Answer:
c. H2(g) + CuO(s) → Cu(s) + H2O(l)
e. H2(g) + Cl2(g) → 2HCl(g)
Explanation:
A redox reaction is a reaction that involves a changes in oxidation number of the species involved in the reaction.
The oxidizing agent experiences a decrease in oxidation number while the reducing agent experiences an increase in oxidation number.
For H2(g) + CuO(s) → Cu(s) + H2O(l)
Copper is reduced from +2 to 0 while hydrogen is oxidized from 0 to +2 Hence hydrogen is the reducing agent while copper is the oxidizing agent.
For H2(g) + Cl2(g) → 2HCl(g)
Chlorine is reduced from 0 to -1 while hydrogen is oxidized from 0 to +1. Hence chlorine is the oxidizing agent while hydrogen is the reducing agent.
Estimate the salt-to-water mass ratio that would produce the necessary change in temperature (i.e., 22-25°C.) Use the mass of salt calculated in the previous question and the water-to-salt ratio to determine the volume of water needed.
Answer:
Sea water salinity is expressed as a ratio of salt (in grams) to liter of water. In sea water there is typically close to 35 grams of dissolved salts in each liter. It is written as 35‰. The normal range of ocean salinity ranges between 33-37 grams per liter (33‰ - 37‰).
(01.02 LC) Which of the following is a contact force? Select one:
a. Electrical force .
b. Frictional force
c. Gravitational force
d. Magnetic force
Answer:
Frictional Force is contact force.
Answer:
its friction force bcz in friction u become in contact with a surface that produces heat
Bubbles and fizzing can be seen instantly when baking soda is mixed with vinegar. The bubbles are evidence of which of the following?
A gas is formed when baking soda and vinegar are mixed.
Baking soda dissolves in vinegar when they are mixed.
Vinegar turns into alcohol when it is mixed with baking soda.
A precipitate is formed when baking soda and vinegar are mixed.
Which statement best explains the differences in diamond and graphite? *
1 point
Both substances are made of the same atoms, but the atoms in diamond are harder than the atoms in graphite.
Both substances are made of the same atoms, but the atoms in diamond are clear and the atoms in graphite are gray.
Both substances are made of the same atoms, but diamonds are bigger than graphite.
Both substances are made of the same atoms, but the atom arrangement forms different structures.
Answer:
Carbon alone forms the familiar substances graphite and diamond. Both graphite and diamond are made only of carbon atoms. Graphite is very soft and slippery. Diamond is the hardest substance known to man. If both are made only of carbon what gives them different properties?
The answer lies in the way the carbon atoms form bonds with each other.
Explanation:
Can anyone just give me the answers?
Answer:
i answered you
Explanation:
A gas is under a pressure of 760torr and occupies volume of 525cm3. If the pressure is doubled, what volume would gas now occupy? Assume the temperature is constant?
262. 5cm3.
using the Boyles law formula. p1v1=p2v2
P1=760torr.
v1=525cm³
p2=760×2=1520torr.
v2=?
p1v1=p2v2
760×525=1520×v2
v2=[ 760×525]÷1520
v2= 262.5cm³
when the pressure increases, the volume decreases.
Which acid was used in the titration curve below?
HCl
H2 S O4
HNO3
H3PO4
HNO3
Explanation:
hydrochloric acid (HCl), sulfuric acid (H 2start subscript, 2, end subscriptSO 4start subscript, 4, end subscript), nitric acid (HNO 3start
What has more kinetic energy? 120 180, 105
Answer:
If those values are in terms of mass, weight or velocity
Kinetic energy will be in the order 180 » 120 » 105
Answer:
105, if you're dealing with the weight of object
Explanation:
It's the amount of speed/movement an object can move. The lighter the weight the more amount of speed it has.
Hope this helps!
Which element is in the same group as Al (aluminum)?
O A. B (boron)
O B. Si (silicon)
O C. Zn (zinc)
O D. Mg (magnesium)
Fossils indicate that many organisms that lived long ago are
The reduced coenzymes generated by the citric acid cycle donate electrons in a series of reactions called the electron transport chain. The energy from the electron transport chain is used for oxidative phosphorylation. Which compounds donate electrons to the electron transport chain
Answer:
NADH and FADH2
Explanation:
The electron transport chain yields ATP, the energy driver for the body's metabolism by using atmospheric oxygen at the mitochondria.
The role of NADH and FADH2 (nicotinamide adenine dinucleotide (NAD) + hydrogen (H) and Flavin adenine dinucleotide) becomes so important as they are responsible for giving out electrons to the electron transport chain and that is a very crucial process for cellular respiration as adenosine triphosphate is produced. The hydrogen molecule in NADH and FADH2 are lost to the waiting oxygen molecule which now forms water.
3
Humans use energy from several different sources.
What evidence from the passage supports this statement?
dying
use
Iuch of
6. These
ecess, as
you.
A People use energy to play, study, eat, make basketballs,
and generate electricity
B People use energy from natural gas of coal the sun
wind and water
Wind turbines can affect bis bars and other wilde
derstand
An ionic bond is a bond that forms between
Olons with opposite charges.
O Atoms with neutral charges.
O One atom's nucleus and another atom's electrons
O The protons of different atoms
Answer: An ionic bond is a bond that forms between ions with opposite charges.
Explanation:
A chemical bond formed by the transfer of electrons from one atom to another is called an ionic bond.
For example, sodium has electronic distribution as 2, 8, 1 and chlorine has electronic distribution as 2, 8, 7.
In order to attain stability, sodium needs to lose 1 electron and chlorine needs to gain one electron. Therefore, sodium will transfer its one valence electron (forming [tex]Na^{+}[/tex] ion) to chlorine atom (forming [tex]Cl^{-}[/tex] ion) which leads to the formation of NaCl compound.
Thus, we can conclude that an ionic bond is a bond that forms between ions with opposite charges.
Select the statement that is FLASE about this experiment. Group of answer choices Changing metal solution will affect the redox potential. To ensure consistent data, collect the redox potential values at least three times. Changing temperature will affect the redox potential. To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds. Changing concentration will affect the redox potential.
Well arranged question is;
Select the statement that is FALSE about this experiment. Group of answer choices;
A) Changing metal solution will affect the redox potential.
B) To ensure consistent data, collect the redox potential values at least three times.
C) Changing temperature will affect the redox potential.
D) To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds.
E) Changing concentration will affect the redox potential.
Answer:
D) To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds.
Explanation:
Usually, redox potential is the measure of the ability of chemical elements to gain/lose electrons from/to an electrode respectively and after which they undergo reduction or oxidation respectively.
From online sources on experiments to determine redox potential, and taking into account the nernst equation which is; E_cell = E_0 – (RT/nF)•ln Q
Where;
E_cell is cell potential
E_0 is potential of the cell under standard conditions
R is universal gas constant
T is temperature
n is the number of electrons that are transferred in the redox reaction
F is Faraday's constant
Q is reaction quotient
Now, with all that in mind and looking at the options, the one that is false is option D.
3. A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressures of the three
gases in the tank are 35.0 atm of O2, 5.0 atm of N, and 25.0 atm of He, what is the total pressure
inside of the tank?
Answer:
35.0 atm + 5.0 atm + 25.0 atm = 65 atm
Explanation:
Partial pressure + Partial pressure + Partial pressure = Total pressure
The concept Dalton's law of partial pressures is used here to determine the total pressure of the gas. The total pressure of the gas is the sum of partial pressures of the gas. Here the total pressure is 65 atm.
What is Dalton's law of partial pressure?The pressure exerted by a mixture of two or more non-reacting gases enclosed in a definite volume is equal to the sum of the partial pressures of the component gases.
The partial pressure of a component gas in a mixture is the pressure that gas would exert if present alone in the vessel at the same temperature as that of the mixture.
Let p₁, p₂, p₃, etc. are the partial pressures. Then the total pressure is given as:
P = p₁ + p₂ + p₃
P = 35.0 + 5.0 + 25.0
P = 65 atm
Thus the total pressure is 65 atm.
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what is the molarity of a solution of sodium hydroxide if it 15.0 mL requires 25.0 ml of 0.25M HCl to reach the end point
Answer:
0.42 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
The mole ratio of acid, HCl (nₐ) = 1
The mole ratio of base, NaOH (n₆) = 1
Finally, we shall determine the molarity of the base, NaOH. This can be obtained as follow:
Volume of acid, HCl (Vₐ) = 25 mL
Molarity of acid, HCl (Mₐ) = 0.25 M
Volume of base, NaOH (V₆) = 15 mL
Molarity of base, NaOH (M₆) =?
MₐVₐ / M₆V₆ = nₐ/n₆
0.25 × 25 / M₆ × 15 = 1
6.25 / M₆ × 15 = 1
Cross multiply
6.25 = M₆ × 15
Divide both side by 15
M₆ = 6.25 / 15
M₆ = 0.42 M
Therefore, the molarity of the base, NaOH is 0.42 M
State the number of neutrons in an atom of Ne-20 and the number of neutrons in an atom of Ne-22. choose two answers * 1 point Ne 20: 10 Ne 20: 11 Ne 22: 12 Ne 22: 13
Answer:
Ne 20: 10
and
Ne 22: 12
Explanation:
Ne-20:
N = A - Z = 20 - 10 = 10 neutrons
Ne-22:
N = A - Z = 22 - 10 = 12 neutrons
N: number of neutrons
A: mass number
Z: atomic number
If the atomic number of chlorine is 17 and the atomic mass is 35.5 amu, then the molar mass of chlorine is?
Answer:
If the percentage abundance of Cl-35 is x , then x×35+(100−x)37100=35.5
75% of Cl-35 and 25% of Cl-37.I hope this helped!
Explanation:
Que es lo primero que debe hacer un grupo antes del análisis e interpretación de datos
How many moles of ammonia would be required to react exactly with 0.554 moles of copper(II) oxide in the following in chemical reaction? 2 NH3(g) + 3 CuO(s)= 3Cu(s) + N2(g) + 3 H2O(g)
In a simple model used to analyze UV photoelectron spectra, the orbital energies of the neutral molecule and the cation formed by ejection of an electron are assumed to be the same. In fact, some relaxation occurs to compensate for the reduction in the number of electrons by one. Would you expect the orbital energies to increase or decrease in the relaxati
Answer:
Increases.
Explanation:
The orbital energies increases when the reduction of electron number occurs due to removal from the outermost shell. When we go farther from the nucleus, the energy of orbitals increase. The electron that is farther from the nucleus experience more repulsions because of the shielding effect of other electrons that is present between nucleus and outermost electron. Due to this shielding effect, it is easier to remove the outermost electron which leads to increase orbital energies.
In the area with a large population of valuable ocean organisms is called a(n)
Answer:
fishery
An area with a large population of valuable ocean organisms is called a fishery. If it was correct mark me as brainiest
Match the object with its characteristic.
Earth
?
Electromagnet
Venus
?
Permanent magnet
Refrigerator
magnet
?
Not magnetic
Answer:
Earth is electromagnet
Refrigerator is permanent magnet
Venus is not
Explanation:
Why do scientist conduct experiments on animals?
Answer:
Animals are used in scientific research to help us understand our own bodies and how they work. This is necessary to develop new medicines. Animals are also used to safety test potential medicines before they are tested in people and to check the safety of other chemicals.
Explanation:
What characteristic should an isotope used for dating have?
O A. It should have a half-life much shorter than the age of the object
being dated.
B. It should have a half-life that is close to the age of the object being
dated.
O C. It should have a half-life that changes with time in the object being
dated.
O D. It should have a half-life much longer than the age of the object
being dated.
Answer:
B
Explanation:
took the test
D. It should have a half-life much longer than the age of the object being dated. When using isotopes for dating purposes, it is important to choose an isotope with a half-life that is significantly longer than the age of the object being dated.
What is the half-life time?The half-life is the time it takes for half of the radioactive isotopes in a sample to decay into stable isotopes. By measuring the ratio of the original radioactive isotope to the decay product, scientists can determine the age of the object.
The majority of the radioactive material would have decayed if the isotope had a half-life substantially less than the age of the artefact, making it challenging to precisely establish the age.
On the other hand, the dating procedure would become more challenging and unpredictable if the isotope in the object being dated (option C) has a half-life that varies over time.
As a result, an isotope with a long half-life offers a stronger basis for precise dating since it enables sufficient radioactive decay to take place, producing quantifiable and trustworthy data.
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In order to have an eclipse,the moon,sun and earth have to be?
A. Below each other
B. Above each other
C. In alignment
Explanation:
When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth. When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse. ... But lunar eclipses do not occur every month because the Moon's orbit is tilted five degrees from Earth's orbit around the Sun.
if the pH of a solution is 8.43, what is the [H+] concentration?
Answer: 3.7x10^-9
Explanation:
In butter, [H3O+] =6.0x10-7 M, what is the pH? Is butter acidic, basic, or neutral?
Answer:
Label each solution as acidic, basic, or neutral based only on the stated pH.
milk of magnesia, pH = 10.5
pure water, pH = 7
wine, pH = 3.0
Solution
With a pH greater than 7, milk of magnesia is basic. (Milk of magnesia is largely Mg(OH)2.)
Pure water, with a pH of 7, is neutral.
With a pH of less than 7, wine is acidic.
What is the molarity of a solution?
the answer is The number of moles of a solute per kilogram of solvent
Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
Question 5 of 25
Which type of reaction is shown by this general equation?
Reactants + energy - products
A. Synthesis
B. Combustion
C. Endothermic
D. Exothermic
Answer:
C Endothermic
Explanation:
a. p. e. x