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Natalija [7]
3 years ago
10

The public is not yet able to ourchase cars powered by hydrogen fuel cells because engineers have to determine how the cars perf

orm based on which scenario
Chemistry
1 answer:
disa [49]3 years ago
8 0

Answer:

in real-world conditions

Explanation:

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A scientist digs up sample of arctic ice that is 458,000 years old. He takes it to his lab and finds that it contains 1.675 gram
Fiesta28 [93]

Answer:

6.70 grams of krypton-81 was present when the ice first formed

Explanation:

Let use the below formula to find the amount of sample

N= N_0(\frac{1}{2})^n

where

n = \frac{t}{t_{\frac{1}{2}}}

here

t =  458,000 years

t_{\frac{1}{2}} = 229,000

\frac{t}{t_{\frac{1}{2}}} = \\frac{ 458,000}{229,000}

n = \frac{t}{t_{\frac{1}{2}}} = 2.000

Now substituting the values

1.675 = N_0(\frac{1}{2})^{2.000}}

1.675 = N_0\times (0.2500)

N_0= \frac{1.675}{0.2500}

N_0=6.70

3 0
3 years ago
3 Apply Many scientific words, such as matter, also have everyday meanings. Use context clues to write your own definition for e
rodikova [14]

Answer:

Explanation:

Use context clues to write your own definition for each meaning of the word matter.

Example sentence

What is this gooey matter on the table?

Matter:

__________

Example sentence

Please vote! Your opinions matter.

Matter:

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3 0
2 years ago
1. Which statement best describes why a gas is
Degger [83]

C) The molecules of a gas are much further

apart than those of a solid.

7 0
3 years ago
A thermometer is placed in water in order to measure the water’s temperature. What would cause the liquid in the thermometer to
dalvyx [7]

Answer : Option B) The molecules in the thermometer’s liquid spread apart.


Explanation : When a thermometer was placed in water to measure the water’s temperature. the molecules in the thermometer liquid which is often mercury spreads apart and rises, this shows a temperature increase in the thermometer.

3 0
3 years ago
Read 2 more answers
Hello! can a rock transform in to ANY type of rock? and why or why not
Oxana [17]

Answer:

yes it can

Explanation:

because, it depends on where the rock is, for example on a dessert it would Be cracked and things like that if near an eruption it would be the flamey black rock, and so on you get it

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3 years ago
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