Answer:
See Explanation
Explanation:
Ionic compounds are composed of crystals. The crystal structure of an ionic compound is responsible for its hardness.
A crystalline solid contains a well organized structure which enables it to be hard and have a particular geometric shape as well defined melting point.
Hence, all the observed characteristics of NaCl are the result of its crystalline structure.
How many grams of Potassium are in 10 moles of potassium?
Answer:
You can view more details on each measurement unit: molecular weight of Potassium or grams The molecular formula for Potassium is K. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Potassium, or 39.0983 grams.
Explanation:
What is a gas’s temperature in Celsius when it has a volume of 25 L, 203 mol, 143.5 atm?
To Find :
Gas’s temperature in Celsius when it has a volume of 25 L, 203 mol, 143.5 atm .
Solution :
We know, by ideal gas equation :
[tex]PV =nRT\\\\T = \dfrac{PV}{nR}[/tex]
Here, R is universal gas constant and [tex]R = 0.082 \ L \ atm \ mol^{-1} \ K^{1}[/tex]
Putting all given values and R in above equation, we get :
[tex]T = \dfrac{PV}{nR}\\\\T = \dfrac{143.5\times 25}{203 \times 0.082}\ K\\\\T = 215.52\ K[/tex]
Hence, this is the required solution.
where is reverse osmosis used
Answer:
Reverse osmosis systems find frequent use in the following: Boiler feed-water treatment: used to reduce solids content of waters prior to feeding into boilers for power generation or otherwise.
Explanation:
Calculate the mass of oxygen produced when 2000 kg of aluminium oxide is completely electrolysed.
Answer:
Explanation:
Given that:
The mass of aluminium oxide Al₂O₃ = 2000 kg = 2000 000 g
Molar mass of Al₂O₃ = 101.96 g/mol
no of moles = mass / molar mass
no of moles of Al₂O₃ = 2000 000 g/ 101.96 g/mol
no of moles of Al₂O₃ = 19615.4 mol
From the reaction:
4Al + 3O₂ ⇒ Al₂O₃
To determine the moles of O₂ in Al₂O₃:
Then;
19615.4 mol * 3/2 mol of O₂ = 29423.1
The mass of oxygen now = 29423.1 × 32 g
= 941539.2 g
To kg;
= (941539.2 / 1000) kg
= 941.5 kg
Q1 and Q1 represent ?
Answer:yes they do represent
Help! Locks at 12
Given the balanced equation representing a nuclear reaction:
Which particle is represented by X?
Answer is #4 (neutrons)
Explanation:
Total mass before the reaction is 236 amu. The total mass of the two elements is 233 amu. This means that there are 3 amus carried by element X. Looking at the total atomic number of the two elements after reaction, it's 92, the same as the one at the beginning. This means that element X has zero atomic number, which could only be a neutron.
Answer: is 4
Explanation:
I was doing the same one
A mixture of gases with a pressure of 900 mm Hg contains 20% of oxygen and 80% of nitrogen by volumeWhat is the partial pressure of the oxygen gas in the mixture?
A-45mmHg
B-180mmHg
C-210 mmHg
D-320 mmHg
Answer:
180 mmHg
Explanation:
Total volume of gases = 20% + 80%= 100%
Total pressure of gases = 900 mm Hg
Note that partial pressure of a gas = mole fraction × total pressure
Mole fraction of oxygen = 20/100
Hence partial pressure of oxygen= 20/100 × 900 mm Hg
partial pressure of oxygen= 180 mmHg
A haloalkane 'X' if heated with sodium metal in presence of dry ether produces
2,3 - dimethyl butane
as major product
Identify x with chemical reaction.
Answer:
2 halo - propane
Explanation:
We are told that a halo alkane is heated with sodium in the presence of dry ether to produce 2,3 - dimethyl butane.
Now, according to Wurtz reaction this formation from heating with sodium in the presence of dry ether is done by 2 alkyl halides in the form of;
2RX + 2Na → R−R + 2Na+X−
Now, formula for 2,3 dimethyl butane is (CH₃)₂CHCH(CH₃)₂
Thus, from the Wurtz reaction, we can write that;
2RX + 2Na → (CH₃)₂CH - CH(CH₃)₂ + 2Na+X−
So, R = (CH₃)₂CH
This means the original halo alkane has 3 carbon atoms and thus, we can say it is 2 halo - propane.
What are 1A, 3B, and 7A examples of on the periodic table?
groups.
numbers
periods
O rows
Answer: Groups
Explanation:
I took the quiz
Perform the following
mathematical operation, and
report the answer to the
correct number of significant figures.
7.68 x 4.564 = [?]
Answer: The correct number of significant figures in [tex]7.68 \times 4.564[/tex] is 35.05152.
Explanation:
Digits present in a number that helps in determining the degree of accuracy starting from the first non-zero digit is called a significant figure.
Some rules for significant figures are as follows.
All the digits present within the non-zero digits are considered in a number.For example, 2085 contains 4 significant digits.
Leading zeros are not counted in a number.For example, 0.0034 has 2 significant digits.
We count the trailing zeros when a decimal point is present in a number.For example, 0.02500 has 4 significant figures.
When there is no decimal point then trailing zeros may or may not count.For example, 19000 has 2 significant digits.
Now, the product of given digits is as follows.
[tex]7.68 \times 4.564 = 35.05152[/tex]
Thus, we can conclude that correct number of significant figures in [tex]7.68 \times 4.564[/tex] is 35.05152.
NEED HELP!! See picture for question!
Answer: The answer is A.
How many moles are in 50 grams of CO2?
Answer:
The answer is 44.0095. We assume you are converting between grams CO2 and mole.
I hope it help you
Plzzzzzzzzzzzzzzzz can you follow me please
two types of fine chemical
Answer:
Flavors and fragrances
Substances that have a pH
7 are considered acidic.
Answer:
False because pH value below 7 are considered acidic.
Answer:
Any solution that has a pH of less than 7 is considered acidic, and anything above a pH of 7 is basic .
Explanation:
Is 1 mole of Na equal or not equal to Avogadro's number?
Answer:
nooooo it is not equal to it
if 5.0g zinc reacts with 10.0 g hci to produce h2 gas and znci2 according to the following equation zn=2hci znci2 + h2 what is the limiting reactant and how many grams of h2 will be produced
Answer: The mass of [tex]H_2[/tex] produced is 0.153 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
For zinc:Given mass of zinc = 5.0 g
Molar mass of zinc = 65.38 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of zinc}=\frac{5.0g}{65.38g/mol}=0.0765mol[/tex]
For HCl:Given mass of HCl = 10.0 g
Molar mass of HCl = 36.46 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of HCl}=\frac{10.0g}{36.46g/mol}=0.274mol[/tex]
The given chemical equation follows:
[tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
By stoichiometry of the reaction:
If 1 mole of zinc reacts with 2 moles of HCl
So, 0.0765 moles of zinc will react with = [tex]\frac{2}{1}\times 0.0765=0.153mol[/tex] of HCl
As the given amount of HCl is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Thus, zinc is considered a limiting reagent because it limits the formation of the product.
By the stoichiometry of the reaction:
If 1 mole of zinc produces 1 mole of [tex]H_2[/tex]
So, 0.0765 moles of zinc will produce = [tex]\frac{1}{1}\times 0.0765=0.0765mol[/tex] of [tex]H_2[/tex]
We know, molar mass of [tex]H_2[/tex] = 2 g/mol
Putting values in above equation, we get:
[tex]\text{Mass of }H_2=(0.0765mol\times 2g/mol)=0.153g[/tex]
Hence, the mass of [tex]H_2[/tex] produced is 0.153 g
Explain why ionic compounds have such high melting and boiling points
i need help asap please :) it says to “identify the reactants.”
the options are
A: Carbon Dioxide and water
B: Glucose and oxygen
C: sunlight and chlorophyll
The reactants are A: Carbon Dioxide and water
Add 250.0mL to 5.00mL and round off the answer
Answer:
255mL
Explanation:
(250.0 + 5.00)mL = 255.00mL
255mL
What is ppm?
A. Concentration of a solute in grams/106 grams solution
B. Concentration of a solute in mol/L solution
C. Concentration of a solute in mol/kg solvent
D. Concentration of a solute in mol/mol solution
SUBMIT
HURRY!!!!
Answer:
This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contaminate per unit volume of water. Seeing ppm or mg/L on a lab report means the same thing.
What is the energy of a photon that emits a light of frequency 6.42 x 1014 Hz?
Answer:
Option B. 4.25×10¯¹⁹ J
Explanation:
From the question given above, the following data were obtained:
Frequency (f) = 6.42×10¹⁴ Hz
Energy (E) =?
Energy and frequency are related by the following equation:
Energy (E) = Planck's constant (h) × frequency (f)
E = hf
With the above formula, we can obtain the energy of the photon as follow:
Frequency (f) = 6.42×10¹⁴ Hz
Planck's constant (h) = 6.63×10¯³⁴ Js
Energy (E) =?
E = hf
E = 6.63×10¯³⁴ × 6.42×10¹⁴
E = 4.25×10¯¹⁹ J
Thus, the energy of the photon is 4.25×10¯¹⁹ J
Answer:
B. 4.25 x 10-19J is correct via a p e x
Explanation:
Hospital patients are administered oxygen from an pressurized
hyperbaric oxygen chamber. 600.0 L of oxygen is compressed in a
cylinder at 160.0 atm. What volume of oxygen can a cylinder supply at a
pressure of 3.0 atm?
Answer:
32000atm
Explanation:
Using Boyle's law equation;
P1V1 = P2V2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (
V2 = final volume (L)
According to the question below:
P1 = 160.0 atm
P2 = 3.0 atm
V1 = 600L
V2 = ?
Using P1V1 = P2V2
160 × 600 = 3 × V2
96000 = 3V2
V2 = 96000/3
V2 = 32000atm
Write a neutralization reaction to form the salt k2so4
H2SO4 + 2KCL ----------› K2SO4 + 2HCL
hope it helps you ♡♡
Which is most likely a physical change?
Answer:
Examples of physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.
Explanation:
The temperature of a 95.4 g piece of copper decreases from 48°C to 25°C when the copper releases - 849 J of heat. What is the specific heat of copper?
I'll give brainliest. My group has been struggling to answer this. We just need a solid answer with work to pick up our grades at least.
How many grams of Al(OH)3 are produced from 3.00 g of AlCl3 with excess of NaOH?
Explanation:
here u go the Answer with the working:)
how many types of kinetic energies are there? is it 4 or 5 types?
This chemical reaction follows the law of conservation of mass. CaO(s) + CO2(g) - CaCO3(s) How much CaCO, will be formed if 2.2 grams of CaO are used for this reaction? Assume there are enough reactants to complete the reaction. The final answer should be rounded to one place after the decimal point.
4.3 grams 2.2 grams 1.1 grams 3.9 grams
please answer quick!
Answer:
the answer is 1.1grams is the currect ans
According to the law of conservation of mass, 1.1 grams of calcium carbonate are formed if 2.2 grams of CaO are used for this reaction.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.If 56 g CaO gives 46.2 g calcium carbonate then 2.2 g CaO will give 2.2×46.2/56=1.1 g.
Learn more about law of conservation of mass, here:
https://brainly.com/question/28711001
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Calculate the molality of a solution that contains 51.2 g of naphthalene, C10H8, in 500 mL of carbon tetrachloride. The density of CCl4 is 1.60 g/mL.
Answer: The molality of naphthalene solution is 0.499 m
Explanation:
Density is defined as the ratio of mass and volume of a substance.
[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}} [/tex] ......(1)
Given values:
Volume of carbon tetrachloride = 500 mL
Density of carbon tetrachloride = 1.60 g/mL
Putting values in equation 1, we get:
[tex]\text{Mass of carbon tetrachloride}=(1.60g/mL\times 500mL)=800g[/tex]
Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molarity:
[tex]\text{Molality of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent (in g)}}[/tex] .....(2)
Given values:
Given mass of naphthalene = 51.2 g
Molar mass of naphthalene = 128.17 g/mol
Mass of solvent = 800 g
Putting values in equation 2, we get:
[tex]\text{Molality of naphthalene}=\frac{51.2\times 1000}{128.17\times 800}\\\\\text{Molality of naphthalene}=0.499m[/tex]
Hence, the molality of naphthalene solution is 0.499 m
how does a scientist answer a scientific question
Answer:
Observes and measure
Explanation:
Answer:
they use tests
Explanation:
they search for evidence using experiments,an experiment is a test to see if their explanation is right or wrong. evidence is made up of observations a scientist makes during an experiment
