Answer:
Oxygen is oxidized and hydrogen is reduced.
Explanation:
Let's consider the redox reaction during the electrolysis of water in an electrolytic cell.
2 H₂O ⇒ 2 H₂ + O₂
The corresponding half-reactions are:
2 e⁻ + 2 H₂O ⇒ H₂ + 2 OH⁻
2 H₂O ⇒ O₂ + 4 H⁺ + 4 e⁻
Oxygen is oxidized since its oxidation number increases from -2 to 0.
Hydrogen is reduced since its oxidation number decreases from +1 to 0.
What do scientists think life developed from?
simple chemicals
b.
oxygen
a.
c.
photosynthesis
a nucleus
d.
Please select the best answer from the choices provided
A
Answer:
A
Explanation:
Simple chemicals existing at the time synthesized into the earliest life forms into the sea
Answer:
The answer is A!
Explanation:
edg 2022
Metallic bonds form between what kinds of atoms?
Answer: A metallic bond is a type of chemical bond formed between positively charged atoms in which the free electrons are shared among a lattice of cations. In contrast, covalent and ionic bonds form between two discrete atoms. Metallic bonding is the main type of chemical bond that forms between metal atoms.
Explanation:
NOT MY WORDS! I HOPE THIS HELP!!!!!
Answer: Positive charged atom
Explanation: A metallic bond is a type of chemical bond formed between positively charged atoms in which the free electrons are shared among a lattice of cations.
How much mass does 1 mol of Oz gas have?
Answer:
31.998, i'm pretty sure.
Explanation:
Draw the diagram of 4-propylnonane
im missing something though
The "3" in CO32- means that
Answer:
The structure of the CO32– ion can be described in the Lewis formulation by these structures below. This means that a) two carbon-to-oxygen bonds are single bonds; the third is a double bond.
explain what variable is?
PLEASE FAST
Answer:
an element, feature, or factor that is liable to vary or change.
HELP PLEASE!!!!
Can someone answer it as a paragraph please I should submit it today
Answer:
Jodi is violating two rules; She is not wearing any safety equipment and managed to catch fire to herself. She is also not wearing gloves or safety goggles like the other two. Kimberly is leaving fire unattended, and can cause many accidents and if chemicals come in contact in the wrong way, it could be catastrophic. Kimberly is also carelessly using a fire extinguisher carelessly and chemicals in the can cause accidents.
Explanation:
I hope this helps <3
what is the molarity of 0.40 mol of NaCI dissolved in 1.6 L of solution
Answer:.25 M
Explanation: .4mol/1.6L = .25 M
Answer:
8383idndjdjdje7i3jrbdu vying to get out the 3game in the
Explanation:
dhdjdj
(2pts) During the Purification of Lactate Dehydrogenase (LDH) experiment, you will need 50ml of buffer A150. Buffer A150 is 30mM Tris (pH 8.8) and 150mM NaCl. Given 1L of 1.5M Tris and 500ml of 5M NaCl, how much of each stock do you need to make 250ml of the A150 buffer
Answer:
The answer is "[tex]20 \ mL[/tex]"
Explanation:
Given:
Molarity= number of moles
because it is 1 Liter
[tex]\to \frac{0.03\ moles}{1.5 moles}=0.02\ L= 20 \ mL \ of\ Tris\\\\[/tex]
therefore,
it takes 20 mL of Tris.
[tex]\to \frac{0.150 \ moles}{5\ moles} =0.03\ L\\\\[/tex]
[tex]= 30 \ mL \ of\ Nacl[/tex]
So, take [tex]20 \ mL\ of\ NaCl.[/tex]
Determine the amount in grams of kcl that exists in 20.3 g of a solution that contains 1.14 % KCI by mass.
Answer:
0.23 g
Explanation:
From the question given above, the following data were obtained:
Mass of solution = 20.3 g
Percentage by mass of KCl = 1.14%
Mass of KCl =?
The mass of KCl in the solution can be obtained as follow:
Percentage by mass = mass of solute / mass of solution × 100
1.14% = mass of KCl / 20.3
Cross multiply
Mass of KCl = 1.14% × 20.3
Mass of KCl = 1.14/100 × 20.3
Mass of KCl = 0.0114 × 20.3
Mass of KCl = 0.23 g
Therefore, the mass of KCl in the solution is 0.23 g
Convection currents occur:
a. Only in liquids
b. When a dense substance is warmer than a less dense substance
c. In both liquids and gases
d. Weakly in solids
Answer:
Jaheem has a goal running a total of 125 miles this month. Each day that he ran, he ran 7 miles. Which expression could Jaheem use to determine how many miles he has left to run after running for d days?
x a.
125 – 7d
x b.
7d + 125
x c. fraction numerator 125 over denominator 7 d end fraction
x d.
7dExplanation:Jaheem has a goal running a total of 125 miles this month. Each day that he ran, he ran 7 miles. Which expression could Jaheem use to determine how many miles he has left to run after running for d days?
x a.
125 – 7d
x b.
7d + 125
x c. fraction numerator 125 over denominator 7 d end fraction
x d.
7d
Who has the most sensitive taste buds?
the elderly
adults
babies
teenagers
Answer:
babies have the most sensitive taste buds
An atom has nine protons and ten electrons. This makes it:
An alpha particle
Neutrally charged
An ion
A cathode ray
Nonstoichiometric
Answer:
C: Ion
Explanation:
We are told that the atom has;
9 protons
10 electrons.
Now, in chemistry, when number of electrons(negative) is more than number of protons(positive), we say that the atom is negatively charged.
Now, looking at the options;
- alpha particles have 2 protons and 2 neutrons and so it is not correct
- for an atom to be neutrally charged, number of protons must be equal to number of electrons. Thus it is not correct.
- For an atom to be an ion, it means that there is an unequal amount of electrons and protons. If the atom has more electrons than protons, it is called anion(negative ion) but if it has less electrons than protons, it is called cation(positive ion).
Thus, option C is the correct answer.
This portion of the stratosphere if known as the _______.
A.
mesosphere
B.
tropopause
C.
thermosphere
D.
ozone layer
Physical weathering can result from the action of all of the following EXCEPT __________.
ice
burrowing by animals
carbon dioxide
plant roots
Suppose that you add 21.0 g of an unknown molecular compound to 0.250 kg of benzene, which has a K f of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 2.58 oC compared to pure benzene. What is the molar mass (in g/mol) of the unknown compound
What mass of magnesium nitrate contains 500g of nitrate?
Answer:
98
Explanation:
I dont even know
Explain as to why two hydrogen form H2 molecule but not molecules such as H3, H4 etc..
Hydrogen is a diatomic gas with two atoms (di meaning two). H2 is referred to as molecular hydrogen because hydrogen atoms are covalently joined together to form a molecule.
Because two hydrogen molecules are connected to one other by a covalent connection, hydrogen is denoted as H2.
Hydrogen has only one electron, so to complete its duet(octet in case of nitrogen) it has to bond with another hydrogen molecule to be stable and also exist.
You can remember it like this :
H = element
H2 = gas
Other diatomic gases :
O2 (oxygen)
N2 (nitrogen)
Another word for oxidation is
Decaying
Rusting
Cutting
Burning
What does Gibbs free energy predict?
A. It predicts what the rate of the reaction will be.
B. It predicts how high the activation energy is.
C. It predicts if entropy will increase or decrease.
D. It predicts whether or not a reaction will be spontaneous.
Answer:
D. It predicts whether or not a reaction will be spontaneous.
Explanation:
What does Gibbs free energy (ΔG) predict? .
A. It predicts what the rate of the reaction will be. NO. ΔG is a thermodynamical parameter and it is not related to the kinetics of the reaction.
B. It predicts how high the activation energy is. NO. ΔG is a thermodynamical parameter and it is not related to the kinetics of the reaction.
C. It predicts if entropy will increase or decrease. NO. ΔG depends on the entropy but not the other way around.
D. It predicts whether or not a reaction will be spontaneous. YES. If ΔG < 0 the reaction is spontaneous and if ΔG > 0 the reaction is not spontaneous.
How many grams of aluminum is required to react with 75.0 ml of 2.50 M HCl?
Answer:
63 g Al is required to react with 35 mL of 2.50 M hydrochloric acid
I'm sorry if it's wrong, I tried.
Explanation:
A diagram representing the levels of organization within an organism is shown below.
Х
-5-
Which level of organization is dentified by X?
(1) cell
(2) tissue
(3) organ
(4) organ system
A diagram representing the levels of organization within an organism is X. The level of organization is identified by X is tissue. Therefore, option 2 is correct.
What is tissue ?The term "tissue" refers to a collection of cells or fluid that cooperate to carry out a particular function in the body. Examples of such cells include those found in the kidney, heart, or blood cells, which transport oxygen to and waste products away from the body's cells.
The Old French term tissue, which means "a ribbon, belt, or piece of woven stuff," is where the noun tissue originates. Tissue really means to "weave fabric strands" as a verb. Tissues are now thought of as the disposable paper used for packaging presents or blowing our noses.
They stand for a degree of cell differentiation and order in living things. The activities of tissues include respiration, digesting, and transportation. As a result, tissues are crucial for multicellular creatures.
Thus, option 2 is correct.
To learn more about tissue, follow the link;
https://brainly.com/question/17664886
#SPJ2
the coal sample being used in this experiment is assumed to have 3% sulfur in its composition. what percent of sulfate is present in the coal samples
Answer: The percent of sulfate is present in the coal samples is 0.999%.
Explanation:
Given: Percentage of sulfur present = 3%
In [tex]SO^{2-}_{4}[/tex], the percentage by weight of Sulfur is calculated as follows.
[tex]Percentage = \frac{32 g}{32 + 64} \times 100\\= 33.33 percent[/tex]
This means that the amount of only sulfur present in [tex]SO^{2-}_{4}[/tex] in the sample is as follows.
[tex]\frac{3}{100} \times 33.33\\= 0.999 percent[/tex]
Thus, we can conclude that percent of sulfate is present in the coal samples is 0.999%.
Explain the leaf properties of water
Answer:
Water's polarity and its ability to form hydrogen bonds give it special properties, including adhesion, cohesion, and the ability to moderate temperature.
what type of chemical reaction is 2C₄H₁₀ + 13O₂ ---> 8CO₂ + 10H₂O?
Answer:
The answer is a combustion reaction.
Explanation:
This chemical equation is a combustion reaction because [tex]C_{4} H_{10}[/tex] is combining with oxygen, thus releasing a large amount of energy in the form of heat and light.
It is also a combustion reaction because the products of carbon dioxide and water are formed.
which sphere would this be found in?
Answer:
The answer you picked was right.
Explanation:
9 How many grams of O₂ are needed to produce 15.5 g Fe₂O3 in the following reaction? Fe(s) + O₂(g) → Fe₂O3 (s)
Answer:
Explanation:
so u can work out the amount of moles in FeO3 by doing mr of fe3o3 is 55.8*3+16*3=215.4
moles= mass/mr so you do 15.5g/215.4=0.0719 moles
then using 1 to 1 ratio so O2 moles is 0.0719
then use the equation mass=mole*mr
so 0.0719*16=1.15g
hope this make sense :)
The graph shows a relationship between volume and temperature. Which of the following statements is true?
A.) The graph shows a directly proportional relationship between volume and temperature and represents Charles' Law.
B.) The graph shows an indirectly proportional relationship between volume and temperature and represents Boyle's Law.
C.) The graph shows an indirectly proportional relationship between volume and temperature and represents Gay-Lussac's Law.
4.) The graph indicates that when temperature is increased, volume decreases.
Answer:
The graph shows a directly proportional relationship between volume and temperature and represents Charles' Law.
Explanation:
The relation between volume and temperature is given by :
Ideal gas law, PV = nRT
Where
P is pressure
V is volume
R is gas constant
T is temperature
As volume and temperature have direct relationship. Charles law states that there is a direct relationship between volume and temperature. The correct option is (a).
Which of a following elements has the Smallest atomic radius 1. Ge 2. SI 3. Carbon 4. Sn
Answer:
carbon
Explanation:
Atomic radius represents the distance from the nucleus to the outer shell of an element.
The element having the Smallest atomic radius is Carbon. Hence. Option (3) is correct
What is Atomic Radius ?The atomic radius of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron.
Atomic Radius Increases down the group.
All the given elements belongs to same group ie, 14th Carbon is the top most element of the group.
Therefore, The element having the Smallest atomic radius is Carbon. Hence. Option (3) is correct
Learn more about Atomic radius here ;
https://brainly.com/question/13607061
#SPJ2
The energies of the bonds broken in a certain reaction are greater than the energies of the bonds formed. Which one of the following statements about this reaction must be true?
a. The reaction is endothermic.
b. The reaction is exothermic.
c. The reaction is spontaneous.
d. The reaction is non-spontaneous.
Answer:
a. The reaction is endothermic.
Explanation:
The heat involved in a chemical reaction is given by the enthalpy change (ΔH), which is equal to the balance between the chemical bonds that are broken (release energy) and the chemical bonds that are formed (need energy):
ΔH ≅ bonds broken - bonds formed
If broken bonds > bonds formed ⇒ ΔH > 0 ⇒ endothermic reaction
Therefore, the reaction is endothermic (it requires energy).
