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Is copper wire a mechanical mixture?
It should be a "pure" substance, but its really an alloy.
Why does one of the reactant copper carbonate is added in excess when preparing a sample of copper sulphate crystals?
Excess copper carbonate is added to ensure that all the copper sulphate is fully converted. This helps to make sure that all the starting material is used up and that the reaction goes to completion, resulting in a higher yield of pure copper sulphate crystals.
What is a pure substance - all the atoms have the same atomic number or number of protons?
A pure substance in which all the atoms have the same atomic number or number of protons is an element.
Is copper only made up of certain types of atoms?
Correct. Copper is made only of atoms that contain 29 protons in the nucleus.
Is copper a heterogeneous mixture or homogeneous mixture?
Neither. Copper is not a mixture at all. It is a pure element.
In a sample of pure copper all atoms have the same what?
All atoms have atomic numbers which are the same and the atoms have the same number of electrons.
What is a pure sample of atoms that are all the same known as?
a element is a pure substance
Is copper wire a mechanical mixture?
It should be a "pure" substance, but its really an alloy.
How does copper oxide reacting with hydrogen to form copper and water involve oxidation?
In this reaction, the copper ions in copper oxide are reduced to copper atoms, and the hydrogen atoms in elemental hydrogen are oxidized from the zero oxidation state characteristic of all pure elements to the +1 oxidation state of hydrogen atoms bound into water molecules.
Does copper have atoms?
Yes, all matter contains atoms.
Why does one of the reactant copper carbonate is added in excess when preparing a sample of copper sulphate crystals?
Excess copper carbonate is added to ensure that all the copper sulphate is fully converted. This helps to make sure that all the starting material is used up and that the reaction goes to completion, resulting in a higher yield of pure copper sulphate crystals.
Are all sample of elements are composed of atoms with same atomic mass?
No, different samples of an element can have varying atomic masses due to the presence of isotopes. Isotopes are atoms of the same element with different numbers of neutrons, leading to different atomic masses.
What is a pure substance - all the atoms have the same atomic number or number of protons?
A pure substance in which all the atoms have the same atomic number or number of protons is an element.
Are gold and copper both made of atoms?
Yes, all elements are made of atoms.
How can you use Dalton's atomic theory to explain why every sample of pure substance has the same properties?
Dalton's atomic theory states that elements consist of indivisible particles called atoms and that atoms of the same element are identical in size, mass, and properties. Therefore, every sample of a pure substance will have the same properties because each sample is made up of the same type of atoms arranged in the same way.
Is copper only made up of certain types of atoms?
Correct. Copper is made only of atoms that contain 29 protons in the nucleus.
Is copper conduct electricity a chemical change or a physical change?
It's neither since the copper isn't changing at all. Electrons are just flowing through the copper atoms.
