NEW
Font size
WorksheetsFirst Semester Exam
Total questions: 43
Worksheet time: 22mins
Which of the following questions could be answered using the scientific method?
Does exercise affect your heart rate?
Does exercise affect your heart rate?
Should teachers make as much money as athletes?
Who is the most famous scientist in the world?
What is the independent variable in this question?
"Does the amount of moisture in a bag of microwave popcorn affect the number of kernels of popcorn that pop?
the type of bag
the amount of moisture
the number of kernels popped
the method of cooking
Why is it important to test only one variable at a time in an experiment?
changing only one variable eliminates that need for measurements
changing only one variable makes it possible to link changes to the independent variable
changing only one variable prevents a response in the dependent variable
changing only one variable produces results that cannot be trusted
Which of the following describes what repeated trials in an experiment allow scientists to do?
change their results at the last minute
choose different dependent variables
see the results over and over to ensure accuracy
test more than one hypothesis at a time
What is the smallest piece of gold that is still gold?
an atom of gold
a cell of gold
a molecule of gold
All the above
The nucleus of an atom consists of:
protons and electrons
neutrons alone
neutrons and electrons
protons and neutrons
Which of the following is an element?
salt
sugar
sodium
water
How can you tell a mixture from a compound?
You can separate a mixture using physical means, and you can only separate a compound using chemical means.
The mixture will dissolve in water but the compound will not.
The mixtures are malleable while compounds are brittle.
A compound will not break apart in a chemical reaction, but a mixture will break apart in a chemical reaction.
What does “malleable” mean?
the substance has a high density
the substance can dissolve in water
the substance can conduct electricity
the substance can be hammered into different shapes
Which of these statements describes a nonmetal?
A substance that is ductile, malleable, and is a good conductor
A substance that is brittle and dull
A substance that has a high density and is easily shaped
A substance that is very shiny
Nitrogen is an element with the symbol N. Which of the following is true about nitrogen based on its position on the periodic table?
it is chemically similar to Neon (Ne)
it is a nonmetal
it is a metal
it is a compound
Why is there a zigzag line in the periodic table of the elements?
It separates naturally occurring materials made in a lab.
It separates radioactive elements.
It separates metals from nonmetals.
It separates periods from families.
What elements are in the same family as Potassium (K)?
lithium (Li), sodium (Na), rubidium (Rb)
iron (Fe), calcium (Ca), and copper (Cu)
palladium (Pd), platinum (Pt), and darmstadtium (Ds)
calcium (Ca), Sodium (Na), and magnesium (Mg)
Which of the following substances is the most acidic?
baking soda, pH 9
coffee, pH 5
lemon juice, pH 2
oven cleaner, pH 13
Which of the following are properties of a base?
reacts with metals and feels slippery
tastes sour and feels slippery
feels slippery and turns litmus paper blue
tastes bitter and turns litmus paper red
Covalent bonding is:
the electrostatic attraction of ions due to the transfer of valence electrons.
the attraction of electrons toward the nucleus of an atom.
the attraction of protons to neutrons in the nucleus of an atom.
the sharing of valence electrons between two or more atoms.
What side of the equation is the reactants located?
Right
Left
Where the arrow is pointing
Behind the arrow
How do I identify a balanced equation?
Atoms of elements are equal on both sides
Each side of the equation has the same elements
All coefficients are the same on both sides
Does a balanced equation support the Law of conservation of Matter?
Yes
No
Maybe
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
There is no relationship.
The mass of products is greater than the mass of the reactants.
The mass of reactants is greater than the mass of the products.
The masses of the products and reactants are always equal.
Which of the following properties is a chemical property of matter?
malleability
flammability
conductivity
color
What two quantities must be known to calculate density of a sample of matter?
color and mass
mass and volume
length and mass
volume and texture
Which object has the highest density in a container of water?
The block floating
The block that in is half way from the bottom of the container
The block that is at the bottom of the container.
An unknown material has a mass of 6.75 g and a volume of 9 cm3. What is the density of the material? Round to the nearest tenth.
A. 1.3 g/cm3
B. 8 g/cm3
C. 0.7 g/cm3
D. 0.8 g/cm3
A
B
C
D
Justine won a trophy at the state spelling competition. She wants to know what kind of metal it is made out of, so she calculates the trophy's density. To find the trophy's density, Justine first weighs the trophy and finds that its mass is 860 g. To find its volume, she puts it in a large graduated cylinder filled with 500 mL of water, as shown below. When the trophy is added to the beaker, the water level changes to 650 mL, which is equal to 650 cm3. What is the density of the trophy?
129 g/cm3
1.72 g/cm3
5.73 g/cm3
1.32 g/cm3
Which of the following is a chemical change?
a glass vase breaking
grinding a substance into a powder
ice melting
paper burning
Jeff was trying to determine if his experiment involved a physical or chemical change. Which observation could mean that only a physical change had occurred?
A precipitate was formed
gas bubbles were produced
the state of the substances changed
the color of the substances changed
The sun comes out and the ice melts.
Physical Change
Chemical Change
Reddish-brown rust forms on a nail that has been sitting outside for days.
Physical Change
Chemical Change
Which of the following statements is part of the cell theory?
All cells come from pre-existing cells.
Cells are the basic units of living things.
All living things are made up of one or more cells.
all of these
All bacteria are harmful and never helpful.
True
False
A cell is classified as eukaryotic if the cell:
lives in the absence of oxygen.
does NOT go through mitosis.
contains chloroplasts.
contains a nucleus.
What is the job of the cell membrane?
To control what substances come into and out of the cell
To keep everything out of the cell
To make energy for the cell
To provide shape and support to the cell
What organelle is responsible for making energy?
Cytoplasm
Mitochondria
Nucleus
Vacuoles
What identifies as the storage for the cell?
Vacuole
Mitochondria
Nucleus
Chloroplast
What is the difference between plant and animal cells?
Plant cells have a nucleus; animal cells DO NOT.
Plant cells have a cell wall and chloroplasts; animal cells DO NOT.
Animal cells have mitochondria; plant cells DO NOT.
Animal cells have chloroplasts and a cell wall; plant cells DO NOT.
How are the vacuoles different in plant and animal cells?
plant cells have one large vacuole and animal cells have many small vacuoles, if any
plant cells have many small vacuoles and animal cells have one large vacuole
plant cells have many small vacuoles and animal cell do not have vacuoles
plant cells do not have vacuoles and animal cells have many small vacuoles
Cellular respiration occurs in all living cells. It is essential to life because it:
makes energy
provides oxygen
removes waste
stores water
We know that cells need energy to survive. What do cells use energy to do?
build cells
repair cells
reproduce single cell organisms
All the above
What organelle does photosynthesis occur
nucleus
vacuole
chloroplast
mitochondria
Which of the following is the job of mitosis in a human?
making food
allowing growth and replacing dead cells
defending cells against infections
making new humans
How do cells get rid of their waste?
photosynthesis
cellular respiration
mitosis
osmosis/diffussion
Why is photosynthesis essential to the survival of all living things?
it makes food
it makes carbon dioxide
it makes oxygen
both A and C
