Answers
Answer:
(b) A and C belongs to same group.
(c) D is a non metal.
Explanation:
The Electronic Configuration of E is
[tex]1s {}^{2} 2s {}^{2}2p {}^{6} 3s {}^{2} 3p {}^{6} 4s {}^{2} [/tex]
Related Questions
D. Answer these questions.
1. What is chemistry?
2. What is scientific method?
Answers
Answer:
1.Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
2.The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observations.
2.A helium-filled balloon has a
volume of 48.0 L at 25°C and
1.05 atm. What volume will it
have at 0.860 atm and 15°C?
Answers
Answer:
The volume at 0.860 atm and 15°C will be 56.638 L
Explanation:
Gay Lussac's law explains the variation in the pressure of a gas by modifying its temperature, keeping the volume constant: it determines that pressure and temperature are directly proportional quantities. In other words, Gay-Lussac's law states that when a gas undergoes a constant volume transformation, the ratio of the pressure exerted by the temperature of the gas remains constant:
[tex]\frac{P}{T}=k[/tex]
On the other hand, Boyle's law determines that the pressure exerted by a gas is inversely proportional to its volume at constant temperature. This is expressed mathematically as:
P*V=k
Finally, Charles's law says that at constant pressure, the volume of an ideal gas is directly proportional to its absolute temperature and is expressed mathematically as:
[tex]\frac{V}{T}=k[/tex]
Combined law equation is the combination of three gas laws called Boyle's, Charles's and Gay-Lussac's law:
[tex]\frac{P*V}{T}=k[/tex]
When you want to study two different states, an initial one and a final one of a gas, you use:
[tex]\frac{P1*V1}{T1}=\frac{P2*V2}{T2}[/tex]
In this case:
P1= 1.05 atmV1= 48 LT1= 25 C= 298 K (being 0 C= 273 K)P2= 0.86 atmV2= ?T2= 15 C= 288 KReplacing:
[tex]\frac{1.05 atm*48 L}{298 K}=\frac{0.86atm*V2}{288 K}[/tex]
and solving:
[tex]V2=\frac{288 K}{0.86 atm} *\frac{1.05 atm*48 L}{298 K}[/tex]
you get:
V2= 56.638 L
The volume at 0.860 atm and 15°C will be 56.638 L
What is the volume occupied by 2.34 grams of CO2 gas at STP?
Answers
Answer:
The volume occupied by 2.34 grams of CO2 gas at STP is 1.18 L
In human cells, a dynamic equilibrium exists between carbonic acid (H2CO3) and carbon dioxide (CO).
H2CO3(aq) = CO2() + H200
When a person exercises, the body's cells metabolize glucose to gain energy. This metabolism also causes an increase in the
concentration of carbon dioxide.
Le Chatelier's principle states that stresses applied to a system in dynamic equilibrium will cause the system to change in order to
alleviate those stresses. According to this principle, how would an increase in carbon dioxide concentration affect the system?
A. There would be a decrease in the concentration of carbonic acid.
В. There would be an increase in the concentration of glucose.
C. There would be an increase in the concentration of water.
There would be an increase in the concentration of carbonic acid.
D There would be an increase in the concentration of carbonic acid.
Answers
There would be an increase in the concentration of carbonic acid - this is how an increase in carbon dioxide concentration influences the system.
What is dynamic equilibrium?In chemistry, a dynamic equilibrium lives once a reversible reaction occurs. Substances transition between the reactants and products at equal rates, indicating there is no net change. Reactants and products exist formed at such a rate that the concentration of neither changes. It is a precise example of a system in a steady state. After a time, a reversible reaction in a closed system can get what we call a dynamic equilibrium.
The correct answer is option D.
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HELP ASAP! 50 POINTS! Which type of electromagnetic radiation has a longer wavelength than visible light? (4 points) Gamma rays Infrared radiation Ultraviolet radiation X‒rays
Answers
Answer:Infrared radiation
Explanation:just took the test
The electromagnetic radiation that has a longer wavelength than visible light is Infrared radiation.
The electromagnetic spectrum is an arrangement of of electromagnetic waves in order of increasing frequency and energy. We must note the longer the wavelength, the farther it appears towards the left in the electromagnetic spectrum.
The visible spectrum spans between 400 nm - 700 nm in the electromagnetic spectrum. The electromagnetic radiation that has a longer wavelength than visible light is Infrared radiation.
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The gases in a hair spray can are at a temperature of 27oC and a pressure of 30 lbs/in2. If the
gases in the can reach a pressure of 90 lbs/in2, the can will explode. To what temperature must
the gases be raised in order for the can to explode? Assume constant volume. Show your work.
Answers
Using Gay Lussac's Law
[tex]\boxed{\sf \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}}[/tex]
[tex]\\ \sf\longmapsto \dfrac{30}{27}=\dfrac{90}{T_1}[/tex]
[tex]\\ \sf\longmapsto T_1=\dfrac{90\times 27}{30}[/tex]
[tex]\\ \sf\longmapsto T_1=81°C[/tex]
Key Notes:-Gay Lussac's Law:-
It states that at constant volume (V),The pressure(P) of fixed amount of gas caries directly with its absolute temperature(T).
[tex]\\ \sf\longmapsto P\propto T[/tex]
[tex]\\ \sf\longmapsto \dfrac{P}{T}=Constant[/tex]
[tex]\\ \sf\longmapsto \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
[tex]\\ \sf\longmapsto P_1T_2=P_2T_1[/tex]
The final temperature of the gases with 90 lbs/in² is equal to 627°C assuming the volume is constant.
What is Gay Lussac's law?Gay-Lussac's law can be described as if the volume (V) of the gas remains constant then the pressure (P) is directly proportional to the absolute temperature (T) of the gas.
Gay Lussca's law in mathematical expression can be represented as:
P/T = k
It can be also represented as the pressure (P) being directly proportional to the temperature (T).
P ∝ T ( V of gas is constant)
or, P₁/T₁ = P₂/T₂
Given, the initial temperature of the gas, T₁ = 27°C = 27 + 273 = 300 K
The initial pressure of the gas, P₁ = 30 lbs/in²
The final pressure of the gas, P₂ = 90 lbs/in²
The final temperature of the gases in a hair spray can be determined as:
[tex]{\displaystyle \frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]
[tex]{\displaystyle T_2 =\frac{P_2\times T_1}{P_1}[/tex]
[tex]{\displaystyle T_2 =\frac{90\times 300}{30}[/tex]
T₂ = 900 K = 900 - 273
T₂ = 627°C
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Which statements describe a good hypothesis? Check all that apply.
A good hypothesis is based on one's personal opinion.
A good hypothesis can be tested.
A good hypothesis leads to a test with measureable results.
A good hypothesis does not always have to be based on prior knowledge or research.
A good hypothesis provides a possible explanation to answer a scientific question.
Answers
Answer:
- A good hypothesis can be tested.
- A good hypothesis provides a possible explanation to answer a scientific question.
- A good hypothesis does not always have to be based on prior knowledge or research.
Explanation:
The reason being because hypothesis are questions asked before the experiment. They usually involve the testable question and the experiment answers it, but not always. A good hypothesis doesn't need to have accurate results.
Answer:B : A good hypothesis can be tested. C:A good hypothesis leads to a test with measurable results. E: A good hypothesis provides a possible explanation to an answer a scientific question ( B, C, E)
Explanation:Just took the (Assignment) quiz
are standard electrode potential and standard hydrogen potential same?
Answers
Answer:
Potentials of any other electrodes are compared with that of the standard hydrogen electrode at the same temperature. Hydrogen electrode is based on the redox half cell: 2 H+(aq) + 2 e− → H2(g)..
What is the colour formed when N2O is bubbled into a solution of acidified FeSO4
Answers
5. What distinguishes the noble gases from other elements in the main group?
How does this contribute to the tendency for the various elements to react
with each other?
Answers
Answer:
Noble gases are the least reactive of all known elements. Their outer energy levels are full because they each have eight valence electrons. ... As a result, noble gases cannot become more stable by reacting with other elements and gaining or losing valence electrons.
Explanation:
Noble gases have complete valence shells so they do not participate in the reactions while the other elements in the main group have incomplete valence shells so they participate in the reaction to complete it.
What are noble gases?Noble gases can be described as the six elements that belong to the 18th group of the modern periodic table. The elements of group 18 are Helium, Neon, Argon, Krypton, Xenon, and Radon.
Under normal temperature and pressure conditions, all noble gases exist in the gaseous state and exhibit low chemical reactivity hence they are also referred to as inert gas. All noble gases possess stable electronic configurations because their valence shell is fully filled.
Noble gases are generally found as mono-atomic gases. The general electronic configuration group 18 elements can be written as ‘ns²np⁶’ where n is the principal quantum number.
Therefore, the reactivity of the noble gases can be distinguished from other elements in the main group.
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Explain why human being is regarded as a complex machine.
Answers
Answer:
Well a human bein is a complex organism with pain and emotion.
There is a very very complex brain that recives and sends sis also faster than the eye can see.
Thats why when you touch a hot surface a lighting fast signal is sent from the hand to the brain and the brain sends a signal back to the hand to tell it what to do and this all happens a faster than a second.
A human is made out of millions, billions, trillions, and quadrillions if cells working together to perform special tasks like eating, walking, and talking.
Answer:
Humans are the only known species that are able to think as complexly as we do. For example, animals are not able to have thoughts about their thoughts. Animals are not able to ponder the existence of our universe, develop calculus, chemical solutions, etc. There are many other intelligent species- like chimpanzees and octopi. However, both of those species are limited in the type of communication, emotion, and complex thinking skills that they possess compared to human beings.
Explanation:
A solution of HCL has percent by mass of 5%. What does it mean?
Answers
This means that in 100g of solution, there are 5g of HCl and 95g of water
Convert 100 miles to inches (there are 5280 ft in one mile)
using the method of dime signal analysis
Answers
Answer:
Explanation:
100 miles * [ 5280 feet / 1 mile] * 12 inches / 1 foot]
100 * 5280 * 12 inches
6336000 inches in 100 miles
Which statement best describes a compound formed by an ionic bond?
A) negatively charged
B) neutral
C) contains multiple charges
D) positively charged
Answers
Answer is D
Explanation:
Answer:
B. Neutral
Explanation:
When there is a ionic bond, one element steals or takes away an electron from the other element.
An example is NaCl
In this compound, Chlorine atom steals an extra electron from Sodium to fill its outer shell. So, this is a Ionic bond. Since, the Sodium compound gives away an atom, it is positively charged. Since, Chlorine steals an atom, it is negatively charged. Opposite charges attract, so they become a compound.
When positive and negative mix, it becomes neutral.
How does the percentage of monounsaturated and polyunsaturated fatty acids in olive oil compare to that of canola oil? Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. ResetHelp Olive oil has about Olive oil has about blank monounsaturated fats, while canola oil has about blank. monounsaturated fats, while canola oil has about Olive oil has about blank monounsaturated fats, while canola oil has about blank.. Olive oil has about Olive oil has about blank polyunsaturated fats, while canola oil has about blank. polyunsaturated fats, while canola oil has about Olive oil has about blank polyunsaturated fats, while canola oil has about blank..
Answers
This question is incomplete, here´s the complete question.
How does the percentage of monounsaturated and polyunsaturated fatty acids in olive oil compare to that of canola oil? Match the words in the left column to the appropriate blanks in the sentences on the right.
Olive oil has about ____ monounsaturated fats, while canola oil has about ___.
Olive oil has about ___ polyunsaturated fats, while canola oil has about ___.
6%
10%
30%
84%
5%
65%
Answer:
Olive oil has about 84% monounsaturated fats, while canola oil has about 65%.
Olive oil has about 5% polyunsaturated fats, while canola oil has about 30%.
Explanation:
Olive and canola oil are the major sources of monounsaturated fatty acids. Although vegetable oils usually have high concentrations of polyunsaturated fatty acids and less monounsaturated fats, olive and canola oils have comparatively less polyunsaturated fatty acids, and more monounsaturated fatty acids.
Predict with a reason, what would happen to a packet of potato chips that is packed with air when it is taken to o high mountain.
Answers
Explanation:
If you bring an unopened bag of potato chips aboard an airplane you'll notice that the bag puffs up as the plane ascends to a higher altitude explain why this happens using the information and terminology you learned in this module
please someone explain this I dont get it at all. how do we know that the 4th electron came from 2p because it's at 4th ionisation? why is it talking about 3s?? how do overall know that aluminium is in group 3 from the table??? thanks
Answers
Question 9 of 10
How could an electron configuration be used to predict relative atomic size?
A. The more valence electrons listed, the larger the atomic radius.
B. The larger the highest energy level number, the larger the atomic
radius.
C. The more sublevels occupied, the larger the atomic radius.
D. The greater number of total electrons, the larger the atomic radius.
SUBMIT
Answers
Answer: B
Explanation: Apex
An electron configuration be used to predict relative atomic size because the larger the highest energy level number, the larger the atomic
radius.
The electron configuration of an element shows the arrangement of electrons in atoms of that element.
As more sublevels are added, repulsion between electrons occupying shells increases causing a greater shielding and consequent increase in the size of the atom.
Hence, the larger the highest energy level number, the larger the atomic
radius.
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MgCl2(at)+Br2(l)=MgBr2(at)+Cl2(g)
how do you write in a word equation
Answers
aqueous Magnesium Chloride reacts with liquid Bromide to form aqueous Magnesium Bromide and Chlorine gas
What is an atomic mass unti
Answers
Explanation:
a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.
Answer:
Atomic Mass Unit is also called Dalton. It is used to express atomic and molecular weight. It is defined as 1/12 of the mass of an unbound neutral atom of carbon.
An atom X has a proton number of 19 and relative atomic mass of 39.
(i) How many electrons, protons and neutrons are there in an atom of X?
(ii) How many electrons will there be in the outer energy level (shell) of an atom of X?
(iii) What is the electronic configuration of X?
Answers
Answer:
1) electron=19 Proton=19 Neutron=39-19=20
2) 1
3) in pic
Answer:
(i)electrons = 19; Protons = 19 Neutrons =39-19=20
(ii) 1
(iii) 2,8,8,1
Hope this helps.
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How can biodiesel be a solution to the problems of climate change?
Answers
Answer:
BIOHEAT is a biodiesel mix that can be utilized (without equipment changes) in most home heaters. BIOHEAT promptly diminishes various hurtful discharges from heater use (up to 80% contingent upon blend used) and the oil is made from nearby feedstocks like utilized cooking oil
Which of the following chemical equations depicts a balanced chemical
equation?
O A. AgNO3 + K2 CrO4- > KNO3 + Ag2Cr04
B. 3AgNO3 + 2K2 CrO4- > 3KNO3 + 2Ag2 CrO4
OC. 2AgNO3 + K2 CrO4- > 2KNO3 + Ag2Cr04
OD. AgNO3 + K2 CrO4- > 2KNO3 + Ag2Cr04
Reset Selection
Answers
Answer:
C.
Explanation:
I believe C is the correct answer.
what is an example of mechanical energy converting to heat energy?
Answers
Answer:
Rubbing your hands together converts mechanical energy to thermal energy. Turning on a light switch converts mechanical energy to electrical and radiant energy.
Patience, a popular card game in Mendeleev's time, is also known as Go Fish.
A. True
B. False
Answers
Answer:
B. False
Explanation:
step by step explanation
Answer:
False
Explanation:
what are the 2 main methods of combination of elements??
Answers
Answer:
to make them react to each other to form a compound
Explanation:
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Answer:
An element is a material that consists of a single type of atom. Each atom type contains the same number of protons. Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.
2. Calculate the density of a metal that occupies 17.75 cm and has a mass of 342.93 g. [D = m/V]
Answers
Answer:
19.32
Explanation:
the density is given by the mass over volume
the mass In this case is 342.93 and the volume is 17.75
d=342.93g/17.75cm
=19.32g/cm
i hope this helps
why solids do not undergo diffusion
Answers
Answer:
Solids do not undergo diffusion because it has a fixed structure (vibrates in a fixed position) and it also cannot be compressed.
Hoped this helped in any way
Have a nice day
how is area and volume of cuboids calculated?
Answers
Answer:
A = Base x Height, Volume = Length x Width x Height
How many moles are present in 136 grams of MgCl2? 1.46 mol 1.43 mol 2.27 mol
Answers
Answer:
1.43 mol
Explanation: