Matter and Atoms in Chemistry

Question 1

What is the two word term used to describe an element that exists as a pair?

Answer 1

Diatomic molecule

Question 2

Question 3

Question 4

Which state of matter has particles close together in a fixed position that may be vibrating?

Answer 4

Solid

Question 5

In what reactions can we see the compound glucose being included?

Answer 5

photosynthesis and cellular respiration

Question 6

What is the two word term used to describe vanilla ice cream?

Answer 6

homogeneous mixture

Question 7

In which state of matter can the particles be easily compressed?

Answer 7

gas

Question 8

Which represents a compound?

• vanilla ice cream
• oxygen gas
• carbon dioxide

Answer 8

carbon dioxide

Question 9

The mass number of the atom is the total number of _______ and ______.

Answer 9

Protons and neutrons

Question 10

Isotopes are different types of atoms of the same element, but with a different number of

Answer 10

neutrons

Question 11

Carbon-13 is an isotope of Carbon with a mass number of 13. How many neutrons are in Carbon-13?

Answer 11

7

Question 12

Calculate the % abundance of the plain M&M isotope using the following formula: % abundance= (# of plain type of M&M)/(TOTAL # of all M&M’s) x 100 Enter your answer as a number only to represent that percentage.

Answer 12

20/25x100= 80% of plain M&Ms represented.

Question 13

Calculate the % abundance of the peanut M&M isotope using the following formula: % abundance= (# of peanut type of M&M)/(TOTAL # of all M&M’s) x 100 Enter your answer as a number only to represent that percentage.

Answer 13

5/25x100= 20% of Peanut M&Ms and 80% of plain M&Ms from previous question.

Question 14

Calculate the average “atomic mass” of your M&M’s.
Average Atomic Mass= ((mass of isotope 1/plain M&M)(% abundance from LabQ2.03 in decimal form)+ (mass of isotope 2/Peanut M&M)(% abundance from LabQ2.04 in decimal form)= answer with two sig figs

Answer 14

17.11 (.80) + 13.69 (.20)= 16.426% with two sig figs is 16

Question 15

How do Hydrogen-1, Hydrogen-2, and Hydrogen-3 differ from each other?

Answer 15

Their atomic ,asses are different

Question 16

Sulfur has 4 isotopes: sulfur-32 is 95.0%, sulfur-33 is 0.76%, sulfur-34 is 3.22%, and sulfur-36 is 0.89% abundant. Calculate its average atomic mass. Express your answer with five sig figs.

Answer 16

32.066

Question 17

What is the atomic number for Zinc?

Answer 17

30.0

Question 18

How many neutrons does Carbon 12 have?

Answer 18

6

Question 19

How many neutrons are in Sodium 23?

Answer 19

12

Question 20

What is a pure substance composed of?

Answer 20

composed of only one type of atom or molecule

Question 21

Which state of matter has atomic spacing that is far apart and has a definite shape?

Answer 21

none

Question 22

How would you classify salt water?

Answer 22

mixture - homogeneous

Question 23

Which statement best describes the process of the paint on a vehicle fading over time?

Answer 23

Chemical change because the paint molecules are changing composition.

Question 24

Which statement accurately describes the contributions of Dalton?

Answer 24

proposed the modern atomic theory

Question 25

What is the resulting particle called when an atom loses an electron?

Answer 25

cation

Question 26

A n elements has two isotopes, making up 50% of the population. Isotope 1 has a mass of 80.0 amu, Isotope 2 has a mass of 85.0 amu. Calculate the atomic mass of the element.

Answer 26

82.5 amu

Question 27

Using its placement on the periodic table, what is the charge on the barium ion?

Answer 27

2+

Question 28

How many electrons are in Br-?

Answer 28

35 protons so need 36 electrons to give it a -1 charge.

Question 29

In order, what is the freezing point and boiling point of water according to the Celsius scale?

Answer 29

0-100

Question 30

How much heat (kJ) is needed to raise the temperature of 100.0 grams of water from 25 degrees Celsius to 50 degrees Celsius?

Answer 30

Q=100gx 4.184 J/g/C x 50-25C= 10460 Joules which is 10.5 kJ

Question 31

What is a pure substance?

Answer 31

Composed of only one type of atom or molecule.

Question 32

What is a chemical property?

Answer 32

the tarnishing of a copper statue

Question 33

What is the value of 19 degrees Celsius on the Kelvin scale? Enter a number only.

Answer 33

19+273= 292K

Question 34

What is the final temperature of 25.0 grams of water at 22.0 degrees Celsius after it absorbs 454 J of heat? Enter a number only.

Answer 34

q= m C delta T q= 454 so set up is like this: 454 J= 25 g(4.184g/J/C) (final Tempor x-22) 454= 104.6 (x-22) 4.34= (x-22)= 26.3

Question 35

Which statement below accurately describes the contributions of Thomson?

Answer 35

discovered the existence of electrons

Question 36

Which statement is not consistent with the theory proposed by Rutherford?

Answer 36

Electrical charge is a fundamental property of protons and electrons in which like charges repel and opposite charges attract.

Question 37

What is an atom called when it gains an electron? Answer with one word only.

Answer 37

anion

Question 38

What is the correct formula for a potassium ion with 18 electrons?

Answer 38

K+

Question 39

Group IA elements are also called:

Answer 39

alkali metals

Question 40

Group 8A Elements are also called _____ _____.

Answer 40

noble gases

Question 41

Mg is a member of what family?

Answer 41

alkaline earth metals

Question 42

Isotopes are :

Answer 42

atoms of the same element that have different number of neutrons

Question 43

Given that the molecular mass of beryllium is 9.01 grams, which of the following isotopes would you expect to have the greatest natural abundance?

Answer 43

Be-9 | Since the mas is closest to 9, the isotope closest to 9 would be the most abundant.

Question 44

Which type of energy is associated with motion?

Answer 44

kinetic

Question 45

What is the value of 335 K on the Celsius temperature scale?

Answer 45

335-273= 62.

Question 46

When 49.5 J of heat was transferred to 7.3 g of iron at 22 degrees Celsius, the temperature of the iron increases to 37 degrees Celsius. What is the specific heat of iron in J/g/C?

Answer 46

0.45

Question 47

What is the correct chemical symbol of mercury? Enter symbol only.

Answer 47

Hg

Question 48

What is the charge on the ion formed by selenium?

Answer 48

2-