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3 years ago

I need help with this

Chemistry

1 answer:

never [62]3 years ago

8 0

Answer:

It would be the last one because the way earth is tilted the sun rays would be pointing at the Northern Hemisphere more than the Southern Hemisphere

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0.25 L of aqueous solution contains 0.025g of HCLO4 (strong acid) what will be the Ph of the solution g

Elan Coil [88]

Answer:

The pH of the solution will be 3

Explanation:

The strength of acids is determined by their ability to dissociate into ions in aqueous solution. A strong acid is any compound capable of completely and irreversibly releasing protons or hydrogen ions, H⁺. That is, an acid is said to be strong if it is fully dissociated into hydrogen ions and anions in solution.

Being pH=- log [H⁺] or pH= - log [H₃O⁺] and being a strong acid, all the HClO₃ dissociates:

HClO₄ + H₂O → H₃O⁺ + ClO₄-

So: [HCLO₄]= [H₃O⁺]

The molar concentration is:

$molar concentration=\frac{number of moles of solute}{volume solution}$

The molar mass of HClO₄ being 100 g / mole, then if 100 grams of the compound are present in 1 mole, 0.025 grams in how many moles are present?

$moles of HClO_{4} =\frac{0.025 grams*1 mole}{100 grams}$

moles of HClO₄= 0.00025

Then:

$[HClO_{4}]=\frac{0.00025 moles}{0.25 L}$

$[HClO_{4}]=0.001 \frac{ moles}{ L}$

Being [HCLO₄]= [H₃O⁺]:

pH= - log 0.001

pH= 3

The pH of the solution will be 3

4 0

4 years ago

The forms a food substance into small balls and then pushes them into the_____.

KatRina [158]

During the digestion process, the first step would be mastication, lubrication with the saliva, and later on is being formed into a bolus. Bolus is the term used for food substance that is turned into small balls. When the bolus is formed, this is then pushed or moved to the stomach.

5 0

3 years ago

A charged atom or particle is a(n) _____. compound ion neutron valence

mel-nik [20]

This would be an ion

Hope this helps :)

4 0

4 years ago

PLZ HELP PLZ NO WRONG ANSWERS

baherus [9]

The answer to the question is D

3 0

3 years ago

Read 2 more answers

How much does 0.0273 moles of Na2O weigh

devlian [24]

Answer:

1.69 g Na₂O

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic Table
Using Dimensional Analysis

Explanation:

Step 1: Define

0.0273 mol Na₂O

Step 2: Identify Conversions

Molar Mass of Na - 22.99 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Na₂O - 2(22.99) + 16.00 = 61.98 g/mol

Step 3: Convert

$0.0273 \ mol \ Na_2O(\frac{61.98 \ g \ Na_2O}{1 \ mol \ Na_2O} )$ = 1.69205 g Na₂O

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

1.69205 g Na₂O ≈ 1.69 g Na₂O

6 0

3 years ago