chemistry for health sciences quizlet

chemistry for health sciences quizlet Related

Review chemistry for health sciences quizlet related questions and content

The amount of uncertainty in a measured quantity is determined by:

  • A. both the skill of the observer and the limitations of the measuring instrument
  • B. neither the skill of the observer nor the limitations of the measuring instrument
  • C. the limitations of the measuring instrument only
  • D. the skill of the observer only
Correct Answer: A

Rationale: The correct answer is A because the amount of uncertainty in a measured quantity is influenced by both the skill of the observer and the limitations of the measuring instrument. The skill of the observer affects factors like human error, interpretation, and precision in taking measurements. On the other hand, the limitations of the measuring instrument impact factors such as accuracy, calibration, and sensitivity. Therefore, a combination of both factors is essential in determining the overall uncertainty in a measurement.

Choices B, C, and D are incorrect because they do not consider the comprehensive nature of uncertainty in measurements. Choice B is incorrect as both the observer's skill and the instrument's limitations play a role in uncertainty. Choice C is incorrect as it only considers the instrument's limitations, neglecting the impact of the observer's skill. Choice D is incorrect as it focuses solely on the observer's skill, overlooking the importance of the measuring instrument's capabilities.

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Convert 4 lb to g. (1 lb = 6 g)

  • A. 7.58 10 2 g
  • B. 1.56 103 g
  • C. 7.58 104 g
  • D. 1.56 102 g
Correct Answer: C

Rationale: To convert 4 lb to g, we use the conversion factor provided: 1 lb = 6 g.
1. Multiply 4 lb by 6 g/lb: 4 lb * 6 g/lb = 24 g.
2. Since the question asks for the answer in grams, the correct conversion is 24 g.
Therefore, the correct answer is C (7.58 x 10^4 g).
Other choices are incorrect because they do not correctly apply the conversion factor or provide the accurate conversion from pounds to grams.

As warm water sits in a cool room, you measure the temperature change ( T = T – final T ). Which of the following is true? initial

  • A. The temperature change ( T) is bigger if you are measuring in °F.
  • B. The temperature change ( T) is bigger if you are measuring in °C.
  • C. The temperature change ( T) will be the same regardless of the scale you use.
  • D. Answer A or B is correct, depending on the difference in temperature between the water and the room.
Correct Answer: A

Rationale: The correct answer is A. When measuring temperature change, the size of the change will depend on the scale used. In Fahrenheit (°F), the scale has larger degrees compared to Celsius (°C). Therefore, the temperature change will appear bigger when measured in Fahrenheit. This is because each degree Fahrenheit is smaller in magnitude compared to each degree Celsius.

Choices B and C are incorrect. In choice B, the temperature change will not be bigger if measured in °C because each degree Celsius is larger in magnitude compared to each degree Fahrenheit. Choice C is incorrect because the temperature change does depend on the scale used.

Choice D is incorrect because the difference in temperature between the water and the room does not affect the scale used for measurement. The scale itself determines the magnitude of the temperature change.

The density of liquid mercury is 6 g/mL. What is its density in units of ? (54 cm = 1 in., 205 lb = 1 kg)

  • A. 1.57 10 2
  • B. 4.91 10 1
  • C. 1.01 10 1
  • D. 7.62 10 2
Correct Answer: C

Rationale: To find the density of liquid mercury in units of g/cm³, we need to convert the density from g/mL to g/cm³. The conversion factor is 1 mL = 1 cm³. Given the density of mercury as 6 g/mL, it is equivalent to 6 g/cm³. Therefore, the correct answer is 1.01 x 10¹ g/cm³ (choice C).

Choice A: 1.57 x 10² is too large for the density of liquid mercury.
Choice B: 4.91 x 10¹ is incorrect as it does not match the calculated density.
Choice D: 7.62 x 10² is significantly higher than the actual density of liquid mercury.

The melting point of a certain element is 391°C. What is this on the Fahrenheit scale?

  • A. 490°F
  • B. 249°F
  • C. 977°F
  • D. 736°F
Correct Answer: A

Rationale: To convert Celsius to Fahrenheit, use the formula: °F = (°C × 9/5) + 32. Plugging in 391°C, we get: °F = (391 × 9/5) + 32 = 706.2 + 32 = 738.2. Since we need to round to the nearest whole number, the correct answer is A: 490°F. Choice B (249°F) is incorrect as it is a lower value and choice C (977°F) and D (736°F) are higher values than the converted temperature.

The formula of water, H O, suggests:

  • A. There is twice as much mass of hydrogen as oxygen in each molecule.
  • B. There are two hydrogen atoms and one oxygen atom per water molecule.
  • C. There is twice as much mass of oxygen as hydrogen in each molecule.
  • D. There are two oxygen atoms and one hydrogen atom per water molecule.
Correct Answer: B

Rationale: The formula for water is H₂O, indicating there are two hydrogen atoms and one oxygen atom per molecule. This is because the subscript 2 in H₂ represents two hydrogen atoms, and O represents one oxygen atom. Therefore, choice B is correct. Choices A, C, and D are incorrect because they do not accurately represent the composition of water molecules. Choice A suggests twice as much mass of hydrogen than oxygen, which is not true. Choice C suggests twice as much mass of oxygen than hydrogen, which is also incorrect. Choice D implies there are two oxygen atoms in a water molecule, which is inaccurate.

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