پرسیاری وزاری کیمیا 2022-2023 خولی یەکەم ، خوێندنی ئینگلیزی

0.25kj of energy is added to 10g of a material, the temperature changed 50K, the specific heat

When 25.0 mL of  5×10^-5M Pb(NO₃)₂ is combined with 25.0 mL of 4×10^-5M Na₂SO₄ , which of the
following is net ionic equation through K_sp calculation :  K_sp for PbSO₄ =1.6×10^-8

One of the following is a type of substitution reaction

Hydrogen combines vigorously with chlorine, but it reacts weakly with nitrogen , under the same condition, the factor affecting the rate of reaction is

Br₂ is oxidizing agent, displaces…………ions

The molecular formula for 3-ethyl-4-methylhexane is

: A reaction has ΔG= -834.3kj/mol and ΔS= – 38.5kj/mol  ,ΔH for the reaction at 448K is equal

Is an ion that does not act as a Bronsted-Lowry acid

The name of this compound: (CH₃-CH₂-NH-CH₃)  is

? Which of the following solutions has the highest osmotic pressure

In this reaction

NH₃(g)+H₂O(I)⇔NH₄⁺(aq)+OH^–(aq)‏

? which of the following is correct

In the following gaseous equilibrium system: 2SO₂+O₂ ⇔2SO₃ +energy , which of the
following changes are increase amount of SO₃?

In which of the following containers, can a solution of Sn(NO₃)₂ be stored? if the standard
reduction potential for each Sn²⁺,Zn²⁺,Al³⁺,Cu²⁺,Ni²⁺ respectively is equal
to ( -0.14, -0.76, -1.66, 0.34,-0.23 ) volt?

The boiling point of an aqueous solution of glucose is100.102^oc‏ , the expected boiling point for
which of the following solutions is 100.1036^oc, with the same concentration? K_b=0.51^oC/m

Is a poly atomic ion, the oxidation number of sulfur is +4

?Which of the following is a monomer of natural rubber

The overall electrochemical reaction that occurs spontaneously for a cell consisting of the half-cell:   MnO₂/Mn²⁺and Cr³⁺/Cr is: (E⁰ _reduce Cr³⁺/Cr = – 0.74V, E⁰_reduce MnO₂/Mn²⁺=1.22V)

 Is a compound that does not ionize in water

In this reaction

 ‏ 2Fe₂O₃(s)+3C(s) +467.9kJ→ 4Fe(s) + 3CO₂(g)

calculate the standard enthalpy of formation for  Fe₂O₃

if the standard enthalpy of formation for CO2 is  -393.5kj/mol‏

The following half-reaction:

 ( O₂(g) + 4e^–+ 2H₂O(I)→ 4OH^–(aq) )

occurs at cathode of

 Lewis acid is an atom, ion, or molecule form a covalent bond by

By using a catalyst in a reaction the forward activation energy is decreased by an amount,
which of the following is correct

It is used in biology laboratories as a preservative for dead animals

When an aqueous solutions of barium chloride and potassium sulphide combined, which of the
? following ions do not appear in the net ionic equation

? Which of the following compounds is a structural isomers of pentane according IUPAC system

The boiling point of ethanol is lower than the boiling point of

When a quantity of Al₂(SO₄)₃ is dissolved in water, 0.4 mole of aluminium ions are formed, how
? many moles of aluminium sulfate are dissolved

The anode electrode in a car battery is

An allotrope of carbon is a soft, black and conductor of electricity

One of the following compounds is not very soluble in water, it cannot produce strongly alkaline
solution

Is a process deposits metal onto a surface

When a zinc strip is in contact with a copper (II) sulfate solution

? Which of the following statements is true for dissolving ‎KNO₃‏ in water

The following reaction: A + 2B →C , is found to occur in the
one – step mechanism, by using the data in the adjacent table
the rate of the reaction in the second experiment is

In a reversible reaction, when the activation energy for exothermic change with activation
energy for endothermic change is compare, which of the following is correct

?Which of the following solutions has highest pOH value with the same concentration

 In this reaction: NO₂+CO→NO+CO_{2   ,} if the reaction of fast step is: NO₃+CO→NO₂+CO₂ by
what factor does the rate increase if [CO] doubled?

 In which of the following reaction the ΔH_ƒ^o
value of product is equal to ΔH^o   of reaction

 The pH of Ca(OH)₂ solution is 9.3, what is the concentration of Ca(OH)₂‏ solution?

: Neutralization is

This reaction

Cl₂+2Fe⁺²(aq) → 2Fe⁺³(aq)+2Cl^–(aq)

The volume of 0.2M of sulfuric acid is required to titrate with 0.5 mol of sodium hydroxide is

By adding KCN to HCN solution

The following reaction

 2Pb(NO₃)₂→ 2PbO+4NO₂+O₂    is

When a reaction is endothermic and leads to decrease randomness, the reaction is

The aqueous solution of NH₄CH₃COO is neutral because

The hybridization type of cycloalkane is

The suitable indicator for titration potassium hydroxide with ethanoic acid is

For the following gaseous reaction: 2HI⇔H₂+I₂

at equilibrium it is found that [HI]=0.24M  ,[H2]=[I2]=0.12M , the equilibrium constant for the reverse reaction is equal:

? Which of the following compound may be alkyne