A student mixes 20.0gof white KCl crystals with distilled water in a beaker. After the mixture was stirred, no crystals are visible and the solution is clear. After several days, all of the water evaporates and white crystals are found in the beaker. Which of following pieces of experimental evidence would best help the student to confirm that a new compound had not been made and that only a physical change occurred?
a- The solution does not change color after stirring.
b- The KCl crystals are no longer visible after mixing with water.
c- There is a temperature change in the solution during the dissolving process.
d- After the water has evaporated, the white crystals in the beaker have a mass of 20.0g

Answers

Answer 1

Answer:d

Explanation: over time water evaporates which leaves you with the white crystals mass

Answer 2

A student in a beaker mixes 20.0 g of white KCl crystals with distilled water; no crystals are visible, and the solution is clear, indicating that the physical change has occurred, which is that after the water has evaporated, the white crystals in the beaker have a mass of 20.0 g; that is option d.

What is the significance of the physical change?

The physical change includes the change in the shape and size of the substances but not the chemical change, as in the case of here the crystal, which is left behind after the evaporation of the solution without any change in the chemical composition.

Hence, a student in a beaker mixes 20.0 g of white KCl crystals with distilled water; no crystals are visible, and the solution is clear, indicating that the physical change has occurred, which is that after the water has evaporated, the white crystals in the beaker have a mass of 20.0 g; that is option d.

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Related Questions

If a number has the units g/L then its
A) a number we are not going to use at all.
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D) a relationship between volume and distance.

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Answer:

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g/L

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Answer:

(Physical or Chemical) properties of a substance can easily be observed. … (Physical or Chemical) properties can be used to identify substances. physical property. Oxygen is odorless and colorless.

Explanation:

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Answer:

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Answers

Answer:

In a pure metal, the force needed to make the layers slide over each other is small. This explains why many pure metals are soft. ... The smaller or bigger atoms distort the layers of atoms in the pure metal. This means that a greater force is required for the layers to slide over each other.

Explanation:

In a pure metal, the force needed to make the layers slide over each other is small. This explains why many pure metals are soft. ... The smaller or bigger atoms distort the layers of atoms in the pure metal.

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Answer:

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Elements are usually dull, brittle and do not conduct electricity are know as_____.

Points: 46

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Answer:

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31.) How far can a rock fly(meters). if the slingshot has a total potential of 500 Joules, and when releasing the slingshot exerts a total amount of 25 Newtons?​

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What color does red cabbage juice change in ammonia?

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Answer:

Green

Explanation:

Ammonia turns the cabbage juice into a blue/green color because it is a base, a material that tastes bitter and makes an acid neutral.

Answer:

green

Explanation:

I did the experiment

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Answers

Answer:

I think 1, 4, and 5 are the answers to this question. I am not sure about 4 though.

Explanation:

You have to have a power source (1), you also have to have a way to get that power somewhere else (5), and the reason for 4 would be that the power has to come back through the power source to remain working.

calculate the speed of a train that travels 540 km in 9 hours​

Answers

Answer:

s=d/t. d=540 t=9h

540÷90=6 km/h

What foods have been allowed or banned in which countries? Why?
please please help me

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kinder eggs were banned in the US for a while because of a 1938 federal law that banned toys to be enclosed within food products.
Marmite was banned in Denmark in 2004 because of a law that resourced food products that were fortified with vitamins. Marmite had yeast extract. Technically, Denmark hasn’t banned Marmite, it’s more the additional vitamins minerals and such.
Haggis was banned in the US dba sue it contained sheep lung, which violates federal safety regulations.
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Which of these substances is commonly refined by electrolysis?
brine
rust
titanium
water

Answers

I believe the answer would be titanium. Good luck on your assignment and have a happy christmas :)

10. 11. What is a crystal? ​

Answers

Answer:

there aren't any choices on the question so here's the closest i can give. A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure

Answer:

Definition of crystal :-

A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

Example of crystal :-

large crystals include snowflakes, diamonds, and table salt.

Meaning of crystal :-

.

A piece of a homogeneous solid substance having a natural geometrically regular form with symmetrically arranged plane faces. Ex:- "A quartz crystal".

Highly transparent glass with a high refractive index. ex :- "A crystal chandelier"

A force of 5N accelerates an object. The object mass is 50 g. What is the acceleration of an object?

Answers

Answer:

100 m/ s²

Explanation:

Newton's Second Law of Motion:

[tex] \boxed{ \mathsf{force = mass \times acceleration}}[/tex]

___________________

In the question:

Force applied = 5 N mass of the object experiencing force = 50 g

Note that the quantities here must be in their SI units.

SI unit of Force is Newton(N).

SI unit of mass is kilogram(kg)

Force is already in it's SI unit, while mass isn't.

Converting mass from grams to kilograms:

1000 g = 1 kg

=> 1 g = 1/ 1000 kg

=> 50 g = 50/ 1000 kg

= 1/ 20 kg

___________________

Calculating acceleration:

[tex] \mathsf{5 = \frac{1}{20} \times acceleration }[/tex]

multiplying both sides by 20:

[tex] \implies \mathsf{5 \times 20= (\frac{1}{20} \times 20)\times acceleration }[/tex]

20 on the RHS gets canceled, for it's present on the numerator as well as the denominator.

[tex] \implies \mathsf{100= acceleration }[/tex]

So, here, we got acceleration = 100 m/s².

Since, the other quantities used in the formula are in their SI units, acceleration must be in it's SI unit as well.

The SI unit of acceleration is m/s²

___________________

Answer:

[tex] \boxed{ \mathsf{100 \:m/s^2= acceleration }}[/tex]

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Answers

Answer:

3 is correct answer I think

Explanation:

Labor unions arose in the nineteenth century as increasing numbers of Americans took jobs in factories, mines, and mills in the growing industrial economy.

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D. Amplitudes

Answers

A spectrum is a  pattern is unique to a substance and can be used identify it.

According to Max Plank, energy occurs in packets called quanta. Hence, energy is not continuous but takes on discrete values which are integer multiples of a fundamental amount.

Again, when a substance is given light energy, a characteristic fingerprint is obtained. This pattern is unique to the substance that has it. These characteristics “fingerprints” are called spectrums.

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The number of protons and electron

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Answers

Answer:

Calcium

Explanation:

I just checked the periodic table! This is right checked twice, I hope this helped first time answering a question. Good luck!

Atoms with the same number of protons but with different electrical charges are called:

Answers

Answer:

It is called ions

Explanation:

Which chemical equation below shows a combination (or synthesis reaction?

A) 2KClO3 —> 2KCI+3O2
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D) NaCl —> Na + Cl

Answers

Answer is C

A synthesis reaction looks like this:

A+ B → AB

application of electroplating​

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Answer:

are you interested in tun

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Answer:

A. cycas

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2. it grow relatively slowly and have a large, terminal rosette of leaves.

B. bamboo

1. it is very durable

2. it is both flexible and elastic

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2. it are small, not exceeding 5 mm in length

D. paddy

1. it is variety purity

2. it degree of purity

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1. it is bear long sword-shaped leaves

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What does it mean to optimize a solution ?
How are solutions optimize

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Question

What does it mean to optimize a solution?

To find out best possible solution for a given problem within the given constraint is generally termed as optimization

How are solution optimize ?

To solve an optimization problem, begin by drawing a picture and introducing variables. Find an equation relating the variables. Find a function of one variable to describe the quantity that is to be minimized or maximized. Look for critical points to locate local extrema.

Based on the graph, what is the approximate half-life of the reaction shown below

Answers

Answer: 2.1 minutes

Explanation: Based on the graph, what is the approximate half-life of the reaction shown below

Which is the correct definition of electronegativity?

Answers

Answer:

Electronegativity is defined as the tendency of an atom participating in a covalent bond to attract the bonding electrons

Explanation:

Electronegativity increases and you go up and to the right, making fluorine the most electronegative element.

Question 24 of 25
How can one tell if a reaction is a redox reaction?
O A. Elements change phases.
O B. A precipitate is formed.
O C. Spectator ions are present.
O D. Electrons are gained and lost.

Answers

Answer:

D. Electrons are gained and lost

Explanation:

When electrons are gain and lost, redox reaction takes place. In redox reaction, reduction and oxidation tales place simultaneously. Therefore, option D is correct.

What is redox reaction ?

Redox reactions include a change in the oxidation state of the substrate. When electrons are lost or the oxidation state increases, it is called oxidation; when they are gained or the oxidation state decreases, it is called reduction.

Redox reactions are those in which there is a change in the oxidation number, with both an increase and a drop in number. The reaction called non-redox if this does not take place.

Oxidation and reduction always occur jointly because any loss of electrons by one substance must be followed by a gain of electrons by another. Therefore, oxidation-reduction processes or simply redox reactions are other names for electron-transfer events.

Thus, option D is correct.

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giving brainly if correct!
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Answer:

I hate chemistry good luck alice

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Answers

In case of a shortage in petroleum and natural gas, a company should find a way to make nylon without using natural resources.

Nylon is a very important material used in numerous applications. As a result of this, the demand for nylon as a raw material has genuinely been on the high side ever since.

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Answer:

identify a different natural resource that nylon could be made from

Explanation:

I just did this question

what is meant by the term symbol of an element?​

Answers

An element symbol is a one- or two-letter abbreviation for a chemical element name. When a symbol consists of two letters, the first letter is always capitalized, while the second letter is lowercase. Element symbols also can refer to alchemy symbols for the elements or to the symbols used to describe isotopes.

Study hard!

is the transfer of heat from one object to another by direct contact. Which materials conduct heat most easily?

Answers

Answer:

Conduction is the transfer of heat between substances that are in direct contact with each other. Explanation:The better the conductor, the more rapidly heat will be transferred. Metal is a good conduction of heat. Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more.

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