Science Exam Chem

Question 1

What unit refers to 6.022x10 *23 particles of a substance

Answer 1

Mole

Question 2

What term refers to the sum of the atomic mass of all atom in a molecule

Answer 2

Molecular mass

Question 3

What are the electrons located in the outer most shell of any atom called

Answer 3

Valence electron

Question 4

Type of inter-molecule force is present between all polar molecules but not between non polar molecules

Answer 4

Dipole-dipole force

Question 5

By physical properties elements are divided into three group metals,semi metals, and

Answer 5

Non metals

Question 6

The chemical name for covalent compound that contains one uranium atom and six Florine atom

Answer 6

Uranium hexa floride

Question 7

A homogeneous mixture that contains and consists of a solute dissolved in a solvent called

Answer 7

Solution

Question 8

The process of mixing molecules of one substance by random molecular motion is

Answer 8

Diffusion

Question 9

The organized study of the composition and interaction of matter

Answer 9

Chemistry

Question 10

The mixture containing tiny suspended dumps of particles called

Answer 10

Colloids

Question 11

Term that refers to the time required for one half radioactive sample to decay into a new substance

Answer 11

New life

Question 12

In a solution the substance that is dissolved is the

Answer 12

False, solute

Question 13

The process of combining 2 nuclei to form a heavier nucleus is fission

Answer 13

False, fusion

Question 14

If a molecule or a mixture are not completely mixed together, the substance is a homogenous mixture

Answer 14

False, heterogeneous

Question 15

Magnesium is a alkaline earth metal and chlorine is a hallogine the substance is magnesium and chlorine most likely have an ionic bonding

Answer 15

True, ionic

Question 16

Protons and neutrons are found in the nucleus

Answer 16

True, nucleus

Question 17

The law stating the elements show regular and repeating properties when a range by increasing atomic numbers is the periodic law

Answer 17

True, periodic law

Question 18

What intermolecular force occurs between all molecules

Answer 18

London force

Question 19

What are atoms of the same element that have different mass numbers

Answer 19

Isotopes

Question 20

What type of bond occurs when 2 atoms share 2 pairs of electrons in a covalent bond

Answer 20

Double bond

Question 21

Mass number of magnesium (mg)

Answer 21

26 over 12 = 26 (top)

Question 22

What property describes how strongly atoms of an element pull on electrons in a chemical bond

Answer 22

Electronegativity

Question 23

What value relates to number of moles of salute per mass of solvent

Answer 23

Molality

Question 24

What substance is composed of 2 or more elements bonded together

Answer 24

Compound

Question 25

When atoms with different electronegativity bond what is the type of bond for med between the atom

Answer 25

Polar

Question 26

What is the general term for a row of elements in the periodic table is a

Answer 26

Period

Question 27

What is the general term for a physical combination of pure substances

Answer 27

Mixture

Question 28

Chemical name for the compound SCL4

Answer 28

Solfer-tetra chloride

Question 29

The only metal this is liquid at room temperature

Answer 29

Mercury

Question 30

Idea states that no 2 electrons in a atom can have the same set of four quantum numbers

Answer 30

Poli exclusion principle

Question 31

What type of nuclear decay occurs when a unstable atom ejects a clump of 2 protons and 2 neutrons

Answer 31

Alpha decay

Question 32

What type of radioactive decay releases energy without changing the number of protons and neutrons

Answer 32

Gamma decay

Question 33

A one way diffusion through a semi permeable membrane

Answer 33

Osmosis

Question 34

The strongest intermolecular force

Answer 34

Hydrogen bond

Question 35

Which of the following prefer is used when naming fluoride in a covalent molecule which would be used as SEF6

Answer 35

Hexa

Question 36

Which of the following is an atom that an opposite electric charge because of losing electrons

Answer 36

Cat ion