A1)how many units of electricity was used if the previous meter reading was 45678 and the new reading was 50001 a2) the next trading was 50451 how many units were used this time?

b) what will be the cost of the electricity in each case assuming it costs 15p per unit?

c) how do you think the reading will change for: (i) the winter (ii) the summer? why do you think this?

if someone could awnser one of these you’ll be an absolute life saver

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

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?