7. I'm full of holes, yet flexible and thin. I control what gets out as well as what comes in ...

A small helium tank measures about two feet high. Yet it can fill over 50 balloons! How can such a small tank contain enough helium to fill so many balloons?

Create a chart that compares physical and chemical properties. Give two examples for each type of property

How many hours are between each high tide and low tide?

In a mixture of 2 gases (co2 and br2), 40.0 percent of the total gas pressure is exerted by the carbon dioxide. If the total pressure is 4.60 atm, what pressure does the bromine gas exert?

Which of the following is not an indication of a chemical reaction? 1.) Heat is generated when two substances are combined. 2.) A solid quickly forms when two liquids are combined. 3.) A substance melts when sitting in the Sun. 4.

Why might the increase of noise in natural areas be a problem, according to scientists studying wildlife? Support your answer with at least two details from the text.

What changes nitrogen gas in the air to nitrogen compounds that fall to the ground

How much time does it take a person to walk 12 km north at a velocity of 6.5 km/h

What are some ways that groundwater is used in the United States currently?

Atoms which have lost one electron from their outer shell are called what