Gabriella weighs 450 N. She climbs a flight of stairs to a height of 3 m. It takes her 5 seconds. How much work does Gabriella do when she climbs the stairs?

A.

150 J

B.

270 J

C.

1350 J

D.

2250 J

Which branch of chemistry involves carbon-based molecules?

Ex1. how many moles correspond to 250 g of each of the following compounds? a. NaCl b. KNO, c. H, 0, d. KHSO, Ex2. Calculate how many particles are contained in: a. 1.5 g of potassium, K b. 0.470 g of oxygen, 0, c. 0.

1. What determines the reactivity of an atom?

A mixture of He, He, Ne, Ne, and Ar Ar has a pressure of 18.8 atm 18.8 atm at 28.0 °C. If the partial pressure of He He is 2.94 atm 2.94 atm and the partial pressure of Ar Ar is 4.27 atm, 4.27 atm, what is the partial pressure of Ne? Ne?

What increases from left to right on the periodic table

Which of the following elements is the most stable element? argon, manganese, phosphorus, robidium

List results of Chemical Reactions.

When you measure something in meters cubed, you are measuring

Low density: low pressure: high density Is which. evaporation? water vapor? condensation / liquid water

Which structures are found on sponges? pores medusae polyps stinging cells