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MrRa [10]
4 years ago
12

Describe the ways you can know that a chemical reaction has occurred.

Chemistry
2 answers:
Bad White [126]4 years ago
8 0
Signs that a chemical reaction is occurring are: 1. change in color 2. change in odor 3. change in pH, as in changes from acid to base or base to acid
Pachacha [2.7K]4 years ago
6 0

The color can change  so can the PH  and oder.

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Which of the following has the largest number of molecules? a 1 g of benzene, C6H6 b 1 g of formaldehyde, CH2O c 1 g of TNT, C7H
Pachacha [2.7K]

Answer: 1g of formaldehyde

Explanation:

Molar Mass of benzene (C6H6) = (12x6) + (6x1) = 78g/mol

1mole(78g) of benzene contains 6.02x10^23 molecules.

1g of benzene with contain = (6.02x10^23) /78 = 7.72x10^21 molecules

Molar Mass of formaldehyde (CH2O) = 12 +2+16 = 30g/mol

1mole (30g) of formaldehyde contains 6.02x10^23 molecules.

1g of formaldehyde will contain = (6.02x10^23) /30 = 2.01x10^22 molecules

Molar Mass of TNT(C7H5N3O6) = (12x7)+(5x1)+(14x3)+(16x6) = 227g/mol

1mole(227g) of TNT contains 6.02x10^23 molecules.

1g of TNT will contain = (6.02x10^23)/227 = 2.65x10^21 molecules

Molar Mass of naphthalene (C10H8) = (12x10) +8 =128g/mol

1mole(128g) of naphthalene contains 6.02x10^23 molecules.

1g of naphthalene will contain = (6.02x10^23)/128 = 4.7x10^21 molecules

Molar Mass of glucose(C6H12O6) = (12x6) + 12 +(16x6) = 180g/mol

1mole(180g) of glucose contains 6.02x10^23 molecules.

1g of glucose will contain = (6.02x10^23)/180 = 3.34x10^21 molecules

Therefore, 1g of each of the compound contains the following:

Benzene = 7.72x10^21 molecules

Formaldehyde = 2.01x10^22 molecules

TNT = 2.65x10^21 molecules

Naphthalene = 4.7x10^21 molecules

Glucose = 3.34x10^21 molecules

From the above, we see clearly that formaldehyde has the largest number of molecules

3 0
3 years ago
Please help will mark brainliest!! What is the main point of paragraph 3?
zmey [24]

Answer:

the highest frequency

Explanation:

8 0
3 years ago
16. Magnesium has a density of 1.74g/cm3. A strip of magnesium metal measures 0.104m long and is 2.52mm wide. If the mass of the
KengaRu [80]

Answer:

228.1 m

Explanation:

Area of the magnesium strip = 0.104m  * 2.52 * 10^-3 = 2.62 * 10^-4 m^2

Density of Magnesium strip = 1.74g/cm3

Mass of magnesium strip = 0.104 g

But

density = mass/ area * thickness

density * area * thickness = mass

thickness  = mass/density * area

thickness  = 0.104 g/2.62 * 10^-4  * 1.74

thickness  = 0.104 g/ 4.56 * 10^-4

thickness  =  228.1 m

8 0
3 years ago
Lead(II) iodate (Pb(IO3)2) has a solubility product constant of 3.69 x 10-13. Calculate the molar solubility of Pb(IO3)2 in wate
torisob [31]
The answer for this question is Option C. 4.52x10^-5
7 0
3 years ago
Read 2 more answers
I need help I don’t know anything
svetoff [14.1K]

Answer:

2NaOH + 2HCl → 2NaCl + H2O(HOH)

Explanation:

This is an acid-base reaction (neutralization): NaOH is a base, HCl is an acid.

3 0
2 years ago
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