Explanation:
the average atomic mass of chlorine= (34.968 x 0.7553) + ( 36.956 x 0.2447) = 35.4545
Ca % = 100x (5 x 40/502 ) = 39.84 % ( where 502 is molar mass of comp)
P% = 3 x 30.97367 x 100/502 = 18.51 %
O % = (100x13x16)/502 = 41.434
H % = 100-39.84-18.51-41.434 = 0.216 %
% Ca = 100 x40/( 116) = 34.483 %
% Si = 100 x28/116 = 24.14 %
% O = 100-34.483-24.14 = 41.38 %
Balance the following chemical equation: CH4+ Cl2 → CCl4+ HCI
Explanation:
CH4+8/2Cl2—>CCl4+4HCl
that is,1molecule of methane+8/2 molecules of dichlorine—>1molecule of carbon tetrachloride+4molecules of hydrogen chloride
whats the Number of molecules in 1.500 mole of H2O
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 9.033×10²³ is the number of molecules in 1.500 mole of H[tex]_2[/tex]O.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)
number of moles =1.500 mole
substituting all the given values in the above equation, we get
number of atoms/molecules=1.500 × 6.022×10²³(Avogadro number)
number of atoms/molecules =9.033×10²³molecules
Therefore, 9.033×10²³ is the number of molecules in 1.500 mole of H[tex]_2[/tex]O.
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What is the direct democracy? Does it work well with a large or small population
Answer:
In a direct democracy, which is also called pure democracy the decisions are not taken by representatives. All decisions are voted on by the people. When a budget or law needs to be passed, then the idea goes to the people. Large governments rarely make decisions this way
Explanation:
I don't think direct democracy works well unless the population is homogenous and agree on major issues
How would a long period without sunlight affect the food web?
It would cause consumers to consume more food.
It would have no effect on the food web.
It would stop decomposers from breaking down matter.
It would stop producers from producing food.
Answer: it would stop producers from producing food.
Explanation: why? Without the action of the producers to turn sunlight into food, the producers would die, and consumers that rely on them would lose their food source and die too.
Answer:
It would stop producers from producing food
Explanation:
Producers would die, and if producers died, consumers would die too.
Hope this helps
What is the mass of 1.84 mol NaCl? Give your
answer to the correct number of significant
figures. (Molar mass of NaCl = 58.44 g/mol)
1.84 mol NaCl =
Answer:
108 g
Explanation:
Answer:
answer in picture
Explanation:
c5h12 compound name
What do you think the saying ‘think globally, act locally’ means? How does this apply to the issue of plastic debris in the ocean?
30 POINTS HELP Which idea was supported by Aristarchus, Copernicus, and Galileo?
The planets have epicycles.
The planets revolve around the Sun.
The stars rotate around the Sun.
The center of the solar system is Earth.
Answer:
SO SORRY it took so long but the answer is B :)
Explanation:
Trust me and good luck :)
The theory that the planets move around the sun was endorsed by Aristarchus, Copernicus, as well as Galileo. The solar system revolves around the sun.
What is Aristarchus?Aristarchus of Samos was just a Greek astronomer that suggested the very first heliocentric model of the cosmos, wherein the sun, rather than the earth, was even at its center. Despite the fact that his hypothesis was acknowledged by other philosophers of the time, it was dismissed as unrealistic, and the geocentric model remained in use for the next 1,700 years.
What is Copernicus?Copernicus was also the first to assert that the Earth as well as the other planets orbit the sun. It was really a significant shift in thinking.
What is sun?Sun can be considered as a star in solar system.
The theory that the planets move around the sun was endorsed by Aristarchus, Copernicus, as well as Galileo. The solar system revolves around the sun.
Therefore, the correct answer will be option (b).
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A Gold ring is a what?
Element
Compound
Colloid
Alloy
Answer: Alloy
Explanation: gold is an alloy, or mixture of metals
How many moles are 3.21×10^28 molecules of N2?
Answer:5 to the 7th power
Explanation:
Divided 7 and y then add 4
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 5.33×10²⁴moles are in 3.21×10²⁸ molecules of Nitrogen.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample.
Given number of molecules of nitrogen=3.21×10²⁸ atoms
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole of nitrogen=given number of atoms ÷ 6.022×10²³(Avogadro number)
Substituting the values
moles of nitrogen=3.21×10²⁸ ÷ 6.022×10²³
mole of nitrogen= 5.33×10²⁴moles
Therefore, 5.33×10²⁴moles are in 3.21×10²⁸ molecules of Nitrogen.
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Is burning physical or chemical change?
Answer:
a chemical change
Explanation:
lighting a match is a chemical change. chemical reactions cause chemical change. in a chemical reaction two or more substances, called the reactants, form different substances called products. hope this helped :)
50g nitrous oxide combines with 50g oxygen form dinitrogen tetroxide according to the balanced equation below.
2N20 + 302 - 2N204
Limiting reactant : O₂
Mass of N₂O₄ produced = 95.83 g
Further explanationGiven
50g nitrous oxide
50g oxygen
Reaction
2N20 + 302 - 2N204
Required
Limiting reactant
mass of N204 produced
Solution
mol N₂O :
[tex]\tt =\dfrac{50}{44}=1.136[/tex]
mol O₂ :
[tex]\tt =\dfrac{50}{32}=1.5625[/tex]
2N₂O+3O₂⇒ 2N₂O₄
ICE method
1.136 1.5625
1.0416 1.5625 1.0416
0.0944 0 1.0416
Limiting reactant : Oxygen-O₂
Mass N₂O₄(MW=92 g/mol) :
[tex]\tt =mol\times MW=1.0416\times 92=95.83~g[/tex]
What is the molar mass of magnesium sulfate, MgSO4?
Answer:
120.37 g/mol is the molar mass of magnesium sulfate
Phosgene is a highly toxic gas made up of carbon, oxygen, and chlorine atoms. Its density at 1.05 atm and 258C is 4.24 g/L. (a) What is the molar mass of phosgene
Answer:
Molar mass = 99 g/mol
Explanation:
Phosgene contains carbon, oxygen and chlorine atoms. Its molecular formular is; COCl2
The molar mass is given as the sum off the individual atomic mass of the elements in the compound.
Molar mass = C + O + 2Cl
Molar mass = 12 + 16 + 2(35.5)
Molar mass = 99 g/mol
62.4 mL of an HNO3 solution were
titrated with 56.25 mL of a 0.235 M
KOH solution to reach the
equivalence point. What is the
molarity of the HNO3 solution?
The molarity of the HNO₃ solution : 0.212 M
Further explanationGiven
62.4 mL HNO₃
56.25 mL of a 0.235 M KOH
Required
Molarity HNO₃
Solution
Titration formula
M₁V₁n₁=M₂V₂n₂
1= HNO₃, 2 = KOH
n = acid base valence (amount of H⁺/OH⁻ released,for HNO₃ and KOH = 1)
Input the value :
M₁ x 62.4 x 1 = 0.235 x 56.25 x 1
[tex]\tt M_1=\dfrac{0.235\times 56.25\times 1}{62.4\times 1}\\\\M_1=0.212[/tex]
Answer:
0.212
Explanation:
Give an example of chemical reaction that occurs in everyday life
Answer: metal and salt water
Explanation: salt starts to brake down metal and metal is everywhere in the ocean hope this helps
Answer:
baking a cake.
Explanation:
baking a cake is an example of a chemical reaction that happens daily because a new substance is forming when the cake is being baked. hope this helps! :)
The IUPAC name of(CH3)2CHCH2CH=CH2
Answer:
4-Methyl-1-pentene
Explanation:
According to the International Union of Pure and Applied Chemistry (IUPAC), IUPAC nomenclature of organic chemistry is defined as the system of naming organic chemical compounds.
There are certain rules for naming organic chemical compounds as per IUPAC. The name of given (CH3)2CHCH2CH=CH2 will be based on the same rules.
At first find out the longest continuous chain and number the chain consecutively (preference given to double and single bonds), so numbering will start from right to left. the given chemical is 5 Carbon chain long.Then, identify the groups attached to this chain. Methyl is the only group attached to this chain at 4 Carbon.Assemble the name in alphabetical order using the full name using correct prefix and suffix.4-Methyl-1-pentene is the name of this chemical, as methyl is in 4th carbon position, Pent for 5 carbon chain and -ene (suffix) for one double bond).
Hence, the correct answer is "4-Methyl-1-pentene".
Write a balanced chemical equation depicting the formation of one mole of H2O2(g) from its elements in their standard states.
Answer:
[tex]H_2(g)+O_2(g)\rightarrow H_2O_2(g)[/tex]
Explanation:
Hello!
In this case, since the formation reaction of a compound is undergone when the pure elements composing it are combined, for gaseous hydrogen peroxide, gaseous diatomic hydrogen and oxygen (standard state) must be combined in order to obtain the gaseous hydrogen peroxide as shown below:
[tex]H_2(g)+O_2(g)\rightarrow H_2O_2(g)[/tex]
Whereas it is proved there are two hydrogen and oxygen atoms at each side of the chemical equation and therefore it is balanced.
Best regards!
Which of the following are examples of chemical energy being released or stored?
I. A car battery reacting and releasing energy
II. A girl eating a sandwich which helps her move
III. Propane burning on a barbecue
Answer:
it is all of the above
Explanation:
How many protons, neutrons, and electrons does S^2- have
Answer:
The protons and electrons in each element are equal. The sulfur has 16 electrons and 16 protons. But the ionic atom's electron quantity changes depending on how many it has gained. 'S2-' has gained 2 electrons, which means it has now 18 electrons and 16 protons. 16 neutrons
Explanation:
Which statement describes how the sun gets its light?
A. It bends light.
B. It reflects light.
C. It refracts light.
D. It makes its own light.
Answer:
D
Explanation:
it's a star it has gas and makes it own light
How many moles in 206.91 g Na
Answer:
The answer is 9.000090040048176
Which process creates two new cells from one existing cell in order to maintain homeostasis? (4 points) a Cell division b Cellular respiration c Photosynthesis d Reparation
Answer:
Cell division.
Explanation:
Question 5 of 10 How are the different types of electromagnetic waves organized? A. By velocity on the electromagnetic spectrum B. By speed on the electromagnetic spectrum C. By frequency on the electromagnetic spectrum O D. By peak height on the electromagnetic spectrum
which an element that exist into two form
Answer:
Sulphur
Explanation
Rhombic and monoclinic sulphur are its allotropic forms
Question 9 of 10
What is stoichiometry used for?
A. Calculating the mass of a product from the number of moles of
B. Calculating the molarity of the limiting reagent used in a reaction
DC. Calculating the actual yield of a product in a chemical reaction
D. Calculating the weighted average atomic mass of an element
reactants
Stoichiometry is used for calculating the mass of a product from the number of moles of reactants. The correct option is A.
What is stoichiometry?
Stoichiometry is made up of two words, stoikhein, which means element, and metron, which means measure. Stoichiometry is a method of determining the data by using the knowledge of reactants and products.
There are five steps of stoichiometry that are the following:
Obtain all measurement information from the task.Change all measuring units to the same base units.Compose a thoughtful response.Ascertain the species' stoichiometry.Calculate the appropriate quantity in step five.Thus, the correct option is A. Calculating the mass of a product from the number of moles of reactant.
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How do cells prepare for sexual reproduction?
A. Punnett Square B. Meiosis C. Mendel D. Trait
Answer:
Meiosis
Explanation:
They just split in four.
A sample of hydrate sodium carbonate has a mass of 71.5 g. after heating, the anhydrous sodium carbonate has a mass of 26.5 grams. Calculate the % water.
Answer:
62.9%
Explanation:
Step 1: Given data
Mass of hydrate sodium carbonate (mNa₂CO₃.xH₂O): 71.5 gMass of anhydrous sodium carbonate (mNa₂CO₃): 26.5 gStep 2: Calculate the mass lost of water
We will use the following expression.
mH₂O = mNa₂CO₃.xH₂O - mNa₂CO₃
mH₂O = 71.5 g - 26.5 g = 45.0 g
Step 3: Calculate the percent of water in the hydrate sodium carbonate
We will use the following expression.
%H₂O = mH₂O / mNa₂CO₃.xH₂O × 100%
%H₂O = 45.0 g / 71.5 g × 100%
%H₂O = 62.9%
pleaseeee helpppp thank youu
Answer:
Answer: wellb. a type of gas is evolved ( hydrogen gas )
why are concerns like safety and recycling important in astronomy
Answer:
Keep the world safe and clean
Explanation:
safety = keep people inline and help them from making bad decisions
clean = keep the world from being polluted or trashy
Astronomy deals with the study of celestial objects such as moon, stars, sun, planets, etc.
Safety is the art of being protected from danger
Recycling is the process of waste conversion. That is, useful materials are generated from wastes.
Astronomers, in their exploration of extraterrestrial bodies, need to ensure that proper measures are taken to ensure their safety in these locations. Unhealthy practices such as deforestation and indiscriminate waste disposal may cause environmental hazards such as global warming. This is a threat to the atmosphere.
Therefore, wastes have to be converted to reusable products to discourage indiscriminate disposals. Hence the importance of the terms "safety" and "recycling" in astronomy.
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