In which era did the first fish appear?

a. Carboniferous

b. Paleozoic

C. Mesozoic

d. Permian

How many carbon dioxide (CO2) molecules are produced during the decomposition of 1.25 molecules of carbonic acid (H2CO3) ? Remember to use the balanced equation!

Name three types of particles found in an atom and explain how they differ

How do you draw s, p, d, f orbitals?

What is one advantage the United States has over Canada for maintaining a diversified economy? The U. S. has a greater gold resource. The U. S. has a greater labor resource. The U. S. has a greater per capita of fresh water. The U. S.

What is an example of bias in media

The volume of 1 mole of o2 gas at T=273k P=1atm is? A 6.02 x 10^-23 ml B 760 L C 22.4 L D 2.24 L E 224 L

There are two stable isotopes of bromine. Their masses are 78.9183 and 80.9163 amu. If the average atomic mass of bromine is 79.9091 amu, what is the natural abundance of the heavier isotope? percent abundance of 81Br __%

If 1.00 mol of argon is placed in a 0.500-L container at 20.0 ∘C, what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation) ? For argon, a=1.

Which of these is a covalent compound? 1. AICI3 2. CO 3. MgO 4. LiCI

What is a protein used for