<h2>question 1</h2>
Mg + 2HCl→ MgCl2 + H2
after balancing the coefficient for H2 is 1
<em><u>explanation </u></em>
since 1 is in front of H2 it is the coefficient for H2
question 2
the reaction is single replacement
<u><em>explanation</em></u>
- because single replacement occurs when one element replaces another.
- for the reaction of Mg + 2HCl→MgCl2 +H2 Chlorine
<h2> Question 3</h2>
The coefficient of H2 is 3
<em><u>explanation</u></em>
- from the balanced chemical reaction
- that is N2 +3H2 →2NH3 the coefficient in front of H2 is 3
<h2 /><h2> question 4</h2>
N2 + 3H2 → 2NH3 is a synthesis reaction
<u><em>explanation; </em></u>
Synthesis reaction occurs when two or more reactants combine to form a single product.
- N2 reacted with H2 to form NH3 (ammonia) hence it is an example of synthesis reaction.
<h2>question 5</h2>
- The sign that shows that a chemical reaction has occurred is color change, change in temperature and formation of a gas (bubble)
color change change in temperature, formation of precipitate and formation of a gas(bubble) is always an indicator of an occurrence of a chemical change.
<h2>
Question 6</h2>
H2S is not a strong acid
<u><em>explanation</em></u>
- strong acid undergo a complete electrolysis when dissociate in water for example HNO3
- weak acid undergo a partial electrolysis when dissociate in water for example H2S
<h2>question 7</h2>
feels slippery is not a property of an acid
<u><em>explanation</em></u>
- feel slippery is an example of a base
- The properties of an acid are
- sour taste
- changes the color of an indicator
- usually react with metal among others
<h2> Question 8</h2>
detergent with a PH of about 10 is a <u><em>basic</em></u>
<em><u>explanation</u></em>
- Base has a Ph which range from 7.1 to 14
- since the detergent has a PH of 10 is a basic
<h2>Question 9</h2>
The balanced chemical equation for the synthesis of NaBr is
2Na + Br2 →2 NaBr
<u><em>explanation</em></u>
This is because the equation obey the law of mas conversation
for example it has 2 atoms of Na in both reactant and product side
<h2>Question 10</h2>
reacts with metals is not a common property of a base
<u><em>Explanation</em></u>
- bitter taste,
- feels slippery
- turn red litmus paper blue among others
<h2> question 11</h2>
Hydrochloric acid have a PH in 0-6 range
<u><em>explanation</em></u>
- acid has a PH which are below PH of 7 hence HCl has a PH which range from 0-6
<h2>Question 12</h2>
A brand shampoo which has a PH between 5 -6 is a weak acid
- generally acid has a PH below 7
- weak acid has a PH of between 5 -6 therefore brand shampoo is a weak acid
<h2>
question 13</h2>
The PH that indicate a solution of a base is a PH of 12
<em><u>Explanation</u></em>
- base has a PH which range between 7-14, hence a PH of 12 indicate that it is a Base
