###### Acids, alkalis and salts

Which formulas correspond to acid oxides and acid?

Which formulas correspond to acid oxides and acid?

Formulas $$N_2O_5$$and $$HNO_3$$  correspond acidic oxide and acid

###### Acids, alkalis and salts

What formulas of substances comply with  basic oxide and base?

What formulas of substances comply with  basic oxide and base?

Basic oxides and  base  relevant pairs $$Fe_2O_3 ; Fe(OH)_3$$ and $$FeO; Fe(OH)_2$$

###### Acids, alkalis and salts

Choose from the list of pairs, consisting of acidic and amphoteric oxides.

Choose from the list of pairs, consisting of acidic and amphoteric oxides.

$$N_2O_5$$ – acidic oxide and $$BeO$$ amphoteric oxide.

###### Acids, alkalis and salts

The barium hydroxide and potassium phosphate, respectively, are...

The barium hydroxide and potassium phosphate, respectively, are...

The barium hydroxide and potassium phosphate, respectively, are base and secondary salt.

###### Acids, alkalis and salts

The acidic properties of $$P_2O_5$$ are expressed stronger than acidic properties of...

The acidic properties of $$P_2O_5$$ are expressed stronger than acidic properties of...

The acidic properties of $$P_2O_5$$ are expressed stronger than acidic properties of $$SiO_2$$

###### Acids, alkalis and salts

Which compound is a salt?

Which compound is a salt?

$$Na_2CO_3$$ is a salt.

###### Acids, alkalis and salts

Sulphurous acid and nitrogen oxide (II) correspond to the formulas...

Sulphurous acid and nitrogen oxide (II) correspond to the formulas...

Sulphurous acid and nitrogen oxide (II) correspond to the formulas $$H_2SO_3$$ and $$NO$$.

###### Acids, alkalis and salts

Select a pair: amphoteric hydroxide and acid.

Select a pair: amphoteric hydroxide and acid

This pair is $$Al(OH)_3$$ and $$H_2SiO_3$$

###### Acids, alkalis and salts

In which direction the properties of oxides are  changed $$SO_3 → Al_2O_3 → Na_2O$$

In which direction the properties of oxides are  changed $$SO_3 → Al_2O_3 → Na_2O$$

The properties in row $$SO_3 → Al_2O_3 → Na_2O$$  are changed from acidic to basic.

###### Acids, alkalis and salts

Interaction of copper hydroxide (II) with a solution of sulfuric acid abbreviated corresponds to ionic equation:...

Interaction of copper hydroxide (II) with a solution of sulfuric acid abbreviated corresponds to ionic equation:...

Interaction of ocopper hydroxide (II) with a solution of sulfuric acid abbreviated corresponds to ionic equation: $$Cu(OH)_2 + 2H^+ = Cu^{2+} + 2H_2O$$

###### Acids, alkalis and salts

Exchange reactions correspond to the left part of the reaction scheme

Exchange reactions correspond to the left part of the reaction scheme:...

Exchange reactions correspond to the left part of the reaction scheme $$NaI + Pb(NO_3)_2 →$$

###### Acids, alkalis and salts

The reaction of some substances is neutralization reaction?

The reaction of some substances is neutralization reaction?

Neutralization reaction occurs from reacting of the acid and bases ($$KOH$$ and $$HNO_3$$). The result of the neutralization reaction is always salt and water are formed

$$KOH + HNO_3 \to KNO_3 + H_2O$$

###### Acids, alkalis and salts

Short ionic equation $$H^+ + OH^– \to H_2O$$ corresponds to the interaction of substances:

Short ionic equation $$H^+ + OH^– \to H_2O$$ corresponds to the interaction of substances:

Short ionic equation $$H^+ + OH^– \to H_2O$$ corresponds to the interaction of substances $$HNO_3$$ and $$Ba(OH)_2$$.

$$2HNO_3 + Ba(OH)_2 \to Ba(NO_3)_2 + 2H_2O$$

$$2H^+ + 2NO_3^- + Ba^{2+} + 2OH^- \to 2NO_3^- + Ba^{2+} + H_2O$$

###### Acids, alkalis and salts

Select the formula of hydroxide which will react both with acids and bases.

Select the formula of hydroxide which will react both with acids and bases.

Formula of hydroxide which reacts with acids and bases is $$Zn(OH)_2$$

###### Acids, alkalis and salts

Select the formula of hydroxide which can be obtained by dissolving its oxide in water.

Select the formula of hydroxide which can be obtained by dissolving its oxide in water

Formula of hydroxide which can be obtained by dissolving its oxide in water is $$KOH$$.

###### Energetics

What is the name of thermodynamic function, which characterizes the degree of ordering of the system?

What is the name of thermodynamic function, which characterizes the degree of ordering of the system?

Thermodynamic function which characterizes the degree of ordering of the system state is entropy.

###### Energetics

When the reaction $$NH_4NO_3(s) \to N_2O(g) + 2H_2O(g); \Delta H = –124,2 kJ; ΔG = –186,7 kJ,$$  it is:

When the reaction $$NH_4NO_3(s) \to N_2O(g) + 2H_2O(g); \Delta H = –124,2 kJ; ΔG = –186,7 kJ,$$  it is:

When the reaction $$NH_4NO_3(s) \to N_2O(g) + 2H_2O(g); \Delta H = –124,2 kJ; ΔG = –186,7 kJ,$$  it is exothermic and takes place under standard conditions in the forward direction.

###### Energetics

Which formula should be used to calculate the enthalpy of the chemical reaction $$CH_4(g) + 2O_2(g) \to CO_2(g) + 2 H_2O(g)$$

Which formula should be used to calculate the enthalpy of the chemical reaction $$CH_4(g) + 2O_2(g) \to CO_2(g) + 2 H_2O(g)$$

To calculate the enthalpy of the reaction $$CH_4(g) + 2O_2(g) \to CO_2(g) + 2 H_2O(g)$$ is possible due to the formula $$\Delta H = \Delta H (CO_2) + 2 \Delta H((H_2O(g)) - \Delta H(CH_4)$$.

###### Energetics

The enthalpy of formation of $$Na_2SO_4$$ corresponds to the thermal effect of the reaction:

The enthalpy of formation of $$Na_2SO_4$$ corresponds to the thermal effect of the reaction:

The enthalpy of formation of $$Na_2SO_4$$ corresponds to the thermal effect of the reaction: $$2Na + S + 2O_2 \to Na_2SO_4$$

If $$Na_2SO_4$$ formation of simple substances occurs, formation enthalpy is equal to standard enthalpy of formation.

###### Rates of reaction

Which of these factors do not affect the rate of the chemical reaction?

Which of these factors do not affect the rate of the chemical reaction?

The shape of the vessel in which the reaction takes place does not affect the rate of the reaction.

###### Rates of reaction

The rate of homogeneous chemical reaction is proportional to the change of...

The rate of homogeneous chemical reaction is proportional to the change of...

The rate of homogeneous chemical reaction is proportional to the change of the concentration of the substance per unit time.

###### Rates of reaction

What action is necessary to increase the reaction rate:$$2CO+O_2\to2CO_2 + Q$$

What action is necessary to increase the reaction rate:$$2CO+O_2\to2CO_2 + Q$$

Lowering of the temperature increases the rate of the exothermic reaction $$2CO+O_2\to2CO_2 + Q$$.

###### Rates of reaction

The rate of the chemical reaction between sulfuric acid and iron has no effect on...

The rate of the chemical reaction between sulfuric acid and iron has no effect on...

The rate of the chemical reaction between sulfuric acid and iron has no effect on the pressure increase.

###### Rates of reaction

Evaluate the validity of propositions about the rate of chemical reactions.

A. Upon heating, the rate of some reactions increases and of the others -  decreases.

B. The reason for increasing of the speed of reaction by heating is the increasing of  the frequency of collisions of particles.

A the only true

###### Equilibria

What affects the displacement of the chemical equilibrium?

What affects the displacement of the chemical equilibrium?

Changing the reaction temperature affects the displacement of the chemical equilibrium.

###### Equilibria

How to change the balance of reversible reaction $$C_2H_4(g)+H_2O(g)↔C_2H_5OH(g)$$ with increasing pressure

How to change the balance of reversible reaction $$C_2H_4(g)+H_2O(g)↔C_2H_5OH(g)$$ with increasing pressure

According to Le Chatelier's principle, by increasing the pressure, equilibrium is shifted in the direction which reduces the total number of moles of gas. This will shift the reaction equilibrium towards the reaction product.

###### Equilibria

For the offset of the chemical equilibrium of the reversible reaction $$2SO_2(g)+O_2(g)↔2SO_3(g)+Q$$ towards the necessary starting materials:

For the offset of the chemical equilibrium of the reversible reaction $$2SO_2(g)+O_2(g)↔2SO_3(g)+Q$$ towards the necessary starting materials:

Shifting equilibrium of the  reaction is possible both due to the pressure increase and the temperature decrease.

###### Equilibria

The equilibrium in the system $$2CO + O_2 ↔ 2CO_2, \Delta H <0$$ shifts to the right when:

The equilibrium in the system $$2CO + O_2 ↔ 2CO_2, \Delta H <0$$ shifts to the right when:

Temperature reduction of the exothermic reaction will shift the equilibrium toward the products. Increasing the pressure shifts the equilibrium of the system towards the smaller amount of substance (in this case to the right).

###### Equilibria

For exothermic ammonia synthesis process at lowering temperature and at the same time increasing pressure  the yield of ammonia

For exothermic ammonia synthesis process at lowering temperature and at the same time increasing pressure  the yield of ammonia

For exothermic ammonia synthesis process at the at lowering temperature and at the same time increasing pressure the yield of ammonia increases.