Counting Atoms

How many different elements are present in the compound C6H12O6?

• 2 (Carbon, Hydrogen)

• 3 (Carbon, Hydrogen, Oxygen)

• 4 (Carbon, Hydrogen, Oxygen, Nitrogen)

• 1 (Carbon)

Tags

NGSS.MS-PS1-1

If a compound has the formula H2O, how many total atoms does it contain?

• 2 total atoms (1 H + 1 O)

• 3 total atoms (2 H + 1 O)

• 4 total atoms (2 H + 2 O)

• 5 total atoms (3 H + 2 O)

Tags

NGSS.MS-PS1-1

What is the formula to calculate the total number of atoms in a compound?

• Multiply the number of atoms of each element by their subscripts and add them together.

• Sum the number of atoms of each element, taking into account their subscripts.

• Count the number of elements in the compound and multiply by two.

• Add the atomic masses of each element in the compound.

Tags

NGSS.MS-PS1-1

What is the role of subscripts in chemical formulas?

• They indicate the type of chemical reaction.

• They specify the number of atoms of each element in a molecule.

• They represent the charge of the molecule.

• They show the state of matter of the compound.

What is the chemical formula for glucose?

• C6H12O6

• C5H10O5

• C6H10O6

• C7H14O7

Tags

NGSS.MS-PS1-1

In the compound H2C3O4N5, how many total nitrogen atoms are there?

• 3 nitrogen atoms

• 4 nitrogen atoms

• 5 nitrogen atoms

• 6 nitrogen atoms

Tags

NGSS.MS-PS1-1

How many oxygen atoms are in the compound C6H12O6?

• 4 oxygen atoms

• 5 oxygen atoms

• 6 oxygen atoms

• 7 oxygen atoms

Tags

NGSS.MS-PS1-1

What is the difference between a molecule and an atom?

• An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

• A molecule is the smallest unit of an element, while an atom is a group of two or more molecules bonded together.

• Atoms can exist independently, while molecules cannot exist independently.

• Molecules are larger than atoms and are made up of protons and neutrons.

Tags

NGSS.MS-PS1-1

How many hydrogen atoms are in one molecule of water (H2O)?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

What does the term 'element' refer to in chemistry?

• A pure substance that cannot be broken down into simpler substances by chemical means.

• A mixture of two or more substances that can be separated by physical means.

• A compound formed by the chemical combination of two or more elements.

• A solution that contains a solute dissolved in a solvent.