Elements Of Life

Question 0

What is empirical formula?

Answer 0

Simplest ratio of atoms in each element of a compound

Question 1

What’s Avogardo’s number?

Answer 1

6.02 x 10(23), the number of particulars in 1 mole of a substance

Question 2

What’s molecular formula?

Answer 2

The actual number of atoms of each element in a molecule

Question 3

What is a isotope?

Answer 3

Atoms of the same element that have the same atomic number but different mass numbers

Question 4

What is a radioisotope?

Answer 4

Isotopes with unstable nuclei

Question 5

Alpha radiation is stopped by?

Answer 5

Paper or skin

Question 6

Alpha radiation is what?

Answer 6

A helium nuclei

Question 7

Beta radiation can be stopped by what?

Answer 7

Aluminium foil

Question 8

Half life isn’t effected by what?

Answer 8

Temperature

Question 9

Tracers are followed by what?

Answer 9

Geiger Counters

Question 10

What is nuclear fusion?

Answer 10

The joining together of two or more nuclei to form a heavier nucleus of a new element

Question 11

Why are high temperatures and pressures needed in nuclear fusion?

Answer 11

To overcome the repulsion between the two positive nuclei

Question 12

Do electrons closest to the nucleus have the highest energy?

Answer 12

No, they have lowest

Question 13

Similarities between absorption and emission spectra?

Answer 13

Lines are in the same position and lines become closer together at higher frequencies

Question 14

What does the higher melting point ionic lattice or simple molecular?

Answer 14

Ionic lattice

Question 15

If a molecule has four groups of electrons, what bond angle will it have?

Answer 15

109*

Question 16

If a molecules has three groups of electrons, what’s its bond angle?

Answer 16

120*

Question 17

Mendeleev arranged his periodic table in order of what?

Answer 17

Atomic mass

Question 18

How do you remember reactions with the group 2 metals?

Answer 18

HYCATS

Question 19

In the sample inlet what are injected?

Answer 19

Liquid and gases, solids are heated to vaporise them

Question 20

In the ionisation area what occurs?

Answer 20

Electrons bombard the atoms or molecules knocking off electrons

Question 21

What happens in acceleration area?

Answer 21

Electric field accerlerates the ions

Question 22

In molecules why are there other peaks on the mass spectrometer ?

Answer 22

Fragments of the molecule