Chemical Equations

Chemical Equations

Assessment

Flashcard

Science

7th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the little number written below an element in a chemical equation called? Example: H₂

Back

Subscript

2.

FLASHCARD QUESTION

Front

Which of the following is NOT a sign of a chemical change? A sudden release of heat, Bubbles forming, Two liquids mixed creating a precipitate, Melting in the hot sun

Back

Melting in the hot sun

3.

FLASHCARD QUESTION

Front

Is the following equation balanced? 2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

Back

Yes

4.

FLASHCARD QUESTION

Front

Which of the following equations are correctly balanced? 1) 12CO₂ + H₂O --> C₆H₁₂O₆ + O₂ 2) CO₂ + 9H₂O --> C₆H₁₂O₆ + O₂ 3) CO₂ + H₂O --> 3C₆H₁₂O₆ + O₂ 4) 6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

Back

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

5.

FLASHCARD QUESTION

Front

How many Hydrogen are in 4H₂O?

Back

8

6.

FLASHCARD QUESTION

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

7.

FLASHCARD QUESTION

Front

What does a coefficient in a chemical equation represent?

Back

The number of molecules or moles of a substance.

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