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Worksheets8th Grade Chemistry Quiz
Total questions: 50
Worksheet time: 25mins
Which group on the periodic table has the greatest number of metallic elements?
Group 2 (IIA)
Group 7 (VIIB)
Group 13 (IIIA)
Group 18 (VIIIA)
Why are the noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?
They are nonreactive gases.
They are highly reactive metallic solids.
They are dangerous gases when combined with water.
They are liquid at room temperature and have high boiling points.
In which group are the most reactive metals located?
Group 1 (IA)
Group 2 (IIA)
Group 17 (VIIA)
Group 18 (VIIIA)
Which best describes elements on the far right side of the periodic table?
Gas
Liquid
Dense
Malleable
Which best describes how the physical properties of elements generally vary across a period?
The elements on the left side of a period have nonmetallic properties, while the elements on the right side of a period have metallic properties.
The elements on the left side of a period have metallic properties, while the elements on the right side of a period have nonmetallic properties.
The elements on the left side of a period have both metallic and nonmetallic properties, while the elements on the right side of a period have metallic properties.
The elements on the left side of a period have nonmetallic properties, while the elements on the right side of a period have both metallic and nonmetallic properties.
What category of elements is found along the bold staircase line between the metals and nonmetals on the periodic table?
Noble gases
Metals
Metalloids
Nonmetals
Several samples of elements are placed on a lab table for students to observe. In his laboratory report, Jonathan records, 'Sample 1 is a shiny wire.' Which element is most likely sample 1?
Bromine (Br)
Hydrogen (H)
Oxygen (O)
Zirconium (Zr)
Which property do metalloids share?
Conductive
Semiconductive
Nonreactive
Highly reactive
Which category contains the majority of elements on the periodic table?
Lanthanides
Metalloids
Nonmetals
Metals
Which group of elements contains the most reactive metals?
alkaline earth metals
transition metals
metalloids
alkali metals
Which substance is most likely to react with water in a similar way to sodium (Na)?
Hydrogen (H), because it's in the same group as sodium on the periodic table
Lithium (Li), because it's in the same family as sodium on the periodic table
Argon (Ar), because it's in the same period as sodium on the periodic table
Magnesium (Mg), because it's beside sodium on the periodic table
Which element most likely has similar physical properties to potassium (K)?
Arsenic (Ar)
Bromine (Br)
Krypton (Kr)
Sodium (Na)
Baking soda and vinegar are mixed together in a sealed plastic bag. The chemicals bubble and the bag expands. Which conclusion can be made from these observations?
There was a chemical change, and a precipitate was formed.
There was a physical change, and a precipitate was formed.
There was a chemical change, and a gas was produced.
There was a physical change, and a gas was produced.
After a scientist mixes two clear solutions, he is unable to detect a temperature change. However, he knows a chemical change occurred. Which evidence best proves a chemical change did indeed occur?
There was an increase in the mass of the new solution produced.
A solid precipitate was produced which settled out of the solution.
There was a decrease in the volume of the new solution produced.
Two distinct layers were observed when the two original solutions were combined.
The process of rusting is related to which property of iron?
density
malleability
chemical reactivity
electrical conductivity
Which indicates a physical change?
change in state
release of heat
formation of a precipitate
formation of a new substance
Which best explains the reaction shown below? CH4 + 2O2 → CO2 + 2H2O
a physical change, because the reaction produced the same substances
a chemical change, because the reaction produced two different substances
a chemical change, because the products and the reactants are the same substances
a physical change, because the products and reactants are two different substances
Which information best determines the location of an element on the periodic table?
size
color
properties
date of discovery
Which of the following elements is most reactive with a Group 17 (VIIA) element?
calcium (Ca)
helium (He)
lithium (Li)
lead (Pb)
Which trend occurs as elements progress from left to right on the periodic table?
Elements go from less magnetic to more magnetic.
Elements go from more metallic to less metallic.
Elements go from more gaseous to more solid.
Elements go from less dense to more dense.
Which is the simplest substance?
oil
salt
sulfer
water
Which best describes the splitting of water molecules into hydrogen and oxygen atoms?
a chemical change in which bonds are broken
a chemical change in which bonds are created
a physical change in which bonds are broken
a physical change in which bonds are created
Which is an example of a physical change within a system?
baking a cake
burning a piece of paper
water turning into steam
baking soda reacting with vinegar
Hydrogen (H) and Carbon (C) are metals
TRUE
FALSE
Silicon (Si) and Boron (B) are metalloids
TRUE
FALSE
When heated, copper metal will become a liquid at 1,084°C. Which property of the metal has been described?
density
reactivity
malleability
melting point
Lithium (Li) and Potassium (K) are metals
TRUE
FALSE
When two solutions are combined, which evidence would best indicate a chemical reaction has occurred?
Temperature remains constant
A precipitate forms
Density decreases
Volume increases
Which reaction shows a conservation of atoms?
H2 + O2 → H2O
Na + Cl2 → NaCl
N2 + 3H2 → 2NH3
2Al + O2 → Al2O3
When oxygen (O) reacts with iron (Fe), it produces rust (Fe O ). In a closed system, how much oxygen must react with 120 grams of iron to produce 580 grams of rust?
120 grams
460 grams
580 grams
700 grams
Only the coefficient can be changed in a chemical equation
FALSE
TRUE
In the Law of Conservation of Mass for chemical reactions, what is the relationship between the products and the reactants?
The total mass of the products equals the total mass of the reactants.
The total mass of the products is less than the total mass of the reactants.
The total mass of the products is greater than the total mass of the reactants.
The total mass of the products is not directly related to the total mass of the reactants.
Which classification best fits the chemical Al2O3?
compound
element
mixture
molecule
Which is the best description of a solution?
element
compound
homogeneous mixture
heterogeneous mixture
Which best describes sodium chloride (NaCl)?
a mixture which is physically produced
a mixture which is chemically produced
a compound which is physically produced
a compound which is chemically produced
Which best describes a compound?
It is a type of heterogeneous mixture.
It cannot be broken down into simpler substances.
It is composed of two or more atoms of the same element that have
been physically mixed together.
It is composed of two or more atoms of different elements that have
been chemically combined together.
Water breaks down into hydrogen and oxygen as shown in the balanced
equation below.
2H2O → 2H2 + O2
Which best supports the Law of Conservation of Mass?
The amount of hydrogen is doubled during the reaction.
1 atom of oxygen appears on both sides of the equation.
4 atoms of hydrogen appear on both sides of the equation.
2 molecules of water break down into 2 hydrogen and 2
oxygen molecules.
Which equation supports the Law of Conservation of Mass?
Zn + 2HCl → ZnCl2 + H2
CH4 + O2 → 2H2O + CO2
H2 + 2O2 → 2H2O
Al + o2 → Al2O3
Which is true about chemical reactions?
Energy is changed into atoms.
Atoms are changed into energy.
Atoms are created and destroyed.
Atoms are rearranged in the product.
Subscripts can be changed in a chemical equation
TRUE
FALSE
The coefficient is the number to the right of the element in a chemical equation
TRUE
FALSE
All matter is made of...
elements
substances
atoms
compounds
The formula H2ON3Ca has how many atoms
8
5
7
6
A change in a solid, liquid or a gas would indicate what type of change?
physical change
chemical change
sublimation
condensation
Examples of chemical changes would be burning, cooking, rusting, and rotting.
TRUE
FALSE
Examples of physical changes could be boiling, melting, freezing, and shredding
TRUE
FALSE
3Br3HB2 has how many elements
3
2
4
I don't know
The #4 in 4HN2Ca3 would be the...
subscript
number of atoms
coefficient
problem
Is the following formula is balanced:
H2 + O → H2O
TRUE
FALSE
I have no idea
The #2 in 5H2B3N would be the...
answer
coefficient
subscript
number of people I like
