Iron-55 (55Fe) is a radioactive isotope of iron with a nucleus containing 26 protons and 29 neutrons.
Answer:
54
Explanation:
yep
A sample of SO2 gas occupies 45.6 L at 373 K and 3.45 atm. How many moles of oxygen atoms?
Answer:
10.3
Explanation: i have this as a assignment rn sooo here you go :)
calculate the number of moles of ethanol acid in 30 cm³of 1 mol dm-³ solution
Answer:
May I assume "ethanol acid is just ethanol (it has one slightly acidic H atom). If so, the molar mass is 46.02 g/mole.
Explanation:
We have 30 cm^3 [30 ml] of 1.0 M (1 mole/liter) [1 dm³ = 1 liter].
That is 1 mole/liter. 30 ml would contain (0.030 liter)*(1 mole/1 liter) = 0.03 moles.
Why was the creation of element 114 so special?
Answer:
It is classified as a metal and is expected to be solid at room temperature.
Explanation:
not sure but i guess it is that
how do atoms achieve noble-gas configurations in single covalent bonds
Answer:
by sharing an electron
Explanation:
each of the two bonded atoms share an electron....making a single covalent bond b/w the two....like in....F - F
Help me please! I’m
In my own breakout room doing this like the other kids NOW HELP!
Answer:
Sun
Explanation:
Answer:
earth
Explanation:
1. What is the specific heat of a substance that requires 270 J of energy to raise the temperature of 4.2 grams by 25°C?
Heat required is mcΔT=100×0.39×50=1950 J
Solve any question of Thermodynamics with:-
The specific heat of the substance that requires 270 J of energy to raise the temperature is 2.57 J/g⁰C.
Specific heat capacity of the substanceThe specific heat capacity of the substance is calculated as follows;
Q = mcΔФ
where;
c is the specific heat capacityc = Q/mΔФ
c = (270) / (4.2 x 25)
c = 2.57 J/g⁰C
Thus, the specific heat of the substance that requires 270 J of energy to raise the temperature is 2.57 J/g⁰C.
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How many grams of solute are needed to order to prepare 100.00 mL of a 0.1000 M solution of a compound with a molecular weight of 350.0 g/mol
Answer:
i got 35 but i am as lost as you are so don't really take my answer as a trusted answer
The grams of solute are required.
The mass of solute is 3.5 g
c = Molarity = 0.1 M
M = Molar mass = 350 g/mol
V = Volume of solution = 100 mL = 0.1 L
n = Number of moles
m = Mass of solute
Molarity is given by
[tex]c=\dfrac{n}{V}\\\Rightarrow n=cV\\\Rightarrow n=0.1\times 0.1\\\Rightarrow n=0.01\ \text{moles}[/tex]
Molar mass is given by
[tex]M=\dfrac{m}{n}\\\Rightarrow m=Mn\\\Rightarrow m=350\times 0.01\\\Rightarrow m=3.5\ \text{g}[/tex]
The mass of solute is 3.5 g
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how many grams of lead (ii) iodide will be precipitated by adding sufficient Pb(NO3)2 to trace with 630mL of 0.268M Ki solution?
2KI(aq)+Pb(NO3)2(aq) → PbI2+2KNO3(aq)
The mass of PbI2 produced from a trace amount of 630mL of 0.268M KI solution is 39.2 g.
The equation of the reaction is; 2KI(aq)+Pb(NO3)2(aq) → PbI2(s) + 2KNO3(aq)
From the question, number of moles of KI = 630/1000 L × 0.268M = 0.169 moles
Now;
2 moles of KI is required to precipitate 1 mole of PbI2
0.169 moles of KI is required to precipitate 0.169 moles × 1 mole/2 moles
= 0.085 moles
Mass of PbI2 = Number of moles of PbI2 × Molar mass
Mass of PbI2 = 0.085 moles × 461.01 g/mol
Mass of PbI2 = 39.2 g
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What type of rays result in shorter days? (science)
Answer:
verical rays
Explanation:
The rays result in shorter days are the vertical rays.
What are vertical rays ?Vertical rays are another name for direct rays. Rays that are straight overhead are referred to as vertical. Because the Earth is spherical, not all the Sun's rays hit it directly or vertically.
Vertical rays lose less heat because they cover a shorter distance. Slanted rays cover more ground and dissipate more heat. Sun's vertical rays fall between the Tropics of Cancer and Capricorn, along its migratory belt.
The length of a day is determined by the Earth's rotation around its axis, which has been accelerating during the past several decades. Our days have been becoming shorter due to this tendency.
Thus, vertical rays are responsible for shorter days.
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please help me with this question as it's really important
Answer:
(i)
A → CH3CH2CH3 ( Propane )
B → CH3CH(Cl)CH3 ( 2-Chloropropane )
C → No product
D→ CH3CH=CH2 ( 2-propene )
E → CH3CH2COOH ( Propanoic acid )
(ii)
Reagent X → Acidified water [ H+ / H2O ]
Reagent Y → Bromine with Carbon tetrachloride [ Br2 / CCl4 ]
Reagent Z → Sodium hydroxide [NaOH]
A 1,100 kg car comes uniformly to a stop. If the vehicle is accelerating at 2 1.2 m/s , which
force is closest to the net force acting on the vehicle?
F 9,600 N
G 1,300 N
H 900 N
J 94 N
help me please?????
HELP!!!! I need help with number 11 and 12
Answer:
V1/n1 = V2 /n2
0.236/0.306 = V2/ 4.40
V2 = 3.39 L
Describe how the production of a gas (carbon dioxide) suggests a chemical change
occurred?
(6) Predict the number of valence electrons for each of the following elements (4 pts)
(a) P
(b) Ar
(c) c
(d) Ni
Answer:
P = 5, Ar = 8, C = 4, Ni = 2
Explanation:
All these answers can be based off which column of the periodic table each element is in. This does exclude the transition medals in between the 2nd and 13th columns. Column 1 = 1, Column 2 = 2, Column 3 = 3 and so on. Transition metals can be determined based on their electron configuration, which in this case, Ni has 2 electrons in its outer most shell.
Which statements accurately describe elements? Check all that apply.
Elements are made up of two or more types of atoms.
Elements are made up of only one type of atom.
Each element has a unique chemical symbol.
Elements can be identified by their atomic number.
One element cannot be combined with another element.
Answer:
Elements are made up of only one type of atom. Each element has a unique chemical symbol. Elements can be identified by their atomic number.Explanation:
According to the following map, what is a type of mineral found in Mexico?
a | Bauxite
b | Copper
c | Gold
d | Zinc
Answer:
B) copper
Explanation:
According to the map, iron, silver, and copper are found in Mexico. That makes B) copper your answer, as it is the only one that shows up for both the answer choices as well as the map.
What is the wavelength, in nm, of the light photon emitted by a hydrogen atom when an electron goes from n
Answer:
Hence, the wavelength of the photon associated is 1282 nm.
Explanation:
a car accelerates from rest(zero speed) up to a spees of m/s to a speed of 30 m/s in 12 seconds. calculate the acceleration.
1) Calculate the average speed in meters/minute for the trip represented
by the walk graphed here.
e
A) 0.5m/min
B) 1m/min
C)
5m/min
nber as you
D) 30m/min
has only
quantity and has
2) What is the average velocity of the person taking this walk?
Answer:
in physics we never work with minutes only seconds.
what is the name of an orchestra that performs the ceremonial music of the royal courts and templates of cambodia
a.ankor wat
b.oneat
c.pinpeat
d.samphor
Answer:
pinpeat
According to 3 sources
The pinpeat (ពិណពាទ្យ) orchestra or musical ensemble performs the ceremonial music of the royal courts and temples of Cambodia. The orchestra consists of approximately nine or ten instruments, mainly wind and percussion (including several varieties of xylophone and drums)
Explanation:
PA BRAINLIEST
a stone is projected horizontally with 20 metre per second from the top of a tall building calculate its position in velocity after 3 seconds neglecting the air resistance .
Answer:
105m
Explanation:
u=20m/s
g=10m/s^2
t=3s
s=ut+1/2gt^2at
s=20*3+1/2*10*3*3
s=105m
What do you already know about throwing a curveball?
Answer: You have to have good mechanics as well as the curve with velocity and speed.
The MLB Pitchers you see can be an example.
Commentators yelling Nasty Curveball, Strikeout!!
Which list includes only bulk properties of matter?
boiling point, strength of electrical forces, vapor pressure
kinetic energy, strength of electrical forces, vapor pressure
boiling point, surface tension, vapor pressure
boiling point, kinetic energy, surface tension
The list which includes only bulk properties of matter is: C. boiling point, surface tension, vapor pressure.
What is matter?
Matter can be defined as anything that has mass and can occupy space.
Thus, any physical object or substance that is found on planet Earth is typically composed of matter.
The three (3) states of matter:
Since all matter are made up of atoms, they have a property of existing in three (3) distinct states and these include;
SolidGasLiquidA bulk property of matter refers to the property that affects matter as a whole and they are listed as follows:
1. Stress
2. Strain
3. Elasticity
4. Boiling point
5. Surface tension
6. Vapor pressure
In conclusion, the other list of properties are not a bulk property of matter.
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What is the relationship between Avogadro number, mole, and mass number?
An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atomic mass, and net charge?
Answer:
Atomic number: 26
Atomic mass: 56
Net charge: +3
Explanation:
A 0.100 g sample of phosphoric acid (H3PO4, MW 99.0 g/mol), a tri-protic acid, requires 35.0 mL of a NaOH solution for neutralization. What is the molarity of the NaOH solution
Answer:
0.0866 M
Explanation:
answer key
The molarity of the NaOH solution has been 0.0865 M.
The neutralization reaction of the Phosphoric acid and NaOH results in the formation of sodium phosphate and water.
The balanced chemical equation can be given as;
[tex]\rm H_3PO_4\;+\;3\;NaOH\;\rightarrow\;Na_3PO_4\;+\;3\;H_2O[/tex]
Thus for the neutralization of 1 mole of Phosphoric acid, 3 moles of NaOH has been used.
The moles of phosphoric acid in 0.100 grams sample:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of phosphoric acid = [tex]\rm \dfrac{0.100}{99}[/tex]
Moles of phosphoric acid = 0.001 mol
For the neutralization of 0.001 moles of NaOH:
1-mole Phosphoric acid = 3 moles NaOH
0.001-mole Phosphoric acid =0.003 moles of NaOH.
The molarity of the NaOH solution:
Molarity = [tex]\rm \dfrac{moles}{Volume\;(L)}[/tex]
Molarity of NaOH = [tex]\rm \dfrac{0.003}{0.035}[/tex]
Molarity of NaOH = 0.0865 M
The molarity of the NaOH solution has been 0.0865 M.
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1. A box of hardware contains 100 pieces. Assuming there are 25 pieces in each vial, calculate the
mass of a box of each kind of hardware. Express these values in units of g/box
Answer:
fofo you for your patience and
The question is incomplete.
Following things are required to solve the question:-
Mass of the vileMass of the piecesWithout the information we can not solve the question. Therefore, please provide with the incomplete information.
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why don't birds get electrocuted when they land on the electric wire?
Answer:
Birds can sit on power lines and not get electric shocks because the electricity is always looking for a way to get to the ground. The birds are not touching the ground or anything in contact with the ground, so the electricity will stay in the power line.
Pls mark as brainliest answer if it helps you
During ionization, metals lose electron, this change is called?
Ans
This is called oxidation
Explanation:
the oxidation number of a metal ion is more than the oxidation number of metal atom