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VLD [36.1K]
3 years ago
7

Scientists test their ideas about things they cannot observe directly by building

Chemistry
1 answer:
Karo-lina-s [1.5K]3 years ago
5 0

Answer:

yes

Explanation:

Testing scientific ideas

Testing Ideas. Testing hypotheses and theories is at the core of the process of science. ... match actual results observation, that lends support.

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What is one chemical reaction that begins with petroleum as a starting material
emmasim [6.3K]

Answer:

Thermal decomposition or cracking

Explanation:

Petroleum is a mixture of hydrocarbons which are usually formed naturally. Petroleum undergo a host of chemical reactions. One of such is thermal decomposition or cracking.

Cracking is used in the petroleum industry to covert heavy fractions to more useful lighter ones.

When petroleum is subjected to high temperature and pressure, and in the presence of catalyst, the long chain type of petroleum will decompose into more useful smaller and lighter molecules.

Example is given below:

                  C₁₅H₃₂ → C₈H₁₈ + C₃H₆ + 2C₂H₄

6 0
4 years ago
____KClO3 ---&gt; ____KCl+ _____O2<br><br> 2, 2, 3<br> 1, 3, 2<br> 2, 3, 3<br> 3, 2, 2
AVprozaik [17]

Answer:

2KClO3--------->2KCl + 3O2

3 0
3 years ago
4.0 L sample of methane gas is collected at 30.0c,<br> what is the volume of the sample at -8c?
Vedmedyk [2.9K]
This particular law is a gas law, called Charle's Law. The formula is:

V1    V2
---- = ----
T1     T2

So we know our original volume is 4.0L, so we would plug that into our V1. We know T1 is the 30 degrees, since it relates to our original volume. However, we need to convert it to kelvin. We do this simply by adding 273 degrees to the 30 degrees, since 273 is the constant for kelvin.

We do not know our second volume, however we know out T2. It is -8 degrees, and don't forget to convert it to Kelvin. 

So, when we plug all of these numbers into the equation, we are left with V2 to find. To do this we cross multiply (V1 x T2) and then divide by T1. That leaves us with the number for V2. Don't forget to round to the least # of sig figs! And you can divide V1 by T1, and then divide V2 by T2, to ensure your answers are the same, since they are directly porportional and need to be equal to each other. 

Hope I could help!
8 0
4 years ago
Convert 5,500 mg to kg. Show your work to receive full credit.
Ivanshal [37]
5500 mg = 0.0055 kg. is the answer
7 0
3 years ago
How does hydrogen peroxide bleach hair?
harkovskaia [24]

How does hydrogen peroxide bleach hair? THe h202 molecule sbreak the double bonds in pigment molecules


Question 3

What advantage does hydrogen peroxide have over other bleaching agents such as chlorine gas? Hydrogen peroxide decomposes into nontoxic water and oxygen.  

Question 4

How does hydrogen peroxide play a role in air pollution?Peroxide fragments react with unburned fuel creating eye irritants.

Question 5

In the reaction between melanin and hydrogen peroxide, which substance is oxidized (receives electrons)? melanin is oxidized,hydrogen peroxide is reduced


8 0
3 years ago
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