zinc crystals is made from zinc Oxide and which acid ​

Answer:

1750

Explanation:

Greenhouse gases are those gases that are believed to contribute to the rise in the temperature of the earth by trapping infrared rays close to the surface of the earth.

Prominent among the greenhouse gases are; N2O, methane and CO2.

From the chart, we can see that the lowest sum of concentration of greenhouse gases measured in ppm was obtained in 1750. Thus this period  shows the lowest composition of greenhouse gases.

Answer:

9.91 mL

Explanation:

Using the combined gas law equation as follows;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (torr)

P2 = final pressure (torr)

V1 = initial volume (mL)

V2 = final volume (mL)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

V1 = 15.0mL

V2 = ?

P1 = 760 torr

P2 = 1252 torr

T1 = 10°C = 10 + 273 = 283K

T2 = 35°C = 35 + 273 = 308K

Using P1V1/T1 = P2V2/T2

760 × 15/283 = 1252 × V2/308

11400/283 = 1252V2/308

Cross multiply

11400 × 308 = 283 × 1252V2

3511200 = 354316V2

V2 = 3511200 ÷ 354316

V2 = 9.91 mL

Answer:

64.6% of Br and 35.4% of Sr

Explanation:

The percentage composition is obtained defining the percentage in mass of each atom in a molecule.

To solve this question we must find the mass of each atom in 1 mole:

Molar mass Br: 79.904g/mol

Molar mass Sr: 87.62g/mol

The molar mass of SrBr2 is:

79.904g/mol*2 + 87.62g/mol =

159.808g/mol + 87.62g/mol =

247.428g/mol

The percentage of Br is:

79.904g/mol*2 = 159.808g/mol / 247.428g/mol * 100

= 64.6% of Br

And percentage of Sr is:

87.62g/mol / 247.428g/mol * 100

= 35.4% of Sr

Answer:

your answer is C I believe

Answer:

C

Explanation:

Answer:

a. 0.66 atm

Explanation:

Pi = 750 torr = 0.99 atm. Pf = ?

Vi = 400 ml Vf = 600ml

Using PiVi = PfVf

Then 400ml × 0.99atm = Pfatm × 600ml

Solving for Pf, we have,

Pf = (400ml × 0.99atm)/600ml

Pf = 0.66atm

Answer:

here is your answer

Cellulase and proteases are two enzymes are used for making alcohol

hope it helps you

Explanation:

pwlss giv meh brainless

Answer:

A

Explanation:

because it's positive

Answer:

b

Explanation:

Answer:

True

Explanation:

Asclepius known as the God of medicine, it is said to be healing in ancient Greek religion thag stands for thd healing aspect of the medical arts.

Medical encyclopedia is referred to as a general reference information that is used as sorting out medical related issues. It is a compilation of well written book or document that consists lf information that are related to diseases, medical cases, different tests, symptoms of the ailments, injuries, surgeries etc. and the documents have an a well broad photos of medicine-related photographs and others.

Answer:

T

Explanation:

Answer:

166.04g

Explanation:

Mass=Moles xRMM

1 mole = 6.023 x10^23molecules

5.0 x10^25molecules

=83.02moles

RMM=2

mass=83.02 x2

and=166.04g

Answer:

A molecular compound is usually composed of two or more nonmetal elements. Molecular compounds are named with the first element first and then the second element by using the stem of the element name plus the suffix -ide.

Answer:

Molarity of a solution where one mole of NaOH is added to 2000mL of water is 0.0005

Explanation:

Molarity is the equal to number of moles of solute divided by total volume of solvent

Given -

Number of moles of solute i.e  NaOH = 1

Total volume of solvent i.e water = 2000 mL

Molarity [tex]\frac{1}{2000} = 0.0005[/tex]

Answer:

It was the fifth radioactive element discovered, and is typically a colorless gas that puts off an insane glow when frozen.

Answer:

Protons are the positive parts in an atom, they are positively charged and they are located in the nucleus of an atom..

Explanation:

prolly not the best explanation but hope it helps <3

Answer:

its 4

Explanation:

Answer:

1.Most metal oxides are insoluble in water but some of these (e.g. Na2O.

Explanation:

2.: (i) A hissing sound is observed.

1.ii) The mixture starts boiling and lime water is obtained.

Answer:

3,3 Methyl hexyne

I hope it's helps you

Answer:

The energy changes in converting reactants to products is the same regardless of the route by which the chemical changes occur.

Answer:

(a) 0.294 mol silver = [tex]1.770 * 10^{23}[/tex]  

(b) 8.98 * 10-3 mol sodium chloride - [tex]5.407 *10^{23}[/tex]  

(c) 23.3 mol carbon dioxide  = [tex]1.403 * 10^{25}[/tex]

(d) 0.310 mol nitrogen (N2) = [tex]1.866 * 10^{23}[/tex]

Explanation:

In one mole there are [tex]6.022 * 10^{23}[/tex] atoms/molecules

(a) 0.294 mol silver = [tex]6.022 * 10^{23} * 0.294 = 1.770 * 10^{23}[/tex]  

(b) 8.98 * 10-3 mol sodium chloride - [tex]5.407 *10^{23}[/tex]  

(c) 23.3 mol carbon dioxide  = [tex]23.3 * 6.022 * 10^{23} = 1.403 * 10^{25}[/tex]

(d) 0.310 mol nitrogen (N2) = [tex]0.310 * 6.022 * 10^{23} = 1.866 * 10^{23}[/tex]

Answer:

straight line

Explanation:

Answer:

All K12 ppl say yeye

Explanation:

Answer:

CII + 4 e- → C-II   (reduction)

4 H0 - 4 e- → 4 HI   (oxidation)

Explanation:

Answer:

The correct answer should be:

[blank] CO + [2] H2  =>  [blank] CH3OH
or

CO + [2] H2  =>  CH3OH

Answer:

b. ph is greatet than 7

Explanation:

ph=7 neutral

ph=7-14 basicity as you go up increase basicity

ph=0-7 acodity as you go down increasing acidity

Answer:

a) 0.06 mol K₂(CO₃) and 0.07 mol Al(NO₃)₃

b) The limiting reactant is K₂CO₃

c) 0.03 moles of Al₂(CO₃)₃

Explanation:

The balanced reaction between K₂CO₃ and Al(NO₃)₃ is the following:

3 K₂CO₃ + 2 Al(NO₃)₃ → Al₂(CO₃)₃ + 6 KNO₃

(a) We can calculate the moles for each reactant as the product of the molarity (M) and the volume (V) in liters.

K₂(CO₃): M = 2.4 mol/L , V = 25 mL x 1 L/1000 mL = 0.025 L

⇒ moles K₂(CO₃) = M x V = 2.4 mol/L x 0.025 L = 0.06 mol K₂(CO₃)

Al(NO₃)₃: M = 2.0 mol/L , V = 35 mL x 1 L/1000 mL = 0.035 L

⇒ moles Al(NO₃)₃ = M x V = 2.0 mol/L x 0.035 L = 0.07 mol Al(NO₃)₃

(b) According to the balanced equation, the stoichiometric ratio is 3 moles K₂CO₃/2 moles Al(NO₃)₃. We have 0.07 moles of Al(NO₃)₃, so we multiply the moles of Al(NO₃)₃ by the stiochiometric ratio to calculate how many moles of K₂CO₃ are needed:

0.07 mol Al(NO₃)₃ x 3 mol K₂CO₃/2 mol Al(NO₃)₃ = 0.105 moles of K₂CO₃

We need 0.105 moles of K₂CO₃ but we have only 0.06 moles of K₂CO₃. Therefore, the limiting reactant is K₂CO₃.

(c) We use the limiting reactant to calculate how many moles of product (Al₂(CO₃)₃) are formed. According to the equation, 2 moles of K₂CO₃ produce 1 mol of Al₂(CO₃)₃, thus the stoichiometric ratio is 1 mol Al₂(CO₃)₃/2 moles K₂CO₃. We have 0.06 moles of K₂CO₃, so the number of moles of Al₂(CO₃)₃ will be:

0.06 moles K₂CO₃ x 1 mol Al₂(CO₃)₃/2 moles K₂CO₃ = 0.03 moles of Al₂(CO₃)₃

Answer:

1.40 M [OH⁻]

Explanation:

This compound dissociates into 3 ions, but since we are asked about [OH⁻], it's only 2. Therefore, multiply the molarity of the solution by the number of ions that [OH⁻] dissociates into:

2 × 0.70 M = 1.40 M

Hope this helps! Sorry that you got a link. Those are getting really annoying