Questions and Answers
Which of the following items is a mixture? (Select all that apply)
Which of the following is a homogeneous mixture? (Select one)
How would you classify sugar? (Select one)
Physical properties are: (Select one)
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What is the correct formula for a potassium ion with 18 electrons?
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An isotope represented as S-34: (Select one)
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A specific isotope of an element is known to have 15 protons and 16 neutrons. Which symbol would properly represent this isotope?
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An atom containing 7 protons, 8 neutrons, and 7 electrons: (Select one)
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Which of the following statements is FALSE? (Select one)
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All of the following can be considered physical properties EXCEPT: (Select one)
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Which of the following items is a physical property? (Select one)
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Which of the following elements has only 12 protons?
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Which one of the following is a main-group element?
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Isotopes are: (Select one)
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How many neutrons are present in C-14?
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When elements combine to form compounds: (Select one)
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How many oxygen atoms are in the formula Al2(CO3)3?
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Which among the following elements does NOT exist as a diatomic molecule in nature? (Select one)
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The ionic compound that forms between potassium and oxygen is: (Select one)
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What is the correct name of the compound whose formula is BF3?
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What is the name of HNO2?
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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.
