Answer: Yes, the student is right, one should use pellets of the reactant should be heated and stirred for mixing properly.
Explanation:
In case of smaller particles the surface area that is being exposed increases and the due to this the reaction occurs faster.
Increasing the temperature of the temperature, increases the kinetic energy of the particles which helps in easy mixing of the particles.
The collision in between the particles also increase while stirring and thus the rate of reaction increases.
So, the heating and stirring is more preferred over powered reactant for making a solution quickly.
Which types of reactions would result in the production of light?
Answer:
Inorganic chemical reactions involve compounds without carbon atoms. Some of these chemical reactions emit light as the chemical compounds react. When light is emitted as a result of the chemical reaction, the reaction is said to be luminescent.
Explanation:
Answer:
Chemiluminescence is the production of light from a chemical reaction. Two chemicals react to form an excited (high-energy) intermediate, which breaks down releasing some of its energy as photons of light
What two agents are the biggest proponents of chemical weathering?
Answer:
water and carbon dioxide
Explanation:
Chemical weathering is the process of changing the composition of a mineral in order to break it down. The two agents that are the biggest proponents of chemical weathering are water and carbon dioxide. Water is used in a process called Hydrolysis which uses it to break down substances such feldspar in granite rocks changing to clay. While Carbon Dioxide in the atmosphere dissolves in rainwater forming carbonic acid, which slowly dissolve rocks when it comes into contact with them.
What volume of 17.8 M stock sulfuric acid solution would be needed to make 2.0L of 0.200 M diluted sulfuric acid solution?
Answer:
Required Volume is 22.47ml
Explanation:
To make 2.0L of 0.2M sulfuric acid required moles = 0.2 x 2 = 0.4 moles
To get 0.4 from 17.8M required quantity = 1000/17.8 x 0.4 = 22.47ml
Order the following in terms of decreasing ionization energy:
N, F, C,O,B
Answer:
F, N O, C, B
Explanation:
Ionization on the periodic table, goes from left to right, so in order to decrease in ionization, you go right to left.
Therefore leading to (F)luorine, (N)itrogen, (O)oxygen, (C)arbon, and (B)oron
A 2-column table with 3 rows. The first column labeled mechanical waves has entries ocean water, light waves, earthquake waves. The second column labeled electromagnetic waves has entries sound waves, radiation waves, X-ray waves. How should the table be changed to correctly distinguish between mechanical and electromagnetic waves? Earthquake waves and radiation waves need to change places. Light waves and X-ray waves need to change places. Ocean waves and X-ray waves need to change places. Sound waves and light waves need to change places.
Answer:
Sound waves and light waves need to change places
Explanation:
Just did this assignment on edge. Sound waves are mechanical because they need matter to travel through, while light waves are electromagnetic.
Answer:
Sound waves and light waves need to change places
Explanation:
What are the 5 categories of the food chain?
Answer:
Producer
Primary Consumer
Secondary Consumer
Tertiary Consumer
Decomposer
When 100.g Mg3N2 reacts with 75.0 g H2O, 15.0 g of NH3 is formed. What is the % yield?
Answer:
% yield = 44.5 %
Explanation:
Step 1: Data given
Mass of Mg3N2 = 100.0 grams
Mass of H2O = 75.0 grams
Mass of NH3 = 15.0 grams
Molar mass of Mg3N2 = 100.95 g/mol
Molar mass of H2O = 18.02 g/mol
Molar mass of NH3 = 17.03 g/mol
Step 2: The balanced equation
Mg3N2 + 3H2O → 3MgO + 2NH3
Step 3: Calculate moles
Moles = mass / molar mass
Moles Mg3N2 = 100 grams / 100.95 g/mol
Moles Mg3N2 = 0.99 moles
Moles H2O = 75.0 grams / 18.02 g/mol
Moles H2O = 4.16 moles
Moles NH3 = 15.0 grams / 17.03 g/mol
Moles NH3 = 0.88 moles
Step 4: Calculate the limiting reactant
For 1 mol Mg3N2 we need 3 moles H2O to produce 3 moles MgO and 2 moles NH3
Mg3N2 is the limiting reactant. It will completely be consumed (0.99 moles)
H2O is in excess. There will react 3*0.99 = 2.97 moles
There will be produced 2*0.99 = 1.98 moles of NH3
Step 5: calculate mass of NH3
Mass of NH3 = moles NH3 * molar mass NH3
Mass NH3 = 1.98 moles * 17.03 g/mol
Mass of NH3 = 33.7 grams
Step 6: Calculate the % yield
%yield = (actual yield/ theoretical yield) * 100 %
% yield = (15.0 grams / 33.7) * 100 %
% yield = 44.5 %
The percentage yield of ammonia in the given reaction has been 44.44%.
The balanced chemical reaction can be:
[tex]\rm Mg_3N_2\;+\;3\;H_2O\;\rightarrow\;3\;MgO\;+\;2\;NH_3[/tex]
The moles can be given as:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of [tex]\rm Mg_3N_2[/tex] = [tex]\rm \dfrac{100}{100.95}[/tex] molMoles of [tex]\rm Mg_3N_2[/tex] = 0.99 mol
Moles of [tex]\rm H_2O[/tex] = [tex]\rm \dfrac{75}{18.02}[/tex]Moles of [tex]\rm H_2O[/tex] = 4.16 mol
Moles of [tex]\rm NH_3[/tex] = [tex]\rm \dfrac{15}{17.03}[/tex]Moles of [tex]\rm NH_3[/tex] = 0.88 mol
The limiting reactant can be:
From the balanced equation for 3 moles of water, there has been 1 mole of magnesium nitrite. So, for 4.16 moles of water, there will be 1.38 moles of [tex]\rm Mg_3N_2[/tex]. Since the amount of [tex]\rm Mg_3N_2[/tex] has been completely consumed in the reaction, [tex]\rm Mg_3N_2[/tex] has been the limiting reactant.
So, the moles of ammonia produced =
1 moles [tex]\rm Mg_3N_2[/tex] = 2 moles ammonia.
0.99 moles [tex]\rm Mg_3N_2[/tex] = 0.99 [tex]\times[/tex] 2 moles [tex]\rm NH_3[/tex]
0.99 moles [tex]\rm Mg_3N_2[/tex] = 1.98 moles of ammonia.
The theoretical yield of ammonia = 1.98 moles
The actual yield of ammonia = 0.88 mol.
% Yield of Ammonia = [tex]\rm \dfrac{Actual\;yield}{Theoretical\;yield}\;\times\;100[/tex]
% Yield of Ammonia = [tex]\rm \dfrac{0.88}{1.98}\;\times\;100[/tex]
% Yield of Ammonia = 44.44 %
For more information about percentage yield, refer to the link:
https://brainly.com/question/12809634
what is the mass in grams of one mole of He?
Answer:
One gram helium gas is equal to the 4.002602 g/mole
Explanation:
Helium gas is a gas or chemical element. The symbol of helium gas is He and the atomic number of this gas is 2. This gas is colorless, odorless, and tasteless. It is a non-toxic gas. It is found in the periodic table in the first place.
Helium is a very lightest gas and very abundant in nature in the universe. It is present in the universe around 24 percent. Helium is also called by another name that titan of sun. This is detected by the yellow line. The liquid form of helium gas is called cryogenics. This helium gas is used in lifting balloons and airplanes.
what is the product of barium + water
Explanation:
Barium reacts readily with water to form barium hydroxide, Ba(OH)2 and hydrogen gas (H2).
Give an example of a system in which people use steam for a mechanical advantage.
Answer:
Turbines.
Explanation:
Hello,
In this case, we define steam as high-energy vapor water, which has the capacity to be cooled to release energy to a system. For instance, turbines, use overheated steam to produce energy, by feeding the steam to the turbine's rotor blades in order to make the rotate and generate work. As a consequence of the rotation, the steam loses energy, for which it goes out from the turbine at low both temperature a pressure, even do, in some cases it could go out liquid so a condensation may occur.
Regards.
Answer:
Steam turbines
Explanation:
Mechanical advantage is used to describe the attainment of an amplified force output from a minimal force input
Steam is the water in gaseous form
Therefore, an example of where people use steam for mechanical advantage includes the steam turbines in power generation being turned by steam produced from burning water from a supply.
Here the expansion of the water to steam provides power to drive the the turbines so as to perform mechanical work.
How many significant numbers 5.67x10^6
Answer:
3
Explanation:
0's aren't one of the significant figures. so it would just be 3.
Hope this helps!!!
Answer:
3
Explanation:
In multiplication you count the least amount of significant figures. All digits other than leading 0's. If zeros are after, they count as significant.
An elements’ neutral atoms have 5 valance electrons and 3 electron shells. What element is it?
Answer:
Phosphorus
Explanation:
Group 5A has 5 valence electrons.
3 electron shells equals 15 electrons on Phosphorus. Furthermore, 2 on shell 1, 8 on shell 2, and 5 on shell 3.
- Hope that helps! Please let me know if you need further explanation.
If energy is shown on the product side of the equation, then the reaction
Answer:
Exothermic reaction
Explanation:
It is an exothermic reaction i.e. energy is released during the reaction.
What is thermal equilibrium?
Which statement describes the redox reaction that occurs when an object is electroplated?
A. It is spontaneous and requires an electric current.
B. It is spontaneous and produces an electric current.
C. It is nonspontaneous and requires an electric current.
D. It is nonspontaneous and produces an electric current.
Answer:
C. It is nonspontaneous and requires an electric current.
Explanation:
An oxidation-reduction (redox) reaction is a type of chemical reaction in which electrons are transferred between chemical species. In redox reactions, a reduced half and an oxidized half occur together. When an object is electroplated, the occurrence of a redox reaction is nonspontaneous and it requires an electric current.
A sample of gas at 25 C has a volume of 11 L and exerts a pressure of 0.868 atm. How many moles of gas are in the sample?
0.39 mol
3.9 mol
9.3 mol
87 mol
Answer:
0.39 moles of gas are in the sample
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P*V = n*R*T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.
In this case:
P= 0.868 atmV= 11 Ln= ?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T=25 C= 298 KReplacing:
0.868 atm*11 L= n*0.082 [tex]\frac{atm*L}{mol*K}[/tex] *298 K
Solving:
[tex]n=\frac{0.868 atm*11 L}{0.082 \frac{atm*L}{mol*K} *298 K}[/tex]
n= 0.39 moles
0.39 moles of gas are in the sample
How many moles of solute are needed to prepare 16.0 ml of a 0.415 M Pb(NO3)2, solution?
A .00664
B .0072
C 2.81
D 2.59
Answer:
[tex]N_{solute}=6.64x10^{-3}mol[/tex]
Explanation:
Hello,
In this case, we define molarity as shown below:
[tex]M=\frac{N_{solute}}{V_{solution}}[/tex]
Whereas we have the moles of the solute and the volume of the solution in litres, in such a way, for finding the moles we solve for it as shown below:
[tex]N_{solute}=M*V_{solution}[/tex]
[tex]N_{solute}=0.415\frac{mol}{L} *16.0mL*\frac{1L}{1000mL}\\ \\N_{solute}=6.64x10^{-3}mol[/tex]
Best regards.
Answer:
0.00664 moles of solute are needed to prepare the solution.
Explanation:
Molarity is a unit of concentration based on the volume of a solution and is defined as the number of moles of solute per liter of solution. In other words, molarity is defined as the number of moles of solute that are dissolved in a given volume and is determined by the following expression:
[tex]Molarity (M)=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
Molarity= 0.415 Mnumber of moles of solute= ?volume= 16 mL= 0.016 L (being 1 L= 1000 mL)Replacing:
[tex]0.415 M=\frac{number of moles of solute}{0.016 L}[/tex]
Solving:
number of moles of solute= 0.00664
0.00664 moles of solute are needed to prepare the solution.
As a sodium atom is oxidized the number of protons in its nucleus
Answer:
The proton remains the same.
Explanation:
Oxidation is simply defined as the loss of electron(s) during a chemical reaction either by an atom, molecule or ion.
Oxidation is strictly on the transfer of electron(s) and not proton.
A metal that undergoes oxidation still has its protons intact otherwise it will not be called the ion of the metal since atomic number is called the proton number.
Sodium (Na) undergoes oxidation as follow:
Na —> Na+ + e-
Na is called sodium metal.
Na+ is called sodium ion.
Na has 11 electrons and 11 protons
Na+ has 10 electrons and 11 protons
From the above illustration, we can see that the protons of Na and Na+ are the same why their electrons differ because Na+ indicates that 1 electron has been loss or transferred.
1. Energy is required for chemical
reactions to take place. What form of
energy is used in cooking?
which law motion is used to explain how to a rocket takes off
Answer:
newtons 3rd law
Explanation:
if the engine is supplying propulsion, then the mass will be pushed by it.
Vaporization that takes place inside a liquid is called________.
Answer:
evaporation
Explanation:
Answer:
Boiling
Explanation:
When a substance transitions from liquid to gas, it's called evaporation if it's on the surface, and boiling if it's all throughout the liquid.
Picture boiling water in a pot: it starts on the bottom, and the bubbles go toward the top. Evaporation starts on the surface.
define the term inertia
Answer:
Explanation:
Enertia is an integral part of Newton's first law of motion.
It is the tendency of an object to stay at rest or to continue moving until and unless any external unbalanced force, (like, applied force or force of tension or frictional force ) is applied to either move it from rest or change its speed(in other words, accelerate it!!).
Example below, is of ball at rest (fig1) and if this ball is moving straight on a frictionless surface(like ice) it will keep moving!! until, we push it or pull it.
the train traveled 100 miles in 4 hours how fast was the train traveling
Answer: the train was going 25 mph
Explanation: 100 divided by 4 is 25
Answer:
the train traveled 25 Miles per hour
Explanation:
100 divided by 4 is 25
Where does the energy go in an endothermic reaction?
when heat energy is absorbed
Answer:
Nowhere
Explanation:
The energy doesn't go anywhere, it just gets absorbed into the object making it hotter.
Order the following in terms of decreasing atomic radius:
Ba, Cs, Hf, Bi, Ta
Answer:
Cs > Ba > Bi > Hf > Ta
Explanation:
The atomic radius of a chemical element defined as the distance between nucleus and electron from the center.
The atomic number and atomic radius of given elements are:
Barium (Ba):
Atomic number - (56)
Atomic radius - 268 pm
Caesium (Cs)
Atomic number - 55
Atomic radius - 343 pm
Hafnium (Hf):
Atomic number - 72
Atomic radius - 225 pm
Bismuth (Bi):
Atomic number - 83
Atomic radius - 230
Tantalum (Ta):
Atomic number - 73
Atomic radius - 220 pm
According to the given atomic radius the decreasing order of atomic radius is Cs > Ba > Bi > Hf > Ta.
Caesium has highest atomic radius among all even though lowest atomic number because the force of attraction between the nucleus and the outermost electron is low and outermost electron are loosely held.
Barium (Ba) has lower atomic number than Bismuth (Bi) but still atomic radius of Barium is high because moving across the periodic table atomic radius decreases as force of attraction between nucleus and outer electrons is high.
Bismuth (Bi) has higher atomic number that Hafnium (Hf), atomic radius of Bi is more than Hf.
Tantalum (Ta) have higher atomic number than Hafnium (Hf) but still have lower atomic radius as as force of attraction between nucleus and outer electrons is high.
Hence, the decreasing atomic radius is Cs > Ba > Bi > Hf > Ta.
4. All of the following are examples of natural causes of air pollution
except -
hurricans
factory emissions
forest fires
tornadoes
ANSWER PLEASE AND THANK YOU☺️(bless you btw)
Answer:
factory emissions
Explanation:
1. What type of reaction occurs when an acid reacts with a base?
A gas at 80 kPa occupies a volume of 5 mL. What volume will the gas occupy at 70 kPa
Answer:
Volume will the gas occupy at [tex]70[/tex] kPa [tex]= 5.71[/tex]
Explanation:
As per the gas law
[tex]P_1V_1 = P_2V_2[/tex]
Here
[tex]P_1 =[/tex] initial pressure of the gas
[tex]P_2[/tex] = final pressure of the gas
[tex]V_1 =[/tex] Initial volume of the gas
[tex]V_2[/tex] = the final volume of the gas
here,
[tex]P_1 = 80[/tex] kPa
[tex]V_1 = 5[/tex] mL
[tex]P_2 = 70[/tex]
Substituting the given values in above equation, we get -
[tex]80 * 5 = 70 * V_2\\V_2 = 5.71[/tex]
Volume will the gas occupy at [tex]70[/tex] kPa [tex]= 5.71[/tex]
What will happen if blue litmus paper is placed in a solution of HCL? What does the change indicate about the HCL solution?
Answer: It turns the blue litmus paper to red.
Explanation: A blue litmus paper deeped in a solution of HCl will turn to red, indicating the presence of H+ or H30+, and telling us the solution is an acid.
What types of reactions is shown below? check all that apply 2H2O2–>2H2O+O2
A) synthesis
B) decomposition
C) combustion
Answer:
Type of reactions :
Decomposition (O is seperated)