A solution with a pH of 8.0 isa. acidic.
b. neutral.
c. weakly basic.
d. strongly basic.

Answers

Answer 1

Answer:

A solution with a pH of 8.0 is weakly basic. Thus ,the correct option is C.

The pH scale gives the measure of the acidity or basicity of a solution. It ranges from 0 to 14, where a pH of 7 is considered neutral. Solutions which have a pH less than 7 are acidic, while solutions which have a pH greater than 7 are basic.

In this case, since the pH is 8.0, which is greater than 7, the solution is basic. However, it is important to note that the basicity of the solution is weak, as it is only slightly above neutral.

For example, think of a pH of 8.0 as being similar to water from a freshwater lake. It's not strongly basic like bleach or ammonia, but it still has a slightly basic nature compared to a neutral solution.

Thus, the correct option is C.

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Answer 2

Answer: c. weakly basic. the higher the pH, the more basic/ alkalo

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Identify each of the following compounds as binary or ternary. Then write the chemical formula for each ionic compound.Nickel(III)oxide
Copper (II)iodide
Tin(IV) nitride
Choro minim (II)bromide
Iron(III)phosphide

Answers

binary compounds have 2 different elements, and ternary compounds have 3
Nickel(III)oxide: binary, Ni2O3
Copper (II)iodide: binary, CuI2
Tin(IV) nitride: binary, Sn3N4
Chromium (II)bromide: binary, CrBr2
Iron(III)phosphide: binary, FeP

Final answer:

Compounds are classified as binary or ternary based on the number of elements present in the compound. The chemical formulas for the given compounds include nickel(III)oxide, copper(II)iodide, tin(IV)nitride, chloro minimium(II)bromide, and iron(III)phosphide.

Explanation:

In order to identify whether a compound is binary or ternary, we need to analyze its chemical formula. Binary compounds consist of two elements, while ternary compounds consist of three or more elements. The chemical formula for each compound is as follows:

Nickel(III)oxide - ternary compound
Copper(II)iodide - binary compound
Tin(IV)nitride - ternary compound
Chloro minium(II)bromide - ternary compound
Iron(III)phosphide - ternary compound

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You have a stock bottle of HCl (aq) which is 12.1M, You need 400 mL of 0.10M HCl. How much of the acid and how much water will you need?

Answers

Mols of acid needed: 0.4 liters x 0.10 mol/liter = 0.04 mol

Volumen of acid in the bottle than contaiins 0.04 mol of acid: V = #moles/M = 0.04 mol/12.1 mol/liter = 0.003306 liters = 3.306 ml

Then you need 3.3 ml of acid from the bottle and 396.7 ml of pure water to get 400 ml of acid 0,1 M

How does thermal energy transfer when a room is heated by a furnace? a
Hot air is absorbed by the objects in the room; cold air expands and rises.

b
Hot air is circulated through the room; the hot air rises, and cold air falls.

c
Hot air makes direct physical contact with the objects in the room and rises.

d
Hot air is transmitted by electromagnetic waves; the hot air rises and falls.

Answers

Answer: D is the right answer pls make me brainliest

Explanation:

Which of the following circumstances will result in a reaction that is spontaneous only at low temperatures?A.) positive enthalpy change and positive entropy change
B.) negative enthalpy change and negative entropy change
C.) positive enthalpy change and negative entropy change
D.) negative enthalpy change and positive entropy change

Answers

Answer: B.) negative enthalpy change and negative entropy change

Explanation:

According to Gibb's equation:

$\Delta G=\Delta H-T\Delta S$

$\Delta G$ = Gibbs free energy

$\Delta H$ = enthalpy change

$\Delta S$ = entropy change

T = temperature in Kelvin

$\Delta G$ = +ve, reaction is non spontaneous

$\Delta G$ = -ve, reaction is spontaneous

$\Delta G$ = 0, reaction is in equilibrium

Thus when $\Delta H$ = -ve

$\Delta S$ = -ve

$\Delta G=(-ve)-T(-ve)$

$\Delta G=(-ve)(+ve)=-ve$ only at low temperature

Reaction is spontaneous only if temperature is low.

D) negative enthalpy and positive entropy,
since the formula G=H-TS when a reaction is spontaneous then G must be negative, and if values of t are low then the only time it is guaranteed to be a negative G value is if H is positive and S is negative

Calculate the morality of each of the following solutions: a. 15.4 g KCl in 289.2 mL solution b. 14.4 g of CaCl2 in 0.614 L solution c. 28.0 mL of 3.00 M H2SO4 diluted to 0.250 L

Answers

The answer is:
a. 0.712 M
b. 0.210 M
c. 0.336 M

Molarity is a measure of the concentration of solute in a solution.
It can be expressed as moles of solute ÷ volume of solution:
c = n ÷V
where:
c - concentration of solute,
n - moles of solute
V - volume of solution

n can be expressed as:
n = m ÷ Mr
where:
n - moles of solute
m - mass of solute
Mr - relative molecular mass

a. We know volume:
V = 289.2 mL = 0.2892 L
We need n and c.

n = m ÷ Mr
m = 15.4 g
Mr (KCl) = 74.55 g/mol
n = 15.4 g ÷ 74.55 g/mol
n = 0.206 mol

Thus,
c = 0.206 mol ÷ 0.2892 L
c = 0.712 mol/L = 0.712 M

b. We know volume:
V = 0.614 L
We need n and c.

n = m ÷ Mr
m = 14.4 g
Mr (CaCl₂) = 110.98 g/mol
n = 14.4 g ÷ 110.98 g/mol
n = 0.129 mol

Thus,
c = 0.129 mol ÷ 0.614 L
c = 0.210 mol/L = 0.210 M

c. We can use formula:
m₁V₁ = m₂V₂
m₁ = 3 M
V₁ = 28 mL= 0.028 L
m₂ = ?
V₂ = 0.250 L
Thus:
3 M × 0.028 L = m₂× 0.250 L
m₂ = 0.336 M

What volume measured in stp will 3.75 grams of helium gas occupy?