Lessons 4-5 Flashcards
What is specific heat?
The amount of energy required to raise on gram of water 1 degree Celsius.
What is adhesion.
How well a substance sticks to their substances.
What does it mean to be solvent to a substance?
To be solvent to something means to be able to dissolve in that liquid.
What is the universal solvent?
water
What is a molecule?
A molecule is formed when two or more atoms join together chemically.
What is a Chemical Bond?
Chemical Reactions occur when chemical bonds break or when new bonds form. Chemical bonds form when reacting atoms come in contact with another.
What is the Chemical Formula?
- Identifies the elements in a compound and the ratio of atoms that make up that substance.
- A formula does NOT count how many atoms of each element are present, but rather the PROPORTION of atoms present.
What is a Chemical Reaction?
A molecule that contains at least two different elements.
What is a subscript?
A subscript shows the number of atoms of an element in a molecule or the ratio of elements in a compound.
What is a chemical equations?
A shorter, easier way to show chemical reactions using symbols instead of words.
What are Reactants?
The materials at the beginning of a chemical equation (the substances you start with).
What are Product(s)?
Products are the materials at the end of a chemical equation (what you end up with or what is produced after the reaction).
What is the Law of Conservation of Matter?
Matter is not created or destroyed during a chemical reaction.
What is the law of Conservation of Mass?
The total mass of the reactants must equal the total mass of the products.
What is Chemical Change?
A change in matter that produces NEW substances.
Examples : burning of wood, iron rusting, etc.
What is a Physical Change?
A change that alters the form or appearance of a substance but does not make the material into a different substance.
Examples : chopping wood, bending copper, freezing water, etc.
What is the Balanced Chemical Equation?
No matter how many reactants and products are involved, all atoms present at the start of the reaction are present at the end.
What is Cohesion?
When atoms of the same element stick together.
What is High Surface Tension?
The force exerted along the surface of a liquid that causes it to “bend up” and form into drops. Water has a high surface tension and bends up easily while alcohol does not.
Is water’s specific heat higher of lower than other substances?
Higher, 4.18 jewels to be exact.
What is Run-Off?
Water that doesn’t absorb easily.
What source of energy drives the water cycle?
Sun
What is Transpiration?
Transpiration happened when water evaporates from living things such as trees and humans (when we sweat).
What is a Bond?
When one elements combined with another element. To do this the atom would have to be either negatively or positively charged and have an uneven amount of electrons. The atom would then give or take a electron from a different atom to bond.
