How does the presence of a catalyst affect the activation energy of a reaction?

What is the pH scale used for? a. Measures hydroxide ion concentration (strength of the acid or base) b. Measures hydronium ion concentration (strength of the acid or base)

Starting from rest, the boy runs outward in the radial direction from the center of the platform with a constant acceleration of 0.5 m/s2. The platform rotates at a constant rate of 0.2 rad/s. Determine his velocity (magnitude) when t = 3 sec

The ocular lenses of our microscopes in lab provide 10X magnification. If you are viewing cells with the 40X objective lens what would the total magnification be?

Is mercury a terrestrial or gaseous planet

What is the mass of an object moved with a force of 540 N at an acceleration of 7.74 m/s2?

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?

When lava cools, what type of Rock forms?