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?
