What can the coefficients in a balanced equation represent?
Coefficients are used in all chemical equations to show the relative amounts of each substance present. This amount can represent either the relative number of molecules, or the relative number of moles (described below). If no coefficient is shown, a one (1) is assumed.
What do the coefficients in a balanced equation tell us?
The coefficients of a balanced chemical equation tell us the relative number of moles of reactants and products. All stoichiometric calculations begin with a balanced equation. This is the reactant that is completely used in the reaction. The amount of limiting reactant determines the amount of product that is formed.
How many atoms are in 4Ca3 po42?
Verify that in 4Ca3(PO4)2 there are 32 oxygen atoms present.
What does the arrow in chemical equation mean?
An arrow points from the reactants to the products to indicate the direction of the reaction: reactants → products. When appropriate, a symbol may be written above or below the arrow to indicate some special circumstance. The symbol “Δ” is often used to indicate that the reaction is to be heated.
Which is not an indicator of a chemical reaction?
The choice that is not an indicator of a chemical change is “State of matter changes”. Along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid).
What is the best indicator of a chemical change?
Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Is diluting an acid a chemical change?
During dilution, the amounts of an acid or base in solution do not change- it is the volume of the solution that increases- so that the concentration decreases. The pH increases when a solution of an acid is diluted.