Which element represents 10% of the elements in the human body?

a. calcium

b. nitrogen

c. hydrogen

d. oxygen

The order of a reaction Z1) is the product of the powers to which the reactant concentrations are raised in the rate law.

What is the first element to have a different number of protons and neutrons in the nucleus?

A gas has a volume of 3.4 L at 25 °C, what is the final temperature if the volume increases to 4.7 L?

Which two values will a spontaneous reaction have? + Eoreduction and + Eocell - ∆G and + Eocell + ∆G and + Eocell + ∆G and - Eocell - ∆G and - K

Louis pasteur demonstrated that fermentation to produce alcohol is caused by

A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is

Which of these particles is the smallest? A. an atom B. a nucleus C. a proton D. an electron

In a five-fold serial dilution of a 20 pg/ml solution, all tube dilutions are 1/5. What is the substance concentration in the third tube of this series?

Which of the following substances is never a Brønsted-Lowry base in an aqueous solution? Group of answer choicespotassium hydroxide, KOHsodium hydrogen phosphate, Na2HPO4sodium phosphate, Na3PO4ammonium chloride, NH4Clsodium bicarbonate, NaHCO3

Why is gold less reactive than iron?