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.
A building is found to be losing heat to the outside during the winter months. Which would be the best solution to correct this design problem?
increase amount of heating
increase surface area of walls
increase number of windows
increase thickness of insulation
no link or I will report
Answer:
increase thickness of insulation
Explanation:
don't increase amount of heating because that's difficult and not efficient.
don't increase surface area of walls because that makes heat be lost quicker.
don't increase windows because windows lose heat worse than walls.
increase thickness of insulation because it's the most effiecient and effective method of keeping heat.
plss help me in this question
Answer:
[tex]m_{CO_2}=0.88g[/tex]
Explanation:
Hello there!
In this case, since we are talking about a decomposition reaction whereby calcium carbonate is decomposed to calcium oxide and carbon dioxide according to the following chemical equation:
[tex]CaCO_3\rightarrow CaO+CO_2[/tex]
Next, we must recall the law of conservation of mass which states that matter cannot be neither created nor destroyed so the mass of calcium carbonate equal the addition of the mass of both calcium oxide and carbon dioxide:
[tex]m_{CaCO_3}=m_{CaO}+m_{CO_2}[/tex]
Which must be solved for the mass of carbon dioxide as we are given those of calcium carbonate and calcium oxide:
[tex]m_{CO_2}=m_{CaCO_3}-m_{CaO}\\\\m_{CO_2}=2.00g-1.12g\\\\m_{CO_2}=0.88g[/tex]
Best regards!
I will mark brainliest if all answered or if you don’t want to answer them all please just answer 9-15
Answer:
9. b
10.d
11.f
12.g
13.e
14.a
16.a
17.d
18.c
19.a
Explanation:
When hydrogen and fluorine bond, the fluorine atom's electron configuration most resembles which element? A. nitrogen B. helium C. oxygen D. neon
Answer:
D. neon.
Explanation:
Hello there!
In this case, according to the following bonding:
[tex]H-F[/tex]
It is possible to bear to mind the fact that hydrogen has one valence electron whereas fluorine has seven. Moreover, once they bond, we understand fluorine takes the only hydrogen's valence electron to attain the electron configuration of the former's contiguous noble gas which is D. neon.
Best regards!
A hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time. What type of heat transfer is this?
Answer:
convection
Explanation:
Convection is a mode of heat transfer in which the particles of a substance actually move from place to place.
During convection, warmer and less dense air rises while colder and denser air sinks downwards under gravity.
Hence; when hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time, convection has taken place.
A chef uses a large aluminum spoon with a mass of 38.0 g to stir a pot of boiling water. As a result, the spoon’s temperature increases by 3.60°C. Consider that the specific heat capacity of aluminum is 0.90 J/g–°C. How much heat has the spoon absorbed? For credit, you must show all steps of your calculations.
Answer:
12,312 J or 0.12312 kJ
Explanation:
q = mCT
q = J of heat
m = mass
C = heat capacity
T = temp change
q = 38 x 0.90 x 3.6
q = 12312 J
q = 0.12312 kJ
Create the Equation: What is the Percent Yield of Ammonia (NH3) if 11.8 g is recovered in a reaction with 7.02 x 10^23 molecules of Hydrogen gas with excess Nitrogen gas?
I REALLY NEED THE ANSWER FOR THIS PLESASE ITS DUE IN 40 MINTUES
Answer:
Explanation:
The first thing that you need to do here is to calculate the theoretical yield of the reaction, i.e. what you get if the reaction has a
100
%
yield.
The balanced chemical equation
N
2
(
g
)
+
3
H
2
(
g
)
→
2
NH
3
(
g
)
tells you that every
1
mole of nitrogen gas that takes part in the reaction will consume
3
moles of hydrogen gas and produce
1
mole of ammonia.
In your case, you know that
1
mole of nitrogen gas reacts with
1
mole of hydrogen gas. Since you don't have enough hydrogen gas to ensure that all the moles of nitrogen gas can react
what you need
3 moles H (sub 2)
>
what you have
1 mole H (sub2)
you can say that hydrogen gas will act as a limiting reagent, i.e. it will be completely consumed before all the moles of nitrogen gas will get the chance to take part in the reaction.
So, the reaction will consume
1
mole of hydrogen gas and produce
1
mole H
2
⋅
2 moles NH
3
3
moles H
2
=
0.667 moles NH
3
at
100
%
yield. This represents the reaction's theoretical yield.
Now, you know that the reaction produced
0.50
moles of ammonia. This represents the reaction's actual yield.
In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every
100
moles of ammonia that could theoretically be produced.
You know that
0.667
moles will produce
0.50
moles, so you can say that
100
moles NH
3
.
in theory
⋅
0.50 moles NH
3
.
actual
0.667
moles NH
3
.
in theory
=
75 moles NH
3
.
actual
Therefore, you can say that the reaction has a percent yield equal to
% yield = 75%
−−−−−−−−−−−−−
or 75 moles NH sub3
I'll leave the answer rounded to two sig figs.
What is the molar mass of Ca(NO3)2?
a 102.2 g/mol
b 134.1 g/mol
c O 164.1 g/mol
d 0 204.2 g/mol
Answer:
C.164.1g/mol
Explanation:
40+14×2+16×6
164
The molar mass of Ca(NO3)2 is 164.1 g/mol.
What is Calcium nitrate?
Calcium nitrate, also called Norgessalpeter (Norwegian salpeter), is an inorganic compound with the formula Ca(NO3)2(H2O)x. The anhydrous compound, which is rarely encountered, absorbs moisture from the air to give the tetrahydrate. Both anhydrous and hydrated forms are colourless salts. Calcium nitrate is mainly used as a component in fertilizers, but it has other applications. Nitrocalcite is the name for a mineral which is a hydrated calcium nitrate that forms as an efflorescence where manure contacts concrete or limestone in a dry environment as in stables or caverns. A variety of related salts are known including calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate.
Learn more about Calcium nitrate
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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
Use the drop-down menus to complete each
phrase describing voltaic cells.
Redox reactions involve a transfer of
Voltaic cells are also known as
cells.
Voltaic cells are composed of two separate
cells.
The physical material where the redox reactions
occur is called the
Answer:
electrons
galvanic
half-
electrode
Explanation:
I got it right :)
The words that complete each of the blanks in the question are;
electronsgalvanichalf-electrodeWhat is a voltaic cell?A voltaic cell is one that produces energy by a sponteanous chemical reaction. A voltaic cell is a type of electrochemical cell.
The following are the words that complete the individual blanks';
electronsgalvanichalf-electrodeLearn more about voltaic cell: https://brainly.com/question/14356798
TRUE OR FALSE? what is similar about the structure of all atoms is that they all have a nucleus made up of one or more protons and neutrons. Than electrons are located outside each nucleus
Answer:
the answer is true
Explanation:
A sample of 1.00 moles of oxygen at 50°C and 98.6 kPa, occupies what volume?
Answer:
27.22 dm³
Explanation:
Given parameters:
number of moles = 1 mole
temperature= 50°C, in K gives 50+ 273 = 323K
Pressure= 98.6kpa in ATM, gives 0.973 ATM
Solution:
Since the unknown is the volume of gas, applying the ideal gas law will be appropriate in solving this problem.
The ideal gas law is mathematically expressed as,
Pv=nRT
where P is the pressure of the gas
V is the volume
n is the number of moles
R is the gas constant
T is the temperature
Input the parameters and solve for V,
0.973 x V = 1 x 0.082 x 323
V= 27.22 dm³
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:
22.9 Liters CO(g) needed
Explanation:
2CO(g) + O₂(g) => 2CO₂(g)
? Liters 32.65g
= 32.65g/32g/mol
= 1.02 moles O₂
Rxn ratio for CO to O₂ = 2 mole CO(g) to 1 mole O₂(g)
∴moles CO(g) needed = 2 x 1.02 moles CO(g) = 2.04 moles CO(g)
Conditions of standard equation* is STP (0°C & 1atm) => 1 mole any gas occupies 22.4 Liters.
∴Volume of CO(g) = 1.02mole x 22.4Liters/mole = 22.9 Liters CO(g) needed
___________________
*Standard Equation => molecular rxn balanced to smallest whole number ratio coefficients is assumed to be at STP conditions (0°C & 1atm).
The reason salt crystals, such as KCl, hold together so well is because the cations are strongly attracted to:
a
neighboring anions.
b
free electrons in the crystals.
c
neighboring cations.
d
the protons in the neighboring nucleus.
What is the mass in grams of 3.75 × 10 21 atoms of Li?
Answer:
The mass
Explanation:
the mass grams of 3.75 × 10 21 atoms of Li is
40. 21 atom of Li
10 How does no-till farming help the environment?
A It decreases soil erosion.
C It increases fertilizer use.
B It increases soil removal.
D It decreases crop yield.
Answer: Answer is A it will decrease soil erosion
Explanation:it just will trust me
Answer:
A.
Explanation:
the soil will not loosen when u till it
Which of the following will form a metallic bond with a metal?
a
another metal
b
none of the other choices
c
semimetal
d
a nonmetal
Calculate the mass in grams of 2.56 × 10 −3 mol of iron.
Answer:
1.43 grams
Explanation:
Fe = 55.8 grams Fe = 1 mole Fe
2.56 • 10^-3 moles Fe / 1 • 55.8 grams Fe / 1 mole Fe = 1.43 grams Fe
Basically, you're just multiplying the molar mass of Fe (iron) by the moles of 2.56 • 10^-3 Fe, to find how many grams are in it.
2.56 • 10^-3 moles Fe = 1.43 grams Fe
This video allows us to see the circuit inside a flashlight. After watching the video, write notes in the space provided so that you can build the circuit in question 2.
https://app.edmentum.com/content-delivery//resource/b79af08f-5dcb-48ad-a6f5-f2c6d1e8f518
Answer:The video shows the electric circuit inside a flashlight. The battery provides power to the circuit. A metal strip is connected to the negative end of the battery. When the flashlight’s switch is pressed, the metal strip moves forward. It touches the metal connected to the bulb near the front. This motion closes the circuit, which creates a path for the electricity and causes the bulb to glow.
Explanation: plato
The electric circuit within a flashlight is powered by the battery. See below for more information.
What is a circuit?A circuit is a route that allows an electrical current to flow between two or more paths.
An electronic circuit comprises electronic components such as resistors or diodes joined by a metallic wire that conducts electricity and through which current flows.
From the video in the content;
The electric circuit within a flashlight is powered by the battery.The negative end of the battery is attached to a metal strip. There, the metal strip begins to move forward once the flashlight's switch is pressed. It comes into contact with the metal that is closely connected to the bulb close to the front. This action completes the circuit, allowing the electricity to flow and causing the bulb to light up.Learn more about the circuit here:
https://brainly.com/question/2969220
Which of the following elements has the largest atomic number?
O tellurium (Te)
lodine (0)
Otin (5)
O antimoney (5b)
Answer:
iodine is 53
tellurium is 52
antimony is 51
Otin Is 50
Explanation:
In any engineering design problem, the first step is to understand the problem and identify one or more possible solutions. In this task, you’ll analyze the problems you face as the chemical engineer challenged with setting up the ammonia-making process. Recall the chemical equation for producing ammonia:
N2 + 3H2 ⇌ 2NH3 + energy
1.Explain the problem surrounding the ammonia-making process in terms of chemical equilibrium.
Answer:
Explanation:
About 2,070 results (0.60 seconds)
Answer is: at lower temperatures the reaction rate would decrease. The lower is the temperature, the slower the reaction becomes. ... Because this is exothermic reaction (enthalpy is less than zero), at lower temperatures, the equilibrium is in favor of ammonia, but the reaction doesn't proceed at a detectable rate.
Hi,
let us go through the question again
N2 + 3H2 ⇌ 2NH3 + energy
Explain the problem surrounding the ammonia-making process in terms of chemical equilibrium.
So I would approach this question on the basis of effect of each of the reactants and products concentration on the equilibrium synthesis of ammonia.
If the concentration of any reactant is increased, the yield of ammonia is increased.
If the concentration of ammonia is reduced by removing it as it forms, the yield will as well be increased.
This reaction also yields heat meaning it is an exothermic reaction, so when we increase the temperature, the yield will be reduced. Hence it is favored by low temperature.
TRUE OR FALSE
Astronomers use spectroscopes to identify elements in stars because each element produces
unique emission spectrum
Answer:
True!
Explanation:
A spectrum is simply a chart or a graph that shows the intensity of light being emitted over a range of energies. Have you ever seen a spectrum before? Probably. Nature makes beautiful ones we call rainbows. Sunlight sent through raindrops is spread out to display its various colors (the different colors are just the way our eyes perceive radiation with slightly different energies).
Hope i helped!
an amount of 54.11 grams of pentane, c5h12 ,is equal to
francium phosphate
+ cesium acetate
Answer:
[tex]Fe_3PO_4+3Cs(CH_3COO)\rightarrow Cs_3PO_4+3Fr(CH_3COO)[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to illustrate the complete double displacement reaction between francium phosphate and cesium acetate as given on the question:
[tex]Fe_3PO_4+Cs(CH_3COO)\rightarrow Cs_3PO_4+Fr(CH_3COO)[/tex]
Which must the balanced due to the nonequal francium and cesium atoms:
[tex]Fe_3PO_4+3Cs(CH_3COO)\rightarrow Cs_3PO_4+3Fr(CH_3COO)[/tex]
Best regards!
Just a curious question to the Chemists,
If you were to 'accidentally' discover something through a chemical reaction that could change the world, what would it be and what positive impact would it have on society?
Answer:
well the world would be shocked
Explanation:
and suprise
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:
Number 12 (c) and (d) please help
Answer:
check below
Explanation:
c) Concentrated sulphuric acid is used a drying agent.
d) (use any one of them) Concentrated phosphoric acid, hot aluminium oxide, calcium chloride , anhydrous calcium sulphate
Answer:
12c) it is used as a drying agent
d) anhydrous calcium chloride
calcium oxide can also be used as a drying agent
Pt4 science......
Select correct answer ♡ !
One mole of each of these compounds is dissolved in water. Which will result in the solution with the greatest conductivity?
1. NaCl
2. Mg(CIO3)2
3. NiCiz
4. CaCl2
Answer:
1. NaCl .
Explanation:
Hello there!
In this case, it is necessary to keep in mind that just ionic compounds are able to conduct electricity and therefore, the more ionic the compound is, the more electricity it conducts. In such a way, we may be able to predict how ionic these compounds are, considering that the electronegativity increases from bottom to top and from left to right.
1. NaCl: this is the most ionic compound since it is at the leftmost group and bonded with chlorine, so this is the most conductive one.
2. Mg(CIO3)2: Mg is bonded to O, not to Cl, which makes the compound ionic but not as ionic as NaCl.
3. NiCl: Ni is more electronegative than Na and Mg, so even when this is ionic, it is not as ionic as NaCl.
4. CaCl2: This is similar to NaCl but since Ca is in group 2A, it is more electronegative than Na, which makes CaCl2 conductive but not as much as NaCl.
Best regards!
HURRY WILL GIVE BRAINLIETS How are proteins and nucleic acids related? They both provide energy. They both carry genetic information. The structure of proteins is determined by nucleic acids. The subunits of nucleic acids are also the subunits of proteins.
Answer: the answer is “C”
Explanation:
Took the T E S T