Est

Question 1

Ionic bond

Answer 1

Bond resulting from the gain or loss of electrons

Question 2

Covalent bond

Answer 2

Bond resulting from a sharing of electrons

Question 3

Effective force

Answer 3

The component of the applied force parallel to the direction of travel

Question 4

Mole

Answer 4

Unit of measure of the amount of a substance

Question 5

Isotopes

Answer 5

Atoms of the same element whose nuclei have different numbers of neutrons and therefore different atomic masses

Question 6

Radioactive isotopes

Answer 6

Atomic nucleus is unstable

Question 7

Contaminant

Answer 7

An agent that causes changes in the physical, chemical or biological properties of an environment or an organism

Question 8

Bioaccumulation

Answer 8

The process by which a contaminant from the environment or food supply accumulates in an organism

Question 9

Bioconcentration

Answer 9

A special case of bioaccumulation by which an organism accumulates a contaminant through direct contact with its environment (other than food)

Question 10

Toxicity treshold

Answer 10

The minimum concentration of a substance that produces a significant harmful effect in an organism (mg/kg of the organism mass)

Question 11

Allele

Answer 11

Possible form of a gene

Question 12

Homozygote

Answer 12

Individual with 2 identical alleles for a particular character trait

Question 13

Heterozygote

Answer 13

Individual with 2 different alleles for a particular character trait

Question 14

Buffering capacity of a soil

Answer 14

Ability to limit ph variation

Question 15

Factors that influence toxicity

Answer 15

Type of organism, duration of exposure, concentration

Question 16

Advantages of a good soil buffering capacity

Answer 16

Soil to maintain plant life, maintaining stable soil