Na more reactive than Cu
Further explanationGiven
Copper in a solution of NaCl
Required
The displacement theory
Solution
A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds
Not all of these reactions can occur. We can use the activity series, which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.
The voltaic series:
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au
The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)
The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)
Reaction
Cu + NaCl≠
The existing copper element can not replace the sodium element, which is on the left side so the reaction will not occur.
But if it is reversed, then a reaction can occur
2 Na + CuCl2 → Cu + 2 NaCl
List six different branches of science
Answer:
Biology, Chemistry, Geology, Astronomy, physics, Zoology
Answer:
1. biology- the study of living things
2. astronomy- the study of space
3. chemistry- the study of composition, properties and energy change of matter
4. geology- the study of solid earth like rocks
5. ecology- the study of relationship between living things and their environment
6.physics- the study of the structure of matter and the interactions between the fundamental constituents of the observable universe.
Which of these equations is balanced, and which is not balanced? Explain how you can tell.
a) 2C2H6+ 7O2 → 4CO2+ 6H2O
b) 2MgCO3 + H2SO4 → 2MgSO4 + H2O + 2CO2
Answer:
a is balanced
Explanation:
a) reactant/ product
(2x2)=4c / 4c
(2x6)=12h / 12 h
14o / (8o+6o)=14 o
Describe how an electric field is generated.
Answer:
Electric charges produce electric fields
Explanation:
A camper pours 500 g of coffee, initially in a pot at 80 oC, into a 110-g aluminum cup initially at 30 oC. What is the final temperature? Assume that coffee has the same specific heat as water and that no heat is exchanged with the surroundings. (cwater=4.18 J/goC). (cAluminum=0.900J/g.C)
The final temperature : t=77.74 °C
Further explanationGiven
500 g coffee, t = 80 °C
110 g aluminum cup, t = 30 °C
Required
The final temperature
Solution
Q in = Q out
Q absorbed = Q released
Q aluminum cup = Q coffee
110 x 0.9 x (t-30)=500 x 4.18 x (80-t)
99t-2970=167200-2090t
2189t=170170
t=77.74 °C
PLEASE HELP! ILL GIVE BRAINLIEST, EXPLAIN YOUR ANSWER PLS
Answer:
arteries carry blood from the heart to the lungs and veins carry blood from the lungs to the heart
Explanation:
Arteries carry oxygenated blood from the heart, while veins carry oxygen-depleted blood back to the heart. ... The pulmonary veins transport oxygenated blood back to the heart from the lungs, while the pulmonary arteries move deoxygenated blood from the heart to the lungs.)
Iron is a mineral. A nail made out of iron
a mineral.
Answers:
Is also
Is not
Answer:
is also
Explanation:
if iron is a mineral then a nail is a mineral to
Which of the following would exert a gravitational force? (check all that apply) *
A. Sun
B. Earth
C. Moon
D. You
E. a marble
F. light
G. air
H. water
Answer: B. C and A.
Explanation:
Both lowercase letters have to be present for the recessive trait to show.
A. True
B. False
A Bunsen burner usually burns methane gas (CH4) using words, write the chemical equation for this reaction.
The general chemical equation for the complete combustion (or burning) of some hydrocarbon fuel is, in words, as follows:
hydrocarbon fuel and oxygen gas react to produce carbon dioxide gas and water vapor,
or, using chemical notation,
[tex]\mathrm{C_xH_y} + z\mathrm{O_2} \rightarrow \mathit{x}\mathrm{CO_2} + \frac{\mathit{y}}{2}\mathrm{H_2O}[/tex]
where
[tex]z = x + \frac{y}{4}.[/tex]
Don't worry if that looks daunting. In our case, we are given the identity of the fuel (methane, or CH₄), so our equations will be straightforward.
In words: Methane gas and oxygen gas react to produce carbon dioxide gas and water vapor (or methane gas + oxygen gas → carbon dioxide gas and water vapor).
In chemical notation:
[tex]\mathrm{CH_4}_{\text{(g)}} + 2\mathrm{O_2}_{\text{(g)}} \rightarrow \mathrm{CO_2}_{\text{(g)}} + 2\mathrm{H_2O}_{\text{(g)}}.[/tex]
Upon combustion, a compound containing only carbon and hydrogen produces 2.28 gCO2 and 0.702 gH2O. Find the empirical formula of the compound.
Answer:
EF = CH₂
Explanation:
The empirical formula of any compound would be the most simplified and simple chemical formula of a compound. To get this number, we need to get the data of how many moles of each atom of the compoud we have.
Analyzing the data, we just know that an unknown compound undergoes a combustion reaction and produces CO₂ and H₂O. As the compound only have Carbon and hydrogen, it's pretty easy to get the moles of each atom.
To get the moles of CO₂, we need the molar mass of CO₂, which is 44 g/mol, then the moles:
nCO₂ = 2.28 / 44 = 0.0518 moles of CO₂.
Now that we have the moles of CO₂, we can get the moles of Carbon. Since 1 mole of CO₂ is made of 1 mole of Carbon and 2 moles of oxygen, this means that we have 0.0518 moles of C.
Applying the same thing with the water, we have:
nH₂O = 0.702 / 18 = 0.039 moles of water
And 1 mole of water is made of 1 mole of oxygen and two moles of hydrogens, then the moles of Hydrogen are 0.078 moles.
With these moles, we can now calculate the empirical formula.
C = 0.0518 / 0.0518 = 1
H = 0.078 / 0.0518 = 1.51 ≅ 2
Now these two numbers, give us the number of atoms, in the empirical formula so:
EF = CH₂Of course there is no compound that have only those number of atom, but remember that this is the empirical formula, so, it's a simplified or reduced formula of the molecular formula, which means that the real or whole molecular formula could have more atoms of C and H, but to know this, we need the molar weight of this compound, and the problem does not give this data.
Hope this helps
Count the number of bonding pairs and the number of ione pairs around the left chlorine atom
Explanation:
I think
Bonding pairs = 4
Lone pairs around the left chlorine atom = 9
An astronomer studying planets outside our solar system has analyzed the atmospheres of four planets. Which of these planets’ atmospheres would be most able to support a colony of humans? Planet C: 78% Nitrogen, 1% Oxygen, 21% Other Planet B: 82% Nitrogen, 11% Oxygen, 7% Other Planet A: 76% Nitrogen, 23% Oxygen, 1% Other Planet D: 27% Nitrogen, 3% Oxygen, 70% Other
Answer: Planet A: 76% Nitrogen, 23% Oxygen, 1% Other
Explanation: Hope this helps!
An astronomer studying planets outside our solar system has analyzed the atmospheres of four planets. The planets’ atmospheres would be most able to support a colony of humans is Planet A: 76% Nitrogen, 23% Oxygen, 1% Other. Therefore, option C is correct.
What is solar system ?The term solar system is refer to the sun and planets, comets, asteroids and meteors which revolve around the sun to produce the solar system. The sun is the nearest star which is the main source of light for all the planets.
An astronomer studying planets outside our solar system has studied the atmospheres of four planets. The planets’ atmospheres would be most able to support a colony of humans is Planet A: 76% Nitrogen, 23% Oxygen, 1% Other.
Thus, option C is correct.
To learn more about the solar system, follow the link;
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What is matter?
12 points..
Explanation:
matter is a substance that has mass and it takes up space.
hope this helps!!
Predict Note the type of reaction you expect for
reactants Cu and O.
single replacement
double replacement
combustion (and synthesis)
synthesis
decomposition
Answer:
it is a combustion reaction
Answer:
Combustion (and synthesis)
Explanation:
Edge 2021
A metal crystallizes in the face‑centered cubic (FCC) lattice. The density of the metal is 12020 kg/m3, and the length of a unit cell edge, , is 389.08 pm. Calculate the mass of one metal atom in grams.
Answer:
1.7700×10^-22 g
Explanation:
A face-centered-cubic cell contains 4 atoms, so the volume per atom is ...
(389.80×10^-12 m)³/(4 atoms) ≈ 1.4725×10^-29 m³
Then the mass of 1 atom is ...
(12020 kg/m³)(1.4725×10^-29 m³) ≈ 1.76995×10^-25 kg
≈ 1.7700×10^-22 g
_____
Additional comment
That is the approximate mass of a Palladium atom.
Answer:
1.7700×10^-22 g
Explanation:
hii!! need help with this last answer for chem. would appreciate the help. (question 3)
Answer:
1.023 J / g°C
Explanation:
Mass, m = 37.9 g
Temperature increase (change) = 25.0°C
Heat = 969 J
Specific heat capacity , c= ?
The relationship between these quantities is given by the equation;
H = mcΔT
c = H / mΔT
c = 969 / (37.9 * 25)
c = 969 / 947.5 = 1.023 J / g°C
1.25mole Nocl was placed in a2.50l reaction chamber at 427c. After equilibrium was reached .1.10moles of Nocl remained.Calculate the equilibrium constant Kc for the reaction. 2Nocl(g)=2No(g)+cl2(g)
Answer:
Kc → 5.58×10⁻⁴
Explanation:
Equilibrium reaction is:
2NOCl (g) ⇄ 2NO (g) + Cl₂(g)
Initially we have 1.25 moles of NOCl
After the equilibrium, we have 1.10 moles. So, during the process:
(1.25 mol - 1.1 mol) = 0.15 moles have reacted.
As ratio are 2:2, and 2:1, 0.15 moles of NO and (0.15 /2) = 0.075 moles of chlorine, were produced in the equilibrium.
Finally in equilibrium we have: 1.10 moles of NOCl, 0.15 moles of NO and 0.075 moles of Cl₂. But these amount are not molar, so we need molar concentration in order to determine Kc:
1.10 mol /2.50L = 0.44 M
0.15 mol / /2.50L = 0.06 M
0.075 mol /2.50L = 0.03 M
Let's make expression for Kc → [Cl₂] . [NO]² / [NOCl]²
Kc = (0.03 . 0.06²) / 0.44² → 5.58×10⁻⁴
Which compound is impossible?
A. Zns
B. Na2O
C. Ca3P2
D.LiCl2
Plz answer the question in the picture.
Answer:
a
Explanation:
a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Answer:
A digram show mixture
Because mixture is formed by simple mixing of many substances
And figure A shows different substances
Explanation:
N4P10
There are ____________ phosphorus atoms
What coefficients do you need to balance the following equation Rb, P, Rb3P
Answer:
3,1,1 would work
Explanation:
PLS HELP DECOD THIS :(
The planet Superman was born on (also has the atomic number 36): (F3) R (C3) P (H1) (I1) N
Answer:
he was born on planet krypton
What is the most likely effect of an increase in precipitation?
Lakes dry up. Shortage of water. Decrease in humidity.
Lead will float in water.
Actually, no. While their mass may be the same (1kg), the volume of lead is a lot smaller than that of feathers. As there is the same mass stuffed in a smaller space, it must be denser. The density of water is 1 g/cm3, so if the density of the lead is more than 1g/cm3, it has to sink
5) How could you get clean sand from a mixture of sand and little bits of
iron wire?
HOW LONG WILL IT TAKE TO PRODUCE 2DM3 OF CHLORINE GAS BY PASSING A 6A
CURRENT THROUGH CONCENTRATED SODIUM CHLORIDE SOLUTION AT R.T.P?
Answer:
2679.5 seconds or 2679.5 / 60 = 44.66 minutes to produce 2 dm3 of chlorine gas.
Explanation:
To solve this we must be knowing each and every concept related to current. Therefore, it will take 44.66 minutes to produce 2 dm³ of chlorine gas by passing 6A current through concentrated sodium chloride solution.
What is current?When an electrical current continually runs in a single direction, it is said to be in direct current. Rectifiers, batteries, generators using commutators, and fuel cells all generate direct current. A flashlight or an appliance powered by batteries, for instance, both use direct current.
Among the most crucial subjects addressed in physics is AC, DC current. A form of electrical current known as an alternating current, sometimes known as an AC current, is one in which the direction of electron flow changes periodically.
2679.5 / 60 = 44.66 minutes to produce 2 dm3 of chlorine gas by passing a 6A current through concentrated sodium chloride solution.
Therefore, it will take 44.66 minutes to produce 2 dm³ of chlorine gas by passing 6A current through concentrated sodium chloride solution.
To know more about current, here:
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N2 + 3 H2 → 2 NH3
After performing an experiment, you find that when 52.5g
H2 reacts with excess N2, 290g NH3 is formed. What is the
percent yield of this reaction?
a. 90.3%
b. 98.2%
c. 89.1%
d. 102.4%
Answer:
B
Explanation:
How does evaporation lead to precipitation
Answer:
1.evaperation
2.condenstation
3.precipatation
Explanation:
So I guess condenstation leads to precipatation-
Answer:
Evaporation is when water/liquids changes state from a liquid to a gas. Which eventually with enough water water vapor (which is what forms when water evaporates), it turns into clouds. But when the clouds get too heavy and full of water. Rain/precipitation falls from those clouds.
-Hope this helps!
Explanation:
How does a chemical bond form in
sodium chloride?
Sodium atoms an electron to form a
sodium ion with a charge of
Chlorine atoms __ an electron to form a
chloride ion with a charge of ____
There is an attraction between...
Answer:
please write the question correctly or upload the image of the problem
what is the physical property to the temperature when a liquid begins to boil?
Answer:
The boiling point
Explanation:
The boiling point is the temperature where a liquid starts to boil.
Answer:
the boiling point.
Explanation: