How many milliliters of a 20% solution should be added to 60 ml of a 40% solution to obtain a 35% solution?

In a DNA molecule, if 38% of the molecular bases are C (cytosine), what percent of the bases are T (thymine) ?

Which is the best describes electrons

What is the density of a bar of silver with a mass of 68 g and a volume of 6.5 cm3? A. 442 g/cm3 B. 10.5 g / cm3 C. 0.096 g/cm3 D. 0.105 g/cm3

Is volume conserved

What is the PH of a solution if [H3O] = 1.7*10-3 M

The ionic naming rules

What is the PH of a solution whose [H+] is 0.0007

What was concluded about the structure of the atom as the result of the gold foil experiment? (1) A positively charged nucleus is surrounded by positively charged particles. (2) A positively charged nucleus is surrounded by mostly empty space.

Andre is predicting the products of chemical reactions. In one reaction, a hydrocarbon is the only reactant. What is the best prediction and explanation of this reaction? Two new compounds form as the hydrocarbon undergoes a synthesis reaction.

What evidence is there that electrons move around in definite pathways around the nucleus? What evidence is there that electrons m