CHEMISTRY HIGH SCHOOL

When 50.0 g of silicon dioxide is heated with an excess of carbon, 32.2 g of silicon carbide is produced. SiO2 (s) + 3 C (s) → SiC (s) + 2 CO (g) What is the percent yield of this reaction?grams of hydrogen gas will be produced?

Answers

Answer 1
Answer:

Answer:

0.97g

Explanation:
Answer 2
Answer:

Answer:

0.97g

Explanation:

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How many significant figures are in the measurement 0.020 km?
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If a compound has a molar mass of 180 g/mol and its empirical formula is CH2O, what is its molecular formula? CH2O C2H4O2 C6H12O6 C12H22O11

Answers

Its molecular formula : C₆H₁₂O₆

Further explanation  

The empirical formula(EF) is the smallest comparison of atoms of compound forming elements.  

A molecular formula(MF) is a formula that shows the number of atomic elements that make up a compound.  

(EF) n = MF

its empirical formula is CH₂O

CH₂O : 12+2+16=30

\tt [30]n=180\rightarrow n=6\n\n(CH_2O]_6=C_6H_(12)O_6

Answer:

C. C6H12O6

Explanation:

For edge(:

How is the number of valence electrons related to the ionization energy of an element?A) low ionization energy correlates to elements with fewer valence electrons
B) elements with higher ionization energy tend to have less valence electrons
C) atoms with nearly full valence electrons shells have lowers ionization energy
D) high ionization energy indicated a low likelihood to gain valence electrons

Answers

The number of valence electrons is related to the ionization energy of an element such that when there is few valence electrons, the ionization energy of an element is lower. The trend on the periodic table follows that the ionization energy fairly increases as the number of valence electron increases. Therefore the correct answer is letter "A."

Scientific notation for 5,098,000

Answers

When you do not see the decimal just put it at the very end of the problem! 
So now 5,098,000.
Now we need to move the decimal over to make this problem greater than 1 and less than 10. So if we but the decimal Right after 5 we have 5.098 which is greater than 1 and less than 10.
So now we write it out like this
5.098*10^x
let's find x.
X is how many times we moved the decmal over, in this case 6.So now
5.098*10^6
Does this help?
5.098*10^6    , this is the correct answer
                                                         

In which type of chemical reaction do two or more substances combine to form one substance? A) synthesis
B) decomposition
C) single replacement
D) double replacement

Answers

The reaction in which two or more substances combine to form one substance is called a synthesis reaction, Option A is the correct answer.

What do you understand by a synthesis reaction ?

The reaction in which two or more molecules combine to form one or more different molecule is called a synthesis reaction.

These are also called as Combination Reaction.

Example Synthesis reaction of Ammonia from Hydrogen and Nitrogen , known as Haber's Process.

3H₂ + N₂-----> 2NH₃

This reaction takes place at high temperature and pressure.

Therefore , The reaction in which two or more substances combine to form one substance is called a synthesis reaction, Option A is the correct answer.

To know more about Synthesis Reaction

brainly.com/question/24936069

#SPJ2
a) synthesis reaction

Scientific Notation expresses a value as the product of a number between 1 and 10 and

Answers

... and a power ot ten.

For example: 1,3x10^21 is in scientific notation, but 13x10^20 is not in scientific notation.

Which one of the following statements about absolute zero is correct? (a) At absolute zero, the volume of an ideal gas is zero.
(b) At absolute zero, ideal gases freeze to give solids.
(c) At absolute zero, solid and liquid water are at equilibrium.
(d) Absolute zero is the lowest temperature so far reached in the laboratory

Answers

The statement labeled as (a) is the correct one on that list.
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