46 questions
Each energy level of an atom has a maximum number of ______it can hold.
neutrons
protons
electrons
nuclei
Horizontal rows across the periodic table are called
groups
periods
clusters
element
A particle that moves around the nucleus of an atom is a(an)
proton
neutron
electron
element
The four diagrams below model the results of mixing atoms of different substances. Each atom is represented by a different symbol. Which diagram correctly models a chemical change creating a compound?
The positively charged particle in the nucleus of an atom is the
electron
proton
neutron
magnetron
The smallest part of matter is a (an)__________.
nuclues
molecule
atom
proton
Air is considered to be matter because it has
volume and length
protons and electrons
mass and takes up space
color and odor
The number of protons in the nucleus of an atom is called the
element number
mass number
atomic number
weight number
Which statement is a correct interpretation of the data in the graph?
As water temperature increases, solubility decreases.
As water temperature increases, solubility increases.
As water temperature increases, solubility increases and then decreases.
As water temperature increases, solubility decreases and then increases.
As the water temperature is increased from
30°C to 70°C, how many more grams of
substance A will dissolve in 100 grams of water?
*Only look at the line for Substance A- Look at the x-axis for 30°C and find the y-value.
to 70°C and find the y-value.
Subtract the two y-values to find how many more grams dissolves.
20g
50g
40g
90g
The property of being a semiconductor belongs to
noble gases
halogens
metals
metalloids
nuclei
protons
molecules
atoms
The substances that make up a mixture
keep most of their properties
lose most of their properties
are chemically combined
are combined in definite proportions
An example of a homogenous mixture is
oil and vinegar salad dressing
a mixture of salt and pepper
salt water
raisin bran cereal
Some common substances and their chemical formulas are listed in the chart below. Which of these substances are elements?
HINT- ONE Capital Letter = Elements
TWO Capital Letters = Compound!
hydrochloric acid and carbonic acid
carbon dioxide and water
oxygen and helium
water and oxygen
Plastic is used to cover the copper wires in the power cords of appliances because plastic differs from copper in:
*HINT- Copper is a metal (a good conductor...)
density
hardness
phase at room temperature
electrical conductivity
Elements in a group (family) on the periodic table have the same
number of energy levels
number of protons
number of valence electrons
number of protons and neutrons
The formula N2O means
1 atom of N, 2 atoms of O
2 atoms of N, 1 atom of O
3 molecules
2 atoms of N only
A scientist wants to remove and obtain the water from a mixture of salt water. What separation technique should be used?
magnetism
distillation
sieving
evaporation
Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles?
**Think about our Separating Mixtures Lab- how did you separate the iron from the mixture?
Use tweezers to separate them.
Use a magnet to separate them.
Add water to the mixture.
Pour the mixture into a filter.
A mixture of salt, sand, and water is thoroughly stirred. It is then filtered through a filter paper as shown in the diagram to the right. Which substances(s) pass through the filter?
Hint! Think about the Separating Mixtures Lab we did. What happened when you did this?
only the water
only the water and the sand
only the water and salt
the sand, salt and the water
In a solution, the part of the solution that does the dissolving is known as the...
(the one doing the dissolving, not the solid being dissolved)
solute
solvent
water
homogeneous
The property of metal that allows it to be made into a wire is known as
conductor
luster
malleable
ductile
Sodium with a valence electron of 1 will join with Chlorine because Chlorine has
1 valence electron
7 valence electrons
8 valence electrons
18 valence electrons
All of the following are characteristics of both compounds and mixtures except
Compounds and mixtures contain different substances.
Compounds and mixtures can be separated into their different parts using different methods.
The materials that make up compounds and mixtures lose their
characteristics when combined.
Compounds and mixtures can contain more than 2 elements.
The picture shows a method of separating a mixture. Choose the best method for separation for the mixture below.
You can select TWO answers, if applicable!
mixture of sand and water
sea water to obtain the salt
sand and rocks of different sizes
iron filings and sulfur
mixture of sugar and water
What mixture would this method be used to separate?
mixture of sand and water
sand and rocks of different sizes
iron filings and sulfur
mixture of sugar and water
Which mixture would this method be used to separate?
mixture of sand and water
sea water to obtain the salt
sand and rocks of different sizes
iron filings and sulfur
mixture of sugar and water
Which mixture would this method be used to separate?
mixture of sand and water
sea water to obtain the salt
iron filings and sulfur
mixture of sugar and water
When a balloon is rubbed on a wool sweater, the balloon builds up a negative electrical charge. When a glass rod is rubbed on silk, the rod builds up a positive electrical charge. Explain why the charged balloon will be attracted to the charged glass rod.
Opposites attract
Likes repel
They are neutral
Identify the elements that has chemical properties similar to the chemical properties of fluorine.
You should select more than one answer!
Bromine
Neon
Oxygen
Chlorine
Iodine
Which elements are metals?
*You can select more than one answer.
Cd
Cu
Br
P
Which elements are nonmetals?
Br
Cd
Cu
P
In which group of the Periodic Table of the Elements are the noble gases located?
Group 1
Group 2
Group 17
Group 18
The diagram below shows the arrangement of atoms and the chemical composition of a water molecule. The table shows common elements and their chemical symbols. What two elements make up the water molecule?
Helium and Oxygen
Calcium and Hydrogen
Hydrogen and Oxygen
Carbon and Oxygen
How many grams of the solid solute will dissolve in 100 grams of water at 25°C?
30 g
40 g
38 g
31 g
Describe the relationship between water temperature and the solubility of the gaseous solute from 0°C to 15°C.
As the temperature increases, the solubility increases
As the temperature increases, the solubility decreases
As the temperature increases, the solubility remains constant
Select the ways to increase the rate (speed) at which a solid solute dissolves in 100 grams of water.
*You may select more than one answer
heat it (increase heat)
shake it, stir it (increase motion)
freeze it (decrease heat)
crush it (increase surface area)
let it settle (decrease motion)
Elements that have some characteristics of metals and some characteristic of non-metals are called:
noble gases
elements
metalloids
transition metals
The atomic number of an atom is determined by the number of
protons
electrons
neutrons
valence electrons
The modern periodic table is organized according to
chemical symbols
atomic number
atomic weight
the alphabet
Which of the following elements is the best conductor of electricity?
Carbon (C)
Sulfur (S)
Oxygen (O)
Copper (Cu)
Which element from this portion of the table chemically reacts in a way similar to the way the element chlorine (Cl) reacts?
Si
Xe
O
I
Which element is classified as a noble gas?
Sulfur (S)
Argon (Ar)
Oxygen (O)
Nitrogen (N)
Because copper is a metal, it is
liquid at room temperature
nonreactive with our substances
a poor conductor of electricity
a good conductor of heat
These particles are located in the nucleus of an atom:
electrons and neutrons
protons and electrons
neutrons, protons, and electrons
neutrons and protons