Answers GA-GSE Physical Science AMetalloids

Metalloids — Unit test Answers

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Which have different numbers of electrons?

different ions of an element

different isotopes of an element

the nucleus of an element

each of the atoms of an element

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A company that manufactures cookware has conducted numerous trials to see which metal needs the least amount of energy (measured in Joules, J) to be raised to high temperatures, and records the averages in a table. Which claim will this company most likely make?

Aluminum pans are the most energy-efficient cookware.

Copper pans are the most energy-efficient cookware, but they cost the most.

Iron pans require less energy to heat up than copper frying pans, but they cost less.

Copper pans require the most energy to heat up.

What information most likely lead to some states banning the use of cell phones while driving?

studies showing that people frequently use cell phones

studies showing that accidents have increased

studies showing that people prefer to talk while driving to save time

studies showing that accidents have occurred before cell phone use

Which is a process that involves collecting information and ideas that are supported by belief or opinion?

science

systematics

pseudoscience

hypothesis

What best describes the states of nonmetals when they are at room temperature?

Most nonmetals are gaseous, but some are liquid or solid.

All nonmetals are gaseous unless they bond with a metal.

Most nonmetals are solids, but some are gaseous or liquid.

All nonmetals are solid unless they bond with a metal.

In what way did scientists Jonas Salk and Albert Sabin influence society?

They generated plastics for increased manufacturing.

They discovered a vaccine to reduce illnesses.

They discovered the uses of X-rays to improve patient care.

They generated hydroelectric power for cleaner energy.

Which sequence furthers scientific knowledge?

Hypotheses generate a scientific question, leading to observations, which can be tested through an experiment.

Observations generate a scientific question, leading to a hypothesis, which can be tested through an experiment.

Hypotheses generate a scientific experiment, leading to observations, which can be tested through a question.

Observations generate a scientific experiment, leading to a hypothesis, which can be tested through a question.

An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?

Davahl is interested in tortoises because they can live for over a hundred years and have unique metabolisms. She wants to perform an experiment to see if they can live even longer with a specific nutrient supplement. Davahl is given a five-year research grant to perform her experiment.

time

ethics

money

technology

Vincent graduated from college with a degree in horticulture and now owns a local plant nursery. He maintains a blog titled, "How to Live a Happy Life,” and writes that people can lead happier lives by varying the routes they usually take home from work.

This claim is scientific because it is based on Vincent’s personal experience.

This claim is scientific because other people have taken his advice and are now happier.

This claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.

This claim may not be accurate because most people follow the same route home.

How does a scientist use creativity?

by requiring evidence and thinking logically

by taking a closer look at the natural world

by asking questions about the natural world

by using prior knowledge to solve problems

Students are completing a table about a particular subatomic particle that helps make up an atom.What best explains how they should complete the table?

with “Inside the nucleus,” because the particle is a proton

with “Inside the nucleus,” because the particle is a neutron

with “Outside the nucleus,” because the particle is a proton

with “Outside the nucleus,” because the particle is an electron

Rutherford used positively charged particles to investigate the structure of the atom. The results surprised him, and he developed the atomic model shown below.

A few positive particles bounced back because they bounced off of the net formed by the ovals.

A few positive particles bounced back because they were pushed away from the positive center.

Most positive particles passed through because of the empty space between the outer edge and the center.

Most positive particles passed through because they were attracted by the small particles moving around the center.

Read the passage about the fluoridation of drinking water.Since the early 1960s, fluoride has been added to many sources of drinking water to prevent cavities in teeth. This is called fluoridation. There are some who say that this is unnecessary and increases the risk of cancer.In 1993, the Subcommittee on Health Effects of Ingested Fluoride of the National Research Council, part of the National Academy of Sciences, conducted an extensive study about the link between fluoridated drinking water and increased cancer risk. The study included data from more than 50 human disease studies and six animal studies. The Subcommittee concluded that none of the data showed a link between fluoridated drinking water and cancer. A 1999 report by the CDC supported these findings. The CDC report concluded that studies so far have produced "no credible evidence” of a link between fluoridated drinking water and an increased risk for cancer.

There is no link between fluoride exposure and increased cancer risk in humans.

There is a possible link between fluoride exposure and increased cancer risk in humans.

There is a definite link between fluoride exposure and increased cancer risk in humans and animals.

There is a possible link between fluoride exposure and increased cancer risk in animals.

Which important change in electronic devices, such as televisions and computers, is a result of the use of metalloids as semiconductors?

Electronic devices have become smaller.

Electronic devices are now more brittle.

Electronic devices now use more energy.

Electronic devices have become more expensive.

The model below shows an atom of an element.

What is an atomic nucleus?

the outer part of an atom in which electrons move

the outer part of an atom in which neutrons move

the central part of an atom, composed of protons and neutrons

the central part of an atom, composed of protons and electrons

must

electrical charges.

numbers of neutrons.

atomic numbers.

energy levels.

Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.

A few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil.

Experiments with water vapor showed that elements combine in specific proportions.

Equations were used to identify regions around the nucleus where electrons would likely be.

Cathode rays were bent in the same way whenever a magnet was brought near them.

Which statement describes the relationship between science and society?

Science is rarely influenced by the needs of society.

Science and society are independent.

Science and society have different goals.

Scientists find new ways to address societal concerns.

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Metalloids — Unit test Answers

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