Is roasting a marshmallow a Chemical or Physical reaction?

Chemistry

2 answers:

svetoff [14.1K]3 years ago

8 0

I'm going to go with Physical.

Verdich [7]3 years ago

7 0

It's a chemical reaction. Usually when the color changes, it indicates a chemical reaction. Keep in mind that color is a physical property.

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Use the data in the table above to calculate an approximate ΔH∘ in kilojoules for the synthesis of hydrazine from ammonia:

ankoles [38]

DeltaH formation = deltaH of broken bonds - deltaH of formed bonds

Broken bonds: tiple bond N-N and H-H bond
Formed bonds: N-H and N-N bonds

You also have to take note of the molar coefficients

deltaH formation = [(N≡N) + 2 * (H-H)] - [4 * (N-H) + (N-N)]
= (945 + 2*436) - (4*390 + 240)
= 17 kJ/mol

The answer is 17 kJ/mol.

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3 years ago

Which bond is broken when energy is released?

blsea [12.9K]

Energy is released when a new bonds form.

4 0

3 years ago

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How many moles are in 99.5 grams of titanium? Round your answer to the nearest hundredth. Be sure to include units.

AlekseyPX

Answer:

1000

Explanation:

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Can someone help me please

MArishka [77]

Answer:

Group 4A (or IVA) of the periodic table includes the nonmetal carbon (C), the metalloids silicon (Si) and germanium (Ge), the metals tin (Sn) and lead (Pb), and the yet-unnamed artificially-produced element ununquadium (Uuq).

The Group 4A elements have four valence electrons in their highest-energy orbitals (ns2np2). Carbon and silicon can form ionic compounds by gaining four electrons, forming the carbide anion (C4-) and silicide anion (Si4-), but they more frequently form compounds through covalent bonding. Tin and lead can lose either their outermost p electrons to form 2+ charges (Sn2+, the stannous ion, and Pb2+, the plumbous ion) or their outermost s and p electrons to form 4+ charges (Sn4+, the stannic ion, and Pb4+, the plumbic ion).

Carbon (C, Z=6).

Carbon is most familiar as a black solid is graphite, coal, and charcoal, or as the hard, crystalline diamond form. The name is derived from the Latin word for charcoal, carbo. It is found in the Earth's crust at a concentration of 480 ppm, making it the 15th most abundant element. It is found in form of calcium carbonate, CaCO3, in minerals such as limestone, marble, and dolomite (a mixture of calcium and

Explanation:

THIS ALL I KNOW

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3 0

3 years ago

Which is an example of an organism? A. an octopus B. sand granules C. water D. the colors of a feather

denpristay [2]

A. An octopus

An organism is an individual animal, plant, or single-celled life form.

The octopus is the only living thing listed so that is why it is the example of an organism

5 0

3 years ago