Unit 8 Test

• Spread out around the room• Zero talking • No Computers• Number 1-40

1 )Based on his observations, the English chemist John Dalton formulated an atomic theory.

• In 1897, J.J. Thomson showed that negative charges could be made to move from one end of a cathode ray tube to another, causing the tube to glow. Because of this, Thomson is credited with the discover of the electron. Based on this information, which part of Dalton’s atomic theory conflicted with Thomson’s new data

• A) 1 B) 2 C) 3 D) 4

Dalton’s Atomic Theory1) All elements are made up of tiny indivisible particles called atoms

2) Atoms of the same element are identical. The atoms of one element are different from the atoms of another element

3) Atoms of different elements chemically combine to form chemical compounds

4) During chemical reactions, atoms are rearranged. Atoms of one element cannot be changed into atoms of a different element as a result of a chemical change.

• 2) Element X has two known naturally occurring isotopes. The mass and relative abundance of each isotope are shown below.

• What is the average atomic mass of Element X to the nearest hundredth of an atomic mass unit?

a.78.92 c.80.92b.79.91 d.7990.86

Relative Abundance Mass (amu)50.57% 78.92

49.43% 80.92

3

• Rutherford’s gold foil experiment gave evidence of an atom’s

• A.alpha particles• B.charge• C.size• D.nucleus

4

• Silicon - 30 contains 14 protons. It also contains

• A.30 neutrons• B.44 neutrons• C.16 neutrons• D.16 electrons

5

• The three types of nuclear radiation in order of increasing penetrating ability are

• A.gamma, beta, alpha• B.alpha, beta, gamma• C.beta, alpha, gamma• D.gamma, alpha, beta

6

• Fission is the splitting of one large nucleus into two smaller nuclei. In contrast, fusion is two small nuclei

• A.becoming one larger nucleus• B.becoming four smaller nuclei• C.forming a chemical bond• D.remaining unreactive

7• Where are the subatomic particles found?• A.protons and neutrons are inside the nucleus

and the electrons are outside the nucleus• B.protons and neutrons are outside the nucleus

and the electrons are inside the nucleus• C.protons and electrons are inside the nucleus

and the neutrons are outside the nucleus• D.neutrons and electrons are outside the

nucleus and protons are inside the nucleus

8

• The smallest unit of an element that still retains the properties of that element are

a.Electronsb.Neutronsc.Protonsd.atoms

9• According to the law of conservation of

mass, when sodium, hydrogen, and oxygen react to form a compound the mass of the compound is _____ compared to the sum of the masses of the individual elements.

a.greater thanb.less thanc.equal tod.either less than or greater than

10

• A positively charged particle with a mass of 1.673 x 10-24 grams is a(n)

a.Protonb.Neutronc.electrond.positron

11

• A chemical symbol represents the ____ of an element.

• a. name • b. reaction • c. group • d. pimpness

12

• Horizontal rows of the periodic table are called ____.

• a. periods • b. clusters • c. families • d. hammocks

13

• Atoms of the same element with different numbers of neutrons are called ____.

• a. isotopes • b. metals • c. metalloids • d. losers

14

• A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.

• a. 26 • b. 56 • c. 52 • d. HUGE

15

• Who discovered the nucleus by bombarding gold foil with positively charged particles and noting that some particles were widely deflected?

• a. Rutherford • b. Dalton • c. Chadwick • d. Your Mom

16

• A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)

• a. nuclide. • b. neutron. • c. electron. • d. Wanna Be

17

• Helium-4 and helium-3 are• a. isotopes. • b. different elements. • c. compounds. • d. Words and Numbers, booyah

18• The atomic number of oxygen, 8, indicates

that there are eight• a. protons in the nucleus of an oxygen

atom. • b. oxygen nuclides. • c. neutrons outside the oxygen atom's

nucleus. • d. good backstreet boys songs, haha just

kidding. Theres 7

19

• The total number of protons and neutrons in the nucleus of an atom is its

• a. atomic number. • b. Avogadro constant. • c. mass number. • d. secret to life

20

• An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is

• a. 13. • b. 14. • c. 27. • d. unknowable because I dont study

21

• What is the atomic number for aluminum from the figure below?

• a. 13 • b. 14 • c. 26.98 • d. R

13Al26.98

22

• In the figure, a neutral atom of silicon contains

• a. 14 electrons. • b. 28.09 electrons. • c. 16 electrons. • d. J-Lo’s booty

14Si28.09

23

• Zn-66 (atomic number 30) has• a. 30 neutrons. • b. 33 neutrons. • c. 36 neutrons. • d. the munchies

24• Chlorine has atomic number 17 and mass

number 35. It has• a. 17 protons, 17 electrons, and 18

neutrons. • b. 35 protons, 35 electrons, and 17

neutrons. • c. 17 protons, 17 electrons, and 52

neutrons. • d. Earth, Wind, & Fire

Part of AtomLocation in

atom(A) nucleus(B) outside

(C) in between

Charge(A) positive (B) negative(C) neutral

Mass(A) 1 (B) 0(C) 42

Proton 25)_____ 28)_____ 31)_____

Electron 26)_____ 29)_____ 32)_____

Neutron 27)_____ 30)_____ 33)_____