investigating properties of matter

The chemical formula for carbon dioxide is CO₂. Which statement describes the atoms present in THREE molecules of carbon dioxide.

• Three molecules of carbon dioxide contain 3 carbon atoms and 6 oxygen atoms.

• Three molecules of carbon dioxide contain 6 carbon atoms and 3 oxygen atoms.

• Three molecules of carbon dioxide contain 1 carbon atom and 2 oxygen atoms.

• Three molecules of carbon dioxide contain 9 carbon atoms and 18 oxygen atoms.

Tags

TEKS.SCI.7.6B

How many atoms of Oxygen are present in the following formula

Ca(NO₃)₂

• 5

• 4

• 6

• 7

Tags

TEKS.SCI.7.6B

The composition of aluminum sulfate is 2 aluminum atoms, 3 sulfur atoms, and 12 oxygen atoms. Which is the correct chemical formula for aluminum sulfate?

• AlSO₄

• Al₂(SO₄)₃

• Al₂SO₃

• Al(SO)₃

Tags

TEKS.SCI.7.6B

Organize these options into the right categories

Groups:

(a) Physical Change

,

(b) Chemical Change

• Burning

• Freezing

• Rusting

• Cutting

• Cooking

• Boiling

Tags

TEKS.SCI.7.6C

When sugar mixes with water, it is a ​ (a)   change because the sugar can come back if the water dries.
When sugar is cooked and turns black, it is a ​ (b)   ​ change because it makes something new.

• Physical
• Chemical
• Melting

Tags

TEKS.SCI.7.6C

An element has these properties:

-is brittle

• -does not conduct electricity

• -is a gas at room temperature

• Iron (Fe)

• Oxygen (O)

• Copper (Cu)

• Silver (Ag)

Tags

TEKS.SCI.6.6C

An element has these properties:

• -can be shiny like a metal

• -brittle like a nonmetal

• -sometimes conducts electricity

Which element has the properties listed?

• Sodium (Na)

• Boron (B)

• Neon (Ne)

• Gold (Au)

Tags

TEKS.SCI.6.6C

Match each example to the correct classification.

• Pizza

• Heterogeneous

• Salt (NaCl)

• Compound

• Gold

• Element

• Air

• Homogeneous

Tags

TEKS.SCI.8.6A

Which model shows a heterogeneous mixture?

• 
• 
• 
• 

Tags

TEKS.SCI.8.6A

Which model shows an element?

• 
• 
• 
• 

Tags

TEKS.SCI.8.6A