- How many significant figures are in each of the following?
(a) 1.01
(b) 200.0
(c) 0.0021
(d) 0.0230
A baking powder can carries the statement, “Ingredients: corn starch, sodium
bicarbonate, calcium hydrogen phosphate, and sodium aluminum sulfate.”
Therefore, this baking powder is
(A) a compound
(B) a mixture
(C) a molecule
(D) a mixture of elements
Which of the following is a physical property of sugar?
(A) It decomposes readily.
(B) Its composition is carbon, hydrogen, and oxygen.
(C) It turns black with concentrated H 2 SO 4.
(D) It can be decomposed with heat.
(E) It is a white crystalline solid.- A substance that can be further simplified using ordinary means may be either
(A) an element or a compound
(B) an element or a mixture
(C) a mixture or a compound
(D) a mixture or an atom- Chemical action may involve all of the following EXCEPT
(A) combining of atoms of elements to form a molecule
(B) separation of the molecules in a mixture
(C) breaking down compounds into elements
(D) reacting a compound and an element to form a new compound and a
new element- The energy of a system can be
(A) easily changed to mass
(B) transformed into a different form
(C) measured only as potential energy
(D) measured only as kinetic energy- If the ΔH of a reaction is a negative quantity, the reaction is definitely