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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. C₁₂H₂₂O₁₁It 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?

O₂

H₂

H₂O

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

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