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WorksheetsChemistry: Atoms & Elements Unit Exam
Total questions: 60
Worksheet time: 1hrs 1mins
Which is a mixture that appears to be all the same throughout?
Compound
Homogeneous
Heterogeneous
Mechanical Mixture
The number of protons in a nucleus is knows as:
Neutrons
Electrons
Atomic Number
Atomic Mass
Which of the following is A change in which no new type of matter is produced?
Physical Change
Chemical Change
Change in Atoms
Atomic Structure Change
A subatomic particle that is found in the nucleus of an atom and has no charge is called an:
Nucleus
Protons
Neutrons
Electrons
The smallest particle of matter is known as:
A Compound
A Molecule
An Element
An Atom
The central part of the atom that consists of protons and neutrons is called a(n):
Nucleus
Protons
Neutrons
Electrons
A subatomic particle that has a negative charge is called a(n):
Proton
Neutron
Electron
Nucleus
A pure substance that can not be broken down into a simpler substance is a(n):
Compound
Element
Solution
Water
A mixture in which the different parts are easily able to be seen is known as:
Compound
Homogenous
Heterogeneous
Properties
A pure substance made of two or more different elements combined in a definite proportion is called a(n):
Compound
Element
Solution
Mechanical Mixture
Chemical symbols that represent a compound or molecule are called:
Elements
Chemical Symbols
Molecules
Chemical Formula
A subatomic particle that is found in the nucleus with a positive charge is called:
Proton
Neutron
Electron
Element
A particle that is formed when any two or more atoms combine is called:
Element
Compound
Atom
Molecule
Check which of the following are indicators that a chemical change has occurred:
Colour Change
Phase Change
Precipitate Formed
Change in Size
Bubbles Formed
When an atom has more protons than electrons, what charge will the atom have?
No Charge
Positive
Negative
Which property describes how smooth or rough the substance feels?
Malleability
Hardness
Texture
Lustre
Any of two or more forms of an element, each with the same number of protons but with different numbers of neutrons is known as a(n):
Proton
Ion
Isotope
Electron
An atom that has a charge due to loss or gain of an electron is known as a(n):
Proton
Ion
Isotope
Electron
An electron in the outer most shell/orbit/ring of an atom is known as a(n):
Ion
Isotope
Proton
Valence Electron
Elements that are shiny, good conductors and are located on the left side of the ladder on the periodic table are known as:
Metals
Non - Metals
Metalloids
Halogens
The horizontal rows on the periodic table are known as:
Groups
Families
Columns
Periods
An atom that has the same number of protons as electrons, what charge will the atom have?
No Charge
Positive Charge
Negative Charge
All of the above
Which scientist coined the term ATOM, coming from the greek work “atomos” meaning indivisible?
JJ Thomson
John Dalton
Democritus
Earnest Rutherford
Which famous scientist believed in the 4 element model: Earth, Air, Wind & Fire?
Aristotle
Einstein
Democritus
JJ Thomson
Which scientist believed the structure of the atom resembled plum pudding or a chocolate chip cookie?
JJ Thomson
Niels Bohr
Aristotle
Ernest Rutherford
Which scientist performed the Gold Foil Experiment to discover that the atom has a positive nucleus?
John Dalton
Einstein
JJ Thomson
Ernest Rutherford
Which scientist discovered that electrons do not move randomly but in orbits certain distances from the nucleus?
John Dalton
Niels Bohr
Earnest Rutherford
Democritus
Elements that have properties of both metals and nonmetals are known as:
Halogens
Metalloids
Alkali Metals
Diatomics
Which of the following elements is Diatomic?
Sodium, Na
Helium, He
Magnesium, Mg
Chlorine, Cl
The elements that are dull, mostly insulators and are found to the right of the ladder on the periodic table are called:
Metals
Non Metals
Metalloids
Diatomics
The property that describes how shiny or dull a substance appears is known as:
Ductility
Density
Malleability
Lustre
The property that describes how thick or thin and how freely a liquid flows is known as:
Density
Boiling point
Viscosity
Melting Point
Anything that has mass/volume and takes up space is known as:
Compounds
Matter
Elements
Properties
Water (H2O) is an example of a(n):
Element
Compound
Mechanical Mixture
Solution
Trail mix (nuts, raisins, cereals) is an example of a(n):
Element
Compound
Mechanical Mixture
Solution
Argon is an example of a(n):
Element
Compound
Mechanical Mixture
Solution
Salt with the formula NaCl, is an example of a(n):
Element
Compound
Homogenous Mixture
Heterogeneous Mixture
A class of iced tea, as seen here, would be classified as a(n):
Element
Compound
Homogeneous Mixture
Heterogeneous
The property that describes the resistance of a solid to be scratched is called:
Hardness
Mallerability
Ductility
Solubility
The property that describes the ability of a substance to dissolve in a solvent (water) is called:
Hardness
Malleability
Ductility
Solubility
Pure elements that form molecules consisting of 2 atoms are known as:
Halogens
Metals
Diatomics
Nobel Gases
The chemical Symbol for Gold is:
G
Go
Ag
Au
Which of the following elements is a metal?
Carbon
Sodium
Oxygen
Argon
What does a charge of +3 indicate?
There are 3 more neutrons than protons
There are 3 more protons than electrons
There are 5 electrons and 2 protons
There are 3 more electrons than protons
Who is credited with developing the Periodic Table of Elements?
Thomson
Rutherford
Mendeleev
Bohr
Which of the following is the correct Bohr Diagram for Mg, Magnesium?
Which element has an atomic number of 5?
Chlorine
Boron
Sodium
Neon
How many protons does Argon have?
14
16
18
20
What is the mass number of Chlorine?
11
24
35
67
How many neutrons are in the average atom of Calcium, Ca?
10
16
20
4
How many Electrons are present in a NEUTRAL atom of Nitrogen?
6
14
7
8
How many electrons are present in Cl -1?
17
18
35
16
How many electrons are present in Be+2?
4
2
6
9
How many OXYGEN atoms are present in the following molecule, (H2SO4)2 ?
(a)
How many HYDROGEN atoms are present in the following molecule, 3HCl2
(a)
Classify the following as a physical or chemical change: Paint Drying
Physical
Chemical
Classify the following as a physical or chemical change: Magnesium Ribbon Burns
Physical
Chemical
Classify the following as a physical or chemical change: A Puddle Evaporates on a Hot day
Physical
Chemical
What is the Mass Number of Carbon - 14?
12
6
14
16
How many Neutrons are in Oxygen - 18
8
10
18
16
