formula (salt and water) and equate them to get number of moles of water as follows:
0.88 / 130 = 0.74 / y18
y = 6.07 which is approximately 6 moles
Thus, the final formula is CoCl2 6H2O. This hydrate is called cobalt(II)chloride hexahydrate.
give brainliest.
Please solve for the mass and explain your answer to this problem.(I just dont understand it) : (
PLs help pls does anyone know this pls
Answer:
A graph, luminosity, temperature, decreases
Explanation:
:)
Select the word that means how easily water can move through a substance.
sediment
porosity
particles
permeability
If equal volumes of the four acids at a concentration of 0.50 M are each titrated with a strong base, which will require the greatest volume of base to reach the equivalence point
The four acids will require the same volume of the base to reach the equivalence point.
Acid-base titrationStrong acids completely ionize in waters while weak acids are only partially ionized in waters.
At 0.5 M concentration, the hydrogen ion concentrations of all four acids would be the same.
This means that each of the acids will require an equal volume of base concentration in order to get neutralized.
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What is the new volume of 513 mL of gas when the pressure changes from 753 torr to 982 torr? It is not necessary to convert torr to atm and assume a constant temperature.
Answer:
393 mL
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Because only pressure and volume are changing and everything else remains constant, we have that:
[tex]\displaystyle P_1V_1 = k = P_2V_2[/tex]
Where k is some constant.
Hence, substitute and solve:
[tex]\displaystyle \displaystyle \begin{aligned} (753\text{ torr})(513\text{ mL}) & = (982\text{ torr})V_2 \\ \\ V_2 & = 393\text{ mL} \end{aligned}[/tex]
Hence, the new volume is 393 mL.
Check: because volume decreases with an increase in pressure, our answer fits within the context of the problem.
Which type of heat transfer
does not require a medium?
A. Conduction
B. Convection
C. Radiation
Answer:
radiation
Explanation:
radiation transfers heat through electromagnetic waves and can transfer heat with or without a medium
Some chemical compounds are listed in the first column of the table below. Each compound is soluble in water. Imagine that a few tenths of a mole of each compound is dissolved in a liter of water. The important chemical species that would be present in this solution are written in the second column of the table. Use the checkboxes to classify each compound.
Ionic substances produce ions in solution while molecular substances produce molecules in solution.
What is a solution?A solution is a combination of solute and solvent. The species that occur in solution depends on the type of substance that was dissolved. Since the table is not shown, we do not know exactly what compounds were dissolved in solution.
Generally, if an ionic substance is dissolved in solutions that ions are present in the solution. If a molecular substance is dissolved in solution, molecules are present in solution.
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The polarity of a bond between two elements can be best determined by:.
What is oxidation?
releases energy from meat products for us to use
releases energy from the food for us to use
releases energy from the sun
releases energy from photosynthesis
Answer:
releases energy from the food for us to use
Explanation:
What is h2o? I’m in 1st grade
Answer:
Water
Explanation:
H20 means
H = Hydrogen
2 = 2 Hydrogen atoms
O = Oxygen (1 atom)
Thanks!
Mark me brainliest!
Answer:
H20 is water (I wondered this question too in first grade) (sorry if I am wrong)
Why did Tim conclude that all matter is mostly made of empty space?
Tim conclude that all matter is mostly made of empty space due to presence of all mass in the nucleus.
How atom has mostly empty spaces?An atom is mostly empty space because of its composition. The nucleus, which contains the protons and neutrons indicates the mass of the atom whereas the electrons are revolving around nucleus and there is nothing between orbits.
So we can conclude that all matter is mostly made of empty space due to presence of all mass in the nucleus.
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An object has a mass of 10 grams and a volume of 5cm3 what is the density of the object?
Answer:
.0002
Explanation:
If you had 1.00 kg of each kind of hardware, how many boxes of each would you
have?
The number of boxes is calculated by dividing the
total mass of hardware boxes by 1.00 kg
What is a hardware?A hardware is a physical component of a system that can be touched and felt.
Because hardware are physical components, they always have a given mass.
Assuming, several hardware each of mass 1.00 kg is available to be chosen from.
Also, assuming that the sum total of the mass of all the hardware is known.
The number of boxes can be calculated as follows:
total mass of hardware/1.00 kgTherefore, the number of boxes is obtained by dividing the sum of the mass of the boxes by 1.00 kg.
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What are some things that you have been finding your identity in that you need to
replace with who God says that you are?
Answer: hatred and holes
Explanation: this basically is saying that you need to put god first and not let your hate grow or fester inside of you. By filling your holes(from tragic or life changing events) with god, instead of hate or anger, you are giving your life a better outcome.2 Corinthians 1:20 is implying that you need to put your faith in god and believe in him, if you do this, than anything is possible because your spirit is filled with his love and grace.
hope this helps
Please give brainliest
Thank you so much
Lily is doing a science experiment with a substance in a sealed jar. At first, the substance’s molecules are moving around each other. What will happen to Lily’s substance if she transfers energy into the substance and causes a phase change?
Explanation:
The molecules will be more separated, and will have least amount of intermolecular force of attraction. the substance's molecules will move faster and the substance will be a gas
The diagram below shows the structures of a plant cell. What is structure 1, and how does it help sustain life? A. Structure 1 is a vacuole, which temporarily stores wastes. B. Structure 1 is the cell wall, which provides structural support for the cell. C. Structure 1 is the nucleus, which is the control center of the cell. D. Structure 1 is a chloroplast, which is the site of photosynthesis.
From the diagram, structure 1 would be the chloroplast and it represents the site of photosynthesis.
Plant cellsThe image (see attached) is that of a plant cell and structure labeled 1 is the chloroplast.
The chloroplast of plant cells acts as the site of photosynthesis where inorganic materials are used to synthesize carbohydrates.
Plants generally serve as producers in food chains and thus, chloroplast helps sustain life.
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Answer:
D Structure 1 is a chloroplast which is the site of photosynthesis.
Explanation:
I got it correct on my test
Which of the following examples best represent the levels of organization from least to most complex in humans
4) The equation of the titration reaction between potassium permanganate
and ferrous sulfate is:
Answer:
the permanganate is the opposite of potassiumation:
Explanation:
What information does the third quantum number of an electron give?
The energy sublevel the electron is in.
The specific orbital the electron is in..
The direction the electron is spinning.
The energy level the electron is occupying.
Answer:
The quantum number that specifies the dirction of the orbital angular momentum of an electron in an atom and indicates the orientation of the subshell in which the electron is located.The third quantum number of an electron gives information about the direction the electron is spinning. Option C. This is further explained below.
What is the third quantum number of an electron?Generally, the three quantum numbers are simply defined by characteristic orbital n,l, and m are integers: 0, 1, 2, 3, and so on. The primary quantum number must not be 0.
Hence, the direction an electron spins is given by the third quantum number. This means that for a person to ascertain the direction of an electron the first property of the atom to consider will be the third quantum number.
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Is this equation completely balanced?
2C8H3 + 2502 → 8C02 + 18H20
Answer:
No, because the number of carbon, hydrogen & oxygen atoms on both sides of the equation are not equal.
Explanation:
For an equation to be completely balanced, there should be equal number of reactants and products.
Number of carbon atoms on reactant side = 16
Number of hydrogen atoms on reactant side = 16
Number of oxygen atoms on reactant side = 50
Number of carbon atoms on product side = 8
Number of hydrogen atoms on product side = 36
Number of oxygen atoms on product side = 34
Therefore, we can conclude that total number of reactants does not equal total number of products therefore, this equation is not completely balanced.
[RevyBreeze]
what is the molar mass of copper sulfate?
[tex]Copper Sulphate : CuSO \tiny{4}[/tex]
Mass of Copper (Cu) :- 63.5Mass of Sulphur (S) :- 32 Mass of Oxygen (O) :- 16ATQ :- mass of Copper Sulphate :- Cu+S+4(O)
[tex]63.5 + 32 + (4 \times 16) \\ 95.5 + 64 = 159.5grams[/tex]
your answer is :- 159.5 grams or appropriately 160 grams
Answer:
The molar mass of copper sulfate would be 159.5 g.
Explanation:
Have a great rest of your day
#TheWizzer
Consider the reaction below. NH4 H2O Right arrow. NH3 H3O Which is an acid-conjugate base pair? NH4 and NH3 NH4 and H3O H2O and NH3 H2O and H3O.
For the given chemical reaction, NH₄ - NH₃ and H₂O - H₃O is the acid - conjugate base pair.
What is acid - conjugate base pair?An acid - conjugate base pair are those pairs which are differ by the only one proton or H⁺ ion.
Given chemical reaction is:
NH₄ + H₂O → NH₃ + H₃O
According to the Bronsted-Lowry theory, acids are those which gives H⁺ ion and bases are those which accept H⁺ ion in the aqueous solution. In the above reaction NH₄ is an acid as it losses H⁺ ion and NH₃ is the conjugate base of NH₄. Similarly, H₂O is a base as it accepts H⁺ ion and H₃O is the conjugate acid of H₂O.
Hence, NH₄ - NH₃ and H₂O - H₃O is the acid - conjugate base pair.
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Answer:
A
Explanation:
A
The body of a 62-year-old is discovered in a dry sauna. In investigating whether he died of natural causes or foul play, Jon needs to ascertain time of death. When he arrived on scene, he finds that the body has not yet undergone rigor mortis. What is MOST important to keep in mind to determine time of death?
1. Heat can accelerate the rate of rigor mortis.
2. Cold can accelerate the rate of rigor mortis.
3. Heat can decrease the rate of rigor mortis.
4. The dryness of the sauna will double the time it takes rigor mortis to set in
Answer:
Heat can accelerate the rate of rigor mortis
Explanation:
Took the test
Heat accelerates the rate of rigor mortis by providing a favorable environment for the bacteria and causing decay. Therefore, option (1) is correct.
What is rigor mortis?Rigor mortis can be described as the third stage of death. Rigor mortis is a recognizable sign of death which is characterized by the stiffening of the limbs caused by chemical changes in the muscles postmortem.
In humans, rigor mortis can take place as soon as 4 hours after death. It typically lasts no longer than 8 hours at room temperature. After death, aerobic respiration ceases, depleting the amount of oxygen used in the making of ATP. ATP is mostly needed to cause the separation of the actin-myosin cross-bridges while the relaxation of the muscle.
When oxygen gas is no longer available, the body can continue to produce ATP through anaerobic glycolysis. When the glycogen is depleted, the ATP diminishes, and the body enters rigor mortis due to unable to break bridges.
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Calculate the amount of heat released when 27.0 g H2O is cooled from a liquid at 314 K to a solid at 263 K. Using the chart below, complete the steps to calculate te overall heat released in the process. Type kn your answers Using 3 digits on the right. ((below))
q1 = ___kJ
q2 = ___kJ
q3 = ___ kJ
q4 = ___kJ
The amount of heat released is 45.89kj.
The process involved in the reaction are
1.H20(314k)
2. H20 in solid form at 263k
Q= [m×Cpl ×Tfinal -Tinitial) + ∆H fussion
Q= amount of heat released = ?
m = mass of water = 27 g
cp(l) = specific heat of liquid water = 4.184 J/gk
Cp(s) = specific heat of solid water = 2.093 J/gk
∆H fussion = enthalpy change for fusion = 40.7 KJ/mole = 40700 J/mole.
Therefore, Q= 27 × 4.184j/gk × (314-2173k) + 40700j + (27g × 2.093j/gk ×273-263k).
Q = 45896.798j
Therefore, 1kj is 1000j
Therefore, the amount of heat released is 45.89kj.
What is Heat of formation?Heat of formation is the amount of heat absorbed or released by a mole of elements during chemical reaction.
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q1 = 4.63
q2 = 61.1
q3 = .565
q4 = -66.3
at 25 C, 1.00 mole of O2 gas was found to occcupya volume of 12.5 L at a pressure of 198 kPa. What is the value of gas constant in L•kPa/ mol•K
Answer:
8.3
Explanation:
What are tissues made up of?
Answer should be:
Cells
Answer:
similar cells and their intercellular material
Explanation:
cells make tissues which make organs
Britannica
A researcher selects three regions X, Y, and Z, and records the types of discharge that enter the regions’ rivers.
Which region(s) should be monitored more closely to avoid potential health issues?
Region Z should be monitored more closely to avoid health issues.
Why region Z should be monitored?Region Z should be monitored more closely to avoid potential health issues because region Z produces waste from chemical plants which are dangerous for our water and environment so we can conclude that Region Z should be monitored more closely in order to avoid health issues.
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Write formula if Ca react with O, S and Cl respectively?
Answer:
Calcium (Ca) reacts with Oxygen (O₂)
2Ca + O₂ → 2CaOCalcium (Ca) reacts with Sulphur (S)
Ca + S → CaSCalcium (Ca) reacts with Chlorine (Cl₂)
Ca + Cl₂ → CaCl₂
-TheUnknownScientist 72
Astronomers have discovered vast differences in stars throught their observations. One theory used to explain these differences is that.
1. the distances between stars are vast
2. stars are at different points in their life cycles
3. earths atmosphere distorts our view of the stars
4. there is to much light pollution on earth to sturdy stars
We can confirm that the most likely reason for astronomers to see differences in the stars they observe is that stars are at different points in their life cycles.
What is the life cycle of a star?Stars are said to have seven phases to their lives, which include them being:
nebulaProtostarMain sequence star.Red giant star.White dwarf.Supernova.Neutron star or black hole.Each of these phases of a star have vastly different characteristics and can explain the differences in the observations made by the astronomers.
Therefore, we can confirm that option 2 is correct in that the differences seen by the astronomers are likely because stars are at different points in their life cycles.
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Which statement shows that petroleum is a mixture?
A Petroleum can be burned as a fuel.
B Petroleum can be separated into fractions by distillation.
C Petroleum is a fossil fuel formed over millions of years.
D Petroleum is a thick, black liquid.
Answer:
petroleum is a fossil fuel formed over millions of years