Question

A scientist is trying to identify an unknown substance. The answer to which of the following questions would give the scientist information about a chemical property of the substance?

Is it possible to change the shape of the substance?

Does the substance corrode when left in water?

What color is the substance?

At what temperature does the substance melt?

Answer 1

help @crabby_patty

Answer 2

I'm pretty sure that it is whither or not it corrodes since all of the other ones are physical properties.

Answer 3

can u help with more

Answer 4

Which element would you expect to have a higher electronegativity than nitrogen (N)?

fluorine (F)

cesium (Cs)

boron (B)

phosphorous (P)

Answer 5

What do all elements in a column in the periodic table have in common?

Their atoms have the same number of valence electrons.

Their atoms have the same atomic mass.

Their atoms have the same number of protons and electrons.

Their atoms have the same number of neutrons.


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Question 6 (Multiple Choice Worth 1 points)

[04.06]


Neon (Ne) is very unreactive. Which of these elements most likely shares this property?

sodium (Na)

xenon (Xe)

boron (B)

phosphorus (P)


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Question 7 (Multiple Choice Worth 1 points)

[04.05]


An atom has an atomic number of 12 and a mass number of 25. How many neutrons does the atom have?

12

13

25

37


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Question 8 (Multiple Choice Worth 1 points)

[04.05]


Which statement about subatomic particles is true?

Protons are the only subatomic particles to have charge.

Electrons are the subatomic particles with the smallest mass.

Neutrons orbit the nucleus of the atom.

Subatomic particles all have the same mass.


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Question 9 (Multiple Choice Worth 1 points)

[04.05]


What best describes the location of an atom's electrons?

In the area that surrounds the nucleus

In the nucleus

In both the nucleus and the electron cloud

None of the above


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Question 10 (Multiple Choice Worth 1 points)

[04.01]


The helium that fills a balloon is an example of which state of matter?

solid

liquid

gas

plasma


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Question 11 (Multiple Choice Worth 1 points)

[04.01]


Which state of matter contains particles that move slightly in a fixed position?

solid

liquid

gas

plasma


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Question 12 (Multiple Choice Worth 1 points)

[04.01]


A balloon is filled with helium gas. What will happen as the average kinetic energy of the helium particles increases?

The balloon will decrease in total volume.

The temperature of the balloon will decrease.

The gas atoms will strike the sides of the balloon more often.

The gas inside the balloon will change into a liquid.


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Question 13 (Multiple Choice Worth 1 points)

[04.01]


As a race car races around the track, friction between the tire and the road heats the air in the tires and the pressure inside the tires increases. What is the best explanation for this?

Particles in the air hit the inside of the tire walls less frequently.

Air particles speed up and collide with the tire walls more often.

Air particles get larger and make the gas take up more space.

The heat causes the rubber in the tires to create new air particles.


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Question 14 (Multiple Choice Worth 1 points)

[04.01]


How does the movement of particles of matter change when matter goes from solid to liquid?

increases

decreases

increases then decreases

does not change


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Question 15 (Multiple Choice Worth 1 points)

[04.01]


Which best describes the transition from gas to liquid?

Energy must be removed because particles in liquid move more slowly.

Energy must be added because particles in liquid move more quickly.

Energy is neither added nor removed in this phase transition.

Energy is either removed or added, depending on the type of particles.


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Question 16 (Multiple Choice Worth 1 points)

[04.01]


Temperature is most closely related to which property of a liquid?

the volume of the liquid

the number of atoms in each molecule

the speed of movement of the molecules

the total number of molecules


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Question 17 (Multiple Choice Worth 1 points)

[04.01]


What happens to a sheet of copper as the average kinetic energy of the copper molecules decreases?

It melts.

It expands.

It gets cooler.

It gains energy.


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Question 18 (Multiple Choice Worth 1 points)

[04.01]


Which statement is true about the speed of heat transfer by conduction?

It is fastest in gases because their particles move at a faster rate.

It is fastest in liquids because their particles are not strongly attracted to each other.

It is fastest in solids because their particles are close together.

It is fastest in plasmas because their particles vibrate and create energy.


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Question 19 (Multiple Choice Worth 1 points)

[04.01]


Which state of matter is least likely to transfer heat by convection?

solid

liquid

gas

plasma


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Question 20 (Multiple Choice Worth 1 points)

[04.04H]


Whose model of the atom did J.J. Thomson prove to be incorrect with his Cathode–Ray tube experiments?

Neils Bohr

John Dalton

Erwin Schrodinger

James Chadwick


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Question 21 (Multiple Choice Worth 1 points)

[04.04H]


Which of these ideas was part of the earliest model of the atom?

Atoms can produce streams of charged particles.

Electrons move too fast to describe where they are located.

Neutrons are located in the same place as protons.

Atoms are hard, tiny particles like billiard balls.


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Question 22 (Multiple Choice Worth 1 points)

[04.04H]


J.J Thompson proposed that atoms were made up of positively charged particles with electrons scattered into them. How did he reach this conclusion?

He conducted an experiment using gold foil that showed positively charged particles were only deflected by a small percentage of the atoms.

He conducted an experiment using a cathode ray and charged metal plates.

He conducted an experiment that showed a positive charge located in the center of the atom.

He conducted experiments that bombarded substances with alpha particles.


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Question 23 (Multiple Choice Worth 1 points)

[04.02]


Which of these statements best describes the relationship between elements, compounds, and pure substances?

Pure substances can be divided into two groups: elements and compounds.

Compounds can be divided into two groups: pure substances and elements.

Elements and pure substances are two of many different types of compounds.

Pure substances and compounds are two of many different types of elements.


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Question 24 (Multiple Choice Worth 1 points)

[04.02]


Which best describes a way that the periodic table is arranged?

The metalloids are placed in two separated rows at the bottom of the table.

The nonmetals are grouped together, which the exception of hydrogen.

The nonmetals are all in the same column.

The metals are placed in order of decreasing atomic number.


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How do the elements change as you go to the right along a row of the periodic table?

The number of valence electrons decreases.

The number of protons increases.

The average atomic mass decreases.

The atomic radius increases.


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Which is a way that the model of the atom became stronger through new experiments?

New technology allowed scientists to show that the atom is indivisible.

It took new data to show that positive charge is not spread throughout an atom.

By deflecting alpha particles, Rutherford first observed the neutron.

The neutron could not be detected until Cathode–Ray Tubes were invented.


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The atomic theory has been revised over time. J.J. Thompson described the atom as having a mix of positive and negative charges randomly scattered throughout a sphere of space. Rutherford’s experiments proved this model incorrect and developed the model with a tiny positively charged nucleus. Today, the model is more complex explaining a cloud of electrons around a nucleus of protons and neutrons. Why has the atomic theory changed during the last several hundred years?

The splitting of the first atom created the need for a new model.

Modern scientific methods are more reliable in developing theories.

The atom has changed over time and the model reflects those changes.

As new discoveries are made, existing theories are revised or replaced.


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If different groups of scientist have access to the same data, how can they draw different conclusions?

Scientists manipulate data to fit their hypotheses, which results in different conclusions.

Scientific predictions must list every possibility, and so scientists are not technically incorrect.

Scientists have different specialties and will interpret data differently, depending on their specialties.

Scientific predictions are not usually testable, so this leads to different conclusions.


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How have the competing explanations' experiments on atoms affected the development of the atomic model?

The atomic model better represents the actual functioning of an atom.

The atomic model has become much simpler than it used to be.

The atomic model now involves fewer subatomic particles.

The atomic model has become less strong over time.

Answer 6

Flourine, except for the nobel gasses, electronegativity increases to the right and up