Please help me with these questions and if you can explain how you got 6,8,10,12,14, 20,21,24 and 26 if there's an explanation for them. I would be extremely grateful. 1. The speed of a chemical reaction increases with:
a. increase of temperature and activating energy
b. decrease of temperature and activating energy:
c. decrease of temperature and increase of activating energy
d. increase of temperature and decrease of activating energy
2. Substances that soften the speed of chemical processes are called:
a. activators
b. inhibitors
c. catalysts
d. stabilizers
3. The speed of the homogeneous catalytic process depends on
a. the nature of the reactants
b. the concentration of the reactants
c. the nature of the catalyst
d. temperature
4. The thermal effect of a chemical reaction is:
a. depending on the speed and conditions under which the reaction takes place
b. the energy that is emitted during the formation of chemical bonds in the products
c. the amount of heat that is released or absorbed during its flow
d. the energy that particles must possess in order to participate in effective shocks
5. The solubility of a substance in a given solvent at a given temperature is measured by the concentration of the solute in:
a. saturated solution
b. highly dilute solution
c. unsaturated solution
d. saturated solution
6. The solution of has an acidic chemical character:
a. K2CO3
b. CH3COOk
c. LiNO3
d. ZnCl2
7. What is the degree of oxidation of O2?
a. -1
b. + 2
c. - 2
d. + 4
8. In which row does nitrogen decrease its oxidation state?
a. NO2, N2, NH3
b. NH3, NH4Cl, N2O3
c. N2, N2O3, N2O5
d. NH3, N2O, NO
9. Which statement does NOT apply to non-metals?
a. Their oxides have acidic properties
b. Their hydroxides are basic
c. They have molecular hydrogen compounds
d. They accept electrons that form negative ions
10. Metals react with dilute HCl and H2SO4, excluding:
a. Al and Fe
b. Cu and Ag
c. Zn and Pb
d. Mg and Ba
11. Depending on the number of hydroxide OH^- ions that can be released from 1 mol of substance, hydroxides are divided into:
a. basic and amphoteric
b. basic and acidic
c. monovalent and multivalent
d. monobasic and polybasic
12. In which order are only salts listed?
a. CH2Cl, Cu(CH3COO)2, KHCO3
b. C6H5ONa, Ca(OH)2, Al2(SO4)3
c. NH4CL, CH3Br, NaAlO2
d. Pbl2, NaHCO3, Zn(CH3COO)2
13. Which of the given pairs of compounds are homologues and which isomers?
A 2,2-dimethylbutane, 2,2-dimethylpropane
B toluene, ethylbenzene
C 1,1-dichloroethane, 1,2-dichloroethane
a. A-comoloses, B-homologues, B-isomers
b. A-isomers, B-homologues, C-isomers
c. A-isomers, B-isomers, C-comologues
d. A-homologues, B-isomers, C-isomers
14. In which order are the oxides that form oxoacids?
a. N2O, N2O5, NO
b. Cl2O3, P2O5, CO
c. Al2O3, Cl2O, Cu2O
d. SO3, N2O5, Cl2O
15. In which order are the oxides that form oxoacids?
16. What is the thermal effect of diffusion?
17. What is electrolyte dissociation?
18. Express:
KOH + NH4Cl ->
Na2S + H2SO4 ->
Ca(OH)2 + HCl ->
19. The hydrolysis of esters is a reversible hydrolysis process. How is it different from hydrolysis of salts?
20. Complete the equations and determine the reducer and oxidizer.
Fe + CuSO4 ->
Al + HCl ->
Zn + N2SO4 ->
Zn + CuCl2 ->
21. Express the degree of oxidation of the compounds.
MnO2, Cl2O7, KMnO4, HClO2, HNO3
22. What types of salts are there?
23. What process takes place when a direct electric current passes through melts and aqueous solutions of salts?
24. Express the interaction of aluminum with sodium hydroxide.
25. How are hydrocarbons characterized by the type of chemical bonds?
26. By what method is zinc obtained? Express:
27. What does the thermal effect depend on?
28. How is the speed of chemical processes measured?
29. Is the rate constant influenced by the concentration of the starting substances?