Which of these is the easiest mineral identification property to use when you want to know whether you have pyrite or actual gold?

a. heft

b. luster

c. streak

d. magnetism

50 g of ice at 0°C is dropped in a beaker containing 100 g of water at 0°C. What will be the contents of the beaker after 5 hours? Assume that the room temperature is 0°C. a. 150 g of water b. 25 g of ice and 125 g of water c.

Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 150,000 kg and a velocity of 0.

Which one of the following is a decomposition reaction? A. K2CO3 (s) → K2O (s) + CO2 (g) B. 4Fe (s) + 3O2 (g) → 2Fe2O3 (s) C. N2 (g) + 3H2 (g) → 2NH3 (g) D. 2LiOH (s) + CO2 (g) → Li2CO3 (s) + H2O (l)

What minimum number of cycles are necessary for the engine to lift a rock of mass 570 kg through a height of 150 m?

An electric current heats a 221 g (0.221 kg) copper wire from 20.0 °C to 38.0 °C. How much heat was generated by the current? (Ccopper = 0.093 kcal/kgC°)

Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes? Molecules group together Molecules slow down and contract Molecules speed up and expand Molecules move freely

A spring is used in a lab. It is vibrated at different frequencies and the wavelength is recorded. Using the graph of the data, what is the relationship found between frequency and wavelength? A) Frequency and wavelength are inversely related.

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?

What causes the stars to appear to move across the night sky?

Two waves collide and the temporary combined waves that results is smaller that the original wave. which term describes this interaction? A. destructive interference B. standing wave formation C. diffraction D. constructive interference