Fundamentals of Chemistry

Question 1

When writing symbols, what value goes in position "Z"?

Accepted Answer

atomic number

Question 2

What characteristic best describes what happens during a physical change?

Accepted Answer

composition (formula) stays the same

Question 3

The average atomic mass of magnesium is the weighted average of the atomic masses of

Accepted Answer

all of the naturally occurring isotopes of Mg

Question 4

A liquid changes rapidly into a gas at the liquid's___ ?

Accepted Answer

boiling point

Question 5

If an element has an atomic number of 7 and an atomic mass of 14, there must be

Accepted Answer

7 protons and 7 neutrons in the nucleus of the element

Question 6

Each element is unique and different from other elements because of its

Accepted Answer

atomic number

Question 7

The particles which have equal but opposite electrical charges are

Accepted Answer

protons and electrons

Question 8

How many electrons are in a chromium(III) ion, 24Cr+3?

Accepted Answer

21

Question 9

One isotope of oxygen differs from another isotope of oxygen in:

Accepted Answer

the mass

Question 10

In area B, which description below describes what is happening in the heating curve?

Accepted Answer

melting or freezing

Question 11

If an atom was left undisturbed for several years, which of the following is likely to happen?

Accepted Answer

nothing

Question 12

Whose atomic model is this with electrons in defined orbits?

Accepted Answer

Bohr

Question 13

What number indicates an electron?

Accepted Answer

3

Question 14

Which of the following isotopes of zinc is the lightest?

Accepted Answer

zinc - 64

Question 15

What is the mass number of this element?

Accepted Answer

59

Question 16

Whose atomic model is this?

Accepted Answer

Rutherford

Question 17

When writing symbols, what value goes in position "A"?

Accepted Answer

mass number

Question 18

The positively charged particles of an atom are the ________.

Accepted Answer

protons

Question 19

How many protons are in the neutral atom shown below?

Accepted Answer

12

Question 20

Who discovered that: 'the mass of the atom is concentrated in the nucleus"?

Accepted Answer

Ernest Rutherford

Question 21

How does S-2 differ from a neutral sulfur atom?

Accepted Answer

number of electrons

Question 22

Which is the mass number of K+ having 18 electrons, 19 protons, and 20 neutrons?

Accepted Answer

39

Question 23

Where is most of the mass in an atom located?

Accepted Answer

in the nucleus

Question 24

What is between the nucleus and the electrons in an atom?

Accepted Answer

nothing

Question 25

The mass of an electron is _____.

Accepted Answer

almost zero

Question 26

The particles with no charge in an atom are the _______.

Accepted Answer

neutrons

Question 27

What property stays the same during physical and chemical changes?

Accepted Answer

mass

Question 28

Why do atoms have an overall charge of zero?

Accepted Answer

the number of protons equal the number of electrons

Question 29

What is true of an atom consisting of 2 protons, 2 electrons, and 2 neutrons?

Accepted Answer

all of these are true

Question 30

Oxygen’s atomic number is 8. This means that an oxygen atom must always have

Accepted Answer

8 protons

Question 31

Name this atomic model

Accepted Answer

plum pudding model

Question 32

What number indicates a proton?

Accepted Answer

1

Question 33

What are the differences between the isotopes of hydrogen shown below?

Accepted Answer

the mass number and the number of neutrons

Question 34

Which atom consists of 13 protons, 14 neutrons, and 10 electrons?

Accepted Answer

aluminum ion

Question 35

Whose symbols are used on the modern periodic table?

Accepted Answer

Berzelius'

Question 36

Who discovered that the atom was mostly empty space?

Accepted Answer

Rutherford

Question 37

Particles of a liquid must _____ in order to freeze.

Accepted Answer

slow down

Question 38

The negatively charged particles of an atom are the ______.

Accepted Answer

electrons

Question 39

The columns on the periodic table are called...

Accepted Answer

groups

Question 40

What characteristic of an atom is determined by the number of electrons?

Accepted Answer

reactivity

Question 41

A homogeneous mixture of metals is called a(n)...

Accepted Answer

alloy

Question 42

How many protons are in Sc+2?

Accepted Answer

21

Question 43

What is the charge of an ion that has 16 protons and 20 electrons?

Accepted Answer

-4

Question 44

How many neutrons are in the atom shown below?

Accepted Answer

26

Question 45

The more kinetic energy that is present, the....

Accepted Answer

higher the temperature

Question 46

What is the number of neutrons in a neutral atom having 87 electrons and a mass of 223 amu?

Accepted Answer

136

Question 47

Carbon-14 is an isotope of carbon (atomic number 6). How many neutrons are in this atom?

Accepted Answer

8

Question 48

When writing symbols, what value goes in position "C"?

Accepted Answer

charge

Question 49

What number indicates the nucleus?

Accepted Answer

4

Question 50

An atom like sodium can become a positively charged ion. How does this happen?

Accepted Answer

it loses electrons

Question 51

What characteristic of an atom is determined by the number of protons?

Accepted Answer

identity

Question 52

When an atom of 20 atomic mass units loses an electron, the atom’s mass

Accepted Answer

remains constant

Question 53

Which state of matter can change both its shape and volume?

Accepted Answer

gas

Question 54

How many neutrons are contained in an iodine nucleus with a mass number of 131?

Accepted Answer

78

Question 55

How many protons and electrons are in a +2 copper-64 ion?

Accepted Answer

29 protons, 27 electrons

Question 56

What are rows on the periodic table?

Accepted Answer

energy levels

Question 57

Energy is absorbed in which type of chemical reaction?

Accepted Answer

endothermic

Question 58

In these mixtures, the individual particles are too small to see and look the same throughout.

Accepted Answer

homogeneous

Fundamentals of Chemistry

Questions 58

Fundamentals of Chemistry

Questions 58