Answer:
21
Explanation:
P=2(l+w)=2·(8+2.5)=21
Hope this helps :)
How many moles of H20 are needed to produce 1 mole of O2 in the following equation?
2H2O + 2H2 + 102
Write the electron configuration for . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.)
The given question is incomplete. The complete question is:
Write the electron configuration for [tex]Ca^+[/tex] . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for [tex]Ca^{2+}[/tex] . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for [tex]Se^{2-}[/tex] . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for [tex]S^{2-}[/tex]. (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.)
Answer:
[tex]Ca^+:19:[Ar]4s^1[/tex]
[tex]Ca^{2+}:18:[Ar][/tex]
[tex]Se^{2-}:32:[Ar]3d^{10}4s^24p^2[/tex]
[tex]S^{2-}:18:[Ar][/tex]
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The electrons are filled according to Afbau's rule in order of increasing energies. The positively charged species are formed by loss of electrons and negatively charged species are formed by gain of electrons.
[tex]Ca:20:[Ar]4s^2[/tex]
[tex]Ca^+:19:[Ar]4s^1[/tex]
[tex]Ca^{2+}:18:[Ar][/tex]
[tex]Se:34:[Ar]3d^{10}4s^24p^4[/tex]
[tex]Se^{2-}:36:[Ar]3d^{10}4s^24p^6[/tex] or [tex]Se^{2-}:36:[Kr][/tex]
[tex]S:16:[Ne]3s^23p^4[/tex]
[tex]S^{2-}:18:[Ne]3s^23p^6[/tex] or [tex]S^{2-}:18:[Ar][/tex]
In an experiment, the molar mass of the compound was determined to
be 228.276 g/mol. What is the molecular formula of the compound? Please help!
thats ridiculously ridiculous
Answer: beautiful
Explanation:
How does nitrogen-fixing bacteria make nitrogen available to plants and animals?
Answer:
hi thxs for the points now bye
Answer:
Nitrogen-fixing bacteria in the soil and within the root nodules of some plants convert nitrogen gas in the atmosphere to ammonia. Nitrifying bacteria convert ammonia to nitrites or nitrates. Ammonia, nitrites, and nitrates are all fixed nitrogen and can be absorbed by plants.
Explanation:
Hope It Help
Newton's second law states that force is equal to
mass times weight
mass times acceleration
weight divided by mass
weight times acceleration
PLEASE PLEASE PLEASE HELP ASAP!!!
Which of the following is NOT considered evidence for plate tectonics? *
1 point
Earthquakes and volcanoes occur along specific zones.
Meteorite craters are found in various locations around the world.
The seafloor is separating along mid-ocean ridges.
The coastlines of South America and Africa seem to match up.
Answer:
It should be B
Explanation:
I hope this helps
What is the name of the anion in sodium carbonate?
Answer: Sodium salt
Explanation: sorry if this is wrong
A gas occupies 5.31 liters at a pressure of 0.55 atm. Determine the volume at standard pressure.
A. 2.92
B. 8.28L
C. 3.54 L
D. 9.65L
Answer:
Option A; V = 2.92 L
Explanation:
If we assume a lot of things, like:
The gas is an ideal gas.
The temperature is constant.
The gas does not interchange mass with the environment.
Then we have the relation:
P*V = n*R*T = constant.
Where:
P = pressure
V = volume
n = number of moles
R = constant of the ideal gas
T = temperature.
We know that when P = 0.55 atm, the volume is 5.31 L
Then:
(0.55 atm)*(5.31 L) = constant
Now, when the gas is at standard pressure ( P = 1 atm)
We still have the relation:
P*V = constant = (0.55 atm)*(5.31 L)
(1 atm)*V = (0.55 atm)*(5.31 L)
Now we only need to solve this for V.
V = (0.55 atm/ 1 atm)*(5.31 L) = 2.92 L
V = 2.92 L
Then the correct option is A.
What do these two changes have in common? Shaking up salad dressing. Adding dish soap to water in a sink
There are clouds forming over Florida. The temperatures in the clouds and in the air are above freezing. Which form of precipitation do you expect Florida to get and why?
Answer:
Rain
Explanation:
Clouds are formed from water vapor, which turns into ice when the temperature is below freezing, and falls as liquid rain water when temperatures are above freezing. Since the temperatures in the clouds and in the air are above freezing, rain will fall in Florida.
Answer:
Rain
Explanation:
What mass of lithium phosphate would you mass to make 2.5 liter of 1.06 M lithium
phosphate solution?
Answer:
Approximately [tex]3.06 \times 10^{2}\; \rm g[/tex] (approximately [tex]306\; \rm g[/tex].)
Explanation:
Calculate the quantity [tex]n[/tex] of lithium phosphate in [tex]V = 2.5\; \rm L[/tex] of this[tex]c = 1.06\; \rm M = 1.06\; \rm mol \cdot L^{-1}[/tex] lithium phosphate solution.
[tex]\begin{aligned}n &= c \cdot V\\ &= 2.5\; \rm L \times 1.06\; mol \cdot L^{-1}\\ &= 2.65\; \rm mol\end{aligned}[/tex].
Empirical formula of lithium phosphate: [tex]\rm Li_3PO_4[/tex].
Look up the relative atomic mass of [tex]\rm Li[/tex], [tex]\rm P[/tex],and [tex]\rm O[/tex] on a modern periodic table:
[tex]\rm Li[/tex]: [tex]6.94[/tex].[tex]\rm P[/tex]: [tex]30.974[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].Calculate the formula mass of [tex]\rm Li_3PO_4[/tex]:
[tex]M(\rm Li_3PO_4) = 3 \times 6.94 + 30.974 + 4 \times 15.999 = 115.79\; \rm g \cdot mol^{-1}[/tex].
Calculate the mass of that [tex]n = 2.65\; \rm mol[/tex] of [tex]\rm Li_3PO_4[/tex] formula units:
[tex]\begin{aligned}m &= n \cdot M \\ &= 2.65\; \rm mol \times 115.79\; \rm g\cdot mol^{-1} \\ &\approx 3.06 \times 10^{2}\; \rm g \end{aligned}[/tex].
Why does our body need to use both mechanical and chemical digestion when we are breaking down our food?
Answer:
Chemical digestion is a vital part of the digestive process. Without it, your body wouldn't be able to absorb nutrients from the foods you eat, also chemical digestion uses enzymes to break down food
mechanical digestion involves physical movements, such as chewing and muscle contractions,
Explanation:
An airplane flew 3043 km from Houston to Seattle in 5.5 hours. What was the average speed, in m/s rounded to the nearest hundredth, of the airplane from Houston to Seattle?
An airplane flew 3043 km from Houston to Seattle in 5.5 hours. What was the average speed, in m/s rounded to the nearest hundredth, of the airplane from Houston to Seattle?
The answer is 553
Answer:
553
Explanation:i did this question today and it was right!
Features passed from parent to offspring, such as eye color, is an example of what?
help plz ill give extra points
Answer: i think its d sorry if im wrong
Explanation:
4. Did you know that the polar bear has black fur? Why does it look like it has white fur?
HELP!!!!!
24. Explain what happens at the particle level when a solid melts.
Answer:
When a solid is heated the particles gain energy and start to vibrate faster and faster. ... At this point the solid is melting to form a liquid. The particles in the liquid are the same as in the solid but they have more energy.
Explanation:
sana maka help
this organ has 2 parts, the cervix, which is the lower part that opens into the vagina, and the main body, called the corpus.
Answer:
The correct answer is - the uterus.
Explanation:
The uterus or the womb is an organ that appears to be pear-shaped and it is hollow from inside where the fetus is developed and it is also called the birth canal. The uterus has two parts one is the cervix and the other is the corpus.
The cervix makes the lower part of the uterus and opens up into the vagina the external reproductive organ of the females. The corpus is the part that makes the main body of the uterus. The uterus is present between the bladder and rectum where the egg fertilized and implanted itself.
True or False: Air pollution contributes to global warming.
A. True
B. False
The temperature of water decreases on the dissolution of NH4NO3. From this observation, we can conclude that the solution process would be best described asa)exothermic with a positive entropy change.b)exothermic with a negative entropy change.c)endothermic with a negative entropy change.d)endothermic with a positive entropy change.e)exothermic with a negative free energy change
Answer: d)endothermic with a positive entropy change
Explanation:
Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
As temperature of water decreases on dissolution of [tex]NH_4NO_3[/tex] , it means heat has been absorbed by [tex]NH_4NO_3[/tex] during dissolution and that heat is taken from water. Thus process is endothermic. As dissolution will lead in the formation of ions [tex]NH_4^+[/tex] and [tex]NO_3^-[/tex] , randomness will increase and thus there is a positive entropy change.
Match it, I’m not sure which category they go in
Answer:
Endothermic is something that needs heat added into it, while exoteric gives heat off
Explanation:
1. Endo(Melting ice)
2. Endo(heat enters the system)
3. Exothermic(making ice)
4. Endothermic( liquid to gas)
5. Exothermic(campfire)
6. exothermic(gas to a liquid)
7. Exothermic (the flame of a candle)
8. Exothermic (heat leaves the system)
9. I don’t know if photosynthesis is exo or endothermic
answer with explanation and you’ll get brain list
Answer:
Option D.
Explanation:
6H₂ + P₄ → 4PH₃First we convert the given reactant masses into moles, using their respective molar masses:
4.00 g H₂ ÷ 2 g/mol = 2 mol H₂6.20 g P₄ ÷ 124 g/mol = 0.05 mol P₄0.05 moles of P₄ would react completely with (6*0.05) 0.3 moles of H₂. There are more H₂ moles than required, meaning H₂ is in excess and P₄ is the limiting reactant.
Now we calculate how many PH₃ moles could be formed, using the number of moles of the limiting reactant:
0.05 mol P₄ * [tex]\frac{4molPH_3}{1molP_4}[/tex] = 0.2 mol PH₃Finally we convert 0.2 mol PH₃ into grams, using its molar mass:
0.2 mol PH₃ * 34 g/mol = 6.8 gSo the correct answer is option D.
Calculate the value of Kp at 227°C for the equilibrium: 3 A(g) ⇌ B(g) + D(g) Kc = 5.15
a. 7.52
b. 0.125
c. 96.0
d. 0.0653
e. 276
Calculate the formula weight or molecular for the following:
a. LiCI
b. SO2 (The 2 is in subscript)
Answer:
42.39, 64.06
Explanation:
Formula Weight can be calculated by adding the atomic mass of the elements in the formula.
LiCl
AM for Li is 6.94 amu, AM for Cl is 35.45 amu
[tex](6.94)+(35.45)=42.39[/tex]
SO₂
AM for S is 32.06 amu, AM for O is 16 amu
[tex](32.06)+2(16.00)=64.06[/tex]
why does ocean water found near the poles often have a higher leaves of salinity than ocean water found near the equator
The ocean water found near the poles has a higher level of salinity because the area of rain reduces as one moves toward the poles, and as a result of less rain and more sunshine, evaporation increases.
What is salinity?Salinity is the presence of salt in the water. Freshwater bodies have very less amount of salt, but ocean water has a large amount of salt dissolved in it.
Because cold polar air cools the water and decreases its temperature, raising its salinity, water close to the poles frequently has more salinity. When fresh water freezes out of seawater to form sea ice, the salinity of the remaining water likewise rises.
Therefore, as one travels toward the poles, the area of rain decreases, and as a result of less rain and more sunshine, evaporation increases, and the ocean water there has a higher level of salinity.
To learn more about salinity, refer to the link:
https://brainly.com/question/11798887
#SPJ2
If a candy bar contains 345 Calories, how many calories is this?
Answer: 345,000 calories
Explanation:
Calories in food such as candy bars refer to the amount of energy that the food has. Calories are also called Kilocalories because they are the equivalent of 1,000 calories.
If the candy bar contained 345 calories therefore, and 1 Calorie is 1,000 calories, the calories in the candy bar are:
= 345 * 1,000
= 345,000 calories
Are real or ideal gases used in labs?
(04.04 MC)
Which table best shows the impacts resulting from human activity? (6 points)
Answer:
B
Explanation:
Answer:
B its correct because i did the test.
Explanation:
When 2 equal forces act on and object and the object generally doesn't move is
A. interia
B. unbalanced force
C. balanced force
D. speed
Answer:
a balanced force since the object isn't moving
hope this helped