Answer:
Zinc reacts with dilute sulphuric acid to produce hydrogen gas (H2) and zinc sulphate. This is an example of displacement reaction of a non-metal by a metal. ... ZnSO4 is different in chemical composition and chemical properties than Zn and H2SO4 so it is a chemical change.
The basic unit of a chemical element.
atoms as a source of nuclear energy
The correct answer is C. Because sunlight hits the Earth's surface at a greater angle near the equator.
A chemical formula shows the atoms and their respective quantity in a compound or molecule. The chemical formula CO2 reads as carbon, one atom, oxygen, two atoms. Another example is H2O (water).
Answer:
You find the molar mass of calcium metal, it is listed as 40.1⋅g⋅mol−1 . You should check your copy of the Periodic Table to see if I have got it right. This means that Avogadro's number of calcium atoms, i.e. 6.022×1023 individual calcium atoms have a mass of 40.1⋅g .
Explanation: