Chemistry High School

Which of the following would be evidence of a
chemical change? Boiling or Burning

Answers

Answer 1

Evidence of a chemical change will be Burning.

Changes are either classified as physical or chemical changes. Chemists learn a lot about the nature of matter by studying the changes that matter can undergo.

A change can be physical if no ties are made or broken. They entail rearranging molecules but do not alter them.

A few examples of physical changes are:. shifts in state (changes from a solid to a liquid or a gas and vice versa).

When bonds between molecules or atoms are created, disrupted, or both, chemical changes result. This implies that a substance with a particular set of properties—such as melting point, color, flavor, etc.—becomes a substance with a different set of characteristics.

The burning of paper and cloth involves both a physical and a chemical change, which can be reversed more easily than the boiling or heating of water. If water is boiled for more time it changes from a chemical state to a vapor state, which is a physical change.

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Related Questions

for a particular isomer of c8h18, the combustion reaction produces 5108.7 kj of heat per mole of c8h18(g) consumed, under standard conditions. c8h18(g) 252o2(g)⟶8co2(g) 9h2o(g)δH∘rxn

Answers

The enthalpy of formation of the compound is -230.3 kJ/mol.

What is the heat of formation?

We know that the heat of formation of a substance can be obtained from the equation; [tex]C_{8} H_{18} (g)+\frac{25}{2} O_{2} (g)-------- > 8CO_{2}(g)+9 H_{2}O[/tex](g)ΔH∘rxn=−5093.7 kJ/mol by the use of the Hess law.

Let us now obtain the heats of formation of each of the species in the reaction as we can see them from the species in the reaction equation;

[tex]CO_{2}[/tex](g) = -393.5 kJ/mol

[tex]H_{2} O[/tex](g) = -241.82 kJ/mol

[tex]O_{2}[/tex](g) = 0 kJ/mol

The enthalpy of formation of the compound is now;

8(-393.5) + 9( -241.82) + 5093.7

= -3148 -2176 + 5093.7

= -230.3 kJ/mol

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What are some positive and negative economic, social, political and environmental impacts related to the mining, use or disposal of copper?

Answers

including prospecting, exploration, construction, operation, maintenance, expansion, abandonment, decommissioning and repurposing of a mine can impact social and environmental systems
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