Which action best demonstrates the transformation of mechanical energy to heat energy to light energy?

A) Striking a matchstick

B) Squeezing a sponge ball

C) Rubbing hands together vigorously

D) Releasing a stretched spring

When a mixture of limestone and clay is heated in a rotary kiln cement is produced. Burning a mixture of methane and air heats the kiln. Carbon dioxide is one of the main gases give two reasons why.

The smallest particle of a substance that has the same properties as the substance is a molecule. True or false?

A kerosene stove is supposed to give a blue flame. what can be wrong if it is giving a yellow flame

In which state does the precipitate exist in a precipitation reaction?

Determine the energy of the electron in the 1s orbital of a helium ion (He+)

Which term best describes the type of bonding in magnesium chloride

This equation indicates that the reaction gives off heat. What is this type of reaction called? 2C4H10 + ? O2? 8CO2 + 10H2O + heat a. an exothermic reaction b. an endothermic reaction c. absorption reaction d. precipitation reaction

Given the balanced equation representing a reaction: C3H8 (g) + 5O2 (g) = = >3CO2 (g) + 4H2O (g) What is the total number of moles of O2 (g) required for the complete combustion of 1.5 moles of C3H8 (g) ? (1) 0.30 mol (3) 4.5 mol (2) 1.5 mol (4) 7.

What increases in equal steps of one from left to right in the Periodic Table for the elements lithium to neon?

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.