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__Mg(s) + __HCI(aq) *arrow pointing right* __MgCi2(aq) + __H2(g)

1. After balancing the reaction above, what is the coefficient for hydrogen (H2)? * 2 points
1
2
3
4

2. What type of reaction is this? * 2 points
Synthesis
Decomposition
Single Replacement
Double Replacement

Use the following reaction to answer questions 3-4.
N2 + H2 *arrow pointing right* NH3

3. After balancing the reaction above, what is the coefficient for H2? * 2 points
1
2
3
4

4. What type of reaction is this? * 2 points
Synthesis
Decomposition
Single Replacement
Double Replacement

5. Which is a sign that a chemical reaction occurred? * 2 points
Color change
Formation of a gas (bubbles)
Temperature change
All are signs of a chemical reaction

6. Which of the following is NOT a strong acid? * 2 points
H2S
HCl
HNO3
HI

7. Which of the following is NOT a property of an acid? * 2 points
tastes sour
usually reacts with a metal changes
the color of an indicator
feels slippery

8. Detergent has a pH of about 10. Is detergent acidic, basic, or neutral? * 2 points acidic
basic
neutral

9. Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2? * 2 points
Na + Br2 --> NaBr
2Na + Br2 --> NaBr
Na + Br2 --> 2NaBr
2Na + Br2 --> 2NaBr

10. Which of the following is NOT a common property of bases? * 2 points
feels slippery
tastes bitter
reacts with metals
changes colors of indicators

11. Hydrochloric acid would have a pH in what range? * 1 point
0-6
7
8-14

12. A brand of shampoo has a pH between 5-6. What would it be considered to be? * 2 points
strong acid
weak acid
neutral
weak base
strong base

13. When a strong acid reacts complete with a strong base (a neutralization reaction), what compounds are always formed? * 2 points salt and water salt only metal oxides and water metal oxides only 14. Which pH indicates a solution of a base? * 1 point
pH = 1
pH = 3
pH = 7
pH = 12

Respuesta :

kenmyna

question  1

Mg  + 2HCl→ MgCl2 + H2

after balancing the coefficient for H2   is 1

explanation

since 1  is in front of H2  it is the coefficient for H2


question  2

 the reaction is single replacement

explanation

  • because  single replacement  occurs when one element  replaces another.  
  • for  the reaction of  Mg + 2HCl→MgCl2 +H2   Chlorine  

 Question  3

The   coefficient  of  H2  is 3

explanation

  • from  the balanced chemical reaction
  • that is  N2 +3H2 →2NH3  the coefficient  in  front of H2  is   3

 question  4

N2 + 3H2 → 2NH3  is  a  synthesis  reaction

explanation;

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.

question 5

  1. 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.

Question 6

H2S is not  a strong acid

explanation

  • 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

question 7

feels slippery  is not  a property of an acid

explanation

  • feel  slippery is an example of a  base
  •  The properties of an acid are
  1. sour taste
  2. changes the color of an indicator
  3. usually react with metal among  others

 Question   8

detergent with a PH of about  10  is a  basic

explanation

  • Base has    a Ph  which range  from 7.1 to  14
  • since  the detergent  has a PH of 10 is a basic

Question 9

The balanced chemical equation  for the synthesis  of NaBr is

2Na  + Br2 →2 NaBr

explanation

 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

Question 10

 reacts with metals  is not  a common  property of  a base

 Explanation

  • base has  
  1. bitter taste,
  2. feels slippery
  3. turn red litmus paper blue  among others

 question  11

Hydrochloric acid have  a PH   in  0-6 range

explanation

  • HCl  is a strong  acid  
  •  acid has a PH  which are below PH  of 7  hence HCl  has a PH which range from 0-6

Question 12

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

question 13

The PH  that indicate  a  solution  of a  base is a PH of 12

 Explanation

  • base  has a PH  which range between 7-14, hence  a  PH of 12   indicate that it is a  Base

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