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denis-greek [22]
3 years ago
10

2 When enough heat is added to liquid water, it boils, and bubbles of water vapor rise to the surface and into the air. Which ty

pe of change is this and why? A. a chemical change, because gas is produced B. a chemical change because heat is produced C. a physical change because the identity of the substance changes D. a physical change because the substance changes state.3
4. A sample of aluminum has a volume of 3.0 cm3 and a mass of 8.1 g. Which is the density of aluminum?
A. 2.7 g/cm3
B. 5.1 g
C. 11.l cm3
D. 24.3 g/cm3

I only need two question fast
Chemistry
1 answer:
Molodets [167]3 years ago
6 0

Answer:

In the first paragraph, name a theme of Paul Laurence Dunbar's poem "Sympathy," and explain how it develops, citing specific examples

Explanation:

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How do you find the mass number of an element
sesenic [268]

Answer:

add up the mass of protons and neutrons

Explanation:

8 0
3 years ago
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The _______ of an atom are negatively charged. a. protons b. negatrons c. neutrons d. electrons
PIT_PIT [208]
Protons = +1
negatrons = -1
neutrons = 0
<span>electrons = -1
</span>
<span>negatrons are like positrons and they are subatomic particles and are not present in atoms 
</span>
so electrons are negatively charged and are present in atoms 

hope that helps
7 0
3 years ago
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What is the mass of oxygen in 10.0 grams of water?
skelet666 [1.2K]

Answer:

The answer is 16.00 amu.

7 0
3 years ago
Which of the materials above are mixtures​
madam [21]

Answer:

water and vinegar

:salad

Explanation:

There is two kind of mixture the heterogeneous and homogeneous mixture.Which water and vinegar is the homogeneous and the salad is heterogeneous mixture based on my example above.

7 0
3 years ago
How many grams of CO2 are produced if 2.09 moles of hydrochloric acid are reacted with
Anit [1.1K]

Answer:

The molar mass of CO2 = 44.01 g/mol

Explanation:

Start with 2.09 moles of HCl and convert to moles of CO2 For every 2 moles of HCl used, 1 mole of CO2 is formed.

2.09 mol HCl •(1 mol CO2/2 mol HCl) = 1.045 mol CO2

Now convert moles of CO2 to grams using the molar mass.

1.045 mol CO2 • 44.01 g/mol = 45.99 grams CO2

3 significant figures = 46.0 grams CO2

Hope This Helped

6 0
2 years ago
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