Counting Atoms Practice

Counting Atoms Practice

Assessment

Flashcard

Science

9th 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 chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements and numbers to indicate the quantity of each element.

2.

FLASHCARD QUESTION

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element that are present in a molecule. For example, in H2O, the '2' indicates there are 2 hydrogen atoms.

3.

FLASHCARD QUESTION

Front

What is a coefficient in a chemical formula?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are present. For example, in 2H2O, the '2' indicates there are 2 molecules of water.

4.

FLASHCARD QUESTION

Front

How many total atoms are in a molecule of C6H12O6?

Back

There are 24 total atoms in a molecule of C6H12O6 (6 Carbon + 12 Hydrogen + 6 Oxygen = 24).

5.

FLASHCARD QUESTION

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different types of atoms bond together.

6.

FLASHCARD QUESTION

Front

How many different elements are in the compound NaCl?

Back

There are 2 different elements in NaCl: Sodium (Na) and Chlorine (Cl).

7.

FLASHCARD QUESTION

Front

What is the significance of parentheses in a chemical formula?

Back

Parentheses in a chemical formula indicate that the atoms inside the parentheses are grouped together and may be multiplied by a subscript outside the parentheses. For example, in Ca(OH)2, the '2' applies to both O and H.

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