A science teacher sets up a demonstration for her class. She turns on three electric hot plates. On each hot plate is a beaker of water. Between the hot plate and the beaker is a block of material: metal, granite, or glass. The blocks are all the same size. The water in the beaker
above the metal block boils first.
Why does the water in the beaker on the metal block boil first?
O A Metal lets out more heat than the other substances,
O B. Metal is a harder material than the other substances,
O c. Metal transfers heat faster than the other substances,
OD. Metal is better at reflecting heat than the other substances,

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?