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ArbitrLikvidat [17]
2 years ago
10

What are the key characteristics of a combustion and redox reactions?

Chemistry
1 answer:
katovenus [111]2 years ago
7 0

Answer:

Redox reactions have a reducing agent and a oxidizing agent

Explanation:the reducing agent is more reactive than the oxidizing agent

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The density of pure copper is 8.96 at 20°C. If 5.00 g of pure copper pellets is added to a graduated cylinder containing 14.6 mL
Triss [41]

Answer:

15.2 mL

Explanation:

First we calculate the volume of the copper

volume = \frac{mass}{density}= \frac{5.00 g}{8.96 g/mL} = 0.5580 mL\\

when this volume of copper is added to the water, the water level will rise by the level of the volume of copper. So the final volume is:

14.6 mL + 0.5580 mL = 15.158 mL

Since the measuring cylinder is graduated to one decimal place , we can round this up to 15.2 mL

8 0
3 years ago
How many valence electrons do the halogens possess?
BabaBlast [244]

Answer:

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  • <em>The halogens posses </em><u><em>seven </em></u><em>valence electrons</em>

Explanation:

  • <em>Valence electrons </em>are the electrons in the outermost orbitals of the atoms, which are the orbitals with the highest main energy level (principal quantum number).

  • Halogens are the elements of the group 17 of the periodic table: F, Cl, Br, I, At.

  • You can tell the number of valence electrons of the representative elements from the number of the group to which they belong. For the representative elements, the number of valence electrons equal the unit digit of the group number.

        This table summarizes it:

Group number        number of valence electrons

     1                                      1

     2                                     2

    13                                     3

    14                                     4

    15                                     5

    16                                     6

    17                                      7

    18                                      8

  • So, in conclusion, <em>the halogens possess 7 valence electrons.</em>
7 0
3 years ago
Do you agree or disagree for each one of them and provide evidence why??​
sergiy2304 [10]

Answer:

Disagree

Agree

Agree

Disagree

Explanation:

A chemical change is one in which a new kind of substance is formed. It is always accompanied by energy changes.

  • It is wrong to assert that all chemical changes are dangerous. In our body system, chemical changes are constantly happening.
  • Chemical changes shows the law of conservation of mass in that the amount of reactants and products are always the same.
  • Chemical reactions occur when two substances are chemically combined together.
  • Not all dissolution reaction are chemical changes. For example, when sugar dissolves in water, it is not a chemical change.
6 0
2 years ago
Select the answer that best explains why Sally has blonde hair and Jim has brown hair. (A) Species Diversity
anyanavicka [17]
The answer is Genetic Diversity So B
3 0
3 years ago
Read 2 more answers
What is the answer to this question?​
rodikova [14]

Answer:

Vertebrae

Explanation:

Vertebrae are the 33 individual bones that interlock with each other to form the spinal column. The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx (Fig. 2). Only the top 24 bones are moveable; the vertebrae of the sacrum and coccyx are fused.

7 0
3 years ago
Read 2 more answers
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