What are basic units that make up all matter?
Atoms
What change may change the appearance or form of the matter, but it’s the same element or compound that it was before the change occurred?
A physical change
What are elements that lack the properties of metal?
Nonmetals
What is anything that takes up space and has mass and is almost everything except for energy?
Matter
What is the atomic number of Aluminum?
13
What is a subatomic particle with a negative charge?
electron
Which change transforms matter into one or more new substances?
A chemical change
Between metals, nonmetals, and metalloids, which one has a high malleability?
metal
What is any matter with a definite composition and characteristic property?
A substance
What is the average atomic mass of Gold? (in a.m.u.)
196.97 a.m.u.
What is a horizontal row across the periodic table?
period
Which of these choices is NOT a sign of a chemical change? ( put the number only!)
1. Formation a precipitate
2. Temperature change
3. Change in the state of matter ( solid, liquid, gas)
4. Color change
3.
What is an extremely reactive group of metals, found in group 1, that are always found in a compound in nature?
Alkali Metals
What are two or more atoms that are chemically combined?
Molecules
In a chemical equation, what tells you the number of atoms in each element, in each molecule?
the subscript
What are atoms of the same element with a different number of neutrons?
Isotopes
Liquid H2O -> solid H2O is what type of change?
Physical change
What is the name of the group that does not react with anything and is made up of gases?
Noble Gases
What type of mixture is a smoothie?
Heterogeneous
What can be used to represent a chemical reaction, using symbols and chemical formulas?
Chemical equation
Between Groups 2, 17, and 18. Which Group will react violently to Group 1?
Group 17
What type of change is a piece of bread toasting?
Chemical change
In which group would you put Hydrogen (H) ? ( Metals, nonmetals, and metalloids)
Non- metals
1. evaporate, filter, then add water
2. Add water, filter, then evaporate
3. Filter, evaporate, then add water
2.
When balancing this equation, what coefficient has to be put in front of the first Al?
4