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babymother [125]
3 years ago
15

4. Did you know that the polar bear has black fur? Why does it look like it has white fur?

Chemistry
1 answer:
vova2212 [387]3 years ago
8 0
The polar bears skin is black but the outer color of its hair is clear to blend into its environment which is ice and snow
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9. How long will it take 120 grams of Strontium-90 to decay to 7.5 grams?<br>with steps pls​
ryzh [129]

Answer:

116 years

Explanation:

To solve this, we will use the half life equation;

A(t) = A_o(½)^(t/t_½)

Where;

A(t) is the amount of strontium left after t years;

A_o is the initial quantity of strontium that will undergo decay;

t_½ is the half-life of strontium

t is the time it will take to decay

We are given;

A(t) = 7.5 g

A_o = 120 g

From online values, half life of strontium-90 is 29 years. Thus, t_½ = 29

Thus;

7.5 = 120 × ½^(t/29)

Divide both sides by 120 to get;

7.5/120 = ½^(t/29)

0.0625 = ½^(t/29)

In 0.0625 = (t/29) In ½

-2.772589 = (t/29) × (-0.693147)

(t/29) = -2.772589/(-0.693147)

t/29 = 4

t = 29 × 4

t = 116 years

5 0
3 years ago
Which natural resource is nonrenewable?
insens350 [35]

Answer: The answer is D, Coal  

hope this helps.

6 0
3 years ago
How many valence electrons does alkali metals?
sergeinik [125]
Alkali Metals have 2 valence electrons
3 0
3 years ago
Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system,
defon

Answer:

C: The surroundings heat up and the system decreases in volume.

D: The surroundings heat up and the system does not change volume.

B: The surroundings heat up and the system expands in volume.

A: The surroundings get cold and the system decreases in volume.

Explanation:

The most exothermic reactions are those that release heat, that is to say, they give up the heat as it cools and the surroundings heat up.

As for endothermics, that is, those that absorb or capture the heat of the medium, they are variables that cool the environment that surrounds them and increase their internal temperature

5 0
3 years ago
56. When a person is not in touch with reality, they might have
amm1812
D: Schizophrenia. The individual that’s diagnoses with Schizophrenia tends to be disconnected with reality, leading to breakdowns in the world around them. A man sees a crowd of screaming, aggressive ghosts when it’s only a crowd of people waiting for a bus.
8 0
3 years ago
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