Answer: 2. 7g of Li
Explanation: A mole of any substance contains the same number of particles (Avogadro's number, 6.02*10^23). 1 gram atomic mass of He (4g) is equivalent to 1 mole; so is 1 gram atomic mass (7g) of Li
What are the three physical properties of a copper penny?
a. color, reactivity, density
b. color, mass, oxidation
c. color, reactivity, mass
d. color, mass, shape
According to Le Chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that
reduces the stress.
normalizes the stress.
increases the stress.
changes the stress.
Answer:
its A reduces stress :)))
Explanation:
According to Le Chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress.
What is Le Chatelier’s principle ?Le Chatelier’s principle states that when a chemical equilibrium become imbalance by any change such as change in concentration, temperature, pressure etc. the system will reduces this stress by creating a new equilibrium state.
By this principle, when temperature increases for an endothermic system, forward reaction will takes place more since the temperature is absorbed there.
Similarly, when the concentration of any reactant increases, the reaction will turn to that direction in which that reactant is consumed more. If any loss the volume, then the equilibrium will shifts to that direction in which the that substance is produced.
Hence, the system will somehow manage the imbalance by reducing the stress occurred.
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Explain the bond between Mg2C12 and also what type of bond will it be ionic or covalent?
A clear, pure liquid sample is brought into the lab and exposed to an electrical current. Different gases are
produced on each of the electrodes. The sample is -
a. an element
b. an alloy
c. a compound
d. a polymer
The sample here is a compound. The correct option is c.
What is a compound?A chemical compound is a substance made up of many identical molecules that contain atoms from more than one chemical element and are held together by chemical bonds.
A molecule made up of only one element's atoms is thus not a compound.
The anode undergoes oxidation, while the cathode undergoes reduction. The species being oxidized provides the electrons.
An electrode in an electrochemical cell is referred to as an anode or a cathode depending on the direction of electron flow.
The electrode reacts with the electrolyte at the anode, producing electrons.
These electrons build up at the anode. Meanwhile, another chemical reaction occurs at the cathode, allowing that electrode to accept electrons.
Thus, the correct option is c.
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Is science logical please help meeeeeee
Answer:
It kind of is logical so my answer is yes
How many moles of xenon do 5.66 x 10^23 atoms equal
Answer:
0.94 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.66 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{5.66}{6.02} \\ = 0.940199...[/tex]
We have the final answer as
0.94 molesHope this helps you
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What is one way in which sound and light are alike?
They both travel easily through wood.
They are both types of energy.
They both can travel through outer space.
They both make it easier for you to see what you are doing.
Answer:
B)They are both types of energy.
Explanation:
Answer:
they both travel easily through wood
Explanation:
i don't want your rbx i just wanna help you:)
HELPPPPPPPPPP:-( :-( :-( :-(
DETERMINE THE MASS NUMBER OF EACH OF THE ISOTOPES OF LITHIUM
Answer:
6u and 7u
Explanation:
no of neutrons in 1= 3
no of protons in 1=3
mass=3+3=6
same method applies to the 2nd one
In the Bronsted-Lowry model of acids and bases, an _____ is a hydrogen donor and a _____ is a hydrogen acceptor.
Answer:
According to Bronsted-lowry concept an acid is a hydrogen donnor and a base is a hydrogen acceptor.
Explanation:
Please help I’ll give you guys brainiest!
Thank youuuuuuu :))
Answer:
in left direction
mark me as brainelist
Answer:
left
Explanation:
the force pulling the object is greater on the left than the right and therefore the object will be pulled to the left
Nuclear fusion reactions release more energy than fission reactions while also generating less waste. However, nuclear fusion reactors are not currently used to generate electricity.
What is the main reason for this?
Nuclear fusion reactions release high energy and required tremendous temperature of nuclear reactors is the main reason for not used to generate electricity.
What are nuclear reactions?Nuclear reactions are those reactions which are taking place in the nucleus of any unstable atom and produces energy.
As in the question it is given that nuclear fusion reactions releases more energy and less wastage, but this energy are releases in the tremendous amount which can be proved harmful for the environment and the humans. To carry out this reaction we have to maintain the very high temperature of nuclear reactors of about 6 times greater than sun's temperature, which is not possible manually.
Hence, high temperature of nuclear reactors and high amount of energy released is the main reason.
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what are the three things transported by global ocean circulation?
Answer:
The produce large circular currents in all the ocean basins. Currents, The North Equatorial Current, the Gulf Stream, the North Atlantic Current, and the Canary Current.
Explanation:
Which two options are examples of chemical changes? A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.
Answer: B. When two clear, colorless liquids are mixed together, a white solid forms.
D. A white piece of paper turns black and gives off a smell when burned.
Explanation:
A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.
When two clear, colorless liquids are mixed together, a white solid forms. A white piece of paper turns black and gives off a smell when burned. These two options are examples of chemical changes.
What is chemical change ?Chemical change, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
A chemical transformation is one in which one or more new compounds are created. Chemical reactions are another name for a chemical transformation. Examples include burning any stuff and iron rusting.
Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
Thus, option B and D are correct.
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What is the percent composition of Ca(C2H3O2)2?
Select one:
a. 25.3% Ca, 30.4% C, 3.8% H, 40.5% O
b. 40.4% Ca, 24.2% C, 3.1% H, 32.3% O
c. 6.67% Ca, 26.67% C, 40.0% H, 26.67% O
d. 12.5% Ca, 25% C, 37.5% H, 25% O
Answer:
a
Explanation:
relative formula mass of Ca(C2H3O2)2=158
% for Ca=25.3
% for C=30.4
% for H=3.8
% for O=40.5
Answer:
Choice a. The compound [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] contains approximately [tex]25.3\%\; \rm Ca[/tex], by mass, approximately [tex]30.4\%\; \rm C[/tex] by mass, approximately [tex]3.8\%\; \rm H[/tex] by mass, and approximately [tex]40.5\%\; \rm O[/tex] by mass.
Explanation:
Look up the relative atomic mass of these elements on a modern periodic table:
[tex]\rm Ca[/tex]: [tex]40.078[/tex].[tex]\rm C[/tex]: [tex]12.011[/tex].[tex]\rm H[/tex]: [tex]1.008[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].The relative atomic mass of an element gives the numerical value of the mass (in grams) of one mole of the atoms of this element. For example, the relative atomic mass of hydrogen is [tex]1.008[/tex]. Therefore, the mass of one mole of hydrogen atoms would be (approximately) [tex]1.008\; \rm g[/tex].
One mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units include:
[tex]1\; \rm mol[/tex] of [tex]\rm Ca[/tex] atoms, and[tex]2\; \rm mol[/tex] of [tex]\rm (C_2H_3O_2)^{-}[/tex] ions.Inside each mole of [tex]\rm (C_2H_3O_2)^{-}[/tex] ions, there are:
[tex]2\; \rm mol[/tex] of [tex]\rm C[/tex] atoms,[tex]3\; \rm mol[/tex] of [tex]\rm H[/tex] atoms, and[tex]2\; \rm mol[/tex] of [tex]\rm O[/tex] atoms.Therefore, that [tex]2\; \rm mol[/tex] of [tex]\rm (C_2H_3O_2)^{-}[/tex] ions in one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units would include:
[tex]2\; \rm mol \times 2 = 4\; \rm mol[/tex] of [tex]\rm C[/tex] atoms,[tex]3\; \rm mol \times 2 = 6\; \rm mol[/tex] of [tex]\rm H[/tex] atoms, and[tex]2\; \rm mol \times 2 = 4\; \rm mol[/tex] of [tex]\rm O[/tex] atoms.In summary, each mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units would contain:
[tex]1\; \rm mol[/tex] of [tex]\rm Ca[/tex] atoms,[tex]4\; \rm mol[/tex] of [tex]\rm C[/tex] atoms,[tex]6\; \rm mol[/tex] of [tex]\rm H[/tex] atoms, and[tex]4\; \rm mol[/tex] of [tex]\rm O[/tex] atoms.Calculate the mass of these atoms using their relative atomic mass data.
For example, the mass of one mole of [tex]\rm H[/tex] atoms is (approximately) [tex]1.008\; \rm g[/tex] because the relative atomic mass of hydrogen is [tex]1.008[/tex]. Therefore, the mass of that [tex]6\; \rm mol[/tex] of hydrogen atoms would be approximately:
[tex]6\; \rm mol \times 1.008\; \rm g \cdot mol^{-1} = 6.048\; \rm g[/tex].
Similarly, calculate the mass of the other three elements in one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units:
[tex]40.078\; \rm g[/tex] of [tex]\rm Ca[/tex].[tex]48.044\; \rm g[/tex] of [tex]\rm C[/tex].[tex]6.048\; \rm g[/tex] of [tex]\rm H[/tex].[tex]63.996\; \rm g[/tex] of [tex]\rm O[/tex].The sum of these masses is [tex]158.166\; \rm g[/tex].
In other words, the mass of one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units is (approximately) [tex]158.166\; \rm g[/tex]. Approximately [tex]40.078\; \rm g[/tex] of that is [tex]\rm Ca[/tex]. Therefore, the percentage of [tex]\rm Ca\![/tex] by mass in [tex]\rm Ca(C_2 H_3 O_2)_2\![/tex] would be approximately:
[tex]\begin{aligned}&100\%\times \frac{40.078\; \rm g}{158.166\; \rm g} \quad \genfrac{}{}{0pt}{}{\leftarrow\text{mass of $\mathrm{Ca}$ in $\mathrm{Ca(C_2 H_3 O_2)_2}$}}{\leftarrow\text{mass of $\mathrm{Ca(C_2 H_3 O_2)_2}$}}\\ & \approx 25.3\% \end{aligned}[/tex].
In other words, [tex]\rm Ca[/tex] accounts for approximately [tex]25.3\%[/tex] of the mass of [tex]\rm Ca(C_2 H_3 O_2)_2\![/tex].
In a similar way, calculate the percentage of the other three elements by mass.
[tex]\rm C[/tex]: approximately [tex]30.4\%[/tex].[tex]\rm H[/tex]: approximately [tex]3.8\%[/tex].[tex]\rm O[/tex]: approximately [tex]40.5\%[/tex].Which of the following are NOT possible electron configurations?
What are some examples of HIGH resistance? Question 2 options:
long wire, wide wire, more resistors
wide wire, short wire, less resistors
long wire, narrow wire, more resistors
narrow wire, less resistors, long wire
(PLEASE HURRY! I NEED TO FINISH THIS QUIZ)
Answer:
long wire, wide wire, more resistors
long wire, narrow wire, more resistors
Explanation:
longer wires have greater resistance. The longer the wire the greater the resistance.
The answer is Long wire, Narrow wire, more resistors
Evidence:
What is the rise in sea level between 1930 and 2003?
A)
About 20cm
B)
About 16cm
C
About 12cm
Answer:
about 16
Explanation:
its 20 - ( approximately 5)
= approximately 16
Answer:
It should be (C) about 12cm
A loop of wire turns between two permanent magnets in a generator. What is
the effect of this motion?
OA. A current of electricity flows from one magnet to the other.
OB. Current stops flowing through the loop of wire.
OC. Mechanical energy transforms into electrical energy.
O
D. The permanent magnets quickly reverse poles, reversing the
current's direction.
Answer:
a current flows through the loop of wire.
Explanation: my answers were worded diffrently
A loop of wire turns between two permanent magnets in a generator and the effect of this motion is conversion of Mechanical energy transforms into electrical energy.
What is generator?Generator is a device which is used to convert mechanical energy to electrical energy.
In generator between the two poles of magnet a loop of wire rotate by the mechanical force which produces magnetic field which in turn convert into the electric field.
Hence, option (c) is correct.
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Need help! Don’t understand
Consider the balanced chemical
reaction below. When the reaction was
carried out, the calculated theoretical
yield for iron was 365 grams, but the
measured yield was 278 grams. What
is the percent yield?
Fe2O3 + 3C0 2Fe + 3C02
Explanation:
Percentage yield = (278/365) * 100% = 76.16%.
Answer:
[tex]\boxed {\boxed {\sf 76.2 \% }}[/tex]
Explanation:
A percent yield helps measure how successful or precise a reaction was. It is ratio of measured yield to theoretical yield as a percent. The formula is:
[tex]percent \ yield=\frac{actual \ yield}{theoretical \ yield } *100[/tex]
For this reaction, the measured/actual yield was 278 grams, while the theoretical yield was 365 grams.
[tex]actual = 278 \ g \\\theoretical= 365 \ g[/tex]
Substitute the values into the formula.
[tex]percent \ yield =\frac{278 \ g}{365 \ g} *100[/tex]
Divide first. The grams (g) will cancel out.
278 g/365 g= 278/365=0.7616438356[tex]percent \ yield =0.76164383561*100[/tex]
Multiply.
[tex]percent \ yield=76.1643835616[/tex]
The original measurements both had 3 significant figures, so we should round our percent yield to 3 sig figs. In this case, that is the tenths place.
The 6 in the tenth place tells us to round the 1 up to a 2.
[tex]percent \ yield \approx 76.2[/tex]
The percent yield is about 76.2 %
Is 2AgNO3 + BaCI2 -> 2AgCl + Ba(NO3)2 Balanced or unbalanced. If unbalanced which element cause the unbalance
Answer:
This is balanced
Explanation:
Both sides contain 2 Ag 2 NO3 1 Ba and 2 Cl.
what are the materials made by chemists for use in washing clothes and cooking materials
Answer:
water
hehehehheehehhe
Battery
Lightbulb
Metal
paper
clips
Wood
Motal noodle
Wire
Why does the bulb light when the needle touches a paper clip?
point
1. convection cells are produced
2. vibrations set up wavelike disturbances
ОООО
3. a circuit is completed
4. a phase change occurs
Answer:
A circut is comepleted
Explanation:
The bulb light when the needle touches a paper clip because the circuit is completed.
What is circuit?An electronic circuit comprises of individual electronic components like resistors, diodes,transistors , capacitors,etc. which are connected to each other by means of wires through which electric current flows.It can also be referred to as an electronic circuit.
It usually comprises of at least one active component . The combination of wires and simple and complex components allows operations to be performed, amplification of signals, displacement of data and performing of computations.
There are three types of circuits , an analog circuit ,a digital circuit and a mixed circuit which is combination of digital and analog circuits , even semiconductors are used in circuits.
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In an experiment, what responds to the change of the independent variable?
Answer:
Independent Variable
Explanation:
what is the mass of H2o required to dissolve 14.5g of glucose
if the molality of solution is 0.24 molal
Answer:
Mass of water = 0.33 Kg
Explanation:
Given data:
Mass of water = ?
Mass of glucose = 14.5 g
molality of solution = 0.24 m
Solution:
Number of moles of glucose:
Number of moles = mass/molar mass
Number of moles = 14.5 g/ 180.156 g/mol
Number of moles = 0.08 mol
Mass of water:
Molality = number of moles of solute / Kg of solvent
0.24 m = 0.08 mol / Kg of solvent
Kg of solvent = 0.08 mol / 0.24 m
Kg of solvent = 0.33 Kg
I need help on either question you can answer. Thank you god bless
1.Atomic Number (Z) = Mass Number (A) - Number of Neutrons
neutrons = mass number-atomic number
Atomic mass Cl-37= 17
Mass number Cl-37=37
Neutrons = 37-17=20
2. Mass atom X = mass isotope 1 . % + mass isotope 2.%...
[tex]\tt atomic~mass~X=0.0224\times 88+0.7832\times 90+0.1944\times 91=90.1[/tex]
3. The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
f = c / λ, so :
[tex]\tt E\approx f\approx \dfrac{1}{\lambda}[/tex]
Energy is directly proportional to frequency and inversely proportional to the wavelength
So, as the frequency of photon increases, the energy of photon increases
4. Based on answer number 3 :
A. The wavelength becomes longer, and the energy decreases
How are S waves and surface waves similar?
Both arrive after P waves.
Both compress the ground.
Both travel through liquids.
Both produce minimal ground motion.
I will give out brainliest
Answer:
The answer to this question is A. Both arrive after P waves
Explanation:
Because since P waves always come first surface and S waves come after.
PLEASE HELP
Fossil fuels are burnt in power plants to produce electricity. Which one of the
following sequences show the correct order of energy transformation?
Answer:
a
Explanation:
Chemical then thermal because the carbon emissions produce heat
Then kinetic because there is energy transfer then electric because that's the finished result
Typhoons are large storms that form over the Pacific Ocean Hurricanes are large storms that form over the Atlantic Ocean. Which of the following are essential components in the formation of a hurricane
or a lyphoon
A High pressure, high temperature, cyclonic winds, dry air
B. High pressure cool temperature, strong winds, humid air
cWarm front, clouds, low pressure, high slevation
D Low pressure, warm temperature, warm ocean waters, spiraling winds
Scientists use the chemical and physical properties of matter to differentiate substances. Which of the following is a chemical property?
(A) A starch sample turns blue when introduced to iodine
(B) Gold's property of malleability allow it to be shaped into a ring.
(C) Salts exhibit electrical conductivity.
(D) A metal is identified by its density.
Answer:
a.) A starch sample turns blue when introduced to iodine
Explanation:
A is a chemical change whereas the other answers would be physical changes.
The chemical property has been the turning of the iodine blue with starch introduction. Thus, option A is correct.
The substance properties can be differentiated as Physical properties and chemical properties. Physical properties can be defined as the properties that do not lead to the change in the chemical composition of the compound, For example, electrical conductivity, malleability, density, etc.
The properties of the compound that have been led to the change in the chemical composition of the compound have been termed chemical properties. For example. burning, reduction, etc.
Since the starch sample has been reacted with iodine there has been a chemical change that leads to the product of blue color. Thus, the starch turning iodine blue has been the chemical property. Thus, option A is correct.
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