At Sandra's clinic, the medications in a. to d. are used. Write the equality and two conversion factors, and identify the numbers as exact or give the number of significant figures for each:
b. The Daily Value (DV) for selenium is 70. mcg.

검증된 단계별 안내

Step 1: Write the equality based on the given information. The Daily Value (DV) for selenium is 70 mcg, which can be expressed as an equality:

1 DV = 70 mcg

Step 2: Create the first conversion factor using the equality. For example,

1 DV / 70 mcg

Step 3: Create the second conversion factor by inverting the first conversion factor. For example,

70 mcg / 1 DV

Step 4: Identify whether the number 70 is exact or has significant figures. Since the DV is a defined value, the number 70 is considered exact.

Step 5: Review the equality and conversion factors to ensure they are correctly formatted and can be used in calculations involving selenium dosage or DV comparisons.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Daily Value (DV)

The Daily Value (DV) is a reference value used on food labels to indicate how much a nutrient in a serving of food contributes to a daily diet. It helps consumers understand the nutritional content of food in the context of a total daily intake. For selenium, the DV is set at 70 micrograms (mcg), which serves as a guideline for adequate intake.

Significant Figures

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion. Understanding significant figures is crucial for accurately reporting measurements and calculations, especially in scientific contexts where precision is vital.

Conversion Factors

Conversion factors are ratios used to convert a quantity expressed in one unit to another unit. They are essential in calculations involving different measurement systems, ensuring that the values remain equivalent. For example, to convert micrograms to milligrams, one would use the conversion factor of 1 mg = 1000 mcg.

At Sandra's clinic, the medications in a. to d. are used. Write the equality and two conversion factors, and identify the numbers as exact or give the number of significant figures for each:b. The Daily Value (DV) for selenium is 70. mcg.