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2 years ago

A reaction which needs to gives off energy to complete the chemical reactions is called an

1 answer:

7 0

<span>A reaction which needs to gives off energy to complete the chemical reactions is called an EXOTHERMIC reaction !!</span>

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How many molecules of carbon dioxide are in 243.6 g of carbon dioxide

rewona [7]

Answer:

Explanation:

First, lets find the molar mass of CO². This is approximately 12 + 2(16) = 44 g/mol. Now, let's set up the conversions.

This is Avogadro's number

↓

243.6g CO² * (1 mol CO² /44g CO²) * (6.023 * 10^23 molecules/ 1 mol)

When we cancel out the units, we are left with 3.33 * 10^23 molecules of carbon dioxide. I hope this makes sense!

4 0

3 years ago

Can you help me with 5.025- 5.030?

goblinko [34]

I am not sure about .030 but i would pick c
.025) b
26)c
27)d
28)d

3 0

3 years ago

The uses of sodium phosphate include clarifying crude sugar, manufacturing paper, removing boiler scale, and washing concrete. W

garri49 [273]

2.4 × 10⁻² is the pH of a solution

What is the short definition of pH?

The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7.
In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

Equation representing the i onization of Na₃PO₄ is as fallow

Na₃PO₄ → PO₄³⁻ + 3Na⁺

Concentration of Na₃PO₄ = $\frac{26.9 * \frac{1 mol}{164 g} }{1 L} = 0.164 M$

Since 1 mol of Na₃PO₄ forms 1 mol of PO₄³⁻ [ PO₄³⁻ ] = [ Na₃PO₄ ] = 0.164 M

Equation representing the i onization of HPO²⁻₄ is as fallow

HPO²⁻₄ → PO₄³⁻ + H⁺

Acidionization constant Ka₃ of HPO²⁻₄ = 4. 17 × 10⁻¹³

Baseionization constant Kb₃ of PO₄³⁻ = Ka₃/ Kb₃

= 1 .0 × 10⁻¹⁴/ 4. 17 × 10⁻¹³ = 2.4 × 10⁻²

Learn more about pH

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4 0

1 year ago

The water lattice: a. is formed from hydrophobic bonds. b. causes ice to be denser than water. c. causes water to have a relativ

Alexus [3.1K]

Answer: Option (d) is the correct answer.

Explanation:

It is known that water loving bonds are called hydrophilic bonds and water hating bonds are called hydrophobic bonds. Since, water is a polar solvent and it is only able to dissolve polar molecules and not non-polar molecules.

Lattice of water and hydrogen bonding are responsible for the various properties of water like cohesion, adhesion, heat of vaporization etc.

Thus, we can conclude that water lattice excludes non-polar substances.

7 0

2 years ago

How do i find a ionic formula? <br><br>for example Ca2+ & S2-

jeka94

Example #1 write the chemical formula for Calcium Oxide

Step 1

-Find the Atomic symbol of the metal and non-metal on the periodic table

CaO

Step 2

Find the charges for Calcium and Oxygen

which are Ca 2+ and O 2-

Step 3

Balance out the charges

They are already balanced out

Here´s the chemical formula for Calcium Oxide

CaO

Example 2 write the chemical formula for Aluminum Oxide

Step 1

-Find the Atomic symbol of the metal and non-metal on the periodic table

Step 2

Find the charges for Aluminum and Oxygen

Which are Al 3+ and O 2-

Step 3

Balance out the charges

You need 2 Aluminum and 3 Oxygen to balance the charges

Al 3+ O 2-

= 6 + O 2-

= 6-

Step 4

If you need more then one element to balance out the charges you identify that by using subscripts

Heres your chemical formula for Aluminum Oxide

$Al_{2} O_{3}$

8 0

2 years ago