Answer:
0.38 mol
Explanation:
Given data:
Number of formula units = 2.3×10²³
Number of moles = ?
Solution:
According to Avogadro number ,
1 mole contain 6.022×10²³ formula units.
2.3×10²³ formula units × 1 mol / 6.022×10²³ formula units
0.38 mol
Thus, 2.3×10²³ formula units of NaCl contain 0.38 moles of NaCl.
what are the 9 properties of minerals and explain each property?
Answer:
hardness-Hardness is the ability of a material to resist deformation
luster-the way light interacts with the surface of a crystal
color-the quality of an object or substance with respect to light reflected by the object
streak- the color of the powder produced when it is dragged across an un-weathered surface.
specif gravity-the density of that object divided by the density of water cleavage -the tendency of a mineral to break along smooth planes
fracture-any separation in a geologic formation
tenacity-refers to a mineral's toughness or resistance to breaking or being deformed.
lol sorry that took awhile
Question 1
What causes a thermocline?
a decline in the amount of nutrients available
a difference in water temperature
the absence of plankton
nutrients too heavy to rise to the surface
Question 2
Which organism is a kind of phytoplankton?
algae
sea butterfly
copepod
lion’s mane jellyfish
please help!! and try and answer them all, not just one!
Answer:
1) The Difference in water tempture
2) Algae
Explanation:
Have a good day! ∩__∩
Answer:
question 1. thermocline is caused by a difference in water temperature.
question 2. a kind of phytoplankton is algae
The size of atoms can be measured using the diffraction of x-rays. Measurements of atomic size confirm that trends can be identified based on location on the Periodic Table of the Elements. Which group of elements is listed in order of decreasing size?
(A.) iodine, bromine, chlorine, Zinc
(B.) boron, carbon, nitrogen, oxygen
(C.) sodium, potassium, rubidium, cesium
(D.) phosphorous, selenium, iodine, radon
Answer:B is the answer I thinn
Explanation:I think !!
Examine the Lewis structure.
H—H-O:
What is incorrect in the structure? Check all that
apply.
The middle hydrogen is surrounded by 4
electrons.
Oxygen is surrounded by 8 electrons.
The middle hydrogen is bonded to 2
elements.
There are too many electrons in the final
structure.
Answer:
The middle hydrogen is bonded to 2
elements.
Each hydrogen must be bonded to one element which is oxygen
Answer:
A, C, and D
Explanation:
what is elastic force
Answer:
Something that is elastic can return to its original shape after being stretched or compressed. As you stretch or compress an elastic material like a bungee cord or a rubber band it resists the change in shape. It exerts a counterforce in the opposite direction. Now if you pull back the rubber band u are using force now if you let go the force that you used to pull back is transferred into the band snapping and bouncing. This force is called an elastic force.
Answer:
it is something that will return back to shape and being stretched or compressed
What is the mass (in g) of 5.43 moles of calcium sulfate
Answer:
479 grams
Explanation:
5.43 times the molar mass of CaSO4 would give us the answer.
(5.43) * (40.078 + 32.066 + 15.9994) = 478.618662 grams
Significant figures is 3, meaning we need to round it into 3 places, giving us 479 grams.
The halogens are the elements of group 17 on the periodic table. Halogens combine easily with elements from group 1. When a halogen reacts with a metal, what type of compound is formed?
A.
potassium
B.
salt
C.
noble gas
D.
alloy
Answer:
it was salt just took it
Explanation:
Halogens are non metals and when a non metals reacts with metals they form an ionic compound by gaining electrons from the metal.
What are ionic compounds?Ionic compounds are formed by electron loss/gain between two atoms. Ionic bond is the strongest type of bond. Ionic bond is formed between metals and nonmetals.
Metals are electron rich and they are electropositive in nature. They lose one more electron when reacted with nonmetals. Nonmetals which are electronegative will gain electron from the metals and form the ionic bond.
Halogens such chlorine, bromine etc are highly electronegative and they form ionic compounds of metals such as sodium, potassium, magnesium etc by losing gaining one electron from the metal. Therefore, when halogens reacts with metals forming ionic compounds.
To refer more on ionic compounds, refer here:
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Please help me A 0.200 M NaOH solution was used to titrate a 18.25 mL HE
solution. The endpoint was reached after 31.20 mL of titrant
were added. Find the molar concentration of the original HF
solution.
The molar concentration of the original HF solution : 0.342 M
Further explanationGiven
31.2 ml of 0.200 M NaOH
18.2 ml of HF
Required
The molar concentration of HF
Solution
titration formula
M₁V₁n₁=M₂V₂n₂
n=acid/base valence (amount of H⁺/OH⁻, for NaOH and HF n =1)
Input the value :
[tex]\tt 0.2\times 31.2=M_2\times 18.25\\\\M_2=0.342[/tex]
One of the signs of a chemical reaction taking place is:
Answer:
Precipitates indication release of gas
Or just vapor-again indictaing release of gas
Change in melting/boiling point, change in pH
Change in temperature
Answer:
formation of precipitatechange in statechange in colourevolution of a gas change in temperatureExplanation:
these signs show that the chemical reaction has taken place.
Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?
Krypton is a halogen, so it is a secret element because it is always part of a compound and is difficult to find by itself.
Krypton is a halogen, so it should be kept secret because it is so reactive and toxic.
Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
Krypton is a noble gas, so it secretly bonds with every type of element without showing it
Answer:
C) Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
Explanation:
Answer:
C
Explanation:
In the laboratory, Austin is given a mixture of iron filings, sand, and salt. To separate the mixture, Austin uses a magnet, boiling water, and a
filter. Which statement is true about the process Austin uses to separate this mixture?
A. Austin uses only physical changes to separate the
mixture's components.
B. Austin uses only chemical changes to separate the mixture's components.
C. Austin uses both physical and chemical changes to separate the mixture's components.
D. Austin uses neither physical nor chemical changes to separate the mixture's components.
Answer:
d
Explanation:
The statement that is true about the process Austin uses to separate this mixture is that Austin uses neither physical nor chemical changes to separate the mixture's components. The correct option is D.
What is a laboratory?A laboratory is a place with carefully regulated circumstances where experiments, measurements, and scientific or technological research can be done.
Here, Austin is separating a mixture in the laboratory. Now, iron is attracted to the magnet, and sand and salt are not attracted to the magnet. So these will be separated by the magnetic property of the iron. It is a physical property of a substance that matters in this separation.
Thus, the correct option is D. Austin uses neither physical nor chemical changes to separate the mixture's components.
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my mom is yelling at me Bc of all my missing assignments Ik that’s a me problem but pls help me
Pls
How might a chef use chemistry?
A. Chemistry can help a chef understand how to combine different
ingredients in a recipe.
B. Chemistry can help a chef understand how to present food
artistically
C. Chemistry can help a chef understand how heat is transferred in
ovens.
D. Chemistry can help a chef understand which recipes are healthy
Answer:
A. Chemistry can help a chef understand how to combine different ingredients in a recipe.
Explanation:
Knowing the chemical reactions between ingredients used in cooking helps chefs understand how well different ingredients would react to eachother.
*Im pretty sure this is correct.
A young deer needs cell division to grow to its full size. However, a deer's cells continue to divide through its whole life. Why do an adult deer's cells
continue to divide? Choose the two statements that apply.
A Cell division prevents cancer.
B. Cell division improves the deer's memory.
C. Cell division repairs damage from injuries.
D
Cell division replaces old or diseased cells
U
E Cell division helps the deer eliminate wastes.
Answer:
D :)
Explanation:
Cells die and the new cells that are being produced are replaced by new living cells. (If cell division prevented cancer, we'd all be saved by now.)
Cell division is carried to produce new identical cells to during reproduction as well to replace old and diseased cells. Thus option C is correct.
What is cell division.Cell division is the process of multiplication of a cell into two identical daughter cells. Cell division is taking place in all living organism by which they reproduce and repair cells.
Cell division takes places through several stages namely, interphase, telophase etc. There are different methods of cell division such as mitosis, meiosis, binary fission etc.
Different level of organisms follows different methods for cell division. In eukaryotes, mitosis takes place where genetically identical daughter cells are produced. It is called vegetative division.
In reproductive cell division the number of chromosomes will be reduced in daughter cell to half or that in parent cells. Thus in a cell cycle , the odl cells are replaced by new cells and identical offsprings are created by cell division. Hence, option C is correct.
To find more about cell division, refer the link below:
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What did most of the particles that Rutherford shot at the gold foil do? What was the surprising behavior of a few of the particles? What did he determine?
Answer:
Explanation:
Rutherford gold experiment gave the explanation to some observations made on atoms.
When he shot the gold foil, most of the [tex]\alpha[/tex]-particles passes through the foil undeflected nor absorbed. This faction of the particles propagated the foil as if there was nothing placed on their path.
The surprising behavior of a few of the [tex]\alpha[/tex]-particles was that they were deflected from their initial path on hitting the gold foil.
This implies that there is a part of the gold foil which has the same charge as the [tex]\alpha[/tex]-particles, and more massive than the particles. Thus, he was able to determine the nucleus of an atom.
2. A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called
O A. ionic formula
O B. empirical formula
O C. molecular formula
When 60.0 g methane (CH4) is placed in a 1.00-L vessel, the pressure is measured to be 130 atm. Calculate the temperature of the gas using (a) the ideal gas law and (b) the van der Waals equation. Do attractive or repulsive forces dominate
Answer:
(a) By the ideal gas law, the temperature of the gas is approximately 423.51129 K
(b) By the Van der Waals equation, the temperature of the gas is approximately 442.00558 K
Explanation:
The given parameters are;
The mass of the methane gas, m = 60 g
The volume of the container in which the gas is placed, V = 1.00-L
The pressure of the gas in the container, P = 130 atm
The molar mass of methane, CH₄ = 16.04 g/mol
The Van der Waals Constant for Methane (CH₄) a = 2.253 atm L²·mole⁻² and b = 0.04278 L·mol⁻¹
The universal gas constant, R = 0.08206 L·atm·mol⁻¹·K⁻¹
The number of moles of methane present, n = 60.0 g/(16.04 g/mol) ≈ 3.7406 48 moles
(a) The ideal gas law is P·V = n·R·T
Where;
P = The pressure of the gas
V = The volume of the gas
R = The universal gas constant
T = The temperature of the gas
n = The number of moles of the gas
Therefore, T = P·V/n·R
By substituting the known values of the variables, we get;
T = 130×1/(3.740648 × 0.08206) ≈ 423.51129 K
The temperature of the gas, T ≈ 423.51129 K
(b) The Van der Waals equation of state;
[tex]n \cdot R \cdot T = \left (P + a \cdot \dfrac{n^2}{V^2} \right) \cdot (V - n\cdot b)[/tex]
Therefore, we have;
[tex]T = \dfrac{ \left (P + a \cdot \dfrac{n^2}{V^2} \right) \cdot (V - n\cdot b)}{n \cdot R}[/tex]
Therefore, we have;
[tex]T = \dfrac{ \left (130 + 2.253 \times \dfrac{3.740648^2}{1^2} \right) \times (1 - 3.740648\cdot 0.04278)}{3.740648 \times 0.08206} = 442.00558 \ K[/tex]
The temperature of the gas, T ≈ 442.00558 K.
The chemical equation below represents the formation of ammonia.
N2 + 3 H2 --> 2 NH3
How many grams of ammonia are produced when 1.0 mole of nitrogen reacts?
Answer:
Mass of ammonia produced= 34 g
Explanation:
Given data:
Mass of ammonia produced = ?
Number of moles of nitrogen = 1.0 mol
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles of ammonia and nitrogen.
N₂ : NH₃
1 : 2
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 2 mol × 17 g/mol
Mass = 34 g
How many moles of magnesium nitrate are produced from 143.2 grams of nitric acid, HNO3?
2HNO3 + Mg(OH)2 = Mg(NO3)2 + 2H2O
Answer:
1.14 mol
Explanation:
Given data:
Mass of HNO₃ react = 143.2 g
Moles of Mg(NO₃)₂ produced = ?
Solution:
Chemical equation:
2HNO₃ + Mg(OH)₂ → Mg(NO₃)₂ + 2H₂O
Number of moles of HNO₃:
Number of moles = mass/molar mass
Number of moles = 143.2 g/ 63.01 g/mol
Number of moles = 2.273 mol
Now we will compare the moles of HNO₃ and Mg(NO₃)₂
HNO₃ : Mg(NO₃)₂
2 : 1
2.273 : 1/2×2.273 = 1.14 mol
2.
Use electron configurations to explain the bonding between lithium and chlorine. Be sure to
include the formula for lithium chloride.
Explanation:
Electronic Configuration for Li: 1s²2s¹
Electronic Configuration for Cl: [Ne]3s²3p⁵
When Lithium and Chlorine bonds together, the electron in the Lithium 2s subshell will be transfered to the Chlorine 3p subshell, giving both the Lithium and Chlorine atoms a complete 1st and 3rd energy levels respectively.
Formula for Lithium chloride: LiCl.
"The incredible diversity of pterosaurs is perhaps best expressed in one of the
prehistoric flying reptile's most intriguing and mysterious features: the head crest."
What evidence from the text supports the idea that the diversity of pterosaurs is best
expressed in their head crests?
A "Many pterosaurs had flesh-and-bone crests atop their skulls - dramatic
anatomical characteristics whose purpose is still debated by paleontologists."
B "Akin to a rooster's comb, peacock's crown, or the frill on some lizards!
necks, pterosaur crests were prominent anatomical features found across many
species."
C "Pterosaurs crests are thought to have been fairly ubiquitous, appearing in
many groups of pterosaurs from the Triassic (252-201 million years ago)
through the Jurassic (201–145 million years ago) and Cretaceous (145-66
million years ago) periods."
D "Among pterosaur species known to have had crests, there is an amazing
range of shapes and sizes."
Answer:
b
Explanation:
If 5.4 moles of Fe react with 4.7 moles of O2, what is the maximum amount of Fe2O3 (in moles) that can be produced? What is the limiting reactant?
a
3.1 moles of Fe2O3 is the maximum amount that can be produced. Oxygen is the limiting reactant.
b
2.7 moles of Fe2O3 is the maximum amount that can be produced. Iron is the limiting reactant.
c
7.1 moles of Fe2O3 is the maximum amount that can be produced. Oxygen is the limiting reactant.
d
10.8 moles of Fe2O3 is the maximum amount that can be produced. Iron is the limiting reactant.
Answer:
2.7 moles of Fe₂O₃ is the maximum amount that can be produced. Iron is the limiting reactant.
Explanation:
The balanced reaction is:
4 Fe + 3 O₂ → 2 Fe₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
Fe: 4 molesO₂: 3 molesFe₂O3: 2 molesThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
You can use a simple rule of three as follows: if by stoichiometry 4 moles of Fe reacts with 3 moles of O₂, how much moles of Fe will be needed if 4.7 moles of O₂ react?
[tex]moles of Fe =\frac{4. moles of Fe*4.7 moles of O_{2}}{3 moles of O_{2} }[/tex]
moles of O₂= 6.27
But 6.27 moles of Fe are not available, 5.4 moles are available. Since you have less moles than you need to react with 4.7 moles of O₂, iron Fe will be the limiting reagent.
So you can use a simple rule of three as follows: if by stoichiometry 4 moles of Fe produce 2 moles of Fe₂O₃, how many moles of Fe₂O₃ will be produced if 5.4 moles of Fe react?
[tex]moles of Fe_{2}O_{3}=\frac{5.4 moles of Fe*2 moles of Fe_{2} O_{3} }{4 moles of Fe}[/tex]
moles of Fe₂O₃= 2.7 moles
Then:
2.7 moles of Fe₂O₃ is the maximum amount that can be produced. Iron is the limiting reactant.
1) What are renewable energy sources?
Resources that will never run out.
W
Resources that will run out eventually.
They are new resources we have never used before.
O What is a resource?
What is the mass of 1.45 moles of silver sulfate?
Answer:
449.5 g
Explanation:
Silver sulfate- Ag2SO4
M(Ag)=107 g/mol => M(Ag2)=214 g/mol
M(S)=32 g/mol
M(O)=16 g/mol => M(O4)=64 g/mol
M(Ag2SO4)=310 g/mol
n=1.45 mol
m(Ag2SO4)=M(Ag2SO4)*n=310 g/mol *1.45 mol= 449.5 g
What is the gram atomic mass of lithium?
Answer:
It is 7 g in accordance to the periodic table
If there are only two atoms in a molecule, what would make it nonpolar?
Answer:
In general, if the electronegativity difference between two atoms is less than 0.5, the bond is considered nonpolar, even though the only truly nonpolar molecules are those formed with identical atoms. Nonpolar molecules also form when atoms sharing a polar bond arrange such that the electric charges cancel each other out.
Explanation:
sorry if I'm wrong or if this doesn't help you
Which statements describe the Rutherford atomic model? Check all that apply.
It defined the nucleus for the first time.
Electrons exist only in energy levels.
Electrons orbit the nucleus.
Electrons exist in any location in the atom.
Answer:
1 and 4
Explanation:
Answer:
1 and 4 is correct
Explanation:
(;
calculate the mass of a sample of cobalt containing 3.31x10^22 atoms
Answer:
Mass = 3.24 g
Explanation:
Given data:
Number of atoms of cobalt = 3.31 × 10²² atoms
Mass of cobalt atoms = ?
Solution:
We will calculate the number of moles of cobalt by using Avogadro number.
1 mole contain 6.022× 10²³ atoms
3.31 × 10²² atoms × 1 mol / 6.022× 10²³ atoms
0.549 mol × 10⁻¹
0.0549 mol
Mass of cobalt:
Mass = number of moles × molar mass
Mass = 0.0549 mol × 58.93 g/mol
Mass = 3.24 g
pls help me balance this equation
C8 H18 + O2 CO2 + H2O
Answer:
2C8H18 + 25O2 → 16CO2 + 18H2O
Explanation:
Analyze the energy associated with a phase change and provide an example of how energy is conserved.
1:The energy involved in a phase change depends on two major factors: the number and strength of bonds or force pairs. The number of bonds is proportional to the number of molecules and thus to the mass of the sample. The strength of forces depends on the type of molecules. The heat Q required to change the phase of a sample of mass m is given by
2:According to the law of conservation of energy, energy can neither be created nor destroyed but can be transformed from one form to another. Conversion of electric energy into sound energy is an example of the conservation of energy.
Explanation:
Hope it helps UvU
