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3 years ago

9

Suppose you have 50 grams of a radioactive isotope with a half-life of 2 years. How much of the isotope will you have after 4 ye

ars?
A. 50
B. 25
C. 12.5

2 answers:

Mandarinka [93]3 years ago

7 0

The answer would be C.

lys-0071 [83]3 years ago

5 0

C would be the best answer

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Why might a major volcanic eruption lead to cooler temperatures of Earth's surface?

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When a volcano erupts it releases a large amount of dust, smog, rock, and other materials. Basically, these bits and pieces float to form a metaphorical dust cloud. These clouds can often block out the sun like an ordinary cloud; however, because the cloud is dark, even less sun will be able to get through. So because the sun can't reach the ground, the temperature might decrease.

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What does the law of conservation of matter/mass state

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Which of the following statements about the brain is true? a. The skull could support as much as 3 tons of weight. b. The brain

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Answer:

a. The skull could support as much as 3 tons of weight.

Explanation:

The true statement about brain is

a. The skull could support as much as 3 tons of weight.

The cranium(skull) bones are slot like a jigsaw puzzle together. All but one of these bones is fixed in place in adults. It makes the skull very solid. Babies have holes between the cranial (skull) bones so that as they are born, their heads may withstand being crushed.

rest all statements are wrong.

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3 years ago

What is the mass in grams of 2.25 mol of the element iron, Fe?

scZoUnD [109]

<h3>Answer:</h3>

126 g Fe

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

2.25 mol Fe

<u>Step 2: Identify Conversions</u>

Molar Mass of Fe - 55.85 g/mol

<u>Step 3: Convert</u>

Set up: $\displaystyle 2.25 \ mol \ Fe(\frac{55.85 \ g \ Fe}{1 \ mol \ Fe})$
Multiply: $\displaystyle 125.663 \ g \ Fe$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

125.663 g Fe ≈ 126 g Fe

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PH3
Also known as phosphine

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