Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below.

Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves.

Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.

Test 3: Heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees Fahrenheit.

Which statement provides the best assessment of his tests?

• Only Test 3 will indicate a chemical property of sodium bicarbonate. Tests 1 and 2 will show a physical property of the substance.

• Only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. Test 3 will show a physical property of the substance.

• Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.

• Only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. Test 2 will show a physical property of the substance.

Tags

NGSS.MS-PS1-2

When hydrogen peroxide bubbles, it is undergoing a chemical change. Which statement best describes what is happening?

• The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.

• The atoms in hydrogen peroxide are breaking apart and recombining into the original molecules.

• The molecules of hydrogen peroxide remain intact as new types of molecules form and move out of the liquid.

• The molecules of hydrogen peroxide remain intact but move more quickly to allow evaporation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which example illustrates a chemical change?

• shredding paper

• smashing a soda can

• burning wood

• chopping wood

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If a person has the values for an object’s density and volume, what value can be calculated?

• the object’s size

• the object’s mass

• the shape the object forms in a container

• the amount of space the object takes up

Which tools would Sara use to find an irregularly shaped object’s mass and volume?

• a meter stick, a ruler, and water

• a meter stick, a balance, and water

• a balance, water, and a ruler

• a balance, water, and a beaker

Chanel has some cotton candy that came in a cloudy shape. She wants to make it more dense. Which describes the candy before and after Chanel manipulated it?

• The candy before was a cube, and the candy after was a ball.

• The candy before was compacted, and the candy after was fluffy.

• The candy before was fluffy, and the candy after was compacted.

• The candy before was a ball, and the candy after was a cube.

Which object would sink in honey, which has a density of 1.4 g/cm³?

• Object 1 (0.9 g/cm³)

• Object 2 (1.2 g /cm³)

• Object 3 (0.2 g/cm³)

• Object 4 (2.3 g/cm³)

What is conserved in physical changes?

• shape

• energy

• mass

• density

What happens to the total mass of a substance undergoing a physical change?

• It stays the same.

• It doubles.

• It triples.

• It is reduced.

Tags

NGSS.MS-PS1-4

An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?

• The boiling point of the nitrogen increased.

• The mass of nitrogen increased.

• The color changed.

• The density changed.