The answer is moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.
What is Atomic Number ?The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus.
Atomic Number (generally ) = Number of Protons
The atomic number can be used to uniquely identify ordinary chemical elements.
In an ordinary uncharged atom, the atomic number is also equal to the number of electrons.
The atomic number increases moving left to right across a period and subsequently so does the effective nuclear charge.
Therefore, moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.
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Compare the boiling points of alcohol, ethers and alkanes and explain one reason for the difference
Alcohols have higher boiling points than do ethers and alkanes of similar molar masses.
What is meant by Boiling Point ?The temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid is called the boiling point of the substance.
Approximately boiling point of Ethanol: 78.4°C, ether: 34.6°C, ethanes: 68°C
The reason for the difference is that it takes more energy to separate alcohol molecules then it does to separate alkane molecules and ether molecules.
The OH group in alcohol allows molecules to engage in hydrogen bonding.
Therefore Boiling point are in the order ;
Alcohol > alkane > ethers
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A gas occupies 500.0 mL at 30.00°C and 70.00 kPa. What will the volume be at SC?
Given the initial volume, temperature and pressure of the gas, at Standard conditions for temperature and pressure, the new volume will be 310mL.
What is combined gas law?Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
P₁V₁/T₁ = P₂V₂/T₂
Given the data in the question;
Initial volume V₁ = 500mL = 0.5LInitial pressure P₁ = 0.690846atmInitial temperature T₁ = 30.00°C = 303.15KAt Standard conditions for temperature and pressure
Final pressure P₂ = 1.0atmFinal temperature T₂ = 273.15KFinal volume V₂ = ?To calculate the new volume the gas, we substitute our given values into the expression above.
P₁V₁/T₁ = P₂V₂/T₂
P₁V₁T₂ = P₂V₂T₁
V₂ = P₁V₁T₂ / P₂T₁
V₂ = ( 0.690846atm × 0.5L × 273.15K ) / ( 1.0atm × 303.15K )
V₂ = 94.3522925LatmK / 303.15atmK
V₂ = 0.31L
V₂ = 310mL
Given the initial volume, temperature and pressure of the gas, at Standard conditions for temperature and pressure, the new volume will be 310mL.
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A 3.00 laqueous solution of koh contains 195 g of koh. The solution has the density of 1.29 g/ml
For a 3.00 aqueous solution of Koh contains 195 g of Koh. The solution has a density of 1.29 g/ml and is mathematically given as
molarity = 1.16L
molarity of solution = 0.946M
percentage concentration = 5%
What is molarity?
Generally, the equation for molarity is mathematically given as
molarity = no of moles/ volume in liters
no of mol = 195/56.1
no of mol = 3.48
molarity = 3.48/3.00
molarity = 1.16L
therefore,
mass = 1.29 g/ml x 3000mL
mass = 3.87kg/mL
mass of solute is
= 3.87-0,195
= 3.675
molarity of solution
= 3.48/3.675
molarity of solution = 0.946M
In conclusion, the percentage concentration is
= 195/3870 x100
percentage concentratio = 5%
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What is the percent by mass of 110.6 g of potassium fluoride (NaF) dissolved in 1500.0 g of
water?
The percent by mass of 110.6 g of potassium fluoride (NaF) dissolved in 1500.0 g of water is 0.073733 %.
What is the mass percentage?The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution, as a whole.
[tex]\rm\;Mass \;percentage =\frac{\;Mass \;of \;solute}{\;Mass \;of \;solution}[/tex]
Calculate the mass percent of potassium fluoride, using the formula:
[tex]\rm\;Mass \;percentage =\frac{\;Potassium \;fluoride}{\;Mass \;of \;Water}[/tex]
[tex]\rm\;Mass \;percentage =\frac{110.6}{1500.0}[/tex]
Mass percentage = 0.073733 %
Hence, the percent by mass of 110.6 g of potassium fluoride (NaF) dissolved in 1500.0 g of water is 0.073733 %.
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I Need help!!!!!!!!!
Answer:
Green=2.81
Yellow=10^-5
Explanation:
It is the correct answer. the exponent power will become 10^-4 without any calculations
How much heat is required to raise the temperature of 1.5 x 103 g of water from 5 °C to 50 °C? The specific heat of water is 4.184 J/g °C.
Answer:
282420J
Explanation:
Q = mc∆T
= 1500 x 4.184 x (50 - 5)
= 282420J
If there are 9.02x103 amu of copper in a sample, how many copper atoms are there in
the sample?
Answer:
Average atomic mass = 63.62 amu
Explanation:
Average atomic mass is the weighted average of the individual isotopes.
And thus the weighted average =
(0.6917×63+0.3083×65)⋅amu = ?? amu.
Note that we have not accounted for the less massive copper isotopes that would decrease this mass to the accepted value of
63.55 amu.
Hope this helps! Good luck!
this homework assignemnt is confusing can someone please help.
Answer: Heyya, the answer is 0.8539gH2. Pls mark brainliest
Explanation:
Which of the following items is NOT a compound?
One of the particles in an atom is the proton. A proton has a radius of
approximately 1.0 x 10-13 cm and a mass of 1.7 x 10-24 g. Determine the density of
a proton. (Hint: Find the volume of the proton and then divide the mass by the
volume to get the density.)
4
(volume of a sphere = ³; π = 3.14)
Answer:
Density = 4.06 * 10^14
Explanation:
Givens
r = 1 * 10^-13 cm
m = 1.7 * 10^-24 grams
Formula
V = 4/3 * pi * r^3
D = m/V
Solution
Put the givens into the formula.
V = (4/3) 3.14 * (1 * 10^-13)^3 Find the value for r^3
V = (4/3) 3.14 * 1 * 10^-39 Find the volume. Indicate divide by 3
V = 1.256 10^-38/3
V = 4.1867 * 10^-39
Density = m / v
Density = 1.7*10^-24/4.1867*10^-39 Do the division
Density = .406 * 10^(-24 + 39)
Density = .406 * 10^15 grams/ cm^3
Answer: Density = 4.06 * 10^14
How many grams of oxygen can be prepared by the decomposition of 12 grams of mercury oxide?
Glycolysis is an example of:
A.
Aerobic metabolism
B.
Anabolic metabolism
C.
A net reductive process
D.
Fermentation
Answer:
glycolysis is an example of aerobic metabolism option A is the correct answer of given statement
Explain
Tell if each statement is true or false. Explain your choice.
4. Water can take only one path through the water cycle.
This statement is ______________ because _____________________________________
______________________________________________________________
5. What is the role of the sun in the water cycle?
(23 points)
There are so many routes by which water can move through the various stages in the water cycle.
What is the water cycle?The water cycle has to do with the route of movement of water in the enviroment. We have to note that there are so many routes by which water can move through the various stages in the water cycle.
The sun supplies the energy that drives the water cycle. This is seen in the fact that the supply of energy from the sun is required for evaporation to take place.
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A 104.5 mL intravenous (IV) solution contains 5.10 g of glucose (C6H12O6). What is the molarity of this solution? The molar mas of glucose is 180.16 g/mol.
Answer:
Molarity=0.271M
Explanation:
molarity=moles/volume
moles=5.10/180.16
=0.0283 moles
volume=0.1045L
Molarity=0.0283/0.1045
=0.271M
A gold bar is contain 3.0 mol of gold, how many atoms of gold are in the bar
Answer:
18.066 x 10^23 atoms of Au
Explanation:
ONE mole = 6.022 x 10^23 particles
3 x 6.022 x 10^23
There are 11 runners in a race. Medals are awarded for 1st, 2nd, and 3rd place. In how many different ways can the medals be awarded? 330 990 110 165
Answer:
990
Explanation:
A gas at a volume of 9 liters is at a pressure of 6 atm. The volume is changed to 12 Liters, what must the new pressure be?
Boyle's Law
P₁V₁=P₂V₂
6.9 = P₂.12
P₂ = 4.5 atm
When 0.28g of a basic oxide, MO, is reacted with 250cm3 of 0.05moldm–3 hydrochloric acid the excess acid required 50cm3 of 0.05moldm–3 sodium hydroxide solution for neutralisation. Which one of the following is the relative atomic mass of M?
A 12
B 28
C 40
D 56
the answer is C but i have no idea how!
mol of excess acid: 50 cm ³x 0.05 M = 2.5 mlmol
mol of acid reacted: (250 cm³ x 0.05 M) - 2.5 mlmol = 10 mlmol = 10 x 10⁻³ mol
MM (molar mass) MO = mass : mol = 0.28 : 10 x 10⁻³ = 28
MM MO = Ar M + Ar O
28 = Ar M + 16
Ar M = 12
I think the answer is A
3. A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressures of the three
gases in the tank are 35.0 atm of O2, 5.0 atm of N, and 25.0 atm of He, what is the total pressure
inside of the tank?
For the following H30 concentration list the pH and the OH concentration in
Molarity) (5 points each, 10 points total)
[H30*]= 1.4*105 M
pH=
[OH]=
Answer:
[H3O+] = 1.4*10^-5 M
pH = 4.85
[OH-] = 7.08*10^-10
Explanation:
As pH is a measure of hydronium H3O concentration, simply substitute [H3O+] into the following equation:
pH = -log[H+]
pH = -log(1.4*10^-5)
pH = 4.853871...
Round to 2-3 sig figs due to only being given data with 2 significant figures
pH = 4.85
One method to get to [OH-] is to turn pH into pOH and then use inverse functions to get [OH-]
pH + pOH = 14
4.85 + pOH = 14
pOH = 9.15
Then to get [OH-] from pOH:
pOH = -log[OH-]
9.15 = -log[OH-]
-9.15 = log[OH-]
10^(-9.15) = [OH-]
7.07945784 * 10^-10 = [OH]
Round based on given significant figures again:
7.08*10^-10 = [OH-]
(Feel free to add any questions & I'll be sure to reply if clarification is needed)
[H₃O]=1.4 x 10⁻⁵
pH = 5 - log 1.4
pOH = 9 + log 1.4
[OH⁻] = 1 x 10⁻¹⁴ : 1.4 x 10⁻⁵ = 7.14 x 10⁻¹⁰
What are the reactants in the reaction?
What are/is the product of the reaction?
Answer:
Reactants are on left side ( Hydrogen + oxygen).
products are on right side (Water)
Explanation:
Things that go into reaction are called reactants.
things that go out of reaction are called products.
Which picture shows a pattern of stars? (2 points)
Group of answer choices
the moon in the sky
Public Domain
two children watching a shooting star
© Choreograph / iStock 2018
the sun setting in Ottawa, Canada
a line connecting five stars together
Answer:
A line connecting five stars together
Explanation:
Constellations or patterns (same thing) are made up of stars. The stars form shapes, but there is not really lines in the sky. We have to draw the lines with our head or take a picture of it and draw lines on it. Some patterns are: the big dipper, the small dipper etc. Last but not least, just some random info about the constellations.. zodiac signs have their own constellations. Here is a list of the zodiacs to their constellations:
•Leo (the Lion)
•Aquarius (the Water Bearer)
•Gemini (Twins)
•Cancer (Crab)
•Aries (Ram)
•Scorpio (Scorpion)
•Taurus (Bull)
•Sagittarius (Archer)
•Capricorn (Sea Goat)
•Pisces (Fishes)
•Libra (Scales)
•Virgo (V-i-r-g-i-n: Maiden)
At 25°C and 1.0 atm, 0.84 g of a gas dissolves in 2.00 L of water. What mass of the gas dissolves
in 1.00 L of water at 25°C and 3.0 atm?
The mass of the gas dissolved in 1.00 L of water at 25°C and 3.0 atm is equal to 1.26 grams.
How to determine the mass of the gas dissolved?In order to determine the mass of the gas dissolved, we would the calculate the new (final) solubility of this gas by applying this formula:
S₁P₂ = S₂P₁
Making S₂ the subject of formula, we have:
S₂ = (S₁P₂)/P₁
S₂ = (0.42 × 3.0)/1.0
S₂ = 1.26 g/L.
Now, we can determine the mass:
Mass = solubility × volume
Mass = 1.26 × 1.00
Mass = 1.26 grams.
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What are the three main organic things found in healthy soil? (Select three.)
Answer:
Organic matter is composed of living things (plant roots and organisms), dead things (recent plant and animal residue), and very dead things (highly decomposed material, or humus).
Explanation:
hope this helps if not let me know have a great day
Which best describes the reactants and products of photosynthesis
Answer:
Depends on what the answers say.
Explanation:
But from what I know, the equation is:
6CO2 + 6H2O------> C6H12O6 + 6O2
And also that arrow there should mean in the presence of sunlight and chlorophyll.
Describe briefly a chemical test to identify a sample of each of the following gases in the laboratory. For each test include a short description of the procedure (method) and the expected observations. a) hydrogen gas b) oxygen gas c) carbon dioxide gas
According to the chart of specific heats, which material requires the most heat to raise its temperature from 10°C to 30°C?
Answer
A
Aluminum
B
Oil
C
Glass
D
Gold
The material which requires the most heat to raise its temperature from 10°C to 30°C is oil.
What is the formula to calculate absorbed heat?The formula which we used to calculate the amount of involved heat in relation with specific heat is:
Q = mcΔT, where
Q = absorbed heatm = massc = specific heatΔT = change in temperatureAmong the given materials, specific heat of oil is highest than other materials so will require maximum absorbed heat.
Hence, oil requires the most heat.
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CHEMISTRY
A certain reaction is endothermic in the forward direction. The reaction has less moles of gas on the product side. Which of the following stresses would increase the yield of the products (shift right)?
•Decreasing the temperature
•Decreasing the reactant concentration
•Increasing the volume
•Increasing the pressure
answer is either A or D if that helps
Answer:
A
Explanation:
The forward reaction would be favoured as the increase in temperature would cause more heat for the reaction to absorb so the endothermic reaction would be increased.
The table compares the frequency of some unknown electromagnetic waves,
Comparison of Frequency
Electromagnetic Wave Frequency (hertz)
1014 Hz
1010 Hz
1020 Hz
106 Hz
Which electromagnetic wave has the
longest wavelength?
Wave W
Wave X
Wave Y
Wave Z
Answer:
Wave X
Explanation:
because the lower the frequency, the longer the wave length
Answer:
Wave X is the correct answer. Hope it helps!
Explanation:
How do ice and water on the ground affect incoming solar radiation? O They filter 22 percent of solar radiation that reaches the surface. They reflect 4 percent of solar radiation that reaches the surface. They absorb 100 percent of solar radiation that reaches the surface. O They scatter 5 percent of solar radiation that reaches the surface.
Answer:
They reflect 4 percent of solar radiation that reaches the surface.
Explanation:
When the sun angle is high and water is liquid notice, there is less reflection that takes place.