Answer:
Explanation:
Energy needed = mass * temperature difference * specific heat
= 4.37 * (27.5-25) * 0.24
= 4.37 * 2.5 * 0.24
= 2.622J
Answer:
Explanation:
warm up 2.5C
mass 4.37
specific heat 0.24
energy = 2.5*4.37*0.24
= 2.6J
An element X has the proton number 18.
The next element in the periodic table is an element Y.
Which statement is correct?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, the element X with the atomic number of 18 is Argon (Ar) while the next element (element Y) in the periodic table, with atomic number 19, is potassium (K).
Element X is found in the group zero (also called group 18 and elements found therewith are referred to as noble gases) of the periodic table while element Y is found in group 1 (elements found here are referred to as alkali metals).
Element X has a completely filled outermost shell while element Y has one electron in its outermost shell.
Element X is a metal while element Y is a nonmetal.
The reaction below is performed with 10.0 g of Al and 19.0 g of O2. How many grams of aluminum oxide will be made? 4 Al (s) + 3 O2 (g) → 2 Al2O3 (s)
Answer:
18.89 g of Al₂O₃.
Explanation:
The balanced equation for the reaction is given below:
4Al + 3O₂ —> 2Al₂O₃
Next, we shall determine the masses of Al and O₂ that reacted and the mass of Al₂O₃ produced from the balanced equation. This can be obtained as follow:
Molar mass of Al = 27 g/mol
Mass of Al from the balanced equation = 4 × 27 = 108 g
Molar mass of O₂ = 16 × 2 = 32 g/mol
Mass of O₂ from the balanced = 3 × 32
= 96 g
Molar mass of Al₂O₃ = (27×2) + (16×3)
= 54 + 48
= 102 g/mol
Mass of Al₂O₃ from the balanced equation = 2 × 102 = 204 g
SUMMARY:
From the balanced equation above,
108 g of Al reacted with 96 g of O₂ to produce 204 g of Al₂O₃.
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above,
108 g of Al reacted with 96 g of O₂.
Therefore, 10 g of Al will react with
= (10 × 96)/108 = 8.89 g of O₂.
From the calculation made above, we can see clearly that only 8.89 g out of 19 g of O₂ given, reacted completely with 10 g of Al.
Therefore, Al is the limiting reactant and O₂ is the excess reactant.
Finally, we shall determine the mass of aluminium oxide, Al₂O₃, produced from the reaction.
NOTE: in this case, the limiting reactant will be used because it will give the maximum mass of the aluminium oxide, Al₂O₃ as all of it is consumed in the reaction.
Al is the limiting reactant and the mass of aluminium oxide, Al₂O₃ produced can be obtained as follow:
From the balanced equation above,
108 g of Al reacted to produce 204 g of Al₂O₃.
Therefore, 10 g of Al will react to produce = (10 × 204)/108 = 18.89 g of Al₂O₃.
Thus, 18.89 g of Al₂O₃ were obtained from the reaction.
Look at the picture below. If the total mass of the reactants is 74, what will the total mass of the products be?
Answer:
74
Explanation:
The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products
hope this helps!
The total mass of the products will also be 74 g
The law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.From the above law, we understood that in any chemical reaction, the total mass of reactants must be equal to the total mass of products i.e
Total mass of reactants = Total mass of productsFrom the question given above,
Total mass of reactants = 74 g
Total mass of products =?Total mass of reactants = Total mass of products
74 g = Total mass of products
Thus,
Total mass of products = 74 gTherefore, we can conclude that if the total mass of reactants is 74 g, then the total mass of products will also be 74 g.Learn more: https://brainly.com/question/13410855
I.
Look at the pictures below. What can you say about them?
Describe their similarities and differences. Write your answer in
your notebook
Www
cowo
Politics
SXO
is
Answer:
Hey , I can't see the picture
Which part of the Earth system contains most of the planet's mass?
Answer:
Geosphere of the Earth system contains most of the planet's mass.
Explanation:
One of the most important is the Carbon Cycle since all of the organisms on Earth are carbon-based life forms. includes all water on the surface of the earth oceans, lakes, rivers, aquifers, and ice. 70% of the earth's surface is covered with water.
Produces helium, a safe noble gas
O Fission
O Fusion
Answer:
Nuclear fission power plants have the disadvantage of generating unstable nuclei; some of these are radioactive for millions of years. Fusion on the other hand does not create any long-lived radioactive nuclear waste. A fusion reactor produces helium, which is an inert gas.
When heat is applied to 80 grams of CaCO3, it yields 39 grams of CO2. Determine
the percentage of the yield.
Answer: The percentage yield of [tex]CO_2[/tex] is 90.26%.
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of [tex]CaCO_3[/tex] = 80 g
Molar mass of [tex]CaCO_3[/tex] = 100 g/mol
Plugging values in equation 1:
[tex]\text{Moles of }CaCO_3=\frac{80g}{100g/mol}=0.8 mol[/tex]
For the given chemical equation:
[tex]CaCO_3\rightarow CaO+CO_2[/tex]
By the stoichiometry of the reaction:
If 1 mole of [tex]CaCO_3[/tex] produces 1 mole of [tex]CO_2[/tex]
So, 0.8 moles of [tex]CaCO_3[/tex] will produce = [tex]\frac{1}{1}\times 0.8=0.8mol[/tex] of [tex]CO_2[/tex]
Molar mass of [tex]CO_2[/tex] = 44 g/mol
Plugging values in equation 1:
[tex]\text{Mass of }CO_2=(0.8mol\times 44g/mol)=35.2g[/tex]
The percent yield of a reaction is calculated by using an equation:
[tex]\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100[/tex] ......(2)
Given values:
Actual value of [tex]CO_2[/tex] = 35.2 g
Theoretical value of [tex]H_2CO_3[/tex] = 39 g
Plugging values in equation 2:
[tex]\% \text{yield of }CO_2=\frac{35.2g}{39g}\times 100\\\\\% \text{yield of }CO_2=90.26\%[/tex]
Hence, the percentage yield of [tex]CO_2[/tex] is 90.26%.
How many grams of H20 are produced from the reaction of 30.0g of Mg(OH)2 reacting with
HCI?
Mg(OH)2 + 2HCl --> 2H20 + MgCl2
Answer: The mass of water required is 18.52 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of magnesium hydroxide = 30.0 g
Molar mass of magnesium hydroxide = 58.32 g/mol
Plugging values in equation 1:
[tex]\text{Moles of magnesium hydroxide}=\frac{30.0g}{58.32g/mol}=0.5144 mol[/tex]
The given chemical equation follows:
[tex]Mg(OH)_2+2HCl\rightarrow MgCl_2+2H_2O[/tex]
By the stoichiometry of the reaction:
If 1 mole of magnesium hydroxide produces 2 moles of water
So, 0.5144 moles of magnesium hydroxide will react with = [tex]\frac{2}{1}\times 0.5144=1.0288mol[/tex] of water
Molar mass of water = 18 g/mol
Plugging values in equation 1:
[tex]\text{Mass of water}=(1.0288mol\times 18g/mol)=18.52g[/tex]
Hence, the mass of water required is 18.52 g
What is the molecular geometry of Br2
is para-dichlorobenzene an ionic, covalent or metallic bond?
I think there are a bond??
Answer:
it is covalent
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What does a prism do?
A. It changes the wavelengths contained in a beam of light.
B. It combines wavelengths to make white light.
C. It removes specific wavelengths from a beam of light.
O D. It separates the wavelengths contained in a beam of light.
Answer:
D
the angles wich light is coming into the medium are not the same for all wavelengths (colors, at least in the visible spectrum). same for outgoing light.
the same it true for any transparent barrier between two different materials, like air and water.
A prism separates the wavelengths contained in a beam of light. Hence Option (D) is correct.
What is Prism ?A glass or other transparent object in the form of a prism, especially one that is triangular with refracting surfaces at an acute angle with each other and that separates white light into a spectrum of colours.
A prism is an optical component that serves one of two major functions: it disperses light, or it modifies the direction (and sometimes polarization) of light.
In some cases, a prism has more than one function. Prisms are usually transparent to the region of the electromagnetic spectrum being observed.
The prisms are employed to produce polarized light for optical instruments such as microscopes and polarimeters.
Mirrors are commonly utilized to fold the light beam through an optical system.
Therefore, A prism separates the wavelengths contained in a beam of light. Hence Option (D) is correct.
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Biggest oil fields in the world?
Answer:
Ghawar field location-Saudi Arabia
Burgan Field location-Kuwait
Ahvaz field location-Iran
Upper Zakum Oil Field Location-Abu Dhabi UAE
Explanation:
I learned this yesterday :D
Concentrations-
How many moles of HCI are present in 562.0 ml of a 6.17 M HCI solution?
If possible, show work.
Identify the atom oxidized, the atom reduced, the oxidizing agent, and the reducing agent. 2Fe + 3V2O3 -------> Fe2O3 + 6VO
Explanation:
Fe- reducing agent (since it is oxidized to fe203)
v203- oxidizing agent(since it is reduced)
In the given reaction, Fe is the reducing agent and V is the oxidizing agent.
What is a reducing agent?An atom or compound that loses its electrons to other substances in a reduction-oxidation reaction and gets oxidized to a higher valency state is called a reducing agent.
A reducing agent can be defined as one of the reactants of a redox reaction that reduces the other reactant by giving its electrons to the reactant. If the reducing agent can not give away its electrons to others in a reaction, then the reduction reaction cannot occur.
Given, the following chemical reaction:
2Fe + 3V₂O₃ → Fe₂O₃ + 6VO
The V₂O₃ oxidation state of V:
2 x + 3(-2) = 0
2x = 6
x = + 3
The Fe₂O₃ oxidation state of Fe:
2 y + 3 (-2) = 0
2y = 6
y = + 3
The V acts as an oxidizing agent because it accepts one electron to change the oxidation state from +3 to +2.
Fe acts as a reducing agent because it gives out its electrons to change the oxidation state from 0 to +3.
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round 5,239 to 2 significant figures
Answer:
5240
Explanation:
I'm not sure tho sorry
what is indepent and dependent variables
Answer:
The independent variable is the cause. Its value is independent of other variables in your study.
The dependent variable is the effect. Its value depends on changes in the independent variable.
Ex: The ice cube melts on the stove.
Dependent variable: Ice Cube
Independent variable: heat of stove
Answer:
In an experiment, the IV(independent variable) is a variable that is changed to see how it affects something else, and the DV (dependent variable)is a variable that is being measured/observed.
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4. Completa el texto con las siguientes palabras del listado. La contaminación por ? Es una alteración ? Que destruye la vegetación, ? Y el suelo y afecta el ? , es el resultado de la quema de ? Y gases industriales nocivos.
Answer:
Actividades humanas y vida marina.
Explicación:
La contaminación ocurre por actividades humanas que se considera una alteración en el medio ambiente. Esta contaminación provocada por el ser humano puede destruir la vegetación, el suelo y afectar negativamente a la vida marina. Esta destrucción que se produce en el medio ambiente es el resultado de la quema de combustibles fósiles que liberan gases industriales nocivos en la atmósfera por lo que si queremos proteger nuestro medio ambiente de mayores daños tenemos que reducir las actividades que provocan la liberación de gases nocivos en la atmósfera. .
The complete balanced equation for the reaction between barium hydroxide and acetic
acid is
Answer:
2 CH3COOH + Ba(OH)2 --> Ba(C2H3O2)2 + 2H2O
To make it less clustered, you can use Ac for C2H3O2.
2 HAc + Ba(OH)2 --> Ba(Ac)2 + 2H2O
The acetic acid reacts with the base barium hydroxide to form the salt barium acetate and water.
Explanation:
final answer. C
Please help down below I'll give brainliest
Answer: plastic conduces heat
Explanation:Plastics are excellent insulators, meaning they can efficiently trap heat — a quality that can be an advantage in something like a coffee cup sleeve. ... The new polymers, which are lightweight and flexible, can conduct 10 times as much heat as most commercially used polymers
The electrolysis of water has the equation 2H2O (l) → 2H2 (g) + O2 (g). What type of reaction is this?
A)
Single displacement
B)
Double displacement
C)
Decomposition
D)
Synthesis
Answer:b
Explanation:
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REACTION TYPE:
Single displacement/Oxidation-reduction
(Hope this helped UwU)
Answer:
Synthesis reaction is the answer
describe how water molecules can hydrate various substances
Answer:
A water molecule can react with the carbonyl group of an aldehyde or a ketone to form a substance known as a carbonyl hydrate, as shown in the first reaction below. The carbonyl hydrates usually form a very small percentage of the molecules in a sample of a specific aldehyde or ketone.
(Nice profile pic also UwU)
After severe dust storms in the 1930s, practices were put in place to reduce soil erosion. Which
practice best helped to reduce soil erosion?
Answer:
keep the soil wet
Explanation: if the song wet it will not cause as much dust storms
During nuclear fission and fusion, what is matter that seems to disappear actually converted into?
mass
energy
volume
nuclei
The two general types of air pollution are _____ and _____.
invisible
particles
gases
liquid
Answer:
i think this is it
Explanation:
particles and gases
Which do you think has more mass, 1 mole of fructose, 1 mole of sucrose or 1 mole of aspartame? Explain your reasoning.
Answer:
i think they would be all the same
Explanation:
they sound like sugars
can someone check if i did this right. thank you !!
Answer:
noo
Explanation:
its basic
....................
Answer: acidic
Explanation:
Dãy các chất tác dụng với nước ở nhiệt độ thường là
A. SO2, BaO, Mg.
B. Na2O, P2O5, K.
C. SO3, BaO, Fe.
D. CaO, BaO, Fe
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(PLEASE HELP 20 POINTS)
4.2 moles of an unknown gas at a pressure of 5.5 atm has a volume of 12.0 L.
What is the temperature?
Answer: The temperature of the unknown gas is 191.4 K.
Explanation:
To calculate the temperature of the gas, we use ideal gas equation which is given as:
[tex]PV=nRT[/tex] .......(1)
Where
P = pressure of the gas = 5.5 atm
V = volume of gas = 12.0 L
n = number of moles = 4.2 moles
R = Gas constant = 0.0821 L.atm/mol.K
T = temperature of the gas = ?
Putting values in equation 1:
[tex]5.5atm\times 12.0L=4.2mol\times 0.0821L.atm/mol.K\times T\\\\T=\frac{5.5atm\times 12.0L}{4.2mol\times 0.0821L.atm/mol.K}\\\\T=191.4K[/tex]
Hence, the temperature of the unknown gas is 191.4 K.
