Matter Composition and Changes Review

How many atoms of oxygen are in H₂O?

• 1

• 2

• 0

Tags

NGSS.MS-PS1-1

In 2CO₂, there are 2 carbon atoms and (a)   oxygen atoms.

Tags

NGSS.MS-PS1-1

Count the atoms in Ca(OH)₂

• 1 Ca

  1 O

  1 H

• 2 Ca

  2 O

  2 H

• 1 Ca

  2 O

  2 H

• 1 Ca

  1 O

  2 H

Tags

NGSS.MS-PS1-1

If you see the coefficient 3 in front of H₂O (written as 3H₂O), how many hydrogen atoms are there total?

• 3

• 6

• 9

• 5

Tags

NGSS.MS-PS1-1

How many total atoms are in one molecule of Al₂(SO₄)₃

(a)  

Tags

NGSS.MS-PS1-1

Which part of the formula tells you how many groups of atoms there are?

• Subscript

• Coefficent

• Parentheses

• Capital Letter

Write a formula that has 1 atoms of sodium and 2 atoms of chlorine

(a)  

Tags

NGSS.MS-PS1-1

How many magnesium atoms are in 4Mg₃(PO₄)₂

• 8

• 3

• 7

• 12

Tags

NGSS.MS-PS1-1

When ice melts into liquid water, what type of change has occurred?

• Chemical change

• Physical Change

• Both

• No Change

Salt is dissolved in water. What type of change is this?

• Chemical, because it can’t be undone

• Chemical, because the salt disappeared

• Physical, because no new substance is formed

• Neither, because nothing changed