Answer:
I think it is D. It allows you to compare the properties of the elements. I might be wrong.
The image seen here is caused by events __________ Earth's surface.
A) above
B) at
C) on
D) under
From which area of the periodic table are
you likely to find semiconductors? Explain.
Periodic tables arrange and group the periodic element based on their similar properties and atomic number. Semiconductors are most likely to be found in columns IV and VI of the periodic table.
What are semiconductors?Semiconductors are solid substances defined by the property and ability to conduct the charge and heat. They show the property of conductivity and have been comprised mostly of metals. They are able to show conductivity due to electrical properties.
Semiconductors are mostly found in groups IV and VI of the periodic table; and comprises mainly of tin (Sn), silicon (Si), tellurium (Te), germanium (Ge), and selenium (Se). These elements are used in transistors and diodes to conduct electricity.
The element is semiconductors only if they have more and fewer electrons in their outer valence shell of the atom so that they can be n or p-type semiconductors. They are majorly used in electronic devices.
Therefore, columns IV and VI of the periodic table are comprised of semiconductors.
Learn more about semiconductors, here:
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What is an orbital? This is the question.
Answer:
A atomic orbital is a mathematical function describing the location and wave-like behavior of an electron in an atom.
Explanation:
Have a great day :)
Weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Please help with the chart
Answer:
no
Explanation:
True or False: Cohesion is the attraction between particles of the same
substance
Answer: True
Explanation:
The third law of thermodynamics states that:_____.
a. the entropy of the universe equals the sum of the entropy of system and that of the surroundings.
b. the entropy of the universe is constant.
c. the entropy is zero at 0 K for a perfect crystal.
d. the entropy of the universe is increasing.
e. the absolute entropy of a substance decreases with increasing temperature.
Answer:
C
Explanation:
The third law of thermodynamics states that at absolute zero temperature, the entropy of a perfect crystal is zero. In other words, as the temperature of a system approaches zero, the entropy also approaches a constant value.
The law only holds true only if the crystal has minimal energy and only exist in one state. The entropy becomes zero as the temperature also becomes zero only for a perfect crystal. Otherwise, the law refuses to hold.
The correct option is, therefore, C.
What are capacitors used for
This item is used for small cuts and peeling.
1-Chef Knife
2-Pizza Cutter
3-Kitchen Shears/Scissors
4-Paring Knife
In an industrial process ethanol C2H60 burns with O2 to produce heat. Each mole of ethanol produces 8842 joules during the reaction.
C2H5OH (1) + 3 O2(g) 2 CO2(g) + 3 H2O(0) + 8842 Joules
How many Kilojoules are obtained from burning 982.6 g of ethanol?
Answer:
[tex]189kJ[/tex]
Explanation:
Hello!
In this case, since one mole of ethanol release 8,842 J per 1 mole of ethanol, we can write:
[tex]\frac{8,842J}{1molC_2H_6H}[/tex]
Thus, since we need the energy released by 982.6 g of ethanol, we compute the moles in such mass of fuel:
[tex]n=982.6g\frac{1mol}{46.08g} =21.3mol[/tex]
Therefore, the result is:
[tex]\frac{8,842J}{1mol}*21.3mol=188,545J[/tex]
Which in kJ is:
[tex]189kJ[/tex]
Best regards!
Please help me with this chem question
Answer:
D
Explanation:
A and C are physical changes, while B is a solution, only D is a chemical reaction.
I need hlep with this question
Answer:
yes its what the other person said
Explanation:
Need help with this please thanks
Answer: 1. [tex]2H_2+O_2\rightarrow 2H_2O[/tex]
2. [tex]P_4+3O_2\rightarrow 2P_2O_3[/tex]
3. [tex]N_2+3H_2\rightarrow 2NH_3[/tex]
4. [tex]2K+Cl_2\rightarrow 2KCl[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The given equations are balanced as:
1. [tex]2H_2+O_2\rightarrow 2H_2O[/tex]
2. [tex]P_4+3O_2\rightarrow 2P_2O_3[/tex]
3. [tex]N_2+3H_2\rightarrow 2NH_3[/tex]
4. [tex]2K+Cl_2\rightarrow 2KCl[/tex]
Can someone help me and explain why they got what they got?
Answer:
24.32 amu
Explanation:
From the question given above, the following data were obtained:
Isotope A (Mg–24):
Mass of A = 24 amu
Abundance (A%) = 79%
Isotope B (Mg–25):
Mass of B = 25 amu
Abundance (B%) = 10%
Isotope C (Mg–26):
Mass of C = 26 amu
Abundance (C%) = 11%
Average atomic mass of Mg =?
Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
= [(24 × 79)/100] + [(25 × 10)/100] + [(26 × 11)/100]
= 18.96 + 2.5 + 2.86
= 24.32 amu
Thus, the average atomic mass of Mg is 24.32 amu
Suggest a possible mechanism for the acid catalyzed reaction of a typical ketohexose to give 5-hydroxymethylfurfural.
Answer:
See explanation
Explanation:
Taking the acid catalysed hydrolysis of fructose C6H12O6, the mechanism begins with the protonation of an -OH group as shown.
This is now followed by dehydration and formation of a keto-enol tautomer. The keto form is now dehydrated followed by the protonation of a second -OH group.
A second dehydration followed by deprotonation leads to the formation of 5-hydroxymethylfurfural.
Image credit: SciElo
what is the volume of 18.9 g of a liquid that has a density of 0.956 g/ml
a gas occupies 600.0 ml at 20.00 degrees C and 70.00kPa what will be the pressure at 40.00 degrees C and 150.0mL?
Answer:
P₂ = 299.11 KPa
Explanation:
Given data:
Initial volume = 600 mL
Initial pressure = 70.00 KPa
Initial temperature = 20 °C (20 +273 = 293 K)
Final temperature = 40°C (40+273 = 313 K)
Final volume = 150.0 mL
Final pressure = ?
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
P₂ = P₁V₁ T₂/ T₁ V₂
P₂ = 70 KPa × 600 mL × 313 K / 293K ×150 mL
P₂ = 13146000 KPa .mL. K /43950 K.mL
P₂ = 299.11 KPa
The observed cell potential for a voltaic cell is 2.067 V when the temperature is 298 K and the concentration of copper(ll) ions is 1.07 M. What is the concentration of aluminum ions in this cell?
Al(s)|A13+ (aq, ?M)||Cu2+(aq, 1.07M)|Cu(s)
Cu2+(aq) + 2 e- → Cu(s) 0.337 V
Al3+(aq) + 3 e- → Al(s) -1.66 V
Answer:
3.22 * 10^-4 M
Explanation:
The cell reaction equation is;
2Al(s) + 3Cu^2+(aq) ------> 2Al^3+(aq) + 3Cu(s)
E° = 0.337 V - (-1.66 V)
E° = 1.997 V
Given that the cell potential is 2.067 V, from Nernst's equation;
E = E° - 0.0592/n log Q
Substituting values;
2.067 = 1.997 - 0.0592/6 log [Al^3+]^2/[1.07]^3
0.07 = - 0.0592/6 log [Al^3+]^2/[1.07]^3
- 7.07 = log [Al^3+]^2/[1.07]^3
Antilog (- 7.07) = [Al^3+]^2/[1.07] ^3
8.5 * 10^-8 = [Al^3+]^2/[1.07]^3
[Al^3+]^2 = 8.5 * 10^8 * 1.07 ^3
[Al^3+]^2 = 1.04 * 10^-7
[Al^3+] = √1.04 * 10^-7
[Al^3+] = 3.22 * 10^-4 M
Can someone answer 5 for me please?
Answer:
D
Explanation:
D
In parts of England during the 19th century, the peppered moth was widespread. This kind of moth comes in two color variations, cream and gray. Prior to the Industrial Revolution, cream-colored moths were more common. However, after the Industrial Revolution, the population of gray-colored moths was found to be larger than that of cream-colored moths. What was most likely the reason for the increase in the number of gray moths? A. Cream moths were resistant to environmental changes during the Industrial Revolution. B. Gray moths were not affected by the Industrial Revolution. C. Changes during the Industrial Revolution increased the chance of survival and reproduction for gray-colored moths. D. Changes during the Industrial Revolution increased the chance of survival and reproduction for cream-colored moths.
Answer:
C
Explanation:
the gray moths were able to hide better in the smoky air then cream colored moth and were able to stay alive.
Answer:
C
Explanation:
During the industrial revolution the grey moths could blend in more and have more camouflaged then the crème colored moths, that being said they had a better chance of reproduction and became more populated afterwards. hope this helps! :)
PLEASE HELP I DONT WANT TO FAIL!! ):
Cesium Bromide and Strontium Nitrate react to form Strontium Bromide and Cesium Nitrate.
a. Write out the word equation representing this reaction
b. Write out the skeletal equation representing this reaction
c. Write out the balanced equation representing this reaction
Which of the atoms below are least likely to violate the octet rule?
Answer:
F i think i pretty sure F!!!!!!!!
which characteristic of a strong acid
Answer:
It ionizes completely in solution
Explanation:
The main characteristics of a strong acid is that it ionizes completely in solution. A strong acid will produce hydroxonium ions in solution.
A weak acid does not ionize completely in solution. Their ionization is very small and most times, the exists in equilibrium phase with the product formed.
A weak base also ionizes partially in solution.
A weak acid does not ionize completely in a given solution and it exists in equilibrium with the product.
The actions of strong acids are usually fast.
Pro
∆G0=-RT in k Known as
Answer:
Gibbs free energy equation
Explanation:
Which of the following is a homogeneous mixture
O air
O silicon
O nickel
chocolate chip cookies
Answer:
silicon or air or nickel or chocolate chip cookies i think
Explanation:
Which statements correctly compare the masses of protons neutrons and electrons
Which option describes a phase change?
OA. Plasma erupting from the sun
DB. A helium balloon rising into the sky
OC. Gasoline evaporating into the air
Air leaking from a tir
I apologize of I'm wrong but its probably OA
Sorry once again!
~wise rat
Answer: C.
Explanation:
gasoline evaporating into the air
Humans have 50 pairs of chromosomes true or false
Answer:
False
Explanation:
humans have 23 pairs
Why is a “spark” of energy required to begin the chemical reaction of burning a fossil fuel? What is another name for this spark of energy?
Answer: a burst
Explanation: a burst of energy could be substatuded for spark of energy
A spark of energy is required to begin the chemical reaction of burning a fossil fuel because; This spark of energy is required to attain the activation energy of the reaction.
Another name for this spark of energy is Ignition.
Definition:
The activation energy of a chemical reaction is the minimum amount of energy required for the commencement of the chemical reaction.
In this case, the spark of energy is required to attain the activation energy of the reaction.
Read more:
https://brainly.com/question/7639475
What is the final pressure of 1.00 mol of ammonia gas, initially at 1.00 atm, if the volume is:___________.
a. gradually decreased from 78.0 mL to 39.0 mL at constant temperature.
1) 2.00 atm
2) 1.00 atm
3) 0.50 atm
4) Not enough data
b. increased from 43.5 mL to 65.5 mL at constant temperature.
c. decreased by 40% at constant temperature.
Answer:
The correct answer is a = 2 atm, b = 0.66 atm, and c = 1.66 atm.
Explanation:
a. When the temperature is constant, the ideal gas equation, that is, PV = nRT becomes PV = constant, or P1V1 = P2V2
Based on the given information, the pressure of the gas is 1.00 atm, the V1 of the gas is 78 ml, and the V2 of the gas is 39 ml.
Now using the above formula we get,
P2 = (P1V1) / (V2)
P2 = 1 atm * 78 ml/39 ml
P2 = 2 atm.
b) Now the volume V1 is 43.5 ml, and the volume V2 is 65.5 ml at constant temperature, P1 is 1 atm. Now P2 will be,
P2 = (P1V1) / (V2)
P2 = 1 atm * 43.5 ml/65.5 ml
P2 = 0.66 atm
c) In the given case, when the volume is decreased by 40 percent, let us consider that the volume, V1 be 100 ml, and the volume V2 be 60 ml, the P1 is 1 atm, now the P2 will be,
P2 = (P1V1) / (V2)
P2 = 1 atm * 100 ml/60 ml
P2 = 1.66 atm.