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3 years ago

Create a chart that compares physical and chemical properties. Give two examples for each type of property

Chemistry

1 answer:

Zinaida [17]3 years ago

3 0

Answer:

Chemical properties:

Those properties which change the chemical nature of matter.

Example:

Heat of combustion
Enthalpy of formation

Physical properties:

Those properties which do not change the chemical nature of matter.

Example

Differences between chemical and physical properties:

Chemical properties Physical properties

1. Observed after the change bringing 1. Observed with out being

the change change

2. These changes the molecules 2. only change physical state

3. Chemical identity changes 3.Chemical identity not changes

4. Structure of material changes 4.Structure of material not change

5. Chemical reaction is needed 5. No need of Chemical reaction

6. depend on composition 6. Does not depend on composition

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How many moles are 7 grams of calcium oxide? (Atomic mass of Calcium - 40 u, oxygen-16 u)

White raven [17]

Answer:

0.125

Explanation:

no of moles = given mass / molar mass

no of moles = 7/

molar mass of calcium oxide = atomic mass of calcium + oxygen

molar mass = 40 + 16

molar mass = 56

no of moles = 7/ 56 = 1/8 = 0.125

8 0

3 years ago

Calculate ΔG∘rxn for the following reaction:4CO(g)+2NO2(g)→4CO2(g)+N2(g).Use the following reactions and given ΔG∘rxn values:A)

mihalych1998 [28]

Answer : The value of $\Delta G^o_{rxn}$ for the reaction is -1131.4 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

The given main reaction is,

$4CO(g)+2NO_2(g)\rightarrow 4CO_2(g)+N_2(g)$ $\Delta G^o_{rxn}=?$

The intermediate balanced chemical reaction will be,

(1) $2NO(g)+O_2(g)\rightarrow 2NO_2(g)$ $\Delta G^o_1=-72.6kJ$

(2) $2CO(g)+O_2(g)\rightarrow 2CO_2(g)$ $\Delta G^o_2=-514.4kJ$

(3) $\frac{1}{2}O_2(g)+\frac{1}{2}N_2(g)\rightarrow NO(g)$ $\Delta G^o_3=87.6kJ$

Now we will reverse the reaction 1, multiply the reaction 2 by 2, reverse and half the reaction 3 and then adding all the equations, we get :

(1) $2NO_2(g)\rightarrow 2NO(g)+O_2(g)$ $\Delta G^o_1=72.6kJ$

(2) $4CO(g)+2O_2(g)\rightarrow 4CO_2(g)$ $\Delta G^o_2=2\times (-514.4kJ)=-1028.8kJ$

(3) $2NO(g)\rightarrow O_2(g)+N_2(g)$ $\Delta G^o_3=-2\times 87.6kJ=-175.2kJ$

The expression for $\Delta G^o_{rxn}$ will be,

$\Delta G^o_{rxn}=\Delta G^o_{1}+\Delta G^o_{2}+\Delta G^o_{3}$

$\Delta G^o_{rxn}=(72.6kJ)+(-1028.8kJ)+(-175.2kJ)$

$\Delta G^o_{rxn}=-1131.4kJ$

Therefore, the value of $\Delta G^o_{rxn}$ for the reaction is -1131.4 kJ

3 0

3 years ago

A compound of formula XCl3 reacts with aqueous AgNO3 to yield solid AgCl according to the following equation: XCl3(aq)+3AgNO3(aq

Levart [38]

Answer:

Aluminum

Explanation:

$Moles =\frac {Given\ mass}{Molar\ mass}$

Mass of $AgCl$ = 1.68 g

Molar mass of $AgCl$ = 143.32 g/mol

Thus,

$Moles\ of\ AgCl=\frac {1.68}{169.87}=0.01172$

From the reaction below:

$XCl_3_{(aq)}+3AgNO_3_{(aq)}\rightarrow X(NO_3)_3_{(aq)}+3AgCl_{(s)}$

3 moles of $AgCl$ are produced when 1 mole of $XCl_3$ undergoes reaction.

So,

1 mole of $AgCl$ are produced when $\frac {1}{3}$ mole of $XCl_3$ undergoes reaction.

0.01172 mole of $AgCl$ are produced when $\frac {1}{3}\times 0.01172$ mole of $XCl_3$ undergoes reaction.

Thus, moles of $XCl_3$ = 0.0039 moles

Let the atomic mass of X = x g/mol

atomic mass of chlorine = 35.5 g/mol

Thus, Molar mass of $XCl_3$ = x + 3(35.5) g/mol = x + 106.5 g/mol

Moles = 0.0039 moles

Mass = 0.521 g

Thus, molar mass = Given mass/ Moles = 0.521 / 0.0039 = 133.5897 g/mol

So,

x + 106.5 = 133.5897

x = 27.0897 g/mol

This Atomic weight corresponds to Aluminum. Hence, X is aluminum.

8 0

4 years ago

What are isotopes_???

Brrunno [24]

Answer:

Below!

Explanation:

Isotopes are elements with a similar chemical makeup and the same atomic number, but a different atomic mass and number of neutrons . An example of this would be carbon-12, carbon-13, and carbon-14. Three isotopes of the element carbon that have the same 6 protons but have a different neutron count. A simple way to explain isotopes would be to say that they are just different "versions" of an element.

Hope this helps ya! Best of luck <3

8 0

3 years ago

Read 2 more answers

When forming ions, both gallium and sulfur take on the same electron configuration as what element

guapka [62]

Answer:

GaS

Explanation:

GaS is Gallium and Sulfuric Acid.

Melting point = 965°C

Appearance: Yellow crystal

Density: 3.86 g / cm³

I hope this helps you :)

8 0

3 years ago