Types of Mixture
What is an example of a MIXTURE involving a solid and a liquid?
Rocks and Water
How does water interact with solids?
Water can dissolve certain solids.
What does it mean for a solution to be acidic?
It has a pH value less than 7.
What gas causes global warming and can be produced when we mix vinegar and baking soda?
CO2
What procedure can be used for making a crystal?
Evaporation of a solution containing dissolved solids. Usually a supersaturated solution.
Can you name a technique for separating different materials in a mixture?
filtration, distillation, or evaporation.
What distinctive properties does the surface of water have?
Surface tension and cohesion.
What is an indicator used for in chemistry?
To identify whether a solution is acidic or basic.
How can you recognize evidence of a chemical reaction?
Formation of gas, color change, temperature change, or formation of a precipitate.
What is the first step in the scientific method?
Question
Define the terms "solvent" and "solute."
Solvent is the substance in which a solute dissolves to form a solution, while solute is the substance that dissolves in a solvent.
How does a solution differ from other types of mixtures?
Solutions are homogeneous mixtures where solute particles are evenly distributed throughout the solvent, unlike heterogeneous mixtures where components are unevenly distributed.
A substance has a pH of 7.4 what is it?
Basic
Explain how the products of a chemical reaction differ from the original substances.
The products have different chemical properties from the original substances.
What is a hypothesis?
A testable prediction or explanation based on observations and prior knowledge.
What term describes a solution that contains more solute than it can normally dissolve at a given temperature?
Supersaturated solution.
What happens when a solid material dissolves in water?
The solid particles disperse throughout the water to form a solution.
I can be used to clean teeth, I have a pH of 10, and I am not sour. What am I?
Basic - toothpaste
What is an example of an irreversible change of materials?
Formation of a new substance in a chemical reaction.
What is a control group in an experiment?
The group that does not receive the experimental treatment and is used as a baseline for comparison.
Imagine you're in a chemistry lab conducting an experiment. You're given two containers labeled A and B. Container A contains a clear solution, while container B contains a mixture that appears to have different substances visibly separated. Explain the difference between the contents of containers A and B in terms of homogeneous and heterogeneous mixtures.
Container A contains a homogeneous mixture where the components are uniformly distributed throughout the solution. This means that the substances in container A are evenly mixed at the molecular level, resulting in a uniform appearance with no visible separation. On the other hand, container B contains a heterogeneous mixture where the components are not evenly distributed and can be visibly distinguished. This indicates that the substances in container B are not uniformly mixed, resulting in regions with different compositions or phases within the mixture.
You're in a chemistry lab. You've dissolved a solid in a liquid to form a solution. How would you separate and recover the solid from the liquid?
Evaporation
Bob guesses that substance A is a base what colour litmus paper would Bob use, what colour would the paper turn if substance A is a base?
he would use red litmus paper. If substance A is indeed a base, the red litmus paper would turn blue.
Is water freezing a chemical or physical change? And explain your reasoning.
Physical change. There is no new substances formed.
Billy wants to figure out if adding more salt to water causes it to freeze easily. What would be the manipulated variable? What would be the responding variable?
The amount of salt
How fast it freezes