chemistry
What is a compound.
A combination of two or more chemically-bonded elements.
What is The Periodic Table.
This is a chart which organizes the chemical elements
What is a Physical Change
A change that does not produce a new substance.
CO2 + H2O → C6H12O6 + O2
6 CO2 + 6 H2O = C6H12O6 + 6 O
Can water stay liquid below zero degrees Celsius
Yes, water can stay liquid below zero degrees Celsius.
what is a molecule.
A combination of two or more atoms.
What is The Atomic Number.
Number of protons in the Nucleus.
What is a Chemical Change
A change that produces a new substance.
Fe + Cl2 = FeCl3
2 Fe + 3 Cl2 = 2 FeCl3
Can you light diamond on fire.
Diamond can indeed be set on fire since it is made of carbon.
what is the importance of chemistry
for meeting our basic needs of food, clothing, shelter, health, energy, and clean air, water
What is The Atomic Mass.
The sum of the number of Protons plus Neutrons in the Nucleus.
What is Condensing.
This is when a gas changes to a liquid.
KBrO → KBr + KBrO2
2KBrO → KBr + KBrO2
How can glass be a liquid if it's so hard.
a supercooled liquid.
What is a substance.
A chemical substance is a form of matter having constant chemical composition and characteristic properties.
What is a Group
Columns or multiple columns in the periodic table.
What is a Homogeneous Mixture
A substance that contains regions that have different properties from those of other regions.
CrH6 → Cr + H2
CrH6 → Cr + 3H2
What are atoms.
the basic unit of a chemical element.
What is a mixture.
a mixture is a material made up of two or more different chemical substances which are not chemically combined.
What are Alkaline Earth Metals.
Beryllium, Magnesium, Calcium, Strontium, Barium, Radium.
What is Density
A measure of how much mass is contained in a given unit volume.
Cr + H2 → HCr
2Cr + H2 → 2HCr
What is an acid
a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind