Chem 2 Review

Front

What is the chemical formula for sugar and what does it represent?

Back

The formula for sugar is C₆H₁₂O₆, which means it has 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

Front

How do you use a Triple Beam Balance to measure mass?

Back

You adjust the weights on the balance until the beam is level, then read the mass from the scale. For example, a correct measurement might be 77.5 grams.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

How many hydrogen atoms are in the molecule C₆H₁₂O₆?

Back

There are 12 hydrogen atoms in the molecule C₆H₁₂O₆.

Front

Is dissolving chocolate syrup in milk a physical or chemical change?

Back

Dissolving chocolate syrup in milk is a physical change (A) because the syrup can be separated from the milk.

Front

What happens to the mass of a substance during a physical change?

Back

The mass of a substance remains the same during a physical change, as no new substances are formed.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the rusting of iron, where iron reacts with oxygen to form iron oxide.

Front

What is the significance of the coefficients in a chemical formula?

Back

Coefficients indicate the number of molecules or moles of a substance in a chemical reaction.

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.

Front

How can you identify a chemical change?

Back

Signs of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.