Answer:
The answer is 2.660 mol/l
Explanation:
Given: n= 0.0665, v= 25.00ml
Required: C
C (molarity)= n (of solute)/ v (of solvent) [ standard unit: mol/l]
First convert volume of solvent in its standard unit, i.e. litres(L)
v= 25.00ml/1000= 0.02500L
C = 0.0665 mol / 0.02500 L= 2.660 mL (In proper significant digits i.e. 4 sigdigs)
Therefore, The molarity of the sulfuric acid is 2.660 mol/L :)
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.
When the phenol shown below is treated with KOH, it forms a product whose IR spectrum does not show an absorption in the 3200-3600 cm-1 region. Propose a structure for the product.?
Answer:
Explanation:
The first attached diagram shows the proposed phenol that is being treated with KOH to form Oxonine (CₐHₐO).
Reaction of Arylhalide after treatment with KOH lead to the displacement of Bromine atom with the hydrogen from the hydroxyl (OH) substituent , then forming HBr , leaving the oxy (-O) atom alone to form an Oxonine compound.
Therefore the propose structure for the product (Oxonine) CₐHₐO is shown in the second diagram attached below.
what is the product of barium + water
Explanation:
Barium reacts readily with water to form barium hydroxide, Ba(OH)2 and hydrogen gas (H2).
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.
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.
when solid surfaces slide over each other, the kind of friction that occurs is _ friction
When solid surfaces slide over each other, the kind of friction that occurs is called Sliding Friction.
A student claims that if she wanted to make a solution quickly, she should use small pellets instead of powder along with heating and stirring. Do you agree or disagree with the student's claim? This is kind of confusing for me so if anyone could help I would appreciate it : )
Answer: Yes we agree with the student's claim.
Explanation:
When the molecules are present in smaller size, more reactants can react as decreasing the size increases the surface area of the reactants which will enhance the contact of molecules.Hence, more products will form leading to increased rate of reaction.
On increasing the temperature will make more reactant molecules will have sufficient energies to cross the energy barrier and thus the number of effective collisions increases, thus leading to more products and increased rate of reaction.
When the solution is stirred , the molecule's kinetic energy and thus the rate of reaction increases.
Thus smaller size, stirring and increase of temperature will make the solution quickly.
what is the formula of the compound hydrogen gas?
Answer:
H2
Explanation:
Hydrogen gas isn't a compound but it is diatomic when found naturally hence the 2
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.
Can unit rate represent how much for one unit
Answer:A unit rate describes how many units of the first type of quantity corresponds to one unit of the second type of quantity. Some common unit rates are miles (or kilometers) per hour, cost per item, earnings per week, etc.
Explanation: hope this helps mark as brainiest
How many moles of Li3PO4 are in 2.2 L of a 0.6 M solution of Li3PO4? (remember Molarity=moles of solute/liters of solution)
Answer:
5 is the answer since I did this and got it rigt
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
Find the specific heat of an unknown material with an initial temperature of 20°C, when 5000 Joules are applied to a 50 gram sample and the final temperature is 70°C
Answer:
2J/g°C
Explanation:
Q = 5000J
Initial temperature (T1) = 20°C
Final temperature (T2) = 70°C
Specific heat capacity (c) = ?
Heat energy (Q) = mc∇T
Q = mc∇T
Q = mc(T2 - T1)
5000 = 50 × c × (70 - 20)
5000 = 50c × 50
5000 = 2500c
c = 5000 / 2500
c = 2J/g°C
The specific heat capacity of the substance is 2J/g°C
Paratrooper not hurt while landing,why?
Answer:
Paratroopers not hurt while landing because when they get to the ground, they keep their knees and feet together helping them to land properly.
hope it helps!
Answer:
they usually land on their knees and roll
Explanation:
Which is a form of kinetic energy?
gravitational energy
chemical energy
electrical energy
sound energy
DO
Answer:
Electrical
There are five types of kinetic energy: radiant, thermal, sound, electrical and mechanical.
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.
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.
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
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
Habitat loss due to the increasing human
population has caused
A. the number of extinctions to decrease
B. reductions in endangered species
C. increased biodiversity
D. decreased biodiversity
Answer:
D. decreased biodiversity
Explanation:
Habitat loss due to the increasing human
population has caused decreased biodiversity
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.
Why doesn’t alcohol freeze?
Answer: Because it's a combination of chemicals, vodka doesn't freeze at the same temperature as either water or alcohol. Of course, vodka will freeze, but not at the temperature of an ordinary freezer. This is because vodka contains enough alcohol to lower the freezing point of water below the -17°C of your typical freezer.
Explanation: .......
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.
Which statement describes the redox reaction that occurs when an object is electroplated? * 1 point 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:
Electroplating refers to the process of coating a metal on the surface of another metal. Electroplating may be carried out to improve the properties of a metal or to preserve it from corrosion.
Electroplating involve the process of electrolysis. In electrolytic cells, electrical energy causes nonspontaneous reactions to occur in a process known as electrolysis. Electrolytes are decomposed during electrolysis by the passage of direct current to form ions.
The entire process of electrolysis is non spontaneous. It requires the input of electric electric current. This is achieved by connecting a battery to supply energy to drive the non spontaneous process.
One mole of potassium permanganate, KMnO4, contains how many
grams of oxygen.
Answer: 64
:))))))))))))
Iodine-131 is a radioactive isotope, and is often used in certain medical treatments. It has a short half-life of about 8 days. If a hospital has a 750mg sample of it available, how much would be available after 48 days?
Iodine-131 is a radioactive element which keeps on decaying over the time. Decay of radioactive element always comes under first order kinetics. Therefore 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.
What is half life?Half life tells about the time at which the radioactive material decays to half of its initial concentration.
Mathematically, for first order reaction, the relationship between half life and rate constant can be given as
[tex]t_{1/2} = \frac{0.693}{K}[/tex]
where k = rate constant
[tex]t_{1/2} \\[/tex]= half life= 8 days
Substituting the given values
k=0.693÷8 =0.08days⁻¹
[tex]k=\frac{2.303}{t}log\frac{a}{a-x}[/tex]
a= initial concentration
a-x = final concentration after 48 days
[tex]0.08=\frac{2.303}{48 }log\frac{ 750}{a-x}[/tex]
solving this we get
a-x= 16.2mg
Therefore, 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.
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PLS HELP Does anyone know the answer to the question on the bottom?????
Answer:
18 g...i think 90 percent sure its 18
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.
What can be said about 1 mole of Ag and 1 mole of Au?
Explanation:
Avogadro's number. What can be said about 1 mol Ag and 1 mol Au? ... They contain the same number of atoms.
1 mole of Ag and 1 mole of Au contain the same number of particle. Therefore, option B is correct.
What is mole ?The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.
A mole is defined as the mass of a substance that has the same number of elementary particles as there are atoms in precisely 12.000 g of 12C.
In the periodic chart, group 11 includes the chemical elements roentgenium (Rg), copper (Cu), silver (Ag), and gold (Au). However, no chemical tests have yet been done to demonstrate that roentgenium behaves similarly to the heavier homologue of gold.
Thus, option B is correct.
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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.