Matter and Physical Properties
Periodic Table
Chemical Reactions
extra chemisrty
Compounds and Molecules
100
The smallest building block of matter.
an atom
100
There are over ______ elements on the periodic table.
100
100
Speeding up a reaction can be done by what temperature change
heating it
100
All matter is made up of
elements
100
Atoms joined as molecules share their _________
electrons (or valence electrons)
200
Anything that has mass and takes up space.
matter
200
The number of elements is increasing because of man made elements called
synthetic elements
200
Which one of these things would increase the rate of reaction? stirring it or cooling it
stirring it
200
If you start with 2.5 grams of Mg and combine it to 2.5 grams of O, how much would the product (MgO) mass/weight?
5 grams
200
When Na and Cl join together to form an ionic compound, which element steals the electron?
Cl
300
To calculate density, you need to measure the mass and divide by the volume. The density of water is
1 g/ml
300
The periodic table list elements according to their
number of protons or the atomic number
300
Atoms react with each other so they can have a full ______ shell.
valence
300
What LAW states: the mass of the reactants must be the same as the products in the chemical reaction
The law of conservation of mass
300
What do you call it when two or more atoms joined together
a molecule
400
Which one of these physical properties does not change no matter the amount of it you have. mass, volume, weight, density
Density
400
How many protons does nitrogen have
7
400
What is special about helium and makes it so stable it will not react with any other elements
valence electron shell is full
400
Is this chemical reaction 2Na + Cl2 --> 2NaCl a balanced or unbalanced equation?
balanced
400
If a molecule is made of two or more DIFFERENT elements it is called
a compound
500
What is the density of water if you have 5 liters of it?
1 g/ml
500
How many electrons does oxygen have
8
500
Fluorine has 7 valence electrons so it will need how many electrons from sodium to make a stable compound.
one
500
H2O (water) is a molecule because two nonmetals are sharing electrons in a ___________ bond.
covalent
500
Which of these are not compounds H2O NaCl CO2 O2 CH4 CO
O2
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