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WorksheetsCHEMISTRY STAAR REVIEW
Total questions: 23
Worksheet time: 35mins
Name
Class
Date
1.
Which subatomic particle has a positive charge?
a)
Electron
b)
Neutron
c)
Proton
d)
All of the above
2.
Which is the smallest subatomic particle with the least amount of mass?
a)
Proton
b)
Electron
c)
Neutron
3.
Which subatomic particle has no charge?
a)
Proton
b)
Electron
c)
Neutron
4.
What do you call a vertical (up and down) column on the Periodic Table of Elements?
a)
Periods/Rows
b)
Metals/Nonmetals
c)
Groups/Families
d)
Halogens/Noble Gases
5.
What group of elements are on the "staircase" of the periodic table of elements?
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Halogens
6.
What does the atomic number of an element tell you?
a)
the atomic mass
b)
the number of protons and electrons
c)
the number of neutrons and protons
d)
the number of electrons and neutrons
7.
Mass number =
a)
electrons + protons
b)
electrons + neutrons
c)
protons + neutrons
d)
protons + neutrons + electrons
8.
If the atomic number of an element is 12, what do you know?
a)
There are 6 protons and 6 electrons
b)
There are 12 electrons and 6 neutrons
c)
There are 12 protons and 12 electrons
d)
There are 6 electrons and 6 protons
9.
If an element has two energy levels (orbitals), what period is it in?
a)
1
b)
2
c)
3
d)
4
10.
An element has three energy levels (orbitals). What period is this element in?
a)
1
b)
2
c)
3
d)
4
11.
Which subatomic particle(s) is/are found outside the nucleus?
a)
Protons only
b)
Electrons only
c)
Neutrons only
d)
Protons and Neutrons
12.
Subatomic particle with a negative charge.
a)
proton
b)
electron
c)
neutron
13.
What is the term for the particles in red?
a)
Protons
b)
Electrons
c)
Valence electrons
d)
Positive protons
14.
What is the mass number of a potassium (K) atom that has 20 neutrons?
a)
18
b)
19
c)
20
d)
39
15.
What types of particles are found in the cloud surrounding an atom's nucleus?
a)
Positively charged particles and negatively charged particles
b)
Negatively charged particles only
c)
Neutral particles and positively charged particles
d)
Positively charged particles only
16.
A group of elements is described by a student as being shiny, solid at room temperature, and having two valence electrons.
Which of these elements is in this group?
Which of these elements is in this group?
a)
Lithium
b)
Strontium
c)
Aluminum
d)
Silicon
17.
Which property of an unknown element determines the other elements it reacts with?
a)
The total number of neutrons of the unknown element
b)
The total number of particles in the nucleus of the unknown element
c)
The number of protons of the unknown element
d)
The number of valence electrons of the unknown element
18.
A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?
a)
Nitrogen (N)
b)
Sulfur (S)
c)
Arsenic (As)
d)
Silicon (Si)
19.
Which particles give the identity of an atom?
a)
Protons
b)
Neutrons
c)
Electrons
d)
Valence electrons
20.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes.
b)
Oxygen is present.
c)
A new substance is produced.
d)
Coal is made up of more than one element.
21.
Which of the following describes a chemical change?
a)
Biting into an apple.
b)
Teeth breaking down a bite of apple into smaller chunks.
c)
The molecules in the bits of apple being broken down into smaller compounds.
d)
The esophagus squeezing the chewed apple as it is swallowed.
22.
This diagram shows the structure of an organic compound called urea. Urea is a waste product that organisms, including humans, excrete. Why is urea classified as an organic compound?
a)
Because it contains carbon.
b)
Because it contains oxygen.
c)
Because it is found in living organisms.
d)
Because it is a waste product that is excreted.
23.
In the chemical reaction shown below, the products are best classified as -
CaCO3 ---> CaO + CO2
CaCO3 ---> CaO + CO2
a)
two elements
b)
one element and one compound
c)
two compounds
d)
two compounds and one element
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