Answer:
La energía necesaria para calentar el bloque de aluminio es 54927 J.
Explanation:
Se denomina calorimetría a la medición y el cálculo de las cantidades de calor que intercambia un cuerpo o un sistema.
De esta manera, entre el calor y la temperatura existe una relación de proporcionalidad directa (Dos magnitudes son directamente proporcionales cuando existe una constante de manera que cuando una de las magnitudes aumenta, la otra también; y lo mismo ocurre cuando alguna de las dos disminuye.). La constante de proporcionalidad depende de la sustancia que constituye el cuerpo como de su masa, y resulta el producto del calor específico por la masa del cuerpo. Entonces, la ecuación que permite calcular intercambios de calor es:
Q=c*m*ΔT
Donde Q es el calor intercambiado por un cuerpo de masa m, constituido por una sustancia de calor específico c y donde ΔT es la variación de temperatura.
En este caso:
c= 0.9 [tex]\frac{J}{g*C}[/tex]m= 850 gΔT= Tfinal - Tinicial= 94.6 C - 22.8 C= 71.8 CReemplazando:
Q= 0.9 [tex]\frac{J}{g*C}[/tex]*850 g* 71.8 C
y resolviendo se obtiene:
Q= 54927 J
La energía necesaria para calentar el bloque de aluminio es 54927 J.
Earth's polar regions have cold, dry climates because the sun's rays are at a ?
Answer:
not reaching to the polesExplanation:
Answer:
the rays strike at a low level in the polar region
Explanation:
okay so since the polar zones lie between 66.50 north or south the polar regions are always so cold is because strike the low parts
hope this helped!
Plz someone help, really struggling
How many liters of carbon monoxide are needed to react with 32.65 g oxygen gas to produce carbon dioxide?
Answer:
2.040 mol CO
Explanation:
First, write out your reaction:
CO + O2 --> CO2
Balance the reaction:
2CO + O2 --> 2CO2
Now divide the 32.65 g O2 by the molar mass of O2 (32.00 g/mol) to get moles of O2. Then multiply by the mole ratio of 2 mol CO for every 1 mol O2 to get moles of CO needed to fully react.
32.65 g O2 / 32.00 g/mol = 1.020 mol O2
1.020 mol O2 • 2 mol CO / 1 mol O2 = 2.040 mol CO
Higher volumes of water can carry greater loads.
true
false
Answer:
True
Explanation:
Because density of water decreases as volume increases as mass increases too.
Hence greater loads can be carried.
A 4.00g sample of gas is found to exert a pressure of 1.71 atm when confined in 3.60L container at a temperature of 24
Answer:
There are 0.311 moles of gas in the tank
Explanation:
Complete question
A 4.00g sample of gas is found to exert a pressure of 1.71 atm when confined in 3.60L container at a temperature of 241 K. Find the number of moles of the gas
Solution
As we know
[tex]PV = nRT[/tex]
where P is the pressure of the gas in atm
V is the volume in liters
n is the number of moles
R is the gas constant = 0.08206 L·atm/K·mol
and T is the temperature in Kelvin
Substituting the given values in above equation, we get -
[tex]1.71 * 3.60 = n * 0.08206 * 241\\n = 0.311[/tex]
There are 0.311 moles of gas in the tank
What do plants do that requires Energy?
Answer:
Photosynthesis
Explanation:
Photosynthesis uses energy from light to convert water and carbon dioxide molecules into glucose (sugar molecule) and oxygen. The oxygen is released, or “exhaled”, from leaves while the energy contained within glucose molecules is used throughout the plant for growth, flower formation, and fruit development.
10. Air is a homogenous mixture of gases. Oxygen is 20% by volume of air typically. What
amount of moles of oxygen is present in 20 L of air at STP?
Answer:
893 moles
Explanation:
An ideal gas at STP occupies 22.4 liters. Calculating Oxygen as if it were an ideal gas there are . 893 moles of Oxygen in 20.0 liters.
THIS IS A THREE PART QUESTION IF YOU CAN HELP IT WOULD BE REALLY APPRECIATED SO I DONT FAIL.
1. If I add 2.65L of water to 245 grams of sodium acetate, what is the molarity of the NaC2H3O2 solution?
A. 10.8 m
B. 1.13 m
C. 1.08 m
D. 92.4 m
2. If I add 2.65 L of water to 245 grams of sodium acetate, what is the % by mass of NaC2H3O2 in this solution?
A. 8.46%
B.1.12%
C.10.8%
D.9.25%
3. If I add 2.65 L of water to 245 grams of sodium acetate, what is the mol fraction of NaC2H3O2 in this solution?
A. 0.203
B. 0.0846
C. 0.108
D. 0.0199
Answer:
1. B = 1.13M
2. A. 8.46%
3. D = 0.0199
Explanation:
1. Molarity of a a solution = number of moles of solute/ volume of solution in L
Number of moles of solute = mass of solute/molar mass of solute
Molar mass of NaC₂H₃O₂ = 82 g/mol, mass of NaC₂H₃O₂ = 245 g
Number of moles of NaC₂H₃O₂ = 245 g / 82 g/mol = 2.988 moles
Molarity of solution = 2.988 mols/ 2.65 L = 1.13 M
2. Percentage by mass of a substance = mass of substance /mass of solution × 100%
Mass of 2.65 L of water = density × volume
Density of water = 1 Kg/L = 1000 g/L; volume of waterb= 2.65 L
Mass of water = 1000 g/L × 2.65 L = 2650 g
Mass of solution = mass of water + mass of solute = 245 + 2650 =2895 g
Percentage by mass of NaC₂H₃O₂ = 245/2895 × 100% = 8.46%
3. Mole fraction of NaC₂H₃O₂ = moles of NaC₂H₃O₂/moles of solution
Moles of water = mass /molar mass
Mass of water = 2650 g; molar mass of water = 18 g/mol
Moles of water = 2650 g / 18 g/mol = 147.222 moles
Moles of solution = moles of solute + moles of water = 147.222 + 2.988 = 150.21
Moles of NaC₂H₃O₂ =2.988 moles
Moles fraction of NaC₂H₃O₂ =2.988/150.21 = 0.0199
Pt4 science......
Select correct answer ♡ !
What is the correct term for a community of plants and animals and their physical surroundings?
individuals (organism)
continent
territory
ecosystem
What are the three components of a circuit
Yup I’m a kid-
Answer:
it's B(Energy source,conductor and receiver)
A scientist combines three atoms of chlorine and six atoms of sodium resulting in a chemical reaction. How many atoms of chlorine must be in the product?
I uploaded the answer to a file hosting. Here's link:
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what type of wave moves the particles parallel to the motion of the wave
a.electromagnetic
b. longitudinal
c. transverse
d.water
Answer:
c
Explanation:
HOW DO THE STATES OF MATTER FIT INTO THE K-M THEORY? PLS NO LINKS
Answer:Matter can exist in one of three main states: solid, liquid, or gas. Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around.
Explanation:
When we look at heat transfer problems that include phase transitions, there can bemanynec-essary steps. Consider a material of massmthat undergoes two phase transitions: from solid toliquid and then from liquid to gas. It starts at an initial temperature ofT0(well below the meltingtemperature ofTm) and it heated until it is a gas at a temperature ofTf(well above the boilingtemperature ofTv). How many different steps (simple temperature changes or phase transitions)of heat transfer would you need for this problem
Answer:
There would be 3 temperature changes and 2 phase transitions
Explanation:
The temperature of the material would first increase from T0 to Tm (its melting point)- This is one temperature change.
It would the change from solid to liquid at its melting point Tm.- This is one phase transition.
Its temperature would then increase from its melting point Tm to its boiling point Tv -This is another temperature change.
It would then change from liquid to gas at its boiling point Tv - This is another phase transition.
Finally, its temperature would then increase from its boiling point to T(f) - This is the third temperature change.
So, there would be 3 temperature changes and 2 phase transitions
What fossil helped support Wegener's hypothesis of continental drift?
A. Gondwanaland
B. Kannemeyerid
C. Mesosaurus
D. Glossopteris
Answer:
Glossopteris
Explanation:
Glossopteris is a fossil fern that helped support Wegener's hypothesis.
Hope this helps! Have a great day!
Explain Newton’s third law of motion.
Answer:
His third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A. Notice that the forces are exerted on different objects.
Explanation:
What is true about endothermic reactions?
Endothermic reactions release heat to the surroundings.
The enthalpy of products in endothermic reactions is lower than the enthalpy of reactants.
The enthalpy of an endothermic reaction is positive.
Endothermic reactions have an enthalpy of zero.
Answer:
The enthalpy of an endothermic reaction is positive, I believe.
''The enthalpy of an endothermic reaction is positive'' is the true statement about endothermic reaction
What is enthalpy of endothermic reaction?If a reaction absorbs more energy than releasing it, the reaction is considered as endothermic and enthalpy will be positive while on the other hand, if a reaction absorbs less energy and releasing more, the reaction is considered as exothermic and enthalpy will be negative.
So we can conclude that option C is the right answer.
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Please someone help me and all of the terms do not have to eh used
Answer:
The correct answer is -
1. D. mold
2. A. Cast
3. F. trace fossil
4. C. original material fossils
5. B. fossil record.
Explanation:
Mold is the impression of an organism in a rock that occurs due to the complete dissolving of the organism and only an impression left in sedimentary rocks.
The cast is a fossil copy of an organism in a rock that takes place when water-containing minerals fill the molds and creates a three-dimension copy of the fossil.
Trace fossils are the fossils that are preserved in such a manner that records of biological activity stored only instead of remains of plants or animals.
Storing originals animals or parts of the remaining such as tissue of an organism in natural form is known as original-material fossils.
Fossil records are the fossils ever found or discovered on the earth.
help asap show work | a gas with a volume of 13L at a pressure of 197 kPA is allowed to expand to a volume of 23L. what is the pressure of the container if the temperature remains constant
Answer:
111 kPaExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we're finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
We have
[tex]P_2 = \frac{13 \times 197000}{23} = \frac{2561000}{23} \\ = 111347.826...[/tex]
We have the final answer as
111 kPaHope this helps you
You and your Canadian pen pal enjoy talking about nature together. While your friend describes some birds that she saw today, you realize that one of the birds she described sounds like one you have seen in your home state of Indiana. You remember that all organisms have common and scientific names. Which would be most appropriate to use to confirm with your friend? (1 point) O You should use the bird's common name since it is easier to pronounce than the scientific name. You should use the scientific name because it is local to North America. O You should use the bird's scientific name since that name is the same everywhere in the world. You should use the bird's common name since it is based on the bird's characteristics. he
Answer:
you should use the scientific name because it is the same everywhere in the world
Explanation:
the scientific name of anything and everything is the same around the world.
why does the sky appear orang or red at sunset and sunrise?
Answer:
Because the sun is low on the horizon, sunlight passes through more air at sunset and sunrise than during the day, when the sun is higher in the sky. More atmosphere means more molecules to scatter the violet and blue light away from your eyes.
What is the molar mass of Fe2(CO3)3?
Answer:
291.7167
Explanation:
The molar mass of Fe₂(CO₃)₃ is 291.714 g/mol.
To calculate the molar mass of Fe₂(CO₃)₃, we need to consider the atomic masses of the individual elements present in the compound.
The molar mass of each element is as follows:
Fe (iron): 55.845 g/mol
C (carbon): 12.011 g/mol
O (oxygen): 15.999 g/mol
Now, let's calculate the molar mass of Fe₂(CO₃)₃:
Molar mass = (2 × atomic mass of Fe) + (3 × atomic mass of C) + (9 × atomic mass of O)
Molar mass = (2 × 55.845 g/mol) + (3 × 12.011 g/mol) + (9 × 15.999 g/mol)
Molar mass = 111.69 g/mol + 36.033 g/mol + 143.991 g/mol
Molar mass = 291.714 g/mol
Therefore, the molar mass of Fe₂(CO₃)₃ is approximately 291.714 g/mol.
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PLEASE ANSWER!!!!!! WILL MARK BRAILIEST!!!! TYSM!!
Weathering (breaking off sediments upriver), erosion (moving the sediments down river) and finally deposition caused the changes in the river.
What helps hold sediments in place to prevent erosion?
Answer:
Explanation:
Maintaining a healthy, perennial plant cover.
Mulching.
Planting a cover crop – such as winter rye in vegetable gardens. ...
Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.???
The results of photosynthesis as glucose and oxygen
A) Photosynthesis
B)Products
C)Chloroplasts
D)Glucose
Answer:
Products
Explanation:
How many molecules is 7.22 mole H2O
Answer:
no H2O molecules are produced:)
Explanation:
Answer: 18 g of water occupies one mole and one mole contains Avagadro’s no. of molecules = 6.023*10^23 molecules .
Explanation:question says 72 g of water . 72 g of water occupies 4 moles.
So the no. of molecules in 72 g of water has 4*(6.023*10^23) molecules .
If 148.8 grams HCl reacts with excess Zn, how many moles of ZnCl2 could be
formed? (Molar mass of HCI=36.46 g/mol)
Answer:
2.04moles
Explanation:
The balanced chemical equation of this reaction is given as follows:
Zn + 2HCl → ZnCl2 + H2
Based on the above balanced equation, 2 moles of hydrochloric acid (HCl) reacts to produce 1 mole of Zinc chloride (ZnCl2).
The question states that 148.8 grams HCl reacts. We need to convert this value to mole by using the formula;
mole = mass/molar mass
Molar mass = 36.46g/lol
mole = 148.8/36.46
mole = 4.08moles of HCl
Hence, if 2 moles of hydrochloric acid (HCl) reacts to produce 1 mole of Zinc chloride (ZnCl2).
Then, 4.08moles of HCl will react to produce (4.08 × 1/2)
= 2.04moles of ZnCl2.
if i want to make 14 moles of potassium chloride, how many grams of potassium do i need? Show all work. Make sure to include unit and substance
Answer:
The answer is 0.013413582325191. i assume you are converting between moles Potassium Chloride and gram. The molecular formula for Potassium Chloride is KCl. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Potassium Chloride, or 74.5513 grams.
Explanation:
CH3(ch2)2C(ch3)3 IUPAC name please?
Answer:
Explanation:
The name is of the compound is 3,3,4,4-tetramethylhexane.
Explain why a change to the green-leaf population caused the wee-bug population to change in size?
Answer:
If there are fewer births than deaths, then the size of the population will decrease. Organisms in consumer populations get energy storage molecules from eating organisms in resource populations. The more energy storage molecules available to a population, the more the organisms in that population can reproduce.
A change to the green-leaf population caused the wee-bug population to change in size because wee-bug depends upon green leaves for their food.
What is the population?It is a group of organism of the same species living in a particular area.
The increase or decrease in the population of organisms depends upon factors such as available resources and predator population.
The green leaf is the food resource for wee bugs hence if the green leaf population increase then the wee bug's population will also be increased.
Therefore, a change to the green-leaf population caused the wee-bug population to change in size because wee-bug depends upon green leaves for their food.
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