How Do Atoms Combine to Make New Substances?
Atomic Models
Dissolving, Melting, Reacting
Chemical Reaction
Mystery Topic
100
What holds atoms together in molecules and compounds?

a. Glue

B. Freezing

c. Bonds

d. Magnetism

Bonds
100

The chemical formula for tin chloride is SnCl4

Draw a picture of a molecule of SnCl4 using only circles and squares

Example:

O-O-[]-O-O


**Your picture needs to have four shapes to show Cl, and one shape to show Sn.

100
Physical change? Or chemical reaction?


dissolving, melting, reacting.

Dissolving: physical change

Melting: physical change

Reacting: chemical reaction

100
Complete this equation:


2 Co + 3 H2O → Co2O3 + _______

2 Co + 3 H2O → Co2O3 + 3 H2

100
This is a rock made from pieces of other broken rocks.
sedimentary rock
200
CaCO3

Draw the atom tiles.

How many atoms are there?

How many elements are there?

What are the element names?

Ca  C  O  O  O


There are 5 atoms.

There are 3 elements.

Calcium, Carbon, Oxygen

200

Draw the atom tiles for sodium bicarbonate.


Na H C O O O

200

Think back to when we used candles to melt sucrose. C12H22O11 It turned from solid to liquid. 

As a liquid, is it still sucrose? C12H22O11

It is still sucrose when it melts.

C12H22O11

200

Vinegar is also called acetic acid. The chemical formula is: C2H4O2

Acetic acid reacts with sodium bicarbonate: NaHCO3

Write the chemical equation for these two substances reacting. 

Hint: There are three products. One is carbon dioxide.

C2H3O2Na + CO2 + H2O

200
this rock is made from cooled magma
igneous rock
300

Compound? Or element?

Cl

O2

H2

H2O


Element

Element

Element

Compound

300
Draw a liquid water molecule

Draw a frozen water molecule

Draw a gaseous (gas form) molecule


All three look the same
300
200 grams of sugar were dissolved into a pitcher of water. Then all of the water is then dissolved. 


What will be left in the pitcher?

200 grams of sugar.


Double points: was this a physical change or a chemical change?

300
Which of these could accurately represent a chemical reaction?


a. XX +YY -> RR + WW

b. XX + YY -> RRRR

c. XX + YY -> XX + YY

d. XX + YY -> XXYY

d. XX + YY -> XXYY

300
this rock is made from a chemical reaction due to heat and pressure
metamorphic rock
400
Explain the difference between an ionic compound and a molecular compound. Give an example of each.

An ionic compound has atoms held together with weak bonds. Example: NaCl

A molecular compound has atoms held together with strong bonds. Example: H2O

400

How many atoms? How many elements? How many compounds?

2H2 + O2 → 2H2O

6 atoms

2 elements

1 compound

400
A student was melting sugar over a candle.

The sugar turned from solid to liquid, and then black and smoky.

Was this a physical change? Or a chemical reaction?

Both

The melting is a physical change, and the burning is a chemical change.

400

Eggshells are made are made of calcium carbonate. If you drip hydrochloric acid on eggshells, they will fizz.

CaCO3 + HCl ->_______________

What substance will be created in this chemical reaction?

CO2

400
this is the only kind of rock that fossils can be found in
sedimentary rock
500
What is the basic particle from which all matter is made?
Atoms 
500
Draw the atom tiles for sodium bicarbonate.

Na     H     C     O     O     O


500
Explain what a reactant is and give and example.

Explain what a product is and give an example.

A reactant is one of two or more substances which goes through a chemical change together.

The product is the new substance(s) which is a result of the rearrangement of atoms from the reactants.

500
A scientist uses a sealed container to make a chemical reaction. The two reactants each weigh 2 grams. The container weighs 50 grams. (the total weight is 54 grams) During the reaction, the two reactants fizzed into a gas.


What will the total weight be after the reaction?


54 grams
500
which is an actual scientific claim?


A monkey turned into a human

An ancient primate turned into a human

The monkey species turned into the human species

An ancient species slowly changed into the human species

An ancient species slowly changed into the human species

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