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3 years ago

Select the physical properties. select all that apply. density hardness boiling point melting point reactivity fllammability

Chemistry

2 answers:

Crank3 years ago

7 0

Answer: Density, Hardness, Boiling point, Melting Point

Explanation: Physical Properties are those properties which can be measured. These are those observables which can be used to defined to the state of the system and which do not bring any change in the molecular composition of the system.

Whereas Chemical Properties are those which can bring changes in the original identity of the composition.

Out of the given, Density, Hardness, Boiling Point and Melting Point r the properties due to which the physical state of any system can be defined.

Reactivity and Flammability cannot be considered among them.

anzhelika [568]3 years ago

4 0

The answer to the given problem are:
1. Density
2. Hardness
3. Boiling Point
4. Melting Point

These are the list of physical properties except for two which are reactivity and flammability. These two should be excluded in the list of physical properties.

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Ammonium perchlorate (NH,CIO) is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen

meriva

Answer: The mass of oxygen gas produced is 2.4 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of ammonium perchlorate = 8.84 g

Molar mass of ammonium perchlorate = 117.5 g/mol

Putting values in equation 1, we get:

$\text{Moles of ammonium perchlorate}=\frac{8.84g}{117.5g/mol}=0.0752mol$

The chemical equation for the decomposition of ammonium perchlorate follows:

$2NH_4ClO_4\rightarrow N_2+Cl_2+2O_2+4H_2O$

By Stoichiometry of the reaction:

2 moles of ammonium perchlorate produces 2 moles of oxygen gas.

So, 0.0752 moles of ammonium perchlorate will produce = $\frac{2}{2}\times 0.0752=0.0752mol$ of oxygen gas

Now, calculating the mass of oxygen gas from equation 1, we get:

Molar mass of oxygen gas = 32 g/mol

Moles of oxygen gas = 0.0752 moles

Putting values in equation 1, we get:

$0.0752mol=\frac{\text{Mass of oxygen gas}}{32g/mol}\\\\\text{Mass of oxygen gas}=(0.0752mol\times 32g/mol)=2.4g$

Hence, the mass of oxygen gas produced is 2.4 grams

7 0

3 years ago

The vapor pressure of dichloromethane, CH2Cl2, at 0 ∘C is 134 mmHg. The normal boiling point of dichloromethane is 40. ∘C. How w

Elden [556K]

Answer:

The molar heat of vaporization of dichloromethane is 30.8kJ/mole

Explanation:

Using Clausius Clapeyron equation

ln (P1/P2) = (ΔHvap/R) (1/T2-1/T1)

At initial temperature of Ooc , the vapour pressure is 134mmHg

Therefore T1 = 0+273 =273K

And P1 = 134mmHg

At normal boiling point of 40oC , the vapour pressure is 760mmhg

T2 = 40 +273 = 313K

P2 = 760mmHg

ln (134/760) = ΔHvap/(8.3145 J/molK)

( 1/313K - 1/273K)

ΔHvap = 30800J/mol

= 30.8kJ/mol

Therefore, the molar heat of vaporization can be calculated using

Clausius Clapeyron equation using the above steps

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3 years ago

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Which one of the following is most likely to lose electrons when forming an ion?

otez555 [7]

Answer:

Option A) Na

Explanation:

From the options given above, sodium (Na) is most likely to lose electron to form ion

Na is a group 1 metal. Metals form ions by losing electron(s).

From the options given above, only Na is a metal and so it is most likely to form ion by losing electron

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A substance that cannot be broken down into other substances by ordinary chemical procedures is an

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An ELEMENT is a substance that cannot be broken down into other substances by ordinary chemical procedures. Some easy examples would be: gold, iron, carbon, hydrogen, oxygen, nitrogen.

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Which force prevents protons from repelling each other inside a nucleus?

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Which force prevents protons from repelling each other inside a nucleus?

the gravitational force

the weak nuclear force

the electromagnetic force

the strong nuclear force

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