Which of the following would most practically be studied by use of a model? The global movement of ocean water. The veins of a leaf. The parts that make up a can opener. The inside of a light bulb.

What happens to the particles in a substance during a ohysical change

A student made a copper bracelet by hammering a small copper bar into the desired shape. The bracelet has a mass of 30.1 grams and was at a temperature of 21°C in the classroom.

Liquid 1 reacts with Liquid 2, producing a solid and a gas. Using this scenario, which supports the law of conse mass?

Which of the following aqueous solutions will have the lowest vapor pressure at 25°C? 1.0 M Fe (NO3) 3 2.0 M C6H12O6 1.0 M KNO3 2.0 M CaCl2

What is the electrical charge of an atom that has lost an electron

Which occurs more often on earth? Physical or Chemical changes?

The chemical symbol for the element calcium is Ca what would be the symbol representing the calcium atoms that has lost atoms that have lost two electrons

What is the molality of a solution containing 10.0 g of Na2SO4 dissolved in 1000.0 g of water?

A population of birds has nesting sites for 500 birds and food for 400 birds. What is the limiting factor for this population? Explain your answer.

A fish is swimming at a constant rate towards the ocean floor. The equation y=-7x-3 can be used to represent this situation, where y is the depth of the fish in meters below the sea level and x is the number of seconds the fish has been swimming.