Answer:
Cu2O
Explanation:
We get mass of Cu and O in copper oxide.
Cu = copper
O = Oxygen
Cu = 7.298g
Then the mass of o is given as
CuO - Cu
= 8.217 - 7.298
= 0.919g
Then we get the number of moles
n = m/M
m = mass
M = molar mass
M of Cu = 63.55g/mol
M of oxygen = 16g/mol
n(copper) = 7.298/63.55
= 0.1148mol
n(oxygen) = 0.919/16g
= 0.0574mol
From here we get the molar ratio
n(copper)/n(oxygen)
= 0.1148/0.0574
= 2/1
Cu:O = 2:1
Cu2O is therefore the formula of copper Oxide
Which statement applies only to magnetic force instead of both electric and
magnetic forces?
A. It can push objects apart.
B. It can pull objects together.
C. It acts between objects that do not touch.
D. It acts between a north pole and a south pole.
SUBMIT
Part B
With the slope being 1.50, with the points passing through points(0,3) and (4,9). What is the value of b?
The value of b : 3
Further explanationGiven
slope=m=1.5
points (0,3) and (4,9)
Required
The value of b
Solution
the Equation of a Line : y = mx + b
m = slope
b = constant
Find the slope :
m = (y₂-y₁)/(x₂-x₁)
m = (9-3)/(4-0)
m = 6/4
For the point that the line passes through : (0,3) then the equation :
3=6/4.0+b
3=b
And the equation :
y = 6/4x+3
Which of the following best describes an alkali?
A. Any substance with a pH above 7.
B. A soluble solid that forms H+ ions in a solution.
C. A soluble solid that has a pH above 7.
D. An insoluble solid that forms OH-ions in a solution.
Answer:
A. Any substance with a pH above 7.
Explanation:
On the pH scale substances whose value is greater than 7 and less than 14 are termed alkali.
Acids have a pH of less than 7 whereas neutral compounds such as water has pH of 7.
An alkali is any substance that produces excess hydroxyl ion in solutions. Water soluble bases are known as alkali. They are usually certain metallic oxides, metallic hydroxides and aqueous ammonia.Answer:
C A soluble solid that forms H+ ions in a solution
Explanation:
founders ed
A certain type of decorative lamp contains colored liquids from globs that break off and rise to the top of the liquid.the globs rise due to
Answer:
Convection.
Explanation:
Due to the heat of the lamp, the liquid increases its temperature. This increase produces an increase in the energy and volume of the globs. But it also causes a decrease in the density of the bubble. As a result, they break off and rise to the top. We can see that the globs rise owing to convection because there is a transfer of heat in the fluid caused by the movement of the fluid's molecules with more energy towards the surface, where the molecules have less energy and are colder.
How is fluorine purified so that it is stable? If this is the same as how it was first purified, then state that it is.
Answer:
it is the same way it is purified in the state
Please help with this assignment!
Answer:
im pretty sure 18 is eye
Explanation:
What relationships between temperature and viscosity of water?
Answer:
As the temperature heats up then the viscosity is much higher, as defined in stress analysis and fluid mechanics. Reynolds number describes the speed and the inverse proportion.
A mixture is made by combining 1.49 lb of salt and 3.82 lb of water.
What is the percentage of salt (by mass) in this mixture?
Answer:
28%
Explanation:
concentration=(solute mass/solution mass)*100
C=concentration
md-solute mass
ms-solution mass
the solution mass is equal to the sum of the solute and solvent mass
ms=3.82+1.49=5.31lb
c=1.49/5.31 * 100=0.28*100=28%
A certain chemical reaction 444 kj releases of heat energy per mole of reactant consumed. Suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). It takes of heat energy to raise the temperature of this calorimeter by . Now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by . How would you calculate the number of moles of reactant that were consumed
Complete question is;
A certain chemical reaction 444 kj releases of heat energy per mole of reactant consumed. Suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). It takes 4.68 J of heat energy to raise the temperature of this calorimeter by 6.9 °C. Now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by . How would you calculate the number of moles of reactant that were consumed
Answer:
7.27 × 10^(-5) moles
Explanation:
We are given;
Heat energy = 444 kJ/mol
Final Temperature = 6.9 °C
Heat capacity = 4.68 J/°C
Let's calculate the heat generated from the formula;
Heat generated = heat capacity × final temperature
Heat generated = 4.68 × 6.9 = 32.292 J = 32.292 × 10^(-3) KJ
Now, the number of moles of reactant that were consumed is gotten from;
No_ of moles of rctnt consumed = heat energy generated/heat energy used = (32.292 × 10^(-3))/444 = 7.27 × 10^(-5) moles
A chemist must prepare 575.mL of 1.00M aqueous sodium carbonate Na2CO3 working solution. He'll do this by pouring out some 1.58M aqueous sodium carbonate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the sodium carbonate stock solution that the chemist should pour out. Round your answer to 3 significant digits.
Answer : The volume in mL of the sodium carbonate stock solution is 364 mL.
Explanation :
According to dilution law:
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of aqueous sodium carbonate
[tex]M_2[/tex] = molarity of aqueous sodium carbonate stock solution
[tex]V_1[/tex] = volume of aqueous sodium carbonate
[tex]V_2[/tex] = volume of aqueous sodium carbonate stock solution
Given:
[tex]M_1[/tex] = 1.00 M
[tex]M_2[/tex] = 1.58 M
[tex]V_1[/tex] = 575 mL
[tex]V_2[/tex] = ?
Now put all the given values in the above formula, we get:
[tex]1.00M\times 575mL=1.58M\times V_2[/tex]
[tex]V_2=363.92mL\approx 364mL[/tex]
Therefore, the volume in mL of the sodium carbonate stock solution is 364 mL.
Which statement describes a similarity between asexual reproduction and sexual reproduction?
A.) Both processes involve fertilization.
B.) Both processes involve cell division.
C.) Both processes produce genetically identical offspring.
D.) Both processes require two parents.
Answer:
the answer to the question is B!
What volume of carbon dioxide gas at STP is required to produce 456.9g of lithium carbonate? PLEASE EXPLAIN HOW YOU GOT THE ANSWER
Answer:
V = 138.68 L
Explanation:
Given data:
Volume of CO₂ at STP required = ?
Mass of lithium carbonate produced = 456.9 g
Solution;
Chemical equation:
2LiOH + CO₂ → Li₂CO₃ + H₂O
Number of moles of Li₂CO₃ produced:
Number of moles = mass/molar mass
Number of moles = 456.9 g/ 73.89 g/mol
Number of moles = 6.184 mol
now we will compare the moles of Li₂CO₃ with CO₂ from balanced chemical equation to get number of moles of CO₂ reacted.
Li₂CO₃ : CO₂
1 : 1
6.184 : 6.184
Thus, 6.184 moles of CO₂ reacted.
Volume of CO₂:
PV = nRT
R = general gas constant = 0.0821 atm.L /mol.K
1 atm × V = 6.184 mol ×0.0821 atm.L /mol.K × 273.15 K
V = 138.68 atm.L / 1 atm
V = 138.68 L
How many moles of dinitrogen tetroxide (N2O4) are in 6.49 x 109 particles?
1.08 x 10–14 mol N2O4
3.091 x 1033 mol N2O4
6.02 x 1023 mol N2O4
1.08 x 10–23 mol N2O4
Newton's third law states that for every action, there is an ______ and ____ reaction force and that forces come in ____
Answer:
Newton's third law of motion states that every action, there is an equal and opposite reaction force and that forces come in pairs
A substance joined by this type of bond will conduct electricity when in?
Answer:
C.) If the solid is conductive, the bonds are metallic.
1) Substances with ionic bond conduct an electric current in liquid, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.
2) Substances with covalent bond not conduct an electric current in liquid and solid state, because they not have free ions or electrons.
3) Substances with metallic bond conduct an electric current in liquid and solid state, because they have mobile electrons. Most metals have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.
Explanation:
Someone please help me
Answer:
ELECTROMAGNETIC MICROSCOPEExplanation:
I HOPE IT HELPS :)
What is the probability of having major earthquakes or volcanoes occur in New York State?
Answer:
New York City is susceptible to at least a magnitude 5 earthquake once every 100 years.
Explanation:
The probability of having major earthquakes or volcanoes occur in New York State is at least, one magnitude 5 earthquake can occur in New York City once every 100 years.
What is earthquakes ?When two chunks of the ground abruptly slide past one another, an earthquake results. The fault or fault plane is the area where they slide.
Earthquakes often result from subsurface rock breaking unexpectedly and fast movement along a fault. The seismic waves that cause the ground to tremble are brought on by this quick release of energy.
The Circum-Pacific Belt, often known as the Ring of Fire, is a region in the Pacific Ocean marked by active volcanoes and frequent earthquakes. The Ring of Fire is where most of Earth's earthquakes and volcanoes occur.
Thus, at least, one magnitude 5 earthquake can occur in New York City once every 100 years.
To learn more about earthquakes, follow the link;
https://brainly.com/question/1176195
#SPJ2
25.1 g express as an integer
Answer:
25 g
Explanation:
Integers are positive or negative whole numbers together with zero. This definition implies that 25.1 g is not an integer.
Seeing that .10 is less than .50, we have to round 25.10 down to 25.
Hence, if i express 25.10g as an integer, i end up with 25 g
I NEED THIS TODAY, PLEASE HELP.
Write the following elements in decreasing ionic size. Li+, C4+, F-, O2-
70 POINTS
Answer:
Li+, C4+, O2-, and then F- They're written in decreasing ionic size.
Explanation:
Ionic size means the same thing as ionic radius. Furthermore, Ionic radius is the distance away from the central atom. Ionic radius increases going from top to bottom and decreases across the periodic table.
Lithium is in the 1st family/group with a charge of +1. So it has the biggest ionic radius.
Carbon is in the 4th family/group with a charge of +4. So it has a smaller ionic radius than Lithium.
Oxygen is in the 6th family/group with a charge of -2. So it has a smaller ionic radius than Carbon.
Lastly, Fluorine is in the 7th family/group with a charge of -1. So it has a smaller ionic radius than Oxygen.
The Density of pure carbon in Diamond form is 3.52 g/cm^3. How many cubic inches would 23.7 moles of pure diamond occupy?
Answer : The volume of pure diamond is [tex]0.493inch^3[/tex]
Explanation : Given,
Density of pure carbon in diamond = [tex]3.52g/cm^3[/tex]
Moles of pure diamond = 23.7 moles
Molar mass of carbon = 12 g/mol
First we have to calculate the mass of carbon or pure diamond.
[tex]\text{ Mass of carbon}=\text{ Moles of carbon}\times \text{ Molar mass of carbon}[/tex]
Molar mass of carbon = 12 g/mol
[tex]\text{ Mass of carbon}=(23.7moles)\times (12g/mole)=284.4g[/tex]
Now we have to calculate the volume of carbon or pure diamond.
Formula used:
[tex]Density=\frac{Mass}{Volume}[/tex]
Now putting all the given values in this formula, we get:
[tex]3.52g/cm^3=\frac{284.4g}{Volume}[/tex]
Volume = [tex]80.8cm^3[/tex]
As we know that:
[tex]1cm^3=0.061inch^3[/tex]
So,
Volume = [tex]0.061\times 80.8inch^3[/tex]
Volume = [tex]0.493inch^3[/tex]
Therefore, the volume of pure diamond is [tex]0.493inch^3[/tex]
Helppppppppppppppppp
Answer:
0.028578 km
Explanation:
The following data were obtained from the question:
Length of whale (in mm) = 28578 mm
Length of whale (in km) =?
We can convert 28578 mm to km by doing the following:
Recall:
1 mm = 1×10¯⁶ Km
Therefore,
28578 mm = 28578 mm × 1×10¯⁶ Km / 1 mm
28578 mm = 0.028578 km
Thus, 28578 mm is equivalent to 0.028578 km
The length of whale (in km) = 0.028578 km
18. Describe cementation
Studying the decay of radioactive isotopes in dead organisms helps scientists to identify fossilized remains. The ratio of C-12 to C-14 in the atmosphere is 1 x 1012. The table shows this ratio inside the body of three organisms.
C12/C14 Ratio
Organism C12/C14 Ratio
X 8 x 1012
Y 2 x 1012
Z 1 x 1012
What can most likely be concluded from the above information?
Only Organism Z is alive, and Organism X has been dead longer than Organism Y.
Only Organism Z is alive, and Organism Y has been dead longer than Organism X.
Only Organism X is alive, and Organism Y has been dead longer than Organism Z.
Only Organism X is alive, and Organism Z has been dead longer than Organism Y.
Answer:
Only Organism Z is alive, and Organism X has been dead longer than Organism Y.
Explanation:
After the death of an organism, there is radioactive disintegration of C-14 allotrope of carbon, which increases the ratio of C-12 to C-14 in a dead organism as compared to a living organism.
The study of chemistry and its bond is called chemistry.
The correct answer is A
After the death of an organism, there is radioactive disintegration occurs which leads to the breakdown of C-14 allotrope of carbon into the other isotopes,
Breakdown of these isotopes leads to the increase in the ratio of C-12 to C-14 in a dead organism as compared to a living organism.
Hence, the correct answer is A that is Only Organism Z is alive, and Organism X has been dead longer than Organism Y.
For more information, refer to the link:-
https://brainly.com/question/12985618
how does the electron configuration of sulfur end
A molecular compound has the empirical formula XY2. Which of the following is a
possible molecular formula?
A.X2Y8
B.ХЗҮЗ
C.X2Y4
D.ХЗҮ9
Answer: C.X2Y4
Explanation:
Given that :
Compound has the empirical formula :
Empirical formula : CY2
The empirical formula expresses in Lowest term the whole ratio of the compound.
.
Empirical. Formula is usually written as :
XnYn+1
For instance, the ratio of the compound is :
n : n+1
Therefore, in the question:
XY2
Ratio :
X = 1 ; Y = 2 ; 1 /2 ;hence, the possible molecular number :
The possible moleculars are those whose XY mole ratio is 1 : 2
Comparing the ratios :
X2Y8 = 2/8 = 1 :4
ХЗҮЗ = 3/3 = 1 : 1
X2Y4 = 2 /4 = 1: 2
ХЗҮ9 = 3/9 = 1 :3
Hence, the only possible molecular formula is X2Y4
Is it easier for an atom to lose a proton or a neutron?why or why not
will brain list
Answer:
No
Explanation:
It is not easier for an atom to lose a proton or a neutron because these particles are held together by very strong nuclear forces within the atom.
Protons are positively charged particles
Neutrons do not carry any charges.
In the nucleus of an atom, both protons and neutrons can be found.
As with both particles, the very strong attractive force makes them very difficult to remove in ordinary chemical reactions.
Nuclear forces are one of the strongest forces that keeps an atom especially the nucleus together. Only in nuclear reactions to we encounter a situation where nuclear materials are changed, in that regard the properties of the atom also changes.
Reaction: 2 N20 --> 2 N2 + O2, how many moles of nitrogen gas will be
produced when 9.84 moles of dinitrogen monoxide decomposes?
Answer:
Number of moles of nitrogen gas = 9.84 mol
Explanation:
Given data:
Number of moles of nitrogen gas = ?
Number of moles of dinitrogen monoxide = 9.84 mol
Solution:
Chemical equation:
2N₂O → 2N₂ + O₂
Now we will compare the moles of N₂O and N₂
N₂O : N₂
2 : 2
9.84 : 9.84
Please help!!! I’ll mark brainlist
what is the chemical formula for hydrogen phosphate
Answer:
Explanation:
The chemical formula for hydrogen phosphate is HPO₄²⁻
Air resistance prevents the driver from moving in a straight line once she jumps from the platform.
True or False
Answer:
true
Explanation: