ELEMENTS, COMPOUNDS & MIXTURES ☕
A substance made of only one type of atom.
What is an element?
the attraction of one water molecule to another type of molecule.
What is adhesion?
True or False: A substance with a pH of 6 is more basic than a substance with a pH of 9 because 6 is closer to 7
What is False.
Anything with a pH less than 7 is acidiic.
The equation for the reaction of calcium (Ca) and oxygen (O₂) to produce calcium oxide (CaO) is shown below.
2Ca + O₂ → 2CaO
If 80 g of calcium reacts with 32 g of oxygen, what is the mass of calcium oxide produced?
What is 112 grams?
A student has three beakers containing different solutions.
Beaker 1 pH=3
Beaker 2 pH=7
Beaker 3 pH=11
The student accidentally spills some of Beaker 1 into Beaker 3.
Which statement best describes what could happen to the pH of Beaker 3?
What is Its pH could decrease because an acidic solution was added.
Soda with Ice
What is a heterogenous mixture?
The surface of water resists external forces. This describes which property of water?
What is surface tension?
Name two things that acids and bases have in common.
What is they are corrosive and they neutralize each other
Photosynthesis is the process by which green plants use carbon dioxide and water to make nutrients. The chemical equation for photosynthesis is shown.
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2
How many oxygen atoms are in this reaction?
What is 18 Oxygen atoms
What is the difference between a compound and a mixture?
What is a compound is chemically bonded and has a fixed composition, while a mixture is physically combined and its substances retain their properties.
Black coffee
What is a homogenous mixture?
What property of water causes water to form the shape of droplets?
what is Cohesion?
A student measures the pH of a solution before and after adding a substance.
Initial pH =5
Final pH= 8
Explain what happened to the substance.
WHat is the substance bacame more basic.
Two solutions are mixed and react to produce a solid precipitate. The balanced equation is:
CaCl₂ + Na₂CO₃ → CaCO₃ + 2NaCl
What happens to the total mass as the reaction takes place?
What is the mass remains constant or the same.
Explain why a chemical reaction does not violate conservation of mass.
What is because mass is always conserved during a chemical reaction. No atoms are lost or gained. They only rearrange.
Sugar
What is a compound?
Explain how adhesion and cohesion help with capillary action
What is water molecules adhere to the wall of the xylem and cohesive forces attract the water mol.ecules to each other following them up the xylem
A student measures the pH of four liquids.
List these substances from most acidic to most basic.
What is Vinegar, Orange juice, baking soda, Soap solution.
A student models both sides of the following chemical reaction using four colors of beads.
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
She uses 4 blue beads, 4 green beads, 4 yellow beads, and 4 white beads.
Which beads represent each element?
What is
A chemical reaction has the following masses:
A + B → C
What is the mass of C?
What is 65 grams?
You add sand to water and shake the container. What have you made?
What is Heterogeneous mixture
A student places a small drop of water on a clean penny. The student is able to add several more drops before the water spills over the edge of the penny. The water forms a rounded, dome-like shape on the surface of the penny.
Which property of water best explains this observation?
Cohesion, because water molecules are attracted to one another
What is another word for basic?
What is Alkaline?
A student measures the mass of a tarnished copper coin and 50 mL of a saltwater solution. The student places the coin in a pan lined with aluminum foil, adds the saltwater solution, and stirs it. After 30 minutes, the coin appears shiny and new. The student observes small flakes of material at the bottom of the pan.
What is the student MOST LIKELY to discover about the mass of the coin and solution after the coin is removed from the pan?
What is the coin's mass will decrease and the solutions mass will increase since some of the tarnish came off of the ring and into the solution. THE TOTAL MASS OF THE COIN AND THE SOLUTION WILL REMAIN THE SAME.
Which property helps water move through the tiny tubes in a plant?
What is Capillary action, which involves both adhesion and cohesion.