P.1.3

John and Lisa collected a sample of ocean water and placed it in a jar. Within a couple of days, the water had evaporated and salt crystals were visible at the bottom of the jar. This is an example of a

• chemical change

• physical change

• compound

• element

Tags

NGSS.MS-PS1-4

Some power plants produce energy by burning coal. In these power plants, the heat from burning coal is used to boil water. Which statement BEST describes the changes that occur when burning coal and boiling water?

• Burning coal and boiling water are both physical changes.

• Burning coal and boiling water are both chemical changes.

• Burning coal is a chemical change, and boiling water is a physical change.

• Burning coal is a physical change, and boiling water is a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student placed an acid with a metal, which produced hydrogen gas and a solid precipitate. This is evidence that...

• only a physical change occurred due to gas production

• only a physical change occurred due to a state change

• a chemical change occured due to the new substances forming

• both a physical and chemical change occured

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a general property of an acid?

• tastes sour

• feels soapy/slippery

• tastes bitter

• changes the color of litmus paper from red to blue

In physical changes, substances might change in ________ but not in _______

• appearance, composition

• volume, state of matter

• texture, color

• weight, mass

Tags

NGSS.MS-PS1-4

A physical change can sometimes result in a color change. Which of the following situations shows this?

• Milk turning yellow when it spoils

• Dough becoming darker when its baked into a cookie

• A red candy dissolves and turns water pink

• A match turning black after its burned

In the science lab, Raul combines an acid and a base and determines that a chemical change has taken place. Sika recorded her information in the table below. What evidence might she have based this on?

• Neither substance smelled or looked different after she combined them.

• Both substances turned the pH paper to the same color.

• There was no change in pH after she combined the substances.

• The pH was closer to neutral after she combined the substances.

Tags

NGSS.MS-PS1-2

Which of the following WILL NOT increase the speed of a reaction?

• Increasing temperature

• Increasing surface area

• increasing the volume of a container

• Adding a catalyst

Tags

NGSS.HS-PS1-5

When a small piece of white marble rock is carefully placed in a beaker of hydrochloric acid, bubbles form on the surface of the rock and rise to the top of the liquid. Which conclusion best fits the observation?

• The rock reacted with the acid and made a new gaseous substance

• The rock heated with the acid until it began to boil

• Nothing changed

• The rock dissolved in the cold by breaking into small pieces

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of a potato. The yellow orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato Which is the best example as to why the iodine solution changed on the potato?

• The iodine mixed with the colors of the potato so it looked black

• The iodine reacted with the potato to form a new substance

• The iodine burned the potato and it turned to ash

• The iodine evaporated into gas

Tags

NGSS.MS-PS1-2