Answer:
summer
The North Pole stays in full sunlight all day long throughout the entire summer (unless there are clouds)
Answer:
summer
Explanation:
hope this helps :)
If .45 moles of water vapor is produced in a chemical reaction that occurs at STP how many liters of water are produxed
Answer:
10.1 L
Explanation:
At STP (meaning T = 273 K and P = 1 atm) one mol of any given gas will occupy 22.4 liters.
With the above information in mind, we can calculate how many liters will 0.45 moles of water vapor occupy:
0.45 mol * 22.4 L / mol = 10.1 LMeaning that if 0.45 moles of water are produced at STP, 10.1 liters of water would be produced.
find the average speed of a person who swims 105 m in 70 s
Answer:
1.5 m/s
Explanation:
105 / 70 = 1.5
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?
85 grams of CO2 to molecules
Answer:
co2 = 44,01 g/mol
85\44= 1,93 mol
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.
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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
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:
Will mark brainly read it make sense no funny business
Answer: mixed
compound
Explanation:
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:
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
what is the energy needed to start a chemical reaction?
Answer:
Activation energy is called the energy required to initiate a chemical reaction.
Explanation:
Tara is performing a chemical experiment, at one point she needed to know whether the solution is acidic or basic so she used the PH meter to measure the solution. She got a reading of 13.4,
1. Is the solution acidic or base? Explain why.
2. What will happen to the PH when she will add water to the solution?
It is a base because its pH is greater than 7
(not sure about the second sorry!)
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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SOMEONE HELP PLS! I missed a day and I need help rn
Answer:
D
Explanation:
I WILL Give BRAINLIST Unlike protists, organisms in the group Animalia
A
have cells with no cell wall and have an organ system.
B
have cells with a cell wall and are heterotrophic.
C
are complex and photosynthetic.
D
are all mobile and autotrophic.
Answer:
B
Explanation:
B
have cells with a cell wall and are heterotrophic
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:
A hydroelectric dam produces renewable energy for the local area. Which best explains why more hydroelectric dams are not built?
Answer:
The dam disrupts the river wildlife and ecosystem.
Explanation:
Though it is believed that using the dam as a power generation or hydroelectric power supply generates no greenhouse gases, it, however, has many disadvantages which make it deemed not suitable or sustainable for use in the contemporary time.
Majorly, the top reason why more hydroelectric dams are not built is that "the dam disrupts the river wildlife and ecosystem."
Also, it affects the water quality and other use of water for humans such as recreational use.
There is also a possible chance of dams producing methane; a greenhouse gas through the organic materials in the water that is rotting.
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
If there are 6 waves in a 2-second time frame, what is the frequency
Answer:
3 Hz
Explanation:
frequency = [tex]\frac{number of waves}{time}[/tex]
thus [tex]f=\frac{6}{2}[/tex] = 3 Hz
If there are 6 waves in a 2-second time frame, the frequency is 3 Hz. When a wave travels through a medium, the frequency describes how frequently the medium's particles vibrate.
What is the frequency of a wave?The frequency identifies the frequency at which the particles of the medium vibrate as a wave passes through it.
Frequency = number of waves ÷time
The number of waves is 6 and time is 2 second
f = 6 ÷ 2
= 3
A disturbance or variation that causes energy to be transferred gradually from one point to another in a medium. It can be an elastic deformation or a change in pressure, electric potential, electric or magnetic intensity, or temperature.
Therefore, if there are 6 waves in a 2-second time frame, the frequency is 3 Hz.
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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
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 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.
Which Statements below are true?
A. If motion starts and stops at the same location, then the displacment is zero.
B. Displacement can be fully described with a magnitutde and a unit.
C. Distance measurements must incude magnitude, unit, and direction.
D. Distance is always greater than or equal to the magnitutde of the displacement.
A. If motion starts and stops at the same location, then the displacment is zero.
D. Distance is always greater than or equal to the magnitutde of the displacement.
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
6. For a chemical reaction, the heat of reaction is equal
to the
Answer:
internal energyExplanation:
At constant pressure, the heat of reaction is equal to the enthalpy change of the system. Most chemical reactions occur at constant pressure, so enthalpy is more often used to measure heats of reaction than internal energy
For a chemical reaction, the heat of reaction, also known as enthalpy change (∆H), is equal to the difference between the total energy of the products and the total energy of the reactants.
Enthalpy change represents the amount of heat energy exchanged or released during the course of a reaction. The heat of reaction can be positive (endothermic), indicating that the reaction absorbs heat from the surroundings, or negative (exothermic), indicating that the reaction releases heat to the surroundings.
The magnitude of the heat of reaction is a measure of the amount of heat energy involved in the reaction.
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Calculate the volume, in liters, of 4 mol H2S at 60 degrees celsius and 200 KPa? Show your work
(R=8.31) (K= *C + 273) (PV= nRT)
Answer: 55.345L
Explanation:
PV=nRT
PV=4R(333)
200V=4(8.31)333
200V=11069
V=11069/200
V=55.345L
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^(-)
What is the empirical formula for a compound that has 31.2% calcium, 18.8% carbon,
and 50% oxygen
Answer:
CaC2O4
Explanation:
What is the mass of 2.40 mol H2O?
Answer in units of g.
Answer:
204
Explanation:
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