When propane is reacted in the presence of oxygen gas, the products of this combustion reaction are:
Your Answer: Option(s)
Correct Answer: Option(s) D
Rationale
When propane undergoes combustion in the presence of oxygen, it forms carbon dioxide (CO2) and water (H2O). The balanced chemical equation for this reaction is: C3H8 + 5O2 -> 3CO2 + 4H2O. This means that three molecules of carbon dioxide and four molecules of water are produced when one molecule of propane reacts with five molecules of oxygen. Therefore, option D (CO2 + H2O) is the correct answer.
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Question 2
Which type of reaction is exemplified by the chemical equation KClO₃ → KCl + O₂?
Your Answer: Option(s)
Correct Answer: Option(s) D
Rationale
The chemical equation KClO₃ → KCl + O₂ represents a decomposition reaction. In a decomposition reaction, a single compound breaks down into two or more simpler substances. In this case, potassium chlorate (KClO₃) decomposes into potassium chloride (KCl) and oxygen gas (O₂). Therefore, the correct answer is D: Decomposition. This reaction is not a single replacement reaction (where one element replaces another in a compound), a double replacement reaction (where ions in two compounds exchange places), or a combustion reaction (which involves a substance reacting with oxygen to produce heat and light).
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Question 3
The chemical equation Cr + Fe(NO₃)₂ → Fe + Cr(NO₃)₂ is an example of which type of reaction?
Your Answer: Option(s)
Correct Answer: Option(s) A
Rationale
The correct answer is A: Single replacement. In this reaction, chromium (Cr) replaces iron (Fe) in the compound Fe(NO₃)₂, resulting in the formation of Fe and Cr(NO₃)₂. Single replacement reactions involve an element and a compound, where the element replaces another element in the compound. The general form of a single replacement reaction is A + BC → AC + B, where A is an element and BC is a compound. This type of reaction is also known as a displacement reaction, where a more reactive element displaces a less reactive element in a compound.
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Question 4
What is the density of a piece of cork with a volume of 23.5 cm³ and a mass of 5.7g?
Your Answer: Option(s)
Correct Answer: Option(s) A
Rationale
Density is calculated by dividing the mass of an object by its volume. In this case, the density of the cork can be calculated by dividing 5.7g by 23.5 cm³, resulting in a density of approximately 0.243g/cm³. Therefore, choice A, 0.243g/cm³, is the correct answer as it accurately represents the density of the cork based on the provided values.
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Question 5
What is the mass of ethyl alcohol that will exactly fill a 200.0 mL container?
Your Answer: Option(s)
Correct Answer: Option(s) A
Rationale
To determine the mass of ethyl alcohol required to fill a 200.0 mL container, we apply the formula Mass = Volume x Density. Given that the volume is 200.0 mL and the density of ethyl alcohol is 0.789 g/mL, the calculation becomes Mass = 200.0 mL x 0.789 g/mL = 157.8 g. Therefore, the correct answer is A, 157.8 g, as this is the mass of ethyl alcohol needed to completely occupy the 200.0 mL container.
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