REVIEWER SCIENCE

Front

Which of the following statements BEST describes matter? It has weight., It is a form of energy., It has a definite shape., It occupies space and has mass.

Back

It occupies space and has mass.

Answer explanation

The best description of matter is that it occupies space and has mass. This definition encompasses all forms of matter, while the other options are either incomplete or not universally applicable.

Front

Which is NOT an example of matter? air, chalk, sound, water

Back

sound

Answer explanation

Sound is NOT matter because it is a form of energy that travels in waves, while air, chalk, and water are all physical substances that have mass and occupy space.

Front

Which of the following sets of samples below is matter? Options: air, water, love; idea, chair, chalk; crayon, air, juice; light, shadow, feeling

Back

crayon, air, juice

Answer explanation

Matter is anything that has mass and occupies space. Among the options, 'crayon' (solid), 'air' (gas), and 'juice' (liquid) are all forms of matter, while the others include non-material concepts like love and ideas.

Front

Which of the following given sets of samples are solids? Options: stone, nail, pen; ice, water, crayon; radio, car, gasoline; oxygen, stone, ice cream

Back

stone, nail, pen

Answer explanation

The correct choice is 'stone, nail, pen' as all these items are solids. Ice is a solid but can melt into water, and gasoline and oxygen are liquids and gases, respectively.

Front

Which pair of states of matter has indefinite shape?

Back

liquid and gas

Answer explanation

Liquids and gases both have indefinite shapes. Liquids take the shape of their container, while gases expand to fill the entire volume available. Solids, in contrast, have a definite shape.

Front

Which of the following is NOT a way that matter changes phase? melting, freezing, evaporation, mixing

Back

mixing

Answer explanation

Mixing is not a phase change; it involves combining substances without altering their states. Melting, freezing, and evaporation are all processes that change matter from one phase to another.

Front

Which of the following is an example of physical change?

• Milk sour
• Wood rots
• Squeeze oranges for juice
• Bleaching your hair

Back

Squeeze oranges for juice

Answer explanation

Squeezing oranges for juice is a physical change because it alters the form of the oranges without changing their chemical composition. In contrast, souring milk, rotting wood, and bleaching hair involve chemical changes.

Front

Temperature is a measure of the average ____________ energy of the particles in the object.

Back

thermal

Answer explanation

Temperature measures the average thermal energy of particles in an object. Thermal energy is related to the kinetic energy of particles, but the term 'thermal' specifically refers to the energy associated with temperature.

Front

Where is an electron located in the atom?

Back

outside the nucleus

Answer explanation

Electrons are located outside the nucleus of an atom, in regions called electron shells or orbitals. This distinguishes them from protons and neutrons, which reside in the nucleus.

Front

Protons have mass in grams of ___________.

Back

1.675x10-24

Answer explanation

Protons have a mass of approximately 1.675x10^-24 grams, which is the correct choice among the options provided. The other values correspond to different particles, such as electrons and neutrons.