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svlad2 [7]
2 years ago
13

All atoms of the same element have the same:

Chemistry
2 answers:
Korvikt [17]2 years ago
8 0
They have the same number of protons
avanturin [10]2 years ago
6 0

Answer:

Number of protons

Explanation:

The number of protons (the atomic number) determines the identity of the element.

The <em>number of neutrons may differ</em>, in which case the mass and the mass number (number of protons + neutrons) will differ, but all atoms of the same element will have the same number of protons.

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How many moles of KCl are in <br> 28g of KCl?
eduard

Answer:

0.38 moles KCl

Explanation:

(28 g KCl) / (74.55 g/mol KCl) = 0.38 moles KCl

7 0
2 years ago
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What does the atomic number represent?
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C. The number of protons in the atoms nucleus.
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3 years ago
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6. Would you describe each of these temperatures as warm, hot, or cold?
mash [69]

Answer:

b: Hot

a: Cold

c: Cold

d: Warm

e: Warm

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g: Hot

Explanation:

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2 years ago
Name two compounds in unpolluted air?
goblinko [34]
Nitrogen and oxygen are in unpolluted air

6 0
3 years ago
Use one of your experimentally determined values of k, the activation energy you determined, and the Arrhenius equation to calcu
stealth61 [152]

Answer:

Explanation:

Use one of your experimentally determined values of k, the activation energy you determined, and the Arrhenius equation to calculate the value of the rate constant at 25 °C. Alternatively, you can simply extrapolate the straight line plot of ln(k) vs. 1/T in your notebook to 1/298 , read off the value of ln(k), and determine the value of k. Please put your answer in scientific notation. slope=-12070, Ea=100kJ/mol, k= 0.000717(45C), 0.00284(55C), 0.00492(65C), 0.0165(75C), 0.0396(85C)

Explanation;

According to Arrhenius equation:

i.e. ln(k2/k1) = -Ea/R (1/T2 - 1/T1)

Where, k1 = 0.000717, T1 = 45 oC = (45+273) K = 318 K

T2 = 25 oC = (25 + 273) K = 298 K

i.e. ln(k2/0.000717) = -12070 (1/298 - 1/318)

i.e. ln(k2/0.000717) = -2.54738

i.e. k2/0.000717 = e^{-2.54738}

= 0.078286

Therefore, the required constant (k2) = 0.078286 * 0.000717 = 5.61*10^-^5

6 0
3 years ago
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