Vocabulary
A combination of two or more substances that are not chemically combined?
Mixture
A liquid placed on blue litmus paper turns it red. What is true about this?
The liquid is an acid.
Name two substances/things that could be a base.
Milk
Baking Soda
What is a common use for salt?
roadway de-icer or seasoning food
How is hydrochloric acid important to maintaining the health of the human body?
It breaks down food so the body can obtain nutrients.
This can be a solid, liquid, or gas. The __________ is the substance that is being dissolved in a solution.
Solute
Give an example of an acid.
lemons
tomato
vinegar
What is the physical property of a base?
slippery
bitter to taste
conduct an electric current
Which substance forms during a neutralization reaction?
Salt
How is acid rain formed?
From burning fossil fuels that release sulfur oxides and nitrogen oxide, they combine with water to produce sulfuric acid and nitric acid. These acids in the atmosphere form acid rain when they dissolve in precipitation such as raindrops.
The ____________ is the substance in the solution that does the dissolving.
Solvent
Name two common uses for acids in our everyday life
Vinegar preserves food
lemon- for making or baking food.
tomato- food
What are some chemical properties of bases?
Bases can be caustic and may burn or corrode substances. Most indicators change color when in contact with a base compared to an acid.
What is a solution tha has a relatively low amount of solute called?
Dilute
Give an example how acid rain may affect a living organism.
Vegetation life
Ecosystem
Fish can be affected by the raising of the ph levels in lake, streams, or ponds.
States that matter is neither created nor destroyed in ordinary physical and chemical changes.
Law of Conservation of Mass
What are some chemical properties of acids?
Acids are corrosive, which means they can react with and destroy body tissue, clothing, and other things. They react violently with metals.
If a substance that is a chemical compound is used as an indicator of acid in a solution that is pink in the presence of a base is injected into a lemon, but the lemon is cut open and there is no pink present. What must have happened?
The acid in the lemon neutralized the base.
What is an example of an endothermic reaction? (absorbs heat from its surroundings)
cake baking
Photosynthesis
List three ways pH is measured.
Acid-base indicators
Universal pH papers
electronic pH meter
Increases the number of positively charged H2O ions when dissolved in water.
Acid
Acids increase ____________ions present in water?
Hydronium
Bases increase ____________ ions in the present in water.
Hydroxide Ions.
A student adds 5.00 g of salt to a .250 L of water. What is the concentration of the resulting solution?
Concentration= (Mass of solute) / (Volume of solution)
20.00g/L
If an acidic solution undergos a 100 fold DECREASE in hydronium ion concentration. How would the change be represented on the pH scale?
about 2-4