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labwork [276]
3 years ago
8

Which phrase most accurately describes a chemical change?

Chemistry
1 answer:
Mariulka [41]3 years ago
5 0
The signs of a chemical reaction include
Production of a gas (bubbles)
Production of heat
Production of light
Color change
Production of a solid (precipitate) in a solution

So from those answers we see that A is the correct answer.
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The function of this organelle is to create energy (ATP) through the process of cellular respiration.
dedylja [7]

Answer:

C

Explanation:

I hope this is correct and have a great day

3 0
3 years ago
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Which is an example of a pure substance? A. coffee B. helium C. vinegar D. trail mix
bogdanovich [222]

B. Helium

It has only He atoms

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3 years ago
Hydroxyl radicals react with and eliminate many atmospheric pollutants. However, the hydroxyl radical does not clean up everythi
Nesterboy [21]

Answer:

ΔHreaction = 263.15 kJ/mol

Explanation:

The reaction is as follow:

OH + CF₂Cl₂ → HOF + CFCl₂

You need to calculate the enthalpy of reaction and for this it is necessary to know the standard enthalpies for each of the compounds. These enthalpies are as follows and can be found in your textbook or on the Internet.

ΔHreaction = ∑ΔHproducts - ∑ΔHreactants

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7 0
3 years ago
A neutral isotope has a mass number of 65 and 36 neutrons. Identify the element symbol of this isotope and determine the number
ValentinkaMS [17]

Answer:

Is an isotope of Cu (Copper)

Explanation:

Remember that the mass number will tell you the number of protons and neutrons. If you have the mass number(65) and the number of neutrons (36), you just need to subtract: 65 - 36 = 29 the number or protons.

As this is a neutral isotope, that means that is going to have the same number of protons and electrons, that is 29.

7 0
3 years ago
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How much heat is required to convert 90. g of ice at -4.0 C to water vapor (steam) at 110 C
lakkis [162]

Answer:  How much heat is required to convert 29 g of ice at -4.0 ˚C to water vapor at 105 ˚C (report your answer to three significant figures)? Answer all five parts, showing your detailed calculations: i) Heat to warm ice from -4.0 to 0 oC: ii) Heat to convert ice to liquid: iii) Heat to warm liquid to boiling: iv) Heat to convert liquid to gas

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Explanation:

e

6 0
2 years ago
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