Which of the following is a synthesis reaction?C2H4 + 3O2 yields 2CO2 + 2 H2O

2HCl yields H2 + Cl2

2K + 2HCl yields 2KCl + H2

SO3 + H2O yields H2SO4

Answers

Answer 1

Answer: SO3+H2O yields H2SO4 is the correct answer for your question, WELCOME:)

Answer 2

Answer: the last one is the answer to your question. D is the answer

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Which of the answer choices accurately describes a trend that occurs when moving left to right across periods?(Select all that apply.)

reactivity increases
atomic radius increases
atomic mass increases
valence electrons decrease

Answers

atomic radius is the correct answer

Water mixing with carbon dioxide from the air and changing the properties of limestone is an example ofa. chemical weathering.
b. erosion.
c. physical weathering.
d. rock weathering

Answers

It is an example of chemical weathering.
Because the carbon dioxide mixed with the air changes the chemical composition of limestone.

Hope it helps.

The correct answer is A. chemical weathering!

A is a heterogeneous mixture in which the particles settle to the bottom.

Answers

There are two types of mixture depending on the distribution of the components in the mixture. Homogeneous mixtures are mixtures which has uniform properties all throughout the solution while heterogeneous mixtures are the opposite they do not exhibit uniformity in any property. Example for a homogeneous is a salt solution where at any point you get a sample the properties are the same. For the heterogeneous mixture, a mixture of sand and salt where at any sampling point the properties are not the same.

suspension should be correct

a suspension

the particles are big enough to settle

a colloid

the particles are too small to ever settle

a solution

homogeneous mixture of two or more substances

A bottle of rubbing alcohol contains both 2-propanol and water. These liquids can be separated by the process of distillation because the2-propanol and water
(1) have combined chemically and retain their different boiling points
(2) have combined chemically and have the same boiling point
(3) have combined physically and retain their different boiling points
(4) have combined physically and have the same boiling point

Answers

Both 2-propanol and water can be separated by the process of distillation because the 2-propanol and water have combined physically and retain their different boiling points. Thus, the correct option for this question is C.

What is Distillation?

Distillation may be defined as a methodology through which components are separated from a mixture. It involves the process by which the components are evaporated and the vapors condensed.

2-propanol is also known as Isopropyl alcohol. The boiling point of this is 82.5°C which is lower than that of water. When both 2-propanol and water are mixed they usually get separated through the physical process known as boiling. Water typically starts boiling at 100°C.

Therefore, the correct option for this question is C.

To learn more about Boiling points, refer to the link:

brainly.com/question/40140

#SPJ2

The answer is (3). 2-propanol (also called isopropyl alcohol) and water are combined as a mixture, and it is therefore possible to separate them via the physical process of boiling since 2-propanol boils at a lower temperature than water does.

A gas contains a mixture of NH3(g) and N2H4(g), both of which react with O2(g) to form NO2(g) and H2O(g). The gaseous mixture (with an initial mass of 61.00 g) is reacted with 10.00 moles O2, and after the reaction is complete, 4.062 moles O2 remains. Calculate themass percent of N2H4(g) in the original gaseous mixture.

Answers

Answer:

Mass percent of N2H4 in original gaseous mixture = 31.13 %

Explanation:

Given:

Initial mass of gaseous mixture = 61.00 g

Initial mole of oxygen = 10.0 mol

Moles of oxygen remaining after the reaction = 4.062 mol

Moles of oxygen used = 10.0 - 4.062 = 5.938 mol

$4NH_3 + 7O_2\rightarrow 4NO_2 + 6H_2O$

$N_2H_4 + 3O_2\rightarrow 2NO_2 + 2H_2O$

Total oxygen used in both the reactions = 10.0 parts

out of 10 parts, 3 part react with N2H4.

$No.\;of\;moles\;of \;oxygen \;used = 5.398*(3)/(10) =1.78\; moles$

Now, consider the reaction of N2H4

$N_2H_4 + 3O_2\rightarrow 2NO_2 + 2H_2O$

3 moles of O2 react with 1 mole of N2H4

1.78 moles of oxygen will react with 1.78/3 = 0.5933 mol of N2H4

$Mass = Moles* Molecular mass$

Molecular mass of N2H4 = 32 g/mol

$Mass\;of\;N_2H_4= 0.5933* 32 = 18.99 g$

$Mass\;percent = (Mass\;of\;N_2H_4)/(Total\;mass)* 100$

Total mass = 61.0 g

$Mass\;percent = (18.99)/(61.0)* 100=31.13 \%$

Final answer:

The mass percent of N2H4 in the gaseous mixture can be determined through stoichiometric calculations and determining the limiting reactant. The initial and remaining amounts of O2 are used to calculate the reacted amount of O2, which then allows for the calculation of the amount of N2H4. This information is used in the mass percent formula.

Explanation:

The balanced reaction states that for one mole of NH3, one mole of O2 is required, while for one mole of N2H4, 3 moles of O2 are required. Thus, the initial moles of O2 were 10 moles and after reaction 4.062 moles O2 remained. Thus, the reacted amount of O2 is 10 - 4.062 = 5.938 moles. From calculating the limiting reactant and applying stoichiometry, the amount of N2H4 can be determined. We know the molar mass of N2H4 is 32 g/mole. By calculating the molar ratio, we can then calculate the mass percent of N2H4 in the mixture using the formula: (mass of N2H4 / total mass) * 100%.