Honors 7th grade Spring Review

Why do these puppies look different despite the fact they have the same parents?

• they are clones

• some of the puppies inherited their traits from only one parent

• all the puppies are developed from the same egg

• all of the puppies have a unique combination of genetic material due to sexual reproduction

When trying to identify an unknown element, a scientist determines what other elements reacts with chemically. Which property of the unknown element determines the other element it reacts with?

• The total number of neutrons in the unknown element

• The total number of particles in the nucleus of the unknown element

• The number of protons in the nucleus of the unknown element

• The number of valence electrons in the unknown element

How do electrons of an element determine that element's reactivity?

• If the valence shell has missing electrons it is very reactive to attract or lose more electrons.

• If the valence shell has a full ring of electrons it is very reactive because it needs more.

• If the valence shell has a full shell of electrons it is very reactive because it is already full.

• If the valence shell has missing electrons it is not reactive because it is missing electrons.

Which of the following characteristics is similar for fluorine and iodine?

• Number of protons

• Number of neutrons

• Number of orbitals

• Number of valence electrons

An atom is made up of three different subatomic particles, protons and neutrons are located within the nucleus, and the electrons are located on rings outside of the nucleus. What statement best describes the charges of the element if there are two protons, two neutrons, and two electrons?

• Both neutrons and protons are positively charged

• Both neutrons and protons are negatively charged

• Either the neutron or the proton have a positive charge

• Electrons have a negative charge

Which action and reaction statement best describes the dog on the fence?

• Action: force of the dog on the fence

  Reaction: the force of the wood planks on the fence

• Action: the force of the wood planks on the fence post

  Reaction: the force of the fence post on the dog

• Action: the force of the fence post on the dog

  Reaction: the force of the dog on the wood planks

• Action: the force of the dog on the fence post

  Reaction: the force of the fence post on the dog

Farmers plant crops that help to reduce the negative impact of water quality by nearby water sources through ___.

• produce with less oxygen

• produce with less carbon dioxide

• crops that need less fertilizer

• crops that need less solar energy

What long-term changes would there be on native Texan grasslands if an invasive species of grasses were introduced?

• population of native grassess will increase

• population of native grassess will decrease

• invasive species will develop traits like those of the native grassess

• invasive species will develop traits of other invasive grass species

A train that travels 100 kilometers in 4 hours is traveling at what average speed?

• 50 km/h
• 100 km/h
• 2 km/h
• 25 km/h

If a bicyclist travels 30 km in 2 hours, her average speed is

• 30 km/h
• 60 km/h
• 15 km/h
• 2 km/h