All categories

3 years ago

Can some one please help?

Chemistry

1 answer:

Lady bird [3.3K]3 years ago

4 0

Answer:

2HNO3 + Ba(OH)2 = Ba(NO3)2 + 2H2O

H3PO4 + Ca(OH)2 = Ca3(PO4)2 + 6H2O

3HCl + Fe(OH)3) = FeCl3 + 3H2O

Explanation:

H+

N3-

O2-

Ba2+

OH-

P 5+, 3+, 3-

Ca2+

Cl-

Fe 2+, 3+

2HNO3 + Ba(OH)2 = Ba(NO3)2 + 2H2O

H3PO4 + Ca(OH)2 = Ca3(PO4)2 + 6H2O

3HCl + Fe(OH)3) = FeCl3 + 3H2O

You might be interested in

This one is actually 30 points chem quesitons

GuDViN [60]

Answer:

The answers to your questions are below:

Explanation:

Question 31 Silicon and sulphur, because they are in the same period (3)

Question 34 the third option, density is not in the table

Question 37 group 1A alkali metals

Question 38 group 1A, oxygen group

Question 39 They are metalloids

5 0

3 years ago

Imagine that A and B are cations and X, Y, and Z are anions, and that the following reactions occur: AX(aq)+BY(aq)→no precipitat

aleksley [76]

Answer:

b. AZ BX

Explanation:

A⁺, B⁺, X⁻, Y⁻ and Z⁻

AX(aq)+BY(aq)→no precipitate

AX(aq)+BZ(aq)→precipitate.

AX(aq)+BY(aq)→no precipitate:

A⁺ (aq) + X⁻ (aq) + B⁺ (aq) + Y⁻ (aq) → AY (aq) + BX (aq)

AX(aq)+BZ(aq)→precipitate:

A⁺ (aq) + X⁻ (aq) + B⁺ (aq) + Z⁻ (aq) → AZ (s) + BX (aq)

Considering the reactions above, the insoluble specie is AZ.

3 0

3 years ago

Read 2 more answers

16. Formaldhyde has a mole ratio of 1 mole C: 2 moles H: 1 mole O. Its empirical formula is the same as its

Dominik [7]

Answer:

d. 97.60 g

Explanation:

Given parameters:

Number of moles of formaldehyde = 3.25moles

Ratio:

C H O

1 2 1

Unknown:

Mass of this sample = ?

Solution:

The empirical formula of a compound is its simplest formula. It is the simplest whole number ratio of the atoms in a given substance.

The molecular formula is the actual formula of the compound.

Since the molecular and empirical formula are the same here, the formula of the compound is;

CH₂O

To find the mass of the formaldehyde, use the expression below;

Mass = number of moles x molar mass

molar mass of CH₂O = 12 + 2(1) + 16 = 30g/mol

Mass = 3.25 x 30 = 97.5g

6 0

3 years ago

For an electron in an atom to change from ground state to an excited state,

barxatty [35]

It must absorb energy in the form of for example heat which gives it the energy required to become excited

hope that helps

8 0

4 years ago

One of relatively few reactions that takes place directly between two solids at room temperature is Ba(OH)2 · 8H2O + ammonium th

Hatshy [7]

Answer:

$\boxed{\text{3.1 g}}$

Explanation:

We will need an equation with masses and molar masses, so let’s gather all the information in one place.

M_r: 315.46 76.12

Ba(OH)₂·8H₂O + 2NH₄SCN ⟶ Ba(SCN)₂ + 2NH₃ + 10H₂O

m/g: 6.5

1. Moles of Ba(OH)₂·8H₂O

$\text{Moles of Ba(OH)$_{2}\cdot $8H$_{2}$O}\\= \text{ 6.5 g Ba(OH)$_{2}\cdot $8H$_{2}$O} \times \dfrac{\text{1 mol Ba(OH)$_{2}\cdot $8H$_{2}$O}}{\text{ 315.46 g Ba(OH)$_{2}\cdot $8H$_{2}$O}}\\= \text{0.0206 mol Ba(OH)$_{2}\cdot $8H$_{2}$O}$

2. Moles of NH₄SCN

The molar ratio is 2 mol NH₄SCN:1 mol Ba(OH)₂·8H₂O

$\text{Moles of NH$_{4}$SCN} =\text{0.0206 mol Ba(OH)$_{2}\cdot $8H$_{2}$O} \times \dfrac{\text{2 mol NH$_{4}$SCN}}{\text{1 mol Ba(OH)$_{2}\cdot $8H$_{2}$O}}\\= \text{0.0412 mol NH$_{4}$SCN}$

3. Mass of NH₄SCN

$\text{Mass of NH$_{4}$SCN} = \text{0.0412 mol NH$_{4}$SCN} \times \dfrac{\text{76.12 g NH$_{4}$SCN}}{\text{1 mol NH$_{4}$SCN}} =\\\textbf{3.1 g NH$_{4}$SCN}\\\\\text{You must use }\boxed{\textbf{3.1 g}}\text{ NH$_{4}$SCN}$

5 0

4 years ago