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gizmo_the_mogwai [7]
4 years ago
15

In a beaker, sugar is dissolved in water, and then the water is heated and evaporates. The sugar is recovered, and heat is again

applied. Vapor is released, and the material in the beaker changes from white to black. What must you know to determine if a chemical change occurred?
A) the boiling point of water

B) the boiling point of sugar

C) the identity of the black substance

D) temperature at which sugar evaporates
Chemistry
2 answers:
mixer [17]4 years ago
7 0
Identity of black substance
nata0808 [166]4 years ago
3 0
I agree C) seems to be the correct answer
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Please help me. Can you explain energy principle level?
Likurg_2 [28]
<span>Rules for the Principal Energy Level. A principal energy level may contain up to 2n2 electrons, with n being the number of each level. The set of three p orbitals can hold up to 6 electrons. Thus, the second principal energy level can hold up to 8 electrons, 2 in the s orbital and 6 in the p orbital.</span>
8 0
4 years ago
Nylon is an important component in many products. One step in the production of nylon is the reaction of cyclohexane with oxygen
UkoKoshka [18]

Answer:

Follows are the answer to this question:

Explanation:

pleas find the attachment file.

Formula for ΔE:

\Delta E =  \sum \text{Bond energy of recatants}- \sum \text{Bond energy of Products}

    = 6 ( B.E_{C-C}) +12 (B.E_{C-H}) +(B.E_{o \ = \ o}) - 6(B.E_{C-C})-10(B.E_{C-H}) -( B.E_{C=0}) -2(B.E_{0-H})\\\\ =  \bold{2 (B.E_{C-H}) +(B.E_{o \ = \ o})  -( B.E_{C=0}) -2(B.E_{0-H})}\\\\

to calculate the value for ΔE put the value in above formula:

4 0
3 years ago
How many grams of ice at -13 deg C must be added to 711 grams of water that is initially at a temperature of 87 deg C to produce
Basile [38]

Answer:

The answer to your question is m = 4.7 kg

Explanation:

Data

Ice                                   Water

mass = ?                          mass = 711 g

T₁ = -13°C                         T₁ = 87°C

T₂ = 10°C                         T₂ = 10°C

Ch = 2090 J/kg°K          Cw = 4180 J/kg°K

Process

1.- Convert temperature to kelvin

T₁ = 273 + (-13) = 260°K

T₁ water = 87 + 273 = 360 °K

T₂ = 10 + 273 = 283°K

2.- Write the equation of interchange of heat

                 - Heat lost = Heat absorbed

               - mwCw(T₂ - T₁) = miCi(T₂ - T₁)

-Substitution

              - 0.711(4180)(10 - 87) = m(2090)(10 - (-13))

- Simplification

                            228842.46 = 48070m

                            m = 228842.46/48070

-Result

                            m = 4.7 kg

4 0
4 years ago
Another word for "basic" is?
natita [175]

Answer: Fundamental, Key, vital, crucial

Explanation:

5 0
3 years ago
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Density is the ratio of mass to volume. Another way to say this is
Oliga [24]

Answer:

my teacher would let u say the density to mass is the ratio but i think everyone's different

5 0
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