Answer:
A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.
Explanation:
help help
What are the cells that respond to stimuli called?
Answer:
receptors which detect stimuli changes in the environment
Explanation:
Which best illustrates the way in which radiation transfers thermal energy?
A red ball at left labeled warm does not touch a blue ball labeled cool at right. Curved arrows point from the blue ball to the red ball.
A red ball at left labeled warm does not touch a blue ball labeled cool at right. Curved arrows point from the red ball to the blue ball.
A red ball at left labeled warm touches a blue ball labeled cool at right. Straight arrows point from the blue ball to the red ball.
A red ball at left labeled warm touches a blue ball labeled cool at right. Straight arrows point from the red ball to the blue ball.
Answer:
B or the second answer.
Explanation:
It's heat transfer and the objects aren't directly touching. B is the only answer that fits.
Hope this helps!
Answer:
b
Explanation:
which two locations have climate warmed by the gulf streams please help
Answer:
A and C
Explanation:
Hope this helps :)
Answer:
I think B and C hope this helps!
Explanation:
A 0.0795-g sample of magnesium metal reacts with hydrochloric acid to give 88.5 mL of hydrogen gas at 25 degree C and 766 mm Hg.
Required:
a. Calculate the moles of hydrogen gas produced.
b. Calculate the molar volume of hydrogen gas at STP.
c. What are major sources of experimental error?
Answer:
(a). 0.0037 mol.
(b). 22.42 L
(c). => When the measuring apparatus are not precise.
=> Error due to parallax.
=> Random errors.
Explanation:
Without mincing words let us dive straight into the solution to the question above. So, we are given the following parameters or information which are going to aid in solving this particular Question;
Mass of magnesium given= 0.0795 g, volume of Hydrogen = 88.5 mL = 0.0885 L, temperature = 25 degree C = 273 + 25 = 298K and pressure = 766 mm Hg = 766/760 = 1.00789 atm.
(a). In order to determine the number of moles of Hydrogen atoms,we will be making use of the formula below;
Number of moles = (pressure × Volume)/ gas constant,R × Temperature.
Thus,the number of moles of Hydrogen = 1.00789 × 0.0885 / [( 0.08206 × 298] = 0.0037 mol.
(b). The molar volume at stp can be calculated by using the same formula that was used in (a) above;
Molar Volume at stp = Gas constant,R × temperature/ Pressure = 0.08206 × 273 / 1 atm = 22.42 L.
(c). The major sources of errors are given below:
=> When the measuring apparatus are not precise.
=> Error due to parallax.
=> Random errors.
A large balloon contains 5400 m3 of He gas that is kept at a temperature of 280 K and an absolute pressure of 1.10 x 105 Pa. Find the mass of He inside the balloon. (Molar mass of He : 4.002 g/mol)
Answer:
1.02 × 10⁶ g
Explanation:
Step 1: Given data
Volume of the balloon (V): 5400 m³Temperature (T): 280 KAbsolute pressure (P): 1.10 × 10⁵ PaMolar mass of He (M): 4.002 g/molStep 2: Convert "V" to L
We will use the conversion factor 1 m³ = 1000 L.
5400 m³ × 1000 L/1 m³ = 5.400 × 10⁶ L
Step 3: Convert "P" to atm
We will use the conversion factor 1 atm = 101325 Pa.
1.10 × 10⁵ Pa × 1 atm / 101325 Pa = 1.09 atm
Step 4: Calculate the moles of He (n)
We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 1.09 atm × 5.400 × 10⁶ L / 0.08206 atm.L/mol.K × 280 K
n = 2.56 × 10⁵ mol
Step 5: Calculate the mass of He (m)
We will use the following expression.
m = n × M
m = 2.56 × 10⁵ mol × 4.002 g/mol
m = 1.02 × 10⁶ g
which option is an element
A student has 2 rubber balls of the same size and weight. Ball A is still and Ball B is rolling.Ball B hits Ball A, and Ball A start moving. Why does Ball A start moving?
Answer:
It starts to move because of Newtons first law "An object will not change it's motion unless a force acts on it"
Explanation:
Meaning ball B is that force acting upon ball A
Ammonium phosphate is an important ingredient in many solid fertilizers. It can be made by reacting aqueous phosphoric acid with liquid ammonia. Calculate the moles of ammonia needed to produce of ammonium phosphate. Be sure your answer has a unit symbol, if necessary, and round it to significant digits.
Answer:
The balanced chemical equation:
3 NH₃ + H₃PO₄ → (NH₄)₃PO₄
From the equation we see:
3 moles of NH₃ gives 1 mole (NH₄)₃PO₄
0.085 mole NH₃ will gives ?? mole (NH₄)₃PO₄
By cross multiplication:
number of moles of (NH₄)₃PO₄ = 0.085 * 1/3 = 0.028 mole
Explanation:
Which property of gases is explained by the process of diffusion?
A.
their ability to compress under high temperature
B.
their ability to expand under low temperature
C.
their ability to expand under pressure
D
their ability to fill the available volume of a container
Answer:
The appropriate alternative is "Option D".
Explanation:
Diffusion would be a random or physical phenomenon that corresponds to that same transfer budget of molecules from some kind of highly concentrated area to something like a lower one. The substance which diffuses may be strong, liquids, and gaseous. Correspondingly, the framework where certain diffusion happens can however be amongst the three aspects of sustainability.All those other options aren't relevant to the situation in question. So the above alternative becomes the right one.
if the Chemical Reaction bellow started out with a total mass of 45 grams, what would be the total mass of the products?
2Na + 2H2O ---> 2 NA OH + H2
Answer:
When 45 gram of total mass of reactant react 45 gram of product will also produced
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
In a similar way,
2Na + 2H₂O → 2NaOH + H₂
45 g = 45 g
when 45 gram of total mass of reactant react 45 gram of product will also produced. (2NaOH + H₂ = 45 g)
even about the food chain is correct?
Answer:
its C, because the cocunut tree gets energy from the sun and makes it into cocunut that is true
Explanation:
its C, because the cocunut tree gets energy from the sun and makes it into cocunut that is true
The total number of oxygen atoms in Al2(SO4)3 is
Al2(SO4)3 =
Al2 S3 O12
Total atom :
Al = 2
S = 3
O = 12
please I need this just look at the picture for the question
What characteristic odor would you expect to observe if an alcohol reacted with acidified ethanoic acid?
a. A vinegar-like smell.
b. None.The product would be odorless.
c. A rotten fruit smell.
d. A fruity smell.
Which term refers to the process by which land is worn away by natural forces or human activity?
Answer:
erosion
Explanation:
erosion is the term that refers to the process by which land is worn away by natural forces or human activity.
Answer:
Erosion
Explanation:
Just took the test, hope it helps!
heyyy Powerpuff girls! what advantage does globe maps have over a flat map?
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Explanation:
miss girl- you could've just looked this up
(just make it look like you typed it)
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Friend?
Which of the following makes sense to round to the nearest 10?
A. Your friend's telephone number
B. The PIN code of your city or town
C. The number of pages in your Maths book
D.t he year of your birth
Answer:
C
Explanation:
You can’t round a phone number or Pin code
why would you round your birth year?
Assuming the graphs are constructed to the same scale, which seismograph shows the shortest S-P time?
Answer:
a
Explanation:
In a balanced chemical equation the mass of the reactants and products are equal.
True
False
A balanced chemical equation obeys the law of conservation of mass. In a balanced chemical equation the mass of the reactants and products are equal. The correct option is true.
What is a balanced chemical equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called coefficients. They are found in front of formulas.
According to law of conservation of mass, mass can neither be created nor be destroyed. But it can be transformed from one form to another.
In a balanced chemical equation, the total mass of the reaction remains constant. The mass of the reactants before reaction is equal to the mass of products after reaction.
Thus the given statement is true.
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(3.5x10^5)x(4x10^-3)=exponent form
Answer:
1.4 x 10³
Explanation:
Given:
(3.5 x 10⁵)x(4 x 10⁻³)
Find:
Exponent form
Computation:
⇒ (3.5 x 10⁵)x(4 x 10⁻³)
⇒ 3.5 x 4 x 10²
⇒ 14 x 10²
1.4 x 10³
Alice and Bob are experimenting with two moles of neon, a monatomic gas, that starts out at conditions of standard temperature and pressure (273.15 K, 105 Pa). Alice heats the gas at constant volume until its pressure is doubled, then Bob further heats the gas at constant pressure until its volume is doubled. If Alice and Bob assume that neon behaves as an ideal gas, then how much heat have they added to the gas for the entire process.
Answer:
29273.178 joules have been added to the gas for the entire process.
Explanation:
The specific heats of monoatomic gases, measured in joules per mol-Kelvin, are represented by the following expressions:
Isochoric (Constant volume)
[tex]c_{v} = \frac{3}{2}\cdot R_{u}[/tex] (1)
Isobaric (Constant pressure)
[tex]c_{p} = \frac{5}{2}\cdot R_{u}[/tex] (2)
Where [tex]R_{u}[/tex] is the ideal gas constant, measured in pascal-cubic meters per mol-Kelvin.
Under the assumption of ideal gas, we notice the following relationships:
1) Temperature is directly proportional to pressure.
2) Temperature is directly proportional to volume.
Now we proceed to find all required temperatures below:
(i) Alice heats the gas at constant volume until its pressure is doubled:
[tex]\frac{T_{2}}{T_{1}} = \frac{P_{2}}{P_{1}}[/tex] (3)
([tex]\frac{P_{2}}{P_{1}} = 2[/tex], [tex]T_{1} = 273.15\,K[/tex])
[tex]T_{2} = \frac{P_{2}}{P_{1}} \times T_{1}[/tex]
[tex]T_{2} = 2\times 273.15\,K[/tex]
[tex]T_{2} = 546.3\,K[/tex]
(ii) Bob further heats the gas at constant pressure until its volume is doubled:
[tex]\frac{T_{3}}{T_{2}} =\frac{V_{3}}{V_{2}}[/tex] (4)
([tex]\frac{V_{3}}{V_{2}} = 2[/tex], [tex]T_{2} = 546.3\,K[/tex])
[tex]T_{3} = \frac{V_{3}}{V_{2}}\times T_{2}[/tex]
[tex]T_{3} = 2\times 546.3\,K[/tex]
[tex]T_{3} = 1092.6\,K[/tex]
Finally, the heat added to the gas ([tex]Q[/tex]), measured in joules, for the entire process is:
[tex]Q = n\cdot [c_{v}\cdot (T_{2}-T_{1})+c_{p}\cdot (T_{3}-T_{2})][/tex] (5)
If we know that [tex]R_{u} = 8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K}[/tex], [tex]n = 2\,mol[/tex], [tex]T_{1} = 273.15\,K[/tex], [tex]T_{2} = 546.3\,K[/tex] and [tex]T_{3} = 1092.6\,K[/tex], the heat added to the gas for the entire process is:
[tex]c_{v} = \frac{3}{2}\cdot \left(8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K} \right)[/tex]
[tex]c_{v} = 12.471\,\frac{J}{mol\cdot K}[/tex]
[tex]c_{p} = \frac{5}{2}\cdot \left(8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K} \right)[/tex]
[tex]c_{p} = 20.785\,\frac{J}{mol\cdot K}[/tex]
[tex]Q = (2\,mol)\cdot \left[\left(12.471\,\frac{J}{mol\cdot K} \right)\cdot (536.3\,K-273.15\,K)+\left(20.785\,\frac{J}{mol\cdot K} \right)\cdot (1092.6\,K-546.3\,K )\right][/tex]
[tex]Q = 29273.178\,J[/tex]
29273.178 joules have been added to the gas for the entire process.
To standardize a potassium permanganate solution, a 0.250 g sample of FAS (iron (II) ammonium sulfate hexahydrate; molar mass: 342 g) is dissolved in 25.00 mL distilled water, then acidified with sulfuric acid. The solution is then titrated with 35.00 mL potassium permanganate solution from a burette until a pale persistent purple color is attained. Calculate the molarity of the potassium permanganate solution.
Calculate the [H3O+] of 0.10 M HNO2 at equilibrium. Given: Ka = 4.46 × 10-4.
Answer:
0.0067 mol/dm³Explanation:
The [H3O+] of HNO2 can be found by using the formula
[tex][H_3O^{ + } ] = \sqrt{Kac} [/tex]
Ka is the acid dissociation constant
c is the concentration of the acid
From the question we have
[tex][H3O^{ + } ] = \sqrt{4.46 \times {10}^{ - 4} \times 0.1} \\ = 0.006678...[/tex]
We have the final answer as
0.0067 mol/dm³Hope this helps you
what statement is true?
A. interia causees bodies to slow in their motion, unless they're pushed by a force.
B. Interia resist changes to the state of motion of a body.
C. Interia decelerates a body.
D. Interia is due to friction.
Answer:
B. Inertia resist changes to the state of motion of a body.
Explanation:
The force of inertia is an inherent property of matter in which it allows a body to resist changes to the state of motion of the body.
According to Newton's first law of motion "a body will remain at rest or in constant motion unless if an external force acts on it".
This is the law inertia.
The ability of a body to resist changes to the motion of the body is its inertia. Therefore, the correct choice is B.The correct name for the compound N₂O₃ is *
Answer:
Dinitrogen trioxide.
Explanation:
The correct name for the compound [tex]N_2O_3[/tex] is dinitrogen trioxide. The compound [tex]N_2O_3[/tex] also happens to be a covalent compound, and the nomenclature of covalent compounds involves the usage of numerical prefixes such as "mono-" and "tri-".
Since there are two nitrogen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "di-", meaning two, to signify that.
Since there are three oxygen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "tri-", meaning three, to signify that.
A chemist measures the amount of oxygen gas produced during an experiment. She finds that of oxygen gas is produced. Calculate the number of moles of oxygen gas produced. Be sure your answer has the correct number of significant digits.
Answer:
This question is incomplete. A fragment of the question is missing. The fragment is:
She finds that 4.87 g of oxygen gas is produced
0.152 moles
Explanation:
Using the formula: mole = mass / molar mass
According to the question, a chemist measures the amount of oxygen gas produced during an experiment. Oxygen gas has the chemical formula: O2. Hence, the molar mass will be:
O2 = 16(2) = 32g/mol
If the mass of the oxygen gas to be 4.87 g of oxygen gas.
Therefore,
moles = 4.87/32
moles = 0.152mol
which type of severe weather is related to high pressure systems?
A.Hurricane
B.Heat Wave
C.Tornado
D.Thunderstorm
Answer:
Heat waves
Explanation:
The permeability of packaging materials to CO2 is 6 times higher than the permeability to O2, which is 4 times higher than nitrogen. Despite its bigger molecular weight, carbon dioxide presents a much higher permeability, Why
Answer:
Due higher critical temperature, condensability and gas solubility.
Explanation:
The permeability of packaging materials to CO2 is 6 times higher than the permeability to O2 and nitrogen because carbondioxide gas has higher condensability and higher gas solubility in membranes. Due to its higher condensability and solubility, carbondioxide gas is more permeable that other gases such as oxygen and nitrogen gases. Carbondioxide gas also have higher critical temperature than other gases which make it more permeable than other gases.
Explore: Find an example of each of the following in the Gizmo:
A.
An example of no chemical reaction occurring:
B.
A reaction that produces an acid:
C.
A reaction that produces a base:
D.
A reaction that uses a catalyst:
Answer:
B
Explanation:
A pure substance composed of two or more different elements is aln)
a. ion
b. heterogeneous mixture
c. chemical compound
d. solid
e. solution
chemical compound
Answer:
c
Explanation:
that is my dads answer
A pure substance composed of two or more different elements is a chemical compound.
When two or more atoms are chemically combined, we refer to such a combination as a chemical compound.
Since a chemical compound contains only a given set of elements which are chemically combined together, a chemical compound is also a pure substance.
Hence, a pure substance composed of two or more different elements is a chemical compound.
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