What kind of property is the flame color of burning a material?
Physical
100
What usually happens to the number of electrons as you move left to right across the periodic table?
They increase
100
When atoms react chemically, what is transferred or shared?
electrons
100
What is the solvent in lemonade?
Water
100
6. What is the base metric unit that is used to measure length?
meter
200
Which state of matter is water vapor?
Gas
200
What are horizontal rows in the periodic table called?
PERIODS
200
Where are elements with positive oxidation numbers found on the periodic table?
On the left
200
What is the most common element in air?
Nitrogen
200
What are vertical columns in the periodic table called?
Groups or families
300
When heating a liquid in a test tube, what should you never do?
LOOK DOWN THE TEST TUBE
300
In neutral atoms, what two subatomic particles are always equal?
Protons and electrons
300
What type of bond forms between elements with positive and negative oxidation numbers?
ionic
300
What state of matter is the best insulator?
gas
300
What type of reaction is exploding fireworks an example of?
exothermic
400
A kilogram would be used to measure what in the metric system.
Mass
400
What are elements that have the same number of protons but different numbers of neutrons called?
isotopes
400
What would be the name of the compound made between chlorine (found on right side of periodic table) and potassium (found on left side of periodic table)?
potassium chloride
400
What type of reaction is • Mg + O2 ---> MgO
Synthesis
400
What is the base metric unit that is used to measure time?
second
500
What type of changes form new products?
Chemical
500
In the original periodic table, what were elements lined up by?
atomic mass
500
Which type of atoms can form covalent bonds with each other atoms to form long chains and rings of highly complicated molecules?
Carbon
500
What are the only elements that carbon atoms are bonded to in a saturated hydrocarbon?
Hydrogen
500
When trying to find the density of a substance, density = ?