Chemistry A Ess Course Assessment

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that involves the rearrangement of the molecular or ionic structure of a substance, resulting in the formation of new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

How do you calculate the mass of a substance from moles?

Back

To calculate the mass of a substance from moles, use the formula: mass (g) = moles × molar mass (g/mol).

Front

What is the formula for calcium arsenide?

Back

The formula for calcium arsenide is Ca₃As₂.

Tags

NGSS.MS-PS1-1

Front

What happens when KBr is dissolved in water?

Back

When KBr is dissolved in water, K⁺ ions are attracted to the oxygen atom of water, and Br⁻ ions are attracted to the hydrogen atoms of water.

Tags

NGSS.MS-PS1-2

Front

Where are products found in a chemical equation?

Back

Products are found on the right side of a chemical equation.

Front

What is the molar mass of chromium (Cr)?

Back

The molar mass of chromium (Cr) is approximately 51.996 g/mol.

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond is formed through the transfer of electrons from one atom to another, while a covalent bond is formed by the sharing of electrons between atoms.

Tags

NGSS.HS-PS1-1

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a physical change?

Back

An example of a physical change is melting ice into water.

Tags

NGSS.MS-PS1-4