Is torn paper physical or a chemical change

Which element is present in all amino acids but not necessarily in fats or carbohydrates?

How do I convert 12 g into kg in a formula

Tests a common household substance and finds that it has a pH of 3.

Oxygen is composed of only one kind of atom and can't be separated into simpler substances. What type of matter is it? solution element mixture compound colloid

Which of the following statements is true about taste bud preferences?

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?