Average speed is 72.5
5 hours x72.5=362.5 and add 1 /4 of
72.5=18.12 . 362.5+18.12=380.62
Answer:
D. A chemical reaction
Explanation:
The evolution of a gas and the formation of a new solid with different properties are signs that the original materials have changed into something else.
They have been in a <em>chemical reaction</em>.
A is <em>wrong</em>. Evaporation is a physical change in which the molecules of the liquid move into the gas phase.
B is <em>wrong</em>. Photosynthesis is the use of sunlight by a plant to convert carbon dioxide and water into glucose.
C is <em>wrong.</em> A physical change does not involve a change to another substance with new chemical properties.
Because if they are not balanced, then the amount of reaction is not equal to the amount of the product. You must have the same ratio of atoms on both sides of the equation because we are not losing moles of each element.
Answer: a
Explanation: because an Arrhenius acid is a compound that increases the H + ion concentration in aqueous solution. An Arrhenius base is a compound that increases the OH − ion concentration in aqueous solution.