How many grams of KNO3 would recrystallize from 100 g of water, if a saturated solution were cooled from 50 degrees celcius to 20 degrees celcius?

Answers

Answer 1

Answer:

Answer:

$m_(cryst)=58g$

Explanation:

Hello there!

In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.

In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:

$m_(cryst)=88g-30g\n\nm_(cryst)=58g$

Best regards!

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The cheetah has been clocked at 112 km/Hr. What speed would this be in ft/sec?

a man bought two watches for Rs 2500 each.He sold one of them at 10% . profit and the other at 4% loss.what was his gain or loss percent on the whol

Answers

Answer:

Selling price of watch A and watch B= Rs. 425

Let cost price of watch A=x

Profit =10%

∴

100

110

x=425

x=386.36

Let cost price of watch B=y

Loss =10%

∴

100

y=425

y=472.22

Net cost price =x+y=858.5858

Net selling price =850

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858.58

858.5858−850

×100=1%

Explanation:

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If you make an electromagnet using a battery circuit and a steel nail, how can you increase its magnetic strength? A. replace the nail with a copper rod B. wrap more coils of wire around the nail C. use a longer nail D. remove the plastic insulation from the wire coil

Answers

Answer: The correct answer is "wrap more coils of wire around the nail".

Explanation:

Electromagnet: When the current passes through iron core wounded by the coils then it will get magnetized. It is not a permanent magnet.

It will loose its magnetism when the current does not flow in it.

The poles of the electromagnet can be changed. They are not fixed.

In the electromagnet, the strength of the magnetism can be increased or decreased by increasing the number of turns in the coil and by increasing the current.

In the given problem, If you make an electromagnet using a battery circuit and a steel nail, the magnetic strength can be increased by wrapping more coils of wire around the nails.

Therefore, the correct option is (B).

we can increase the strength of an electromagnet by wrapping more coils of wire around the nail.

An element's atomic number is 63. How many protons would an atom of this element have?

Answers

Atomic number of an element correlates to the number of protons an atom of that element will have. An atom of this element would have 63 protons.

Scientists use critical thinking skills throughout the process of research or experimentation. A student notices that their energy level always seems to decrease when they drink soda, but they seem to have more energy when they don’t drink soda. The student decides to conduct an experiment to determine if their soda intake really does have an effect on their energy level. What critical thinking step has the student just completed in the situation described above?a.
Asking a question
b.
Evaluating a promotional claim
c.
Adjusting a conclusion
d.
Determining a logical conclusion

Answers

Answer : Option A) Asking a question.

Explanation :

The step that the student just completed in the situation given above is asking a question.

As the student noticed that consumption of soda deceases their energy level, he asked the question to this why does this happens? this was the first step of using critical thinking skills to ask a question first analyze it and then perform and witness some experimental observations and come out with the conclusion.

But in this given example he just completed the first step of asking question. Therefore, the answer is asking a question which is option A.

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The scientific method is carried out in several stages:

1. Observation,

2. Determine the problem

2. Data, collect information

3. Hypothesis

4. Experiments

5. Analysis

6. Conclusion

7. Compilation of laws or theories

In the context of the problem, students will experiment to study the effect of

So students issue a question which is why can affect their energy, Thus students have made the first 2 steps in the scientific method :

1. Observation of and the human's energy level,

2. Determine the problem that will be the basis of student research, namely the influence of the human's energy level.

Indirectly this student has obtained 2 variables to be examined, namely variable and human energy level, which can be changed according to conditions, which are chosen as fixed variables and which ones are independent variables.

So that the next step is collecting data and so on can be done immediately

If we look at other answer choices :

B. Evaluating a promotional claim

This stage is done after the results of the research have been obtained so that students can submit an evaluation of their learning outcomes

C. Adjusting a conclusion

This stage will be obtained after students have completed the analysis of the experimental data

So the most appropriate answer is A.Asking a question

$\boxed{\boxed{\bold{Learn~more}}}$

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Keywords: scientific method, fixed variable, independent variable, asking a question, human energy level

Describe and explain the trends in reactivity in different groups of the periodic table, using your knowledge of electronic structure. [6 mark]

Answers

Metal period- Reactivity Gets smaller as you move from left to right.
Group- Reactivity gets bigger as you move down a group.

Identify what a bomb calorimeter measures. Identify what a bomb calorimeter measures. measures ΔE for aqueous reactions measures ΔH for oxidation solutions measures ΔH for hydrolysis solutions measures ΔT for hydrolysis solutions measures ΔE for combustion reactions

Answers

Answer: Option (e) is the correct answer.

Explanation:

A device which consists of a sealed metal container and it is immersed in an insulated sealed container which is filled with water used to calculate heat of combustion of a reaction.

Volume remains constant in a bomb calorimeter. Basically, a bomb calorimeter measures the changes occurring in the internal energy because of a chemical reaction.

Thus, we can conclude that a bomb calorimeter measures $\Delta E$ for combustion reactions.

A bomb calorimeter measures ΔE for combustion reactions. Thus, option E is correct.

A device which consists of a sealed metal container and it is immersed in an insulated sealed container which is filled with water used to calculate heat of combustion of a reaction.

Volume remains constant in a bomb calorimeter. Basically, a bomb calorimeter measures the changes occurring in the internal energy because of a chemical reaction.

Thus, we can conclude that a bomb calorimeter measures for combustion reactions.

Learn more about reaction on:

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The options are

measures ΔE for aqueous reactions

measures ΔH for oxidation solutions

measures ΔH for hydrolysis solutions

measures ΔT for hydrolysis solutions

measures ΔE for combustion reactions

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