Answer:
2.74 Joules
Explanation:
The heat capacity of the metal is the amount of heat needed to raise the temperature of the metal by 1 k
heat capacity c of the sear grill = 458.5 J/K
initial temperature T1 = 292.5 K
final temperature T2 = 459.7 K
temperature change ΔT= 459.7 - 292.5 = 167.2 K
since the heat capacity is heat energy needed per degree rise in Kelvin, then the heat to raise the metal by this temperature change will be
heat required = c/ΔT = 458.5/167.2 = 2.74 Joules
City A in the Southern Hemisphere and City B in the Northern Hemisphere are located at the same latitude. Which statement is likely true about these
cities?
City B has the larger annual temperature range.
Both cities should have nearly identical winter temperatures.
City A has the larger annual temperature range.
Both cities likely have the same annual temperature range.
Answer:
City B has the larger annual temperature range
Explanation:
This is correct option because generally the northern side of the equator is high in temperature than the southern hemisphere part.
Since the southern side of the equator or Southern Hemisphere, where city A resides will generally have higher altitude or rise, so this creates higher average temperature.
How do we know that K2CrO4 and Ba(NO3)2 are not solids?
Why is acid added to water during eletrolysis
Answer:
Pure water is a non conductor of electricity and dilute acids in their aqueous solutions form free ions, which conducts electricity. Thus when we need to electrolyse water, a dilute acid is added to increase its conductivity.
Para mejorar la combustión de la gasolina sin plomo se utiliza metanol ( CH3OH ) como aditivo, el cual reduce las emisiones nocivas de los vehículos. Calcular la cantidad de mililitros de agua ( densidad = 1 g/mL ) que se necesitan para preparar una disolución 4.12 molal, con 56.07 gramos de metanol.
Answer:
V = 426.76 mL
Explanation:
Para realizar este ejercicio, necesitas aplicar la siguiente expresion:
m = moles soluto / kg solvente (1)
donde:
m: molalidad.
Ahora bien, tenemos la molalidad de la solución la cual es 4.12 m y la masa de metanol que es 56.07 g. Obviamente, el agua es un solvente universal, por lo tanto en esta disolución, el soluto es el metanol y el solvente el agua.
Sabiendo eso, necesitamos ahora calcular los moles de soluto. Para ello usamos la siguiente expresión:
moles = masa / PM (2)
El peso molecular, es la suma de todos los pesos atómicos involucrados en el compuesto. En el caso del metanol que es CH3OH, los pesos atómicos son:
C = 12 g/mol; H = 1 g/mol ; O = 16 g/mol
Calculemos entonces el peso molecular:
PM = 12 + (4*1) + 16 = 32 g/mol
Con este valor, podemos calcular los moles de metanol o soluto:
moles = 56.07 / 32
moles soluto = 1.75 moles de metanol
Ahora usamos la expresión (1), para despejar los kg de solvente y quedaría:
kg solvente = moles soluto / m (3)
Reemplazamos los valores obtenidos y calculamos la masa de solvente en kilogramos:
kg agua = 1.75 / 4.12
kg agua = 0.42476 kg
Si este valor lo llevamos a gramos, que es simplemente multiplicar por 1000 o correr la coma 3 espacios a la derecha, tenemos:
masa de agua = 0.42476 * 1000 = 424.76 g
Finalmente, si la densidad del agua es 1 g/mL significa que el volumen de agua es igual a la masa de agua, por lo tanto
V = 426.76 mLY esta es la cantidad en mililitros de agua que se necesitan para preparar esta disolución con esa concentración.
Differentiate between thermoplastic and thermosetting plastic. Give two examples of each.
Answer:
though thermoset plastics and thermoplastics sound similar, they have very different properties and applications... the primary physical difference Is that thermoplastics can be remelted back into a liquid , whereas thermose plastics alwas remain in a permanent solid state
A) Cu2+ + Bu?
Chemical Formula =
CuBuz
(Need 2 anions and 1 cation)
B) Fe2+
+02
Chemical Formula =
Feo
(Need 1 of each)
C) Fe3+ + Brl-
Chemical Formula =
(Need 3 anions and 1 cation)
D) Kl+ + S2-
Chemical Formula =
(Need 1 anion and 2 cations)
E) Ba2+ + O2-
Chemical Formula =
(Need 1 of each)
(Need 3 anions and 2 cations)
Fe2(SO3)3
(Need 1 anion and 2 cations)
(Need 1 of each)
(Need 1 anion and 2 cations)
F) Cr3+ + O2
Chemical Formula =
G) Fe3+ + (SO3)2- Chemical Formula =
H) Ca2+ + (SO3)2- Chemical Formula =
1) (NH2)++ +52- Chemical Formula =
) Mg2+ + Cl2 Chemical Formula =
K) AM+ +52
Chemical Formula =
L) Na+ + (CO3)2+ Chemical Formula =
M) Ba2+ + (PO4)3- Chemical Formula =
Answer:
I and K cannot be intepreted. I think theres something wrong in the scanning. Besides that i hope this helps
2KMnO4= K2MnO4+ MnO2+O2 how many grams of KMnO4 are required to produce 1.60 grams of O2
Answer: 15.8 g of [tex]KMnO_4[/tex] will be required to produce 1.60 grams of [tex]O_2[/tex]
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} O_2=\frac{1.60g}{32g/mol}=0.05moles[/tex]
[tex]2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2[/tex]
According to stoichiometry :
As 1 mole of [tex]O_2[/tex] is given by = 2 moles of [tex]KMnO_4[/tex]
Thus 0.05 moles of [tex]O_2[/tex] is given by =[tex]\frac{2}{1}\times 0.05=0.10moles[/tex] of [tex]KMnO_4[/tex]
Mass of [tex]KMnO_4=moles\times {\text {Molar mass}}=0.10moles\times 158g/mol=15.8g[/tex]
Thus 15.8 g of [tex]KMnO_4[/tex] will be required to produce 1.60 grams of [tex]O_2[/tex]
How do wetlands form?
Wetlands form where water and land meet. These may be glacial potholes, or old lake beds where water is semi-permanent, being wet in the rainy season and dry the rest of the year. They may be at the fringe of permanent bodies of water. They may be low lying places that fill with water when the water table rises.
Wetlands change over time. A lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. A pond can fill in to become a bog or fen. Sediment can fill in a river marsh to become a swamp. A flood can scour out soil and turn a marsh into open water.
definition of wetlands, characteristics of wetlands, types of wetlands, change over time, functions of wetlands, man-made wetlands,project
Explanation:No explanation plz give me brainiest
The major difference between a 1s orbital and a 2s orbital is that
The 2s orbital has a slightly different shape.
The 2s orbital is at a higher energy level.
The 2s orbital can hold more electrons.
The 1s orbital can have only one electron.
Answer:
The 2s orbital is at a higher energy level.
Explanation:
1s and 2s are present in the s sub-orbital which surrounds the nucleus. The s sub-orbital has a spherical shape. As per the level of the energy, the sub-orbitals are numbered as 1s, 2s, 3s, 4s, etc. respectively. The difference among the sub-orbitals is based on their level of energy. 1s has less energy level than 2s. The radius of 2s is more than 1s.
En un experimento hacemos reaccionar a una solución de acido cloridico con el metal cinc. Para ello, hemos usado, 6,5g de cinc y gas hidrogeno. ¿Cual es la masa de gas obtenida? Urgente es para un examen
Answer:
0.200g de gas son obtenidos
Explanation:
La reacción de ácido clorhídrico, HCl, con Zn es:
2HCl(aq) + Zn(s) → ZnCl₂(s) + H₂(g)
Donde 2 moles de ácido reaccionan con 1 mol de Zn para producir una mol de cloruro de cinc y una mol de hidrógeno (gas)
Asumiendo que el ácido está en exceso, las moles de 6.5g de Zn (Masa molar: 65.38g/mol) son:
6.5g × (1mol / 65.38g) = 0.0994 moles de Zn
Como 1 mol de Zn produce 1 mol de hidrógeno, las moles de hidrógeno son 0.0994 moles de H₂. En gramos (Masa molar H₂ = 2.01g/mol):
0.0994 moles H₂× (2.01g / mol) = 0.200g de gas son obtenidos
According to the Law of the Conservation of Matter, if you dissolve 25 grams of sugar into 150 grams of water, the mixture should weigh how much?
Answer:
According to the law of conservation of matter, the mixture should weigh 175 g
Explanation:
The law of conservation of matter is one of the basic guiding principles of chemical reactions.
It states that matter is neither created nor destroyed but can be converted from one form to another.
Although this law has been faulted with advances in science and technology, it is still found basically useful.
So applying the law to the question at hand, it is expected that all the mass of the sugar gets added to all the mass of the water
This brings the total mass to 25 + 150 = 175 grams
The weight of the mixture of sugar and water has been 175 grams.
The law of conservation of mass has been based on the fact that the mass has neither been created and nor destroyed.
The law of conservation of mass stated the combination of the two compounds results in the final solution being the sum of the two reactants.
For example, the mass of a solution of compounds A and B will be:
Mass of A + Mass of B = Mass of solution
The sugar solution formed has been consisted of:
Sugar = 25 grams
Water = 150 grams.
According to the law of conservation of mass, the weight of the mixture has been:
Weight of mixture = Weight of sugar + Weight of water
Weight of mixture = 25 grams + 150 grams
Weight of mixture = 175 grams.
The weight of the mixture of sugar and water has been 175 grams.
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What does the electronegativity of an atom indicate?
O A. The energy required to gain or lose an electron
O B. The tendency of the atom to pull on electrons
O c. The measurement of the charge of an ion
O D. The effect the valence electrons have on core electrons
Answer:
b) the tendency of the atom to pull on electrons
Explanation:
a p e x
B. The tendency of the atom to pull on electrons. The electronegativity of an atom indicates its tendency to attract and pull electrons towards itself when it is part of a chemical bond.
It gauges how well an atom can draw and hold onto electrons in a chemical connection. In the periodic chart, electronegativity rises over a period (from left to right) and falls within a group (from top to bottom).
In a covalent bond, atoms with high electronegativity pull the shared electrons closer to their nucleus due to their higher attraction to electrons. The pull for electrons is weaker for atoms with low electronegativity, and thus are more prone to shed electrons to create positive ions during ionic bonding.
The difference in electronegativity between the two atoms in a bond also influences the kind of bond that is created. A strong difference in electronegativity will likely result in the formation of an ionic bond.
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the definition of volume is ?
a) width*height
b) the space occupied by mass
c) the space occupied by a liquid
d) the mass of liquid required to fill a container
Answer:
D
Explanation:
Volume is the amount of cubic units required to fill a container.Or in other words,the mass of liquid required to fill a container.
1. X is a crystalline salt.On exposure to air ,there is a loss in mass of x (a)suggest a phenomenon exhibited by x. (b)mention 2 salts that x could be. 2 a)Define salt hydrolysis b)mention 2 examples of salts that produce alkaline solutions when dissolve in water.
Answer:
1. a) Crystalline hydrated salt lose their mass or moisture on exposure to the air and change into amorphous salt, the phenomenon is called efflorescence.
b) Two salts that x could be are gypsum (Caso4.H2O) and copper (II) sulfate (CuSO4.H2O).
Gypsum (Caso4.H2O) form anhydrite(CaSO4), when exposed to air and copper (II) sulfate (CuSO4.H2O) form a white layer of anhydrous copper (II) Sulfate when expose to sir.
2. a) Salt hydrolysis is defined as the ions from salts react with water and form either basic or an acidic solution.
b) Two examples of salts that produce alkaline solutions when dissolving in water are sodium bicarbonate (NaHCO3) and Calcium Carbonate (CaCO3).
In an experiment, dilute hydrochloric acid reacts with a white solid and bubbles of gas are produced. If this gas is bubbled through limewater, the limewater turns milky. What is the gas that is produced? Give the name, not the symbols.
Answer:
Explanation:
Carbon dioxide reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
Hope this helps you
What is the final pH value of the solution at the end of the titration between strong acids and bases? Explain why that happens.
Answer:
pH of 7 (neutral)
Explanation:
At end of titration or equivalence point (point where you have added equal molar amounts of acids and bases) , the pH is 7.0 because the solution only contains water and a salt (which is a main characteristic of acid and base titrations/reactions).
The reason we only have water and salt is because H+ from acids neutralize OH- molecules in the solution, making water (which is neutral) and the salt does not affect the pH.
Since at equivalence point nor H+ or OH- reigns supreme (that is both are at equal molarity/concentration) the pH is neutral. The pH would be acidic or basic depending on if H+ was high or low, but here H+ is equal with OH- thus pH is neutral.
State four steps that we can take to protect our environment from plastic-related pollution.
Answer:
(1) wean yourself of disposable plastics. and(2) stop
buing water
They say that the sun will blow up after 200 billion years.
IS THIS True or false?
MARKING BRAINLIST
Answer:
True
Explanation:
Because the sun is a star, all stars eventually explode after a certain amount of time
Answer:
True
Explanation:
The sun will become a red giant and increase in size. During that time, the earth will increase in 1 degree each day making it inhabitable to live
Which of the following is not sublimable?
Dry ice
Calcium chloride
Ammonium chloride
Answer:
Calcium chloride
Explanation:
Sublimation is the process whereby a solid substance is converted to gas when heat is applied. Solid normally gets converted to the liquid phase before reaching the gaseous phase but these substances gets converted from solid straight to gas
Solid—> Gas
Dry ice( solid CO2) and Ammonium chloride undergo sublimation while Calcium chloride doesn't.
Ammonium chloride
These are the questions
Answer:
3) 1
4) 0.2
5) 2
6) 1
7) 0.2
Explanation:
3)
The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.
4)
CO2 has a molar mass of just about 44 grams, meaning that 44 grams of it would be about a mole. 5000mL of solution is 5 liters, meaning that the molarity of this solution would be 1/5=0.2.
5)
HF has a molar mass of about 20, meaning that 20 grams of it is about a mole. 1/0.5=2M.
6)
Calcium flouride has a molar mass of about 78 grams, meaning that 156 grams is about two moles. 2000mL is 2 liters, meaning that this has a molarity of 2/2=1.
7)
Glucose has a molar mass of about 180 grams, meaning that 360 grams of it would be about 2 moles. 2/10=0.2.
Hope this helps!
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88w88 *what have I caught here?
If you travel southeast from one city to another city that is 314 km away, and the trip takes you 4.0 hours, what is your average velocity?
Answer:
v = 78.5 km/h
Explanation:
It is given that, the distance between one city to another is 314 km. The overall trip takes 4 hours. We need ton find average velocity. It is equal to the total displacement divided by total time taken. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{314\ km}{4\ h}\\\\v=78.5\ km/h[/tex]
So, average velocity is 78.5 km/h.
Why are elements in the tall columns of the periodic table called
"representative elements"?
A. They all have the same number of isotopes.
B. They represent the elements on Mendeleev's table.
C. They follow a pattern for valence electrons.
D. They all share the same chemical properties.
Answer:
The answer is C.They follow a pattern for valence electrons.
Explanation:
I did A P E X quiz.
The elements in the tall columns of the periodic table called "representative elements" because they follow a pattern for valence electrons. Therefore option C is correct.
The tall columns in the periodic table are known as groups or families. The elements within each group exhibit similar chemical behavior and share certain characteristics.
The elements in these groups are often referred to as "representative elements" because they represent or exemplify the general properties and trends of their respective groups. One of the key patterns observed among the representative elements is their valence electrons.
In the representative elements, the number of valence electrons follows a predictable pattern within each group.
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A solution has a [H] of 1.0 x 107 M. Calculate the pH.
ANSWER Since 1.0 × 10 -7 has two significant figures, the pH can be reported as 7.00. A logarithmic scale condenses the range of acidity to numbers that are easy to use. Consider a solution with [H + ] = 1.0 × 10 -4 M. That is a hydrogen-ion concentration that is 1000 times higher than the concentration in pure water.
Water is a universal solvent because it can be a solid, liquid, or a gas True or false
What does atmosphere mean?
Answer:
Atmosphere refers to the gases surrounding a star or planetary body held in place by gravity. A body is more likely to retain an atmosphere over time if gravity is high and the temperature of the atmosphere is low.
Answer:
atmosphere- the gaseous mass or surrounding a celestial body, especially the one surrounding the earth, and retained by the celestial body's gravitational field, or surrounding area
Hope this helps :)
A 300 gram sample of pure water exerts a vapor pressure of 740 millimeters of mercury on the walls of its container. If 0.4 00 moles of glucose (C6H12O6) is added to the water, what will be the vapor pressure of the resulting solution?
723 mm Hg
738 mm Hg
739 mm Hg
743 mm Hg
The equation,P(solution) = X(solvent * P(solvent), can be used to determine vapor pressure lowering. 300 grams of water is 300g x 1 mole/18.0g = 16.67 moles water. Thus, X = 16.67 moles water/17.07 moles total = 0.977 and the new pressure = 0.977 x 740 mm Hg = 723 mm Hg.
90 grams of glucose, C6H12O6, is dissolved in 2 liters of solution. Determine the molarity (M).
Answer:
0.25
Explanation:
The first step is to determine how many moles of glucose there are, which means first finding out the molar mass of glucose. Carbon has a molar mass of about 12, hydrogen 1, and oxygen 16, so the total molar mass of glucose is about 6(12)+12(1)+6(16)=180 grams. This means that 90 grams is half a mole. Half a mole of substance divided by two liters of solution is (1/2)/2=1/4, or a molarity of 0.25. Hope this helps!
choose the correct structural formula for the alcohol formed in this reaction
Answer:
The formula is CnH2n+1OH
Explanation:
Chlorine gas has a pressure of 1.05 atm at 25°C. What pressure will it exert at 75°C?
Answer:
It will exert a pressure of 1.23 atm
Explanation:
To calculate the pressure it will exert, we shall be using the Gay Lussac pressure law
Here, we know that pressure and volume are inversely proportional.
Mathematically:
P1/T1 = P2/T2
From the question, P1 = 1.05 atm
P2 = ?
T1 = 25 which when converted to Kelvin scale will be 25 + 273 = 298
T2 = 75 + 273 = 348
Plugging these values, we have;
1.05/298 = P2/348
= P2 = (348 * 1.05)/ 298 = 1.226 which is approximately 1.23 atm
Which human job is most similar to the role of a producer?
Answer:
Teaching
Explanation:
Teaching or tutoring is a type of human job that gives strength to other individuals by impacting them with the necessary knowledge or skills they required to survive in life.
Teachers or tutors are the people that carry out this task.
It should be understood that the most important thing that people need to survive in life is information. And when they are given the information they will do exploit.
The options, which are missing from this question are:
Business entrepreneurEnergy plant workerWaste management specialistRestaurant criticThe job of an energy plant worker is similar to the role of a producer.
WHAT A PRODUCER DOES:
A producer is an organism that is capable of synthesizing its own food either by using sunlight or chemicals. Producers are the pioneer organisms of an energy flow between organisms. This is because they produce the source of energy that is transferred from one organism to the other. Likewise, an energy plant worker is an individual (human) that works in a factory where energy is produced and transferred to other forms.Therefore, the job of an energy plant worker is similar to the role of a producer.
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