EN - Chemical Reactions and Equations Quiz

The logs in this fireplace will continue to burn until only ash is left. This is an example of a

• A. physical reaction

• B. burning reaction

• C. natural reaction

• D. chemical reaction

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which part of the car shown in the picture is an example of chemical reaction?

• A. The metal on the body which has turned to rust.

• B. The rubber of the tires which are flat.

• C. The glass in the windows which has shattered.

• D. The trunk which is slightly opened.

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NGSS.MS-PS1-2

The chemical formula for water is H₂O. The 2 in the formula represents a

• A. coefficient

• B. element

• C. superscript

• D. subscript

Answer explanation

A coefficient is the total number of molecules and will always be found in front of the letters, big numbers;

Subscripts - are the number of atoms for the element and is the little numbers found at the bottom of letters (symbols)

Ammonia and water react to form ammonium hydroxide, which is found in many household cleaners. The equation shown above to represent this reaction is balanced because

• A. hydrogen is found twice on both sides of the equation

• B. water is present

• C. the same number of atoms of each substance is present on both sides of the equation

• D. there are a total of four elements on each side of the equation

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NGSS.MS-PS1-5

Water and carbon dioxide react to form carbonic acid which is found in soda. The reaction is represented by the equation above. Which subscript needs to be added in the box to make this equation balanced?

• A. 1

• B. 2

• C. 3

• D. 4

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sodium hydroxide is a chemical compound used to manufacture paper. The chemical equation to represent the reaction is Na₂O + H₂O → 2NaOH. The "2" found in front of the sodium hydroxide in the product represents a(n)

• A. coefficient

• C. superscript

• D. subscript

The chemical formula for photosynthesis is 6EO2 + 6H₂O → C6H12O6 + 60₂. How many atoms of oxygen are found in the product?

• A. 2

• B. 6

• C. 8

• D. 18

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NGSS.MS-LS1-6

NGSS.MS-PS1-5

Ammonia is found in many common household cleaners, and is created when nitrogen reacts with hydrogen. Which of the following chemical equations that represent this reaction is balanced?

• A. N2 + H₂ → NH3

• B. N₂ + 3H₂ → 3NH3

• C. N₂ 3H2 → 2NH3

• D. 3N₂ + H₂ NH3

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NGSS.MS-PS1-5

The picture shows the different stages of a slice of bread being burnt. Which of the following CANNOT be used as an evidence of a chemical change?

• Heat energy was absorbed during the change.

• The burned part of the toast did not taste good.

• The burned part changed color and turned black.

• The surface of the bread changed to carbon.

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

When this candle is burned it seems to disappear over a period of time. In ash, and carbon dioxide, and the energy is being released as heat and light. This is an example of ___________________________.

• Murphy's Law

• the law of conservation of mass

• the law of chemical reactions

• the law of nature

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NGSS.MS-PS1-2

NGSS.MS-PS1-5