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victus00 [196]
3 years ago
9

How do you know if a reaction is exothermic? Enter your answer in the space provided

Chemistry
1 answer:
monitta3 years ago
3 0
Exothermic is a chemical reaction in which heat is released. Lighting a candle is an example of an exothermic because the flame is the heat being released. 
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1. An oxide of chromium is found to have the following % composition: 68.4% Cr
abruzzese [7]

Answer:

Empirical formula is Cr₂O₃.

Explanation:

Given data:

Percentage of Cr = 68.4%

Percentage of O = 31.6%

Empirical formula = ?

Solution:

Number of gram atoms of Cr = 68.4 / 52 = 1.3 2

Number of gram atoms of O = 31.6 / 16 = 1.98

Atomic ratio:

                            Cr               :         O

                           1.32/1.32     :       1.98/1.32

                               1              :        1.5

Cr : O = 1 :  1.5

Cr : O = 2(1 : 1.5)

Empirical formula is Cr₂O₃.

6 0
3 years ago
Which has a larger electronegativity O or F?
jarptica [38.1K]

F. because electronegativity generally increases as you move from left to right across a periodic table, and F is farther right than O

6 0
3 years ago
Which substance contains a bond with the greatest ionic character?
agasfer [191]
Hello!

The correct answer is 1. KCI.

I really hope this helped you out! c:
4 0
3 years ago
What mass of znco3 contains 6.11×1022 o atoms? give your answer correctly to three significant digits?
nordsb [41]

Using Avogadros number, we can get that 1 mole of an atom contain 6.022 x 10^23 atoms. Therefore we can use this conversion factor to get the number of moles:

moles ZnCO3 = 6.11 x 10^22 atoms * (1 mole / 6.022 x 10^23 atoms) = 0.10146 moles

 

The molar mass of ZnCO3 is about 125.39 g/mol, therefore the mass is:

mass ZnCO3 = 0.10146 moles * (125.39 g / mol)

<span>mass ZnCO3 = 12.72 g</span>

5 0
3 years ago
Read 2 more answers
Calculate the Ph when 15 ml of 0. 26 m HCl is titrated with 45 ml of 0. 10 m NaOH.
Svetllana [295]

Answer:

it is b i took the test

Explanation:

5 0
2 years ago
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