Chemistry 121 Chapter 3 Part 1
Study for chemistry test
Questions and Answers
- 1.
An arrogation of two or more atoms held together by chemical means
- A.
Proton
- B.
Molecule
- C.
Atom
Correct Answer
B. MoleculeExplanation
A molecule is a group of two or more atoms that are held together by chemical means. It is formed when atoms share electrons or when they are connected by covalent bonds. This allows the atoms to form stable structures and behave as a single unit. The concept of a molecule is fundamental in understanding the properties and behavior of substances in chemistry.Rate this question:
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- 2.
All molecules carry a ________ charge
- A.
Neutral
- B.
Positive
- C.
Negative
Correct Answer
A. NeutralExplanation
Molecules are composed of atoms, which can have positive and negative charges. However, in a neutral molecule, the positive and negative charges cancel each other out, resulting in a net charge of zero. Therefore, all molecules carry a neutral charge.Rate this question:
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- 3.
Gives the relative number of atoms of each kind in the molecule is the simplest ratio.
- A.
Molecular Formula
- B.
Mass Number
- C.
Empirical Formula
Correct Answer
C. Empirical FormulaExplanation
The empirical formula gives the simplest ratio of atoms of each kind in a molecule. It represents the relative number of atoms present in the molecule. The molecular formula, on the other hand, gives the actual number of atoms of each element in a molecule. The mass number is the sum of protons and neutrons in an atom. Therefore, the correct answer is the empirical formula.Rate this question:
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- 4.
Describes the types of element making up he molecule and also the ratio of the elements.
- A.
Mass Number
- B.
Molecular Formula
- C.
Empirical Formula
Correct Answer
B. Molecular FormulaExplanation
The molecular formula describes the types of elements present in a molecule and also provides information about the ratio of these elements. It gives the actual number of atoms of each element in a molecule. The molecular formula is essential in determining the structure and composition of a compound, as it provides a clear representation of the elements and their arrangement within the molecule.Rate this question:
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- 5.
Write Isoprene = C6H8 as Empirical formulae.
- A.
CH2
- B.
C6H1
- C.
C2H3
Correct Answer
C. C2H3Explanation
The empirical formula represents the simplest ratio of atoms in a compound. In this case, the given molecular formula for isoprene (C6H8) can be simplified by dividing both the carbon and hydrogen atoms by their greatest common factor, which is 2. This results in the empirical formula C2H3, which represents the simplest ratio of carbon and hydrogen atoms in isoprene.Rate this question:
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- 6.
Write Benzene = C6H6 as Empirical formulae
- A.
CH
- B.
C3H3
- C.
C2H4
Correct Answer
A. CHExplanation
The empirical formula represents the simplest ratio of the atoms present in a compound. In the case of benzene (C6H6), the ratio of carbon to hydrogen is 1:1. Therefore, the empirical formula for benzene is CH.Rate this question:
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- 7.
Write Isoprene = C6H8 as Empirical formulae
- A.
C1H2
- B.
C3H6
- C.
C3H4
Correct Answer
C. C3H4Explanation
The empirical formula represents the simplest ratio of atoms in a compound. In this case, the empirical formula for isoprene (C6H8) is C3H4 because it represents the simplest ratio of carbon and hydrogen atoms in the compound. By dividing both the number of carbon and hydrogen atoms by 2, we get the simplest ratio of 3 carbon atoms to 4 hydrogen atoms.Rate this question:
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- 8.
Write Nitrogen dioxide = NO2 as Empirical formulae.
- A.
N2O2
- B.
N1O2
- C.
NO2
Correct Answer
C. NO2Explanation
The empirical formula of a compound represents the simplest whole number ratio of the elements present in the compound. In the case of nitrogen dioxide (NO2), the empirical formula is NO2. This means that for every one nitrogen atom, there are two oxygen atoms, giving a ratio of 1:2. The other options, N2O2 and N1O2, do not represent the correct ratio of elements in nitrogen dioxide, thus making NO2 the correct empirical formula.Rate this question:
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- 9.
What is the compound name for KF?
- A.
Fluoride Potassium
- B.
Potassium Fluoride
- C.
Potassium Flourine
Correct Answer
B. Potassium FluorideExplanation
The compound name for KF is Potassium Fluoride. In chemical compounds, the name of the metal comes first followed by the name of the non-metal with the suffix "-ide". In this case, K represents the metal potassium and F represents the non-metal fluorine. Therefore, the correct compound name is Potassium Fluoride.Rate this question:
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- 10.
What is the compound name for CaO?
- A.
Calcium Oxide
- B.
Calcium Oxygen
- C.
Carbon Oxygen
Correct Answer
A. Calcium OxideExplanation
Calcium Oxide is the correct answer because CaO is the chemical formula for Calcium Oxide. In this compound, Calcium (Ca) is combined with Oxygen (O) to form Calcium Oxide. The compound name is derived from the names of the elements present in it.Rate this question:
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- 11.
What is the compound name for LiI?
- A.
Lithium Iodine
- B.
Lithium Oxide
- C.
Iodine Oxide
Correct Answer
A. Lithium IodineExplanation
The correct answer is Lithium Iodine because Li represents the chemical symbol for lithium and I represents the chemical symbol for iodine. When these two elements combine, they form a compound called lithium iodine.Rate this question:
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- 12.
For Calcium bromine?
- A.
Ca-1Br3
- B.
CaBr2
- C.
Ca2Br
Correct Answer
B. CaBr2Explanation
Calcium bromine is represented by the chemical formula CaBr2. This indicates that it consists of one calcium atom (Ca) and two bromine atoms (Br). The subscript 2 next to Br indicates that there are two bromine atoms present in the compound. Therefore, the correct answer is CaBr2.Rate this question:
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- 13.
What is the correct formula of Ionic Compounds for Aluminum oxide?
- A.
Al2O3
- B.
AlO2
- C.
Al3O2
Correct Answer
A. Al2O3Explanation
The correct formula for aluminum oxide is Al2O3. This is because aluminum has a 3+ charge, while oxygen has a 2- charge. In order to balance the charges, two aluminum ions (3+) combine with three oxygen ions (2-) to form a neutral compound. Therefore, the formula Al2O3 represents the correct combination of aluminum and oxygen atoms in the ionic compound.Rate this question:
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Mar 20, 2023Quiz Edited by
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Sep 30, 2009Quiz Created by
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