Structure of Matter

Here are models of 3 different substances. They all have the same chemical formula of C₅H₁₂. How is it possible that they have the same formula, but are all different substances?

• The number of atoms is different.

• The arrangement of the atoms is different.

• There is no way this can occur.

Tags

NGSS.MS-PS1-1

How many molecules (or groups) are there in 2CH₄?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

True or False. Molecules are defined as two or more of the same or different atoms bonded.

• True

• False

Tags

NGSS.MS-PS1-1

True or False. Elements are basic forms of matter that cannot be broken down into a simpler substance

• True

• False

Matter is made up of tiny particles called ...

• minerals

• cells

• molecules

• atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Elements are made of ​ (a)   .

• atoms

• molecules

Tags

NGSS.MS-PS1-1

The number of protons in an atom is also known as the (a)   .

• Atomic number

• Mass number

• Neutron number

• Electron number

Answer explanation

The number of protons in an atom is also known as the atomic number.

Match the subatomic particle with its charge

• Positive

• Proton

• Negative

• Electron

• Neutral

• Neutron

Both the proton and the ​ (a)   have a mass unit of 1 AMU, while the ​​ (b)   has a mass unit of 0 AMU.

• neutron

• electron

Tags

NGSS.MS-PS1-1

An ​ (a)   is different form of the same element

• atomic number

• isotope

• metals

• noble gases

• nonmetals

• tritium