Chemical Properties and Changes

Physically could crumple paper up, chemically you could burn the piece of paper

Describe what you could do to change a piece of paper physically and chemically.

created or destroyed

The law of conservation or mass states that matter cannot be ____________.

is the same as

The mass of the end products after a chemical reaction ______________ the mass of the original material.

cook the egg

When you eat scrambled eggs, many changes occur to the eggs. Which of the following best describes a chemical change?

as it turns into ash, smoke and gases

Where does the mass of the wood go after the fire it out?

flammability

Which of these is a chemical property?

boiling water

Which of these is a physical change when there is the formation of bubbles?

baking cake in the oven

Which step in making a cake results in a chemical change?

to stop chemical changes due to light

Why are vitamins sold in dark bottles?

combustibility

a bonfire is an example of this property

ability to react with oxygen

an example of a chemical property is _________.

cake baking, iron nail rusting, apple rotting

examples of changes that produce a new substance

freezing, dissolving, evaporating

examples of physical change

oxygen

When iron rusts it reacts with ____________ in the air.

a new substance is formed

A chemical change is different than a physical change because in a chemical change __________.

burning

An example of a chemical change is _______________.

never

Chemical changes can ________ be reversed.

H2 + 2 HaC1

If the reactants on the left side of a chemical equation are 2 Na + 2 HC1, the products in a balanced equation could be _________.

the number of atoms in the reactants equals the number of atoms in the products

In a chemical reaction mass is conserved. This means that __________.

1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

In the chemical reaction CH4+2O2---CO2 + 2H2O there are reactants on the left of the equation and products on the right. If you count the atoms in the reactants, there are ________.

25 grams

In the equation 2Hg) --- 2 Hg + O2, the beginning mass of the 2HgO is 225 grams. The end mass of the 2Hg is 200 grams. What is the mass of the O2?

chemical property

Titanium reacts less with oxygen than most metals do. This is a ___________.

heat, smoke, and light

What is a sign that a chemical change has taken place?

Rust, this property is a chemical property

What property makes it necessary to paint iron lawn furniture is left outside for long periods of time? Is this property chemical or physical?

a new substance being formed

When a chemical change takes place it results in ______________.

chemical change

When a peeled banana turns black it is what kind of change?