Law of Conservation of matter

 $2HO_3+Ce$  How many oxygen atoms are there

• 6

• 12

• 2

• 3

Tags

NGSS.MS-PS1-1

A chemical equation must always be

• balanced

• equal

• wrong

• rearranged

Tags

NGSS.MS-PS1-5

What is a coefficient?

• the amount of matter in an object

• a number before the chemical formula

• a small number in a chemical formula that indicates the number of atoms of an element in a molecule

Tags

NGSS.MS-PS1-1

Is this chemical equation balanced ?

• yes

• no

Tags

NGSS.MS-PS1-5

What is the relationship between the mass reactants and the mass product in a chemical equation?

• they ALWAYS have to be wrong

• they ALWAYS have to be equal

• they must have subscripts

• they must have coefficient

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The number of atoms of each element........

• rearrange

• remains the same

• go through a chemical reaction

• change into different molecules

Tags

NGSS.MS-PS1-5

Look at the equation  $Ca+Cl_2$  . How many cl will come out in the product

• 3

• 2

• 6

• 8

Tags

NGSS.MS-PS1-2

 $2H_3+Na$  How many Hydrogen (H) are there in the equation

• 6

• 8

• 3

• 2

Tags

NGSS.MS-PS1-1

When you have a coefficient and a subscript in the same equation what do you do with them?

• add

• subtract

• divide

• multiply

The substance present after the reaction is the ....

• mass

• volume

• product

• coefficient

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2