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WorksheetsGenChem
Total questions: 70
Worksheet time: 45mins
What is the study of matter and the changes it undergoes?
Physics
Chemistry
Biology
Astronomy
Which of the following is a pure substance?
Air
Saltwater
Oxygen
Coffee
What type of property depends on the amount of matter in a sample?
Intensive
Extensive
Chemical
Physical
Which of the following is an example of a chemical property?
Melting point
Density
Flammability
Boiling point
What is an example of a homogeneous mixture?
Oil and water
Orange juice with pulp
Salt dissolved in water
Sand and iron fillings
Which method is best for separating sand from water?
Filtration
Distillation
Evaporation
Chromatography
What is the SI unit of length?
Meter
Gram
Second
Mole
Who discovered the electron?
John Dalton
J.J. Thomson
Ernest Rutherford
Niels Bohr
What experiment led to the discovery of the nucleus?
Cathode Ray Tube Experiment
Gold Foil Experiment
Oil Drop Experiment
Plum Pudding Model
What is the charge of a neutron?
Positive
Negative
Neutral
Variable
Which subatomic particle determines the identity of an element?
Electron
Proton
Neutron
Nucleus
What is the mass number of an atom with 6 protons and 7 neutrons?
6
7
12
13
Isotopes of an element have different numbers of:
Protons
Electrons
Neutrons
Ions
What type of compound is CO₂?
Ionic
Covalent
Metallic
Organic
What is the name of the compound NaCl?
Sodium oxide
Sodium chloride
Sodium nitrate
Sodium carbonate
The mole is a unit for measuring:
Mass
Volume
Number of particles
Density
How many atoms are in one mole of a substance?
6.022 × 10²²
6.022 × 10²³
6.022 × 10²⁴
6.022 × 10²⁵
What is the molar mass of H₂O?
16.00 g/mol
18.02 g/mol
20.00 g/mol
24.02 g/mol
What is the percentage composition of oxygen in H₂O?
33.33%
44.44%
88.81%
66.67%
The empirical formula of C₆H₁₂O₆ is:
C₂H₄O₂
CH₂O
C₆H₁₂O₆
C₃H₆O₃
What is the SI unit for mass?
Gram (g)
Kilogram (kg)
Pound (lb)
Newton (N)
Who proposed the atomic theory stating that atoms are indivisible and cannot be created or destroyed?
J.J. Thomson
John Dalton
Ernest Rutherford
Niels Bohr
What do you call the total number of protons and neutrons in an atom?
Atomic number
Mass number
Atomic mass unit
Molar mass
Atoms of the same element that have different numbers of neutrons are called:
Ions
Isotopes
Compounds
Molecules
What type of compound is formed when a metal and a nonmetal combine?
Covalent compound
Ionic compound
Organic compound
Acid
What is the chemical formula for magnesium chloride?
MgCl
MgCl₂
Mg₂Cl
Mg₂Cl₂
What is the term for a charged atom?
Proton
Ion
Isotope
Molecule
What is Avogadro's number?
6.022 × 10²²
6.022 × 10²³
6.022 × 10²⁴
6.022 × 10²⁵
What is the empirical formula of glucose (C₆H₁₂O₆)?
CHO
CH₂O
C₆H₁₂O₆
C₃H₆O₃
What is the molar mass of NaCl?
22.99 g/mol
35.45 g/mol
58.44 g/mol
75.56 g/mol
The atomic number is equal to the number of neutrons in an atom.
True
False
A heterogeneous mixture has a uniform composition.
True
False
The SI unit for temperature is Kelvin.
True
False
The proton has a negative charge.
True
False
Filtration can separate dissolved salt from water.
True
False
The gold foil experiment led to the discovery of the neutron.
True
False
An isotope has the same number of protons but different numbers of neutrons.
True
False
The empirical formula represents the simplest whole-number ratio of atoms in a compound.
True
False
Covalent bonds involve the transfer of electrons.
True
False
The molar mass of NaCl is approximately 58.44 g/mol.
True
False
The atomic number of an element is the same as the number of electrons in a neutral atom.
True
False
All isotopes of an element have the same number of neutrons.
True
False
The SI unit for time is the second.
True
False
A mixture can be either homogeneous or heterogeneous.
True
False
The nucleus of an atom contains only electrons.
True
False
Distillation is used to separate liquids based on differences in boiling points.
True
False
Covalent compounds are formed by the transfer of electrons.
True
False
The empirical formula gives the exact number of atoms of each element in a compound.
True
False
Acids produce hydroxide ions (OH⁻) in solution.
True
False
The molecular formula of a compound is always a multiple of the empirical formula.
True
False
The negatively charged subatomic particle found in an atom.
(a)
The scientist who discovered the neutron.
(a)
The atomic model that describes electrons orbiting the nucleus in energy levels.
(a)
The ability of a substance to be hammered into thin sheets.
(a)
The SI unit for the amount of substance.
(a)
The scientist who conducted the Gold Foil Experiment.
(a)
The process used to separate pigments in ink.
(a)
The smallest particle of a covalent compound that retains its properties.
(a)
The chemical formula for carbon dioxide.
(a)
The number of neutrons in an atom of sodium-23.
(a)
The type of ion formed when an atom gains electrons.
(a)
The formula used to calculate percentage composition.
(a)
The number of atoms present in one molecule of glucose (C₆H₁₂O₆).
(a)
The atomic number of oxygen.
(a)
The chemical name of HCl in aqueous form.
(a)
The element with the atomic number 8.
(a)
The atomic mass unit is based on which element?
(a)
The simplest whole-number ratio of elements in a compound.
(a)
The scientist who proposed the plum pudding model of the atom.
(a)
The chemical formula for sulfuric acid.
(a)
