As you sit in a chair in what direction (Or directions) does the chair exert a force on you

A) upward only

B) sideways only

C) downward only

D upward and downward

What is the atomic number of an element

Which block of elements do the halogens belong to? a. p block c. d block b. s block?

Which analogy best represents a supersaturated solution? an empty elevator that has a maximum load of 20 people a single person in an elevator that has a maximum load of 20 people 20 people in an elevator that has a maximum load of 20 people 25

How does an organic pH indicator works. (illustrate using chemical equations and mathematical expressions

Pure aluminum metal has density 2.70 g/cm3. If we added a solid aluminum cylinder to a graduated cylinder containing 19.2 mL of water, and the water level rises to 24.7 mL, what is the mass of the aluminum cylinder?

A reaction starts with 20.0 grams of lithium hydroxide (LiOH) and produces 31.0 grams of lithium chloride (LiCl), what is the percent yield of lithium chloride (LiCl) ? * LiOH + KCl - LiCl + KOH A) 64.5% B) 88.6% C) 81.5% D) 92.8%

You aren't sure if your pH meter needs to be calibrated, so you put it in a buffer solution that has a known pH of 7. You take four separate readings of the solution with the pH meter. The meter reports the pH as 5.5, 8.6, 6.3, and 9.4.

Can you explain and read this equation 2Mg + 02 - - 2MgO

The label of a gas cylinder has come off in your laboratory. You know that only one species of gas is contained in the cylinder, but you do not know whether it is hydrogen, oxygen, or nitrogen.

Give two example of compound that decompose to give off oxgyen gas