Chem midterm that's definitely on the test

Flammable materials, like alcohol, should never be dispensed or used near

an open flame

Approved eye protection devices(such as goggles) are worn in the laboratory

any time chemicals, heat or glassware are used

Stephen accidentally breaks a window while tossing a baseball. The window shatters into what seems like a million pieces. What happens to the matter in the glass?

The matter looks different, but the amount stays the same.

Which statement is true about matter?

all matter has volume, all matter has mass

The mass of an object is the

amount of matter it contains.

Which of the following abilities is not a physical property of matter?

ability to react chemically with other substances

Which of the following examples depict(s) a physical property?

All of the above

Which of the following is not a physical property of matter?

 flammability.

Existence of a substance as a solid or a gas largely depends on:

All of the above

The water cycle is a complex system. In it, water changes states. Sometimes it is a liquid. Sometimes it is a solid. Other times it can become a gas. What change occurs when water is boiled?

Liquid becomes a gas.

Select all possible answers:
Which of the following best describe gas particles?

moving randomly , collide into each other , high kinetic energy

The physical change in melting an ice is reversible.

True

The physical change from liquid to solid is known as what?

freezing

When zinc is immersed in hydrocholoric acid, it produces hydrogen gas. This is a physical change.

False

We can observe a chemical property during a chemical reaction.

True

Which of the following statements best describes why burning a match would be considered a chemical reaction?

Burning a match forms new substances.

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

corrosion

Formation of a precipitate in a chemical reaction is considered a:

Chemical change

If you mix two clear, colorless liquids together, which of the following observations would indicate a chemical reaction has occurred?

A solid appears in the tube and settles to the bottom.

A small piece of silvery metal is added to a large beaker of water and immediately erupts into flame. This is evidence that a chemical reaction is occurring.

True

If a powdered solid were mixed with a liquid which of the following observations would most clearly indicate a chemical reaction was occurring?

The mixture starts fizzing and releasing gas.

Element

Group

Period

What happens to water vapor in rising air as it starts to cool?

It condenses

The weather in a location is related to

All of the above

Weather occurs because of differences in heating throughout the atmosphere

True

Atoms are _____ in charge.

Neutral

All atoms of the same element have the same number of protons.

True

What are subatomic particles with a positive charge called?
 

protons

Protons have less mass than electrons.

False

An atom can have 2.5 protons, as long as it also has 2.5 electrons.

False

A neutral atom has 37 electrons. How many protons does the atom have?

exactly 37 protons

Which of the following is/are true for protons?

 All of the above

The mass of a neutron is close to the mass of

 a proton.

Which of the following subatomic particles is neutral?

Neutron

The periodic table illustrates a recurring pattern in the properties of the elements when they are arranged in order of increasing atomic number.

True

Horizontal rows of the periodic table are called _____.

periods

Which statement correctly describes the relationship between chlorine and argon?

Argon has a larger atomic number and a larger atomic mass

Vertical columns of the periodic table are called _____.

groups , families , family , group

Atomic radii increase in size with an increase in the atomic number across a period.

False

Which group/family contains elements with the smallest radius within the same period?

Halogens

An ion always has the same number of protons and electrons.

False

If an atom gains or loses electrons, it becomes a(n) _____.

ion

What happens to an atom when it loses electrons?

It becomes a positively charged ion.

Which electron is the first to be removed from any atom?

a valence electron

Which of the following explains why ionization energy decreases down a group?

The atomic radius increases, so electrons are farther from the nucleus

Which member of the alkaline earth metals has the smallest electronegativity?

Ra

Which member of the halogen elements has the highest electronegativity?

F