How do I count atoms in science

Light enters water from air at an angle of 25° with the normal, Θ1. If water has an index of refraction of 1.33, determine Θ2. A) 18.5° B) 34.2° C) 31.8° D) 71.5°

Wilam made a chart to summarize the results of experiments with the photoelectric effect. Which best describes how to correct Wilam's error?

Which object had more potential energy when it was lifted to a distance of 10 meters? Show your calculation. (Remember that gravity = 9.8 m/sec2)

The electron cloud model is a modern theory about the structure of atoms that explains many of the atom's behaviors.

If a car traveling 60 miles per hour turns east but keeps the same speed has it accelerated? explain

Velocity is: а - speed and direction. b - distance divided by time. c - always the same as speed. distance multiplied by time. d - distance multiplied by time

The gauge pressure in each of the four tires of an automobile is 230 kpa. if each tire has a "footprint" of 180 cm2 (area touching the ground), determine the mass of the car.

A bus travels 20 KM and 30 minutes what is average speed of the bus

What is the total number of atoms in the following formula? CaBr2

A lifeguard on a beach observes that waves have a speed of 7 m/s and a distance of 4.6m between wave crests. what is the period of the wave motion?