Answer:
[tex]\boxed {\boxed {\sf 0.068 \ mol \ NaCl}}[/tex]
Explanation:
To convert from molecules to moles, Avogadro's Number must be used. This number is 6.022 *10²³. It tells us the number of particles (atoms, molecules, etc.) in 1 mole of a substance.
In this case, the particles are molecules of sodium chloride. We can make a ratio.
[tex]\frac {6.022*10^{23} \ molecules \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Multiply by the given number of molecules.
[tex]4.1*10^{22} \ molecules \ NaCl *\frac {6.022*10^{23} \ molecules \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Flip the fraction so the moles of sodium chloride cancel.
[tex]4.1*10^{22} \ molecules \ NaCl *\frac {1 \ mol \ NaCl}{6.022*10^{23} \ molecules \ NaCl }[/tex]
[tex]4.1*10^{22} *\frac {1 \ mol \ NaCl}{6.022*10^{23} }[/tex]
[tex]\frac {4.1*10^{22} \ mol \ NaCl}{6.022*10^{23} }[/tex]
[tex]0.06808369313 \ mol \ NaCl[/tex]
The original measurement of molecules has 2 significant figures, so our answer must have the same. For the number we calculated that is the thousandth place.
The 0 in the ten thousandth place tells us to leave the 8.
[tex]0.068 \ mol \ NaCl[/tex]
There are 0.068 moles of sodium chloride.
How many valence electrons are in an atom of Zinc (III)
Atomic number 30
Atomic mass 65.38
a 12
b 35
c 3
d 30
Answer:
A.) 12
Explanation:
The number of valence electrons= the group number
Answer:
c) 3 valence elcertons
How many moles are in 435 grams of sulfur, S?
Answer:
32.065 is the correct answer.
Which of these have a double bond? Pick all that apply:
SiCL2Br2
H2O
HBr
SeBr2
CO2
Answer: Here goes ur answer
CO2
Explanation:
A 40 g gold coin is heated from 10°C to 50°C (CAuis 0.13 J/g−°C). What is the △H?
The answer would be +208 J.
state the kinetic theory of matter
Answer:
The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.
A car is driving directly south down a road. It slows down to
stops at a few stop signs, and then, accelerates up to 30 miles
per hour.
Is the car's velocity changing? Why or why not?
which alkaline earth metal is the components of quick lime
Answer:
Calcium
Explanation:
is a silver-gray metal which takes its name from the Latin word calx, which means lime. It is the fifth most abundant element in the earth's crust and is widely distributed as limestone (CaCO3), quicklime (CaO) and calcium fluoride.
Alkaline earth metals are present on the left of the periodic table. Therefore, calcium is the alkaline earth metal is the components of quick lime.
What is metal ?Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.
The properties of metals are:
1.Since metals have free electrons that's why they can conduct electricity
2. Since atoms in metals are very closely packed in a definite crystal so these are solid. It is not brittle that is it can not be broken down easily
3. It does not react with water easily.
4.It is denser than water hence it sink in water.
The formula for quick lime is quicklime (CaO). The alkaline earth metal that is component of quick lime is calcium Ca. Quick lime is used in white washing.
Therefore, calcium is the alkaline earth metal is the components of quick lime.
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What is the volume of a container containing 7.59 moles of krypton gas at STP?
170.034 L is the volume of a container containing 7.59 moles of krypton gas at STP.
What is an ideal gas equation?
The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.
Using the ideal gas equation
PV =nRT
Where P is the pressure
V is the volume
n is the number of moles
R is the ideal gas constant (R = 0.08206 L atm mol⁻¹ K⁻¹)
T is the temperature.
From the given information
V =?
n = 7.59
and at STP
P = 1 atm
T = 273 K
Putting the parameters into the formula, we get
PV =nRT
1 atm x V = 7.59 mol x 0.08206 L atm mol⁻¹ K⁻¹ x 273 K
V = 170.034 L
Hence, 170.034 L is the volume of a container containing 7.59 moles of krypton gas at STP.
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What is Haber's process? Write it with chemical reaction.
Answer: Habers process is the industrial process used for the production of ammonia
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
Explanation:
Habers process is the industrial process used for the production of ammonia. It uses hydrogen from natural gas and nitrogen mainly from atmosphere under extremely high pressures (150-200atm) and moderately high temperatures [tex](400-450^0C)[/tex].
The catalyst used in Habers process is iron.
The balanced chemical reaction is:
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
an object that is moving will stop when
Answer:
factor
Explanation:
Answer:
something pushes or pulls it to a stop.
formula of barium hydroxide and potassium superoxide
Answer:
Barium hydroxide Ba(OH)2
Potassium superoxide KO2
35. 124.31 g of silver nitrate reacts with 52.89 g of sodium chloride.
g
a. What is the mass of the products?
Answer: Thus mass of products is 177.2 g
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical reaction is:
[tex]AgNO_3+NaCl\rightarrow NaNO_3+AgCl[/tex]
mass of silver nitrate [tex](AgNO_3)[/tex] = 124.31 g
mass of sodium chloride [tex](NaCl)[/tex] = 52.89 g
mass of reactants = mass of silver nitrate [tex](AgNO_3)[/tex] +
mass of sodium chloride [tex](NaCl)[/tex] = 124.31 g + 52.89 g = 177.2 g
Thus mass of products = mass of reactants = 177.2 g
when combined the two substances together in the cup, the product can be described as a ____ or ____ (there are two possible answers . you just need to choose one )
1. white gas
2. white liquid
3. white solid
Which of these is NOT found in the earths crust?
Oxygen
Iron
Sulphur
Helium
Explanation:
helium
Helium gas is not found in earth crust
which alkaline earth metal is the components of slaked lime
Answer:
calcium hydroxide.............
The Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.
What is the Alkaline Earth metal?The alkaline earth metals are those elements that correspond to group 2 in the modern periodic table which includes beryllium, magnesium, calcium, strontium, barium, and radium. The elements in this group are quite similar in their physical and chemical properties.
For above information, Calcium is the [tex]20^t^h[/tex]element and Magnesium is the [tex]12^t^h[/tex] element in the periodic table.
Chemically, the given materials which are mentioned above is represented in following manner.
Limestone is Calcium Carbonate -[tex]CaCO_3[/tex]
Slaked Lime is Calcium Hydroxide - [tex]Ca(OH)_2[/tex]
Quicklime is Calcium Oxide - CaO
Gypsum is Calcium Sulfate Dihydrate - [tex]CaSO_4.2H_2O[/tex]
Epsom salt is Magnesium Sulfate - [tex]MgSO_4[/tex]
Limestone decomposes into slaked lime on heating, and slaked lime is formed on hydration of slaked lime.Gypsum is an important component in the manufacture of cement. The hydrate of gypsum is known as Plaster of Paris.Epsom salt has some uses in plants.Thus, the Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.
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The above question is incomplete. Completed question is Which alkaline earth metal is the components of the following. Materials lime stone , slaked lime , quick lime , gypsum , Epsom salt.
Metion two common types of flames and conditions under which each is produced
Answer:
natural flame,oxidising flame
What is the key difference between a liquid and a gas?
A. average kinetic energy
B. intermolecular attractions
C. the ability to flow
B. intermolecular attractions.
What are the two types of microscopes?
+
Answer:
1) The light microscope. The common light microscope used in the laboratory is called a compound microscope because it contains two types of lenses that function to magnify an object. The lens closest to the eye is called the ocular, while the lens closest to the object is called the objective. Most microscopes have on their base an apparatus called a condenser, which condenses light rays to a strong beam.
2) Other light microscopes. In addition to the familiar compound microscope, microbiologists use other types of microscopes for specific purposes. These microscopes permit viewing of objects not otherwise seen with the light microscope.
3) The fluorescent microscope uses ultraviolet light as its light source. When ultraviolet light hits an object, it excites the electrons of the object, and they give off light in various shades of color. Since ultraviolet light is used, the resolution of the object increases. A laboratory technique called the fluorescent‐antibody technique employs fluorescent dyes and antibodies to help identify unknown bacteria.
The surface currents of Earth’s oceans are most likely created by which of the following?
Answer:
global wind patterns. the rotation of the Earth. the shape of the ocean basins.
Explanation:
different states of matter and characteristics of each state
Explanation:
[tex] \boxed{ \text{States \: of \: matter}}[/tex]
Matter exists in three physical states. They are :
SolidLiquid Gas✰ [tex] \underline{ \text{Characteristics \: of \: solid}} : [/tex]
They have fixed shape.They have fixed volume.They do not flow.They cannot be compressed , because their molecules are closely packed.They are mostly hard.[ Stones , bricks etc are some of the examples of solid ].
✰ [tex] \underline{ \text{Characteristics \: of \: liquid}} : [/tex]
They don't have a fixed shape but can take the shape of their container.They cannot be compressed.They flow from one place to another as their molecular are loosely packed.They have fixed volume.[ Water , Ink , Milk , Cooking oil , petrol etc are some of the examples of Liquid ] .
✰ [tex] \underline{ \text{Characteristics \: of \: gas}} : [/tex]
They don't have fixed volume.They can flow very easily.They can be compressed easily.They do not have fixed shape as the position of their molecules are not fixed.[ Air , oxygen , carbon dioxide etc are some of the examples of gas ] .
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a. How does the atomic radius change going down and across the periodic table?
B. How does first ionization energy change going down and across the periodic table?
Answer: A when going down the periodic table your atomic radius will get bigger same if you got to the side. B Moving left to right within a period or upward within a group, the first ionization energy generally increases
Explanation:
How many times as bright as a light that is 90 m away from you does a light that is 10 m away from you appear?
Answer:
81 x as bright
Explanation:
The intensity of light is dependent on distance according to this simple equation:
(90/10)^2 = 9^2
= 81
This was derived from the inverse-square law. Respectively a light that is 10 m away from you is 81 x as bright.
3. A 500Kg block of aluminium has a volume of 0.185m3. Calculate it's density.
Answer:
Density = mass/volume
Density = 500 kg/0.185m3
Density = 2702.7 kg/m^3
Hope this helps!
Answer:
2702.7 kg/m3
Explanation:
d= 500kg / 0.185m3
d=2702.7 kg/m3
why is carbon classified as an element
Answer:
D: It combines with oxygen to form a gas.
Explanation:
Carbon is classified as an element because of its ability to combine with other elements and form a new substance or compound.
Looking at the options, the correct option in the light is option D
How many atoms are in a single molecule of FeCl2
the scientist who discovered carbon dioxide gas
Answer:
Joseph Black discovered carbon dioxide.
Explanation:
Describe the effects of anaerobic respiration on the body and explain the effects on the body
Answer:
In anaerobic respiration, glucose breaks down without oxygen. The chemical reaction transfers energy from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Unfortunately this can lead to painful muscle cramps.
please mark my anSwEr as brainlist
Answer:
In anaerobic respiration, glucose breaks down without oxygen. The chemical reaction transfers energy from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Unfortunately this can lead to painful muscle cramps.
Explanation: Living things need energy for everything they do, including growing and reproducing. This energy comes from glucose. All animals and humans get glucose through eating it, but plants need to make their own glucose during photosynthesis.
Plants and animals transport glucose and oxygen to tiny structures in their cells, called mitochondria. Here, the glucose and oxygen take part in a chemical reaction. The reaction is called aerobic respiration, and it produces energy which transfers to the cells.
Aerobic respiration makes two waste products:carbon dioxide and water. Animals remove carbon dioxide from their bodies when they breathe out. In daytime, plants use some of this carbon dioxide for photosynthesis. At night, they release the carbon dioxide to their surroundings.
10. Un volumen de 1.0 mL de agua de mar contiene casi 4.0 3 10212 g de Au. El volumen total de agua en los océanos es de 1.5 X 1021 L. Calcule la cantidad total de Au (en gramos) existente en el agua de mar y su valor total en dólares (Suponga que el oro tiene un precio de 948 dólares por onza)
Answer:
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Explanation:
What type of chemical reaction is given by the following balanced equation:
Al₂O3 → AL+ O₂
Answer:
Decomposition
Explanation:
PLESE HELP! Which of the following sugar solutions is the most concentrated?
Select one:
a. 25 g of sugar in 60 mL of water
b. 2 g of sugar in 100 mL of water
c. 15 g of sugar in 25 mL of water
d. 12 g of sugar in 30 mL of water
c.15gof in25mlof wather
The sugar solution that is the most concentrated is 15 g of sugar in 25 mL of water.
CONCENTRATION:
The concentration of a solution is related to the amount of a substance and its volume. The concentration of a solution is directly proportional to the amount of a substance but inversely proportional to the volume. This means that the concentration increases with an increasing amount of substance but decreases with an increasing volume. According to this question, 15g of sugar is the highest amount and it dissolves in 25mL of water, which is the lowest volume. Therefore, it is the most concentrated sugar solution.Learn more at: https://brainly.com/question/202460?referrer=searchResults