(a) Matter cannot be created and destroyed by a chemical reaction.
Explanation:
(a) Matter cannot be created and destroyed by a chemical reaction. (correct)
The number and type of atoms entering the chemical reaction are the same with the number and type of atoms leaving the chemical reaction.
(b) The reactants are the same substance as the products. (wrong)
You may see in the reaction that we have as reactants zinc and hydrochloric acid which react to form the products, zinc chloride and hydrogen.
(c) The number of molecules in the reactants are equal to the number of molecules in the products. (wrong)
As reactants we have 2 hydrochloric acid (HCl) molecules and as products 1 hydrogen (H₂) molecule. Zn is a metal and ZnCl is a salt.
(d) The atoms on the reactants side are changed into different atoms on the products side. (wrong)
The number and type of atoms entering the chemical reaction are the same with the number and type of atoms leaving the chemical reaction.
Learn more about:
balancing chemical equations
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Both designed a periodic table of elements- Mendeleev designed the first one in order of atomic mass and Moseley designed the modern one in order of atomic number. ... Isotope- Because of the notation and the 13 is not the atomic mass on the periodic table so it is the same element just a different form.
Answer:
(4) All atoms of a given element must have the same atomic number
Explanation:
Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.
However, when we talk about the atomic number of the ion, it is not equal to the number of electrons as electron can be gained or loosed.
This is why, more appropriately, the number of the protons which are present in the nucleus of the atom is called the atomic number.
Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.
Mass number = Number of protons + Number of neutrons
<u>Thus, atomic number of an element is an unique property of the element and it's atom.</u>
