Chemistry Investigation Conclusions

Front

Lab partners follow the instructions during their chemistry investigation very carefully. They measure 200 mL of a clear liquid into a beaker. Then they measure 50 mL of a different clear liquid into a graduated cylinder. They pour the liquid from the graduated cylinder into the beaker. The image above shows the results.  

Which should the partners conclude about the two liquids?

A. Both liquids cooled when they were mixed. 

B. Filtering would make it possible to separate the liquids. 

C. A chemical reaction occurred when the liquids were mixed. 

D. A new substance with the same properties as the original liquids formed

Back

C. A chemical reaction occurred when the liquids were mixed.

Tags

NGSS.MS-PS1-2

Front

Which of the following represents a molecule? 

A. Ca

B. Co

C. CO

D. Cu

Back

C. CO

Tags

NGSS.MS-PS1-1

Front

Juan is reading the information that came with new medicine he has to take. One of the ingredients is lactose (C12H22O11) . What can Juan conclude about lactose based on the formula? 

A. Some people may be allergic to lactose. 

B. Lactose is a key ingredient in many medicines. 

C. A lactose molecule contains 12 atoms of carbon.

D. A lactose molecule contains 45 atoms of carbon.

Back

C. A lactose molecule contains 12 atoms of carbon.

Tags

NGSS.MS-PS1-1

Front

Salt and sugar appear similar, but their crystals look different at the atomic level. What does this say about the molecular structures of salt and sugar?

A. Salt and sugar molecules contain the same atoms arranged in different patterns. 

B. Salt and sugar molecules contain different atoms arranged in different patterns. 

C. Salt and sugar molecules are made of different atoms arranged in the same pattern. 

D. Salt and sugar molecules are made of the same atoms arranged in the same patterns.

Back

C. Salt and sugar molecules are made of different atoms arranged in the same pattern. 

Tags

NGSS.MS-PS1-1

Front

Hydrogen (H) and oxygen (O) are pure substances. Each is made of only one type of atom, but hydrogen atoms are different from oxygen atoms. Hydrogen and oxygen chemically combine to form water (H2O).

Based on this information, which statement is true?

A. Hydrogen, oxygen, and water are all elements.

B. Hydrogen, oxygen and water are all molecules.

C. Hydrogen and oxygen are elements, and water is a molecule.

D. Hydrogen is an element and oxygen and water are molecules.

Back

C. Hydrogen and oxygen are elements, and water is a molecule.

Tags

NGSS.MS-PS1-1

Front

 According to the law of conservation of mass, how much mass does the Zinc have in this equation?

A. 40 g

B. 88 g

C. 104 g

D. 256 g

Back

C. 104 g

Tags

NGSS.MS-PS1-5

Front

The first part of a balanced chemical equation is shown: Cu +2AgNO3 → ______________. In order for this equation to be balanced, how many oxygen (O) atoms must be present in the products? 

A. 2

B. 3

C. 5

D. 6

Back

B. 3

Tags

NGSS.MS-PS1-5

Front

 In a laboratory, Selina added five drops of hydrochloric acid to a container with sodium bicarbonate (baking soda). 

Which observation helps her determine whether a chemical change has taken place? 

A. formation of bubbles

B. formation of a mixture

C. change in the color of the sodium bicarbonate

D. change in the shape of the sodium bicarbonate

Back

A. formation of bubbles

Tags

NGSS.MS-PS1-2

Front

Which Box contains only elements?

A. Box A

B. Box B

C. Box C

D. Box D

Back

C. Box C

Tags

NGSS.MS-PS1-1

Front

What is the chemical formula for table salt?

A. NaCl

B. KCl

C. NaBr

D. KBr

Back

A. NaCl