Chemical reactions always produce explosions yes or no

What is the percentage composition of carbon in the compound ch4

What is a difference between a mixture of elements and a mixture of compounds

While in europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car’s gas mileage is 32.0 mi/gal? assume that 1 euro=1.26 dollars