Answer:
The answer for number one is .A
The answer for number two is heat rises
Explanation:
Answer:
Option A an E.
Explanation:
Energy can be described as the capability to do work. It is what has to be transferred to an object in order to get this object to do work. Energy can be in various forms such as heat energy, kinetic, potential, electrical, chemical, nuclear etc.
It takes energy to do quite a number of things, from cooking food to driving and also in engaging in exercises.
Answer:
H2SO4(aq) + MgO(s) → H2O(l) + MgSO4(aq)
Explanation:
We must recall that the oxides of metals are bases. These metal oxides can react with dilute acids to yield salt and water.
Bearing that in mind, we want to obtain magnesium sulfate from a metal oxide and dilute acid.
In this case we need magnesium oxide and dilute sulphuric acid. The reaction occurs as follows;
H2SO4(aq) + MgO(s) → H2O(l) + MgSO4(aq)
Answer:
Dalton's atomic theory states that atoms are indivisible. This has been proven through observation to be false: atoms can be divided into protons, neutrons and electrons. Dalton's theory also states that all atoms of an element are identical. This is also false because we know isotopes exist, and while they are still of the same element, they have different numbers of neutrons in their atomic nucleus.
It must have 12 electrons. The negative charge must equal a positive charge since the element has not been specified to be an ion. The reason atomic masses are usually decimal numbers is because electrons actually do contribute to the mass except in a very small amount. That amount is reflected by the decimal numbers you'll see in the atomic mass of an element.
I hope this helps!
