What characteristic is common among elements classified as metalloids?

Properties of both metals and nonmetals

High melting points and good electrical conductivity

Low melting points and poor electrical conductivity

They are all gases at room temperature

What is the primary difference between mass and weight?

Mass is the amount of matter in an object, while weight is the force due to gravity on an object.

Mass changes depending on the location, while weight remains constant.

Weight is the amount of space an object occupies, while mass is how heavy it is.

Mass can be measured in liters, while weight is measured in grams.

What does the term 'viscosity' refer to?

How easily a liquid is able to flow.

The ability of a substance to dissolve in another substance.

The ability of a substance to conduct electricity.

The ability of a substance to decrease in volume under pressure.

What does 'magnetism' refer to in the context of physical properties?

The ability of a substance to respond to a magnetic field

The ability to dissolve in solvents

The ability to conduct electricity

The ability to react chemically with acids or bases

What happens to a substance during a physical change?

It changes its appearance but not its identity or chemical composition.

It changes its identity and chemical composition.

It reacts to form one or more different substances.

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

Zinc reacting with hydrochloric acid to form zinc chloride and hydrogen gas

Cutting aluminum into thin sheets

What is a common sign that a chemical reaction has occurred?

A change in color or temperature

The substance being shredded or broken

The substance being filtered or pounded

The substance freezing into a solid

Which of the following is NOT a chemical change?

Mixing red and blue paint to make purple

Silver reacting with sulfur to form silver sulfide

In a chemical equation, what do the coefficients represent?

The number of molecules of each substance involved

The physical state of reactants

The temperature at which the reaction occurs

What is a nonrenewable resource?

A resource that is used faster than it can be replaced.

A resource that regenerates quickly and can be used repeatedly.

A resource that is mainly used for generating electricity.

A resource that has no environmental impact.

What is the main environmental drawback of using nuclear energy?

It produces radioactive waste that is harmful to organisms and their environment.

It produces a large amount of air pollution.

It is very expensive to harness.

It requires a large amount of water to produce energy.

Why is solar energy considered less reliable compared to fossil fuels?

It depends on weather conditions and daytime availability.

It is more expensive to convert into electricity.

It produces harmful byproducts like smog.

What is a major benefit of using wind energy?

It does not produce waste or pollution.

It is the cheapest form of energy available.

It can be used in any geographical location.

What is biomass energy primarily derived from?

Decomposition of dead organisms

Why are fossil fuels considered nonrenewable?

They take millions of years to form

They are primarily derived from living organisms

What is a major disadvantage of wind energy?

It is inconsistent and weather dependent

What is the primary function of cells?

To perform life functions necessary for survival

To provide structure to the body

What role do organelles play within a cell?

They function like organs of a cell, each performing specific functions

They provide energy for cell division

They are only involved in the digestion of food particles

what is unique about plant cells compared to animal cells?

Plant cells have a cell wall and a large central vacuole

Plant cells do not have mitochondria

Plant cells do not perform cellular respiration

How do amoebas obtain their food?

Surrounds, engulfs, and ingests its food with pseudopodia

Draws food into a mouth-like opening lined with cilia

Uses green chloroplasts to trap sunlight

What type of cell structure do viruses have?

Simple structure containing DNA or RNA

Single celled structure with organelles and nuclei

Multicellular structure with a cell wall

What characteristic movement is associated with Euglena?

Whip-like structures called flagella

Numerous short, hair-like cilia

"False feet" called pseudopodia

A disease that affects an unusually large number of individuals within a population, community, or region.

A disease that affects a small group of people in a localized area.

A worldwide spread of a new disease.

A disease that is always contagious.

Which of the following is NOT a characteristic of a pandemic?

Affects only a small number of people.

Spreads over an entire continent or even worldwide.

Can be a secondary infection that an epidemic disease causes.

Not necessarily contagious for all diseases.

How do disease vectors spread infectious diseases?

By carrying pathogens that they transfer to humans or other hosts.

Through contaminated water only.

By causing environmental changes that foster disease spread.

Through airborne particles only.

What role do microorganisms like bacteria and yeasts play in the food industry?

They help in processes like fermentation and preservation of food.

They are only involved in the spoilage of food.

They can cause diseases and are not used in food production.

They are harmful and are removed from all food products.

Which method is NOT a way to prevent the spread of microbial diseases according ?

Using strong antibiotics regularly.

Washing hands and sterilizing equipment.

Vaccinations using weak or inactive strains of viruses.

Better sanitation and safer food processing.

What is the primary role of bacteria in the environment according?

To break down unwanted organic materials

To compete with humans for food

What is the main goal of the Human Genome Project as described?

To sequence all the base pairs that compose human DNA

To map all the genes on human chromosomes

How do researchers alter the DNA of bacteria for drug manufacturing?

By studying and altering the DNA sequence

By changing their living environment

What is a major challenge mentioned in the text regarding cloning?

Clones often do not develop into adult organisms

It is widely accepted ethically

It does not require DNA manipulation

What type of images does an electron microscope help to visualize?

The individual structures of a cell

External features of the human body

Large scale environmental areas

What is a common risk associated with the use of medications?

Having side effects and being regulated by the government

Causing Reye's Syndrome in older people

Being ineffective against diseases

NC 8th grade science Review

Authored by Joe Isaac

Science

8th Grade

81 Questions

NGSS covered

Used 17+ times

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MULTIPLE CHOICE QUESTION

Group 1: Alkali metals

Group 2: Alkaline earth metals

Group 17: Halogens

Group 18: Noble gases

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NC 8th grade science Review

What is the basic building block of all matter?

Which of the following is an example of a pure substance?

What type of mixture is salad classified as?

Which statement best describes a compound?

What is the primary purpose of the Periodic Table?

what defines a "period" in the periodic table?

Which group in the periodic table consists of elements that are all metals except hydrogen?

What characteristic is common among elements classified as metalloids?

Which of the following elements is a metalloid?

What is the primary difference between mass and weight?

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