End of Semester 1 Exam Review

Front

What does the chemical formula H₂O represent?

Back

Hydrogen and Oxygen

Tags

NGSS.MS-PS1-1

Front

Which chemical formula represents a compound? Options: O₂, NaCl, Fe, Ag

Back

NaCl

Front

How many atoms are present in Mg(OH)₂?

Back

6

Tags

NGSS.MS-PS1-1

Front

Which of the following is an example of a chemical change? Melting butter, Cutting paper, Burning a candle, Freezing water

Back

Burning a candle

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Why is rusting iron classified as a chemical change?

Back

A new substance is formed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is always evidence that a change is a chemical change?

Back

Formation of a new substance

Tags

NGSS.MS-PS1-2

Front

What happens to the solubility of sugar in water as the temperature increases?

Back

It increases.

Tags

NGSS.MS-PS1-4

Front

Which pair of substances dissolve in water?

Back

Sugar and salt

Front

Amy fixed a glass of lemonade and added too much sugar. She added water to improve the taste. What BEST describes this change?

Back

The added water diluted the sugar in the solution.

Front

If a train moves 45 kilometers in 30 minutes, what is its average speed?

Back

90 km/h