Quarter 2 Exam Practice

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 reactants equals the total mass of products.

Front

What is a hypothesis?

Back

A hypothesis is a testable statement or prediction about the relationship between two or more variables.

Front

What is an electron?

Back

An electron is a negatively charged subatomic particle found in the outer regions of an atom.

Front

How do particles in a liquid compare to those in a gas?

Back

Particles in a liquid are closer together and lower in energy than those in a gas.

Front

What is the smallest unit of matter?

Back

The smallest unit of matter is an atom.

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into new substances with different properties.

Front

What is an observation in scientific research?

Back

An observation is the act of noting and recording something with instruments or the senses.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements chemically bond together, while a mixture is a combination of two or more substances that retain their individual properties.

Front

What is the role of a control in an experiment?

Back

A control is a standard for comparison in an experiment, allowing the researcher to determine the effect of the variable being tested.

Front

What is the significance of sample size in an experiment?

Back

A larger sample size increases the reliability of the results and helps to minimize the impact of random variation.