Answer:
i do not no
Explanation:
sorry i do not known
In chemistry experiment it is determined that 4.2 moles of aluminum oxide are needed to completely react with a sample of sodium. How many molecules of aluminum oxide are there in 4.2 moles? After an experiment, 35.6 g of carbon were recovered. How many moles of carbon is this?
Answer:
Aluminium Oxide = 2.5×10²³ molecules
Carbon = 2.96 moles
Explanation:
1 mole of aluminium oxide contains 6.02× 10²³ molecules, hence 4.2 moles will contain 4.2 ×6.02×10²³ molecules
for carbon, number of moles = Mass/ Molar Mass = 35.6/12.01 = 2.96 mole
Who is Gregor Mendeſ, and what did he
discover about traits?
Answer:
Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.
Through his careful breeding of garden peas, Gregor Mendel discovered the basic principles of heredity and laid the mathematical foundation of the science of genetics.
Explanation:
How many moles of Ar atoms are there in 202 L of Ar gas at STP? A) 1.20 x 1024 mol B) 1.11 x 10-1 mol C) 4.52 x 103 mol D) 9.02 mol E) 1.79 mol
a
1.20 x 1024 moles
b
9.02 mol
c
1.11 x 10-1 mol
d
4.52 x 103 mol
Answer:
4.52 x 10^3 mol
Explanation:
BABABOOEY
9.02 moles of Ar atoms are there in 202 L of Ar gas at STP. Therefore, option B is correct.
What do you mean by mole ?The term mole is refer to the amount of substance of a system which includes as many elementary entities.
One mole of any substance is exactly equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
The mole concept can be used to convert between mass and number of particles.
Given:
At STP volume of Argon gas is 22.4 litre
Volume of Argon gas = 3.36 L
At STP ,
Temperature = 0°C
= 273.15 K
Pressure = 1 bar
= 0.986923 atm
R = gas constant
R = 0.08206 L atm K-1 mol-1
= 202 L × 1 mole / 22.4 L
= 9.01 mol
≅ 9.02 mol
Thus, option B is correct.
To learn more about the mole, follow the link;
https://brainly.com/question/26416088
#SPJ6
HELP ME PLEASE ILL MARK BRAINLEST
Answer:
Tissues And Organ Systems I Have Answered This Question Before-
Explanation:
Help me answer this question for points!
Answer:
I am pretty sure Danny Duncan told me 69
Explanation:
niice
True or false: Some parasites are able to change the behavior of their host, which often helps the parasite complete some part of their life cycle
The Himalayan mountain range found at the junction of India and Asia is an example of a
(1 point)
a.convergent boundary
b.divergent boundary
c.transform boundary
d.normal boundary
Answer: A : Convergent
Explanation:
Helppppppp. much needed help lol
Answer:
Isotope
Explanation:
Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.
Based on its position in the table, with which other element do you think calcium might react?
A. Sulfur
B. Fluorine
C. Nitrogen
Answer: sulfer
Explanation:
this had me thinking
what is smaller than an atom... is there really anything smaller than an atom??!! i dont think there is is there?
Answer:
the protons, neutrons, and electrons that make up the atom?
Explanation:
what is the chemistry of acid and base
Answer:
Of what?
Explanation:
But uhh: An acid is a substance that donates protons or accepts a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids.
Please help me answer these true or false chemistry questions!! 33 points!!
1) Galium's (Ga) electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1 = TRUE OR FALSE
2) Galium has two valence electrons = TRUE OR FALSE
3) Iridium electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d7 = TRUE OR FALSE
4) Iridium (Ir) has two valence electrons = TRUE OR FALSE
5) Oxygen's orbital notation is 1sX 2sX 2pX// = TRUE OR FALSE
6) Scandium's (Sc) orbital notation is 1s2 2s2 = TRUE OR FALSE
7) Carbon (C) noble gas abbreviation is [Rn] 7s2 = TRUE OR FALSE
8) Neon's (Ne) noble gas abbreviation is [Xe] 6s2 4f6 = TRUE OR FALSE
9) Lithium's noble gas abbreviation is [He] 2s1 = TRUE OR FALSE
10) The long form electron configuration of Iodine ion with a -1 charge (I^-1) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 = TRUE OR FALSE
11) Iodine ion with -1 charge is isoelectronic with Neon = TRUE OR FALSE
12) Calcium ion with +2 charge's (Ca^+2) electron configuration is 1s2 2s2 2p6 3s2 3p6 = TRUE OR FALSE
13) Calcium ion with +2 charge is isoelectronic with Argon (Ar) = TRUE OR FALSE
14) Helium's Electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 = TRUE OR FALSE
15) Helium is isoelectronic with Xenon (Xe) = TRUE OR FALSE
16) The neutral 1s2 2s2 2p6 3s2 3p5 atom is Cl = TRUE OR FALSE
17) The atom with the -1 charge and the electron configuration 1s2 2s2 2p6 3s2 3p6 is Cl-1 = TRUE OR FALSE
18) The atom with the -3 charge and the electron configuration of 1s2 2s2 2p6 3s2 3p6 is P^-3 = TRUE OR FALSE
19) The quantum number for Chlorine ion with -1 charge is (3, 1, +1, -1/2) = TRUE OR FALSE
Thanks to anyone that answers!!
Answer: 1) True
2) False 4)False 5)True
Explanation: I took a test that had similar questions
please help if you can
2H2(g) + O2(g) → 2H2O(l)
The chemical equation above describes a(n)__________.
A). endothermic change
B). reversible state change
C). chemical change
D). physical change
Answer:
i cants bye
Explanation:
byeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
what is dilution?..............
Answer:
di·lu·tion
the action of making a liquid more dilute.
"the milk factor is greatly reduced by dilution"
Energy for this ecosystem originally comes from
A. water
B. consumers
C. sunlight
D. plants
Answer:
sunlight is the answer i think
What is an atom? Is it stable? Give reasons to support your answer.
If the molecules of two different substances have a similar size but the molecules of one substance are polar while the molecules of the other substance are nonpolar, what is most likely true about the substances? A. The polar substance has a lower boiling point than the nonpolar substance. B. The nonpolar substance has a lower boiling point than the polar substance. C. Both substances have similar volatilities. D. Both substances have similar solubilities
Answer:
B. The nonpolar substance has a lower boiling point than the polar substance
Explanation:
i just took the test review on edge 2020 and i got it right :)!! so sorry this answer is a little late ::
Which model failed to explain the
attraction between some
substances?
the model of Dalton
the model of Thomson
the Bohr-Rutherford model
all of the above
Answer:
C). The Bohr-Rutherford model
Explanation:
The 'Bohr-Rutherford model' of the atom failed to elaborate on the attraction between some substances. It essentially targeted hydrogen atoms and failed to explain its stability across multi-electrons. The nature and processes of the chemical reactions remained unillustrated and thus, this is the key drawback of this model. Thus, option C is the correct answer.
If I start with 25.0 grams of lead (II) nitrate and 15.0 grams of sodium iodide, what is the limiting reactant?
Answer:
Pb(NO3)2- Lead NitrateNaI - Sodium IodidePb(NO3)2+2NaI−→PbI2+
2
N
a
N
O
3
Moles of Lead(II) Nitrate =
m
a
s
s
/
m
o
l
a
r
m
a
s
s
= 25.0 grams//(207.20 xx 1 + 14.01 xx 2 + 16 xx 6
= 25.0 grams//331.22
= 0.075 moles
Moles of Sodium Iodide
= 15//(22.99+126.9)
= 15//149.89
= 0.100 Moles
Limiting Reagent in this case is Lead(II) Nitrate
Ratio of Moles of Lead Nitrate to Sodium Nitrate
1:2
Ratio of "moles" of lead nitrate to Sodium Nitrate
0.075 : x1
2
=
0.075
x
x
=
2
×
0.075
x
=
0.150
Thus that means 0.150 moles of Sodium NitrateTo calculate mass of Sodium NitrateSince we know that Moles =
M
a
s
s
/
M
o
l
a
r
M
a
s
s
Thus Mass = Moles×Mola
r
MassMolar Mass of NaNO3
Na - 22.99N - 14.01O - 3(16) = 4885g/molThus, Mass = 0.150×85
Mass = 12.75
Thus, 12.75g of Sodium Nitrate can be formed
As per the balanced reaction of lead nitrate and sodium iodide, one mole of lead nitrate requires 2 moles of sodium iodide. The number of moles of sodium iodide is 0.1 moles and that of lead nitrate is 0.075. 0.075 moles requires 0.15 moles of NaI but it is deficient. Thus, NaI is the limiting reactant.
What is limiting reactant?A limiting reactant in a reaction is the one with fewer number of moles or insufficient to completely react with the reagents. Thus it determines the yield of the products.
Here the balanced equation of the reaction is:
[tex]\rm Pb (NO_{3})_{2} + 2NaI \rightarrow 2 NaNO_{3} + PbI_{2}[/tex]
Two moles of sodium iodide is required for one mole of lead nitrate.
The molar mass of NaI = 149.89 g/mol
molar mass of lead nitrate = 333.2 g/mol
Number of moles of 25 g of lead nitrate = 25 /333.2 = 0.075 moles
Number of moles of NaI in 15 g = 15 / 149.89 = 0.10 moles.
The number of moles of NaI required to react with 0.075 moles = 0.075 × 2 = 0.15 (since one mole need 2 moles of NaI)
We have only 0.1 moles of NaI. Hence NaI is the limiting reactant.
To find more on limiting reactant, refer here:
https://brainly.com/question/14225536
#SPJ2
two answer multiple choice-- please help! 18 pts!
What is true about reaction spontaneity and entropy?
The rusting of iron is a nonspontaneous process because rust particles have less entropy than iron, and reactions with a decrease in entropy are nonspontaneous.
A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Answer: A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
Spontaneous reactions are those reactions which takes place on their own and do not require any external energy source. Spontaneous reactions are always accompanied by an increse in entropy.
Thus a spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Please Help! No weird answers please!
For some traits, you will notice that there are fewer people with dominant traits than with the recessive trait. If you were a geneticist just discovering this phenomenon, what would your explanation be?
Answer:
The relationship of genotype to phenotype is rarely as simple as the dominant and recessive ... Why can you possess traits neither of your parents have? ... so concluded that there were some traits that dominated over other inherited traits. ... to notice a variety of relationships between alleles that code for the same trait.
How many Oxygen Atoms & Lithium Atoms Are in 4Li2O?
Please Help!
Answer:
8 lithium atoms and 4 oxygen atoms
which of the following best describe the main function of the cyrculatori system ?
a. to deliver nutrients an other essential material to cells an remove waste products
b. to break down the nutrients found in food so that they can be used by all cells in the humand body
c. to produce the chemical signals that allow parts of the humand body to communicated over long distances
d. to coordinate all others humand body system so that they can function together to maintain homeostaisis
Answer:
D
Explanation:
To coordinate all other human body system so that they can function together to maintain homeostasis
A student repeats a reaction several times to test the effects of various
changes on the reaction rate. The data table shows the results. Based on
these results, how would decreasing the concentration of the reactants
change the reaction rate?
Conditions
Original
Higher concentration
Higher temperature
Metal added
Reaction Time (5)
10 seconds
5 seconds
5 seconds
5 seconds
A. More information is needed to determine what would happen to
the reaction rate.
B. Decreasing the concentration would increase the reaction rate.
C. Decreasing the concentration would decrease the reaction rate.
D. Decreasing the concentration would have no effect on the
reaction rate.
Answer:
C) Decreasing the concentration would decrease the reaction rate.
Explanation:
A.P.E.X
f.
piall IL WILT
What is octet? Why is it inactive?
Answer:
Join here if u r a girl owu-bqfx-fvq
For strontium chloride, the light released when electrons transition between energy levels has a wavelength of 630 nm. Calculate:
the wavelength in meters
the frequency in Hertz
the Energy in Joules
Beryllium has an atomic number of 4 and an atomic mass of 9. How many neutrons does Beryllium have?
Answer:5
Explanation:
Match the term with its description. (4 points)
1.
Heterogeneous
2.
Colloid
3.
Homogeneous
4.
Emulsion
a.
A mixture in which microscopically insoluble particles are suspended throughout another substance
b.
A mixture in which two or more liquids are mixed that normally are not mixable
c.
Mixture that has its different components mixed unevenly within the substance
d.
Mixture that has its different components mixed evenly within the substance
Answer:
2B, 1A, 3D, 4C, because of the definitions, they match.
This is how sodium appears in the periodic table.
An orange box has N a at the center and 11 above. Below it says sodium and below that 22.99. A blue arrow points to 22.99.
The arrow is pointing to sodium’s
number of neutrons.
chemical symbol
atomic mass
combined number of electrons and protons.
Answer:
C: atomic mass
Explanation:
Answer:Atomic mass
Explanation:
How much heat will be released when 1.48 g of chlorine reacts with excess phosphorus according to the following equation?
2P + 5Cl2 → 2PCl5 ΔH = -886 kJ______kJ (Your answer should have 3 sig figs.)
Answer:
-3.70kJ
Explanation:
Notice that the problem provides you with the thermochemical equation for this reaction.
A thermochemical equation is simply a balanced chemical equation that includes the enthalpy change of reaction,
Δ
H
rxn
, for that particular reaction.
In your case, you have
2
P
(
s
)
+
5
Cl
2
(
g
)
→
2
PCl
5
(
g
)
Δ
H
rxn
=
−
886 kJ
This tells you that when the reaction produces two moles of phosphorus pentachloride,
PCl
5
, a total of
886 kJ
of heat are being given off
→
the reaction is exothermic.
Now, you need to figure out how much heat will be given off when
1.48 g
of chlorine gas reacts with excess phosphorus.
The fact that phosphorus is in excess tells you that chlorine will act as a limiting reagent, i.e. it will be completely consumed by the reaction.
Your goal now is to determine how many moles of chlorine gas you have in that sample. To do that, use its molar mass
1.48
g
⋅
1 mole Cl
2
70.906
g
=
0.02087 moles Cl
2
Use the
5
:
2
mole ratio that exists between chlorine gas and phosphorus pentachloride to determine how many moles of the latter will be produced when
0.02807
moles of chlorine take part in the reaction.
0.02807
moles Cl
2
⋅
2 moles PCl
5
5
moles Cl
2
=
0.008349 moles PCl
5
Now, you know that the reaction gives off
886 kJ
of heat when
2
moles of phosphorus pentachloride are formed. This means that when
0.008349
moles of the product are formed, the reaction will give off
0.008349
moles PCl
5
⋅
886 kJ
2
moles PCl
5
=
3.70 kJ
The answer is rounded to three sig figs.
Remember, these two statements
The reaction gives off
3.70 kJ
of heat when
0.008349
moles of product are formed
and
The enthalpy change of reaction,
Δ
H
rxn
, is equal to
−
3.70 kJ
when
0.008349
moles of product are formed
are equivalent!
Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released when 1.48 grams of chlorine reacts is 10.93 kJ.
Enthalpy of a chemical reactionThe enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
Heat released in this caseIn this case, the balanced reaction is:
2 P + 5 Cl₂ → 2 PCl₅
and the enthalpy reaction ∆H° has a value of -886 kJ/mol.
This equation indicates that when 2 moles of P reacts with 5 moles of Cl₂, 886 kJ of heat is released.
The molar mass is the amount of mass that a substance contains in one mole.
Being the molar mass of P 31 [tex]\frac{g}{mole}[/tex] and the molar mass of Cl₂ 24 [tex]\frac{g}{mole}[/tex], then when 62 grams (31 [tex]\frac{g}{mole}[/tex]× 2 moles) of P reacts with 120 grams (24 [tex]\frac{g}{mole}[/tex]× 5 moles) of Cl₂, 886 kJ of heat is released.
When 1.48 grams of chlorine are burned, then you can apply the following rule of three: if 120 grams of Cl₂ releases 886 kJ of heat, 1.48 grams of Cl₂ releases how much heat?
[tex]heat=\frac{1.48 grams x886 kJ}{120 grams}[/tex]
heat= 10.93 kJ
Finally, the quantity of heat released when 1.48 grams of chlorine reacts is 10.93 kJ.
Learn more about enthalpy of a chemical reaction:
brainly.com/question/15355361?referrer=searchResults
brainly.com/question/16982510?referrer=searchResults
brainly.com/question/13813185?referrer=searchResults
brainly.com/question/19521752
