Which of the following is a combustion reaction?

a 2H2O 2H2 + O2

b 2AgNO3 + H2S yields Ag2S + 2NHO3

c CH4 + 2O2 yields CO2 + 2H2O

d 2Al + N2 yields 2AlN

Is the degree of highness or lowness of sound

How big is the ocean of Spokane?

What pressure would have to be applied to a 27.2-mL sample of gas at 25 °C and 1.00 atm to compress its volume to 1.00 mL without a change in temperature?

How many grams are in 2.4 moles of NH4?

How many joules of heat is lost when a 64 g piece of copper cools from 375 oC to 26 oC? The specific heat of copper is 0.38 J/goC.

Andrea is performing an experiment in which she needs to know when a strong acid is present. She is not sure which indicator to use, so she looks up the following table in her science textbook. Indicator pH range thymol Blue 1.2 - 2.8 phenol Red 6.

Which represents the balanced nuclear equation for the beta plus decay of C-11? Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 5 upper B plus superscript 0 subscript plus 1 e.

Make a prediction for how to identify an unknown element and the chemical composition of a star

The density of HCN (hydrogen cyanide) gas at STP is 1.21g/L. What volume will 100.0g of HCN occupy at STP? A) 121 L B) 0.012 L C) 82.6 L D) none of the above

A 20.0 ml sample of 0.150 m ethylamine is titrated with 0.0981 m hcl. what is the ph after the addition of 5.0 ml of hcl? for ethylamine, pkb = 3.25