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3 years ago

Which statement describes a chemical property of matter?

Chemistry

2 answers:

Nady [450]3 years ago

8 0

Answer: D. Sodium is a very reactive element that combines easily with nonmetals

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

A. The density of ice is 0.4 g/ml is a physical property.

B. The boiling point of ethanol is $78.4^0C$ is a physical property.

C. Rust is a flaky material with an orange-red color is a physical property.

D. Sodium is a very reactive element that combines easily with nonmetals is a chemical property.

$4Na+O_2\rightarrow 2Na_2O$

Thus the statement that describes a chemical property of matter is Sodium is a very reactive element that combines easily with nonmetals.

solniwko [45]3 years ago

6 0

C because rust is a chemical property do you

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Complete the equation for the combustion of wood (assume carbon is the combustible material)

Sonbull [250]

Hi am sorry I am but you know

4 0

3 years ago

A certain first-order reaction (A→products) has a rate constant of 8.10×10−3 s−1 at 45 ∘C. How many minutes does it take for the

stira [4]

Answer:

The answer is 5.7 minutes

Explanation:

A first-order reaction follow the law of $Ln [A] = -k.t + Ln [A]_{0}$ . Where [A] is the concentration of the reactant at any t time of the reaction, $[A]_{0}$ is the concentration of the reactant at the beginning of the reaction and k is the rate constant.

Dropping the concentration of the reactant to 6.25% means the concentration of A at the end of the reaction has to be $[A]=\frac{6.25}{100}.[A]_{0}$ . And the rate constant (k) is 8.10×10−3 s−1

Replacing the equation of the law:

$Ln \frac{6.25}{100}.[A]_{0} = -8.10x10^{-3}s^{-1}.t + Ln[A]_{0}$

Clearing the equation:

$Ln [A]_{0}.\frac{6.25}{100} - Ln [A]_{0} = -8.10x10^{-3}s^{-1}.t$

Considering the property of logarithms: $Ln A - Ln B = Ln \frac{A}{B}$

Using the property:

$Ln \frac{[A]_{0}}{[A]_{0}}.\frac{6.25}{100} = -8.10x10^{-3}s^{-1}.t$

Clearing t and solving:

$t = \frac{Ln \frac{6.25}{100} }{-8.10x10^{-3}s^{-1} } = 342.3s$

The answer is in the unit of seconds, but every minute contains 60 seconds, converting the units:

$342.3x\frac{1min}{60s} = 5.7min$

6 0

3 years ago

Determine the differences In electronegativity ionic radius atomic radius and first ionization energy for oxygen and beryllium

Vilka [71]

Answer:

Electronegativity = 1.87.

Ionic radius = 109 pm.

Atomic radius = -39 pm

First ionization energy = 410 kJ/mol

Explanation:

Hello!

In this case, since electronegativity, ionic radius, atomic radius and first ionization energy are periodic properties that have specific trends, we can summarize it by realizing that oxygen and beryllium belong the same period 2 and differ in group, 6A and 2A respectively.

In such a way, the required comparison is written below:

Electronegativity = 3.44 (oxygen) - 1.57 (beryllium) = 1.87.

Ionic radius = 140 pm (oxygen)- 31 pm (beryllium) = 109.

Atomic radius = 73 pm (oxygen) - 112 pm (beryllium) = -39 pm

First ionization energy = 1310 kJ/mol (oxygen) - 900 kJ/mol (beryllium) = 410 kJ/mol

It means that electronegativity, ionic radius and first ionization energy increases from left to right whereas the atomic radius from right to left.

Best regards!

7 0

3 years ago

B. The equilibrium constant for the reaction 2H2(g) + S2(g) 2H2S(g) is Keq = . (3 points)

eimsori [14]

Answer:

i. Keq=4157.99.

ii. More hydrogen sulfide will be produced.

Explanation:

Hello,

i. In this case, for the concentrations at equilibrium on the given chemical reaction, the equilibrium constant results:

$Keq=\frac{[H_2S]^2}{[H_2]^2[S_2]} =\frac{(0.97M)^2}{(0.051M)^2(0.087)} =4157.99$

ii. Now, by means of the Le Chatelier's principle, the addition of a reactant shifts the reaction towards products, it means that more hydrogen sulfide will be produced in order to reach equilibrium.

Best regards.

4 0

3 years ago

WHO KNOWS HOW TO DO THISSS NEED HELP RN PLS Li PO4 + AlF →

Alecsey [184]

Explanation:

Your chemical equation should look like this:

Li3PO4 + AlF3 --> 3LiF + AlPO4

This is the balanced equation for a double-displacement reaction

4 0

3 years ago