Answer:
uR making us work hard for this and yet all u give is 5 points
An ore sample is found to contain 10.500000 g of cobalt and 87.3 g waste rock (gangue). What is the
percent by mass of cobalt in the ore?
Answer:
[tex]\% Co=10.7\%[/tex]
Explanation:
Hello!
In this case, since this is a mixture composed by cobalt and waste rock, we can compute the percent by mass of cobalt as shown below:
[tex]\% Co=\frac{m_{Co}}{m_{Co}+m_{waste}} *100\%\\\\[/tex]
Thus, we plug in to obtain:
[tex]\% Co=\frac{10.500000g}{10.500000g+87.3} *100\%\\\\\% Co=10.7\%[/tex]
Best regards!
Most of Earth's major earthquakes are caused by
x
seasonal heating and cooling of Earth's surface
B
x
weathering of rock at Earth's surface
C
x
earth's gravitational attraction to the Moon
D
x
faulting of rock in earth's crust
Answer:
d
When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel.
Which two formulas are used to calculate potential and kinetic energy?
Answer:
[tex]\boxed{\bold { \large { \boxed {KE=\frac{1}{2} mv^2 \ , \ PE=mgh}}}}[/tex]
Explanation:
Kinetic energy formula
[tex]\displaystyle KE=\frac{1}{2} mv^2[/tex]
Potential energy formula
[tex]\displaystyle PE=mgh[/tex]
[tex]\displaystyle KE \Rightarrow \sf kinetic \ energy \ (J)[/tex]
[tex]\displaystyle PE \Rightarrow \sf potential \ energy \ (J)[/tex]
[tex]\displaystyle m \Rightarrow \sf mass \ (kg)[/tex]
[tex]\displaystyle v \Rightarrow \sf velocity \ (m/s)[/tex]
[tex]\displaystyle g \Rightarrow \sf acceleration \ of \ gravity\ (m/s^2)[/tex]
[tex]\displaystyle h \Rightarrow \sf height \ (m)[/tex]
Day 1 code word for science?
Answer:
hail Hydra kandksmak Yes
The representative particle for NaF
Answer:
Na2S, it is the formula unit
Explanation:
The representative particle of CO2 is the molecule, while for Na2S, it is the formula unit
A substance has a mass of 22g and a volume of 13cm3. What is the density of the
substance? *
Answer:
1.69 g/cm³
Explanation:
Mass (m) = 22 g
volume (v) = 13 cm³
density (d) = ?
we know density is defined as mass per unit volume
d = m/v
= 22 / 13
= 1.69 g/cm³
Hope it will help :)
can someone tell me the answer and how to do the problem?
Answer:
is tht wht u want
Explanation:
1 grams Sodium is equal to 0.043497607849056 mole.
Which has a greater volume, 100mL of alcohol or 100mL of water? Prove your answer.
Answer water
Explanation:
Solder is a silver metal used to hold pipes together. When the solder is heated, it melts and acts as a type of metal "glue." Mrs. Hanley heats a piece of solder until it melts between two pipes. What best identifies the point at which a physical change first takes place?
A)when the solder melts
B)when the solder cools down
C)when the solder is a soft metal
D)when the solder becomes solid again
Answer:
A
Explanation:
A hot air ballon will rise in air because:
Answer: C
Explanation:
Hot air is a lot less dense for a few reasons. Hot air essentially means the particles have more kinetic energy, and move around a lot more. Cold air is dense because the particles move a lot less, have less energy, and are closer together.
Answer:
A
Explanation:
Since the balloon itself is heavier than air, it must be filled with a large volume of something much lighter—either hot air or a very light gas, such as helium. Because the combined weight of the balloon and the gas is less than the weight of an equal volume of surrounding air, the balloon rises.
In this case you have unlimited iron, but only 6.40 moles of oxygen (O2). How much Fe2O3 can you produce?
Answer: 682 grams
Explanation:
The balanced chemical reaction is:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
[tex]O_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Fe[/tex] is the excess reagent.
According to stoichiometry :
3 moles of [tex]O_2[/tex] produce = 2 moles of [tex]Fe_2O_3[/tex]
Thus 6.40 moles of [tex]O_2[/tex] will produce=[tex]\frac{2}{3}\times 6.40=4.27moles[/tex] of [tex]Fe_2O_3[/tex]
Mass of [tex]Fe_2O_3=moles\times {\text {Molar mass}}=4.27moles\times 159.69g/mol=682g[/tex]
Thus 682 g of [tex]Fe_2O_3[/tex] will be produced from 6.40 moles of oxygen
How many atoms are in 4.36 moles of copper ?
Answer:
Moles of Cr in 4.36×1023 atoms of Cr?
I mass of Cr = 52.00
A's# = 6.02x10^23
I don't know how to approach this. Help?
Update:
Moles of Cr in 4.36×10^23 atoms of Cr?
Update 2:
ALSO......
moles of Cu in 9.7×10^21 atoms of Cu?
moles of C2H6 in 2.75×10^23 molecules of C2H6?
Explanation:
When some solid ammonium nitrate was dissolved in water the temperature decreased from 22 oC to 3 oC. What can be deduced from this observation?
The dissolving is endothermic and ∆H is positive. The dissolving is endothermic and ∆H is negative. The dissolving is exothermic and ∆H is positive. The dissolving is exothermic and ∆H is negative.
Which is a correct statement about an endothermic reaction?
A. The bonds in the reactants are stronger than in the products and ∆H is positive.
B. The bonds in the products are stronger than in the reactants and ∆H is positive.
C. The bonds in the reactants are stronger than in the products and ∆H is negative
D. The bonds in the products are stronger than in the reactants and ∆H is negative.
Which is a correct statement about the following() enthalpy level diagram of a reaction? A. The reaction is exothermic and △H is positive.
E. The reaction is exothermic and △H is negative.
F. The reaction is endothermic and △H is positive.
G. The reaction is endothermic and △H is negative.
Which statements are correct for all exothermic reactions?
I. The products are more stable than the reactants.
II. The bonds in the products are stronger than the bonds in the reactants
III. The enthalpy of the products is less than the enthalpy of the reactants
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Answer:
1. The dissolving is endothermic and deltaH is positive
2. A. The bonds in the reactants are stronger than in the products and deltaH is positive
3. I can't see the diagram so I don't know the answer (it's a glitch on my part not yours, my school district blocks images automatically on their rented chromebooks)
4. A. I, and II only
Explanation:
When we measure the temperature of a solution, and we notice that the temperature of the water is decreasing, then this is an endothermic reaction..
The dissolved solute (the "invisible" ions) are absorbing the heat, causing the water around it to be colder.. **Heat moves from hot to cold, so the water is losing it's heat and the dissolving (dissolved solute) is gaining heat, meaning that it is Endothermic.
When a reaction is endothermic, the energy that is required to break bonds and attractive forces is greater than the energy required to form bonds and attractive forces. This means that the bonds in the reactants are stronger than in the products and deltaH is positive. Since we know that the energy in the reactants is greater, there is more heat in the reactants. This is also why the dissolved solute would be gaining heat.. If the energy of the reactants is stronger, when it breaks, it will release a lot of energy that the dissolved solute will be absorbing.
Think, heat (q, released or absorbed) is measured in Joules, the higher the Joules, the hotter something will be. So, if the heat (q) is negative, that represents the amount of Joules (heat) being released. If it is positive, that is the amount being absorbed. So, if heat is being absorbed then deltaH is positive.
If the diagram shows the products being at a higher energy level than the reactants, then the diagram shows an endothermic reaction.. If we see that the energy from the products is greater, than the energy of the system increased as it absorbed energy from its surroundings.
If the diagrams shows the reactants being at a higher energy level than the products, then the diagram shows an exothermic reaction.. Think of it this way, if we see that the energy from the reactants was greater, than the energy of the system was originally greater than the surroundings, but now (observing the products), it is not, as energy was lost to the surroundings, making this an exothermic reaction.
For exothermic reactions, the energy that is required to break bonds and attractive forces is less than the energy required to form bonds and attractive forces.. This means that energy in the products are greater, so as these bonds are broken and energy is released, the surroundings gain energy/heat. This means that the energy is favorable (more stable), the more negative our potential energy (energy of the system) is, the more favorable our process is.
If 0.813 g of O3 reacts with 0.605 g of NO, how many grams of NO2 will be produced?
Answer:
0.74 g O
3
=
48
0.74
=0.0154 mol O
3
0.67 g NO=
30
0.67
=0.0223 mol NO
O
3
is the limiting reagent and NO is in excess =0.0223−0.0154=0.007 mol
Thus, O
3
taken =NO
2
formed =0.0154 mol NO
2
=0.0154×46 g NO
2
Explanation:
All of the following have an OCTET of electrons except
о
S-1
O
N-3
O
Be+2
O
Br-1
Answer:
full octets live in noble gas world so you need to be whatever your charge is away from there in steps on the periodic table so s-1 is the one that falls short as it is 2 moves away from Ar which is its closest Noble gas
Explanation:
If I bought a pen, would this be an irreversible change? Explain why
Answer:
No
Explanation:
it will not be a irreversible change because u can give back the pen if it is in its original state and the shop keeper might accept it back that is what mostly happens. if the pen breaks or is used then it might me called a irreversible change until then it is reversible if not used yet.
thank u
Answer:
No
this is reversible because you can return the pen.
which gas is used in flying balloons ?
Answer:
hydrogen
Explanation:
can i have brainliest please
Writing Prompt/Open-Ended Question
What are limiting reactants? How can you predict how much of a product you will create if you know how much of a reactant you used?
Answer:
If you are given a chemical equation and specific amounts for each reactant in grams, you have to follow these steps, in order, to determine how much product can possilby be made:
1. Convert each reactant into moles of the product.
2. Determine which reactant is the limiting reactant.
3. Convert the moles of product, from the limiting reactant, to grams.
Explanation:
This is IXL pls hurry pls! SOS major
Answer:
the same as
Explanation:
that's what makes the most since to me but i may be wrong
lobal wind patterns have less to do with air temperature than local winds. A True B False
Answer:
False
Explanation:
Depends mostly on heating of the earths surface being uneven
It is false that global wind patterns have less to do with air temperature than local winds.
What is global wind?Local winds are those that blow over a small area. Local geography, such as proximity to an ocean, has an impact on them.
Monsoons and land and sea breezes are among them. Global winds occur in belts all over the world.
Temperature differences, particularly the difference in heating at the equator and poles, and the Earth's rotation determine the global atmospheric circulation pattern.
By transporting heat and water, winds shape regional climate and influence daily weather.
Global winds are winds that occur in belts that circle the globe. Global winds, like local winds, are caused by uneven heating of the atmosphere.
Because of the Coriolis effect, winds blow diagonally across the surface.
Thus, the given statement is false.
For more details regarding global wind, visit:
https://brainly.com/question/8957184
#SPJ2
in terms of electrons, what is the difference between a covalent and ionic bond
Answer:
An ionic bond essentially donates an electron to the other atom participating in the bond, while electrons in a covalent bond are shared equally between the atoms. Ionic bonds form between a metal and a nonmetal. Covalent bonds form between two nonmetals
how does a decrease in potential energy during a chemical rwaction relate to the temperature of the surroundings
Answer: If the potential energy of the reaction system decreases, then kinetic energy in the surroundings increases and the temperature of the surroundings rises
Explanation:
The decrease in the potential energy results in an increase in the temperature of the system and surroundings.
Mechanical energy has been described as the sum of the kinetic and the potential energy in the system. With the increase in the potential energy, there has been a decrease in the kinetic energy and vice versa.
The decrease in the potential energy results in an increase in the kinetic energy of the system. The kinetic energy has been termed as the energy of performing work. The rise in the kinetic energy results in an increase in the work done in the system and there has been an increase in the temperature of the system.
Thus, the decrease in the potential energy results in an increase in the temperature of the system and surroundings.
For more information about the potential energy, refer to the link:
https://brainly.com/question/21288807
When the following molecular equation is balanced using the smallest possible integer coefficients, the values of these coefficients are: sodium chloride (aq) silver nitrate (aq) silver chloride (s) sodium nitrate (aq)
Answer:
1 on each compound there
Explanation:
A balanced reaction is a reaction that has the same number of atoms in the reactants and products. If this number is not the same, we need to balance it putting some numbers as coefficients behind the compound or element that needs to be balanced, For example:
NH₃ ------> N₂ + H₂
As you can see in this reaction, we have 1 nitrogen and 3 hydrogens in the reactants, and in the side of products we have 2 of each element. This needs to be balanced. To do this we put a number as coeffcient to balance the atoms. In this case, we can put a number 2 behind the NH₃, so the number of atoms of nitrogen becomes 2:
2NH₃ ------> N₂ + H₂
But this 2, changes the number of hydrogens, we now have 6 (cause 2 * 3 = 6), so, let's balance hydrogen on the products to be 6, putting a 3:
2NH₃ ------> N₂ + 3H₂
Now, the reaction is balanced in each side of the reaction.
Applying the same principle to the reaction of this exercise we have the following:
NaCl(aq) + AgNO₃(aq) ---------> AgCl(s) + NaNO₃(aq)
As you can see, we have the same number of atoms on each side:
Na: 1; Cl: 1; Ag: 1; N: 1; O: 3
So we don't need to balance this reaction, with just putting the number 1 or none, is perfectly balanced.
Hope this helps
If 5.025 grams of NaOH are dissolved in 2.4 liters of water, what is the Molarity of the solution?
Answer:
0.052 M.
Explanation:
Hello!
In this case, since the molarity is computed by dividing the moles of the solute by the volume of the solution in liters (M=n/V), we first need to compute the moles in 5.025 grams of NaOH as shown below:
[tex]n=5.025g*\frac{1mol}{40.0g}\\\\n=0.126mol[/tex]
In such a way, we compute the molarity as show below:
[tex]M=\frac{0.126mol}{2.4L}\\\\M=0.052M[/tex]
Best regards!
A 18.5 gram sample of metal was added to a graduated cylinder that had
an initial volume of 45.50 mL. The water level raised to 54.10 mL. Using
this information, calculate the density of the metal. *
Answer:
[tex]d=2.15g/mL[/tex]
Explanation:
Hello there!
In this case, since the density of the metal is computed as shown below:
[tex]d=\frac{m}{V}[/tex]
We need to calculate the volume of the solid by subtracting the final volume and the initial volume of water:
[tex]V=54.10mL-45.50mL\\\\V=8.60mL[/tex]
Thus, we obtain:
[tex]d=\frac{18.5g}{8.60mL}\\\\d=2.15g/mL[/tex]
Best regards!
If 0.332 mol of zinc reacts with excess lead(IV) sulfate, how many grams of zinc sulfate will be produced in the reaction?
Answer:
53.6 g
Explanation:
Step 1: Write the balanced equation
2 Zn + Pb(SO₄)₂ ⇒ 2 ZnSO₄ + Pb
Step 2: Calculate the moles of ZnSO₄ produced from 0.332 moles of Zn
The molar ratio of Zn to ZnSO₄ is 2:2. The moles of ZnSO₄ produced are 2/2 × 0.0332 mol = 0.0332 mol.
Step 3: Calculate the mass corresponding to 0.332 moles of ZnSO₄
The molar mass of ZnSO₄ is 161.44 g/mol.
0.332 mol × 161.44 g/mol = 53.6 g
4.) What is atomic number.
Answer: the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Explanation:
Which kingdom contains both unicellular and multicellular eukaryotic organisms?
Animalia
Fungi
Plantae
Bacteria
what is is pls
Radioactive decay follows first-order kinetics. If a sample of I-131 decays from 25.0 mg to 8.25 mg in 12.8 days, what is the rate constant, k?
Answer:
k = 0.0866 days⁻¹
Explanation:
The isotope decay of the atom follows the equation:
ln [A] = -kt + Ln[A]₀
Where [A] is the amount of the isotope after time t = 8.25mg
Time = 12.8days
k is rate constant
[A]₀ is actual amount of the isotope = 25.0mg
Replacing:
ln 8.25mg = -k*12.8days + ln 25.0mg
2.11 - 3.22 = -k*12.8days
-1.11 = -k12.8days
k = 0.0866 days⁻¹
NEED HELP ASPA WILL MAKE THE BRAINIEST ANSWER
A student captures 0.50
moles of hydrogen (H2), oxygen (O2), chlorine (Cl2), carbon dioscide (CO2), and carbon monoxide (CO) gas in separate, evacuated flasks.
Arrange the flasks of gases in order of increasing grams of gas.
.H
H
H2
H2
Answer: [tex]H_2[/tex] < [tex]CO[/tex] < [tex]O_2[/tex] < [tex]CO_2[/tex] < [tex]CL_2[/tex]
Explanation:
According to avogadro's law, 1 mole of every substanceweighs equal to its molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
1. Mass of [tex]H_2=moles\times {\text {Molar mass}}=0.50moles\times 2g/mol=1g[/tex]
2. Mass of [tex]O_2=moles\times {\text {Molar mass}}=0.50moles\times 32g/mol=16g[/tex]
3. Mass of [tex]Cl_2=moles\times {\text {Molar mass}}=0.50moles\times 71g/mol=35.5g[/tex]
4. Mass of [tex]CO_2=moles\times {\text {Molar mass}}=0.50moles\times 44g/mol=22g[/tex]
5. Mass of [tex]CO=moles\times {\text {Molar mass}}=0.50moles\times 28g/mol=14g[/tex]
Thus the flasks of gases in order of increasing grams of gas is:
[tex]H_2[/tex] < [tex]CO[/tex] < [tex]O_2[/tex] < [tex]CO_2[/tex] < [tex]CL_2[/tex]