Physical and Chemical Properties

Which of the following is NOT an example of a chemical change?

• burning wood in a fire place

• a rusted nail

• making toast in the toaster

• ice melting

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sally and John were both in the kitchen when they decided to recreate a physical change that they saw demonstrated for them in science class. Sally then grabbed some baking soda and vinegar and mixed them together. The mixture then began to bubble and foam. John on the other hand pushed a glass cup off the counter so that it would fall and shatter on the ground.

Who properly demonstrated the phenomenon of a physical change and why?

• Sally, because the form of the baking soda and vinegar mixture changed but not its chemical composition

• Sally, because the chemical composition of the baking soda and vinegar mixture changed

• John, because the form of the glass cup changed but not its chemical composition

• John, because chemical composition of the glass cup changed

Tags

NGSS.MS-PS1-2

Sam’s mom accidentally leaves a gallon of milk in her car for several hours on a very hot day. She observes that the milk has not changed color and texture. When she feels the outside of the container it is warmer then when she purchased the milk and there is no condensation on the outside of the container. What is the best way for her to determine if the milk has spoiled?

• If the physical appearance has not changed than a physical change has not occurred and the milk has not spoiled.

• If it still feels cool a chemical change has not occurred and the milk has not spoiled.

• If the milk does not smell fresh a chemical change has occurred and then the milk has spoiled.

• If the temperature of the milk is over 32 degrees Celsius than a chemical change has occurred and then the milk has spoiled.

Tags

NGSS.MS-PS1-4

A student made observations about the following unknown solid:

1) The solid is combustible

2) The solid rusts when it comes in contact with water

3) The solid has a density of 120 g/mL

Which of the statements describes a physical property?

• 1

• 2

• 3

• 1 and 2

Marle places a powdered substance in a beaker of water and observes it bubbling. Which of the following is true?

• The powdered substance has the chemical property of combustibility.

• The powdered substance has the chemical property of reactivity.

• The powdered substance does not demonstrate chemical properties.

• The powdered substance has the physical property of solubility.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following lists contains only physical properties?

• color, texture, combustibility, reactivity

• density, mass, volume, length

• shape, odor, reactivity, size

• formation of a precipitate, solubility, shape, color

Which of the following describes a chemical change?

• Concrete expands and cracks on a hot day

• A Pond freezes on a cold night

• Jose tears a piece of paper

• Harry burns wood in the fireplace

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Carlos left his favorite watch outside in the rain. Now, he notices that it is starting to rust. Which clue of a chemical change can Carlos use to confirm that his watch has undergone a chemical change?

• release of gas

• change of odor

• change of temperature

• change of color

Tags

NGSS.MS-PS1-2

Using the chart above, determine the identity of a cube of metal that measures 1.2 cm on each side and has a mass of 15.4g.

• Gold

• Nickel

• Silver

• Zinc

Marsha fills a balloon with a 2 liters of helium. Calculate the mass of the helium in the balloon?

• 0.3146 g

• 0.07865 g

• 0.6369 g

• 0.7930 g