After reading a book about parrots, Tani wants to learn more about them. Which question could be answered through scientific investigation?A. Which bird’s eggs taste the best?
B. What substances make up an eggshell?
C. Which birds have the most beautiful feathers?
D. Which type of bird makes the best pet in an apartment?

Answer: Option (3) is the correct answer.

Explanation:

One of the important factor on which rate of reaction depends is surface area. That is, when a compound is crushed into powdered form then there will be increase in surface area of the compound.

Hence, now more number of particles can interact, therefore, there will be increase in rate of reaction.

Thus, we can conclude that reaction occurs more quickly when powdered iron is used instead of a single piece of iron of the same mass because the powdered iron has a greater surface area than the single piece of iron.

The aspects of Dobereiner’s triads that agreed with the modern table where elements were arranged together with similar properties, and the aspects that did not match were the periodic table arranged in the rising of their atomic number.

What were Dobereiner’s triads?

Dobereiner’s triads were the arrangement of chemical elements on the basis of their similar physical and chemical properties, this was called the old periodic table. It was given by German chemist Johan Wolfgang Dobereiner.

The modern periodic table is arranged on the basis of their atomic number The elements of Dobereiner's triads were placed based on the order of increasing atomic masses.

Thus, All known elements could not be grouped into triad groups based on their properties.

To learn more about Dobereiner’s triads, refer to the below link:

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Answer:

In  Dobereiner’s triads, elements were placed :

• According to increasing order of their atomic masses.
• Into groups which have similar chemical and physical properties.
• In each group there were three elements.

In Modern periodic table, elements are placed:

• According to increasing order of their atomic numbers.
• Into groups and these groups are assigned according to the numbers of valence electrons present in their valence shell.

Aspects of Dobereiner’s triads agreed with the modern periodic table

• Element of the same group will have similar chemical and physical properties.

Disagreement with the modern periodic table.

• Not all groups obeyed law of triads.
• On the basis of properties all known elements could not be classified into groups of triads.

Answer: 8.25 moles of oxygen are produced.

Explanation: The reaction follows:

By Stoichiometry,

As, 4 moles of Aluminium is produced by 2 moles of aluminium oxide

11 moles of aluminium will be produced by =

Now, 2 moles of aluminium oxide produces 3 moles of oxygen, so

5.5 moles of Aluminium oxide will produce =

Hence, 8.25 moles of oxygen will be produced.

The statement about “Upwelling is a process in which warm, nutrient rich water from the deep ocean rises to the surface” is false. It must be the cold, nutrient rich water from the deep ocean that must rise to the surface and replaces warm surface water. The cause of upwelling is when the local wind patterns blow along the northwest coast of South America causing local surface currents to move away. The warm water is then replaced by the deep cold water

Answer:

false

Explanation: