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3 years ago

Which waves can travel through empty space?

Chemistry

2 answers:

larisa86 [58]3 years ago

6 0

Mechanical waves
Mechanical waves are waves that can travel through matter or through empty space.

bagirrra123 [75]3 years ago

3 0

Answer:

light waves a

Explanation:

because there's all kinds of different light in space if you think about it like the bright stars or the bright moon it's kind of like light it just makes sense when it's traveling for space water waves obviously it's not possible that travels through the air or like on a beach sound waves you can't really cure much in space and mechanical waves is pretty much the action of an object or something like that kind of it's pretty much happens on Earth but light waves happen for like asteroids or shooting stars a comments it happens all the time for space so it makes just perfect sense

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When heating a chemical solution over an open flame in a test tube you should - A. keep a cork in the test tube so the solution

Alla [95]

Hello.

The answer is: A. keep a cork in the test tube so the solution cannot spill out

B and C both could be very deadly and it shouldnt be D because if u have an open flame you shouldnt open it even if its not towards anyone.

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3 years ago

9. Describe two ways in which you can conserve and recycle lab resources. I

Law Incorporation [45]

Answer:

Using solar energy, hydroelectric energy and wind are major ways of conserving natural resources. Trees and other organic energy sources are traditional sources of renewable energy. Forests can be replanted and hemp and other organic materials such as ethanol can be used to preserve natural resources.

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3 years ago

How would you balance this equation HCL+ Ba > BaCL2 + H2

vladimir2022 [97]

2 HCl + Ba(OH)2 = BaCl2 + 2 H2O is the answer.

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3 years ago

Read 2 more answers

What deos sedimentation mean

allsm [11]

Answer:

This is the tendency for particles in suspension to settle out of fluid in which they are contained and come to rest against a barrier.

Explanation:

In sedimentation, the particles are in a fluid and under the influence of forces , for example, gravitational forces, they settle and then come to rest when faced with a barrier.

The settling process is the process in which the particles fall out of liquid and sedimentation is the end of the process.

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3 years ago

If we have three different solutions, A, B, and C, each containing 100 g of water, plus respectively 6.84 g of sucrose (C12H22O1

GenaCL600 [577]

Answer:

c. A and C have the same boiling point, but B has a lower one.

Explanation:

The freezing point depression is expressed as:

ΔT = kf×m

Where kf is the freezing point depression constant that depends the nature of the solvent and m is molality (mol of solute/kg of solvent)

Boiling point elevation is:

ΔT = kb×m

Where kb is the ebulloscopic constant of the solvent.

As kf, kb and mass of solvent is the same for A, B and C solutions the only difference will be in moles of solute.

A 6,84g of sucrose are:

6,84g× $\frac{1mol}{342,3g}$ = 0,002 moles

B 0,72g of ethanol are:

0,72g× $\frac{1mol}{46,1g}$ = 0,0016 moles

C 0,40g of sodium hydroxide are:

0,40g× $\frac{1mol}{40g}$ = 0,001 moles

Using Van't Hoff factor that describes the number of moles in solution that comes from 1 mole of solute before dissolving, moles in solution for A, B and C are:

A. moles in solution: 0,02 moles×1 = 0,02 moles in solution

B. moles in solution: 0,016 moles×1 = 0,016 moles in solution

C. moles in solution: 0,01 moles×2 = 0,02 moles in solution

As A has the same moles in solution of C, the freezing point depression will be the same in A and C, and the lower freezing point depression will be in B.

Also, the boiling point will be higher in A and C, and then in B.

Thus:

a. C has the lowest freezing point in the group. FALSE. A and C have the lowest feezing point because have the higher freezing point depression.

b. A, B, and C all have different freezing points. FALSE. As moles of A and C are the same, freezing point will be the same for the solutions.

c. A and C have the same boiling point, but B has a lower one. TRUE.

d. The boiling point of C is lower than that of A or B . FALSE. Boiling point of C and A is higher than B.

e. A, B, and C will all have about the same freezing points. FALSE

7 0

3 years ago