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3 years ago

In the equation Zn+2HCL ---->ZnCl2 + H 2 the reactants are

1 answer:

4 0

Zn and HCl are the reactant in the equation above. zinc react with 2 moles of Hcl to form zinc chloride and a hydrogen molecule. The one equation means that the reaction proceed to the forward side only therefore no reverse of the reaction.

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Name the hardest artificial substance known?

blagie [28]

The hardest material is diamond. The hardest artificial substance would wurtzite boron nitride. That's basically just man-made diamonds.

4 0

3 years ago

Read 2 more answers

Toluene, C7H8, is used in the manufacture of explosives such as TNT (trinitrotoluene). A 1.500 g sample of liquid toluene was pl

dusya [7]

Answer:

There were 63.67 kJ liberated

If 1 mol of toluene was burned, there would be liberated 3906 kJ / mole

Explanation:

Step 1: Data given

Mass of the toluene sample = 1.500 grams

The temperature of the calorimeter rose from 25.000 °C to 26.413 °C

Write the balanced chemical equation for the reaction in the calorimeter.

C7H8(l) + 9O2(g) ⇒ 7CO2(g) + 4H2O(l)

Step 2: Calculate Q of the calorimeter

Q = C * Δt

Q = 45.06 kJ/ °C * ( 26.413 - 25)

Q = 63.67 kJ

Step 3: Calculate moles of toluene

Moles toluene = mass toluene / molar mass toluene

Moles toluene = 1.500 grams /92.14 g/mol

Moles toluene = 0.0163 moles

Step 4: Calculate energy per mole

energy per mole = 63.67 kJ / 0.0163 moles = 3906 kJ / mole

6 0

3 years ago

Gases do not settle at the bottom of the vessel why

bulgar [2K]

Explanation:

Gases are very less denser also, they've negligible intermolecular force of attraction between the particles of the gas. So, they all are free to roam seperately and hence making a negligible volume for which they become heavy settle down.

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2 years ago

Is it easier to identify an unknown metal by such as physical properties as colour, lustre, mass, and volume, or by characterist

grandymaker [24]

The physical properties of a metal depend on how dense the metal is

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3 years ago

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Carbon dioxide is released in________and taken in by plants in ______

alex41 [277]

Answer: A

Explanation:

Plants take in sunlight, water, carbon dioxide. The produce sugar (glucose) and other things. It could not be deforestation. It can't be evaporation, that is from the water cycle. It cant be C due to it talking about precipitation, which is also from the water cycle. Therefore, it can only be A

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3 years ago