CHEMISTRY HIGH SCHOOL

Calculate the density of a piece of bone with a mass of 3.8 grams and a volume of 2.0 cubic centimeters. 1.9 g/cm3 0.53 cm3/g 7.6 g /cm3

Answers

Answer 1

Answer:

Answer: The density if the bone is $1.9g/cm^3$ .

Explanation:

Mass of the bone = 3.8 grams

Volume of the bone = $2.0 cm^3$

Density is defined as mass present in per unit volume of the substance.

$density=(Mass)/(Volume)=(3.8 g)/(2.0 cm^3)=1.9g/cm^3$

The density if the bone is $1.9g/cm^3$ .

Answer 2

Answer:

Answer:

1.9 g/cm

That's your answer!!

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An equilibrium mixture of PCl5(g), PCl3(g), and Cl2(g) has partial pressures of 217.0 Torr, 13.2 Torr, and 13.2 Torr, respectively. A quantity of Cl2(g) is injected into the mixture, and the total pressure jumps to 263.0 Torr (at the moment of mixing). The system then re-equilibrates. The appropriate chemical equation is:PCl3(g) + Cl2(g) ---> PCl5(g)

Calculate the new partial pressures after equilibrium is reestablished. [in torr]

PPCl3

PPCl2

PPCl5

Answers

equilibrium is a situation in which economic forces such as supply and demand are balanced and in the absence of external influences the values of economic variables will not change

The equilibrium constant depends on the following:-

Pressure
Volume

The formula used in the question is as follows:-

$k_p = (P_1)/(P_1*P_2)$ , After putting the value, the equilibrium constant is as follows:-

$k_p = (217)/(13.2*13.2)$

After solving it, the equilibrium constant is 1.245.

The pressure in different systems is as follows:-

Hence, the total pressure is:- $P_1 + P_2+ P_3$

$263 = 13.2 + P_2 + 217$

After solving it, the P2 is 32.8torr.

The equilibrium constant in the second case is:-

$k_p = (P_1^')/(P_1^' * P_2^')$

After putting the value,

$1.245= (217+x)/((13.2-x )* (32.8-x))$

After solving, the value of x is 6.402torr

Hence, the partial pressure $PCL_3,\ CL2, \ PLC_5\$ is 6.798, 26.398, and 223.402 respectively.

For more information, refer to the link;-

brainly.com/question/18222206

Answer:

The new partial pressures after equilibrium is reestablished for $PCl_3$ :

$P_1'=6.798 Torr$

The new partial pressures after equilibrium is reestablished $Cl_2$ :

$P_2'=26.398 Torr$

The new partial pressures after equilibrium is reestablished for $PCl_5$ :

$P_3'=223.402 Torr$

Explanation:

$PCl_3(g) + Cl_2(g)\rightleftharpoons PCl_5(g)$

At equilibrium before adding chlorine gas:

Partial pressure of the $PCl_3=P_1=13.2 Torr$

Partial pressure of the $Cl_2=P_2=13.2 Torr$

Partial pressure of the $PCl_5=P_3=217.0 Torr$

The expression of an equilibrium constant is given by :

$K_p=(P_1)/(P_1* P_2)$

$=(217.0 Torr)/(13.2 Torr* 13.2 Torr)=1.245$

At equilibrium after adding chlorine gas:

Partial pressure of the $PCl_3=P_1'=13.2 Torr$

Partial pressure of the $Cl_2=P_2'=?$

Partial pressure of the $PCl_5=P_3'=217.0 Torr$

Total pressure of the system = P = 263.0 Torr

$P=P_1'+P_2'+P_3'$

$263.0Torr=13.2 Torr+P_2'+217.0 Torr$

$P_2'=32.8 Torr$

$PCl_3(g) + Cl_2(g)\rightleftharpoons PCl_5(g)$

At initail

(13.2) Torr (32.8) Torr (13.2) Torr

At equilbriumm

(13.2-x) Torr (32.8-x) Torr (217.0+x) Torr

$K_p=(P_3')/(P_1'* P_2')$

$1.245=((217.0+x))/((13.2-x)(32.8-x))$

Solving for x;

x = 6.402 Torr

The new partial pressures after equilibrium is reestablished for $PCl_3$ :

$P_1'=(13.2-x) Torr=(13.2-6.402) Torr=6.798 Torr$

The new partial pressures after equilibrium is reestablished $Cl_2$ :

$P_2'=(32.8-x) Torr=(32.8-6.402) Torr=26.398 Torr$

The new partial pressures after equilibrium is reestablished for $PCl_5$ :

$P_3'=(217.0+x) Torr=(217+6.402) Torr=223.402 Torr$

Except for oxygen what is another name for a burning reaction?

Answers

Complete combustion occurs when the break is made carbonic chain and the oxidation of all the carbon atoms of the carbonic chain.

and another name :
In this case, no amount of oxidant, i.e. oxygen enough to burn all the fuel.

hope this helps!

When rocks break down because of chemical reactions it is called

Answers

When rocks break down because of chemical reactions it is called chemical weathering. The rocks are weakened and subsequent disintegration of rock by chemical reactions. They can be oxidation, hydrolysis and carbonation.

A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?

Answers

Physical change.

Explanation:

This is a physical change.

The reason for escaping pops is the water caught internal parts it's bit.
Inside the event that the bit is warmed to a tall satisfactory temperature, this water will modify into steam. Due to the troublesome and for the preeminent parcel nonporous shell, the steam has no put to go, coming nearly in a buildup of weight internal parts the bit.
Once the weight gets tall satisfactory and the temperature comes to around 180 degrees Celsius (355 degrees Fahrenheit), the pops escape from the skillet or bursts and the popcorn is turned internal parts out.

The group of molecules called nucleotides contain: A)           phosphate groups.
                B)            pyrimidines.
                C)            purines.
                D)           pentose (a 5-carbon sugar).
                E)            all of the above.

Answers

The group of molecules of nucleotides contain phosphate, purines, pyrimidines, and pentosesugar. The correct option is E.

What is nucleotide?

Nucleotides are organiccompounds made up of a nucleoside and a phosphate. They function as monomericunits of the nucleic acid polymers - deoxyribonucleic acid and ribonucleic acid - which are both essential biomolecules in all life on Earth.

Nucleotides are the buildingblock of DNA and RNA. They are genetically encoded.

Nucleotides function as coenzymes, which are required for enzymes to catalyze many biochemical reactions. Our bodies store energy as ATP.

A nucleotide is made up of a sugar molecule (ribose in RNA or deoxyribose in DNA) linked to a phosphate group and a nitrogen-containing base including purines and pyrimidines.

The nucleotides are essential to living organisms because they are the building blocks of nucleic acids, which control all hereditarycharacteristics.

Thus, the correct option is E as all options are correct.

For more details regarding nucleotides, visit:

brainly.com/question/13185536

#SPJ2

The group of molecules called nucleotides contain phosphate groups, pyrimidines, purines, and pentose (a 5-carbon sugar). Therefore, E. all of the above is the correct answer.

Which shows the formula for an Organic acid

Answers

Answer:
The formula of Organic acid is as follow,

R-COOH

Explanation:
The class of organic acids is called Carboxylic Acids. In above general structure, R is alkyl group and can vary. While -COOH is the functional group.
Carboxylic Acids has the tendency to loose protons and their pKa value depends upon the alkyl group. For example the pKa value of Acetic acid (R = -CH₃) is 4.7. The driving force for this acidity is the stability of carboxylate (conjugate base) due resonance. i.e

RCOOH ⇄ RCOO⁻ + H⁺
Where;
RCOO⁻ = Carboxylate Ion (Conjugate base)

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