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Korolek [52]
3 years ago
10

What is a highly active center of a young galaxy called

Chemistry
2 answers:
quester [9]3 years ago
7 0
The answer is quasar.
QveST [7]3 years ago
5 0
The answer is <span>quasar I believe.</span>
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How many kilojoules of heat are required to melt a 10-g popsicle is 0°C ? Assume the particle has the same molar mass and heat o
Fantom [35]
<h3><u>Answer;</u></h3>

3.4 kJ

<h3><u>Explanation</u>;</h3>

Taking the mass of water as 10.0 g

Moles of water = Mass /molar mass

Moles of water in 10.0 g;

= 10g H2O x 1mol/18g

=0.56mol

But, 1 mole of water = 6.01 kJ

Hence;

6.01kJ/1mol H2O= x kJ/.56mol,

               x = <u>3.4kJ</u>

4 0
4 years ago
2) John cut a pineapple into 9-millimeter-wide cubes. How many
Maurinko [17]

Answer:

I think the answer is 729 cubic millimeters.

8 0
4 years ago
Read 2 more answers
G the normal range of the ph of blood is between 7.35 and 7.45; variations beyond this range have significant health implication
Fiesta28 [93]

Answer : the hydrogen ion concentrations for pH = 7.35 and pH = 7.45 are 4.46 x 10⁻⁸ M and 3.54 x 10⁻⁸ M respectively.

When the pH of a solution is less than 7, the hydrogen ion concentration is higher and therefore the solution is acidic.

On the other hand, when the pH of a solution is greater than 7, hydroxide ion concentration is higher and the solution acts as a base.

The normal pH range of blood is given as 7.35 - 7.45  which is greater than 7. That means blood is slight basic in nature.

Let us find hydroxide ion concentration of blood.

pH + pOH = 14

7.35 + pOH = 14

pOH = 6.65

pOH = - log [OH-]

[OH-] = 10^{-6.65}

[OH-] = 2.24 \times 10^{-7}

Ionic product of water is written as,

[H+] [OH-] = 1 \times 10^{-14}

Let us plug in the calculated value of [OH-]

[H+] = \frac{1 \times 10^{-14}}{2.24 \times 10^-7} = 4.46 \times 10^{-8} M

The hydrogen ion concentration for pH = 7.35 is 4.46 x 10⁻⁸ M

Calculation of [H+] for pH = 7.45

pOH = 6.55

[OH-] = 2.82 x 10⁻⁷

[H+] = \frac{1 \times 10^{-14}}{2.82 \times 10^-7} = 3.54 \times 10^{-8} M

Similarly, for pH = 7.45, we get hydrogen ion concentration of 3.54 x 10⁻⁸ M.

8 0
4 years ago
Which of the following conditions creates the largest waves?
SashulF [63]

Answer:

strong winds that blow in short spurts over a small distance

Explanation:

Generally, the most common factor that causes the largest waves in the ocean is winds. this is also called wind-driven waves of the ocean when the surface wind flows on the surface of the ocean, this disturbance creates the friction between surface wind and surface of the ocean which creates waves in the ocean

6 0
3 years ago
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Why is there a need for increased recycling to preserve phosphorus
sesenic [268]

Answer:

The phosphorus minerals deposits that are available right now are not enough for the future. A large part of food production depends on phosphorus being produced. Phosphorus is commonly used as fertilizer and a lot of farmers are dependent on it.

5 0
3 years ago
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