Which of the following represents a physical change?

A: Phase changing, B: Atoms rearranging, C: Bonds breaking, D: Bonds forming

What instrument us normally used to measure atmospheric pressure

One teaspoonful diluted to 2 liters results in a 1/8000 solution. what is the amount of potassium permanganate in grams required to fill this prescription

1. a car is traveling 60 miles per hours on cruise control. what is the net force? 2. an object of mass 10kg is accelerated upward at 2m/s^2. what force is required? 3. what is the mass of an object if a force of 17n causes it to accelerate at 1.

The atomic mass of carbon is 12.01, hydrogen is 1.01, and oxygen is 16.00. What is the molar mass of glucose (C6H12O6) ?

What happens when a solid is dissolved into a liquid

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.