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zaharov [31]
3 years ago
13

Question 20 (Essay Worth 8 points)

Chemistry
2 answers:
sleet_krkn [62]3 years ago
8 0

Answer: The correct answer is c

Explanation: its is the right answer

KIM [24]3 years ago
4 0

Answer:

See explanation

Explanation:

FeCl3 +3 NaOH →3 NaCl + Fe(OH)3

One mole of ferric chloride reacts with three moles of sodium hydroxide to yield three moles of sodium chloride and one mole of ferric hydroxide. The reaction demonstrate the law of conservation of mass because the total mass of reactants equals the total masses of products formed.

b) neutralization reaction

c) lead is lower than zinc in the activity series of metals but calcium is higher than zinc hence zinc cannot displace calcium but it can displace lead.

d) the half life is 21 hours

e) it will take 320g grams 21 hours to remain 160g

It will take 160g 42 hours to remain 80g

It will take 80g 63 hours to remain 40g

It will take 40g 84 hours to remain 20g

It will take 20g 105 hours to remain 10g

It will take 10g 126 hours to remain 5g

It will take 5g 147 hours to remain 2.5g

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How were the Great Lakes formed?
cluponka [151]

Answer:

The Great Lakes were formed by a retreating glacier that dug out large basins. Then as the glacier melted, the water filled in those basins

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3 years ago
Which experiment lead to the discovery that the tiny, dense nucleus contained most of
oksian1 [2.3K]
I think it was from los griegos but a long time a go because he was making and experiment with and apple and he notice that he couldn’t cut more so he name it atoms (sorry for my bad English I don’t speak English)
7 0
3 years ago
If nitrogen-13 has a half life of 2.5 years, how much remains from a 100g sample after 7.5 years
Sonbull [250]

Answer:

12.50g

Explanation:

T½ = 2.5years

No = 100g

N = ?

Time (T) = 7.5 years

To solve this question, we'll have to find the disintegration constant λ first

T½ = In2 / λ

T½ = 0.693 / λ

λ = 0.693 / 2.5

λ = 0.2772

In(N/No) = -λt

N = No* e^-λt

N = 100 * e^-(0.2772*7.5)

N = 100*e^-2.079

N = 100 * 0.125

N = 12.50g

The sample remaining after 7.5 years is 12.50g

5 0
3 years ago
The physical world around us behaves as it does partly because it’s made of a huge number of tiny molecules, each behaving rando
eduard
1. Weird things like the one described above do not happen on a ramdom basis becuause molecules usually move within any enclosure in a ramdom manner. Thus, it is not possible for some types of particles to aggregate in one point while other types of molecule aggreagate in another point. Based on the kinetic energy that is available for each particle, each particle will move random
through the available space, colliding with one another and with the wall of container.

2. It will be a difficult thing to live in a Maxwell' demon world because, things will happen unpredictably and one will never know what to expect next because anything can happen at anytime. For instance, if one is drinking a glass of water, some of the particles of the water may just decide to aggregate to one part of the cup and start boiling. So, for someone who is taking a glass of water, the water may start boiling right inside his mouth when he is drinking, that will be a bad experience. When one is driving a car, the petrol particles may just decide to freeze up when one is busy speeding on the highway; that can cause a very serious accident. Thus, a world where the Maxwell law operates will be a chaotic world.
3 0
3 years ago
The mole fraction of nitrogen in the air is 0.7808. this means that 78.08% of the molecules in the air are nitrogen. when the at
Pachacha [2.7K]

Answer:

p = \boxed{\text{593 torr}}

Explanation:

For this question, we must use Dalton's Law of Partial Pressures:

The partial pressure of a gas in a mixture of gases equals its mole fraction times the total pressure:

p = \chi p_{\text{tot}}

Data:

χ = 0.7808

p_{\text{tot}} = \text{ 760 torr}

Calculation:

p = 0.7808 \times \text{ 760 torr}\\\\p= \boxed{\textbf{593 torr}}

7 0
3 years ago
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