Tools that make human work easier?

What percentage of the total net electricity generated in America each day is represented by coal?

Consider just the first sentence of this multistep word problem. Sentence 1: The sum of the ages of a brother and sister is 26. Give an equation that represents this statement using b as the age of the brother and s as the age of the sister.

Temperature has no effect on matter. A True B False

What type of energy is used to power up the lite bulb? When the light bulb turns on, energy is being converted into what forms? How do you know? What happens when you increase the voltage of the battery?

In a student experiment, a constant-volume gas thermometer is calibrated in dry ice (278.58c) and in boiling ethyl alcohol (78.08c). the separate pressures are 0.900 atm and 1.635 atm.

How many grams of NaOH are produced with the reaction of 5.00 moles of water?

Describe the physical properties of water

Which element has the same number of valence electrons as oxygen--. a. Neon-b. Nitrogen-c. Sulfur-d. Fluorine

Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?

Which piece of glassware is best suited for making accurate dilutions?