Which choice best explains why the scientific model of the atom has changed over time?

The discovery of new evidence resulted in changes to the atomic theory.

Advancements in atomic models proved the atomic theory was accurate.

The atomic theory was modified with the discovery of a new element.

Changes in atomic models show that the atomic theory was based on opinion.

Atomic theory, which describes the atoms that make up matter, has been explored for centuries. Scientists in Ancient Greece first proposed that matter was made of units called atoms. For many years, scientists thought atoms were solid and could not be divided. Then, in the nineteenth century, scientists began to discover the particles that make up atoms. Modern techniques have allowed scientists to split atoms into increasingly smaller particles. Which of the following statements about theories is supported by the history of the atomic theory?

Theories can change in response to new evidence

If new evidence contradicts earlier theories, it is a result of an experimental error

Experiments with modern equipment can not be used to support earlier theories

A theory is discarded when new evidence contradicts a part of the theory.

Which statements correctly describe laws? Check all that apply.

Laws are created based on repeated experimentation.

Laws can be changed or replaced.

Which statements correctly describe theories? Check all that apply

Theories result from several repeated experiments

Theories explain observations and hypotheses

Theories may be revised over time.

Theories cannot predict what may happen in the future

Explaining why theories change For what reasons could a theory be changed or replaced? Check all that apply.

New technology is developed that provides more information about the theory.

New experimental methods are designed to test a theory

New information is discovered that does not support the theory

A new, untested hypothesis is proposed

The validity of scientific theories and laws depends on evidence. Which of the following statements of evidence supports a law rather than a theory?

The amount of matter in a closed system is the same at the start of a reaction as at the end of the reaction.

Electrons orbit the nucleus of an atom within a certain radius.

DNA analysis reveals that a modern species is related to an extinct species.

Seafloor spreading occurs at a rate of three centimeters per year in the mid-Atlantic.

Scientific theories are based on

large amounts of data collected over time.

general assumptions of how systems work.

mathematical principles that can be proven true.

observations from within only one scientific discipline.

Check all the statements that apply to a scientific theory.

Explains how or why an event occurred

States that an event will occur

Check all the statements that apply to a scientific law.

States that an event will occur

Explains how or why an event occurred

Joe tells Gabby his theory about why sea turtles nest on the beach instead of in the ocean. He says, “The turtle eggs would sink to the bottom of the ocean, and the baby turtle would drown. I know this because my uncle is a fisherman, and he told me this information. Gabby tells Joe that his theory is not scientific. Why does Joe’s idea not meet the requirements to be a scientific theory?

Joe’s idea is not supported by scientific evidence.

Joe’s idea is already a scientific law.

Joe’s idea is a good guess that can be tested by experiments.

Joe and his uncle are not scientists.

Lilly was trying to explain to her friend the difference between a theory and a law in science. She used the theory of plate tectonics and the law of superposition as examples. Lilli explained the difference by using non-scientific language. Which statement could Lilly use to correctly describe the difference between a theory and a law in science?

A theory explains a natural event, while a law describes it.

A theory describes a natural event, while a law explains it.

A theory explains a natural event, while a law predicts it.

A theory predicts a natural event, while a law explains it.

Before a scientific theory is accepted and supported, it has

been tested many times by different scientists.

been tested by only one scientist.

been published in scientific journals.

been approved by the International Committee of Scientists.

Theories vs Laws Review

Authored by Jessica Rigdon

Science

7th Grade

NGSS covered

Used 10+ times

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43 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A scientific theory:

Describes a natural phenomenon

Explains a natural phenomeon

A scientific law:

Describes a natural phenomenon

Explains a natural phenomenon

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Scientists create both scientific theories and scientific laws as they make observations and conduct experiments about the natural world. Which of the following statements most accurately compares the difference between scientific theories and scientific laws?

Scientific laws are based on evidence, while scientific theories are not.

Scientific theories involve only biology, while laws involve all types of science.

Scientific theories involve mathematical equations, while scientific laws are based on observations.

Scientific theories are ideas that explain natural events, while scientific laws more reliably predict natural events.

Which of the following ways describe how scientific theories and scientific laws are alike?

Both scientific theories and scientific laws explain why events occur in nature.

Both scientific theories and scientific laws can be modified if new evidence is discovered.

Both scientific theories and scientific laws are accepted by only the minority of scientists in their field.

Scientific theories and scientific laws are not alike in any ways.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Sir Isaac Newton was sitting under an apple tree one day when an apple hit him on the head. He wondered why the apple fell and eventually developed what became the law of gravity. Why is gravity considered a scientific law and not a scientific theory?

The law of gravity describes the attraction between particles in the universe.

The law of gravity explains why the particles attract each other.

Gravity is not a law, it is a theory

The law of gravity explains why the apple hit him on the head.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is supported by lots of evidence?

Theory

Law

Both

Neither

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following tells what happens every time under certain conditions?

Theory

Law

Both

Neither

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Theories vs Laws Review

A scientific theory:

A scientific law:

Scientists create both scientific theories and scientific laws as they make observations and conduct experiments about the natural world. Which of the following statements most accurately compares the difference between scientific theories and scientific laws?

Which of the following ways describe how scientific theories and scientific laws are alike?

Sir Isaac Newton was sitting under an apple tree one day when an apple hit him on the head. He wondered why the apple fell and eventually developed what became the law of gravity. Why is gravity considered a scientific law and not a scientific theory?

Which of the following is supported by lots of evidence?

Which of the following tells what happens every time under certain conditions?

Which of the following can be revised with new evidence?

Which choice best explains why the scientific model of the atom has changed over time?

Scientific theories do not change once they have been written down.

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