Science exam

When a Cl atom gains an electron, it gets a charge of

-1

The electron dot notation for the element indium (#49) is

. in . (The dot on the eye is a electron)

An atom has 6 elections and 6 neutrons, it is electrically neutral. What is the mass nUmber of this atom

12

How many atoms are in C3H603

12

If an atom has 12 protons how many electrons should be present

12

An isotope has a mass has a mass number of 74 and contains 42 nurtons. What is the group number of that element

14

The Maximum number of electrons in the three energy level is

18

The maximum number of electrons in the first energy level is

2

Matter is composed of how many atomic particles usually

3

Which of these atoms is nit an isotope of the other three

3He

Which of the following is true of C14

6 protons 8 neutrons 6 electrons

The maximum number of electrons in the second energy level is

8

Water is a

A compound

What is the smallest particle listen below

A quark

Electron movement is best describes as

A vibration

The attractive force between similar molecules is called

Adhesion

What is the difference between an element and a chemical compound

An element consists of only one type of atom

The smallest unit of an element

Atom

Until the 19th century scientists though that the smallest structure of which matter was composed was

Atom

The number if protons plus the number of nuetrons in an atom equals

Atomic mass

The father an electron is from the nucleus the more likely it will

Be lost

Which is not an ionic compound

C2h5OH

Which of the following IS NOT a covalent compund

CaO

Choose the chemical forumula and compound that has one calcium Aron and 2 chlorine atoms and predict the bond between them

Cacl2 ionic

Without him every, molecular motion would

Cease

Iron and yellow sulfur are heated and form a non-magnetic substance

Chemical change

The sharing gaining and losing electrons cause a

Chemical change

The science that looks at how stuff is made and how to make new stuff

Chemistry

The force of attraction together that hold water molecules together

Cohesion

A chemicals reaction must take place to form

Compound

Formed when an atom gains or loses or shares an electron

Compound

H20

Compound

Matter that can not be broken down easily but can be written as a formula

Compound

Water is an example of a

Compund

A bond between nitrogen (#7) and oxygen (#8) would be

Covalent

In what type of compound are the elements shared

Covalent

Hydrogen fluoride has a ____ bond and its chemical formula is _____

Covalent , HF

How many valence electrons are in an atom of radon

Eight

What is found in a cloud around the outside of the atom

Electron

The chemical properties of matter comes from mostly its

Electrons

A substance that can't be broken into simpler substances by ordinary means

Element

Which of the following statements is NOT true of elements on the periodic table

Elements to the left of the zig zag line are metalloids

For work to be done you must have

Energy

The thing that is needed to do work

Energy

Chemcial shorthand formed by a combinatuin if symbols, formulas or both

Equation

The burning of a match

Exothermic reaction

Non metals tend to _________ electrons to become _____

Gain, negative

What does the symbol ^ mean in an equation

Gas

If element 120 was found where would it be placed on the periodic table

Group 2, period 8

With an energy increase, molecular motion would

Increase

An element with an electrical change

Ion

A compound where electrons are transferred

Ionic

What matter is found naturally I'm all three states on earth

Iron

Which has the greatest number of protons in its nucleus

Lead

At room temperature Mercury is

Liquid

The actual counted number of atoms in a lump of carbon

Mass

An element whose atoms lose electrons, is usually a solid at room temperature, conducts heat and electricity well, has a density and can be easily hammered or shakes

Metal

What grouo of elememts loose electrons in a chemical reaction

Metals

Iced tea, sugar water & air

Mixture

O2, p4 are

Mixture

What is the sum of all the mass of all of the atoms in a compound

Molecular mass

How many valence electrons do non-metals have

More than 4

Electrons have what charge

Negative

A neutron has what charge

Neutral

Which of the following are electrically neutral

Neutron

Of the following which is not an inert gas

Nitrogen

The octet rule explains the stability of most covalently bonded molecules in terms of

Noble gas configurations

Covalent bond is formed between atoms of

Non-metals

The symbol ➡️ in an equation means

None of the above (yields)

Most of the mass of an atom is found in the

Nucleus

What is found in the center of all atoms

Nucleus

The atomic number is equal to the

Number of protons

Solid matter is mostly empty space, the reason solids don't fall through one another is because

Of electrical force

In an electrically neutral atom, the. Umber of protons I'm the nucleus is balanced by an equal number of

Orbital electrons

Contains carbon compounds

Organic chemistry

What electron level is the most important in a chemical reaction

Outermost

What is the group and period number for the element with an electron configuration of 2-8-6

Period 3, group 16

What is the relationship between the elements number of shells and the element placement on the periodic table

Periodic placement

Dry ice (solid carbon dioxide -- CO2) becomes a gas by sublimation at room temperature

Physical change

Iron and sulfur mix and form a partially magnetic black and yellow mixture

Physical change

The freezing or melting of matter

Physical change

Protons have what type of charge

Positive

One element is distinguished from another by the number of

Protons

Which two particles are about equal in mass

Protons and neutron

In covalent bonds, electrons are

Shared

How may valence electrons are in an atom of sulfur (#16)

Six

Matter that is rigid and has shape

Solid

Atoms tend to Complete their outer shell by all of the following except

Splitting

Fe, Cl, Au, O, C, and N are

Symbols

What makes an element distinct

The number of protons

The purpose of coefficients in chemical equations is to make

The number of times each element appears as a react and as a product the same

How does the mass of a protons compare to the mass of an electron

The proton is much more massive

Compared to the energy it takes to seperate oxygen and hydrogen from water, the amount of energy given off when they recombine is

The same

Elements in a family or group in the periodic table often share similar properties be chase

Their atoms have the same number of electrons in their outer level

Which of the following statements is true

There are only about 100 different kinds of atoms that combine to form all substances

N has 5 valence electrons and it is a diatomic molecule. How many covalent bonds are there in a N2 molecule

Triple

How many different elements are in a water molecule

Two

How many electrons will a calcium atom (ca) element 20 lose in order to get w noble gas configuration

Two

Which of these atoms has the most mass

Uranium

The number if electrons an element will exchange or share during a reaction

Valence number