Week 1 - Isotopes, atoms and climate reconstruction.

Question 1

Homogenous mixture?

Answer 1

Has a uniform appearance.

Question 2

Heterogenous mixture?

Answer 2

Has a variable appearance.

Question 3

Molecule?

Answer 3

Substance composed of 2 or more atoms.

Question 4

Compound?

Answer 4

Molecule with atoms of different elements. (If the atoms are the same elements its just still a molecule)

Question 5

Element?

Answer 5

Simplest form of a substance that can occur in nature.

Question 6

Atom?

Answer 6

Smallest unit of an element.

Question 7

True or false? The names of chemical substances only start with a capital letter if they begin a sentence?

Answer 7

True.

Question 8

Word cue - Negligable

Answer 8

The charge of a neutron
The mass of an electron
As they’re both zero

Question 9

Atomic number?

Answer 9

Number of protons in the nucleus.

Question 10

Mass number?

Answer 10

Number of protons and electrons in the nucleus.

Question 11

Isotope?

Answer 11

Atoms of same element and number of protons but a different number of neutrons.

Question 12

How is atomic mass measured?

Answer 12

relative to a 12C atom (So a usual carbon atom).

Question 13

What’s the relative atomic mass (RAM) of an element?

Answer 13

Overall mass of elements protons and neutrons when
off periodic table - simple rounded number top left of symbol
When on periodic table its average sum of the masses of the elements isotopes weighed based on their abundances - bottom number under symbol much more specific.

Question 14

Word cue -Water

Answer 14

• 16O and 18O water reservoir climate cycle
• Water is a Compound and made of Molecules and Atoms
• Structure of a water molecule?

Question 15

Temperature isotope relationship?

Answer 15

Water molecules containing heavier isotope evaporate less readily.

Question 16

Fractionation?

Answer 16

Disproportional evaporation.

Question 17

Calcareous?

Answer 17

(In animals); Extract calcium carbonate from water to form skeletal material.