Which of the following is an example of a chemical change?

• Melting ice

• Burning wood

• Boiling water

• Breaking glass

Answer explanation

Burning wood is a chemical change because it transforms the wood into ash and gases through combustion, altering its chemical structure. In contrast, melting ice, boiling water, and breaking glass are physical changes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are the three main phases of matter?

• Solid, liquid, gas

• Water, air, fire

• Earth, wind, fire

• Metal, wood, plastic

Answer explanation

The three main phases of matter are solid, liquid, and gas. These states describe the distinct forms that different phases of matter take on, with solids having a fixed shape, liquids taking the shape of their container, and gases expanding to fill available space.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which term describes the attraction between molecules of the same substance?

• Adhesion

• Cohesion

• Conduction

• Radiation

Answer explanation

Cohesion refers to the attraction between molecules of the same substance, such as water molecules sticking together. This is different from adhesion, which is the attraction between different substances.

What does the kinetic molecular theory explain?

• The color of objects

• The movement of particles in matter

• The shape of planets

• The flow of electricity

Answer explanation

The kinetic molecular theory explains how particles move in matter, detailing their behavior in solids, liquids, and gases. This theory is fundamental to understanding temperature, pressure, and the states of matter.

Tags

NGSS.MS-PS1-4

Which process transfers heat through direct contact?

• Convection

• Radiation

• Conduction

• Evaporation

Answer explanation

Conduction is the process that transfers heat through direct contact between materials. When two objects at different temperatures touch, heat moves from the hotter object to the cooler one via conduction.

In a predator-prey relationship, which organism is typically hunted?

• Predator

• Prey

• Producer

• Decomposer

Answer explanation

In a predator-prey relationship, the prey is the organism that is hunted by the predator. The predator is the hunter, while producers and decomposers play different roles in the ecosystem.

What is a Punnett square used for?

• Measuring temperature

• Predicting genetic outcomes

• Calculating speed

• Drawing constellations

Answer explanation

A Punnett square is a tool used in genetics to predict the possible genetic outcomes of offspring based on the alleles of the parents. Therefore, the correct answer is 'Predicting genetic outcomes'.

Tags

NGSS.MS-LS3-2

Which celestial body is at the center of our solar system?

• Earth

• Moon

• Sun

• Mars

Answer explanation

The Sun is the central celestial body of our solar system, providing light and heat. Earth, the Moon, and Mars are all planets or moons that orbit around the Sun.

Tags

NGSS.MS-ESS1-1

Which of the following is a renewable resource?

• Coal

• Oil

• Solar energy

• Natural gas

Answer explanation

Solar energy is a renewable resource because it is derived from the sun, which is inexhaustible. In contrast, coal, oil, and natural gas are fossil fuels that deplete over time.

What is a watershed?

• A type of rock

• An area of land that drains water into a river or lake

• A weather pattern

• A type of cloud

Answer explanation

A watershed is defined as an area of land that drains water into a river or lake. This means it collects precipitation and directs it to a common outlet, making it crucial for understanding water flow and ecosystem health.

Tags

NGSS.MS-ESS2-4