An example of a chemical change:
a) melting ice
b) painting a barn
c) bending pieces of metal
d) pouring vinegar into baking soda
What is pouring vinegar into baking soda
100
Write a chemical formula for a molecule that is an element and a molecule that is a compound.
What is O2 - molecule, element & H2O - molecule, compound
100
An object's MASS and VOLUME are needed to find its _________ .
What is DENSITY
100
The most abundant element in the universe is ____________ and the most abundant in the Earth's atmosphere is ______________.
What is hydrogen, nitrogen
100
Stable, don't form compounds
What is NOBLE GASES
200
The state of matter, (solid, liquid, gas), of a material of substance depends on what?
What is temperature
200
Is a compound physically or chemically bonded? Give an example.
What is Chemically bonded, H2O
200
Reactive in nature and are located in Group 2 of the periodic table
What is ALKALINE EARTH METALS
200
Silicon is the most abundant ____________ in the universe.
What is METALLOID
200
Highly reactive non-metals
What is HALOGENS
300
All matter is either a or .
What is substance or mixture
300
Two or more elements form a ____________ , but two or more atoms is called a ______________.
What is compound, molecule
300
The ability of metals or alloys to be pulled or rolled into wires
What is DUCTILITY
300
Highly reactive metals
What is Alkali Metals
300
Give three properties of non-metals
What is dull and brittle, insulators, poor conductor of heat and electricity
400
Element or compound that cannot be broken down into simpler components and maintain the properties of the original substance.
Name an example.
What is Substance, Salt, Water
400
Draw a molecule of ammonia, (NH4) and explain how many atoms of each element are present in the molecule.
What is 1 atom of Nitrogen, 4 atoms of hydrogen
400
Located in the last group of the periodic table
What are NOBLE GASES
400
Groups 3-12 of the periodic table
What is Transition Metals
400
Columns that run up and down the periodic table are called _____________.
What is groups
500
A combination of substances in which the individual substances do not change or combine chemically but instead retain their own individual properties.
Name an example.
What is mixture, lemonade, sweet tea.
500
A piece of firewood burns down into ashes in a fireplace. This is an example of a __________ change. The wood's ability to burn down to ashes is a __________ property.
What is chemical, chemical
500
Usually solid at room temperature, ______________.
Usually gases at room temperature, ______________.
What is METALS, NON-METALS
500
Not as reactive as Group 1, but reacts in nature
What is ALKALINE EARTH METALS
500
Group number ____ are the most reactive group of metals and are called __________________.