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Worksheets1st Nine Weeks Test
Total questions: 26
Worksheet time: 35mins
If particle 1 is a proton, which particle would represent a neutron?
2
3
1
none of the them
The subatomic particles of an atom are the protons, neutrons, and electrons. Which of these are located in the nucleus
protons and electrons
electrons and neutrons
protons and neutrons
all of them
How many protons, neutrons, and electrons are present in an atoms of hafnium, Hf, with a mass number of 178? (use your periodic table reference sheet)
72 protons, 178 neutrons, 106 electrons
72 protons, 106 neutrons, 72 electrons
178 protons, 250 neutrons, 72 electrons
106 protons, 72 neutrons, 106 electrons
Which statement below is true?
The compound is made up of multiple atoms.
This element is made up of two different atoms.
It is an allotrope representing a hydrobromide ion.
This structural geometry shows elemental bromide.
In the classification of matter chart, letter B. would be a(n)
acid
base
compound
element
Elements are composed of
many types of atoms.
the same types of atom.
many different compounds.
the same type of compound.
During an investigation, a student combined the two clear, colorless solutions shown above:
The student observed that the temperature changed from 25◦C to 23◦C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
One of the original compounds came out of solution.
Some of the water froze into ice crystals
Rapid evaporation of water occurred, leaving a solid.
The solutions reacted chemically.
Many processes occur in the digestive system. Which process is best classified as a physical change?
Saliva converting the starch molecules in crackers into simple sugars
Digestive enzymes breaking down proteins into smaller fragments
Bacteria converting lactose into simple sugars in the intestines
Teeth grinding an almond into pieces
A student is conducting an investigation to observe chemical reactions. The student obtains two strips of magnesium, Mg, ribbon that are each 3 cm long. One strip of magnesium is placed in a test tube containing 5 mL of water. The other strip of magnesium is placed in a test tube containing 5 mL of hydrochloric acid, HCl.
Both liquids are at room temperature.
The student’s observations are recorded in the table. Which statement is not supported by the student’s observations?
A chemical reaction takes place between magnesium and hydrochloric acid.
A gas is released in Test Tube 2.
The substances in both test tubes are reactive only at high temperatures.
Energy is released in the reaction involving hydrochloric acid.
The chemical formula of magnesium sulfate is MgSO4. Two molecules of magnesium sulfate (2MgSO4) has _____.
four atoms of oxygen (O)
four atoms of silicon (Si)
two atoms of magnesium (Mg)
two atoms of oxygen (O)
Hydrogen peroxide is commonly used to clean cuts and wounds. Its chemical formula is H2O2. This compound has _____.
two atoms of hydrogen
three atoms of oxygen
three atoms of hydrogen
one atom of oxygen
Landon's new toy arrived in the mail covered in foam packing peanuts. The foam packing peanuts have a mass of 30 g and a volume of 60 cm3. What is the density? D=M/V
2 g/cm3
180 g/cm3
0.5 g/cm3
2
Solution X and Solution Y are combined in a third beaker. A solid is formed, as shown below.
Which information can be used to find out if the total mass of the substances is same before and after the reaction?
The total mass of the substances after mixing
The total mass of the substances before mixing
The total mass of the substances and beakers after mixing
The total mass of the substances and beakers before and after mixing
Milk turning sour is an example of a _____ change. Use the Changes in Matter reference guide to help you find your answer.
physical
chemical
Which of the following is a physical change?
chopping a piece of wood
burning a piece of paper
lighting a match
a rusting nail
For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored in the beaker on a shelf overnight. The next morning, the students record observation about the metal and the solution in the box above.
Based on their observation, can the students correctly conclude that a chemical reaction occurred?
No, because the metal strip was still visible.
Yes, because a new material of a different color formed on part of the metal strip.
No, because the solution stayed blue.
Yes, because the volume of the blue solution stayed the same.
When electricity passes through water, hydrogen and oxygen are produced. Which table correctly labels the compounds and elements involved in the process?
Water-->Compound
Hydrogen-->Compound
Oxygen--->Element
Water--->Compound
Hydrogen--->Element
Oxygen--->Element
Water-->Compound
Hydrogen--->Element
Oxygen--->Compound
They are all elements.
Which equation is balanced?
P + O2 ---> PO2
P + O ---> 2P2O5
P + 5O2 ---> 2PO
P2O5 ---> P2 + O2
Sulfur hexafluoride, SF6, is a very stable, nonflammable gas at room temperature. It is used in many electronic products because it is a good electrical insulator. Which statement describes the composition of sulfur hexafluoride?
Sulfur hexafluoride is a compound containing atoms of sulfur and fluorine.
Sulfur hexafluoride is a compound that contains seven identical atoms.
Sulfur hexafluoride is an element with sulfur in the atom’s nucleus and fluorine outside the nucleus.
Sulfur hexafluoride is an organic compound composed of long chains of sulfur atoms surrounded by fluorine atoms
According to the Law of Conservation of Mass, how many grams of hydrochoric acid are needed?
2H2 + Cl2 ---> 2HCl
15g + 20g ---> ____g
5g
35g
25g
10g
Which animal has a life span closest to that of sheep?
dog
cat
horse
cow
Crickets chirp to attract other crickets. The temperatures and rates of their chirping are graphed above. Which statement below is most likely true for the data represented in the graph?
The cooler the temperature, the louder the crickets chirp.
The crickets cannot chirp at temperatures lower than 10 degrees C.
The warmer the temperature, the more often crickets chirp.
The temperature and the chirping of crickets are not related.
The line graph shows the heights of plants grown in fertilized and unfertilized soil. Based on this information, what will most likely occur on day six?
Neither plant should increase by 1 cm in height.
Plant A should increase about 1 cm in height.
Plant B should increase about 1 cm in height.
Plant A should increase about 2 cm in height.
Letter "A" is pointing to the...
reactants
yield arrow
products
Letter "C" is pointing to the...
Reactants
Yield Arrow
Products
Letter "B" is pointing to the...
Reactants
Yield Arrow
Products
