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3 years ago

Which substance can not be broken down by a chemical change? silicon propane ethane water

Chemistry

2 answers:

babunello [35]3 years ago

5 0

I think the answer is silicon :))

navik [9.2K]3 years ago

5 0

Answer:

$\huge \boxed{\mathrm{silicon}}$

Explanation:

Silicon cannot be broken down by any physical or chemical methods, because it is an element. It has properties of an element nor a compound or mixture.

Silicon is a chemical element with the symbol Si and atomic number 14.

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What do we call the stars whose properties follow the patterns?

muminat

Answer:

It is called Asterism.

Explanation:

It is Asterism because Asterism refers to a pattern of stars that are seen in night sky and are very distinctive and identifiable. These group of starts have patterns. It visually seen collection of stars and it's indicate their properties and the lines that connect the stars together. It actually range from small shapes of stars to more complex stars that cover segment of the sky. The stars may be bright naked or have similar brightness.

4 0

3 years ago

In the following reaction, eight moles of sodium hydroxide is broken down into four moles of sodium oxide and four moles of wate

maxonik [38]

Answer:

21.344%

Explanation:

For the given chemical reaction, 8 moles of the reactant should produce 4 moles of $Na_{2}O$ . However, 195 g of $Na_{2}O$ was produced instead. The molar mass of $Na_{2}O$ is 61.9789 g/mol.

Thus, the moles of $Na_{2}O$ produced = 195/61.9789 = 3.1462 moles

The percent error = [(Actual -Experiment)/Actual]*100%

The percent error = [(4.00 - 3.1462)/4.00]*100% = (0.85376/4.00)*100% = 21.344%

8 0

4 years ago

A professor stevens wants to mix a solution (a mixture of substance and water) containing 13% acid with one containing 18% acid

Arte-miy333 [17]

Answer:

20 ml 13% solution should the professor use

Explanation:

Let

the volume of the 13% solution should the professor use = a

So, according to question

13% x a + 18% x (50-a) = 50 x 16%

⇒ 0.13 a + 0.18 x 50 - 0.18 a = 50 x 0.16

⇒ - 0.05 a = 8 - 9

⇒ $a=\frac{-1}{-0.05} = 20ml$

So, 20 milliliters of the 13% solution should be the professor used.

& (50 - 20) = 30 ml of the 18 % solution would be use.

6 0

4 years ago

Which of the following is the energy of motion?

Nataliya [291]

i hope this helps u : )

5 0

3 years ago

Read 2 more answers

The following is a chemical reaction for _______ with ozone.

Naily [24]

unreactive gaseous compounds of carbon with halogens, that is used in fire extinguishers, and is very harmful for ozone layer are called as halons .
So according to above explanantion,
b. halons, is the correct answer.

3 0

3 years ago

Read 2 more answers