Answer:
The molarity will be "0.26 M".
Explanation:
The given values are:
Mass,
= 2.00 g
Volume of solution,
= 100 mL
or,
= [tex]\frac{100}{1000}[/tex]
= [tex]0.1 \ L[/tex]
Molar mass of KCl,
= 74.5 gm
Now,
Moles of KCl will be:
= [tex]\frac{Given \ mass}{Molar \ mass}[/tex]
= [tex]\frac{2}{74.5}[/tex]
= [tex]0.026[/tex]
hence,
The molarity will be:
= [tex]\frac{Moles \ of \ solute}{Volume \ of \ solution}[/tex]
On substituting the values, we get
= [tex]\frac{0.026}{0.1}[/tex]
= [tex]0.26 \ M[/tex]
molecular formula of CH2O, 120 g/mol
When magnesium metal is burnt in air it reacts with both oxygen and nitrogen gses giving a white ash write to equatios for the reactions that take place
Answer:
See explanation
Explanation:
The most important thing to bear in mind when writing chemical reaction equation is that the equation must be balanced. A balanced chemical reaction equation is one in which the number of atoms of each element on the left and right hand sides of the reaction equation is exactly the same.
Equation of magnesium reaction with oxygen
2Mg(s) + O2(g) ------> 2MgO(s)
Equation of magnesium reaction with nitrogen
3Mg(s) + N2(g) ------> Mg3N2(s)
What causes the water to bend and the soda cans to roll?
Answer:
This is called static electricity, which means “non-moving electricity” The electrons have the power to pull very light objects (with a positive charge) toward them – like the soda can
Explanation:
what is the preasure in atmospheres of 20 mol of nitrogen gas in 36.2 L cylinder at 25 degrees C?
Answer:
P = 13.5 atm
Explanation:
Given that
No. of moles, n = 20 moles
Volume of nitrogen gas = 36.2 L
Temperature = 25°C = 298 K
We need to find the pressure of the gas. Using the ideal gas equation
PV = nRT
Where
R is gas constant, [tex]R=0.082057\ L-atm/K-mol[/tex]
So,
[tex]P=\dfrac{nRT}{V}\\\\P=\dfrac{20\times 0.082057\times 298}{36.2 }\\\\P=13.5\ atm[/tex]
so, the pressure of the gas is equal to 13.5 atm.
what is the energy needed to start a chemical reaction?
Answer:
Activation energy is called the energy required to initiate a chemical reaction.
Explanation:
find the average speed of a person who swims 105 m in 70 s
Answer:
1.5 m/s
Explanation:
105 / 70 = 1.5
Which of the following movements of ocean water has the greatest direct effect on the growth of producers.
A. Upwelling
B. Deep Current
C. Surface Current
D. Convection Current
Answer:
A- Upwelling
Explanation:
need help i will give you thanks:)
Answer:
Precipitation
Explanation:
Precipitation is when water falls from the clouds back to earth as rain, snow, or hail. The water returns to the rivers to continue the water cycle. So, the answer is D, precipitation.
I hope this helps :)
Answer:
Vapor Information
Explanation:
Atmospheric rivers are relatively long, narrow regions in the atmosphere like rivers in the sky that transport most of the water vapor outside of the tropics. Not all atmospheric rivers cause damage, and most are weak systems that often provide beneficial rain or snow that is crucial to the water supply.
(You're welcome and have a nice day/night Ma'am/Sir.)
Will mark brainly read it make sense no funny business
Answer: mixed
compound
Explanation:
A substance that catches fire and burns in air is said to be
Answer:
combustible.
Explanation:
The substances which burn in air are called combustible. Oxygen (in air) is essential for combustion. During the process of combustion, heat and light are given out.
Hope this helped!!!
Answer: flammable
Explanation:
According to the law of conservation of matter, the number of_______is not changed by a chemical reaction
A. Molecules
B. bonds
C. products
D. atoms
Answer:
Atoms
Explanation:
According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and kind of atoms after the chemical change as were present before the chemical change.
What is the mass of 2.40 mol H2O?
Answer in units of g.
Answer:
204
Explanation:
Which describes farsightedness?
Distant objects are blurry.
Concave lenses can correct it.
hurrry plz
Objects appear larger when wearing corrective glasses.
Corrective glasses do not change apparent the size of objects.
To solve this we must have a claeas concept behind Farsightedness and nearsightedness. Therefore, distant objects are blurry, describes farsightedness. The correct option is option A.
What is farsightedness?Farsightedness (hyperopia) is a common visual issue in which you can clearly see far things but have fuzzy vision of nearer items. Your capacity to focus is affected by your degree of farsightedness.
Farsightedness is most usually caused by an eyeball that is too short or by a cornea (the transparent layer at the front of the eye) that is not curved enough. Light cannot focus directly on the retina due to these two issues. Light instead concentrates behind the retina, making close-up objects appear fuzzy.
Therefore, distant objects are blurry, describes farsightedness. The correct option is option A.
To know more about farsightedness, here:
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A gas is collected at 30 Celsius and has a pressure of 200 kPa. What pressure would it exert if the temperature changed to 40 Celsius?
Answer:
[tex]206.6\ \text{kPa}[/tex]
Explanation:
[tex]P_1[/tex] = Initial pressure = 200 kPa
[tex]P_2[/tex] = Final pressure
[tex]T_1[/tex] = Initial temperature = [tex]30^{\circ}\text{C}[/tex]
[tex]T_2[/tex] = Final temperature = [tex]40^{\circ}\text{C}[/tex]
We have the relation
[tex]\dfrac{P_2}{P_1}=\dfrac{T_2}{T_1}\\\Rightarrow P_2=\dfrac{T_2}{T_1}P_1\\\Rightarrow P_2=\dfrac{40+273.15}{30+273.15}\times 200\\\Rightarrow P_2=206.6\ \text{kPa}[/tex]
The pressure that would be exerted after the temperature change is [tex]206.6\ \text{kPa}[/tex].
A sample of solid candle wax is put into a pot on the stove. Heat energy is transferred to the wax at a constant rate by the burner on the stove. Match the segments on the graph to the correct description of what is happening to the wax.
(match them)
Gaseous wax heating
melting
boiling
liquid wax heating
solid wax heating
A-B
B-C
C-D
D-E
E-F
Answer:
A-B : solid wax heating
B-C : melting
C-D : liquid wax heating
D-E : Boiling
E-F : Gaseous wax heating
A sample of solid candle wax is put into a pot on the stove. Heat energy is transferred to the wax at a constant rate by the burner on the stove. A-B is solid wax heating, B-C is melting, C-D is liquid wax heating, D-E is Boiling and E-F is Gaseous wax heating.
What is heating ?A heating system is a device that uses thermal energy to keep indoor temperatures within a house, workplace, or other structure at a comfortable level. portion of an HVAC system frequently. A heating system can be dispersed or centrally located.
The movement of minuscule atoms, molecules, or ions in solids, liquids, and gases produces heat energy. From one thing to another, heat energy can be exchanged. Heat is the flow or transfer that occurs as a result of the temperature differential between two objects.
When heat is applied to some substances, chemical changes or reactions occur that result in the formation of one or more new compounds with unique features.
Thus, A-B is solid wax heating, B-C is melting, C-D is liquid wax heating, D-E is Boiling and E-F is Gaseous wax heating.
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What is the mass of a substance that has a specific heat of 0.449 J/g°C and raises its temperature in a calorimeter from 20°C to 90°C when it releases 12,300 J of energy?
Answer:
6.094 j/g°C is the answer
SOMEONE HELP PLS! I missed a day and I need help rn
Answer:
D
Explanation:
Dimensional analysis is not just for science and math courses; it is
something you can use in everyday life. Let's say you are throwing a
birthday party for your friend, and you want to know how many cakes to
order. You are planning to invite 24 people to the party, and you assume
that each person will eat 1 piece of cake. If each cake will be cut into 8
w
pieces, how many cakes do you need to order? Show your work.
Answer:
Explanation
so, 1 cake would feed 8 people (if i am understanding correctly) this would mean you would need 3 cakes to feed 24 people.
1/8*24=3
I really hope this helps! Im sorry i couldnt do more
A student makes a sound by blowing into the mouth of an empty soda bottle. How could the student make the sound louder?
Answer:
Increase the amplitude by blowing with more force.
Explanation: I answered this.
Answer:
Increase the amplitude by blowing with more force
Explanation:
I took the test
Which reaction type is really part of another type of reaction but treated separately? Explain
Answer:
Oxidation - reduction reaction which is called redox reaction.
Explanation:
The type of reaction that is a part of another type but treated separately is called Oxidation - reduction reaction.
Thus is because they usually involve 2 separate half reactions which are oxidation reactions that involve loss of electrons and then reduction equations which involve gain of electrons.
They are treated separately for example when sodium reacts with chlorine to form sodium chloride.
2Na + Cl2 = 2NaCl
Now, sodium undergoes oxidation by loosing elctrons and it's half reaction is;
2Na → 2Na^(+) + 2e^(-)
Meanwhile chlorine undergoes reduction by gaining electrons and its half reaction is;
Cl2 + 2e^(-) → 2Cl^(-)
100 pts Horticulture (HURRY)
Which of the following corn pests causes galls to develop on the plant?
blight
rust
smut
mildew
Answer:
Option C, Smut
Explanation:
Corn smut is a condition in which mushroom-like tumors or galls appear on different part of the plant. This is caused by fungus Ustilago zeae. Corn smut is edible and appears grayish white with spony texture in the early stages of the infection promptly found on corn ear or tassel.
Hence, option C is correct
option c is the right answer❤️
The evidence of chemical changes with an example of each (include all 5)
Answer:
??????????
Explanation:
9)
How many grams are in 4.5 moles of sodium hydroxide (NaOH)?
Answer:
179.986995
Explanation:
1 mole is equal to 39.99711 grams.
so muitiply 39.99711 by 4.5 and get 179.986995
what is the enthalpy for 2H2S(g) + 3O2(g) -> 2H2O(I) + 2SO2(g). (∆H)
Answer:
2H2S (g) + 3O2 (g) → 2H2O (l) + 2SO2 (g)
Calculate ΔH° from the given data. Is the reaction exothermic or endothermic?
ΔH°f (H2S) = -20.15 kJ/mol; ΔH°f (O2) = 0 kJ/, mol; ΔH°f (H2O) = -285.8 kJ/mol; ΔH°f (SO2) = -296.4 kJ/mol
Based on information from the periodic table, what does this image represent?
A. A neutral fluorine atom
B. A negatively charged fluoride atom
C. A positively charged fluoride ion
D. A neutral neon atom
Based on the information given, the image represents a negatively charged fluoride atom (Option B)
Composition of atomAn atom is composed of a centrally placed nucleus (containing protons and neutrons) and a cloud of electrons revolving round it.
How to determine the chargeFrom the question given above, the following data were obtained:
Proton = 9Neutron = 10Electron = 10Charge =?Charge = Proton – Electron
Charge = 9 – 10
Charge = –1
Note
Element with proton number of 9 is fluorine
Thus, we can conclude that the image represents a negatively charged fluoride ion (Option B)
Learn more about composition of atoms:
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Answer:
B
Explanation:
1. Take 2-3 crystals of potassium permanganate and dissolve them in 100 mL of water.
2. Take out approximately 10 mL of this solution and put it into 90 mL of clear water.
3. Take out 10 mL of this solution and put it into another 90 mL of clear water.
4. Keep diluting the solution like this 5 to 8 times.
5. Is the water still coloured?
Answer:
2
Explanation:
1. Take 2-3 crystals of potassium permanganate and dissolve them in 100 mL of water.
2. Take out approximately 10 mL of this solution and put it into 90 mL of clear water.
3. Take out 10 mL of this solution and put it into another 90 mL of clear water.
4. Keep diluting the solution like this 5 to 8 times.
5. Is the water still coloured?
Can you balance an Egg on the Spring Equinox? R: Restate the Question * A: Answer the question * C: Cite your evidence E: Explain your answer *
Answer:
No you cannot balance an Egg on Spring Equinox without practice and the right egg
Explanation:
No you cannot balance an Egg on the spring Equinox and this is because it is just a Myth, according to Dr Harry E. Keller,
Balancing of an egg ( making an egg stand upright ) takes practice, Getting the right egg ( i.e. an egg with its yolk placed at the center of the egg ) and can be done anytime of the day and not just on spring equinox
All of the following explains why solar energy a better source of energy except:
Solar energy produces less toxic gas in the atmosphere.
Solar energy can be mined with less damage to ecosystems.
There is less environmental impact when collecting solar energy.
Solar energy is unlimited and easily captured from the Sun.
Answer:
Solar energy can be mined with less damage to ecosystems
Explanation:
solar energy isint mined, its collected and it is kinda bad for the environment when you mine the metals to get the solar panel
A construction company clears away 75 percent of a forest area for urban development. What will most likely happen to the carrying capacity and the populations of organisms in the remaining forest area?
Answer:
B. Their populations will decrease, and the carrying capacity will increase.
Explanation:
Please help me with this homework I really need help with this homework
Answer:
For the first question its C, Gas
For the second one table
Explanation:
The faster particles move, the more kinetic energy they have. Within a given substance, such as water, particles in the solid state have the least amount of kinetic energy. Particles in the liquid state move faster than particles in the solid state. Therefore, they have more kinetic energy.