CHEMISTRY HIGH SCHOOL

How many grams of hydrogen peroxide (H2O2) must be added to 1,500 mL of water to produce a concentration of 1.33 m (molal solution)? (Recall that the density of water is 1.0 gram/mL.)

Answers

Answer 1

Answer:

Given:

1,500 mL of water

1.33 m (molal solution

Required:

grams of hydrogen peroxide (H2O2

solution:

1.33 molal = 1.33 m = 1.33 moles H2O2/kg water

1 gram/liter of water (1 liter/1000 mL) (1500mL)(1 kg/1000g) = 0.0015 kg water

1.33 moles H2O2/kg water (0.0015 kg water) = 0.001995 moles H2O2

Molar mass of H2O2 = 34 g/mol

0.001995 moles H2O2 (34 g/mol) = 0.068 grams H2O2

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Of the elements Fe, Hg, U, Te, and Y, which is considered a Group A element?

Answers

Answer:

Te is considered a Group A element.

Explanation:

Fe, Hg and Y belong to Group B.

U is a transition element.

Te is the only element that belong to Group A.

I hope I've solved your doubt.

How many electrons would be found in an isotope of silicon 29

Answers

14 electrons15 neutrons

Answer: 14

Explanation: Founders Educere answer.

Good luck my fellow summer school students, I love you all.

Please rate, thanks, & vote brainliest, I want a rank up already.

Directions: Write the name of the type of chemical reaction in the space provided.(Can be Synthesis Reaction, Decomposition Reaction, Combustion, Single Displacement Reaction or Double Displacement Reaction)

Answers

The given reactions are combination reaction, decomposition reaction, neutralization reaction, displacement reaction and double displacement reaction.

What is displacement reaction?

A displacement reaction is a chemical process during which a one more reactive element being replaced from its compound by a less reactive element.

What is combination reaction?

When A combination reaction occurs when one or more elements or compounds react together to generate a new chemical. Equations of the following kind are used to depict such reactions.

X+ Y→XY

6) $Fe}(s)+3{O}_(2)(g)$ → $2{Fe}_(2) {O}_(3)(s)$ , this reaction is a kind of combination reaction reaction.

7) ${Zn}_(2)(s)+2 {HCl} (aq)$ → ${ZnCl}_(2)(a q)+{H}_(2)(g)$

This reaction is a kind of displacement reaction.

8) ${MgCO}_(3)(a q)+2 {HCl}(a q)$ → ${MgCl}_(2)(a q)+{H}_(2) {O}(l)+{CO}_(2)(g)$ .

This reaction is a kind of combustion reaction.

9) ${NiCl}_(2)(s)$ → ${Ni}(s)+{Cl}_(2)(g)$ .

This reaction is a kind of decomposition reaction.

10) ${C}(s)+6 {H}_(2)(g)+{O}_(2)(g)$ → $2 C}_(2) {H}_(6) {O}(s)$ .

This reaction is a kind of combination reaction.

11) $\mathrm{C}_(12) \mathrm{H}_(22) \mathrm{O}_(11)(s) \rightarrow 12 \mathrm{C}(s)+11 \mathrm{H}_(2) \mathrm{O}(\mathrm{g})$ .

This reaction is a kind of dissociation reaction.

12) $2 \mathrm{LiI}(a q)+\mathrm{Pb}\left(\mathrm{NO}_(3)\right)_(2)(a q) \rightarrow 2 \mathrm{LiNO}_(3)(a q)+\mathrm{PbI}_(2)(s)$ .

This reaction is a kind of double displacement reaction.

13) $\mathrm{CdCO}_(3)(s) \rightarrow \mathrm{CdO}(s)+\mathrm{CO}_(2)(g)$ .

This reaction is a kind of decomposition reaction

14) $\mathrm{Cl}_(2)(g)+2 \mathrm{KBr}(a q) \rightarrow 2 \mathrm{KCl}(a q)+\mathrm{Br}_(2)(g)$ .

This reaction is a kind of single displacement reaction.

15) $\mathrm{BaCl}_(2)(a q)+2 \mathrm{KIO}_(3)(a q) \rightarrow \mathrm{Ba}\left(\mathrm{IO}_(3)\right)_(2)(s)+2 \mathrm{KCl}(a q)$ .

This reaction is kind of double displacement reaction.

16) $2 \mathrm{Mg}(s)+\mathrm{O} 2(\mathrm{~g}) \rightarrow 2 \mathrm{MgO}(s)$ .

This reaction is a kind of combination reaction.

17) $AgNO_(3) (aq) +KI(aq)$ → $KI(aq) + KNO_(3)(aq)$ .

This reaction is a kind of double displacement reaction.

18) $2 \mathrm{Li}(s)+\mathrm{H}_(2) \mathrm{O}(b) \rightarrow 2 \mathrm{LiOH}(a q)+\mathrm{H}_(2)(g)$ .

This reaction is a kind of single displacement reaction.

19) $\mathrm{C}(\mathrm{s})+\mathrm{O}_(2)(\mathrm{~g}) \rightarrow \mathrm{CO}_(2)(\mathrm{~g})$ .

This reaction is a kind of combination reaction.

To know more about displacement reaction click here.

brainly.com/question/3172917.

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combination reaction,decombinationreaction,displacementreaction,decombinatioreaction,neutrilizatioreaction

During transmutation the number of (protons, neutrons) always (increases,decreases).

Answers

During transmutation the number of protons always increases.

How to calculate molar mass

Answers

Molar masses of chemical compounds are equal to the sums of the molar masses of all the atoms in one molecule of that compound. After that, If you have a subscript in a chemical formula, then you multiply the number of atoms of anything next to that subscript by the number of the subscript. I'm kinda new to this stuff. Hopefully I helped :/

Molar mass is the sum of all atomic masses in a given compound in relative grams. To explain how to calculate the Molar mass, let me show you an example.

Calculate the Molar mass of H2O

now, atomic mass of H - 1
Atomic mass of O - 16

Now, molar mass = 1(2) + 16

= 2 +16
= 18 u = 18 grams (relative mass in grams)

The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 g/mol. How many moles of I2 will form 3.58 g of NI3?

Answers

The balanced chemical reaction is:

N2 +3 I2 = 2NI3

We are given the amount of product formed. This will be the starting point of our calculations.

3.58 g NI3 ( 1 mol NI3 / 394.71 g NI3 ) ( 3 mol I2 / 2 mol NI3 ) = 0.014 mol I2.

Thus, 0.014 mol of I2 is needed to form the given amount of NI3.

Answer:

Answer is 0.0136.

Explanation:

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