Which of the following is considered an ignition source?

A: all answer choices are source of ignition

B: Cutting and welding

C: Lightning

D: Open flames

An exothermic reaction releases 13,450J of heat. How many calories of energy are released? A) 5 56,274 calories B) 1,244 caloriesC) 134,500 caloriesD) 3,215 calories

A group of college students believes that herbal tea has remarkable restorative powers. To test their belief, they visit a local nursing home, visiting with and talking to the residents while serving them herbal tea.

Magnesium has three naturally occurring isotopes with masses of 23.99 amu, 24.99 amu, and 25.98 amu and natural abundances of 78.99%, 10.00%, and 11.01%, respectively. Calculate the atomic mass of magnesium

An alkyne with molecular formula C4H6 was treated with ozone followed by water to produce a carboxylic acid and carbon dioxide. Draw the expected product when the alkyne is treated with aqueous acid in the presence of mercuric sulfate.

What is the pH of H3O + = 2.4 (10^-3) M? A.) 3 B.) 2.6 C.) 5.4 D.) - 3

If you change the state of something, say, liquid to solid, is it a physical or chemical change?

What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum