Unit 1 Review Chemistry

Mr. Gordon is sick to his stomach. A friend advises him to take an Alka-Seltzer. Mr. Gordon follows the directions on the package and adds two tablets to a glass of water. As soon as the Alka-Seltzer tables go into the water, the liquid begins to bubble.

a.      Type of change:      Physical     or      Chemical

b.     Evidence:

Tags

NGSS.MS-PS1-2

Mr. Gordon is sick to his stomach. A friend advises him to take an Alka-Seltzer. Mr. Gordon follows the directions on the package and adds two tablets to a glass of water. As soon as the Alka-Seltzer tables go into the water, the liquid begins to bubble.

a.      Type of change:      Physical     or      Chemical

b.     Evidence:

Tags

NGSS.MS-PS1-2

Darlene adds Bob's Super Plant Vitamins to a container of water in preparation for fertilizing her garden. When the vitamin mixture goes into the water, Darlene notices that the container becomes cold.

a.      Type of change:      Physical     or      Chemical

b.     Evidence:

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Green plants use sunlight to perform photosynthesis.

a.      Type of change:        Physical       or       Chemical

b.      Evidence:

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

A student heats dark-gray, pure iron filings in an open test tube exposed to air in a lab. She

observes the formation of a red solid in the test tube. What can she conclude about the red solid?

• It is an element because it dissolved when heated

• It is a compound because it is a simpler substance of the iron filings that broke down when they were heated.

• It is a compound because it is a new substance formed from iron filings and air after the iron filings were heated.

• It is an element because it turned red when heated.

Tags

NGSS.MS-PS1-2

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Which of the following most likely describes the reaction in the diagram?

• The heat created a chemical reaction between the iron and sulfur, creating a compound of iron sulfide with new chemical properties.

• The heat created a physical reaction between the iron and sulfur, creating a mixture with new physical properties.

• The heat evaporated the iron and sulfur, creating a precipitate with new chemical properties.       

• The heat melted the iron and sulfur, creating a solution with new physical properties.

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NGSS.MS-PS1-2

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What occurred in the diagram?

• A physical change, because a solid formed when the two liquids combined

• A chemical change, because a yellow substance formed when the two liquids combined

• A chemical change, because the volume of the final solution was larger than the initial solutions

• A physical change, because the temperature changed with no outside source applied

Tags

NGSS.MS-PS1-2

                                                          

How many atoms of oxygen are in a molecule of glucose   C₆H₁₂O₆     ?

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NGSS.MS-PS1-1

• 3 iron atoms, 2 carbon atoms, and 4 oxygen atoms.

• 2 iron atoms, 6 carbon atoms, and 12 oxygen atoms

• 2 iron atoms, 2 carbon atoms, and 12 oxygen atoms

• 3 iron atoms, 4 carbon atoms, and 8 oxygen atoms

Tags

NGSS.MS-PS1-1

The molecule is —

• An atom composed of oxygen and carbon elements

• an element composed of oxygen and carbon atoms

• a compound composed of oxygen and carbon atoms

• a mixture composed of oxygen and carbon compounds

Tags

NGSS.MS-PS1-1