General Chemistry - 1st Session Examination

Question 1

type of substance that is made up of one type of atom

Answer 1

element

Question 2

a type of substance that is made up of two or more types of atoms

Answer 2

compound

Question 3

have particles that are very close to each other in a highly organized arrangement, which is why they have a fixed volume and shape

Answer 3

solid

Question 4

have particles that are slightly farther apart from each other but are close enough to allow them to flow and have a definite volume.

Answer 4

liquid

Question 5

have particles that are very far apart from each other, which is why they expand and assume their container’s shape and volume.

Answer 5

gas

Question 6

The phase change from solid to liquid is called

Answer 6

melting or fusion

Question 7

The phase change from liquid to gas is called

Answer 7

boiling, evaporation, vaporization

Question 8

The phase change from solid to gas is called

Answer 8

sublimation

Question 9

is a form of matter whose composition and properties are constant within a given sample or among different samples.

Answer 9

pure substance

Question 10

Which of the following refers to a form of matter whose components may be separated from each other by physical means?

Answer 10

mixture

Question 11

Which of the following phase changes does not happen when matter is heated?

Answer 11

condensation

Question 12

Which term refers to a charged particle or a set of charged particles?

Answer 12

ion

Question 13

Who proposed that matter is made up of tiny indivisible particles?

Answer 13

democritus

Question 14

Which statement(s) adheres to the principles of the particulate nature of matter?

1 - Particles of matter are in constant and random motion.

2 - Particles of matter are steady and in fixed positions.

3 - Particles of matter are held or repelled by forces.

Answer 14

1 and 3

Question 15

general properties of matter?

Answer 15

density, mass, and volume

Question 16

Which of the following statements is true about mass and weight?

Answer 16

mass is constant while weight varries

Question 17

physical properties that do not depend on the amount of matter

ex. density, specific gravity

Answer 17

intensive properties

Question 18

physical properties that depend on the amount of matter

ex. mass and volume

Answer 18

extensive properties

Question 19

Which properties should be considered in designing electrical components?

1 - high conductivity

2 - high ductility

3 - low reactivity

4 - low melting point

Answer 19

1, 2, and 3

Question 20

Which pair of physical properties and units of measurement is incorrect?

1 - mass: kg

2 - density: g/cm³

3 - volume: cm

4 - specific gravity: N

Answer 20

3 and 4

Question 21

What is the simplest form of a substance?

Answer 21

element

Question 22

statement that correctly differentiates pure substances from mixtures

Answer 22

Pure substances have fixed or definite composition while mixtures do not have

Question 23

Element X is ductile, malleable, and is a good conductor of heat and electricity. What is the classification of element X?

Answer 23

metal

Question 24

What is the best way to determine whether a given mixture is a colloid?

Answer 24

letting a beam of light pass through it and see if the light is scattered

Question 25

Which of the following statement(s) is true about compounds? 1 Compounds are pure substances. 2Compounds have the same properties as the elements that comprise it. 3 Compounds have components that cannot be separated by chemical means. 4 Compounds may be grouped according to the specific elements that are present.

Answer 25

1 and 4

Question 26

Which shows the correct grouping(s) of physical properties of elements? 1 metal - high tensile strength, high melting point, high conductivity 2 nonmetal - lustrous, ductile, malleable 3 metalloid - semiconductors, lustrous, ductile

Answer 26

1 and 3

Question 27

Compound X is composed of carbon, hydrogen, and oxygen atoms. The ratio of its hydrogen to carbon and oxygen atoms is 2:1. What kind of organic compound is compound X?

Answer 27

carbohydrates

Question 28

Which of the following is not true about pure substances?

Answer 28

cannot be broken down through ordinary means.

Question 29

Sodium hydroxide is one of the main components in making soaps. What is the correct chemical formula for sodium hydroxide?

Answer 29

NAOH

Question 30

Which of the following elements is added in food supplements due to its significant role in bone development?

Answer 30

calcium (Ca)

Question 31

Sodium hydroxide is one of the main components in making soaps. What is the correct chemical formula for sodium hydroxide?

Answer 31

NaOH

Question 32

atoms of the elements are joined together

Answer 32

chemical bond

Question 33

processes that create compounds

Answer 33

chemical reaction

Question 34

primal matter water

Answer 34

thales

Question 35

primal matter earth

Answer 35

empedocles

Question 36

primal matter air

Answer 36

anixemenes

Question 37

primal matter fire

Answer 37

heraclitus

Question 38

component of fire that came from a Greek word for inflammable.

Answer 38

phlogiston

Question 39

Presented Law of Conservation of Mass

Answer 39

Antoine Lavoisier

Question 40

Before and after reaction, no matter is created nor destroyed

Answer 40

Law of conservation of mass

Question 41

stated that if a pure compound is broken down into its constituent elements, the masses of the constituents will always have the same proportions, regardless of the quantity or source of the original substance.

Answer 41

Law of definite proportion

Question 42

Presented law of definite proportion

Answer 42

Joseph Proust

Question 43

states that when two elements form a series of compounds, the masses of one that combine with a fixed mass of the other are in the ratio of (small) integers to each other.

Answer 43

LAW OF MULTIPLE PROPORTION

Question 44

Presented law of multiple proportions

Answer 44

John Dalton

Question 45

The electron is discovered using a

Answer 45

cathode ray tube

Question 46

discovered electron

Answer 46

joseph john thomson (JJ Thomson)

Question 47

discovered protons and neutrons

Answer 47

ernest rutherford

Question 48

proposed that the electrons move in orbits around the nucleus

Answer 48

neils borh, planetary model of an atom

Question 49

proposed that electrons do not move in a set of paths around the nucleus, but in waves.

Answer 49

Erwin Schrödinger, Electron Cloud Model

Question 50

Atoms of the same element that have the same number of protons and electrons but different numbers of neutrons

Answer 50

isotopes

Question 51

combination of two or more atomsconnected together by a strong force of interaction, making them behave as a single particle.

Answer 51

molecules

Question 52

negatively charged species

Answer 52

anion

Question 53

positively chargedspecies called

Answer 53

cation

Question 54

gives the simplest whole-number ratio of each element in a compound

Answer 54

empirical formula

Question 55

the most common chemical formula wherein symbols of each element are written down with a subscript indicating how many atoms are in the compound

Answer 55

molecular formula

Question 56

detailed chemical formulas that show the structure of a compound

Answer 56

structural formula

Question 57

compounds that are made of nonmetals chemically bonded to each other.

Answer 57

Covalent compounds

Question 58

hold the atoms together in a covalent compound. They are formed when one or more electrons are shared between two nonmetals.

Answer 58

Covalent bonds

Question 59

general rule of thumb that describes the tendency of atoms to have a complete set of eight electrons in their valence shell

Answer 59

octet rule