Determine the mass of oxygen in a 7.2 - g sample of A l 2 (S O 4) 3.

Which of the following describes a response to external stimuli? a boy sneezes when exposed to cat dander a girl eats food when she is hungry a child becomes hyperactive due to a chemical imbalance a person yawns when oxygen levels in the blood are

Which tools are used to measure weather? Choose all answers that are correct. A. barometer B. rain gauge C. anemometer D. speedometer

What is the velocity of a 74.8kg jogger with a kinetic energy of 1085.0 j?

Why is the radius of a positive ion always less than the radius of its neutral atom? (A) the nucleus pulls the remaining electrons in closer. (B) The number of principal energy levels is always reduced.

The release of a gas from a chemical reaction is very quick. A scientist wants to measure what is released, but in small increments.

What is an isotope? how is the mass calculated?

How many liters of hydrogen are needed to produce 34 grams NH3

How does temperature change affect waters cohesion?

Does NH3 dissolve in acetone?

If an unknown mineral has a hardness between 5 and 9, what could you do to the mineral to find out more about its hardness?