Atoms/Periodic table
Elements are organized in columns and rows on the periodic table. What are the other names given to columns and rows on the periodic table?
Rows = Periods
Columns = Groups
Bases are considered what in the pH scale?
Above 7
Production of a new substance with different properties than the original substance.
Chemical change
Mass cannot be created nor destroyed, only transformed.
Law of conservation of mass
An educated guess about the answer to a scientific question that can be tested to determine if the results support it or not.
Hypothesis
Where are metals located on the periodic table?
To the left and center.
Acids are considered what on the pH scale?
Below 7
A change in matter that does NOT alter it's chemical composition. There is no new substance being created.
Physical change
In a closed system, 200 grams of H2O are combined with 100 grams of H202. According to the Law of Conservation of Mass, what would be the mass of the product?
300g
What you should do when your hypothesis is NOT supported.
Report findings honestly and state that data did not support the hypothesis.
Why is an element considered a pure substance?
An element is contains only one type of atom
Salad dressing, chex mix, and sand are all considered what?
Mixtures
The water cycle involves the continuous movement of water on earth. Water is evaporated and forms clouds in the atmosphere then rain returns the water to the ground to support life. The water cycle is an example of what kind of change?
Physical change
You are carrying an enclosed box full of glass beakers with a mass of 100g. Your friend bumps into you, causing you to drop the box, shattering the beakers inside. What happens to the mass of the beakers inside the box?
Remains the same
When another scientist completes your experiment.
Replication
Label the element / molecule / compound
Fe
H2
H2O
Element = Fe
Molecule = H2 (H2O)
Compound = H2O
In an acid / base solution, what is the product?
Salt (and water)
A baker is making a loaf of bread. He needs to heat the bread up in the oven to ensure that the chemical reactions are occurring between the ingredients. This is what kind of change?
Chemical change
True or false: A chemical change can destroy the amount of mass in a substance
False (mass cannot be created nor destroyed)
When you run multiple trials of your own experiment
Repetition
Why can liquids change shape?
Particles in liquid move past each other.
Salt -> Water -> Salt water
Which is the solution, solvent, and solute?
Salt = Solute
Water = Solvent
Salt water = solution
How does temperature affect the rate of reaction in a chemical change?
The higher the temperature, the faster the rate of reaction
True or false: Chemical and physical changes of a substance cannot create or destroy its mass.
True
Susie wants to know what brand of cereal her family likes most. She buys three different brands of cereal and observes what her family consumes most of over a week period. What would be an example of repetition of this experiment?
Susie running the whole trial again the next week with no changes to the design.