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NISA [10]
3 years ago
8

How would you upscale your chemistry learning through

Chemistry
1 answer:
Lelechka [254]3 years ago
4 0

Explanation:

The periodic table brings order to information about the chemical elements. It helps chemists to understand why elements react as they do. Elements in the same group have similar chemical properties. This is because they have the same number of outer electrons and the same valency

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The [H3O+] of a solution is 2.5 x10-7. What is the pOH of the solution?
xz_007 [3.2K]

Answer:

7.4.

Explanation:

∵ pH = -log[H₃O⁺].

∴ pH = -log(2.5 x 10⁻⁷) = 6.6.

<em>∵ pH + pOH = 14.</em>

<em />

∴ pOH = 14.0 - pH = 14.0 - 6.6 = 7.4.

6 0
4 years ago
An Erlenmeyer flask containing 20.0 mL of sulfuric acid of an unknown concentration was titrated with exactly 15.0 mL of 0.25 M
MrRa [10]

Answer:

0.09375M

Explanation:

There are two methods of going about this, either we use dilution formula (easiest and fastest) or we solve through molarity.

Using dilution formula,

C2 (H2SO4) = ?

C1 (NaOH) = 0.25M

V2 (H2SO4) = 20cm³

V1 (NaOH) = 15cm³

However we can solve using molarity method

Equation of reaction =

2NaOH + H2SO4 ====》 Na2SO4 + 2H2O

O.25M of NaOH = 1000cm³

X moles = 15cm³

X = (0.25 * 15) / 1000

X = 0.00375 moles is present in 15cm³ of NaOH

From equation of reaction,

2 moles of NaOH requires 1 mole of H2SO4

Therefore

0.00375 / 2 = 0.001875 moles is present in H2SO4

From the reaction,

0.00187 moles of H2SO4 = 20 cm³

X moles = 1000cm³

X = (0.00187*1000) / 20 = 0.09375M

8 0
3 years ago
To determine the absolute age of rocks and fossils, geologists use _____.
Pavlova-9 [17]

Answer:

The rates of decay of radioactive elements

Explanation:

The age of a rock in years is called its absolute age. Geologists find absolute ages by measuring the amount of certain radioactive elements in the rock. When rocks are formed, small amounts of radioactive elements usually get included.

7 0
4 years ago
KBr will undergo dissociation in solution while benzene will undergo solvation.
Degger [83]
Kbr will undergo dissociation in an aqueous solution. But Benzene will not dissolve in water so it will be a solvent.

hoping this help
8 0
3 years ago
Which of the following describes a reaction that reaches equilibrium?
alexandr1967 [171]

Answer:The product and reactants reach a final, unchanging level.

8 0
3 years ago
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