Chemistry Midterm 21-22

Last updated about 4 years ago

35 questions

Note from the author:

1

10

1

7

2

1

Required

1

5

4

3

1

5

1

5

Required

3

1

Required

1

Library

Chemistry Midterm 21-22

Last updated about 4 years ago

35 questions

Note from the author:

This is a summative assessment that covers the following topics:
History of Chemistry
Matter and changes (physical and chemical)
Atomic structure
Atomic Theory
History of the Periodic Table
Classification of elements and their characteristics.

1

10

1

7

2

A ____________________  is a change where some physical properties change but the composition remains the same.
A ____________________  occurs when the substance changes its composition completely.

Smallest particle of matter that still retains its properties is called:

1

5

4

Draggable item		Corresponding Item

3

Draggable item		Corresponding Item

1

5

Draggable item		Corresponding Item

1

How many valence electrons does antimony have?

5

Required

3

The group of elements in the periodic table that is known as the alkali metals is _______ 
The noble gases are group _______ 
Of the whole periodic table, about _______  percent of elements is classified as metals.

1

How many elements are in the periodic table?

Required

1

A fictitious element X is composed of 10.0 percent of the isotope X-55, 20.0 percent of the isotope X-56, and 70.0 percent of the isotope X-57. Estimate the atomic mass of element X.

This is a summative assessment that covers the following topics:
History of Chemistry
Matter and changes (physical and chemical)
Atomic structure
Atomic Theory
History of the Periodic Table
Classification of elements and their characteristics.

It is defined as the discipline that studied matter as early as 400 BC. It had the purpose of finding the way to the perfect health and the transformation of materials of lesser value into the perfect metal.

Astronomy

Alchemy

Physical Science

Chemistry

Area of science that studies matter and the changes it can go through as well as its composition, properties and structure.

Astronomy

Chemistry

Alchemy

Physical Science

Select those that are contributions of Lavoisier

Created the Law of conservation of mass

Named Oxygen

Contributed with evidence that supports the Law of conservation of mass

Creating the Phlogiston theory

Disproving the Phlogiston theory

Created a very precise scale to measure weight

It is defined as knowledge acquired in a systematic way, based on careful and methodical experimentation.

Empirical Knowledge

Scientific Knowledge

Which of the following are pure substances?

colloids

solutions

suspensions

elements

A substance represented by a chemical formula is known as:

An element

A compound

A heterogeneous mixture

A homogeneous mixture

State of Matter is a chemical property of matter

True

False

Classify the following into Pure Substances and Mixtures

Tomato Sauce
Potassium
Pepto Bismol
Paracetamol
Copper
Table sugar
Water
Shampoo
Milk
Liquid soap

Pure substance
Mixture

A substance is made up of only one kind of atom is a (an)

solution

compound

homogeneous mixture

element

Which of the following is a characteristic of a mixture?

contains only pure substances

has varying properties

has a fixed composition

can always be separated by distillation

Which of the following is a chemical change?

water breaking down into hydrogen and oxygen

water boiling

ice being carved

ice melting

Which state of matter has a definte volume?

liquid

gas

solid

Separating a solid from a liquid by evaporating the liquid is called...

condensation

filtration

distillation

solution

What is the difference between a mixture and a compound?

Fixed composition
Can only be separated by chemical means
Varied composition
It may contain more than one phase
Scatters light
Its appearance may be uniform or not.
Can be separated by physical means

Mixture
Compound

A ____________________  is a change where some physical properties change but the composition remains the same.
A ____________________  occurs when the substance changes its composition completely.

What happens to matter during a chemical reaction?

Some matter is created

Some matter is destroyed

Some matter is destroyed and some is created

Matter is neither destroyed nor created

Which of the following phase is an endothermic change?

Which of the following phase is an exothermic change?

On the sun, where temperatures are extremely high, matter exists in a state know as plasma

True

False

Smallest particle of matter that still retains its properties is called:

Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?

Compounds are made by combining atoms.

Atoms are indivisible particles.

Atoms of different elements can combine with one another in simple whole number ratios.

Atoms of the same element are identical.

Match the item with the statement

Positively charged subatomic particle
Negatively charged subatomic particle
the number of them is the same as the atomic number of an element
the smallest particle of an element that retains the properties of that element
the central part of the atom, positively charged.

atom
electron
proton
nucleus

Match each item with the correct statement.

Draggable item		Corresponding Item
isotope		total number of particles that make up the nucleus of an atom
mass number		the weighted average of the masses of the isotopes of an element
atomic mass		number of protons in the nucleus of an atom
atomic number		atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom

Match the person to the proposed model of the atom

Draggable item		Corresponding Item
Ernest Rutherford		Billiard Ball Model
John Dalton		Plum pudding Model
JJ Thomson		Nuclear Atom

Werner Heisenberg stated the "uncertainty principle" that you can't know both position and velocity of a particle

True

False

Draggable item		Corresponding Item
group		horizontal row in the periodic table
electrons		vertical column in the periodic table
period		A repetition of properties occurs when elements are arranged in order of increasing atomic number
electronegativity		subatomic particles that are transferred to form positive and negative ions
periodic law		ability of an atom to attract electrons when the atom is in a compound

Categories of elements in the periodic table

Figure 5-1 shows a portion of a blank periodic table. Identify the segments labeled A and B.

A and B are both periods.

A and B are both groups.

A is a group and B is a period.

A is a period and B is a group.

What is another name for the representative elements?

Group A elements

Group B elements

Group C elements

Group D elements

What is the charge of a cation?

Positive

Negative

No charge

Depends on the size of the nucleus

How many valence electrons does antimony have?

Classify the statement as a characteristic of the type of element

The group of elements in the periodic table that is known as the alkali metals is _______ 
The noble gases are group _______ 
Of the whole periodic table, about _______  percent of elements is classified as metals.

How many elements are in the periodic table?

A fictitious element X is composed of 10.0 percent of the isotope X-55, 20.0 percent of the isotope X-56, and 70.0 percent of the isotope X-57. Estimate the atomic mass of element X.

It is defined as the discipline that studied matter as early as 400 BC. It had the purpose of finding the way to the perfect health and the transformation of materials of lesser value into the perfect metal.

Astronomy

Alchemy

Physical Science

Chemistry

Area of science that studies matter and the changes it can go through as well as its composition, properties and structure.

Astronomy

Chemistry

Alchemy

Physical Science

Select those that are contributions of Lavoisier

Created the Law of conservation of mass

Named Oxygen

Contributed with evidence that supports the Law of conservation of mass

Creating the Phlogiston theory

Disproving the Phlogiston theory

Created a very precise scale to measure weight

It is defined as knowledge acquired in a systematic way, based on careful and methodical experimentation.

Empirical Knowledge

Scientific Knowledge

Which of the following are pure substances?

colloids

solutions

suspensions

elements

A substance represented by a chemical formula is known as:

An element

A compound

A heterogeneous mixture

A homogeneous mixture

State of Matter is a chemical property of matter

True

False

Classify the following into Pure Substances and Mixtures

Tomato Sauce

Potassium

Pepto Bismol

Paracetamol

Copper

Table sugar

Water

Shampoo

Milk

Liquid soap

Pure substance

Mixture

A substance is made up of only one kind of atom is a (an)

solution

compound

homogeneous mixture

element

Which of the following is a characteristic of a mixture?

contains only pure substances

has varying properties

has a fixed composition

can always be separated by distillation

Which of the following is a chemical change?

water breaking down into hydrogen and oxygen

water boiling

ice being carved

ice melting

Which state of matter has a definte volume?

liquid

gas

solid

Separating a solid from a liquid by evaporating the liquid is called...

condensation

filtration

distillation

solution

What is the difference between a mixture and a compound?

Fixed composition

Can only be separated by chemical means

Varied composition

It may contain more than one phase

Scatters light

Its appearance may be uniform or not.

Can be separated by physical means

Mixture

Compound

What happens to matter during a chemical reaction?

Some matter is created

Some matter is destroyed

Some matter is destroyed and some is created

Matter is neither destroyed nor created

Which of the following phase is an endothermic change?

sublimation

deposition

condensation

freezing

vaporization

Which of the following phase is an exothermic change?

sublimation

freezing

deposition

condensation

vaporization

On the sun, where temperatures are extremely high, matter exists in a state know as plasma

True

False

Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?

Compounds are made by combining atoms.

Atoms are indivisible particles.

Atoms of different elements can combine with one another in simple whole number ratios.

Atoms of the same element are identical.

Match the item with the statement

Positively charged subatomic particle

Negatively charged subatomic particle

the number of them is the same as the atomic number of an element

the smallest particle of an element that retains the properties of that element

the central part of the atom, positively charged.

atom

electron

proton

nucleus

Match each item with the correct statement.

isotope

total number of particles that make up the nucleus of an atom

mass number

the weighted average of the masses of the isotopes of an element

atomic mass

number of protons in the nucleus of an atom

atomic number

atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom

Match the person to the proposed model of the atom

Ernest Rutherford

Billiard Ball Model

John Dalton

Plum pudding Model

JJ Thomson

Nuclear Atom

Werner Heisenberg stated the "uncertainty principle" that you can't know both position and velocity of a particle 

True

False

group

horizontal row in the periodic table

electrons

vertical column in the periodic table

period

A repetition of properties occurs when elements are arranged in order of increasing atomic number

electronegativity

subatomic particles that are transferred to form positive and negative ions

periodic law

ability of an atom to attract electrons when the atom is in a compound

Categories of elements in the periodic table

Metals

Carbons

Noble gases

Gases

Nonmetals

Metalloids

Figure 5-1 shows a portion of a blank periodic table. Identify the segments labeled A and B.

A and B are both periods.

A and B are both groups.

A is a group and B is a period.

A is a period and B is a group.

What is another name for the representative elements?

Group A elements

Group B elements

Group C elements

Group D elements

What is the charge of a cation?

Positive

Negative

No charge

Depends on the size of the nucleus

Classify the statement as a characteristic of the type of element

Metals

Nonmetals

Lose valence electrons when making compounds

Have high electronegativity values

Most are solids

If solid, they're brittle

Most have low boiling points

	Metals	Nonmetals
Lose valence electrons when making compounds
Have high electronegativity values
Most are solids
If solid, they're brittle
Most have low boiling points