Answer:
A Carbon
Explanation:
The half-life of a certain element is 100 days. How many half-lives will it be before only one-fourth of this element
remains?
4
50
25
2
How does the Pauli exclusion principle affect orbital filling? Give an example of a 2p orbital diagram for which Paul Exclusion principle is violated.
Pauli's exclusion principle states that no two subshells of same element have same 4 quantum numbers.
Take example of Berrilim orbital
Electronic configuration is given by 1s²2s²
But the orbital is
[tex]\\ \rm\Rrightarrow \huge{\boxed{\uparrow\downarrow}}\:\:\huge{\boxed{\uparrow\downarrow\mid\:\:\:\:\mid\:\:\:}}[/tex]
In relation to us, galaxies are doing what?
Answer:
Moving away from us
Explanation:
I believe this is the answer. Sorry if it's incorrect, I'm not very good in this subject.
what is the chemical formulae for lime water
Answer:
The formula for lime water is Ca(OH)2 and the chemical name for lime water is calcium hydroxide.Explanation:
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[tex]\\ \purple{MaggieEve}[/tex]
When assessing solutions to problems involving our water systems, what needs to be considered
Answer:
Virtually every industry in the world anticipates sweeping systemic transformation over the next decade in their strategic planning, production practices, and business models, according to the Sustainability Survey Poll on Water. The global opinion poll, which released a survey of more than 1,200 sustainability experts in March, concludes that water shortages will shift public perception of the value of water, prompting governments and companies to view clean water not as a commodity to exploit but as a precious resource.Conducted by GlobeScan, an international public and stakeholder opinion research firm, and SustainAbility, a think tank and business strategy consultancy, the poll asked, “What are the technologies or changes in behavior which show the most promise for addressing water shortages over the next 10 years?” The experts’ responses generated 19 consensus solutions.
Explanation:
Natalia's group comes up with three different solutions:
.
Scoop the oil up with a spoon.
.
Absorb the oil with a paper towel.
• Use soap to break up the oil.
Evaluate each solution for its potential to remove the oil. For each solution, consider the following:
What is the scientific reasoning that supports this solution?
.
• How effective do you think this solution will be?
.
If scientists implemented this solution to clean up a large oil spill in the ocean, what possible effects
would it have on the ecosystem?
The best approach would be to use soap to break up the oil since the soap is biodegradable and has no effect on the environment.
What is a clean up effort?A clean up effort is a deliberate effort to recover the environment after an environmental hazard has occurred such as an oil spill.
In carrying out a clean up exercise, we seek for the most environmentally friendly approach.
In this case, the best approach would be to use soap to break up the oil since the soap is biodegradable and has no effect on the environment.
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Which of the following is an oxidation half reaction
Answer:
Sn²⁺ → Sn⁴⁺ + 2e⁻
Explanation:
Answer:
The answer is..
Sn²⁺ → Sn⁴⁺ + 2e⁻
I hoped this helped, please let me know if it isn't the right answer btw. :)
Have a wonderful day!
1. What makes a "fluorescent" highlighter marker so bright?
2. How does plasma make a campfire flame orange?
3. Why are crystals rare?
Answer:
1. What makes a "fluorescent" highlighter marker so bright?
When light of a certain wavelength is directed at the molecule's chromophore, a photon is absorbed and excites an electron to a higher energy state. Fluorescent highlighter ink is unusually bright because it converts some of the incident ultraviolet light that is invisible to humans into visible light.
2. How does plasma make a campfire flame orange?
The de-excitation of plasma (charged gas) is not the source of the light given off by a campfire's flame. The incandescence of solid soot particles billowing up on an updraft of hot air is what creates the light seen as a flame.
3. Why are crystals rare?
The answer is twofold: erosion and mixed composition. Wind, rain, and water flow have a way of knocking and mixing around things here on earth
Answer:
1: When light of a certain wavelength is directed at the molecule's chromophore, a photon is absorbed and excites an electron to a higher energy state. Fluorescent highlighter ink is unusually bright because it converts some of the incident ultraviolet light that is invisible to humans into visible light.
2: The de-excitation of plasma (charged gas) is not the source of the light given off by a campfire's flame. The incandescence of solid soot particles billowing up on an updraft of hot air is what creates the light seen as a flame.
3: erosion and mixed composition. Wind, rain, and water flow have a way of knocking and mixing around things here on earth. This erosion causes big crystals such as a palm-sized amethyst to get knocked apart into little crystals.
if it has a high temp but a low pressure does it dissolve faster than a high pressure and a low temperature
Answer:
it dissolve faster in higher temperature hope it's right
HELP ON THIS ASAP!!! During which era did fish evolve?
A:The Mesozoic era
B:The Cenozoic era
C:The Paleozoic era
Or D:The Precambrian era
Two different shaped containers have the same pressure, temperature and volume. What else must be true?
Answer:
n, the number of moles of gas is the same
Explanation:
PV = n RT if P and V and T and R are the same , the n must be the same
n = numer of moles
The representative particle for gaseous nitrogen is the ____.
Answer:
The representative particle for gaseous nitrogen is theMolecule.A sample of gas starts at 1.00 atm, 0.00 degrees Celsius, and 30.0 mL. What is the
volume if the temperature increases to 27.0 degrees Celsius and the pressure increases to
2 atm?
Answer:
pV= nRT
Explanation:
(p1 × V1)/ T1/ (p2 × V2)/ T2
Energy can come in many different forms such as mechanical energy, sound energy, electromagnetic energy, thermal energy, chemical energy, and nuclear energy.
15 Energy is measured in units called __________
Answer:
Explanation:
Energy can come in many different forms such as mechanical energy, sound energy, electromagnetic energy, thermal energy, chemical energy, and nuclear energy.
15 Energy is measured in units called __________
A 10 cm3 piece of aluminum has a higher density than a 5 cm3
of aluminum. True or false
Answer:
Explanation:
No density does not change when the volume changes unless something is added to the 5 cm^3.
The answer is False
5CH4
How many atoms
C=
H=
Answer:
carbon aroms are 5
hydrogen atoms are 20
What is the molarity of a solution that contains 25 g of hcl in 150 ml of solution? (the molar mass of hcl is 36.46 g/mol.) what should you find first?
Answer: 4.6 M
Explanation:
Converting 25 g of HCl to moles, we get 25/36.46 = 0.68568294020845 moles.
Also, 150 mL = 0.150 L
So, the concentration is:
[tex]\frac{0.68568294020845}{0.150} =\boxed{4.6 \text{ M}}[/tex]
Answer:
Part 1. First, you find the Moles.
Part 2. The correct setup for finding the moles is: 25g HCI x 1mol HCI/36.46g HCI
Part 3. The correct setup to find liters is: 150 mL x 1L/1000mL
Part 4. The molarity of this solution is: 4.6 M HCI
Explanation:
just listen lol
Which of the following is true about processes that shape the Earth?
Some processes that shape the Earth are happening so slowly they cannot be easily detected in a human's lifetime.
What is the Earth?This is the third planet from the Sun and is characterized by its plants and animal life.
This planet have some processes which occur slowly and aren't easily detected unlike the rapid ones.
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Why does the equilibrium of a system shift when the pressure is decreased?
To maximize the stress on the system
To stop restoring equilibrium to the system
To increase the total moles of gas in the system
To decrease the total moles of gas in the system
When the equilibrium of a system shift to increase the total moles of gas in the system, when the pressure is decreased.
What is equilibrium law?Equilibrium law states that when any external stress is applied on the equilibrium state of the reaction then reaction will shift towards that side where external stress decreases.
Relation between pressure and moles of gas is directly proportional to each other. So when pressure is decreased then to maintain the equilibrium total moles of the gas of the system will increases as a result of which pressure increases.
Hence, equilibrium shift to increase the total moles of gas in the system.
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Answer: to maximize the stress on the system
Explanation: i took the test
Select the correct answer from the drop-down menu. of all the sunny club members in a particular city, 25% prefer swimming on weekends and 75% prefer swimming on weekdays. it is found that 10% of the members in that city prefer swimming on weekends and are female, while 55% of the members in that city prefer swimming on weekdays and are female. the probability that a club member picked randomly is female, given that the person prefers swimming on weekends, is .
Based on the percentage of people that prefer to swim on weekends, the probability that a female who prefers swimming on weekends is picked is 0.40.
What is the probability of a female weekend swimmer being randomly picked?This can be found by the formula:
= Percentage of females who prefer swimming on weekends / Percentage of those who swim on weekends
Solving gives:
= 10% / 25%
= 0.40 or 40%
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What natural processes can contribute to acid rain
Answer:
The major natural causal agent for acid rain is volcanic emissions. Volcanoes emit acid-producing gases to create higher than normal amounts of acid rain or any other form of precipitation such as fog and snow to an extent of affecting vegetation cover and health of residents within the surrounding.
a woman put her clothes in the dryer.There is a mix of wool and cotton. After the dryer is finished wool clothes and cotton clothes are stuck together. There's no wool stuck to wool or cotton stuck to cotton.using laws of charge, explain why this is the case
Answer:
Explanation:
Explanation
There is a Plus charge on one of them (I think it is likely the wool).
There is a minus charge on the other one (So it is cotton most likely.
The point is that like charges repel (move away from each other)
Unlike charges attract. (move close to each other.)
You have a case of unlike charges attracting.
Green plants are primary consumers. True False
Answer:
The answer is False beacuse, plant are called producers because they make their own food.
Convert these temperatures to Celsius:
a. 303 K
d. 45 K
303K − 273.15 = 29.85°C
45K − 273.15 = -228.1°C
Type the correct answer in the box. express your answer to three significant figures. the gas inside a large engine cylinder initially has a pressure of 105 kilopascals and a volume of 2.031 liters. if the gas is compressed at constant temperature to a volume of 0.356 liter, what is its new pressure? the pressure of the compressed gas is kilopascals.
The new pressure of the gas would be 599.03 kilopascals
Boyle's lawsBoyles postulated that the pressure of any gas would be inversely proportional to its volume if the temperature of the gas remains unchanged.
Mathematically: P1V1 = P2V2
In this case, P1 = 105 kilopascals, V1 = 2.031 liters, V2 = 0.356 liters.
P2 = P1V1/V2 = 105 x 2.031/0.356 = 599.03 kilopascals
Thus, the new pressure will be 599.03 kilopascals.
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Answer: 599
Explanation:
cuz i got the answer right on the test
the number of nucleons of an isotope represents the total number of..
Answer:
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.
4. At least one carbon-carbon bond in an alkyne is a triple covalent bond. Other bonds may be single or double carbon-carbon bonds and carbon-hydrogen bonds.
Answer:
hope it helps cuz i did not really understand
Proteins are synthesized in which organelle?
Question Options:
A: nucleus
B: ribosomes
C: mitochondria
D: chloroplasts
Protein are synthesized by ribosome. The correct option is B, ribosome.
What is ribosome?Ribosomes are small spherical organs that are present in the cytoplasm. They are the main site of protein synthesis.
They consist of RNA and associated protein. They link amino acid together by the order of codons given by messenger RNA.
Thus, the correct option is B: ribosomes.
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Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium? oxygen lithium oxide right arrow. lithium lithium oxygen right arrow. lithium oxide oxygen lithium right arrow. lithium oxide lithium oxide right arrow. lithium oxygen
The equation of the reaction for the formation lithium oxide from lithium and oxygen is given as:
[tex]2Li + O_2 \rightarrow Li_2O[/tex]
What is the equation for the formation of Lithium oxide?Lithium oxide is a compound formed from the reaction between lithium and oxygen.
The equation for the chemical reaction is given below:
[tex]2Li + O_2 \rightarrow Li_2O[/tex]
Therefore, the reaction between lithium and oxygen yields lithium oxide.
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Fe2O3 (s) + 3CO (g) -----> 2Fe (l) + 3CO2 (g)
How many moles of Fe2O3 must react to produce 760 kg of Fe? (please tell me how you get the answer...)
The number of moles of Fe₂O₃ that must react to produce 760 kg of Fe are 20.503
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The reaction is [tex]\rm Fe_2O_3 (s) + 3CO (g) ----- > 2Fe (l) + 3CO_2[/tex]
The mass of Fe is given 760 kg
The molar mass of Fe is 55.9 g/mol
To calculate the number of moles
[tex]n = \dfrac{m}{M} \\\\n = \dfrac{760000}{55.9 g/mol} = 13,669[/tex]
Now, the ratio between Fe and O is 2 : 3
[tex]\dfrac{13,669}{2} \times 3 = 20,503.5[/tex]
convert it into kg = 20.503 mol
Thus, the moles are 20.503 mol
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