2-From the opposite figure shows the temperature of three materials ,Which of the following is correct?

when a piece of copper its temperature equals 1500c is thrown in boiling water ,heat transfers from copper to water due to ......

the quantity of heat of 12.54x10-3 KJ is equivalent to......

In the opposite figure shows the specific heat of four materials have the same temperature , Which of the following express es the correct arrangement of these materials according the final temperature where they heated by the same thermal source for equally time.

If you know the specific heat of an amount 1g of iron is 0.444J/g.0c, So the specific

heat for another an mount 10g of iron equal.......

Calculate the quantity of heat accompanied of dissolving AMOUNT of NaOH in an amount of water to make a solution its volume is 2L ,Knowing that the temperature is raised from 180c to 320c.

from the reaction 1⁄2 H2(g) + 1⁄2 I2(g) +26KJ .......> HI(g)

The value of ∆H of the following reaction :2HI (g) .....> H2(g) +I2(g)

is…..

Phosphorus pentachloride gas decomposes by heat to phosphorus trichloride

gas and chlorine gas . PCl5 ----------- > PCl3 + Cl2 What is the amount of the change in the heat content of this reaction ?

in terms of the equations: H2SO4(aq) [98%] + nH2O ......> H2SO4(aq)[30%]

The heat change accompanied with this process is called the heat of ........

In the following reaction : N2 + 2O2 ........> 2NO2(g) , ∆H =+66KJ

What is the change of the heat content at produce 23g of nitrogen dioxide gas ? [N=14,O=16]

In the following reaction : H2(g) +Br2(g) ......> 2HBr(g) , if knowing that the average of energy bonds by(KJ/mol) are(H-H)=432 ,(Br-Br) =193 ,(H-Br)=366 , what is the molar enthalpy of HBr gas?

To raise the temperature of 15g of the metal (X) from 250c to 320C ,it requires

an amount of heat equals

178.1 J , What is the specific heat of the metal(X)?

it is concluded from the equation: N2(g) + 3H2(g) .......> 2NH3(g) ∆H = -92 KJ That the molar enthalpy of ammonia equals .......

(334 J )of heat required to convert 1g of ice to 1g of water at 0 0c , Which of the following values correlates with this process?

The following table illustrates the specific heat of some elements in J/g.0c:

When equals masses of these elements are exposed to same quantity of heat . The element whose temperature rises faster is ..........

The quantity of heat which equals (8.36 x10-3 KJ) is equivalent to.......

Why is water used as a cooling substance for car engines ? Because ........

when 50 g sample of copper (its specific heat =0.385 J/g. 0c) was heated ,its temperature increased by 100c

احسب الطاقة االي من الcopper الاول

What is the increase which occurs in the temperature of 10 g of water when they are provided by the same quantity of heat that copper acquired?

From the opposite energy diagram : ,What is the value of the change in heat

content of the reaction : C +D.....> A+ B?

ركز عشان انا عاكس ي جحش

On dissolving (28g) of potassium hydroxide in water to form 1L of the solution, the temperature has risen by 6.89 0c What is the molar heat of solution of potassium hydroxide ? [K=39,H=1,O=16]

in terms of the thermochemical equation : CH4(g) .......> C(S) + 4H(g) ∆H=

+1648 KJ/mol

What is the energy of the bond (C-H) ?

In the opposite figure , on dissolving caustic potash in water , the reading of

thermometer rises ,

This means that this process is........

in terms of the opposite energy diagram : Which of the following statements is

Heat of solution ΔHsol is estimated from the relation : ΔHsol = ΔH1 + ΔH2 + ΔH3

if you know that the solution of calcium oxide in water is exothermic, so which of the previous values of ΔH is higher ?

In terms of the reaction : Br2(l) + H2(g) ⎯> 2HBr(g) ∆H = -72 kJ

The thermochemical reaction that represent the decomposition of 1 mol of hydrogen bromide.

which of these substance reach 80°C Faster ?

Which of the following statements represents the type of the chemical reaction

, which occurs on rubbing awooden match against a rough surface?

in the thermochemical reaction : R2 + Q2 ......> 2RQ Which of the following represents the reaction which produces the highest amount of heat ?

in terms of the following equations: LiBr(s) ...water.....> LiBr(aq) ∆H0SOL= -49.8 KJ/mol

What is the amount of the absorbed heat when 0.87 g of LiBr [LiBr = 87g/mol]

1-the earth’s atmosphere represents ..........

1-the earth’s atmosphere represents ..........