# 8th Grade Science TCAP Review 2: Question Preview (ID: 18898)

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How is mass different from weight?
a) Weight is the length, width, and height of an object, and mass is the density of an object.
b) Mass is the length, width, and height of an object, and weight is the density of an object.
c) Weight is the amount of matter in an object, and mass is the amount of gravitational attraction an object has.
d) Mass is the amount of matter in an object, and weight is the amount of gravitational attraction an object has.

Heat was applied to 500 milliliters of water until the temperature of the water reached 100 °C. What change happened to the water when it reached 100 °C?
a) The water molecules began to separate into free hydrogen and oxygen
b) The water molecules began to lose the particles inside their atoms.
c) The water molecules began chemically changing to a new substance.
d) The water molecules began physically changing to another phase.

A substance with a pH of 9.2 is ________.
a) an acid
b) a base
c) neutral
d) frozen

The mass of 5 cubic centimeters of aluminum is 13.5 grams. What is the density of aluminum?
a) 2.7 g/cm3
b) 8.5 g/cm3
c) 13.5 g/cm3
d) 18.5 g/cm3

Mr. Parsons is helping his science class build a device that will produce electricity with a rotating magnet. What else must be included in the device in order for it to produce electricity?
a) resistor
b) light bulb
c) battery
d) coil

The following chemical equation represents the decomposition of ammonia. 2NH3 -- 3H2 + N2 Which of the following is true in all chemical reactions that result in decomposition?
a) The mass of the products is less than the mass of the reactants.
b) The mass of the products is equal to the mass of the reactants.
c) The mass of the products is greater than the mass of the reactants.
d) The mass of the products is not related to the mass of the reactants.

Organisms that live in coastal areas must be able to survive living in both dry conditions with no water, as well as wet conditions while they are under water. Which traits would provide it with the best chance for long term survival?
a) a thick coat of fur that blocks out water very well
b) a soft body that does not absorb water very well
c) a hard body that absorbs and releases water equally well
d) a strong dorsal fin that allows it to swim well in low temperatures

Which of these is an adaptive bioengineered product?
a) leg braces
b) nitrogen filled packages
c) mechanical harvesters
d) drought resistant corn

Which of the following will react to form a new compound when mixed?
a) baking soda and water
b) baking soda and vinegar
c) salt and water
d) salt and pepper

Which substance is a compound?
a) O3
b) Cl2
c) CH4
d) N2

Which substance is not a natural component of Earth's atmosphere?
a) O2
b) N2
c) CO2
d) NaOH

Which of the following has the largest magnetic field?
a) bar magnet
b) electromagnet
c) compass
d) Earth

A substance with a pH of 2.3 is ________.
a) neutral
b) a base
c) an acid
d) solid

In which state of matter are molecules closest together with the least amount of movement and heat?
a) gas
b) liquid
c) solid
d) plasma

object could not be used to test an electromagnet to find out if it is working?
a) compass
b) magnet
c) steel key
d) glass prism

Samantha is building an electric motor using a magnet and a length of thick wire. What shape must the wire have in order for her motor to work?
a) straight
b) coiled
c) square
d) wavy

A team of astronomers observed two asteroids of equal mass traveling through our solar system. Which asteroid will be most attracted by Earth's gravity?
a) The asteroid that is closest to Earth.
b) The asteroid that is farthest from Earth.
c) The asteroid that is traveling at the fastest speed.
d) The asteroid that is traveling at the slowest speed.

The same cylinder was used to calibrate a spring scale, which measures the weight of an object. The calibrated spring scale displays 350 grams based on Earth's gravity. What would this spring scale display under Jupiter's gravity?
a) 87.5 g
b) 133.0 g
c) 350.0 g
d) 875.0 g

Look at the chemical reaction for water. 2H2 + O2 → 2H2O How does combining hydrogen and oxygen to create water relate to the law of conservation of mass?
a) A smaller mass of hydrogen is in water than existed originally.
b) No mass is lost in combining them to make water.
c) The combination has greater mass than the original parts.
d) Small amounts of hydrogen and oxygen are burned.

Which gas makes up about 20% of Earth's atmosphere?
a) nitrogen
b) carbon dioxide
c) oxygen
d) helium

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