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3 years ago

Which statement is true of a chemical change?

2 answers:

5 0

The appropriate answer is a. it involves a change in the molecular structure of the substance. A change in phase or state is referred to as a physical change. For example...liquid water freezing is a physical change because the state changes but solid water is still H20. Separating water into its constituent atoms, hydrogen and oxygen is a chemical change because the molecular structure of water is now non existent.

tatiyna3 years ago

4 0

The answer is c. There wouldnt be a process or a change to it

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How much volume (in cm^3)is gained by a person who gains 11.8 lb of our fat? Human fat has a density of 0.918 g/cm^3

Zinaida [17]

The volume (in cm³) gained by a person who gains 11.8 lb of fat is 5830.49 cm³

<h3>What is density? </h3>

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

<h3>How to convert pounds to grams </h3>

1 lb = 453.592 g

Therefore,

11.8 lb = 11.8 × 453.592

11.8 lb = 5352.3856 g

<h3>How to determine the volume </h3>

Mass = 5352.3856 g
Density = 0.918 g/cm³
Volume =?

Volume = mass / density

Volume = 5352.3856 / 0.918

Volume = 5830.49 cm³

Learn more about density:

brainly.com/question/952755

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2 years ago

Choose the correct answer to complete the paragraph about the acceptance of the heliocentric model. In the second century BCE, t

PtichkaEL [24]

Answer:epicycles,copermicus, earth

Explanation:

4 0

3 years ago

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This circuit shows a battery and wires connected to a lightbulb. The chemical energy in the battery is converted to:

____ [38]

Answer:

B. electric energy then chemical energy

Explanation:

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2 years ago

Gaseous methanol (CH4O) reacts with oxygen gas to produce carbon dioxide gas and liquid water. Balanced the equation using the l

NikAS [45]

Answer:

The sum of the coefficients in the balanced equation is 11

Explanation:

A reaction where an organic compound reacts with oxygen to produce carbon dioxide and water is called combustion.

The balance reaction of combustion for methanol is:

2CH₃OH (l) + 3O₂(g) → 2CO₂(g) + 4H₂O (g)

Coefficients from stoichiometry are 2, 3, 2 and 4

Sum = 2 + 3 + 2 + 4 = 11

4 0

3 years ago

Sodium has an atomic number of 11 and has a net charge of 0. When sodium combines with chlorine, it has a net charge of +1. Why?

Mamont248 [21]

Answer: Option (A) is the correct answer.

Explanation:

Atomic number of sodium is 11 and its electronic configuration is $1s^{2}2s^{2}2p^{6}3s^{1}$ .

In order to gain stability, sodium loses one electron and hence it forms a positive ion $(Na^{+})$ .

Thus, we can conclude that when sodium combines with chlorine, it has a net charge of +1 because sodium loses a negative electron when forming chemical bonds.

5 0

3 years ago

Read 2 more answers