Substances made of two or more different atoms bonded together

In a neutral atom, how are the number of protons and electrons related?

The number of protons and electrons are always the same.

What is a mixture in chemistry?

A combination of two or more substances that are not chemically bonded.

What information about atoms does the periodic table provide?

The atomic number, atomic mass, and element symbol.

Groups of two or more atoms chemically bonded together

Burning wood to produce ash and smoke is an example of a chemical change.

Burning wood results in the formation of new substances

Crushing a solid piece of metal into a thin sheet is an example of a physical change.

The metal's shape changes, but its chemical composition remains the same.

What are the number of protons, neutrons, and electrons in the element Uranium (U)?

Protons: 92, Neutrons: 146, Electrons: 92

What are the rules for the arrangement of electrons in the electronic structure of an atom?

The first shell holds 2 electrons, the second and third holds 8 electrons

Which of the following is an example of a double replacement reaction?

AgNO₃ + NaCl → AgCl + NaNO₃

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Atoms and Reactions Y8A

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Questions 18

Answers

1
Look at the periodic table. Is the electron configuration for Calcium (Ca) correct?
True
False
2
What are compounds?
Substances made of two or more different atoms bonded together
Substances made of only one type of atom.
Substances that only exist as liquids.
Substances that cannot be broken down.
3
In a neutral atom, how are the number of protons and electrons related?
The number of electrons is always greater than the number of protons
The number of protons and electrons are never the same.
The number of protons and electrons are always the same.
The number of protons is always twice the number of electrons.
4
What is an atom?
A subatomic particle found only in the nucleus of stars
A tiny molecule that makes up all plants and animals
The smallest unit of matter
The most important molecule
5
What is a mixture in chemistry?
A chemical compound formed by a chemical reaction
A substance that can only exist in liquid form
A substance made of only one type of atom
A combination of two or more substances that are not chemically bonded.
6
What information about atoms does the periodic table provide?
The number of protons, neutrons, and electrons in all atoms.
The atomic number, electron configuration, and element name.
The color, size, and temperature of atoms.
The atomic number, atomic mass, and element symbol.
7
What are molecules?
Tiny particles that only exist in gases
Single atoms that cannot bond
Atoms that have lost or gained electrons
Groups of two or more atoms chemically bonded together
8
Which of the following is an example of a single replacement reaction?
Zn + 2HCl → ZnCl₂ + H₂
Na₂CO₃ + CaCl₂ → CaCO₃ + 2NaCl
2H₂ + O₂ → 2H₂O
2KClO₃ → 2KCl + 3O₂
9
Burning wood to produce ash and smoke is an example of a chemical change.
Burning wood results in the formation of new substances
Burning wood only changes its temperature
Burning wood is a physical change
The wood only changes in appearance, not chemically
10
Crushing a solid piece of metal into a thin sheet is an example of a physical change.
Crushing the metal changes its chemical properties
The metal is completely transformed into a new substance
The metal undergoes a chemical reaction.
The metal's shape changes, but its chemical composition remains the same.
11
Which of the following is an example of a decomposition reaction?
Zn + HCl → ZnCl₂ + H₂
2KClO₃ → 2KCl + 3O₂
2H₂ + O₂ → 2H₂O
Na₂CO₃ + CaCl₂ → CaCO₃ + 2NaCl
12
Diatomic elements are elements that naturally exist as molecules made of two different atoms
False
True
13
An atom has NO charge?
False
True
14
What are the number of protons, neutrons, and electrons in the element Uranium (U)?
Protons: 92, Neutrons: 140, Electrons: 94
Protons: 92, Neutrons: 146, Electrons: 92
Protons: 94, Neutrons: 150, Electrons: 94
Protons: 90, Neutrons: 144, Electrons: 90
15
Which of the following is an example of a synthesis reaction?
Cl₂ + 2NaBr → 2NaCl + Br₂
2H₂ + O₂ → 2H₂O
NaCl → Na + Cl₂
H₂O → H₂ + O₂
16
Which of the following is the largest planet in our solar system?
Saturn
Jupiter
Earth
Mars
17
What are the rules for the arrangement of electrons in the electronic structure of an atom?
Electrons fill the highest energy level first before lower levels.
Electrons can occupy any orbital without considering their energy levels.
The first shell holds 2 electrons, the second and third holds 8 electrons
Electrons fill orbitals randomly and without any specific order
18
Which of the following is an example of a double replacement reaction?
H₂O → H₂ + O₂
2Na + Cl₂ → 2NaCl
AgNO₃ + NaCl → AgCl + NaNO₃
Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

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