How would one know if something is an element?

En que se equvoco adrew

We know that the law of conservation of energy states that energy can not be created or destroyed. It only changes form. Consider this energy transformation diagram.

To what temperature must 25 liters of gas be raised to double its volume if the initial temperature of the gas is 300 K?

An unknown metal displaces aluminum (Al) from solution but does not displace sodium (Na). Using the activity series, determine the unknown metal.

What force (in newtons) is required to accelerate a body with a mass of 32 kilograms at a rate of 12 m/s2? If a body with a mass of 4 kg is moved by a force of 20 N, what is the rate of its acceleration?

What are small round structures in the cell that breaks down large food particles into smaller ones

A balloon has a volume of 2.5 L and contains 0.100 moles of Helium. Another balloon has a volume of 5.0 L. They are at the same temperature and pressure. How many moles of gas does the second balloon contain?

Why is it important to that the solid be dry before the final mass measurement?

What is 0.00055030 in Scientific form?

What happened to the rate of the forward reaction and the rate of the reverse reaction as time progresses. Describe the rates when the reacion reaches equilibrum.