Select the type of energy involved in each step.

you turn on the burner of a gas stove. a) chemical b) thermal c) mechanical d) electrical

the gas ignites. a) chemical b) thermal c) mechanical d) electrical

the gas warms the water in the pan. a) chemical b) thermal c) mechanical d) electrical

Explanation:

1) When we turn on the burner of the gas stove, we use mechanical energy. Mechanical energy is energy due to motion of an object.

Correct is option (c).

2)The ignition of the gas is a chemical energy. Chemical energy is is a energy which releases during the chemical reaction. Here gas id reaction with air to get ignite.

Correct is option (a).

3) The warming of the water in the pan by the help of burning gas is thermal energy. The thermal energy is an energy due to motion of the molecules or particles which can be transferred from one object to another in form of heat. Here the heat transferred to the pan by the burning of gas warms the water.

Correct is option (b).

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.