Biochemistry

Question 0

What holds atoms together?

Answer 0

chemical bonds

Question 1

a Molecule is a collection of _____ connected to one another

Answer 1

Atoms

Question 2

how are chemical bonds created?

Answer 2

+2 atoms sharing electrons that orbit around them often create chemical bonds

Question 3

molecules reshuffle atoms and trade with one another in the process of ________

Answer 3

chemical reaction

Question 4

atoms

Answer 4

any physical thing living or nonliving is made up of this basic unit of matter

Question 5

Atoms consist of three subatomic particles which are :

Answer 5

• protons - positive charge (Inside the nucleus)
• neutrons - neutral charge (Inside the nucleus)
• electrons - negative charge (outside the nucleus)

Question 6

Element

Answer 6

One particular type of Atom found on the periodic table at that cannot be separated

Question 7

four elements that make up 96.5% of the total weight of a human being

Answer 7

carbon nitrogen hydrogen and oxygen

Question 8

bohr’s model shows

Answer 8

electrons surround the nucleus in regions called energy levels

Question 9

how much electrons does each shell have

Answer 9

first one has two electrons

all other ones have eight electrons

Question 10

compounds

Answer 10

substance made of atoms of different elements are often linked or chemically bonding together

Question 11

the ____ of a compound determines the function

Answer 11

shape

Question 12

compounds properties are often ______ from the properties of the elements that end up making together

Answer 12

different

Question 13

Ions

Answer 13

an atom that has gained or lost one or more electrons

Question 14

The type of Ion that forms depends on the number of ______ in an atoms outer energy level or valance

Answer 14

electrons

Question 15

hydrogen is needed to produce

Answer 15

Chemical energy

Question 16

calcium is needed for

Answer 16

muscle movement

Question 17

chloride is needed for

Answer 17

Chemical signals (also potassium) to brain

Question 18

ionic bonds are formed thru ____

Answer 18

electrical forces oppositely charged ions

One or more electrons are transferred so both elements now have a full outer shell

Question 19

how do all atoms complete an outershell?

Answer 19

when they come in contact with other items they tend to want to give up or gain electrons

Question 20

Covalent bond

Answer 20

electrons are shared between two or more atoms of elements to gain full outer shells

Question 21

water is a ____ molecule

Answer 21

polar molecule