akmal123

Hydrofluoric acid, HF (aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the HF(aq). Sodium silicate Na2SiO3, for example, reacts as follows:

Na2SiO3(s) + 8 HF (aq) → H2SiF6(aq) + 2 NaF(aq) + 3 H2O(ɭ) 

(a) How many moles of HF are needed to react with 0.300 mol of Na2SiO3?

(b) How many grams of NaF form when 0.500 mol of HF reacts with excess Na2SiO3?

(c) How many grams of Na2SiO3 can react with 0.800 g of HF?

Roughly speaking, the radius of an atom is about  10,000 times greater than that of its nucleus. If an atom were magnified so that the radius of its nucleus  became 2.0 cm, about the size of a marble, what would  be the radius of the atom in miles? (1 mi 5 1609 m.)

A 35.0 mL sample of 1.00 M KBr and 65.0 mL sample of 0.600 M KBr are mixed.
What is the molarity of the KBr in the final solution?

Mass fraction of Na3PO4 solution is ω% = 5.0 % (density ρ=1.07 g/mL). Calculate the molarity (CM) of this solution!

Molarity of K2SO4 solution is 0.50 mol/L (density ρ=1.02 g/mL). Calculate the mass fraction (ω%) of this solution!

Is it possible to have more than 1 dictator? 

Imagine that you are a teacher in the primary grades (kindergarten – grade 2).  Your school switched to a curriculum that is heavy on direct academic instruction for the upcoming school year.

• Describe how you could ensure you incorporate play into the daily routine while still meeting instructional demands.

I was thinking the 2nd option, but maybe that is wrong? Please explain to me how I can see which one is correct.

Which salts will be more soluble in an acidic solution than in pure water?

Which of the following will be more soluble in an acidic solution than pure water?

Zn(OH)2

BaSO3

CsClO4

SrSO4

PbI2

I treid Zn(OH)2 and BaSO3 but that didnt work, even tried adding PbI2 to the list.

Please Help

Which of the following will be more soluble in an acidicsolution than in pure water? (Check all that apply)

Which of the following will be more soluble in an acidicsolution than in pure water? (Check all that apply)

CuCl

RbClO4

Zn(OH)2

AlPO4

SrSO4

I know that if we add H+ to the anion it will shift theequilibrium to the product side. But I am not sure how to determineif something is more soluble in acid than in water.

Which of the following will be more soluble in an acidic solutionthan in pure water?

Ni(OH)2

BaSO4

KClO4

AlPO4

CuCl

There can be multiple answers

Which of the following compounds are more soluble in acidicsolution than in pure water?: ZnS, BaSO4, AlPO4, Mg(OH)2

Which of the following compounds are more soluble in acidic solution than in pure water?

i) Mn(NO₃)₂ ii) BaSO₄ iii) Mg(OH)₂ iv) BaCO₃

Which of the following two compounds is expected to be more soluble in acidic solution than in pure water?

Al(NO3)3

AlPO4

Which of the following two compounds is expected to be more soluble in acidic solution than in pure water?

Mn(CN)2

Mn(NO3)2

Which of the following will be more soluble in an acidic solution than in pure water?

-CuCN

-PbSO4

-PbBr2

-Be(OH)2

-KClO4

Which of the following will be more soluble in an acidic solution than in pure water?

CuCN

Zu(OH)2

PbI2

CaSO4

KClO4

  Which of the compounds is more soluble in an acidic solution than in pure water? CuCN. KClO4, CuBr, Cd(OH)2, CaS.

What is the partial pressure of Ne in the flask (in bar)?

A flask contains a mixture of two gases: and Ne. If the flask contains 0.218 mol of and 13.8 g of Ne at a total pressure of 1.05 bar, what is the partial pressure of Ne in the flask (in bar?)

HELP PLEASE

Which of the following will be more soluble in an acidic solution than in pure water?

RbClO4, Cul, PbSO4,CuCN,Ni(OH)2

Which salts will be more soluble in an acidic solution than in pure water?

Ni(OH)2, AgBr, PbSO4, CuCN, CsCIO4

Which salts will be more soluble in an acidic solution than in pure water? PbSO4, CsClO4, Zn(OH)2, AgBr, CuCN

Which salts will be more soluble in an acidic solution than in pure water?

CuCN

PbSO₄

PbCl₂

Cd(OH)₂

KCLO₄

Which of the compounds is more soluble in an acidic solution than in pure water?

PbCl2

CsClO4

AlPO4

Sn(OH)2

CaS

Which of the compounds is more soluble in an acidic solution than in pure water? CuCN. KClO4, CuBr, Cd(OH)2, CaS. 

When elements combine to form compounds, the physical properties of the compound are the same as those of the elements. True or false? Explain your answer based on your observations.

Match numbers 1-4 

1. Linear DNA molecule

2. The S phase of the cell cycle

3. Replication starts binary fission

4. Elongation of the polynucleotide strand

What matches which number?

a) prokaryotic cell b) nucleus of eukaryotic cell c) mitochondrion d) replication