What types of reaction is Cu (s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)?

A. Single replacement

B. Double replacement

C. Synthesis

D. Decomposition

Answer Explanation:

This is a single replacement reaction in which copper replaces silver. The copper combines with the nitrate ions, and the silver precipitates out. Single replacement reactions have the general form of

A + BC →AC + B. Double replacement reactions have the general form of AB + CD→ AD + CB. Synthesis reactions have the general form of A + B →AB. Decomposition reactions have the general form AB→ A+B.

Therefore, the Correct Answer is A.

Q #1: Which of these body parts does NOT produce melanin?

A. Hair

B. Nails

C. Skin

D. Iris

Answer Explanation

While melanin can be found in nails, it is not produced there. Melanin is the pigment that provides color to skin, hair, and eyes. Although the specific coloring of one's skin, hair, and eyes are genetically determined. environmental factors such as sun exposure can increase melanin production in the skin to help protect it from damage.
Q #2: A chemistry experiment is performed to determine the effect of a nonvolatile solute on the boiling point of water. Three trials are performed in which 10 mg, 20 mg, and 30 mg of salt are added to 500 mL of distilled water. Each solution is heated on a hot plate, and the elevated boiling points are recorded. Determine the dependent and independent variables in this question.

A. The independent variable is the amount of salt, and the dependent variable is the temperature at which the water boils.

B. The independent variable is the amount of water, and the dependent variable is the temperature at which the water boils.

C. The independent variable is the temperature at which the water boils, and the dependent variable is the amount of salt.

D. The Independent variable is the amount of salt, and the dependent variable is the amount of water.

Answer Explanation

In a scientific experiment, the dependent variable is the condition that is being tested and measured. The independent variable is the condition that is being changed or controlled. In this example, the amount of salt is varied, and the boiling point of water is measured. Therefore, the independent variable is the amount of salt, and the dependent variable is the temperature at which the water bolls.
Q #3: Given that there are over 100 million residential addresses in the United States, which of the following best describes a flaw of this survey as it is described?

A. There were not enough age groups to show a trend based on age.

B. The addresses were chosen randomly rather than strategically

C. The distribution of ages in the sample did not reflect the actual population

D. Each response represents only one person per address

Answer Explanation

While the random selection and large number of surveys sent out were a good start, to truly study the relationship between age and screen usage, it would have been better to have a few more age groups or just a direct age value from each participant rather than four large categories. As far as whether the age distribution accurately reflected the population, we don't have enough information to say if that was a problem or not. Also, the fact that each response is from just one person at the address is not a flaw but a reasonable way to get a good variety of responses

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What types of reaction is Cu (s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)?

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Q #1: Which of these body parts does NOT produce melanin?

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Q #3: Given that there are over 100 million residential addresses in the United States, which of the following best describes a flaw of this survey as it is described?

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What types of reaction is Cu (s) + 2AgNO3(aq)&nbsp;&rarr;&nbsp;2Ag(s) + Cu(NO3)2(aq)?

More Questions on TEAS 7 Science

Q #1: Which of these body parts does NOT produce melanin?

Answer Explanation

Answer Explanation

Q #3: Given that there are over 100 million residential addresses in the United States, which of the following best describes a flaw of this survey as it is described?

Answer Explanation

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What types of reaction is Cu (s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)?