Answer:
3p^2
Explanation:
after filling 3s^2 only two electrons left out of 14 so the next sub shell is 3p therefore ,X represents 3p^2
How many protons,neutrons, and electrons does uranium 238 have
Explanation:
92 protons 92 electrons and 146 neutrons
Answer:
92 protons, 92 electrons, 146 neutrons
Explanation:
U-238 has 92 protons, 92 electrons, 146 neutrons.
The 238 is mass number talking about protons + neutrons. Uranium will always have 92 protons so the rest of the things are neutrons (146). Electrons will always equal protons if the element is neutral (no charge) and since no charge was given the numbers will match
Which of the following is not one of the four things that all organisms need to survive?
A. water
B. air
C. a source of energy
D. the ability to move
Answer:
b
Explanation:
this is because all organisims need water, c is out of the question because no energy is needed, d is out because it is needed for fighting against predators
differentiate between ideal and non - ideal solutions.
[tex] \\ [/tex]
ty! ~
Answer:
Ideal Solution: An ideal solution is a solution where interactions between molecules are identical between all the molecules in the solution. Non ideal Solution: A non ideal solution is a solution that has differences in the interactions between molecules of different components in the solution.
Explanation:
Answer:
Ideal solutions obey Raoult's law over entire range of concentrations. Nonideal solutions do not obey Raoult's law over the entire range of concentrations. 2. The vapour pressure of ideal solution always lies between vapour pressures of pure components.
Complete the sentence using ide, ate or Ic. To determine the name of an anion, you take the name of its element and replace the end with
To determine the name of an anion, you take the name of its element and replace the end with "ide".
What is an anion?An anion in chemistry is a negatively charged ion.
Anions are usually formed when a non-metallic atom gains electron(s).
An anion is usually named by taking the elemental name, removing the ending, and adding “ide.
Examples of anions are as follows:
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Question 12
How many moles of aluminum phosphate are produced when 6.8 moles of aluminum nitrate
reacts?
A dodecahedron must have 12 faces
Of these 12 faces, two must be the top & base.
So there shall be 10 faces on the lateral surface.
Hence there shall be 5 on one half & 5 on the other half.
To have 5 faces on the base of a regular polygon, the base must have 5 sides.
So it must be a regular pentagon.
The faces of a regular dodecahedron are regular pentagons.
Option C) is the right answer.
An image is attached for your reference.
Explanation:
What is the grams per liter concentration of a solution
composed of 8.210 g of potassium chloride, KCI,
dissolved in enough water to make 0.300 L of solution?
a. 0.0846 g/L
b. 16.4 g/L
c. 0.367 g/L
d. 27.4 g/L
Grams per liter in the solution give the density of the solution. The density of the solution is 27.4 g/L. Thus, option d is correct.
What is density?Density is the ratio of the mass in gms to the volume of the solution in liters.
Given,
Mass of potassium chloride = 8.210 gms
Volume of solution = 0.300 L
Density is calculated as:
ρ = mass ÷ volume
= 8.210 ÷ 0.300
= 27.36 g/L
Therefore, the density of the solution is 27.4 g/L.
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) Calculating Heat from Thermochemical Equations
The thermochemical equation for the combustion of methane gas is:
Calculate much heat is released when 3.5 moles of methane gas undergo a combustion reaction.
A combustion reaction is a reaction that reacts in the presence of oxygen molecules. Methane will release -3115 kJ/mol of heat.
What is a combustion reaction?A combustion reaction includes the reaction between the chemical reactant and oxygen molecule to produce the product. The combustion reaction between methane and oxygen is given as:
CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol
The stoichiometry coefficient from the reaction gives 1 mole of methane releases -890 kJ/mol enthalpy.
So, 3.5 moles methane will release = 3.5 × -890 = -3115 kJ/mol
Therefore, -3115 kJ/mol of heat is released.
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A 700 mL sample of nitrogen is heated from 37 °C to 77 °C at constant pressure. What is the final volume? a. 790 L b. 790 ml c. 970 ml d. 970 L
The final volume of the nitrogen sample would be 790 mL
Charle's LawAccording to Charles, at constant pressure, the volume of a gas is directly proportional to its temperature.
Mathematically: v1/t1 = v2/t2, where v1 and v2 = initial and final volume, and t1 and t2 = initial and final temperature.
In this case, t1 = 37 °C or 310 K, t2 = 77 °C or 350 K, v1 = 700 mL
Thus: v2 = v1 x t2/t1 = 700 x 350/310 = 790 mL
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What causes ocean water near the equator to be warmer than ocean water
farther north?
O A. The sun's rays strike the water more directly near the equator.
B. Because of Earth's rotation, gyres near the equator flow clockwise.
C. Deep-sea vents pump steam into the ocean's conveyor belt near
the equator.
D. The water is denser and saltier near the equator, so it holds more
heat.
Answer:
A. The sun's rays strike the water more directly near the equator.
Explanation:
I pass the test
& Sodium chloride, sugar, starch, and sand are added to water separately in different beakers and the mixtures are stirred well. A suspension will be formed in which case? Give any two reasons for your choice.
Answer:
sugar I like it I think iyrx
Edge Modeling Nuclear Changes
Summarize nuclear changes.
a) Use your completed table and models to write a summary that addresses the following questions:
1. How does energy change in these reactions? Is energy needed to start the reactions or is energy given off in the reactions? For each type of reaction, approximately how much energy is released?
2. How do these energy changes compare in scale to other types of reactions, such as chemical reactions?
Part 1
During nuclear reactions, energy is released.To calculate energy changes, use the attached process.Part 2
In nuclear reactions, much more energy is released than in other types of reactions, such as chemical reactions.A certain gas has a molar mass of 28.0 g mol. Calculate the mass of this gas that would fit into a 3.00 litre container at 182 kPa and 47.2 °C?
Answer:
5.74 gm
Explanation:
First, use the ideal gas law PV = n RT
to find the number of moles, then multiply by 28 g/ mole
PV = n RT T must be in Kelvin R = 8.314463 L kPa/(K - Mol)
( make sure you use the R with the correct units!!)
182 kPa * 3 L = n (8.314463 ) ( 273.15+47.2)
solve for n = .205 moles
.205 mole * 28 g/mole = 5.74 gm
The mass of the gas can be calculated using ideal gas law. The mass of the gas is approximately 1.37 g.
What is ideal gas law ?According to ideal gas law, the pressure , volume temperature and number of a moles of a gas is related as :
PV = nRT
To calculate the mass of a gas that would fit into a container at a given temperature, pressure, and volume, we can use the ideal gas law equation:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.
We can rearrange this equation to solve for the number of moles:
n = PV/RT
Once we know the number of moles, we can use the molar mass of the gas to calculate the mass of the gas:
mass = n x molar mass
where molar mass is given as 28.0 g/mol.
Substituting the given values, we get:
n = (182 kPa) x (3.00 L) / [(8.31 J/mol-K) x (47.2°C + 273.15)] = 0.0489 moles
mass = 0.0489 moles x 28.0 g/mol = 1.37 g
Therefore, the mass of the gas that would fit into a 3.00 L container at 182 kPa and 47.2°C is approximately 1.37 g.
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The first four electrons shells fill out in what electron configuration?
Apparently the answer is 2,8,8,2. Why?
Explanation:
2, 8, 8, 2 is the electron arrangement of Calcium.
The way that the "orbitals", the shells, fill up is given as
[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10}[/tex] . . . etc etc.
It is more stable for the fourth shell to start filling up with an electron pair, and then subsequent electrons filling up the third shell again.
So while potassium 19, is 2,8,8,1
And calcium 20, is 2,8,8,2
Scandium 21 will fill up as, 2,8,9,2
This will continue until we reach Zinc 30, which will fill up as 2,8,18,2. The third shell is now "full", and the fourth shell will now being to fill up.
The fourth orbital starts getting filled up again, Gallium 31, is 2,8,18,3
On a cold day a person takes in a breath of 450.0 mL of air at 756 mmHg and -10.0C. Assuming that amount and pressure remain constant, what is the volume of the air when it warms to body temperature (37C) in the lungs?
that science I'm not good really at that
what is called a measurement and does involve a number and unit in chemistry?
Answer:
1.1: Taking Measurements. Chemists measure the properties of matter and express these measurements as quantities. A quantity is an amount of something and consists of a number and a unit. The number tells us how many (or how much), and the unit tells us what the scale of measurement is.
!!
If you add more ammonia, NH3 (ag), to the equilibrium mixture described by the equation here,
what will happen?
2+
2+
Cu(H₂0)6(aq) + 6NH3 (aq) = Cu(NH3) 6 (aq) + 6H₂0(aq)
O It will shift to the right
O It will shift to the left
O It will shift right and left
O It will remain still
Next ▸
If more ammonia is added to the reaction at equilibrium, the equilibrium will shift to the right.
Le Cha-teliar's principleThe principle states that reactions at equilibrium will always adjust to neutralize any effect due to constraints.
Thus, ammonia being a reactant in the reaction will make the equilibrium shift to the right because the reaction will adjust to annul the effects of increasing the concentration of ammonia in the reaction.
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(b) Glycogen may be broken down to form glucose.
Fig.2.2 shows region X from the glycogen molecule in Fig. 2.1 in more detail.
Draw an annotated diagram in the space provided to explain how a glucose molecule is
formed from the free end of the glycogen molecule shown in Fig.2.2
Glycogen is formed by the loss of water molecules along the length of the polymer chain as the glucose molecules are joined together.
How is glycogen formed?Glycogen is formed by a process known as condensation polymerization. This involves the loss of -OH from one glucose molecule and the loss of H from another glucose molecule as the chain is formed.
Hence, glycogen is formed by the loss of water molecules along the length of the polymer chain as the glucose molecules are joined together.
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The empirical formula for a compound is C2H4NO. If its molar mass is 232.2 g/mol, what is the molecular formula of the compound?
Empirical formula mass
C2H4NO2(12)+4(1)+14+1630+24+458g/molMolar mass=232.2g/mol
Find n
Molar mass/Empirical formula mass232.2/584Molecular formula
n×Empirical formula4(C2H4NO)C8H16(NO)_4Find the empirical formula mass
2(12u)+4(1u)+14u+16u58u or 58g/molFind n
Molar mass/Empirical mass232.2/584.05Round to nearest whole
n=4Molecular formula
4(C2H4NO)C8H16N4O4Which symbol represents a type of radiation that has the same mass as an
electron and a positive charge?
OA. e
OB. OY
O C. e
O D. He
Answer:
D.+1°e symbol represents a type of radiation that has the same mass as an electron and a positive charge.
What is the molecularity of the elementary step X + X + Y → Z?
The molecularity of the elementary step X + X + Y → Z is 3.
What is Molecularity ?Molecularity in chemistry is defined as the total number of molecules that react in an elementary reaction .
In the given question the elementary reaction given is
X + X + Y → Z?
or 2X +Y --> Z
X molecule is 2 and Y molecule is 1 so the molecularity is 2+1 = 3
The molecularity of the elementary step X + X + Y → Z is 3.
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For the reaction N2O4(g) 2 NO2(g), Kc = 0.21 at 100 C. At a point during the reaction, [N2O4]=0.12 M and [NO2]=0.55M. Is the reaction at equilibrium? If not, in which direction is it progressing?
The equilibrium constant shows the extent to which reactants are converted into products.
In this case, we must find the reaction quotient as follows;
Qc = [0.55]^2/[0.12] = 2.5
Since the Qc > Kc, it means that the reverse direction is favored in this reaction.
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lodine-131 is a radioactive isotope with a half-life of 8 days. How many grams of a 50 g sample will be left after 48 days?
Answer:
0.805 or 0.781 depending on the method used.
Explanation:
Data provided
half life ie t1/2= 8days.
No= 50g
t=48days
Nt=?
Method 1
Formula: Nt= No(1/2)^n
where n= number of half lives.
= t/t1/2 = 48/8
=6.
thus Nt= 50(1/2)^6= 0.781
Method 2
Formula: Nt= Noe^-(lambda)t
where lambda= decay constant
= ln2/ t1/2= ln2/ 8 = 0.086.
thus Nt= 50e^-(0.086×48)= 0.805.
The energy of a photon is 4.23 x 10-17 J. What is the wavelength of the radiation?
The wavelength of the radiation is 4.7 x 10⁻⁹ m
What is the Einstein's Formula for Energy?
The energy
E is given, from Einstein's formula, as:
E=h⋅ν
Where:
h=6.63×10⁻³⁴Js is Planck's constant;
ν is the frequency.
You can relate frequency and wavelength
λ through the speed of light c as:
c=λ⋅ν
So finally you get:
E=hc/λ
It is given in the question
The energy of a photon is 4.23 x 10⁻¹⁷ J.
Wavelength = ?
λ = hc/E
λ = 6.63×10⁻³⁴x 3 x 10⁸ / 4.23 x 10⁻¹⁷
λ = 4.7 x 10⁻⁹ m
Therefore the wavelength of the radiation is 4.7 x 10⁻⁹ m .
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1) H₂(g)+Br₂(g)➝2HBr(g) has a heat of reaction of ___ kJ.
2)CH₄(g)+I₂(g)➝CH₃I(g)+HI(G) has a heat of reaction of ___kj.
3)N₂H₄(I)+O₂(g)➝N₂(g)+ 2 H₂O(g) has a heat of reaction of __kj.
see the attached file!!
How do I create an atom with a mass of 3 and a neutral charge?
Answer:
a lithium atom (Z=3, A=7 AMU) contains three protons (found from Z), three electrons (as the number of protons is equal to the number of electrons in an atom), and four neutrons (7 – 3 = 4).
Explanation:
Atoms are spherical in shape. Therefore, the Pt atoms in the cube cannot fill all the available space. If only 74.0 percent of the space inside the cube is taken up by Pt atoms, calculate the radius in picometers of a Pt atom. The mass of a single Pt atom is 3.240 × 10−22 g. [The volume of a sphere of radius r is (4/3) πr3. The volume of a cube is l3, where l is the length of a side. Avogadro's number is 6.022 × 1023.]
Answer:
Answer:
A)6.6×10^22atoms of Pt in the cube
B)1.4×10^-8m
Explanation:
(a) Calculate the number of Pt atoms in the cube.
an edge length of platinum (Pt) = 1.0 cm.
Then Volume= 1.0 cm×1.0 cm×1.0 cm=1cm^3
Then we have volume of the cube as 1cm^3
Given:
The density Pt = 21.45 g/cm3
the mass of a single Pt atom =3.240 x 10^-22 g
Then with 1atom of the platinum element, we can calculate the number of Pt atoms in the cube as
Density of pt/mass of a single Pt atom
=(21.45 /=3.240 x 10^-22)
=6.6×10^22atoms of Pt in the cube
B)Volume of cube V=4/3πr^3
V= 4/3 ×π×r^3
V= 4.19067r^3
r^3= V/4.19067
But volume is not total volume but just 74% of it, then With 74% of the space inside the cube is taken up by Pt atoms, then we need to find 74% of volume of the cube which is 1cm^3
74/100 ×1= 0.74cm^3
Then our new volume V is 0.74cm^3
r^3=0.74/4.19067×6.620 x 10^22
r^3=2.6674×10^-24
r= 3√2.6674×10^-24
r=1.4×10^-8m
3) A gas has a volume of 15.0 mL at a pressure of 1.05 atm. What is the volume of the gas at
a pressure of 0.450 atm?
Answer:
V⬇2=64.mL this is the answer and the 2 is supposed to be at the bottom which the arrow stands for so do not put the arrow with that
Why do Earth and the moon remain in orbit?
Answer:
because of gravitional force(gravity)........
Which of the following best defines balanced forces?
A. Forces that act in opposite directions and cancel each other out
B. Unequal forces that do not cancel out and that cause a change in
motion
OC. The total force on an object after individual forces are added
together
D. Forces between two objects in physical contact
Answer:
Balanced forces are forces that act in opposite directions and cancel each other out
let me know if you have any other questions
Answer:
Discuss about Library Automation Life cycleExplanation:
8. Which conditions in the atmosphere would cause smoke from a campfire on a beach to blow toward the ocean?
Answer:
warm air over the land and cool air over the ocean.