Which of the following is true for combustion reactions?

Energy is absorbed.

Energy is released.

Hydrogen is a reactant.

Nitrogen is a reactant.

José and Laurel measured the length of a stick's shadow during the day. Without knowing the length of the stick, which of their measurements would you ask José and Laurel to examine more closely?

Which statement describes a strong acid? A. A strong acid is a substance that completely dissociates in water to produce an aqueous solution of H3O + and conjugate base ions. B.

What is the difference between Alkane and alkene.

Nonmetals are excellent conductors of heat and electricity. a. True b. False

What is the molar mass of sodium nitrate, NaNO3?

Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars.

How long does a hydrogen bond last in water

If the body temperature of a person is recorded as 37°c, what is the person's body temperature in k? round your answer to the nearest whole number.

Pf3cl2 is a nonpolar molecule. based on this information, determine the f-p-f bond angle, the cl-p-cl bond angle, and the f-p-cl bond angle. enter the number of degrees of the f-p-f, cl-p-cl, and f-p-cl bond angles, separated by commas (e. g.

What is the empirical formula of a substance that contains 2.64g of C, 0.444g H and 3.52g of O