Chemistry Chapter 3 Flashcards

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Questions and Answers

Which of the following items is a mixture? (Select all that apply)

Water

None of the above

Sugar

Helium

Brass (correct)

Which of the following is a homogeneous mixture? (Select one)

Molten iron

Stainless steel (correct)

Trail mix

None of the above

Water

How would you classify sugar? (Select one)

Pure substance - element

None of the above

Mixture - homogeneous

Mixture - heterogeneous

Pure substance - compound (correct)

Physical properties are: (Select one)

Those that a substance displays without changing its composition. Signup and view all the answers

What is the correct formula for a potassium ion with 18 electrons?

K+ Signup and view all the answers

An isotope represented as S-34: (Select one)

Contains exactly 18 neutrons. Signup and view all the answers

A specific isotope of an element is known to have 15 protons and 16 neutrons. Which symbol would properly represent this isotope?

P Signup and view all the answers

An atom containing 7 protons, 8 neutrons, and 7 electrons: (Select one)

Is charge-neutral. Signup and view all the answers

Which of the following statements is FALSE? (Select one)

All of the above statements are true. Signup and view all the answers

All of the following can be considered physical properties EXCEPT: (Select one)

Flammability. Signup and view all the answers

Which of the following items is a physical property? (Select one)

The odor of spearmint gum Signup and view all the answers

Which of the following elements has only 12 protons?

Mg Signup and view all the answers

Which one of the following is a main-group element?

Cs Signup and view all the answers

Isotopes are: (Select one)

Atoms of the same element that have different number of neutrons. Signup and view all the answers

How many neutrons are present in C-14?

8 Signup and view all the answers

When elements combine to form compounds: (Select one)

Their properties change completely. Signup and view all the answers

How many oxygen atoms are in the formula Al2(CO3)3?

9 Signup and view all the answers

Which among the following elements does NOT exist as a diatomic molecule in nature? (Select one)

Neon Signup and view all the answers

The ionic compound that forms between potassium and oxygen is: (Select one)

K2O. Signup and view all the answers

What is the correct name of the compound whose formula is BF3?

Boron trifluoride Signup and view all the answers

What is the name of HNO2?

Nitrous acid Signup and view all the answers

Study Notes

Mixtures and Pure Substances

Brass is classified as a mixture, specifically an alloy.
Stainless steel is a homogeneous mixture composed of iron and carbon.
Sugar is identified as a pure substance and categorized as a compound.

Physical Properties and Ions

Physical properties are traits exhibited by a substance without altering its chemical composition.
A potassium ion with 18 electrons is denoted as K+.
Isotopes, such as S-34, contain varying numbers of neutrons; S-34 has 18 neutrons.
The isotope with 15 protons and 16 neutrons is represented as P (Phosphorus).
An atom with 7 protons, 8 neutrons, and 7 electrons possesses no overall charge, making it neutral.

Statements about Matter

A pure substance can either be an element or a compound, and all statements about variations in substances are deemed true.
Flammability is not classified as a physical property, unlike taste, density, boiling point, and color.
The odor of spearmint gum exemplifies a physical property.

Elements and Main-Group Classification

Magnesium (Mg) is defined by having 12 protons.
Cesium (Cs) is a notable main-group element among the options provided.
Isotopes consist of atoms that differ in neutron count while maintaining the same element identity.

Neutrons and Compounds

Carbon-14 (C-14) contains 8 neutrons.
When elements form compounds, their intrinsic properties are transformed.
The chemical formula Al2(CO3)3 comprises 9 oxygen atoms.

Diatomic Molecules and Ionic Compounds

Neon is the sole element listed that does not exist as a diatomic molecule in nature.
The ionic compound resulting from the interaction between potassium and oxygen is K2O.
Boron trifluoride is the correct name for the compound with the chemical formula BF3.
Nitrous acid corresponds to the chemical formula HNO2.

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Description

Test your knowledge with these flashcards covering mixtures and pure substances from Chapter 3 of Chemistry. Learn to identify homogeneous mixtures and classify different items correctly. Perfect for reinforcing your understanding of key concepts in chemistry.