Answer:
n physical sciences, subatomic particles are smaller than atoms. They can be composite particles, such as the neutron and proton; or elementary particles, which according to the standard model are not made of other particles. Particle physics and nuclear physics study these particles and how they interact.
Explanation:
a particle smaller than an atom (e.g., a neutron) or a cluster of such particles (e.g., an alpha particle).
__Is when water changes from a solid to a liquid
When water changes from a solid to a liquid it is called melting.
Solid ice melts and forms into a liquid: water.
If this incorrect, please, don't refrain to tell me. Thank you.
Balancing chemical equation:
_Na+_MgF2—>_NaF+_Mg
Na= ? Na= ?
Mg= ? Mg= ?
F= ? F= ?
2Na + MgF2 → 2NaF + Mg
explain what is the difference between bohr and rutherford atomic models
Answer:
The Rutherford Model shows an atom with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. The Bohr model shows electrons travel in defined circular orbits around the nucleus.
in today's pandemic,how can you protect our ozone depletion?
Answer:
if you want to protect our ozone depletion you have aerosol products that don't contain HCFCs and CFCs as stimulus or incitement
Explanation:
why you should use aerosol because when the liquid mixture is freeded or released from the aerosol the liquid propellant becomes a gas so this can easily break up the product into a fine haze or a mist hope its helpful have a good luck
After reading that a solution is a homogeneous mixture, Hala wondered about her favorite
morning drink, grape juice. Which statement about the solution that makes up grape juice is
true? *
1Sugar is one of the solvents, and grapes are one of the solutes.
2Grapes are the solvent and water is one of the solutes.
3Water is the solvent, and sugar is one of the solutes.
4Sugar is the solvent, and water is one of the solutes.
Someone help please ...
Answer:
Yes
Explanation:
4. How can acids and bases behave in terms of electrolytes/reactivity?
Answer:
Strong acids are strong electrolytes. Such acids ionize completely.
Weak acids and bases are weak electrolytes. Such bases and acids ionize only to a small extent.
Explanation:
Electrolytes are the substances that produce ions when they are dissolved in water. Electrolytes can be categorized as bases, acids, and salts.
Strong acids are strong electrolytes. Such acids ionize completely.
Weak acids and bases are weak electrolytes. Such bases and acids ionize only to a small extent.
CaC2 + 2H2O ⟶ C2H2 + Ca(OH)2
How many moles of water are needed to produce 56.8g C2H2?
Amount of moles of water is 4.36 mol
Explanation: M(C2H2) = 2·12.01 + 2·1.008 = 26.036 g/mol
Amount of substance is n= m/M= 56.8 g / 26.036 g/mol= 2.18159 mol
Water is needed 2·2.18 mol = 4.36 mol
Which of the following statements is true about the molecule shown below?
Answer:
B. The bonds are polar and the molecule is nonpolar.
Explanation:
Each bond in the molecule is polar, as indicated by the partial charges on the atoms of the molecule. However, the four atoms are arranged symmetrically around the central atom. In this case, the effects of the partial charges on opposite sides cancel out. As a result, the molecule as a whole is nonpolar. If exposed to an electric field, the molecule will not orient itself in any particular direction.
In the reaction 2 FeBr3 + 3 Cl2 → 2 FeCl3 + 3 Br2, how many grams of bromine gas are produced from 2.50 moles of FeBr3?
Answer:
but iron is 2 and 3 by its valance how could it be possible
3) Explain why elements in the same group
similar properties
Answer:
The elements of the same group have the same number of valence electrons, that is why they have similar properties
Present in a state where it molecules are far apart during a change of state it's molecules slow down which change of state has most likely taken place from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma
Answer:
The change of state that has occurred is from a gas to a liquid
Note: The question is incomplete. The complete question is given blow.
H₂O is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?
from a gas to a liquid
from a liquid to a gas
from a solid to a liquid
from a gas to a plasma
Explanation:
Water can exists in three states: as gaseous water vapor, as liquid water, and as solid ice. Each of these states of water can be interconverted from one to another by the addition or removal of heat in a process known as change of state.
Liquid water can be converted to solid ice by the removal of heat, while solid ice ice can be converted to liquid water by the addition of heat. Also, liquid water can be converted to water vapor by the addition of heat, while water vapor can be converted to liquid water by the removal of heat.
Of the three states of water, the one in which the molecules are farthest apart is in the gaseous state. The molecules have high kinetic energy and move randomly while colliding with one another. When a heat is removed from these highly energetic molecules, the molecules slow down and lose some of their kinetic energy and a change of occurs from gaseous to liquid state.
Therefore, the change of state that occurred as described, is from gas to liquid.
Why do power plants emit such a high percentage of pollutants?
They burn fossil fuels, which releases huge amounts of sulfur dioxide and nitrogen oxide that pollute the air. ... Two thirds of all sulfur dioxide and more than one third of all nitrogen oxides that pollute the air.
De la reacción 3Zn+ 2H2PO4----> Zn3(PO4)2 +2H2 por cada 9 moles de zinc cuantos moles de fosfato de zinc se producen
Answer:
Por cada 9 moles de zinc, 9 moles de fosfato de zinc se producen.
Explanation:
La reacción balanceada es:
3 Zn+ 2 H₂PO₄ → Zn₃(PO₄)₂ + 2 H₂
Por estequiometria de la reacción (es decir, la relación entre la cantidad de reactivos y productos en una reacción química), las siguientes cantidades de moles de cada compuesto participan de la reacción:
Zn: 3 moles H₂PO₄: 2 moleZn₃(PO₄)₂:1 mole H₂: 2 molesEntonces podes aplicar la siguiente regla de tres: si por estequiometria 3 moles de zinc produce 1 mol de fosfato de zinc, 9 moles de zinc cuántos moles de fosfato de zinc producirá?
[tex]moles de fosfato de zinc=\frac{9 moles de zinc*1 mole de fosfato de zinc}{3 moles de zinc}[/tex]
moles de fosfato de zinc= 9
Por cada 9 moles de zinc, 9 moles de fosfato de zinc se producen.
Which statement correctly describes the relationship between air temperature and air pressure?
-Warm air rises, creating an area of low pressure.
-Cool air sinks, creating an area of low pressure.
-Warm air sinks, creating an area of low pressure.
-Cool air rises, creating an area of low pressure.
Answer:
-Warm air sinks, creating an area of low pressure.
Explanation:
Heat will weigh more, than cool air!
two different people run a race the graphs track their distance vs. times during the race. Explain the difference between the two runners motions. use words like speed and acceleration.
Answer:
Runner A is moving at a constant speed, therefore has a positive acceleration.
Runner B is moving at a constant speed, stopping, then speeding up again.
Explanation:
heeeeeeeeeeeeeeelpheeeeeeeeeeeeeeelp
Answer:
the mirror forms a virtual inlarged image
Explanation:
I need help with #4 please
Answer:
1. Land 2. open 3. broken 4. Lava matter 5. Force of the plates
How many moles of ammonia gas can be formed from 14.0 L of hydrogen gas 300 K and a pressure of 2.0 atm
Answer:
n = 1.14 mol
Explanation:
Hello there!
In this case, according to the ideal gas law:
[tex]PV=nRT[/tex]
It is possible to solve for the moles of the gas given the volume, temperature and pressure:
[tex]n=\frac{PV}{RT}[/tex]
Thus, we plug in 14.0 L, 300 K and 2.0 atm to obtain:
[tex]n=\frac{2.0atm*14.0L}{0.08206\frac{atm*L}{mol*K}*300K}\\\\n=1.14mol[/tex]
Best regards!
Please help will mark brainiest as well.!!
Using the figure, angels p and w are example of
Answer :)
Answer:
D
Explanation:
we just did this in class last week haha i know my math :)
Give one example of
a) Homogeneous mixture of two elements
Answer:
honey
Coffee
blood
Explanation:
These components are uniformly distrubuted and these cannot be seperated unlike heterogeneous
how many mols are in 100.g of Fe?
Answer:
1.79 moles
Explanation:
1.79 moles
1.79 moles
1.79 moles
1.79 moles
Answer:1.79 moles
1.79 moles are there in 100g of iron.
Explanation:
thats the answer for it
Why do the more complex sugar disaccharides store more energy than
monosaccharides?
Answer:
Because Disaccharides have more chemical bonds.
Explanation:
Ethanol, C2H5OH, reacts with phosphorus trichloride, PC13:
3C2H5OH(aq) + PC13(aq) - 3C2H5C1 (g) + H3PO3(aq)
Which is the actual mass of chloroethane, C2H5CI, produced if 138.0 g of ethanol is
consumed in excess phosphorus trichloride? The percentage yield for this reaction is
93.00 %.
Answer:
no
Explanation:
no
Can someone help, please...?
I really can't understand this...
2. Calculate the mass of Kool-Aid needed to make 0.1 L solutions at the following concentrations: a. 0.1 M b. 0.2 M c. 0.3 M d. 0.4 M e. 0.5 M
A tall plant (Tt) is crossed with a short plant (tt). What percent will be short?
Group of answer choices
75%
0%
100%
50%
25%
it should be 50/50 percent
so 50%
hopefully this is right !
2. What happens to the temperature of air when it is compressed?
Explanation:
the pressure and temperature of the air increase
reason:
the volume of the space containing air decreases.
Explanation:
Whether you know it or not, compressed air is involved in every aspect of our lives, from the balloons at your birthday party to the air in the tires of our cars and bicycles. It was probably even used when making the phone, tablet or computer you’re viewing this on.
The main ingredient of compressed air is - you guessed it! - air. Air is a gas mixture, which means it consists of many different gases. Primarily these are nitrogen (78%) and oxygen (21%).
The temperature of the air is directly proportional to the mean kinetic energy of these molecules. This means that the air temperature will be high if the mean kinetic energy is large (and the air molecules move faster). The temperature will be low when the kinetic energy is small.
Compressing the air makes the molecules move more rapidly, which increases the temperature. This phenomenon is called “heat of compression”. Compressing air is literally to force it into a smaller space and as a result bringing the molecules closer to each other. The energy that gets released when doing this is equal to the energy required to force the air into the smaller space. In other words, it stores the energy for future use.
Calculate the pH during the titration of 20.00 mL of 0.1000 M HNO2(aq) with 0.1000 M KOH(aq) after 13.27 mL of the base have been added. Ka of nitrous acid = 7.1 x 10-4.
Answer:
pH = 2.462.
Explanation:
Hello there!
In this case, according to the reaction between nitrous acid and potassium hydroxide:
[tex]HNO_2+KOH\rightarrow KNO_2+H_2O[/tex]
It is possible to compute the moles of each reactant given their concentrations and volumes:
[tex]n_{HNO_2}=0.02000L*0.1000mol/L=2.000x10^{-3}mol\\\\n_{KOH}=0.1000mol/L*0.01327L=1.327x10^{-3}mol[/tex]
Thus, the resulting moles of nitrous acid after the reaction are:
[tex]n_{HNO_2}=2.000x10^{-3}mol-1.327x10^{-3}mol=6.73x10^{-4}mol[/tex]
So the resulting concentration considering the final volume (20.00mL+13.27mL) is:
[tex][HNO_2]=\frac{6.73x10^{-4}mol}{0.01327L+0.02000L} =0.02023M[/tex]
In such a way, we can write the ionization of this weak acid to obtain:
[tex]HNO_2+H_2O\rightleftharpoons NO_2^-+H_3O^+[/tex]
So we can set up its equilibrium expression to obtain x as the concentration of H3O+:
[tex]Ka=\frac{[NO_2^-][H_3O^+]}{[HNO_2]}\\\\7.1x10^{-4}=\frac{x^2}{0.02023M-x}[/tex]
Next, by solving for the two roots of x, we get:
[tex]x_1=-0.004161M\\\\x_2=0.003451M[/tex]
Whereas the correct value is 0.003451 M. Finally, we compute the resulting pH:
[tex]pH=-log(0.003451)\\\\pH=2.462[/tex]
Best regards!