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mote1985 [20]
2 years ago
12

What is defined as the ability to do work or to cause changes in matter?

Chemistry
1 answer:
abruzzese [7]2 years ago
4 0

Answer:

energy

Explanation:

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What is one major purpose for an animal to produce unusual sounds, display bright
bezimeni [28]
I would say courtship, we this is when an animal would be looking for a mate. They would want to make themselves different and bright colors could attract a possible mate for them. I hope this helps!
7 0
3 years ago
Which of these statements explains the relationship among elements, compounds, and mixtures? A. Elements are made of compounds a
sweet-ann [11.9K]
The answer is answer D
5 0
3 years ago
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What is the molar mass of 4.23 g of an elemental gas in a 2.5L container at 282K and 1.4 atm?
balu736 [363]

Answer:

27.98g/mol

Explanation:

Using ideal gas law equation;

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

T = temperature (K)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

According to the information given:

V = 2.5L

P = 1.4 atm

T = 282K

n = ?

Using PV = nRT

n = PV/RT

n = 1.4 × 2.5/0.0821 × 282

n = 3.5/23.1522

n = 0.151mol

Using the formula to calculate molar mass of the elemental gas:

mole = mass/molar mass

Molar mass = mass/mole

Molar mass = 4.23g ÷ 0.151mol

Molar mass = 27.98g/mol

6 0
3 years ago
Complete the following conversion.<br> 25.0 °C =<br> °F
olga nikolaevna [1]

Answer: 25°C=77°F

Explanation:

FORMULA

F=9/5 C+32

-----------------------------------

Given: C=25°

F=9/5 C+32

F=9/5 (25)+32

F=45+32

F=77°

Hope this helps!! :)

Please let me know if you have any question

4 0
3 years ago
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Meanings of Ka and pKa (a) Does a strong acid have a greater or lesser tendency to lose its proton than a weak acid? (b) Does th
Sunny_sXe [5.5K]

Answer:

(a) A strong acid has a greater tendency to lose its protons.

(b) A strong acid has a higher Ka than a weak acid.

(c) A strong acid has a lower pKa than a weak acid.

Explanation:

A strong acid has the ability to completely transfer their protons to the water, making a complete dissociation. Instead, a weak acid only dissociates partially, how much it dissociates depends on the acid dissociation constant (Ka).

The weak acids always are in equilibrium, and the equilibrium depends on the acid dissociation constant.

HA + H_{2}O ⇄ A^{-} + H_{3}O^{+}

Thus, a stronger acid with a bigger Ka produces more dissociation and a higher concentration of protons.

The equation that defines pKa is:

pKa = -Log (Ka)

Therefore, a higher pKa means a lower Ka and also a weaker acid.

7 0
3 years ago
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