WorksheetsChemistry (8.P.1.1/8.P.1.3) Test Review
Total questions: 66
Worksheet time: 45mins
This picture represents which of the following?
A single element
Mixture of molecules
mixture of atoms
mixture of compounds
The basic building blocks of most of the matter around you.
elements
protons
atoms
electrons
What does the total number of protons and neutrons in the nucleus determine?
The atomic number
the atomic mass
the number of electrons
the number of shells needed for all electrons
What subatomic particle determines the identity of an element?
number of electrons
number of protons
number of neutrons
number of atoms
Which of the following substances resents an element?
water
salt
trail mix
gold
What is the smallest unit of an element that still retains the element's properties?
proton
neutron
atom
molecule
protons are
located in the nucleus and have a positive charge
located in the nucleus and have a negative charge
the most important part of an atom
atoms
In an element
there are many different substances
the atoms are all the same
the atoms are all different
the electrons, protons and neutrons are located in the nucleus
Identify the heterogeneous mixture
sweet tea
salad
jello
gold
1 A substance made up of two or more chemically combined elements is —
an element
mixture
compound
solution
What does this illustrate
Elements
Compunds
Mixture of Elements and Compunds
Mixture of Compounds
This diagram represents a _____.
Element
Compound
Mixture of compound and element
Mixture of two elements
Brass is a metal that is bright red and gold. It is formed by combining, not chemically, two elements, zinc and copper. Based on the information, how would brass be classified?
an element
compound
mixture
suspension
Because an element can not be broken down into a simpler substance, it is considered to be
a chemical impurity
a chemical substance
a pure substance
unbreakable
Identify the homogeneous mixture
milk
trail mix
calcium
sugar
Which of the following is not a compound
aluminum (Al)
salt (NaCl)
water (H2O)
sugar (C6H12O6)
Carbon and oxygen combine chemically to form carbon dioxide. Carbon dioxide is
an ion
a nucleus
a compound
an atom
Which particle has a positive electrical charge?
proton
neutron
electron
Which of the three particles has the smallest mass?
proton
neutron
electron
Which particles make up the nucleus of an atom? (you can choose more than one answers)
proton
electron
neutron
Protons have a negative electrical charge
true
false
Electrons are found in the nucleus of the atom
true
false
Neutrons have the same mass as protons do
true
false
An example of a pure substance is
gold
salad
sweet tea
electron clouds
Solutions are ___________ mixtures.
Solid
Homogenous
Heterogeneous
Gas
one or two letters that represent the name of an element
element name
element symbol
atomic number
atomic mass
What does the C represent?
atomic mass
atomic number
element name
chemical symbol
A student passes a magnet over 10 grams of powder. Four grams of the powder stick to the magnet, while 6 grams do not. Which of these identifies the substance?
an element
a compound
a solution
a mixture
How many neutrons does oxygen have?
8
16
5
6
Look at Sodium (atomic number 11) on the Periodic Table. How many orbitals would it take to accommodate all Sodiums electrons?
1
2
3
4
How many valence electrons does Chlorine (Cl) have?
2
3
5
7
What do valence electrons determine about an atom?
how reactive it is
the identity of the atom
mass of the atom
phase of matter at room temp
A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is BEST supported by this observation?
A chemical change took place
The lithium was dissolved by the water
Dissolved gasses were released
Water was vaporized
A chemist observed bubbling and fizzing after adding an acid solution to a white powdery substance in a beaker. Which of the following can be inferred?
The acid boiled when poured into the beaker.
The acid and powder formed a new product.
A physical reaction produced a gas mixture.
A reaction occurred that produced heat.
As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?
using heat to burn a log in a fireplace
using light to produce sugar in plants
a cake that was baked from many ingredients
a bottle that was broken into many small pieces
When frozen carbon dioxide (CO2) is heated, it changes directly into a gas. Which statement BEST indicates that a physical change has taken place?
Heat caused an increase in gas production.
Heat caused a new substance to form.
Heat caused a decrease in energy.
Heat caused a change in state.
Which task in the kitchen is an example of a physical change?
frying an egg
baking a cake
toasting bread
melting butter
John and Lisa collected a sample of ocean water and placed it in a jar. Within a couple of days, the water had evaporated and salt was visible at the bottom of the jar. This is an example of a
chemical change
physical change
solute being dissolved
new substance being formed
What is needed to change ice into water?
air
energy
stirring
chemicals
Which is the BEST explanation of why heat is released when wood burns?
Burning creates energy by increasing particle motion.
Burning destroys matter and creates energy from it.
Burning releases energy stored in chemical bonds.
Burning causes convection currents which create heat energy.
Some power plants produce energy by burning coal. In these power plants, the heat from burning coal is used to boil water. Which statement BEST describes the changes that occur when burning coal and boiling water?
Burning coal and boiling water are both physical changes.
Burning coal and boiling water are both chemical changes.
Burning coal is a chemical change, and boiling water is a physical change.
Burning coal is a physical change, and boiling water is a chemical change.
Which statement BEST describes the formation of rust?
Rust results from a physical mixing of iron with water.
Rust forms from a chemical breakdown of old metal.
Rust results from a chemical reaction between iron and water.
Rust forms from a physical change when wind blows against metal.
Which of the following is an example of a PURE SUBSTANCE?
A only
A and B
C and D
A, B and C
Which is an example of a chemical reaction?
Water evaporates into air
Vinegar added to baking soda forms a gas
Sugar dissolves in water
Corn kernels are crushed to form flour
A student uses universal indicator pH paper and gets the following results. The substance that was tested is:
an acid
a base
neutral
a pure substance
In physical changes, substances might change in ________ but not in _______
appearance, composition
volume, state of matter
texture, color
weight, mass
A physical change can sometimes result in a color change. Which of the following situations shows this?
Milk turning yellow when it spoils
Dough becoming darker when its baked into a cookie
A red candy dissolves and turns water pink
A match turning black after its burned
Which of the following WILL NOT increase the speed of a reaction?
Increasing temperature
Increasing surface area
increasing the volume of a container
Adding a catalyst
What mixture could you use this tool to best separate that mixture?
Sugar and Salt
Sand and rocks
Apples and grapes
