Counting Atoms

Counting Atoms

Assessment

Flashcard

Science

7th Grade

Practice Problem

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 chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during the reaction.

2.

FLASHCARD QUESTION

Front

How do you determine if a chemical 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 the coefficient in a chemical equation represent?

Back

The coefficient indicates the number of molecules or moles of a substance involved in the reaction.

4.

FLASHCARD QUESTION

Front

How many hydrogen atoms are in H₂O?

Back

There are 2 hydrogen atoms in one molecule of water (H₂O).

5.

FLASHCARD QUESTION

Front

What is the formula for calculating the number of atoms in a compound?

Back

Multiply the subscript of each element by the coefficient in front of the compound.

6.

FLASHCARD QUESTION

Front

In the compound (NH₄)₂CrO₄, how many nitrogen atoms are present?

Back

There are 2 nitrogen atoms in (NH₄)₂CrO₄.

7.

FLASHCARD QUESTION

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.

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