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Questions in chemistry

[Open]What is the sum of 0.04321 g + 5.263 g + 2.13 g to the correct number of significant digits?

[Open]What element is a white, shiny, metallic solid that reacts slightly to air and has a density of 1.55?

[Open]Methane, CH4, can be used as fuel in an automobile to reduce pollution. What is the coefficient of oxygen in the balanced equation for the reaction? __CH4(g) + __O2(g) → __CO2(g) + __H2O(g)

[Open]Given that P-31 is the only natural isotope of phosphorus, what is the mass of one phosphorus atom and the mass of Avogadro's number of phosphorus atoms, respectively?

[Open]List three ways you can use an electric current. Describe the energy change that takes place.

[Open]What element has atoms that can form halide ions?

[Open]Why did the heat-treated enzyme behave differently than the non-heated enzyme?

[Open]Why don't all the Group 1 metal carbonates decompose in the lab?

[Open]What is the difference between gymnosperms and angiosperms?

[Open]How many molecules of water are there in a 5.00 g sample of water?