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Zigmanuir [339]
4 years ago
13

A rapidly falling object at a high altitude has _____

Chemistry
1 answer:
alisha [4.7K]4 years ago
7 0
A. high potential energy and zero kinetic energy.
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What is the molality of the solution?
castortr0y [4]

Answer:

6.6023g

Explanation:

To create a 0.247 M solution required weight of barium hydroxide.

0.247 x 171.346 =42.322g per liter

Therefore required mass for 156g of water = 42.322 x 0.156 = 6.6023g

7 0
3 years ago
Which group in the periodic table is known as the as the noble gases?
tekilochka [14]
ANSWER:

Group 18:
Elements are
-helium(He)
-neon (Ne)
-argon (Ar)
-krypton (Kr)
-xenon (Xe)
-radon (Rn)
-oganesson (Og)
6 0
3 years ago
After 15 minutes, 30 g of a sample of polonium-218 remain unchanged. If the original sample had a mass of 960 g, what is the hal
Keith_Richards [23]
Q1. The answer is 3 minutes.

Let's first calculate the remaining amount in percent:
If 960g is 100 percent (starting amount), 30 g is how many percents:
960 g : 100% = 30 g : x
x = 30 g * 100% / 960 g = 3.125% = 0.03125

Now, using the formula to calculate the number of half-lives:
(1/2)ⁿ = x,
where
x is the remaining amount: x = 0.03125
n is the number of half-lives
1/2 stands for half-life.

(1/2)ⁿ = 0.03125
⇒ n*log(1/2) = log(0.03125) 
    n = log(0.03125)/log(1/2) = log(0.03125)/log(0.5) = -1.505/-0.301 ≈ 5

The number of half-lives is 5.
Now, <span>the number of half-lives (n) is a quotient of total time elapsed (T) and length of half-life (L):
n = T/L
We know:
n = 5
T = 15 min
L = ?

Thus
L = T/n
L = 15 min/5 = 3 minutes

Q2. Filtration should be chosen.
Filtration and distillation are used to separate mixtures - filtration for the separation of heterogeneous mixtures and </span>distillation for the separation of homogeneous mixtures. Imagine that your pile of soil is a mixture. It consists of different components (the leaves, acorns, twigs), so it is the heterogeneous mixture. Therefore, to separate the leaves, acorns, twigs you will use filtration.
5 0
4 years ago
I am a beginner can someone give me a brainliest to start me out I would appreciate it.<br> :)
erastovalidia [21]

Answer:

same

Explanation:

6 0
3 years ago
Read 2 more answers
What two gases have a profound effect on the type of organisms that can live in an area and influences the regions carrying capa
Over [174]

Answer:

Oxygen and Carbon dioxide

Explanation:

Oxygen is required for respiration whereby energy is released from natural occurring nutrients accompanied by the release of water and carbon dioxide. carbon dioxideis also required by plants to photosynthesise.

Oxygen and carbon dioxide in the troposphere supports life as by enabling respiration in organisms and photosynthesise in plants can. Without oxygen in an environment, only life forms that live by anaerobic respiration will thrive. This affects a regions carrying capacity

3 0
3 years ago
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