Choose the correct statements from the list below:
Answers
When something is oxidized, it loses electrons.
When something is reduced, it gains electrons.
So the correct statements would be the second to last and third to last statements
The correct statements are -
- An element has been oxidized when it has reacted with oxygen gas to produce a compound with the oxygen atom included in its formula,
- A compound has been reduced when it originally had an oxygen atom in its formula and lost it as a consequence of reacting with some other element or compound,
- An element has been oxidized when, as a consequence of a chemical reaction, it has lost electrons to produce the same element as a product with a more positive oxidation state and
- An element has been reduced when, as a consequence of chemical reaction, it has gained electrons to produce the same element as a product with a more negative oxidation state.
Oxidation state, also known as oxidation number, is a measure of the degree of oxidation or reduction of an atom within a compound or ion. It indicates the number of electrons that an atom has gained or lost, or the hypothetical charge that it would have if all the shared electrons in a compound were assigned to the more electronegative atom.
The oxidation state of an atom can be positive, negative, or zero. In a neutral molecule, the sum of the oxidation states of all the atoms must be zero. In ions or compounds, the sum of the oxidation states of all the atoms must be equal to the overall charge of the species.
Oxidation states are assigned based on a set of rules that consider the electronegativity of atoms, the number of valence electrons, and the distribution of electrons in a molecule or ion. The oxidation state provides information about the reactivity, bonding, and redox reactions of substances. It is often represented by Roman numerals or as a signed integer.
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Related Questions
Which of the following can be used to neutralize an ammonia (NH3) solution?
Determine the mass of hydrogen chloride needed to react completely with 12.8 g of aluminum to produce aluminum chloride and hydrogen gas.
The nucleus of an atom of K-42 contains(1) 19 protons and 23 neutrons(2) 19 protons and 42 neutrons(3) 20 protons and 19 neutrons(4) 23 protons and 19 neutrons
What are particles of carbon otherwise known as, and what kind of pollution do they cause???
Answers
Answer:
7 : I think it is because heat rises, and to make the hot air balloon ride is the fire torch inside it.
Explanation:
I donno 9
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Marine debris are among the biggest threats in the oceans nowadays. These include materials that are intentionally or unintentionally left in the ocean or any marine environment. Marine debris may include cigarette butts, food wrappers, bottle caps, straws, grocery bags and others.
It is best to say that marine debris is harmful to the environment. Marine debris' detrimental impacts on marine ecosystems, wildlife, and even human health have made it a major global concern.
Any human-made garbage that finds its way into oceans, seas, or other bodies of water is referred to as marine debris, also known as marine litter. It includes a variety of substances, such as rubber, paper, glass, metal, and plastic. The purpose of this note is to clarify the origins, effects, and potential remedies of this urgent problem.
Damage to Marine Life: Marine species are seriously at risk from marine garbage. Injuries, asphyxia, and even death can result when animals like sea turtles, seagulls, whales, and dolphins get tangled in garbage or mistake it for food. Damage to Ecosystems: Sensitive habitats including coral reefs, seagrass beds, and mangroves can suffer damage from marine trash. It interferes with their natural processes, has an impact on biodiversity, and changes nutrient cycles.
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Final answer:
The color of light affects plants' growth and leaf production due to the role of different light colors in photosynthesis and the phytochrome system in plants. Chlorophyll mainly absorbs red and blue light from the light spectrum for photosynthesis, and far-red light can slow plant growth. Therefore, exposure to different light colors could result in different numbers of leaves.
Explanation:
The subject of the question is how the color of light affects the growth of plants, specifically the number of leaves plants produce. This experiment is primarily about the effect of light on plant's photosynthesis, a process that uses light to convert carbon dioxide and water into glucose. The glucose is utilized to fulfill various energy requirements of the plant's growth, including the growth of leaves.
Light has diverse wavelengths, with each color representing a different wavelength. While white light contains all the possible color wavelengths, the red light specifically contains a higher wavelength region. According to Sir Isaac Newton's experiment, sunlight, which looks white to us, contains all the colors of the spectrum.
In this context, the phytochrome system in plants plays a crucial role. Chlorophyll, the green pigment in leaves, absorbs mainly red and blue light from the light spectrum and uses that energy for photosynthesis. However, far-red light, which is one element of white light, is not absorbed. If a plant is exposed more to far-red light, it could slow its growth.
Consequently, the difference in the number of leaves that Mr.Smith observed in the plants under white light and those under red light might be due to the role of light color in photosynthesis and the phytochrome system in plants.
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Answers
Answer:
NO: A and B
YES: C and D
Explanation:
A. Atomic Number No. This is the number of protons in the nucleus.
B. Molecular Weight No. Protons + Neutrons
C. Chemical Reactivity Yes. The electron configuration allows prediction of reactivity with other elements.
D. Valence Electrons Yes. The most active electrons is bonding.
Answers
a. 0.712 M
b. 0.210 M
c. 0.336 M
Molarity is a measure of the concentration of solute in a solution.
It can be expressed as moles of solute ÷ volume of solution:
c = n ÷V
where:
c - concentration of solute,
n - moles of solute
V - volume of solution
n can be expressed as:
n = m ÷ Mr
where:
n - moles of solute
m - mass of solute
Mr - relative molecular mass
a. We know volume:
V = 289.2 mL = 0.2892 L
We need n and c.
n = m ÷ Mr
m = 15.4 g
Mr (KCl) = 74.55 g/mol
n = 15.4 g ÷ 74.55 g/mol
n = 0.206 mol
Thus,
c = 0.206 mol ÷ 0.2892 L
c = 0.712 mol/L = 0.712 M
b. We know volume:
V = 0.614 L
We need n and c.
n = m ÷ Mr
m = 14.4 g
Mr (CaCl₂) = 110.98 g/mol
n = 14.4 g ÷ 110.98 g/mol
n = 0.129 mol
Thus,
c = 0.129 mol ÷ 0.614 L
c = 0.210 mol/L = 0.210 M
c. We can use formula:
m₁V₁ = m₂V₂
m₁ = 3 M
V₁ = 28 mL= 0.028 L
m₂ = ?
V₂ = 0.250 L
Thus:
3 M × 0.028 L = m₂× 0.250 L
m₂ = 0.336 M