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gregori [183]
3 years ago
12

How many moles are in 1.29 x 1024 hydrogen atoms in HF

Chemistry
1 answer:
zepelin [54]3 years ago
7 0

Answer:

No. Moles  = 2.142   mole

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12. Describe the results of a chemical change. List four<br> indicators of chemical change.
marshall27 [118]

Answer:

1. Color Change

2. Change in temperature

3. Noticiable Odor

4. Formation of bubbles

8 0
3 years ago
Radium has a half-life of 1,620 years. In how many years will a 1 kg sample of radium decay and reduce to 0.125 kg of radium?
Tasya [4]
We can calculate years by using the half-life equation. It is expressed as:

A = Ao e^-kt

<span>where A is the amount left at t years, Ao is the initial concentration, and k is a constant.

</span>From the half-life data, we can calculate for k.

1/2(Ao) = Ao e^-k(1620)
<span>k = 4.28 x 10^-4
</span>
0.125 = 1 e^-<span>4.28 x 10^-4 (</span>t)
t = 4259 years
7 0
3 years ago
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What is true of a synthesis reaction?
RUDIKE [14]

There is only one product in a synthesis reaction.

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3 years ago
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In order from lowest to highest frequency,list the different waves of the electromagnetic spectrum
hoa [83]

radio waves

infrared radiation

visible light

ultraviolet radiation

X-rays

gamma rays

7 0
4 years ago
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the movement of molecules from an area of low concentration to an area of high concentration occurs in what transport?
solmaris [256]
Movement of molecules from an area of higher concentration to one of lower concentration is called Diffusion
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