Answer:
C, A pulley that lifts an elevator off the ground
Explanation:
Basically, it's just easier than a human doing it because that would probably be too much work for humans.
Answer:
C
Explanation:
which of the following elements is the most reactive between boron, sulfur, and chlorine
Answer:
Chlorine would be the answer
Explanation:
Calculate the number of atoms in a 3.31 x 10 g sample of lithium.
g
Explanation:
atomic mass of Li = 7 amu
so we know that there are about (33.1)/7 = 0.47 mol
Multiply this by 6.02 * 10^23 particles per mol, and we get about 2.83 * 10^23 particles
A sample of Ne gas occupies 0.220L at 0.86 atm. What will be its volume at 29.4kPa?
Answer:
0.66 L
Explanation:
Here it's given that a sample of Neon occupies a volume of 0.220 L at 0.86 atm . And we need to find out its volume at 29.4 kPa .
If we assume temperature to be constant , then we can apply Boyle's Law , which states that ,
" For a fixed amount of gas at constant temperature , pressure is inversely proportional to the volume . "
Mathematically ,
[tex] P \propto \dfrac{1}{V}[/tex]
Taking k as constant ,
[tex] P =\dfrac{k}{V}[/tex]
And we can say that ,
[tex] P_1 V_1 = P_2V_2[/tex]
Here ,
P_1 = 0.87 atm P_2 = 29.4 kPa = 29400 PaAs we know that ,
[tex] 0.987 atm = 10^5\ Pa [/tex]
So ,
[tex] 29400 Pa = 0.29 \ atm [/tex]
V_1 = 0.220 L V_2 = ?So that ,
[tex] (0.87 atm )(0.220L) = (0.29atm)(V_2)\\[/tex]
[tex] V_2 = \dfrac{0.87 \times 0.220}{0.29} L [/tex]
Simplify ,
[tex] V_2 = 0.66\ L [/tex]
Hence the new Volume of the gas is 0.66 L .
I hope this helps.
How do you figure out molality
Need Help ASAP Please! The Answer Needs To Be Numerical
A student ran the following reaction in the laboratory at 546 K:
COCl2 (g) CO (g) + Cl2 (g)
When she introduced 0.723 moles of COCl2 (g) into a 1.00 liter container, she found the equilibrium concentration of Cl2 (g) to be 3.38×10-2 M.
Calculate the equilibrium constant, Kc, she obtained for this reaction.
Kc =
This problem is providing an equilirium reaction with the initial concentration of COCl2 and the equilibrium concentration of Cl2 for us to calculate the equilibrium constant. At the end, the result is 0.00166.
Chemical equilibriumIn chemistry, not all chemical reactions turn out into completion yet reach a point of constant concentrations (conversion) called equilibrium. In such a way, since this problem is based on this phenomenom, we can start by setting up the equilibrium expression:
[tex]Kc=\frac{[CO][Cl_2]}{[COCl_2]}[/tex]
Where each concentration is at equilibrium. Now, since all these species are in 1:1 mole ratio, we can see that the cocentration that changed up to equilibrium is 3.38×10⁻² M (Cl2's concentration), and thus we can calculate Kc with:
[tex]Kc=\frac{(3.38x10^{-2}M)(3.38x10^{-2}M)}{(0.723M-3.38x10^{-2}M)}\\\\Kc=0.00166[/tex]
Learn more about chemical equilibrium: https://brainly.com/question/26453983
Which statement correctly describes a reaction in dynamic equilibrium?
o At dynamic equilibrium, the reactions stop and the amounts of reactants and products do not change.
o At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.
o At dynamic equilibrium, the reactions stop but the amounts of reactants and products are changing.
o At dynamic equilibrium, the reactions continue and the amounts of reactants and products are changing.
Answer:
"At dynamic equilibrium the reactions continue but the amounts of reactants and products do not change." would be the correct description
Explanation:
Dynamic equilibrium occurs when the rates of change and concentration are the same, so the reaction still takes place, but the amounts of reactants and products stay the same without any change.
According to chemical equilibrium, the statement which correctly describes dynamic equilibrium is that at dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.
What is chemical equilibrium?Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.
At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.
Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.
Learn more about chemical equilibrium,here:
https://brainly.com/question/8983535
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Two escalators move people up and down between floors of a shopping mall at the same rate, either up or down. What of the following statements regarding the motion of escalators is true?
Answer:
Velocity can vary when speed is constant
why do we measure the mass of ten pennies instead of the mass of one penny ?
What is the mass of an object that has a volume of 12cm3 and a density of 1.5g/cm3
Answer:
18g
Explanation:
D=m/v
D= Density (g/mL) OR (g/cm^3)
m= mass (g)
v= volume (mL)
Use the Desity formula to find the mass by rearranging the formula so that m = D*v
Simply multiply the density by the volume
1.5*12 =18g
because it is the mass you’re looking for.
How many kilocalories of heat are needed to melt 65.0 g of ice at 0 °C?
Answer:
21.7 kj
Explanation:
The heat required to change the phase of a matter is calculated by using the latent heat formula, Q=ML, where M is the mass released or absorbed during the phase change and L is the latent heat of a material. Since ice is melted into water, this process is technically called the heat of endorthermic phase change that is Q_in=ml
The latent heat of water is 334 kg/kj. In order to melt 65. 0g of ice Q=0.065 x 334kj/kg =21.71 of heat required
Describing types of chemical bonds Match each bond with the rearrangement of the valance electrons needed to form that bond metallic bond ionic bond covalent bond sharing of electrons sharing of many electrons transferring of electrons
Answer:
metallic bond —> sharing of many electrons
covalent bond —> sharing of electrons
ionic bond —> transferring of electrons
Explanation:
im not 100% sure this is right but i hope it still helps!
A method of calculating the amounts of reactants needed to produce desired amounts of products is called
When 3 moles of nitrogen monoxide are formed, how many moles of oxygen reacted?
4 NH3(g) + 5O2 (g) 4 NO (g) + 6 H2O (1)
->
Answer:
3.75
Explanation:
it's gonna be a decimal number,cus from the formula 5moles produce 4moles of NO
so if 3 moles we're to be produced,it will be 3x5 divide by 4
is NO2 an ionic or covalent bond? Will give brainliest for the correct answer
Answer:
Covalent
Explanation:
hi, How are you?
NO2 is already polar, due to the fact that nitrogen shares a maximum of 3 electrons. Thus N makes two covalent bonds with one oxygen, one covalent and one dative with the other. And there's still a free electron left that causes the molecule to bend, forming an angle, and so the NO2 molecule is polar with an angle other than 180.
Please please helppp
Answer:
is that geography because that is my favourite subject... I can help
The volume occupied by 9 x 1023 molecules of nitrogen gas at STP is closest to
1.5 L
22.4 L
33.6 L
0.5 L
This problem is providing the number of molecules of nitrogen at STP and asks for the volume they take up. At the end, the result turns out to be 33.6 L according to the following.
Avogadro's lawIn chemistry, gas laws are used to relate pressure, temperature, volume and moles as an indicator of the behavior of gases. Thus, since this problem provides the number of molecules of nitrogen gas at STP, standard pressure and temperature (1atm and 273K), one knows the Avogadro's law must be utilized.
In such a way, this law allows us to know that 1 mole of any substance is related to 6.022x10²³ particles and that 1 mole of the gas occupies 22.4 L at STP. Hence, we can find the volume with the following setup:
[tex]9x10^{23}molecules*\frac{1mol}{6.022x10^{23}molecules} *\frac{22.4L}{1mol} \\\\=33.5L[/tex]
Which can be rounded then to 33.6 L.
Learn more about ideal gases: brainly.com/question/8711877
Please help!
Fe2O3 + C → CO + Fe
Is Sodium bicarbonate (NaHCO3) held together through ionic or covalent bonds? Explain your reasoning.
Answer:
No
Explanation:
No
Sodium bicarbonate is an Ionic compound.
Sodium bicarbonate, also known as baking soda, is considered an ionic compound, not a covalent compound.
why are atoms so picky on who they bond with
Explanation:
Atoms are not really picky. They actually bond with other atoms to form an octect state. Let's take an example of an atom with, say, 2 valence electrons. This atom will have to bond with an atom which has 6 valence electrons to reach its octect state (6 + 2 = 8 =》 octect state is from L shell and above).
Hope it helps ⚜
Are oceans like giant swimming pools are they connected
Answer and Explanation:
Oceans are like giant swimming pools for marine life. Not really for people though. One difference that most swimming pools tend to have chlorine in them. If not, then they have salt water similar to an ocean. The chemical substance chlorine is not good for marine life at all, and isn't really good for people either.
But instead of chlorine, oceans have types of bacteria that aren't good for people either, especially if ingested in high amounts. So, if you've ever accidentally swallowed sea water and felt a little sick to your stomach, this could be why. They are similar though because they both have water and a form of bacteria.
They are not connected in a way of cycling water with each-other, but they do have similarities and differences as I had mentioned before.
Let me know if you have any more questions about this topic, I hope that this helps.
If a water fountain has an average flow rate of 0.64 gallons per minute, how many
seconds does it take to dispense 842.75 mL. (Hint: 3.78541 L = 1 gal, 60 s = 1 min)
The time taken for the water fountain to dispense 842.75 mL of water is 20.625 seconds
What is time?Time can be defined as the measure of past, present or future events.
To calculate the time taken to dispense 842.75 mL of water, we use the formula below.
Formula:
F = V/t................ Equation 1Where:
F = Average flow rate of the fountainV = Volume of the watert = time.Make t the subject of the equation.
t = V/F................ Equation 2From the question,
Given:
F = 0.64 gallons per minutesV = 842.75 mL = (842.75/1000)/(3.78541) gal = 0.22 gal.Substitute these values into equation 2
t = 0.22/0.64t = 0.34375 minutes.t = (0.34375×60) = 20.625 seconds.Hence, The time taken for the water fountain to dispense 842.75 mL of water, is 20.625 seconds.
Learn more about time here: https://brainly.com/question/13893070
how does sulfur bond with chlorine
Sulfur and chlorine are both on the "right side" of the periodic chart. Therefore they are both nonmetals. Nonmetals will react with each other and form covalent bonds.
what is non electrlyte
The volume of a container increases from 5L to 9L. What is the final pressure if the original pressure was 11 atm
Answer:
6.11 atm
Explanation:
P1V1=P2V2
(11)(5) = (P2)(9)
55/9 = 6.11 atm = P2
Describe the relationship between the mole and molar mass. Be prepared to describe the process for converting between moles and molar mass.
Answer:
The molar mass of any substance is the mass in grams of one mole of representative particles of that substance. ... In such a conversion, we use the molar mass of a substance as a conversion factor to convert mole units into mass units (or, conversely, mass units into mole units).
Explanation:
Answer:
conversion factor to convert mole units into mass units
Explanation:
thats the answer, ur welcome!!!!
A chemist prepares a solution of iron(II) bromide (FeBr2) by measuring out 46. g of iron(II) bromide into a 400. mL volumetric flask
and filling the flask to the mark with water.
Calculate the concentration in mol/L of the chemist's iron(II) bromide solution. Round your answer to 2 significant digits.
Solution
Given mass of FeBr2 = 85.5 g
Molar mass of FeBr2 = 215.65
No. of Moles of FeBr2 = Given Mass / Molar mass = 85.5 / 215.65
No. of Moles = 0.3964
Given Volume is 450 mL i.e. 0.450 L
Now Concentration = 0.3964/0.450
Hence Concentration = 0.881 mol/L
A bike moves with a speed of 40 km/h for 1 h and then with a speed of 60 km/h for the next 2 h. What is the total distance covered by the bike during the complete journey?
Answer:
40×1=40
60×2=120
40+120=160
will mark as brainliest if correct
Answer:
A) The bonds of the reactants must be broken
D) The bonds of the products must be formed
E) Breaking bonds require an input of energy
H) Forming bonds releases energy
These are all the 4 correct statements
Explanation:
Breaking bonds is an ENDOTHERMIC process, meaning that it takes in energy to break the bonds of the reactants.
Forming bonds is an EXOTHERMIC process, meaning that it takes in energy to break the bonds of the reactants.
Fe2+(s) + Cr6+(aq) → Fe3+(aq) + Cr3+(aq)
Which element is being reduced?_______
Which element is being oxidized?_______
Which reactant is the reducing agent?_______
Which reactant is the oxidizing agent?_______
Explanation:
A. Cr reduced
B. Fe oxidized
C. Fe reducing agent
D. Cr oxidizing agent
[tex]ok \: here \: is \: your \: answer \: [/tex]
1) Cr is being reduced.
2) Fe is being oxidized.
3) Fe is the reducing agent.
4) Cr is the oxidizing agent.
What is the position of the earth, moon, and sun during a new moon?
Answer:
In the case of a New Moon, the Moon is between Earth and the Sun, so the side of the Moon facing the Sun isn't facing us. We can't see any portion of the lit-up Moon during this phase. (When the Sun and Moon exactly line up, as viewed from Earth, we get a special experience known as a solar eclipse
Explanation:
good luck hope this helps