Scitest

Mr. Shraft has an iron bumper on his car. Over time, rain and oxygen caused some of the iron bumper to turn into a new substance of rust. Which of the following best explains the reaction which created the rust?

• A) It is a mixture like mixing water and salt.

• B) It is a physical change since the oxygen can be easily separated from the iron of the bumper through evaporation.

• C) It is a physical reaction since a new substance was formed.

• D) It is a chemical reaction since a new substance was made.

Brock Heart's action was pushing his feet on the wall of a pool. The reaction was an equal and opposite force that was placed upon him from the wall pushing him forward. This is an example of ________.

• F) Newton's First Law

• G) Newton's Second Law

• H) Newton's Third Law

• J) Boyle's Law

A boy on skateboard is on the top edge of a hill on a street. He then allows the hill to pull him to the bottom. He rides all the way down without adding any additional movement of his own. Which of the following is true?

• A) His potential energy was highest on the top of the hill.

• B) His kinetic energy was highest on the top of the hill.

• C) His kinetic energy was the lowest at the bottom of the hill.

• D) His potential energy was the highest at the bottom of the hill.

What area can a sound wave not travel through?

• F) Water in the oceans

• G) Outer space between planets

• H) The air between two people

• J) A wooden door

Which best explains the reason why an electronic scale is not a living thing?

• The scale responds when placing objects on it.

• The scale does not have cells with organelles.

• The scale uses energy.

• The scale is organized into different parts.

Bees pollinate flowers from the same species of plants. The bees obtain food, and then the plants can reproduce. Which of the following best describes this situation?

• Competition

• Parasitism

• Predation

• Mutualism

Which of the following would show the least amount of genetic variation in relation to the reproduction of plants?

• Using flowers in reproduction

• Using seeds in reproduction

• Using regeneration in reproduction

• Using fruit in reproduction

Which is an example of camouflage for beetles?

• Brown beetles on brown plants

• Exoskeleton for protection

• Wings to escape predators

• Six legs for fast movements

Which best describes the reason why the planets in our solar system orbit the Sun?

• Only the planets have pull of gravity on the Sun.

• The Sun's pull of gravity on the planets.

• The Sun's gravity pushing on all the planets.

• The gravity of all the planets pushing away from the Sun.

Which of the following would best describe a physical change?

• Baking a cake

• Water evaporating

• Food decomposing

• Burning gasoline