Esulfur burns easily. Iron is attracted by magnets. the mineral made by sulfur and iron, but it does not burn and it is not attracted by magnets. is it a mixture? why? and why not?

How does the periodic table organize atoms of elements with the same number of valence electrons? 1. in cells 2. in columns 3. in diagonals 4. in rows

Which statement best define energy

It takes 3 minutes to make toast in a 1500 watt toaster. Calculate how much work is done by the toaster.

Which of the following is an example of a first class lever?

What type of energy is released when fossil fuels are burned? a. electrical energy b. nuclear energy c. kinetic energy d. chemical energy

A 25kg object moves from left to right at a speed of 30km/h. What net force is required to keep this object moving in a straight line at constant speed

Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars.

Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE? a. The kinetic energy of the system is conserved to good approximation. b.

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.