In this redox reaction, identify the reducing agent.2MgO → 2Mg + O2

A.
H2O

B.
Mg

C.
MgO

D.
O

Final answer:

The jumbled letters 'acnsrl spgei' can be arranged to make 'Spring Scale', which is a physics tool used for measuring the weight or force exerted by an object.

Explanation:

The jumbled letters 'acnsrl spgei' can be rearranged to form the term'Spring Scale'. A Spring Scale is a tool used in Physics to measure the weight or force exerted by an object. It utilizes Hooke's Law, which states that the force exerted on a spring is directly proportional to the amount it is stretched or compressed. Thus, when you hang an object on a spring scale, the spring stretches, and the amount of stretch can be calibrated to the force or 'weight' of the object. In real-life uses, you may see it in a grocery store for weighing produce for example.

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Answer: A. the transfer of heat by currents

Explanation: There are three modes of heat transfer:

1) Conduction: This type of heat transfer happens when there is direct contact between the two object.  Example: heating a pan on stove.

2) Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.

3) Radiation: This type of heat transfer happens when there is direct transfer of energy through space. Example: Heating of earth's surface.

B. The transmission of heat across matter is conduction.

C. The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation.

D. The transmission of heat across empty space is radiation.

Answer:

A: The transfer of heat by currents.

Explanation:

Convection is the transfer of heat by currents, typically within a liquid or a gas. When heat is transferred by convection, matter flows.

Explanation:

When we move across a period then there occurs an increase in the number of electrons of atoms from left to right. These electrons are added to the same sub-shell.

For example, elements present in row 2 will have electrons present in n = 2 which is the highest energy level for row 2 elements.

Hence, there are different number of valence electrons present in the elements of a row.

Whereas when we move down a group then elements have same number of valence electrons. As a result, they tend to show similar chemical properties.

But since, there are no same number of valence electrons in the elements of a row. Hence, they do not show similar chemical properties. Therefore, elements of a row do not behave same in chemical reactions.

Thus, we can conclude that we disagree with the hypothesis given by the student.