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Chemistry Midterm 21-22

Last updated almost 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

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.

1

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

1

Select those that are contributions of Lavoisier

1

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

1

Which of the following are pure substances?

1

A substance represented by a chemical formula is known as:

1

State of Matter is a chemical property of matter

10

Classify the following into Pure Substances and Mixtures

  • Water
  • Table sugar
  • Pepto Bismol
  • Shampoo
  • Tomato Sauce
  • Liquid soap
  • Potassium
  • Copper
  • Milk
  • Paracetamol
  • Pure substance
  • Mixture
1

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

1

Which of the following is a characteristic of a mixture?

1

Which of the following is a chemical change?

1

Which state of matter has a definte volume?

1

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

7

What is the difference between a mixture and a compound?

  • Can be separated by physical means
  • Scatters light
  • Can only be separated by chemical means
  • It may contain more than one phase
  • Varied composition
  • Its appearance may be uniform or not.
  • Fixed composition
  • Mixture
  • Compound
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.
Other Answer Choices:
apparent change
chemical change
physical change
combustion reaction
1

What happens to matter during a chemical reaction?

1

Which of the following phase is an endothermic change?

1

Which of the following phase is an exothermic change?

1

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

Required
1

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

1

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

5

Match the item with the statement

  • Positively charged subatomic particle
  • the central part of the atom, positively charged.
  • Negatively charged subatomic particle
  • the smallest particle of an element that retains the properties of that element
  • the number of them is the same as the atomic number of an element
  • atom
  • electron
  • proton
  • nucleus
4

Match each item with the correct statement.

Draggable itemCorresponding Item
atomic number
total number of particles that make up the nucleus of an atom
isotope
the weighted average of the masses of the isotopes of an element
mass number
number of protons in the nucleus of an atom
atomic mass
atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom
3

Match the person to the proposed model of the atom

Draggable itemCorresponding Item
JJ Thomson
Billiard Ball Model
Ernest Rutherford
Plum pudding Model
John Dalton
Nuclear Atom
1

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

5
Draggable itemCorresponding Item
periodic law
horizontal row in the periodic table
period
vertical column in the periodic table
electronegativity
A repetition of properties occurs when elements are arranged in order of increasing atomic number
group
subatomic particles that are transferred to form positive and negative ions
electrons
ability of an atom to attract electrons when the atom is in a compound
1

Categories of elements in the periodic table

1

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

1

What is another name for the representative elements?

1

What is the charge of a cation?

1

How many valence electrons does antimony have?

5

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
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.