Answer:
0.967mole
Explanation:
Given parameters:
Volume of NH₄Cl = 21.67L
Unknown:
Number of moles = ?
Solution:
We assume that the volume was taken at standard temperature and pressure,
Then;
Number of moles = [tex]\frac{volume }{22.4L}[/tex]
Number of moles = [tex]\frac{21.67}{22.4}[/tex] = 0.967mole
The number of valence electrons in lithium is 2.
TRUE
FALSE
Answer:
False
Explanation:
Ok then what im bored
Calcium is a metal that is part of bone. it has several naturally-occurring
isotopes. Calculate the average atomic mass. Ca-40 39.96amu 96.941%,
Ca-42, 41.96 amu 0.647%, Ca-43 42.96amu 0.135% Ca-44 43.96 amu
2.086%, Ca-48 47.95amu 0.187% *
pls help
The average atomic mass of Ca : 43.943 amu
Further explanationGiven
Isotopes of Ca
Required
The average atomic mass
Solution
Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
Avg atomic mass = m1.%m1 + m2.%m2....mn.%mn
m1 = isotope 1
m2 = isotope 2
% = abundance of the elements in nature
Input the value :
avg atomic mass = 39.96 x 0.96941 + 41.96 x 0.0647+42.96 x 0.0135 + 43.96 x 0.02086 + 47.95 x 0.0187
avg atomic mass =43.943 amu
pls help me i dont understand this question
Answer:
Explanation:
I'm not sure, don't hate me if i'm wrong but i think the third one is the answer.
Answer:
The question is asking what does not have anything to do with the bond formation.
MULTIPLE CHOICE QUESTION
Electrons fill in energy levels in which of the
following ways?
1.Lowest energy level first, so it fills in the inside
rings first
2.Lowest energy level first, so it fills in the
outside rings first
3.Highest energy level first, so it fills in the inside
rings first
4.Highest energy level first, so it fills in the outside
rings first
Answer:
I think the answer is 3. Highest energy level first, so it fills in the inside rings first
Electrons occupy the lower-energy orbitals first, then go on to fill the next higher-energy orbital until all of the electrons contain been placed.
Which energy levels do electrons fill first?Most of the time, electrons occupy the lower-energy orbitals first, then go on to fill the next higher-energy orbital until all of the electrons have been positioned.
The lowest energy level is always added to initially until it has as many electrons as it can have. The following higher energy level is then filled with electrons, and so on.
The lowest energy level is always filled up with additional electrons first, up to the point where that level can hold no more, and then further electrons are added to the next higher energy level, and so on. A level's total number of orbitals determines how many electrons can be present at that energy.
Therefore, the correct answer is option 3. Highest energy level first, so it fills in the inside rings first.
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What happens when the compound Mgo is formed? (5 points)
Oxygen transfers two electrons to magnesium.
Oxygen receives two electrons from magnesium.
Magnesium forms an ion with -1 charge; oxygen forms an ion with +1 charge.
Magnesium forms an ion with +1 charge; oxygen forms an ion with -1 charge.
Answer:
Oxygen receives two electrons from magnesium.
Explanation:
Hello!
In this case, considering the chemical reaction by which magnesium oxide is produced:
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
In that case, if we show up the oxidation states, we have:
[tex]2Mg^0+O_2\rightarrow 2Mg^{2+}O^{2-}[/tex]
In such a way, since metals, like magnesium, have the capacity to lose electrons, rather than receive them, we infer why it turns out with +2 rather than -2; thus, we the correct answer is "oxygen receives two electrons from magnesium." because it results with -2 in MgO.
Best regards!
Answer:
Oxygen receives two electrons from magnesium.
Explanation:
If we react 5.4g of sodium chloride with an unknown amount of fluorine gas, we produce 4.9g of sodium fluoride and 3.7g chlorine gas. How much fluorine was consumed in the reaction?
Answer:
4.43 g
Explanation:
The reaction between sodium chloride and flourine gas is given as;
NaCl + F2 --> NaF + Cl2
From the stochiometry of the equation;
1 mol of NaCl reacts eith 1 mol of F2 to form 1 mol of NaF and Cl2
Mass of 1 mol of F2 = 38g
Mass of 1 mol of sodium flouride, NaF = 42g
This means 38g of flourine reacted with NaCl to form 42g of NaF
xg of F2 would form 4.9g of NaF
38 = 42
x = 4.9
x = 4.9 * 38 / 42
x = 4.43 g
PLEASE HELPP!!
Consider the reaction below.
2 Na + O2 → Na2O2
If 10.0 g of sodium metal reacts with excess oxygen gas how many grams of sodium oxide will be produced?
Show your work below. Make sure to show ALL units and each step of the process:
Answer:
Answer: The correct answer is Option B.
Explanation:
To calculate the number of moles, we use the equation:
\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}Number of moles=Molar massGiven mass ....(1)
For N_2N2 :
Given mass of nitrogen gas = 10 g
Molar mass of nitrogen gas = 28 g/mol
Putting values in above equation, we get:
\text{Moles of iron oxide}=\frac{10g}{28g/mol}=0.357molMoles of iron oxide=28g/mol10g=0.357mol
The given chemical reaction follows:
N_2+O_2\rightarrow 2NON2+O2→2NO
As, oxygen gas is present in excess. Thus, it is considered as an excess reagent and nitrogen is considered as a limiting reagent because it limits the formation of products.
By Stoichiometry of the reaction:
IF YOU COME THEN YOU WILL GET BRAINLIEST HURRY!!!!
Describe how wind, water, ice and gravity move soil through erosion below.
Answer:
It's big brain time
Explanation:
Weathering is the process of breaking rocks into sediment while erosion is the process that wears away this sediment and other materials and moves them from one location to another. Agents of erosion include gravity, glaciers, wind, and water. Erosion only occurs when these agents have enough energy. The moment agents of erosion lose their energy and momentum they deposit their load. This process is known as deposition. The load is what the agent is carrying. As agents of weathering lose their energy, the heavier sediment is dropped. As the energy is lost, gravel, then sand, then silt, and then clay are deposited, due to their respective masses.
Mass movement, sometimes referred to as mass wasting, is what we call the movement of surface material due to gravity, water, wind, and ice. There are five main types of mass movements: falls, creep, flows, slides, and slump.
Which set of the below elements are in the same period.
1. Li, Be, C, O
2. H, Li, Be
3. F, CI, Br, I
4. H, He, Li, Be
1
Explanation:
because they period two
Answer:
1
Explanation:
what volume of carbon dioxide will be collected at stp when 25.6 g of calcium carbohydrate undergoes decomposition? Balanced reaction: CaCO2 -> CaO + CO2
Answer:
V = 5.74 L
Explanation:
Given data:
Volume of carbon dioxide produced = ?
Temperature and pressure = standard
Mass of calcium carbonate = 25.6 g
Solution:
Chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of calcium carbonate:
Number of moles = mass / molar mass
Molar mass of calcium carbonate = 100 g/mol
Number of moles = 25.6 g/ 100 g/mol
Number of moles = 0.256 mol
Now we will compare the mole of calcium carbonate with carbon dioxide.
CaCO₃ : CO₂
1 : 1
0.256 : 0.256
Volume of CO₂:
PV = nRT
R = general gas constant = 0.0821 atm/L / mol.K
By putting values,
1 atm× V = 0.256 mol × 0.0821 atm/L / mol.K× 273.15 K
V = 5.74 atm/L / 1 atm
V = 5.74 L
2. Explain how conduction, convection and radiation all contribute to heating the Earth's
surface and atmosphere.
Answer: Conduction, radiation and convection all play a role in moving heat between Earth's surface and the atmosphere. Since air is a poor conductor, most energy transfer by conduction occurs right near Earth's surface. ... During the day, sunlight heats the ground, which in turn heats the air directly above it via conduction.
HOPE THIS HELPS
What is the volume of 0.128 mol of nitrogen dioxide gas at STP?
A) 0.00571 L
B) 2.87 L
C) 5.89 L
D) 132 L
Answer:
B) 2.87 L
Explanation:
A mole of any gas at STP has a volume of about 22.412 liters. So, 0.128 moles of gas will have a volume of ...
0.128 · 22.412 L ≈ 2.87 L
Answer:
B. 2.87 LExplanation:
the volume of 0.138 mol of nitrogen dioxide gas at STP is equal to...2.87 L/litreThe element fluorine has an atomic number of
a. 10
b. 9
c. 19
d. 28
Answer:
B.9
Explanation:
Which statement accurately represents the properties of these moles.. help ASAP, teacher didn’t teach me this
Answer:
1 mole of O₂ has more mass compared to 1 mole of Na
Explanation:
1 mole oxygen atom and 1 mole of Na atom has the same number of particles.
A mole of any substance has the Avogadro number of particles which is
6.02 x 10²³
Mass of a substance = number of moles x molar mass
Molar mass of O₂ = 2(16) = 32g/mol
Molar mass of Na = 23g/mol
Mass of O₂ = 1 x 32 = 32g
Mass of Na = 1 x 23 = 23g
So, 1 mole of O₂ has more mass compared to 1 mole of Na
Here is a model that shows key information about Earth
and the Sun
Direction of
Earth's rotation
Axis
Which statement best explains the pattern of daytime and nighttime on
Earth?
A. The Sun must revolve around Earth once every 24 hours
B. Earth's axis of rotation must tilt back and forth every 12 hours.
C. Earth must complete one rotation on its axis every 24 hours.
D. The Sun's energy must come from a different direction every 12
hours
The statement information about earth and the sun direction of earth's rotation axis best explains the pattern of daytime and night-time on earth is " earth must complete one rotation on its axis every 24 hours".
What is sun?The sun was composed of incredibly hot gases, as well as then it heats as well as illuminates the entire solar system.
What is earth?The earth was referred to as a "one-of-a-kind" planet since that is the only one on the planet with ideal circumstances for life.
Day though night are caused by the Earth's diurnal revolution. From west to east, the earth rotates on its axis for around 24 hours. As a result, the sun appears to rotate from east to west, resulting in sunset and sunrise. except for polar is, which remains stationary in the north polar sky along the earth's axis, all those other stars move from east to west.
Therefore, the correct answer will be C.
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Answer:
THE ANSWER IS (C.)
Explanation:
The diagram shows a parent hydra with an offsprinly.
Offspring
Which statement best explains why the offspring has no genetic variation
from the parent?
A. It received genes for producing traits different from the parent's.
B. It received a mix of genes from two different parents.
O C. It received genes that are exactly the same as the parent's genes.
O D. It received chromosomes with many different genes.
Answer:
C. It received genes that are exactly the same as the parent's genes
In asexual reproduction in hydra,offspring has no genetic variation from the parent because it received genes that are exactly the same as the parent's genes.
What is asexual reproduction?Asexual reproduction is a type of reproduction where the offsprings are not produced by the combination of genetic material of two individuals which are of different sexes rather they are produced by a single parent.
It is the not the dominant form of reproduction in living beings.Here, the offsprings are identical to their parents as there is no recombination of genetic material.It is observed in both unicellular or multicellular organisms.
There is no fertilization or gamete formation taking place.Types of asexual reproduction include budding, binary fission,fragmentation,etc.
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And this one please thank you.
Answer:
E
Explanation:
Look at bottom numbers.
90 → 88 + x
it means,
90=88+x
hence x = 2
it is also valid for top numbers.
230=226+y
y = 4
The concentration of KIO3 in solution A is 0.04 M. Calculate the number of moles of potassium iodate in 1 mL of this solution.
Answer:
Number of moles of KIO₃ = 4.0×10⁻⁵ mol
Explanation:
Given data:
Concentration of solution = 0.04 M
Volume of solution = 1 mL
Number of moles of KIO₃ = ?
Solution:
Molarity = concentration
Molarity = number of moles / volume in L
We will convert the volume into L.
1 mL×1 L /1000 mL
0.001 L
Now we will put the values in formula,
0.04 M = number of moles / 0.001 L
Number of moles = 0.04 M ×0.001 L
Number of moles = 4.0×10⁻⁵ mol
How many grams of zinc chloride will be produced from 55. grams of zinc assuming hydrochloric acid is available in excess
Answer:
Mass = 114.5 g
Explanation:
Given data:
Mass of zinc = 55 g
Mass of ZnCl₂ produced = ?
Solution:
Chemical equation:
Zn + 2HCl → ZnCl₂ + H₂
Number of moles of Zn:
Number of moles = mass/molar mass
Molar mass of Zn = 65.4 g/mol
Number of moles = 55 g/ 65.4 g/mol
Number of moles = 0.84 mol
Now we will compare the moles of Zn and zinc chloride,
Zn : ZnCl₂
1 : 1
0.84 : 0.84
Mass of ZnCl₂:
Mass = number of moles × molar mass
Molar mass of ZnCl₂= 136.3 g/mol
Mass = 0.84 mol × 136.3 g/mol
Mass = 114.5 g
Much of the light that a black cloth absorbs is changed to heat. True or false
Answer:
True
Explanation:
Hope this helps you complete the quiz :)
Pls predict and balance the following Chemical equations 30points (5 per question)
Will mark Brainliest
1. Na2(SO4) (aq) + Ba(NO3)2(aq) -->
2. Na(NO3)(aq) + NH4Cl(aq) -->
4. ZnCl2 (aq) + K (SO4) (aq) -->
5. ZnCl2 (aq) + Na2S (aq) -->
6. Na(C2H3O2) (aq) + Ag(NO3) (aq) -->
Answer:
1. Na2SO4 + Ba(NO3)2 → NaNO3 + BaSO4
2. NaNO3 + NH4Cl → NaCl + NH4NO3
4. Sorry, I don't know
5. Refer to the attachment..
6. NaC2H3O2(aq) + AgNO3(aq) = NaNO3(aq) + AgC2H3O2
Hope it can help you and please mark me as a brainlist...[tex] \huge{\blue{Thank \: you}}[/tex]
if you heat a liquid measure the temperature to which it boils what am I measuring
Help me please O w O
Answer:
42 km/h
Explanation:
4. How many moles in 2.0 x 1023 atoms of H2O?
here.
Answer:
0.33 moles
Explanation:
to find the number of moles,
moles = number of atoms / avogadro's number ie 6.02 x [tex]10^{23}[/tex]
moles = 2.0 x [tex]10^{23}[/tex] / 6.02 x [tex]10^{23}[/tex]
moles = 0.33 mol
The following diagram shows the bonds that make up potassium acetate.
Answer:
6
Explanation:
ye
A certain atom has 50 protons and 69 neutrons. Which statement(s) below are true about this atom? Choose ALL that apply.
this atom is an atom of thulium (Tm)
m this atom has a mass of 69 amu
this atom is an isotope of tin-120
m this atom has an atomic number of 50
Answer:
D.) This atom has an atomic number of 50
Explanation:
A is wrong because we determine the type of atom by their number of protons, not the number of neutrons. This makes the atom Tin (Sn).
B is wrong because both protons and neutrons contribute to the weight of an atom, not just neutrons
C is wrong because the correct name for this isotope would be tin-119, which is calculated by adding the protons and neutrons
D is correct because isotopes of the same element always share the same atomic number
Plss answer the question in the picture. If you actually answer I will give you brainilest!!!
Answer:
hey :)
your answer is D.
Explanation:
To find density, you must divide mass and volume.
8 divided by 4 is 2
6 divided by 6 is 0
4 divided by 2 is 2
hope i helped any :))
What are the products of the combustion of a hydrocarbon?
carbon and oxygen
carbon dioxide and water
carbon and hydrogen
carbon dioxide and hydrogen
Answer:
I think carbon and hydrogen
Answer:
Its carbon and hydrogyen
Explanation:
got it right on edge
1.which electromagnetic wave has the; longest wavelength, lowest speed, highest frequency, and greatest energy ?
2. Which visible light wave has the; longest wavelength, lowest speed, highest frequency, and greatest energy?
(Please Help I would gladly appreciate it 100 points will be given)
which part of this chemical process requires energy WILL GIVE BRAINLIEST
Answer:
Its c hope this helps ;)
Explanation:
Answer:
Answer is D
Explanation:
Am smort