Science Praxis

Which of the following correctly represents an element?

• Carbon Monoxide - CO

• Copper - Cu

• Salt - NaCl

• Glucose - C₆H₁₂O₆

Tags

NGSS.MS-PS1-1

Compounds are pure substances. What other substances are considered pure substances?

• Solutions

• Mixtures

• Elements

• Chemical reactions

Which of the following substances is an element?

• CO₂

• NaS

• KF

• Co

Which of the following is a compound?

• Co

• Fe

• H

• CO

Tags

NGSS.MS-PS1-1

The chemical formula for baking soda, a common household chemical, is NaHCO₃. How many elements are in this compound?

• 1

• 4

• 5

• 6

Tags

NGSS.MS-PS1-1

Two liquids are mixed together. Which of the following does NOT identify the formation of a new substance?

• A gas is produced

• A solid is formed

• One liquid dissolves into the other

• The temperature changes

Tags

NGSS.MS-PS1-2

A student had a beaker with a small amount of baking soda. The student added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on observation, which of these can the student conclude?

• No chemical reaction took place.

• A chemical reaction produced a solid.

• Only a physical change happened.

• A chemical reaction produced a gas.

Tags

NGSS.MS-PS1-2

Which process can be used as evidence to identify the formation of a new substance?

A. Salt or sugar dissolves in hot water

B. The formation of a precipitate

C. Temperature change

D. Adding food coloring to cake icing to change the color

E. Adding food coloring to cake icing to change the color

F. Chemicals in fireworks explode into brilliant colors and give off smoke when exposed to a flame

• Processes A, B, C, and D

• Processes B, C, E, and F

• Processes B, C, D, and F

• Processes C, D, E, and F

Tags

NGSS.MS-PS1-2

Flour, sugar, cocoa, oil, and eggs are mixed together and placed in the oven to make a chocolate cake. When the cake is removed from the oven, it no longer looks like the original ingredients. Which of the following describes why the ingredients changed?

• A biological changed occurred.

• No change occurred.

• A physical changed occurred.

• A chemical changed occurred.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

After an investigation, students were disposing of leftover substances. One student poured all of the liquids down the sink drain. A few seconds later, a white cloud formed above the sink, and the student's eyes began to burn. Which statement accurately describes what occurred?

• The student did not wait 5 minutes in between pouring each liquid down the drain.

• The student did not allow water to run in the sink after pouring each liquid down the drain.

• A physical changed occurred resulting in the formation of a new substance.

• A chemical changed occurred resulting in the formation of a new substance.

Tags

NGSS.MS-PS1-2