Zadanie 19
Which products form in the reaction between nitric acid and calcium carbonate? A. Ca(NO3)2 + H2O + CO B. CaNO3 + H2O + CO2 C. Ca(NO3)2 + CO2 D. Ca(NO3)2 + H2O + CO2
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Which products form in the reaction between nitric acid and calcium carbonate? A. Ca(NO3)2 + H2O + CO B. CaNO3 + H2O + CO2 C. Ca(NO3)2 + CO2 D. Ca(NO3)2 + H2O + CO2
At a certain temperature the equilibrium constant for the reaction below is Kc = 50. H2(g) + I2(g) ⇌ 2 HI(g) What is the value of Kc for the reaction below at the same temperature? 2 HI(g) ⇌ H2(g) + I2(g) A. 0.020 B. 0.14 C. 25 D. 50
A 10.0 cm3 sample of 0.0100 mol dm−3 nitric acid, HNO3(aq), is diluted with water to a final volume of 10.0 dm3. What is the change in pH? A. increases by 3 B. increases by 2 C. decreases by 2 D. decreases by 3
What is the conjugate base of H2PO4−? A. H3PO4 B. HPO42− C. PO43− D. H3O+
The following equations represent reactions that occur spontaneously. Zn(NO3)2(aq) + Mg(s) → Mg(NO3)2(aq) + Zn(s) Cu(NO3)2(aq) + Zn(s) → Zn(NO3)2(aq) + Cu(s) 2 AgNO3(aq) + Cu(s) → Cu(NO3)2(aq) + 2 Ag(s) What is the increasing order of…
What is the pH of a 5.0 × 10−3 mol dm−3 aqueous solution of nitric acid, HNO3? A. 0.0050 B. 2.30 C. 3.00 D. 11.70
Which statement is correct for a voltaic cell made from a zinc half-cell and a copper half-cell? The standard electrode potential of the zinc half-cell is more negative than that of the copper half-cell. A. Zinc is the cathode. B. Electrons flow through the…
Which statement is correct for the following spontaneous reaction? 2 I−(aq) + H2O2(aq) + 2 H+(aq) → I2(aq) + 2 H2O(l) A. I− is the oxidizing agent and H2O2 is oxidized B. I− is the oxidizing agent and H2O2 is reduced C.…
What are the products of the electrolysis of molten lead(II) bromide, PbBr2(l)? A. Pb(l) + Br2(g) B. Pb2+(l) + 2 Br−(l) C. Pb2+(l) + Br2(g) D. Pb(l) + 2 Br−(l)
Zinc lies above nickel in the reactivity series. A voltaic cell is made from a zinc electrode in Zn2+(aq) and a nickel electrode in Ni2+(aq). The electrodes are connected by a wire with a voltmeter, and the two solutions are connected by a salt…