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dsp73
4 years ago
9

All of the following statements are correct except The conversion of compounds into elements is a chemical change. The conversio

n of sugar into carbon and water is a chemical change. The conversion of elements into compounds is a chemical change. The conversion of liquid water into gaseous water is a chemical change. The evaporation of water is a physical change.
Chemistry
1 answer:
aleksandrvk [35]4 years ago
6 0

Answer:

The conversion of liquid water into gaseous water is a chemical change

Explanation:

A chemical change occurs when there is a chemical reaction, so there'll be changed in the compounds, such as forming new ones, forming its elements, or elements forming compounds.

A physical change occurs when there is a change in the state of aggregation of the compound, it means that it changes its physical state. Solid for liquid, liquid for solid, liquid for gas, gas for liquid, solid for gas, and gas for solid are the physical changes.

So the evaporation of water, or its conversion in gaseous water, is a physical change, not a chemical change.

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How does the angle at which the sun's rays strike earth affect the number and types of organisms found in different areas of the
zlopas [31]
There's no math to this,
So I don't see why angle is in the question anyways...
The sun provides energy for animals and plants. A cave is a type of ecosystem that almost never sees the sunlight, and a forest is a type of ecosystem that sees the sunlight regularly. The difference between these two is- the caves have animals that have adapted to their environment, I think there's a species called ghost crabs that are blind and are white. This is because sunlight provides the vitamins to pigment skin. I could go on and on
5 0
3 years ago
At 46°C a sample of ammonia gas exerts a pressure of 5.3 atm. What is the pressure when the volume of the gas is reduced to one-
snow_lady [41]

Hello there!

As you may know, pressure and volume have an inverse relationship. This means that as pressure increases, volume decreases (and as volume increases, pressure decreases).

In this problem, the volume of the gas is reduced to 0.250 its original value. This means that the pressure should be higher than it was originally.

We can use Boyle's Law to solve this problem, seeing that temperature is kept constant.

P1V1 = P2V2

Let's rearrange this equation to isolate the variable we need, P2.

P1V1

-------   = P2

 V2

That's better! Now that we have that down, let's plug in the numbers we were given.

(5.3atm) * (V1)

-------------------- = P2

0.25(V1)

We can get rid of V1, as the number would be equal to 1 (anything divided by itself is equal to 1).

5.3atm

---------- = 21.2 atm

0.25L

Now, while the number is significantly higher, this is quite reasonable.

Let's plug it in and see if we get what we should:

5.3(V1) = (0.25V1)(21.2)

--------

0.25V1

21.2 atm = 21.2 atm

Seems right to me!

Feel free to comment if you need any more help. :)

5 0
3 years ago
What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?
asambeis [7]
D. A constant pressure calorimeter would be used because an increase in heat causes an increase in pressure.
6 0
3 years ago
Read 2 more answers
How many grams of LiOH are needed to make 25 mL of a 0.125 M solution?
MaRussiya [10]

Answer:

0.0734 grams LiOH

Explanation:

The molarity formula looks like this:

Molarity (M) = moles / volume (L)

You are given the molarity and volume (in mL). Therefore, you can plug these values into the equation and solve for moles (after you convert from mL to L).

25 mL / 1,000 = 0.025 L

0.125 M = moles / 0.025 L

(0.125 M) x (0.025 L) = moles

0.003125 = moles

After using the molarity formula, we know that 0.003125 moles LiOH are needed to satisfy these conditions. Now, we can convert this to grams using the molar mass of LiOH. This can be determined using the values from the periodic table. Remember to write your conversion in a way that allows for the units to cancel out.

Molar Mass (LiOH) = 6.941 g/mol + 16.00 g/mol + 1.008 g/mol

Molar Mass (LiOH) = 23.499 g/mol

0.003125 moles           23.499 g
------------------------   x   -------------------  =  0.0734 grams LiOH
                                        1 mole

6 0
2 years ago
What would be the product if dimethyl maleate was heated in the presence of 3-sulfolene?
prisoha [69]

An organic reaction between a substituted alkene and a conjugated diene to form a substituted cyclohexene derivative is said to be Diels-Alder reaction (specifically, [4+2 cycloaddition). The formation of new \sigma-bonds is the driving force of this reaction, which is energetically more stable than the \pi-bonds.

The reaction that takes place due to the heating of dimethyl maleate in presence of 3-sulfolene is as shown in the image.

On heating 3-sulfolene the compound breaks down to give sulfur dioxide gas and butadiene. This diene then reacts with dimethyl maleate which acts as a dienophiles and then these two diene and dienophiles will undergo a Diels-Alder reaction to form a new 6-membered cyclohexene ring.

Thus, the product formed due to the heating of dimethyl maleate in presence of 3-sulfolene is dimethyl cyclohex-4-ene-1,2-dicarboxylate.

7 0
3 years ago
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