Presentation on theme: "PH Questions a. What do the formulas, arrow, and plus signs in a chemical equation tell you? The formulas tell you the elements and compounds involved."— Presentation transcript:
1 PH Questionsa. What do the formulas, arrow, and plus signs in a chemical equation tell you?The formulas tell you the elements and compounds involved in the reaction, the arrow means “yields” and points to the products, and the plus signs indicate two or more reactants or productsb. How are reactants and products treated the same in a chemical reaction? How are they treated differently?Both reactants and products are written as formulas. Reactants are placed to the left of the reaction arrow, whereas products are placed to the right side of the reaction arrow.
2 a. How does the idea of atoms explain the principle of conservation of matter? In a chemical reaction, the number of atoms stays the same. This shows that matter is not created or destroyed during a chemical reaction.b. If the total mass of the products of a reaction is 250 g, what was the total mass of the reactants?250 g
4 Title: Water Pollution Activity 34Title: Water Pollution
5 Read C-21 Problem: What are some sources and types of water pollution? Hypothesis/Initial Thoughts:
6 What do you think of when you hear the term water contamination? Caused by various substances in the water.Could the contamination be dangerous to people’s health?Water-borne disease: a disease carried by water.
7 Read pgs. C-22 to C-27Answer the stopping to think questions on paper.Fill in the blanks on the concept map as you readBegin analysis questions 1-4Answer the conclusion question
8 Stopping to Think 1What are the main types of biological contamination, and what are their sources?Human sewage containing cholera (not common today)Animal waste containing E. coli or Cryptosporidium from farms, pets, and meatpacking plants.Giardia can be found living naturally in rivers.The waste in water can contaminate food sources or enter the water supply in storm water.
9 Stopping to Think 2What are some of the ways chemical contamination can get into the water supply?Fertilizers and chemicals used to kill weeds and pests on farms and lawns, gas, oil.Antifreeze from vehicles, copper from industry and copper water pipes, and acid and metals from mining waste.
10 Stopping to Think 3What is it about water that makes water contamination such a big concern?Water travels easily and is hard to contain.Water is everywhere in the environment.Water is widely used and necessary for life.
11 Concept Map Water Pollution Storm Sewers Direct Water Pollution enters water bycan be categorized asDirect Water PollutionOil, gasoline, antifreezeChemical ContaminationBiological Contaminationcan beLakes/riverscan beproduced bymay containFertilizerVehiclescan beAnimal droppings (pets or wildcan beGiardiaproduced byAcidsHeavy metalsFarms, GardensHuman sewageAnimal waste from farmsproduced bycontainMinessuch asBacteriacontainscontainscontainsCopperLeadE. coliCryptosporidiumBacteria that causes Cholerareleased byreleased bycan contaminateCorroded Water PipesVegetables and Crops