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WorksheetsChemistry Assessment Preparation 1
Total questions: 30
Worksheet time: 31mins
If there are 10 grams of reactant, how many grams of product are produced by a chemical reaction?
2 grams
4 grams
8 grams
10 grams
A reaction between 1 molecule of CH4 and 2 molecules of O2 should produce....
1 carbon, 1 hydrogen, and 1 oxygen
1 carbon, 1 hydrogen, and 2 oxygen
1 cqrbon, 4 hydrogen, and 2 oxygen
1 carbon, 4 hydrogen, and 4 oxygen
In the picture shown, what does the number 20 represent?
The atomic number
The number of protons
The equivalent number of electrons
all of the above
In the picture, what does the number at the bottom of the box represent?
the number of protons
the number of protons and neutrons
the number of neutrons
the number of electrons
The columns in a periodic table that go up an down are called...
family/ groups
periods
periodic series
atomic series
Covalent bonds form when
metal atoms bond together.
nonmetal atoms bond together.
metals and non-metals bond together.
noble gases bond together.
What period/row is Arsenic (As)?
Period 5, Group 4
Period 4, Group 5
How many valance electrons does iodine have?
If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
a) 12 atoms of carbon
b) 6 atoms of carbon
c) 3 atoms of carbon
d) 2 atoms of carbon
A compound containing potassium (K), chlorine (Cl) and oxygen (O) has the chemical formula KClO3. Which best represents a balanced chemical reaction showing the breakdown of KClO3 into simpler substances?
a) 2KClO3 -> 2KCl
b) 2KClO3 -> Cl2 + 3O2
c) 2KClO3 -> 2K + 3O2
d) 2KClO3 -> 2KCl + 3O2
Why are noble gases such as helium (He) and neon (Ne) grouped together on the Periodic Table?
a) They are non-reactive gases.
b) They are highly reactive metallic solids.
c) They are dangerous gases when combined with water (H2O).
d) They are liquid at room temperature and have high boiling points.
A chemist combines 37 grams of iron (Fe) with 16 grams of oxygen (O2). Based on the Law of Conservation of Mass, what will the resulting mass of iron oxide (FeO) be?
a) 21 grams
b) 53 grams
c) 69 grams
d) 592 grams
Which of the following is an example of a compound?
a) O2
b) 2Cl
c) H2SO4
d) Hydrogen
You can figure out how many protons an element has by...
Looking at the atomic number.
Looking at the atomic mass.
Subtracting the atomic mass and atomic number.
Adding the atomic mass and atomic number.
You can figure out how many neutrons an element has by...
Looking at the atomic number.
Looking at the atomic mass.
Subtracting the atomic mass and atomic number.
Adding the atomic mass and atomic number.
What is the atomic number of iron?
26
55.845
29.845
81.845
Look at the chemical equation.
How many atoms of mercury (Hg) are in the reactants?
(a)
Look at the chemical equation.
How many atoms of oxygen (O) are in the reactants?
(a)
A subatomic particle that has no charge and that is found in the nucleus of an atom
electron
neutron
shell
proton
Lithium's valence shell holds _________ electron(s)
1
2
3
4
What happened to the sodium atom (left picture) to make it a sodium ion (right picture)?
The sodium atom gained one electron
The sodium atom gained two electrons
The sodium atom lost one electron
The sodium atom lost two electrons
P4+O2 --> P2O3
The second shell from the center of an atom can hold how many electrons?
2
6
8
18
