PLEASE HELP WITH MY CHEMISTRY PLZ The carbon dioxide concentration in the atmosphere was 282 parts per million (ppm) in the year 1750.
In the year 2010, this increased to 387 ppm. Calculate the percentage increase in carbon dioxide
concentration over this period of time. Round your answer to the nearest whole number.

Which metal exist in liquid state and can be cut with knife ?

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

What type of energy conversion occurs when you place your feet near the fire place and they become warm