An element is

• Made up of different types of atoms

• Made up of the same type of atoms

• none of the above

• all of the above

Answer explanation

An element is defined as a substance that consists entirely of one type of atom. Therefore, the correct answer is 'Made up of the same type of atoms', as elements cannot be composed of different types of atoms.

Tags

NGSS.MS-PS1-1

Gold is an element

• True

• false

• none of the above

• All of the above

Answer explanation

Gold is indeed an element, classified as a chemical element with the symbol Au and atomic number 79. Therefore, the correct answer is True.

Tags

NGSS.MS-PS1-1

The three states of matter you find on the periodic table are

• Iron gold and silver

• solid liquid and gas

• freezing melting condensation

• non of the above

Answer explanation

The three states of matter are solid, liquid, and gas. These terms describe the physical forms substances can take, while the other options refer to specific materials or processes, making 'solid, liquid, and gas' the correct choice.

Tags

NGSS.MS-PS1-4

Atoms are composed of

• Nothing, they are the smallest unit

• molecules

• protons neutrons and electrons

• all of the above

Answer explanation

Atoms are made up of protons, neutrons, and electrons, which are the fundamental particles that compose them. Therefore, the correct answer is 'protons neutrons and electrons'.

Tags

NGSS.MS-PS1-1

two or more atoms that bind together form

• an element

• a molecule

• atoms

• none of the above

Answer explanation

When two or more atoms bond together, they form a molecule. An element consists of only one type of atom, while 'atoms' refers to the individual units themselves. Therefore, the correct answer is a molecule.

Tags

NGSS.MS-PS1-1

CO2 is an element

• true

• false

• both

• none

Answer explanation

CO2, or carbon dioxide, is a compound made of two elements: carbon (C) and oxygen (O). Therefore, the statement that CO2 is an element is false.

Tags

NGSS.MS-PS1-1

CO2 is a molecule

• true

• false

• none

• both

Answer explanation

CO2, or carbon dioxide, is a molecule composed of one carbon atom and two oxygen atoms. Therefore, the statement that CO2 is a molecule is true.

Tags

NGSS.MS-PS1-1

He Helium is an element

• true

• false

• none

• both

Answer explanation

Helium is indeed an element, specifically a noble gas with the atomic number 2. Therefore, the correct answer is true.

Tags

NGSS.MS-PS1-1

How many hydrogens does H20 have?

• 1

• 2

• 3

• 0

Answer explanation

H2O, or water, consists of two hydrogen atoms bonded to one oxygen atom. Therefore, the correct answer is 2.

Tags

NGSS.MS-PS1-1

Which of the following is NOT made of atoms?

• Air

• Water

• Molecules

• Energy, like light and sound

Answer explanation

Energy, like light and sound, is not made of atoms. In contrast, air and water are composed of molecules, which are made of atoms.

Tags

NGSS.MS-PS1-1