What type of reaction is combustion?

A chemical reaction with oxygen producing heat and light

The smallest unit of an element that retains its properties

Two or more atoms bonded together

What is the law of conservation of mass?

Mass cannot be created or destroyed in a chemical reaction

Why do chemical equations need to be balanced?

To follow the law of conservation of mass

What is a molecular compound?

A compound made of nonmetals sharing electrons

What is the atomic number of an element?

The number of protons in its nucleus

What are the three ways to name an ionic compound?

Simple ionic, transition metals, and polyatomic ions

What happens during a physical change?

The substance changes form but not chemical identity

What is the main difference between metals and nonmetals?

Metals conduct electricity; nonmetals usually do not

What is special about HOFBrINCl?

The only elements that always form diatomic molecules

An atom or molecule with an electric charge

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Chemistry Unit Review

30 termsStudBud Administration4 plays

Test your knowledge on basic concepts of chemistry including elements, molecules, bonds, and the periodic table.

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Questions 30

Answers

1
Which element is a noble gas?
Sodium
Neon
Oxygen
Chlorine
2
Which of these is a polyatomic ion?
Chloride (Cl⁻)
Sulfate (SO₄²⁻)
Sodium (Na⁺)
Helium (He)
3
What is the symbol for potassium?
L
K
S
P
4
What Types of Elements are Found on the "Staircase" of the Periodic Table?
Halogens
Metalloids
Metals
Non-Metals
5
What type of reaction is combustion?
A process that breaks atoms into particles
A chemical reaction with oxygen producing heat and light
A physical change involving melting
A reaction that absorbs light only
6
What is an Atom?
A compound made of ions
A type of molecule made of two elements
The smallest unit of an element that retains its properties
A charged particle only found in metals
7
What is the pH of a neutral substance?
10
0
14
7
8
What is a molecule?
A single proton
Two or more atoms bonded together
A type of isotope
A charged particle only found in metals
9
What type of reaction is: 2H₂ + O₂ → 2H₂O?
Decomposition
Synthesis
Combustion
Single Displacement
10
What is the law of conservation of mass?
Mass cannot be created or destroyed in a chemical reaction
Mass changes depending on temperature only
Mass increases after a reaction
Mass disappears when chemicals react
11
Why do chemical equations need to be balanced?
To reduce the number of molecules
To make equations easier to read
To show the charge of elements
To follow the law of conservation of mass
12
What is the correct name for CuCl₂?
Copper(III) chloride
Copper(II) chloride
Copper chloride
Copper(I) chloride
13
What is a molecular compound?
A compound made of metals and ions
A compound made of nonmetals sharing electrons
A compound held by magnetic forces
A mixture of different molecules
14
What is a diatomic molecule?
Three Atoms
Four or more Atoms
One Atom
Two Atoms
15
What is the atomic number of an element?
The total mass of the atom
The number of protons in its nucleus
The number of electrons plus neutrons
The total number of neutrons
16
What does the chemical formula H₂O represent?
Carbon dioxide
Hydrogen peroxide
Water
Oxygen gas
17
What are the three ways to name an ionic compound?
Binary acids, molecular ions, and complex salts
Covalent pairs, metallic bonds, and molecular radicals
Simple molecules, charged atoms, and acid radicals
Simple ionic, transition metals, and polyatomic ions
18
Which of the following is a base?
CO₂ (carbon dioxide)
HCl (hydrochloric acid)
NaOH (sodium hydroxide)
CH₄ (methane)
19
What is the name of the compound with the formula CO₂?
Carbon tetroxide
Carbon monoxide
Carbon trioxide
Carbon dioxide
20
What happens during a physical change?
Energy is destroyed
Atoms change into different elements and new substances form
New energy is created
The substance changes form but not chemical identity
21
What particle has a positive charge?
Proton
Photon
Electron
Neutron
22
Which state of matter has a definite volume but no definite shape?
Solid
Liquid
Gas
Plasma
23
What is the main difference between metals and nonmetals?
Metals are gases; nonmetals are solids
Metals conduct electricity; nonmetals usually do not
Metals only bond ionically; nonmetals only bond covalently
Metals have no protons; nonmetals have protons
24
What is the correct name for NaCl?
Sodium chlorate
Sodium Cholride
Sodium hydroxide
Sodium oxide
25
What is special about HOFBrINCl?
The only elements that can form tritomic molecules naturally
The only elements that always form diatomic molecules
The major non-metals
An acronym for the sections of the Periodic Table (ex. H - Halogen)
26
What is an Ion?
A neutral atom
An atom or molecule with an electric charge
A molecule that only exists in gases
A type of molecule made only of hydrogen
27
What is the charge on an electron?
Negative
Neutral
Positive
Depends on the atom
28
Which particle determines the identity of an element?
Electron
Photon
Neutron
Proton
29
What type of bond involves sharing electrons?
Covalent Bonds
Hydrogen Bonds
Ionic Bonds
Metallic Bonds
30
What does the periodic table organize elements by?
Atomic mass only
Increasing atomic number
Number of isotopes
Alphabetical order

Chemistry Unit Review Flashcards | StudBud