Which of the following equations has correct formulas and also is a balanced equation?a. CaCO3 - > CaO + CO3
b. 3KCl + HNO3 - > 3HCl + KNO3
c. 2Be + O2 - > 2BeO
d. Mg + O2 - > MgO2

Answers

Answer 1

Answer: The equations that has the correct formulas and also is a balanced equation are:
2Be + O2 - > 2BeO
Mg + O2 - > MgO2
The answer are letters C and D. The rest of teh choices are not balanced chemical equations.

Answer 2

Answer:

this question two answers which is C and D they are balanced to the right tab.

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Jack, an Investigator, wants to prove that a certain suspect was present at the crime scene when the crime was committed. What kind ofevidence should he look for?Jack should look for __________ evidence because the analysis of such evidence can prove whether the person was present when the crimewas being committed. This evidence refers to tiny fragments of material that can be transferred from a human to a human or human to alocation(forensic science question)
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A student blows up a balloon, seals it tightly, and places it in a very cold freezer. After a few hours, the balloon has gotten smaller. Which of the following statements best explains the decrease in the balloon’s volume? the multiple choice a. As the temperature decreases, the molecules gain energy and move closer together, causing the balloon to shrink. b.As the balloon releases energy, the molecules break apart into atoms, causing the balloon to shrink. c.As the temperature decreases, the molecules lose energy and move closer together, causing the balloon to shrink. d.As the balloon absorbs energy, the molecules move more quickly, causing the balloon to shrink.

What is the percent yield of ferrous sulfide if the actual yield is 220.0 g and the theoretical yield is 275.6 g

Answers

To get the percent yield, we will use this formula: ((Actual Yield)/(Theoretical Yield)) * 100% Values given: actual yield is 220.0 g theoretical yield is 275.6 g Now, let us substitute the values given. (220.0 grams)/(275.6 grams) = 0.7983 Then, to get the percentage, multiply the quotient by 100. 0.7983 (100) = 79.83% Among the choices, the most plausible answer is 79.8%

If the actual yield of ferrous sulfide is 220.0 g and its theoretical yield is 275.6 g, the percent yield of ferrous sulfide is 79.8%. Make a proportion. 220.0 g is x percent. 275.6 g is 100%. 220.0 g : x = 275.6 g : 100%. After crossing the products: x = 220.0 g * 100% : 275.6 g = 79.8%

Which of the following types of organelles are most important in providing a cell with energy

Answers

Mitochondria are the most important because they released the energy stored in food

I hope that's help you !

Final answer:

Mitochondria are the organelles that provide a cell with energy through ATP production via cellular respiration.

Explanation:

The organelles that are most important in providing a cell with energy are the mitochondria.

Within the mitochondria, ATP (adenosine triphosphate) is produced, which is the energy currency of the cell.

By undergoing cellular respiration, mitochondria produce ATP through oxidative phosphorylation, generating energy for various cellular processes.

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Which group of atomic models is listed in historical order from the earliest to the most recent?(1) hard-sphere model, wave-mechanical model, electron-shell model
(2) hard-sphere model, electron-shell model, wave-mechanical model
(3) electron-shell model, wave-mechanical model, hard-sphere model
(4) electron-shell model, hard-sphere model, wave-mechanical model

Answers

The group of atomic models that is listed in historical order from the earliest to the most recent hard-sphere model, electron-shell model, wave-mechanical model. The answer is number 2. The rest of the choices do not answer the question above.

Answer:2

Explanation:

HARD SPHERE MODEL

According to Dalton he viewed atoms as tiny, solid balls. His atomic theory had four statements which are:

1. Atoms are tiny, invisible particles.

2.Atoms of one element are all the same.

3.Atoms of different elements are different. 4.Compounds form by combining atoms.

ELECTRON SHELL MODEL

Bohr modified Rutherfords model of the atom by stating that electrons moves around the nucleus in orbit fixed sizes and energies.

WAVE MECHANICAL MODEL

Erwin states that electrons do not move in set path around the nucleus but in waves. He said it is impossible to know the exact point of an electron instead we have clouds of probability called the clouds.

The amount of heat energy Q, used to heat up a substance depends on its mass m its specific heat capacity (s) and the change in temperatureΔTof the substance. Using dimensional method, find the expression for s is ( Given that [S]=[L^2T^-2−K^−1]) is
QmΔT
Q/mΔT
Qm/ΔT
m/QΔT

Answers

Answer:

J/(gK)

Explanation:

The equation for the energy, Q released or gained by a system of mass (m), specific heat capacity (s), and temperature change (ΔT) is given by:

Q = msΔT

Rearrange this to isolate c, the specific heat:

msΔT = Q

s = Q/(mΔT)

Q is energy and is commonly expressed in Joules (J). We'll use this unit, but others such as calorie, kJ, BTU, etc., are possible.

m is the mass and is commonly expressed as grams (g). Other units such as kg and even lbs are possible (but who uses English units in science?) Let's select g.

ΔT is commonly expressed in Centigrade (C) or Kelvin (K). OK, Fahrenheit(F) is also possible, but really? We'll use K here.

Now put these units into the expression for s:

s = Q/(mΔT)

s = J/(gK)

Final answer:

The specific heat capacity of a substance, represented by the symbol 's', can be calculated using the equation s = Q/mΔT, where 'Q' is the heat energy, 'm' is the mass of the substance, and 'ΔT' is the change in temperature.

Explanation:

The specific heat capacity (s) is a property of a substance that determines how much heat energy (Q) it requires to change its temperature (ΔT). Mathematically, Q = msΔT. Therefore to find the expression for s, you should rearrange this equation to solve for s. This gives: s = Q/mΔT.

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Which term defines the amount that a solute can dissolve into a solution? A. solute level
B. solution level
C. solubility level
D. saturation level

Answers

The correct answer for the question that is being presented above is this one: "C. solubility level." The term defines the amount that a solute can dissolve into a solution is called the solubility level. The higher the solubility level, the faster it dissolves.

H e l p,,, ill give brainliest :)