• The number of oxygen atoms

• The number of hydrogen atoms

• The number of molecules

• The number of electrons

Tags

NGSS.MS-PS1-1

Which element is represented by the symbol "Na" on the periodic table?

• Nitrogen

• Sodium

• Neon

• Nickel

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Which of the following is a chemical change?

• Melting ice

• Burning wood

• Breaking glass

• Dissolving sugar in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which process is an example of a physical change?

• Rusting of iron

• Boiling water

• Baking a cake

• Digesting food

Tags

NGSS.MS-PS1-4

Which of the following best describes the law of conservation of mass?

• Mass can be created in a chemical reaction

• Mass is destroyed during chemical changes

• Mass is neither created nor destroyed in a chemical reaction

• Mass always increases in a chemical reaction

Tags

NGSS.MS-PS1-5

Which element is involved in the chemical reaction of photosynthesis?

• Helium

• Carbon

• Sodium

• Iron

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

What is the chemical symbol for oxygen?

• O

• Ox

• Oy

• On

• 6

• 12

• 18

• 24

Tags

NGSS.MS-PS1-1

Which of the following is a sign of a chemical change?

• Change in shape

• Change in color

• Change in size

• Change in state

Tags

NGSS.MS-PS1-2