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geniusboy [140]
3 years ago
11

Chemistry test bound theories

Chemistry
1 answer:
liq [111]3 years ago
5 0

covalent bond is firmed between two atoms

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What mass of hbr (in g) would you need to dissolve a 3.4 −g pure iron bar on a padlock?
vivado [14]

<u>Given:</u>

Mass of pure iron (Fe) = 3.4 g

<u>To determine:</u>

Mass of HBr needed to dissolve the above iron

<u>Explanation:</u>

Reaction between HBr and Fe is

Fe + 2HBr → FeBr₂ + H₂

Based on the reaction stoichiometry-

1 mole of Fe reacts with 2 moles of HBr

# moles of Fe = mass of Fe/atomic mass of Fe = 3.4/56 g.mol⁻¹ = 0.0607 moles

Therefore # moles of HBr = 2*0.0607 = 0.1214 moles

Molar mass of HBr = 81 g/mole

Mass of HBr = 0.1214 moles * 81 g/mole = 9.83 g

Ans: Mass of HBR required is 9.83 g

5 0
3 years ago
How do the atmosphere conditions near the beginning of Precambrian time contrast with the atmosphere conditions that are present
babunello [35]
The early precambrian atmosphere consisted primarily of nitrogen and carbon dioxide with almost no oxygen. 

<span>Today, the atmosphere contains about 20% oxygen, less carbon dioxide and similar amounts of nitrogen. </span>

<span>Photosynthetic green-leaf plants and trees are largely responsible for the change, converting carbon dioxide to oxygen.</span>
5 0
3 years ago
A(n) _____ reaction is a reaction in which an acid and a base react in an aqueous solution to produce a salt and water.
UkoKoshka [18]
<span>A neutralization reaction is a reaction in which an acid and a base react in an aqueous solution to produce a salt and water. An example of a neutralization reaction is the reaction of sodium hydroxide and hydrogen chloride to form sodium chloride and water. Answer is C.</span>
8 0
3 years ago
Which one of the following ions would be negatively charged with a charge of -2?
stiv31 [10]

Answer:

10 electrons 8 protons

Explanation:

p +8 - e10- equals -2

7 0
3 years ago
What is the final temperature of both the water and the iron?​
WITCHER [35]

Hello!

Answer:

32.8 °C

Hope this helps :)

4 0
2 years ago
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