Which metalloid is often found in microchips, semiconductors, and sand?

a.

boron

b.

arsenic

c.

germanium

d.

silicon

If the activation energy for a given compound is found to be 42.0 kJ/mol, with a frequency factor of 8.0 * 1010 s-1, what is the rate constant for this reaction at 298 K? A) 2.9 * 10-4 s-1. B) 7.4 * 10-4 s-1. C) 1.4 * 109 s-1. D) 4.6 * 10 5 s-1.

What came first the chicken or the egg? im pretty sure i cant figure it out tho

Does the force of kinetic friction depend on the weight of the block? explain.

One object is fired at an angle of ten degrees above the horizontal. A second object is fired at an angle of ten degrees below the horizontal, and a third is fired in an exactly horizontal direction.

How does the burning of fossil fuels influence global temperature? How might the change in temperature affect other parts of Earth, such as the hydrosphere and biosphere?

How do inertia and centripetal force combine to keep an object moving in circular motion?

Compare and contrast the average kinetic energy of 0.5 L of coffee at 34°C, 0.5 L of coffee at 38°C, and 0.25 L of tea at 43°C.

A 7700-kg box car traveling at 14 m/s strikes a second car at rest. The two stick together and move off with a speed of 5.0 m/s. What is the mass of the second car?

What will happen if there is a change in a magnetic field?

Question 2 10 pts The voltage in a particular circuit is 10.0 V. The current in the circuit is 20 A. What is the resistance? A. 2.0 B. 30 C. 200 D. 0.5