Atomic Basics
This tiny particle has a positive charge and is found in the nucleus of an atom.
What is a proton
Compared to the size of the whole atom, the nucleus is (small / same size / larger) and contains most of the mass.
What is small but contains most of the mass?
A chemical reaction happens when these are rearranged to form new substances.
What are atoms?
In a balanced chemical equation, the number of each type of atom on the reactant side must do this compared to the product side.
What is stay the same / be equal?
This particle has no charge it is neutral and is also found in the nucleus.
What is a neutron
In a neutral atom, the number of protons is equal to the number of these particles.
What are electrons?
In a chemical equation, the starting substances written on the left side of the arrow are called this.
What are reactants?
In the equation H₂ + O₂ → H₂O, there are 2 hydrogen atoms on the reactant side. How many hydrogen atoms must be on the product side to obey the Law of Conservation of Mass?
What is 2 hydrogen atoms?
This negatively charged particle moves around the nucleus in a cloud or region of space.
What is an electron
This term describes the number of protons in the nucleus of an atom and determines the element.
What is atomic number?
In a chemical equation, the new substances formed and written on the right side of the arrow are called this.
What are products?
When balancing equations, you can change these numbers in front of the chemical formulas, but you cannot change the small subscripts in the formulas.
What are coefficients?
The center of the atom that contains protons and neutrons is called this.
What is the necleus
These two particles have almost the same mass and are both found inside the nucleus.
What are protons and neutrons?
The Law of Conservation of Mass says that the total mass of the reactants must be (blank) to the total mass of the products.
What is equal?
In a closed system, no matter can enter or leave. What happens to the total mass during a chemical reaction in a closed system?
What is it stays the same?