UMA Chemistry September2022

Question 1

How many neutrons are there in Lead?

Accepted Answer

125

Question 2

What is the formula for Vanadium III fluoride?

Accepted Answer

VFl3

Question 3

How much of a 50 microgram sample of Radon, with a half life of 8 days remain after 32 days?

Accepted Answer

3.125 micrograms

Question 4

What subatomic particle(s) are found in the nucleus?

Accepted Answer

Protons and Neutrons

Question 5

What is an alpha particle?

Accepted Answer

Helium nucleus

Question 6

A fossilized man had only 50 nanograms C14 left from the 200 nanogram original amount.The HL is 5700 yrs.How old is it?

Accepted Answer

11,400 years

Question 7

What begins with a statement of the problem?

Accepted Answer

Engineering Method

Question 8

What are variations of the same element with differing numbers of neutrons called?

Accepted Answer

An isotope

Question 9

What is the formula for aluminum oxide?

Accepted Answer

Al2O3

Question 10

When an atom obtains or gives up an electron, it is known as....

Accepted Answer

An ion

Question 11

What is plotted on the x-axis?

Accepted Answer

Independent Variable

Question 12

What is the atomic number?

Accepted Answer

The number of electrons and protons in an atom

Question 13

What does C14 (carbon 14) become if it loses an alpha particle?

Accepted Answer

Beryllium 10

Question 14

How many protons are there in Mercury?

Accepted Answer

80

Question 15

A subatomic particle with a negative charge with insignificant mass that orbits the nucleus is called...

Accepted Answer

An electron

Question 16

Who described the atom using the analogy of "plum pudding"?

Accepted Answer

Thompson

Question 17

Who is given credit as being the first to describe an atom (atomos)?

Accepted Answer

Democritus

Question 18

What is the atomic mass of Iron rounded off to the nearest whole number?

Accepted Answer

56

Question 19

A mixture of two or elements is called...

Accepted Answer

A compound, A molecule

Question 20

What is the chemical symbol for Gold?

Accepted Answer

Au

Question 21

What is the formula for magnesium chloride?

Accepted Answer

MgCl2

Question 22

What consists of research, question, hypothesis, experiment, results/analysis, report

Accepted Answer

Scientific Method

Question 23

How much time would have to pass for this 50 microgram sample of radon to be reduced to 6.25 micrograms?

Accepted Answer

24 days

Question 24

Who described the atom as a positively charged nucleus surrounded by electrons?

Accepted Answer

Rutherford

Question 25

The amount of time for one half of a radioactive element to decay is known as...

Accepted Answer

Half-life

Question 26

What is the name of the element with a symbol of Hg?

Accepted Answer

Mercury

Question 27

What subatomic particle has a positive charge?

Accepted Answer

Proton

UMA Chemistry September2022

Questions 27

UMA Chemistry September2022

Questions 27