Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work: W = Fd) 0.5 m 2 m 250 m 750 m'

Ling decided to do a science project on exercise. She wanted to find out how long it takes for a person's heart rate to slow down to normal after exercise. Which of the following was likely the scientific prediction Ling made about her project? A.

Which of the following elements have the highest electronegativity? a) F b) N c) Br d) Cs e) Al

What type of oxide is sulphur dioxide

Uranium-232 has a half-life of 68.9 years. A sample from 206.7 years ago contains 1.40 g of uranium-232. How much uranium was originally present?

In a system in which the enthalpy changed - 447.1 kJ/mol and the entropy decreases by 75.1 kJ/mol•K, calculate the temperature at which the system will be at equilibrium.

What is the concentration of a solution containing 1.11 g sugar (sucrose, C12H22O11, MW = 342.3 g/mol, d = 1.587 g/cm3) in 432 mL glycerine (C3H8O3, MW = 92.09 g/mol, d = 1.261 g/cm3) in molarity and molality.

What's the name of a wave moving along a line?

Does the energy in a solid increase or decrease when changing to a liquid?

Is iron a substance or mixture?

How can scientists study the composition of distant stars?