Chemistry Questions
Explore questions in the Chemistry category that you can ask Spark.E!
What is the oxidation number of nickel in NiCO₃?a. 0b. +1c. +2d. +3
The formation of a solid product in a chemical reaction is represented by the symbola. (aq)b. (g)c. (l)d. (s)
In the reaction described by the word equation "sodium + water → sodium hydroxide + hydrogen gas"a. sodium hydroxide is a productb. sodium is a productc. water is a reactantd. Both (a) and (c)
In the expression 3CO₂, the numbers 3 and 2 are, respectively, a. a subscript and a coefficientb. a coefficient and a subscriptc. two subscriptsd. two coefficients
What symbol indicates a reversible reaction?a. ↔b. ↑c. →d. ←
What is the oxidation number of phosphorus in the PO₄³⁻ ion?a. -3b. 0c. +5d. +8
What is the mass of 4.80 mol of barium hydride, BaH₂?a. 4.80gb. 29.0gc. 139gd. 660g
To balance a chemical equation, you musta. adjust the subscriptsb. adjust the number of productsc. c. adjust the number of reactantsd. adjust the coefficients
What is the mass percentage of cobalt in cobalt(II) fluoride, CoF₂?a. 33.33%b. 39.20%c. 60.80%d. 96.93%
The molar mass of water is equal to a. 1g of O plus 2g of Hb. 1g of O plus 1g of Hc. the mass of 1 mol of O plus the mass of 1 mol of Hd. the mass of 1 mol of O plus the mass of 2 mol of H
From a complete and correctly written chemical equation, you can obtain thea. chemical formulas of the reactants and productsb. relative amounts of the reactants and productsc. physical states of the reactants and productsd. All of the above
What is the molecular formula for the compound that is made up of 30.45g N and 69.55g O, and has a formula mass of 92.02 AMU?a. NOb. N₂O₂c. NO₂d. N₂O₄
What is the molecular formula for the compound with a formula mass of 58.12 AMU and an empirical formula of C₂H₅?a. C₂H₅b. C₄H₁₀c. C₆H₁₅d. C₈H₂₀
The simplest whole-number ratio of moles of each element in a compound is known as the a. percent compositionb. empirical formulac. Stock formulad. molecular formula
What is the molar mass of pure tin?a. 1.00 g/molb. 47.88 g/molc. 118.71 g/mold. 237.42 g/mol
Atoms have an oxidation number of zero in a(n)a. pure elementb. acidc. ionic compoundd. molecular compound
Which of the following mathematical expressions correctly states the relationship among percentage yield, actual yield, and theoretical yield?a. actual yield= percentage yield/theoretical yield • 100b. percentage yield= actual yield/theoretical yield • 100c. theoretical yield= actual yield/percentage yield • 100d. Both B and C
pH range of color change, color below lower pH, and color above pH of Methyl Orange
pH range of color change, color below lower pH, and color above pH of Bromthymol blue
pH range of color change, color below lower pH, and color above pH of Litmus