Science Chemistry

Question 1

A property shared by most covalent compounds

Answer 1

low melting points

Question 2

When an atom loses an electron it becomes a….

Answer 2

positive ion

Question 3

What is a double bond?

Answer 3

2 pairs of electrons shared between 4 atoms

Question 4

Electrons involved in bonding between atoms are…

Answer 4

valence electrons

Question 5

In the chemical formula for an ionic compound, which item is written first?

Answer 5

the name of the positive ion

Question 6

A mixture made of 2 or more elements, at least one of which is a metal is called an….

Answer 6

Alloy

Question 7

What makes metals be able to roll and fold

Answer 7

malleablitity

Question 8

What group contains the most reactive elements

Answer 8

alkali metals

Question 9

Ionic compounds that dissolve in water conduct electricity because they break up into _______________ that move freely

Answer 9

ions

Question 10

Solid metals are good conductors of heat and _________

Answer 10

electricity

Question 11

Molecular compounds that dissolve in water, do not conduct electricity because no __________ are present

Answer 11

non-polar particles (non-polar electrons)

Question 12

Because the electrons in a molecule of HF (hydrogen fluoride) are more strongly pulled toward the fluorine atom, the molecule is ________ also makes neutral ions

Answer 12

polar

Question 13

A metal crystal consist of positively charged metal ions embedded in a sea of freely moving _________

Answer 13

valence electrons

Question 14

True of False~ Orderly crystal shapes, high melting points, and electrical conductivity when dissolved in water are properties of ionic compounds.

Answer 14

True

Question 15

True or False~ When electrons are transferred between two atoms, a covalent bond is formed.

Answer 15

False, shared

Question 16

True or False~ A low melting point is one property of covalent compounds.

Answer 16

True

Question 17

True or False~ A non polar is formed when 2 atoms are shared unequally.

Answer 17

False, polar

Question 18

What type of bond takes place between 2 metals?

Answer 18

metallic

Question 19

What is the east reactive group?

Answer 19

noble gases

Question 20

Why are metallic electrons able to conduct electricity?

Answer 20

the electrons are free

Question 21

Water is an example of what bond?

Answer 21

covalent

Question 22

2 nonmetals make a…..

Answer 22

covalent bond

Question 23

What is in every nucleus?

Answer 23

protons and neutrons

Question 24

Sodium chloride is what type of bond? (NaCl)

Answer 24

covalent

Question 25

What's the difference between reactive and nonreactive?

Answer 25

Nonreactive are the noble gases, which don't bond. Reactive (everything else) does bond.