8th Grade Science TCAP Review: Question Preview (ID: 18885)


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The chemical reaction below describes the combustion of ethanol. C2H5OH + 3O2 → 2CO2 + 3H2O What are the products of the reaction?
a) C2H5OH and 3O2 b) C2H5OH and 2CO2 c) 3O2 and 3H2O d) 2CO2 and 3H2O
The planets in our solar system stay in their orbits because of the __________.
a) force of gravity on their masses b) energy that makes up the Van Allen belts c) force of magnetism on their iron cores d) energy from the Sun that brings warmth
Which of the following does not represent a mixture?
a) NaCl + H2O b) Fe2O3 c) N2 + O2 d) SiO2 + C6H12O6
Which of the following would not be used to construct an electromagnet?
a) a directional compass b) a size D battery c) a steel nail d) a coil of copper wire
In what state of matter are the molecules far apart and constantly moving at high speeds?
a) solid b) liquid c) gas d) matter
Carrie tests the stream behind her house each year to find out if the water quality has changed. This year, the water in the stream had a pH of 6.0 according to the pH meter. What describes the pH of the water in the stream?
a) strongly acidic b) slightly acidic c) strongly basic d) slightly basic
Hernando ran an electric current through a beaker of distilled water and separated the water into the gases H2 and O2. What type of change did he produce?
a) periodic change b) social change c) chemical change d) physical change
On the periodic table, chromium has the symbol Cr, an atomic number of 24, and a mass number of 52. How many protons does chromium have?
a) 24 b) 28 c) 52 d) 76
Which of these represents a chemical change?
a) sugar dissolving in water b) water vapor rising in the air c) rocks cracking due to freeze and thaw d) salt forming after mixing two liquids
What are carbon, hydrogen, and oxygen?
a) cells b) atoms c) acids d) bases
Which sentence describes a way that Earth's biodiversity helps human health?
a) Many species participate in the water cycle and clean water as it moves through the ocean and atmosphere. b) Many species transmit disease organisms and this helps humans develop resistance to many kinds of illness. c) Many scientists study species in the wild and more species mean more discoveries for the scientists. d) Many medicines are derived from plants and animals and more are being discovered as new species are found.
Charity was measuring a sample of copper to determine its density. The sample had a mass of 27 grams and a volume of 3 cubic centimeters.What is the density of copper?
a) 3 grams per cubic centimeter b) 6 grams per cubic centimeter c) 9 grams per cubic centimeter d) 12 grams per cubic centimeter
Which animal species are most likely to survive in a marine environment that has very cold water temperatures?
a) animals that use sound to navigate b) animals that live together in social groups c) animals that have colorful markings on their skin d) animals that have a thick layer of fat beneath their skin
Which objects could be combined to make a device that would produce electricity?
a) a graduated cylinder and a gram scale b) a magnet and a coil of copper wire c) a block of ice and a dark metal box d) a magnifying lens and a source of light
Earth's atmosphere is made up of several gases. Which gas makes up over 75% of Earth's atmosphere?
a) helium b) hydrogen c) nitrogen d) carbon dioxide
Why does Earth have a greater gravitational pull than the Moon?
a) The Moon orbits Earth. b) Earth has more mass than the Moon. c) Earth has magnetic poles. d) The Moon is farther from the Sun.
Several exploration vehicles have landed on Mars and have sent information back to scientists on Earth. Which characteristic changed after the vehicles landed on Mars?
a) The vehicles weighed much less on Mars. b) The vehicles had much less mass on Mars. c) The vehicles were much longer on Mars. d) The vehicles were much warmer on Mars.
Which statement describes a difference between a bar magnet and an electromagnet?
a) A bar magnet has no magnetic field, while an electromagnet has a very strong magnetic field. b) A bar magnet has a very strong magnetic field, while an electromagnet has no magnetic field. c) A bar magnet has a temporary magnetic field, while an electromagnet has a permanent magnetic field. d) A bar magnet has a permanent magnetic field, while an electromagnet has a temporary magnetic field.
Molecules consist of two or more __________.
a) atoms b) protons c) neutrons d) electrons
What is the result of all chemical changes?
a) A substance goes through a phase change. b) An element loses electrons. c) A new substance is formed. d) A new element is formed.
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