Q2 Science Practice Assessment

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of the reactants equals the total mass of the products.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and cannot be separated into other substances by physical means. Examples include elements and compounds.

Front

What is the smallest unit of matter?

Back

The smallest unit of matter is an atom, which is the basic building block of all substances.

Front

What is replication in scientific experiments?

Back

Replication is the process of repeating an experiment to verify results. It involves following the same procedures as the original experiment.

Front

What is the pH scale?

Back

The pH scale is a measure of how acidic or basic a substance is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements chemically combined.

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 conducting experiments multiple times?

Back

Conducting experiments multiple times helps to ensure the reliability and accuracy of the results.