Nung hoàn toàn 173,8g Kali pemanganat để điều chế khí oxi. a/ Tính thể tích khí oxi thu được (đktc). b/ Đốt 12,4g photpho trong lọ chứa khí oxi trên. Sau khi phản ứng kết thúc đưa que đóm còn tàn đỏ vào ống nghiệm thì que đóm có bùng cháy không? Vì sao

Answers

Answer 1

Answer:

45

Explanation:

because the number is right


Related Questions

What volume is occupied by 0.109 molmol of helium gas at a pressure of 0.98 atmatm and a temperature of 307 K

Answers

Answer:

2.8 L

Explanation:

From the question given above, the following data were obtained:

Number of mole (n) = 0.109 mole

Pressure (P) = 0.98 atm

Temperature (T) = 307 K

Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) =?

The volume of the helium gas can be obtained by using the ideal gas equation as follow:

PV = nRT

0.98 × V = 0.109 × 0.0821 × 307

0.98 × V = 2.7473123

Divide both side by 0.98

V = 2.7473123 / 0.98

V = 2.8 L

Thus, the volume of the helium gas is 2.8 L.

solve this question please!​

Answers

I don't know the answer ?

gujarati (language)

Ginger wanted to see how long it would take to get to Brownsville from Houston. If it is 570 kilometers (km) to Brownsville, how long would it take her if she could only drive an average speed of 60 km/hour

Answers

Answer:

9.5 hours/ 9 hours 30 mins

Explanation:

Distance = speed × time so

Time = Distance ÷ speed

= 570 ÷ 60

= 9.5 hours

Can someone help me with this one :")

Answers

Answer:

i think is probably A

Explanation:

because at constant temperature, the product of the pressure and volume of a given mass of and ideal gass in a closed system is always constant

Answer:

I believe the answer is A or D

Explanation:

I hope this helps you out!

draw the flow chart of production of silk from silk moth

please help....
no links or get reported ​

Answers

Too lazy to draw sorry lol.

#CarryOnLearning

I actually just looked it up via image search.

just copy by hand either of the flow charts.

if you can, use colors to fill. makes it more interesting to look at

and define a circle (or rather a few points on it) to draw it neatly. the defined points can later be transformed into the arrows.

Calculate the number of phosphorus atoms in 6.2g of phosphorus

Answers

Answer:

9.33 e22

Explanation:

For moles

N=m/M

N=6.2/40

N=0.155

For total no. Of atoms:

Atoms= N × 6.02e23

Atoms= 0.155× 6.02e23

Atoms= 9.33e22

When naming acids such as HCl, HBr, and HI, the prefix "hydro-" is added and the "ine" of the element is replaced with which of the following suffixes before the word "acid" is added?
Select one:
a. "-ic"
b. "-ate"
c. "-ite"
d. "-ide"

Answers

Answer:

a. "-ic"

Explanation:

The correct answer is a. "-ic".

For example:

For HCl, the name is Hydrochloric acid. As you can see, the suffix "-ine" of the element (originally chlorine) is changed to "-ic".

Following the same logic, the name for HBr is Hydrobromic acid; and the name for HI is Hydroiodic acid.

Methane is approximately 23 times more powerful than carbon dioxide as a greenhouse gas. Which are significant sources of methane emissions

Answers

Answer:

anthropogenic sources like landfills, agricultural activities,coal mining and combustion and some sources are natural ones

How many moles of carbon are in the sample?

Answers

Answer:

12.01 grams per mole

Explanation:

theres no sample or example so if theres grams of Carbon, convert it to moles using 12.01g/mol

PLEASE HELP

Which of the following correctly orders the types of radiation from the LONGEST wavelength to the SHORTEST wavelength?
A. Green Visible Light, Red Visible Light, Blue Visible Light, Ultraviolet
B. Microwave, Orange Visible Light, Ultraviolet, Violet Visible Light
C. Red Visible Light, Infrared, Microwaves, Radio waves
D. Microwave, Blue Visible Light, Ultraviolet, Gamma

Answers

Answer:

D. Microwave, Blue Visible Light, Ultraviolet, Gamma

Explanation:

colors longest to shortest are

red green blue violet

longest wavelength to shortest:

radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.

PLEASE HELP ASAP!!!!!!!!

Answers

Answer:

ouch......it's kinda a practical question..

Answer: ?

Explanation: what was the answer?

How are the boiling point and freezing point of a solvent affected when a solute is added?
Both the boiling point and the freezing point decrease.
Both the boiling point and the freezing point increase.
The boiling point increases, and the freezing point decreases.
The boiling point decreases, and the freezing point increases.

Answers

Answer:

this can helps you know the answer

Answer:

C.) The boiling point increases, and the freezing point decreases.

Explanation:


(Please Help)

1.What is the most common isotope for element X

2.Calculate the average atomic mass or element X

Answers

Answer:

1. Isotope 2 occurs most commonly

2. 39.02amu

Explanation:

1. Isotope 2 has a relative abundance of 78.68% i.e. 78.68 out of 100, hence, it is the isotope that occurs most commonly.

2. Isotope 1 = 9.67%, mass no: 38

Isotope 2 = 78.68%, mass no: 39

Isotope 3 = 11.34%, mass no: 40

Isotope 4 = 0.31%, mass no: 41

To find the average atomic mass of element X, we multiply each isotopes' relative abundance by its mass no and find the sum as follows:

We convert each percentage to decimal abundance:

Isotope 1 = 9.67% = 0.0967

Isotope 2 = 78.68% = 0.7868

Isotope 3 = 11.34% = 0.1134

Isotope 4 = 0.31% = 0.0031

(0.0967 × 38) + (0.7868 × 39) + (0.1134 × 40) + (0.0031 × 41)

3.6746 + 30.6852 + 4.536 + 0.1271

Average atomic mass = 39.02amu

Balance the following equation :

Sodium + water sodium hydroxide + hydrogen with steps​

Answers

Answer:

2Na + 2H2O → 2NaOH + H2

Explanation:

This is the balanced equation of,

Sodium + water → sodium hydroxide + hydrogen

A gamma wave has____
energy than a radio wave.
A television wave has a
th

Answers

Answer:

more

Explanation:

seems like you did not finish the questions

How did Rutherford's gold foil experiment show that Thomson's plum pudding model of the atom was
incorrect?

Answers

Answer:

He blasted alpha rays at the gold foils. The Alpha rays are charged positive. When he blasted them the protons deflected and changed the course of them and the electrons surrounding the atom let them through. In the plum pudding model they were supposed to be sprinkled on which was clearly wrong according to that experiment.

Explanation:

Complete the sentence

The Earth’s earliest atmosphere contained large amounts of carbon dioxide. The percentage of carbon dioxide in the Earth’s atmosphere today is ___

A) Less than 1%
B) 5%
C) 21%
D) 78%

Answers

Answer:

A) Less than 1%

Explanation:

The answer is approximately 0.04%


Can someone do a True or false for these

Answers

Answer:

all i can accurately say is that 2 and 4 are both true

The partial pressure of carbon dioxide in air varies with the seasons. Would you expect the partial pressure in the Northern Hemisphere to be higher in the summer or winter

Answers

Answer:

It will be higher in the summer.

Explanation:

Usually, the winter season is more harsh a weather on leaves than summer because it is wet season and thus has less sunlight and this means there will be less photosynthesis reactions and therefore it means the partial pressure will be lesser here unlike in the summer when it is a more warm and dry weather with sunlight where photosynthesis reactions will be more favorable to occur.

Thus, CO2 which is a great component of photosynthesis is used more in the summer and as such the partial pressure in the summer will be higher.

From the options provided for each element below, choose the properties that it may have based on its location in the periodic table.
Fluorine (F):

highly reactive nonmetal

shiny

a conductor

Answers

Answer:

highly reactive nonmetal

Explanation:

Fluorine is a member of group 7 elements on the periodic table called HALOGENS. Just like other members of its group like chlorine, iodine etc., fluorine is a nonmetallic element. Fluorine is regarded as the most reactive element on the periodic table because of its affinity to accept electrons i.e. most electronegative element.

According to this question, fluorine is an highly reactive nonmetal based on its location on the periodic table.

Answer:

highly reactive nonmetal

Explanation:

edge 21

The total kinetic energy of a body is known as:

A. Convection
B. Potential energy
C. Thermal energy
D. Temperature

Answers

Thermal energy!! I hope it helps!!

Answer: THERMAL ENERGY

Explanation: thermal is also known as heat and the body contains more of heat

hope it helps

A student is asked to separate two liquids. Liquid A boils at 100°C
and liquid B boils at 65 °C. The student sets up a fractional distillation
experiment, and after a few minutes a clear liquid is collected from the
condenser. Explain which of the two liquids will be collected first.

Answers

Answer:

liquid  B

Explanation:

because B has a lower bp it needs less time and energy to turn into vapour and is collected into the condenser first

what kind of food preserve for curing ​

Answers

Answer:

bitter leaf soups

Explanation:

because it cures gems out our body system

the sum of two numbers is 54 one exceed the other by 14 find the number​

Answers

Answer:

x=34

y=20

Explanation:

let the first number be 'x'

let the second number be 'y'

Equation 1:-

x + y = 54

Equation 2:-

x = y + 14  (Since one exceeds the other by 14)

Substituting Equation 2 in Equation 1:-

(y + 14) + y = 54

=> y + 14 + y = 54

=> 2y + 14 = 54

=> 2y = 54 - 14

=> 2y = 40

=> y = 40/2

=> y = 20

Now in Equation 1:-

x + y = 54

Substituting y=20,

x + 20 = 54

x = 54 - 20

x = 34

How does the alcohol enter the body? Describe the process. Where does most of the absorption take place?

Answers

Explanation: Once swallowed, a drink enters the stomach and small intestine, where small blood vessels carry it to the bloodstream. Approximately 20% of alcohol is absorbed through the stomach and most of the remaining 80% is absorbed through the small intestine.

A vehicle is moving with a velocity of 20 m/s.how far does it moves in one hrs

Answers

Distance= Speed x Time

1hr=60mins

60mins=3600 secs

20 x 3600=72000

72000 is your answer.

Help me please I really need this tomorrow

Answers

9.D

10.A

11.C

12.B

13.D

14.C

15.A

16.A

18.C

A toy plane has a mass of 2.5kg and is 18 m above the ground. It is moving 4.5 m/s.

how much mechanical energy does the toy have?
A. 416J
B. 441J
C. 466J
D. 491J

Answers

Answer:

466J (c)

Explanation:

Mechanical Energy= Kinetic+Potential

Potential energy= mgh

Plug in givens

mgh=2.5*18*9.8=441J

Kinetic Energy = 1/2mv^2

Plug in givens

1/2mv^2= 1/2(2.5)(4.5)^2= 25.3125J

Mechanical energy= 441J+25.3125J=466.3125J or 466J

The molar mass of oxygen(O) is 32g. What is the mass of 1.05*10^25 molecules of O²

Answers

Answer:

Hope that will help you

Explanation:

Text me for more answers

If an atom has 32 protons in the nucleus, how many electrons will it have orbiting the nucleus

Answers

An atom is neutral as it has the same number of electrons that of protons. So, if an atom has 32 protons i.e. the atomic number of it is 32, then it will have 32 electrons revolving the nucleus.

Other Questions
compare the tools used by the earliest people with those of modern times. HELP WILL GIVE BRAINLIEST What is implication for the Government in the tax policy ? 4m square - 8mn+3n ( resolve into factors) Which is a social benefit of abstinence- Reduce chance of becoming infertile- Less likely to develop testicular or breast cancer- Reduce dress about getting STDs- Opportunities to build emotional relationships before sexual ones P. S. The question is asking about "social" benefits Piliin ang mga pangyayaring nagbigay- daan sa Imperyalismong kanluranin sa Asya. Using the high-low method and the Millco data above, what is the approximate fixed cost component of the monthly maintenance costs? Group of answer choices who created a strong monarchy in england in 11th century? What is unit? Write down the units of mass, temperature and power Write a short note on you favourite country.[ Include information like, why you like it, your most favourite place there, its culture etc.] A system consists of multiple objects connected by ropes. How many equations need to be written to solve this problem?A) two for each objectB) one or two for each objectC) one for each objectD) two for the system The United Nations was started after the devastation of World War II to help prevent further wars in complex three international cooperation today to you and is involved in a variety of missions and has created a number of programs in organizations that are used throughout the globe give an example of these two programs and explain how they are used worldwide and what impact might have 1. The highest risk for the exporter is in a. Letter of credit c. Advance payment b. Bill of exchange d. Consignment sales The explicit rule for a sequence and one of the specific terms is given. Find the position of the given term.f(n) = 3.75n 27.5; 25Step 1 out of 2:You know that the value of f(n) is 25. Substitute 25 for f(n) in f(n) = 3.75n 27.5.25=3.75n 27.5=3.75n what is the meaning of "Ti amo"? Minimal sculpture, such as Untitled by John McCracken, is somewhatcontroversial. Is this work boring? If you were trying to convince a friend that itwas interesting, how would you go about it? What would you say? In which one of the following circumstances should a company's managers seriously consider modifying their strategy to strongly differentiate the company's branded footwear from the offerings of rival companies and achieve a competitive advantage based on a wide selection of 450-500 models/styles and "high" S/Q ratings? a) When one or more rivals produce and market branded footwear with the same (or higher) number of models/styles that the company is offering to the buyers of athletic footwear and also have below-average retail prices in the Internet segment and below-average wholesale prices in the Wholesale segment b) When many rival companies are spending heavily on retailer support and search engine advertising c) When one or more rivals also produce and market branded footwear having much the same (or higher) S/Q ratings and these rivals are offering higher mail-in rebates and delivering orders for branded footwear to footwear retailers in 1-2 weeks d) When the company is struggling to achieve the sales volumes needed to meet or beat the five investor-expected performance targets because the global marketplace for branded footwear is overcrowded with companies locked in a fierce competitive battle to sell 450- 500 models of branded footwear with high S/Q ratings at premium prices to the same comparatively narrow high-end buyer segment e) When the company's cost per branded pair sold is above the industry average in all four geographic regions Claire went to the animal shelter and noticed that 6/8 of the animals were rabbits. Out of all the rabbits 4/6 were female. What fraction of the animals were female rabbits?SHOW ALL WORK A wave pulse travels along a stretched string at a speed of 200 cm/s. What will be the speed if: a. The string's tension is doubled? b. The string's mass is quadrupled (but its length is unchanged)? c. The string's length is quadrupled (but its mass is unchanged)? d. The string's mass and length are both quadrupled? choose the correct sentence. a) nobody are to be blamed b) he regretted investing in the stock market.