Chemistry Questions

7 An atom that has 13 protons and 15 neutrons is an isotope of the element(1) nickel (3) aluminum(2) silicon (4) phosphorus
1 Answers
How did each of the scientists below contribute to the scientific understanding of the atom?Aristotle, Democritus, Dalton, Thompson, Rutherford, Chadwick, Bohr, and Becquerel and the CuriesDue to the length of the question I am giving 25 points per person
1 Answers
An experiment produced 0.10 g CO2, with a volume of 0.056 L at STP. If the accepted density of CO2 at STP is 1.96 g/L, what is the approximate percent error?
1 Answers
Nitrogen gas is being held in a 14.3 L tank at a temperature of 62°C. What will the volume be when the temperature drops to 24°C?
1 Answers
Which solution has the highest boiling point at standard pressure?(1) 0.10 M KCl(aq)(2) 0.10 M K2SO4(aq)(3) 0.10 M K3PO4(aq)(4) 0.10 M KNO3(aq)
1 Answers
When dissolved in water, an Arrhenius base yields(1) hydrogen ions (2) hydronium ions(3) hydroxide ions (4) oxide ions
2 Answers
Which volume of 2.0M NaOH(aq) is need to completely neutralize 24 milliliters of 1.0M HCl(aq)?(1) 6.0mL (2) 12mL (3) 24mL (4) 48mL
1 Answers
Which compound is a member of the same homologous series as C3H8?(1) CH4 (3) C5H8(2) C4H8 (4) C6H10
2 Answers
Which substance is an Arrhenius acid?(1) LiF(aq) (3) Mg(OH)2(aq)(2) HBr(aq) (4) CH3CHO
2 Answers
Given the equation:HCl(g) + H2O(l)--> X(aq) + Cl--(aq)Which ion is represented by X?(1) hydroxide (3) hypochlorite(2) hydronium (4) perchlorate
2 Answers
At which temperature would atoms of a He(g) sample have the greatest average kinetic energy?(1) 25°C (3) 273 K(2) 37°C (4) 298 K
2 Answers
Given the balanced equation representing a reaction:CH4(g) + 2O2(g) --> 2H2O(g) + CO2(g) + heatWhich statement is true about energy in this reaction?(1) The reaction is exothermic because it releases heat.(2) The reaction is exothermic because it absorbs heat.(3) The reaction is endothermic because it releases heat.(4) The reaction is endothermic because it absorbs heat.
2 Answers
What is the chemical formula for zinc carbonate?(1) ZnCO3(2) Zn(CO3)2(3) Zn2CO3(4) Zn3CO3
1 Answers
Which chemical equation represents the reaction of an Arrhenius acid and an Arrhenius base?(1) HC2H3O2(aq) + NaOH(aq) --> NaC2H3O2(aq) + H2O(l)(2) C3H8(g) + 5 O2(g)--> 3 CO2(g) + 4 H2O(l)(3) Zn(s) + 2 HCl(aq)--> ZnCl2(aq) + H2(g)(4) BaCl2(aq) + Na2SO4(aq) --> BaSO4(s) + 2 NaCl(aq)
2 Answers
Which formula represents a nonpolar molecule containing polar covalent bonds?(1) H2O (3) NH3(2) CCl4 (4) H2
2 Answers
Which two characteristics are associated with metals?(1) low first ionization energy and low electronegativity(2) low first ionization energy and high electronegativity(3) high first ionization energy and low electronegativity(4) high first ionization energy and high electronegativity
2 Answers
Which formula represents a nonpolar molecule?(1) HCl (3) NH3(2) H2O (4) CH4
2 Answers
When one compound dissolves in water, the only positive ion produced in the solution is H3O+(aq). This compound is classified as(1) a salt(2) a hydrocarbon(3) an Arrhenius acid(4) an Arrhenius base
2 Answers