Chemistry Quiz: Isotopes and Atomic Mass

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What is the correct formula to calculate the relative atomic mass of an element with isotopes A, B, and C?

Relative atomic mass = (A% x Ma) + (B% x Mb) + (C% x Mc) (correct)

Relative atomic mass = (B% x Mb) + (C% x Ma) + (A% x Mc)

Relative atomic mass = (A% x Mb) + (B% x Mc) + (C% x Ma)

Relative atomic mass = (A% x Mc) + (B% x Ma) + (C% x Mb)

If the relative abundance of the isotopes of chlorine is 75% for $^{35}$Cl and 25% for $^{37}$Cl, what is the relative atomic mass of a chlorine atom?

34.5

36.5

35.5 (correct)

37.5

Which of the following isotopes has the highest relative abundance in chlorine isotopes described?

$^{37}$Cl

$^{35}$Cl (correct)

$^{34}$Cl

$^{39}$Cl

What relative atomic mass is given for bromine based on the isotopes $^{79}$Br and $^{81}$Br?

79.9 Signup and view all the answers

Which isotope mass corresponds to the known relative abundance of 25% for chlorine?

$^{37}$Cl Signup and view all the answers

What is the electronic arrangement of a sodium atom?

2, 8, 1 Signup and view all the answers

Which element has the electronic arrangement of 2, 8, 8?

Argon Signup and view all the answers

What is the definition of the octet rule?

Atoms' tendency to have eight electrons in the outer shell Signup and view all the answers

What characteristic greatly influences the chemical properties of an element?

The number of outermost shell electrons Signup and view all the answers

Which noble gas has an electronic arrangement of 2, 8, 18, 8?

Krypton Signup and view all the answers

What is the atomic number of an atom?

Number of protons in the atom Signup and view all the answers

Which term describes an electron configuration with 2 electrons in the outermost shell?

Duplet Signup and view all the answers

What is the mass number of an atom if it contains 6 protons and 8 neutrons?

14 Signup and view all the answers

Which of the following is a characteristic property of metals?

Good conductors of electricity and heat Signup and view all the answers

Which of the following best describes a semi-metal?

Has properties in between metals and non-metals Signup and view all the answers

What is an exception among metals regarding its state at room temperature?

Mercury Signup and view all the answers

Which of the following describes a property of non-metals?

Usually solid and dull in appearance Signup and view all the answers

Which non-metal is known for being an exception due to its physical properties?

Graphite Signup and view all the answers

Which of the following statements about sodium is true?

It floats on water Signup and view all the answers

What is a typical characteristic of non-metals when in solid form?

Brittle and not ductile Signup and view all the answers

What defines the physical state of most metals?

Solid with high melting points Signup and view all the answers

Which of the following is an accurate definition of a compound?

A material made of two or more elements chemically bonded. Signup and view all the answers

What is the definition of a pure substance?

A single type of material that cannot be broken down chemically. Signup and view all the answers

Which physical method can be used to separate a mixture of iron and sulfur?

Filtration Signup and view all the answers

Which statement best describes a mixture?

It is made of two or more different pure substances which are not chemically combined. Signup and view all the answers

Which of the following is NOT an example of a physical change?

Heating mercury oxide Signup and view all the answers

What occurs during the chemical change of mercury oxide?

It decomposes to yield mercury and oxygen gas. Signup and view all the answers

Which of the following substances can be categorized as an element?

Iron Signup and view all the answers

What are two examples of semi-metals?

Boron and Silicon Signup and view all the answers

How can distillation be classified?

It is a physical method for separating mixtures based on boiling points. Signup and view all the answers

Which statement correctly describes the conductivity of semi-metals?

Semi-metals conduct electricity when heated or slightly impure. Signup and view all the answers

What property do semi-metals generally have?

They are usually brittle and shiny solids. Signup and view all the answers

Which application utilizes the properties of silicon?

Making computer chips Signup and view all the answers

What is the definition of an atom?

The smallest part of an element that retains its chemical properties. Signup and view all the answers

What particles are contained within the nucleus of an atom?

Protons and neutrons Signup and view all the answers

Why is an atom considered electrically neutral?

The number of protons is equal to the number of electrons. Signup and view all the answers

Which is NOT recognized as a chemical element?

Water Signup and view all the answers