Counting Atoms

Counting Atoms

Assessment

Flashcard

Science

7th Grade

Hard

Created by

Wayground Content

FREE Resource

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15 questions

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1.

FLASHCARD QUESTION

Front

What is a balanced equation?

Back

A balanced equation has the same number of each type of atom on both sides of the equation, meaning mass is conserved.

2.

FLASHCARD QUESTION

Front

How do you determine if an equation is balanced?

Back

Count the number of atoms of each element on both sides of the equation. If they are equal, the equation is balanced.

3.

FLASHCARD QUESTION

Front

What does it mean if an equation is unbalanced?

Back

An unbalanced equation has a different number of atoms of one or more elements on each side, indicating that mass is not conserved.

4.

FLASHCARD QUESTION

Front

How many sodium (Na) atoms are in the compound NaCl?

Back

1 sodium (Na) atom.

5.

FLASHCARD QUESTION

Front

How many chlorine (Cl) atoms are in the compound NaCl?

Back

1 chlorine (Cl) atom.

6.

FLASHCARD QUESTION

Front

What is the coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound to indicate how many molecules or moles of that compound are present.

7.

FLASHCARD QUESTION

Front

If there is a '2' in front of H2O, how many hydrogen (H) atoms are there?

Back

There are 4 hydrogen (H) atoms because 2 x 2 = 4.

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