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Ugo [173]
2 years ago
8

Josie see's lightning off in the distance. A few seconds later she hears thunder. What can Josie conclude?

Chemistry
1 answer:
ycow [4]2 years ago
4 0
The answer is b) light waves travel faster than sound waves. 
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2Al + 6HCl → 2AlCl3 + 3H2 If the chemical reaction produces 129 grams of AlCl3, how many grams of H2 are also produced?
faust18 [17]

So,

Our conceptual plan is as follows:

g AlCl3 --> mol AlCl3 --> mol H2 --> g H2

\frac{129g\ AlCl_3}{133.4g/mol}\ *\frac{3mol\ H_2}{2mol\ AlCl_3}\ *2.016g/mol \\ \\=2.92 g\ H_2

Hope this helps!

5 0
2 years ago
Read 2 more answers
Which of the following is an example of a physical change? A) grinding coffee beans B) baking a cake C) converting water to hydr
lara [203]

Answer: A) grinding coffee beans

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

1. Grinding coffee : Only change in size takes place, thus a physical change

2. Baking a cake: the chemical reaction occurs by combination of flour with oxygen , thus a chemical change.

3.:converting water to hydrogen and oxygen: The decomposition iof water takes place, thus is a chemical change

4.Burning of coal: the chemical reaction occurs by combination of carbon with oxygen , thus a chemical change.

5 0
2 years ago
Can somebody answer this for me
valkas [14]

Answer: C (Option 3)

Cs < Cl < F

Cesium is the least electronegative atom.

Fluorine is the most electronegative atom.

5 0
3 years ago
17 Two substances in a mixture differ in density and particle size. These properties can be used to(1) separate the substances
belka [17]
If they're different sizes and densities, you are able to separate the substances. 
6 0
3 years ago
Read 2 more answers
How many moles of h+ are associated with the acid h2so3 during neutralization?
Katena32 [7]

H2SO3 or sulfurous acid is actually a strong acid. We know for a fact that strong acids completely dissociate into its component ions in a solution, that is:

 

<span>H2SO3 -->  2H+  +  SO3-</span>

 

<span>So from the equation above, there are 2 moles of H+</span>

8 0
3 years ago
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