Mid Year 8th Grade Science Exam
High Point Academy-Mr. Zrinski
- 1.How many chemical bonds can each carbon atom form?
- A.
One
- B.
Two
- C.
Three
- D.
Four
- 2.A metal washer has a mass of 0.27g and a volume of 0.1 cubic centimeters. What is its density?
- A.
0.027 g/cubic centimeter
- B.
0.037 g/cubic centimeter
- C.
2.7 g/cubic centimeter
- D.
2.7 g/square centimeter
- 3.Electrons involved in bonding between atoms are...
- A.
Valence electrons.
- B.
Inside the nucleus.
- C.
Closest to the nucleus.
- D.
Positively charged.
- 4.Normal rainfall is slightly acidic, which means its pH must be...
- A.
Less than 2.
- B.
Between 5-7.
- C.
Between 2-4.
- D.
Between 7-9.
- 5.Explaining or interpreting the things you observe based on reasoning from what you already know is called...
- A.
Observing
- B.
Inferring
- C.
Predicting
- D.
Classifying
- 6.The first step in designing or redesigning a product is...
- A.
Thinking about ways to solve the problem.
- B.
Deciding what needs you are trying to meet.
- C.
Building a prototype.
- D.
Fully researching the problem.
- 7.If you heat a liquid and measure the temperature at which it boils, you are measuring a(n)...
- A.
Atomic property
- B.
Physical property
- C.
Chemical property
- D.
Molecular property
- 8.If a shoe box measures 6 cm high, 7 cm wide, and 20 cm long, what is its volume?
- A.
420 centimeters
- B.
420 cubic centimeters
- C.
840 cubic centimeters
- D.
840 centimeters
- 9.In a water solution, how do acids differ from bases?
- A.
Acids form hydrogen ions, while bases form hydroxide ions.
- B.
Acids turn litmus blue, while bases turn litmus red.
- C.
Acids form salts, but bases do not.
- D.
Hydrogen ions remain dissolved, but hydroxide ions do not.
- 10.A line graph shows...
- A.
Changes in the responding variable only
- B.
Changes in the manipulated variable only
- C.
How the responding variable changes in response to the manipulated variable.
- D.
How the manipulated variable changes on its own.
- 11.A well-tested explanation for a wide range of observations or experimental results is called a scientific...
- A.
Inquiry.
- B.
Hypothesis.
- C.
Theory.
- D.
Law.
- 12.What holds atoms together in a molecule?
- A.
Density.
- B.
Gravity.
- C.
Physical bonds.
- D.
Chemical bonds.
- 13.The number placed below an element's symbol in a chemical formula is called a ...
- A.
Subscript
- B.
Coefficient
- C.
Reactant
- D.
Product
- 14.One example of a chemical change is...
- A.
Filtering.
- B.
Burning wood.
- C.
Boiling water.
- D.
Crushing a can.
- 15.You can find the pH of a substance by using...
- A.
Plain paper
- B.
A thermometer.
- C.
Litmus indicator.
- D.
A conductivity tester.
- 16.What is the goal of technology?
- A.
To produce and deliver cereal.
- B.
To understand how the natural world functions.
- C.
To study the natural world.
- D.
To improve the way people live.
- 17.Fireworks exploding in the sky and giving off light are an example of a(n)..
- A.
Endothermic change.
- B.
Exothermic change.
- C.
Physical change.
- D.
Change in mass.
- 18.Which parts of the atom move around the nucleus?
- A.
Atomic mass units
- B.
Electrons
- C.
Protons
- D.
Neutrons
- 19.Which particles in an atom are in the nucleus?
- A.
Protons and neutrons
- B.
Protons and electrons
- C.
Protons and ions
- D.
Electrons and neutrons
- 20.When scientists put things into categories or group together items that are alike in some way, they are ....
- A.
Inferring
- B.
Predicting
- C.
Classifying
- D.
Making models
- 21.Table sugar and table salt are examples of
- A.
Atoms.
- B.
Elements.
- C.
Mixtures.
- D.
Pure substances.
- 22.The volume of an irregular object can be measured by...
- A.
Multiplying the object's length, width and height.
- B.
Dividing the object's density by its mass.
- C.
Submerging the object in water in a graduated cylinder.
- D.
Placing the object on a triple-beam balance.
- 23.What is a double bond?
- A.
A bond between two atoms.
- B.
One pair of electrons shared between two atoms.
- C.
Two pairs of electrons shared between two atoms.
- D.
Two pairs of electrons shared between four atoms.
- 24.What happens when chemical bonds break and new bonds form?
- A.
A physical change
- B.
A chemical reaction
- C.
Matter is destroyed
- D.
Surface area increases
- 25.Which is a likely use for a base?
- A.
As a vitamin in your food
- B.
Etching metals for printing
- C.
Making foods taste sour
- D.
Making soaps and detergents
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