the electron configuration for sodium is 1s22s22p63s1. which subshell is said to contain the valence electron(s) for sodium?
The subshell that contains the valence electron for sodium is the s subshell
Valence electronsValence electrons are the electrons located at the outermost shell of an atom
From the question, we are to determine the subshell that contains the valence electron(s) for sodium
The given electronic configuration for sodium is
1s²2s²2p⁶3s¹
The valence electron is the electron in the 3s orbital.
Hence, the subshell that contains the valence electron for sodium is s subshell
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A cup of hot water loses 265 cal
of energy to its surroundings.
How many joules of energy is
this?
[?] joules
Answer:
-1071 Joules
Explanation:
The Joule was introduced as the SI unit for energy in 1925. One calorie is equal to approximately 4.184 joules(J). This is a conversion factor that we can write two ways:
(1cal/4.184J) or (4.184J/1cal)
(265 cal)*(4.184J/1cal) = 1071 J
Since the energy is leaving the system, it should be written with a minus sign: -1071J
Answer:
1,108.76 joules
Explanation:
There are 4.184 joules per calorie
4.184 x 265 = 1,108.76
what is the empirical formula for a compound if a sample contains 1.0 g of S and 1.5 g of O?
1.SO
2.SO3
3.S202
4. S203
Calculate the mass of slver n grams depostedwhen 10.920 coulombs of electrcty s passed through a soluton of slver salt. (Ag= 180, 1 faraday-96500C)
the hemiacetal below is treated with 18o-labeled methanol (ch3o*h) and acid. where will the label appear in the products?
The 18o-labeled methanol (CH3O*H) will appear in the products side at position b.
Position of 18o-labeled methanol in the products
The 18O label will appear at position b in the product as indicated in the image.
This methoxy group in the product formed in position b comes from the 18O-labeled methanol (CH3OH).
While the oxygens at positions a and c in the product come from the unlabeled hemiacetal.
Thus, the 18o-labeled methanol (CH3O*H) will appear in the products side at position b.
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PLS HELP
4. T or F X-rays, ultraviolet light, and gamma rays all can travel through interplanetary space, so they are examples of waves.
5. What happens to the amplitude of water waves as you get farther from the disturbance that caused them? Why?
4. True
5. The amplitude of the ripples decreases as the circumference of the circle increases.
What is a wave?A wave is a disturbance that moves energy from one place to another.
Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation. Electromagnetic radiation can be described in terms of a stream of mass-less particles, called photons, each travelling in a wave-like pattern at the speed of light. Hence, the statement is true.
As the disturbance moves outwards the energy it carries is spread over a larger and larger region called the wavefront. For example, the ripples in the water lie in a circle with an ever-increasing circumference. The amplitude of the ripples decreases as the circumference of the circle increases.
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PLEASE HURRY!! WORTH 50 POINTS!
A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively. What is the partial pressure of the third gas, helium?
0.22 atm
0.33 atm
1.03 atm
2.28 atm
Answer:
P total = 1.25 atm
neon = 0.68 atm
argon= 0.35 atm
helium= x
1.25=0.68+0.35+x
1.25-0.68-0.35=x
x=0.22 atm
How many moles of hydrogen
gas will be produced at the same
time as 138 g NaOH?
2Na+ 2H₂O → 2NaOH + H₂
Answer:
1.72 moles of H₂
Explanation:
The balanced equation
2Na+ 2H₂O → 2NaOH + 1C
tells us we'll get 1 mole of H₂ for every 2 moles of NaOH. We can express this as a molar ratio: (1 mole H₂)/(2 moles NaOH).
The reaction produces 138 g of NaOH. Divide this mass by the molar mass of NaOH (39.99 g/mole)to obtain moles NaOH:
138g NaOH/(40 g/mole) = 3.45 moles of NaOH.
To find the moles H₂ produced, we can multiply the moles NaOH by the molar ratio from above:
(3.45 moles NaOH)*((1 mole H₂)/(2 moles NaOH) = (3.45/2) moles H₂. [Note how the "moles NaOH" unit cancels, leaving just "moles H₂"]
We should produce 1.72 moles of H₂.
What are the conditions needed for reaction to happen in aldehydes and ketones?
Please help thank you
Explanation:
You may not realise it, but you come across aldehydes and ketones many times a day. Take cakes and biscuits, for example. Their golden, caramelised crust is formed thanks to the Mailliard reaction. This is a process that occurs at temperatures above 140° C, when sugars with the carbonyl group in foods react with nucleophilic amino acids to create new and complex flavours and aromas.
Another example is formaldehyde. Correctly known as methanal, it is the most common aldehyde in industry. It has multiple uses, such as in tanning and embalming, or as a fungicide. However, we can also react it with different molecules to make a variety of more useful compounds. These include polymers, adhesives and precursors to explosives. But how do aldehydes and ketones react, and why?You should remember from Aldehydes and Ketones that they both contain the carbonyl functional group , . This is a carbon atom joined to an oxygen atom by a double bond. Let's take a closer look at it.
If we compare the electronegativities of carbon and oxygen, we can see that oxygen is a lot more electronegative than carbon.
The difference in an area with high concentration and an area with low concentration is called.
The difference in an area with high concentration and an area with low concentration is called the concentration gradient.
What is Concentration Gradient ?
A concentration gradient occurs when the concentration of particles is higher in one area than another.
In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.
This difference in an area with high concentration and an area with low concentration is called the concentration gradient.
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Willing to give Anyone 17+ points to anyone who can help with this. Barium can form ions with a +2 charge. Is it a cation or an anion?
Barium can form ions with a +2 charge and it is called a cation.
Ex:- Ba(s)+2HCl(aq)→BaCl2(aq)+H2(g)
In this redox reaction,
initially, barium shows 0 (s) oxidation no. and after forming the product its oxidation no. changes to +2 (in aq).
When a metal loses electrons and a nonmetal gets those electrons, cations (positively charged ions) and anions (negatively charged ions) are created.
Ionic bonds are created when a metal and a nonmetal interact. The position of an element on the periodic table can frequently tell you what charge an ion generally carries:the alkali metals (the IA elements) lose a single electron and form a 1+ charge. the alkaline earth metals (IIA elements) lose two electrons and form a 2+ cation.IIIA family member aluminum loses three electrons to become a 3+ cation.Seven valence electrons are shared by all of the halogens (VIIA elements) and each of them has a single negative charge, forming an anion.The VIA elements pick up two electrons to create 2- charged anions.The VA elements pick up three extra electrons to create 3- charged anions.To know more about elements of the periodic table refer to:-
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Identify different hydro-meteorological hazards;
Hydrometeorological hazards are caused by extreme meteorological and climate events, similar as cataracts, famines, hurricanes, tornadoes, or landslides.
Hydrometeorology it’s a branch of meteorology and hydrology that studies the transfer of water and energy between the land face and the lower atmosphere.They regard for a dominant bit of natural hazards and do in all regions of the world, although the frequency and intensity of certain hazards and society’s vulnerability to them differ between regions. Severe storms, strong winds, cataracts, and famines develop at different spatial and temporal scales, but all can come disasters that beget significant structure damage and claim hundreds of thousands of lives annually worldwide. hourly, multiple hazards can do contemporaneously or spark slinging impacts from one extreme rainfall event.In addition to causing injuries, deaths, and material damage, a tropical storm can also affect in flooding and mudslides, which can disrupt water sanctification and sewage disposal systems, beget overflow of poisonous wastes, and increase propagation of mosquito- borne conditionsTherefore these are the hydro-meteorological hazards.
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3. Which nuclear radiation is similar to high energy X-rays?
beta
alpha
gamma
neutron
Answer: Gamma radiation
Explanation:
Gamma rays have high penetrating power, similar to high-energy X-rays.
Question 3 of 25
Which statement describes a question that can guide the design of a
scientific investigation?
OA. It asks about whether a controlled variable is necessary.
B. It asks about the preferred outcome of the investigation.
C. It asks about how the observations will be organized.
D. It asks about a cause-and-effect relationship between two
variables.
The statement that describes a question that can guide the design of a scientific investigation could be about the necessity of a controlled variable. The correct answer is A.
What is a controlled variable?It is a variable whose values are controlled by the researcher during the course of experimental investigations.
When designing an experiment, it is necessary to identify the different variables that would be involved for a successful investigation.
Variables can be independent, dependent, controlled, or constant. Identifying the necessary variables will help in designing the experiment.
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In a titration, 25.0 mL of a 0.40 M NaOH solution is used to neutralize 10.0 mL of HCl. Calculate the molarity of the acid.
The molarity of the HCl acid will be 0.001 M.
What is Neutralization ?A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H⁺ ions and OH⁻ ions to generate water.
This is the neutralization of a strong acid (HCl) and a strong base (NaOH), which is ruled by this equation :
HCl (aq) + NaOH (aq) → NaCl (aq) + H₂O (l)
Mole Ratio : 1 mol HCl : 1 mol NaOH
Formula used ;
Molarity = number of moles / Volume (in liters)
Solve for n ;
n = M × V
Substitute values and compute ;
n = 0.40 M × 0.025 liter = 0.01 moles NaOH.
As the molar ratio is NaOH : HCl
Therefore, there will be same number mole for the HCl
Now, Molarity of HCl Solution ;
Molarity = n / volume
Molarity = 0.01 / 10
= 0.001 M HCl
Hence, The molarity of the HCl acid will be 0.001 M.
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For the reaction C+ 2H2 → CH4, how many grams of hydrogen are required to produce 5 moles of
methane, CH4 ?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer
as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your
answer incorrect.:
Element
Hydrogen
Carbon
Molar Mass
1
12
10 mol of H₂ required to produce 5 moles of methane (CH₄)
What is Mole ratio ?Mole Ratio is a conversion factor between compounds in a chemical reaction, that is derived from the coefficients of the compounds in a balanced equation.
The mole ratio is therefore used to convert between quantities of compounds in a chemical reaction.
Given reaction ;
C + 2H₂ -------> CH₄
from reaction 2 mol 1 mol
from the question x mol 5 mol (given)
Now,
x = 2 x 15 / 1 = 10 mol
= 10 mol of H₂.
Hence, 10 mol of H₂ required to produce 5 moles of methane (CH₄)
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How does gravity depend on the mass of two objects
Gravity increases as the mass of either object increases.
What is gravity?Gravity is the force by which a planet or other body draws objects toward its centre. The force of gravity keeps all of the planets in orbit around the sun.
Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.
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1. What were the concentrations of samples A and B?
2. What are some possible sources of error in a titration experiment? Share some tips to minimize errors with your classmates.
3. What is an example of a problem that can be solved using titration in the real world?
4. Phenolphthalein was used as the indicator in the experiment. The universal indicator exhibits the rainbow of colors for the entire pH range. Do you think using the universal indicateor would also work for this lab? Justify your answer, and explain why you agree or disagree.
A food processing company might use titration to calculate the precise amount of salt in a particular food stuff.
What is Titration ?A process of determining the concentration of a dissolved substance in terms of the smallest amount of reagent of known concentration required to bring about a given effect in reaction with a known volume of the test solution
The general source of error in titration has been;
The measurement of volume in burette by at the lower meniscus. It has been corrected with the application of measurement at eye level.The air bubble in the burette results in the incorrect measurement of the volume of burette. It can be corrected by tapping the burette or by slowing adding the solution to remove the bubble.The absence of rinsing the burette before use has been resulted in the water droplets that has been results in the incorrect measurement and dilution of the solution. The correction has been made by the use of dried burette.A food processing company might use titration to calculate the precise amount of salt in a particular food stuff.
It can also be used to determine the concentration of vitamin C or vitamin E additives in foods.
Universal indicator can also work as the indicator in the lab.
When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution.
Acids cause universal indicator solution to change from green toward red whereas, bases cause universal indicator to change from green toward purple.
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How many moles is 25g of ammonia (NH3)?
Explanation:
Ammonia has a formula mass of 17.031 g/mol, so the top blank is 1 and the bottom blank is 17.031
Calculating the product, we get the answer to be 1.5 mol
How much percent of shops are in the city? How about in the country?
HELP PLS WILL GIVE BRAINLY FAST
Answer:
I would say there would be 5-10% in a city, and maybe 10-20% in the country. It mainly varies depending on how big the city is, how many people/districts there are, and the size of the country, which makes it hard to give a certain percent of shops, as there may be small businesses included as well or new shops being built.
Hope this helps! This was pretty confusing for me as well so i hope the answer is alright (×﹏×)
pls help.
Dr. AT is studying the effect playing music has on plant growth. To do this she sets up three greenhouses each growing pea plants. One of the greenhouses plays classical music to the plants all day, the second greenhouse plays pop music, while the third is silent. All other factors, such as water and sunlight are identical between the three greenhouses. After two weeks, Dr. AT measures each pea plant and records her data. What greenhouse is the control group in this experiment?
A. The silent greenhouse.
B. The pop music greenhouse.
C. The classical music greenhouse.
D. The height of the plants.
Answer:
c or d
Explanation:
it says it was playing classic music
In this case, the control group or control variable is the greenhouse where the plants are grown in silence, as this group does not receive any music treatment. Therefore, the correct answer is A.
Variables can be defined as any characteristics, number or a quantity that can be measured . It is also called as a data item . It is called as variable because it can vary and can also have wide variety of values.
There are 3 types of variables 1) manipulated variable where the condition is specified, 2) responding variable which is dependent on the manipulated variable 3)controlled variable which does not change.
In this experiment, the control group is the group that does not receive the experimental treatment and serves as a basis for comparison.
Thus, the correct answer is A , the silent greenhouse.
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Is the relationship between temperature and water density an inverse or direct relationship?
The relationship between temperature and water density is an inverse relationship.
Temperature:-A measure of the typical kinetic energy of the atoms or molecules in a system, the temperature is a physical variable that expresses hot and cold.
Density:-The definition of density is the mass of a substance per unit volume. Density is defined as the ratio of mass to volume, or mass per unit volume.
Relation between temperature and density:-An inverse relationship exists between temperature and density. The density of water drops because of the increased distance between water molecules as temperature rises. Water's density rises when its temperature drops, but only to a certain extent.
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The absorption spectrum of sodium is shown below. What do the two dark
vertical lines in the spectrum show about sodium atoms?
Absorption spectrum
700
600
500
400 nm
OA. A sodium atom gives off all wavelengths except those two when
an electron moves to lower energy levels.
OB. A sodium atom gives off those two wavelengths when an electron
moves to a higher energy level.
OC. Only those two wavelengths can cause an electron to move to a
higher energy level.
OD. All wavelengths except those two cause an electron to move to a
lower energy level.
SUBMIT
The two dark vertical lines in the spectrum shows that all wavelengths except those two cause an electron to move to a lower energy level. Hence, Option (D) is correct
What is Absorption Spectrum ?
A spectrum of electromagnetic radiation transmitted through a substance, showing dark lines or bands due to absorption at specific wavelengths.
The given fact is explained by the energy levels that electrons may be in are quantized, or vary by a specific amount.
When electrons go from one energy level to another, the difference in those energy level is a specific value, and not a range of values.
If they are transitioning upwards towards a higher energy, they will absorb the photons corresponding to the wavelength of light which has the specific amount of energy they need to ascend, resulting in dark lines.
Similarly, when the electrons transition from higher to lower energy, the same specific amount of energy is released and the emission spectrum shows lines in the places where the absorption spectrum was dark.
Hence, The two dark vertical lines in the spectrum shows that all wavelengths except those two cause an electron to move to a lower energy level. Therefore, Option (D) is correct
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How many moles of NO2 form when
63.25 g N2O5 decompose?
2N₂O54NO₂ + O₂
Answer:
1.1713 moles
Explanation:
RFM of N2O5=108
Moles of N2O5= mass/RFM= 63.25/108=0.5856 moles
Mole ratio of N2O5:NO2= 2:4
Therefore moles of NO2= 4/2*0.5856= 1.1713 moles
Write the formula and calculate the molecular mass of
1) Soda ash
2) Baking Soda
3) Lime Stone
4) Ethanol
5) Common Salt
The molecular formula is the sum of the atomic masses of all atoms in the molecule.
The formula of Soda Ash:
Na₂CO₃ is also known as Sodium Carbonate.
The molecular mass of Soda Ash is
(2×Na)+(1×C)+(3×O)=106g/mol
The formula of Baking Soda:
NaHCO₃ is also known as Sodium bicarbonate.
The molecular mass of Baking Soda is
(1×Na)+(1×H)+(1×C)+(3×O)=84g/mol
The formula of Lime Stone:
CaCO₃ is also known as Calcium carbonate.
The molecular mass of Lime Stone:
(1×Ca)+(1×H)+(1×C)+(3×O)=100g/mol
The formula of Ethanol:
C₂H₅OH is the formula of ethanol.
The molecular mass of Ethanol:
(2×C)+(6×H)+(1×O)=46g/mol
The formula of Common Salt:
NaCl is also known as Sodium chloride.
The molecular mass of Common Salt:
(1×Na)+(1×Cl)=58.5g/mol
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What is the correct formula that would result from the combination of the two ionic species?
Cs¹+ and Cl¹-
Answer:
CsCl
Explanation:
The ionic species are:
Cs⁺ and Cl⁻
PLEASE HELPNIM STUCK
Answer:
I think its C
Explanation: cuz the pictures indicate that is returns to "normal" last.
S + 6 HNO3 → H₂SO4 + 6 NO₂ + 2 H₂O
-
In the above equation, how many grams of water can be made when 5.8 moles of HNO3 are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer
as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your
answer incorrect.:
Element
Molar
Mass
Hydrogen 1
Nitrogen 14
Sulfur
32
Oxygen 16
35 g (Rounded to the nearest tenth) H₂O can be made when 5.8 moles of HNO₃ are consumed.
What is Mole ratio ?Mole Ratio is a conversion factor between compounds in a chemical reaction, that is derived from the coefficients of the compounds in a balanced equation.
The mole ratio is therefore used to convert between quantities of compounds in a chemical reaction.
The mole ratio of HNO₃ and H₂O is 6 : 2
Hence, 16.9 moles of HNO₃ will produce = 2/6 × 5.8 = 1.93 moles of H₂O
Also,
Mass = Moles × M.Mass
Mass = 1.93 mol × 18.02 g/mol
Mass = 34.83 g H₂O
= 35 g (Rounded to the nearest tenth)
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If you keep a gas's temperature constant, how would you increase the volume of the gas?
a. You would change the temperature
b. You would increase the pressure
c. You would decrease the temperature
d. You would decrease the pressure
Answer: d. You would decrease the pressure
Explanation:
If the temperature of a gas is held constant, the pressure and volume vary inversely.
If the gas's temperature remains constant, then increase the volume of the gas with a decrease in the pressure. Therefore, option (D) is correct.
What is Boyle's law?Boyle’s law can be described as at a constant temperature, the pressure exerted by a given mass of gas being inversely proportional to the volume occupied by the gas.
The pressure and volume of a gas at a particular temperature have an inverse relationship.
P ∝ 1/V
or P₁ .V₁ = P₂. V₂ ................ (1)
Where the initial and final pressure of the gas is P₁ and P₂ respectively. The initial and final volume of the gas is V₁ and V₂ respectively at temperature 'T'.
Therefore, if we keep the temperature of the gas constant. them the volume of the gas will increase only if we decrease the pressure of the gas.
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What’s the name of this compound?
Answer:
decane
Explanation:
decane has 10 carbon and 22hydrogen
