Chapter 4 Test PS

Question 1

How many neutrons are in this atom?

Accepted Answer

61

Question 2

What element is shown in the picture?

Accepted Answer

Silicon

Question 3

Isotopes of an element have the same atomic ________ but different atomic _________.

Accepted Answer

number; mass

Question 4

What period is Chlorine (Cl) in?

Accepted Answer

3

Question 5

Why do atoms have no charge?

Accepted Answer

Equal # protons and electrons

Question 6

How many protons are in this atom?

Accepted Answer

6

Question 7

Which is NOT a part of Dalton's atomic theory?

Accepted Answer

Atoms are constantly in motion

Question 8

How many valence electrons would atoms of the element sodium (Na) have?

Accepted Answer

1

Question 9

What element is this?

Accepted Answer

Carbon

Question 10

What is true about the nucleus?

Accepted Answer

Contains protons and neutrons and is positively charged

Question 11

Thomson's model is also called

Accepted Answer

plum pudding model

Question 12

What is the atomic mass number equal to?

Accepted Answer

protons plus neutrons

Question 13

Magnesium-25 has ____ protons and ______ neutrons

Accepted Answer

12,13

Question 14

How many moles are in 22 grams of argon?

Accepted Answer

0.55 moles

Question 15

What did John Dalton do?

Accepted Answer

Revised democritus' atomic theory

Question 16

Given that the number of electrons is 42 find the number of protons given the mass number is 96

Accepted Answer

42

Question 17

Magnesium (Mg) is in group...

Accepted Answer

2

Question 18

How many periods are there on the Periodic Table?

Accepted Answer

7

Question 19

Determine the mass of 0.75 mol of sulfur, atomic mass of 32 g/mol.

Accepted Answer

24 g

Question 20

How many grams are in 4.5 moles of sodium fluoride, NaF?

Accepted Answer

189 g

Question 21

Why did Democritus' theory fail?

Accepted Answer

Lack of evidence

Question 22

The molar mass of krypton is 83.80 g/mol. So, 5.00 mol of krypton is _____g

Accepted Answer

419 g

Question 23

Oxygen's atomic number is 8, this means that oxygen has

Accepted Answer

8 protons

Question 24

An atom of potassium has atomic mass of 39 & atomic # of 19, how many neutrons does it have?

Accepted Answer

20

Question 25

How many valence electrons does Neon (Ne) have?

Accepted Answer

8

Question 26

How many grams are in 2.4 moles of sulfur?

Accepted Answer

77 g

Question 27

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

Accepted Answer

1.26 moles

Question 28

What was one thing wrong with Dalton's theory?

Accepted Answer

Atoms of same elements can have different masses

Question 29

How many grams are in 11.9 moles of chromium?

Accepted Answer

619 g

Question 30

How many grams are in 0.02 moles of beryllium iodide, BeI2?

Accepted Answer

5.3 g

Question 31

Thomson’s study of cathode rays showed that atoms contain negatively charged particles called

Accepted Answer

electrons

Question 32

In a hyphenated symbol (fluorine-19) the 19 is the ____________________.

Accepted Answer

mass number

Question 33

The nucleus of an atom has a(n) _______________________electric charge

Accepted Answer

positive

Question 34

How many moles are in 9.8 grams of calcium?

Accepted Answer

0.24 moles

Question 35

What element is pictured?

Accepted Answer

Neon

Question 36

How do atoms behave in Bohr's model?

Accepted Answer

planets orbiting the sun

Question 37

Given the mass number is 63 and the number of protons is 29, find the number of neutrons

Accepted Answer

34

Question 38

What subatomic particle did Thomson discover?

Accepted Answer

electron

Question 39

What model did Thomson propose?

Accepted Answer

Plum Pudding Model

Question 40

How many valence electrons does Helium (He) have?

Accepted Answer

2

Question 41

Of the elements N, O, Cl, Na, and S, which two would likely have similar chemical properties?

Accepted Answer

Oxygen and Sulfur

Question 42

Who came up with the first theory of atoms?

Accepted Answer

Democritus

Question 43

How many electron shells does Phosphorus (P) have?

Accepted Answer

3

Question 44

The average atomic mass of cesium is 133 amu. What is the mass of 3 mol of cesium?

Accepted Answer

399 g

Question 45

You have 6.5 mol of chromium, which has a molar mass of 52g/mol, what is the mass?

Accepted Answer

338 g

Question 46

Given the mass number is 14 and the number of protons is 6, find the number of neutrons

Accepted Answer

8

Question 47

The mole is a SI unit that describes the

Accepted Answer

amount of a substance

Question 48

What is the first element in Group 2?

Accepted Answer

Berylium

Question 49

The word atom comes from a Greek word that means "unable to be

Accepted Answer

divided

Question 50

Atoms of same element with different numbers of _________ are called _________.

Accepted Answer

neutrons, isotopes

Question 51

How many grams are in 88.1 moles of magnesium?

Accepted Answer

2140 g

Question 52

Argon (Ar) is a....

Accepted Answer

Noble Gas

Question 53

How many moles are in 2.3 grams of phosphorus?

Accepted Answer

0.07 moles

Question 54

How many valence electrons would atoms of the element boron (B) have?

Accepted Answer

3

Question 55

What was wrong with Thomson's model?

Accepted Answer

He didn't include the nucleus in his model

Question 56

How many protons does 2813Al have?

Accepted Answer

13

Question 57

According to Bohr's theory, an electron's path around the nucleus defines its

Accepted Answer

energy level

Question 58

How many grams are in 238 moles of arsenic?

Accepted Answer

17,830.96 g

Question 59

What is the mass number of this isotope?

Accepted Answer

2`

Question 60

An atom gains energy by absorbing a light particle called a(n)

Accepted Answer

photon

Question 61

The first theory of atoms, was proposed by ____,

Accepted Answer

Democritus

Question 62

All isotopes of an element have the same atomic number ?

Accepted Answer

True

Question 63

What did Rutherford discover in 1911?

Accepted Answer

The nucleus exsisted

Question 64

Strontium 90 has a mass number of?

Accepted Answer

90

Chapter 4 Test PS

Questions 67

Chapter 4 Test PS

Questions 67