why wasn't wegner's theory of continental drift accepted during his lifetime?

Answer:

gas vibrate and move freely at high speeds. liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.

Answer:

The soilds vibrate in a fixed position and are very packed together whilst in liquids they are close together but they can move around and gases are widely spaced and move around randomly

Explanation:

Answer:

Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.

Explanation:

please mark me brainliest and it was hard making an answer

Answer: Density is an intensive property because it does not depend on the amount.

The statements correctly describe density as an intensive property because it does not depend on the amount. The correct option is a.

The mass per unit volume is known as density. A scalar quantity, density. It is represented by the letter D, and the Greek letter rho is used as the sign for density. Mass divided by volume is how density is computed.

Mass is a physical body's total amount of matter. Mass is defined as the sum of the moles of the material and the compound's molar mass. A material's density is described as its mass per unit volume.

The definition of intensive qualities of matter is those that are independent of the amount of material present in a body. This implies that they won't change regardless of how much matter is there in a body.

Therefore, the correct option is a. Density is an intensive property because it does not depend on the amount.

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The question is incomplete. Your most probably complete question is given below:

a. Density is an intensive property because it does not depend on the amount.

b Density is an intensive property because it depends on the amount of a substance.

C Density is an extensive property because it depends on the amount of a substance.

d Density is an extensive property because it does not depend on the amount.​

The answer is 975S because u add all ofthem

Answer:

1. Iodine is reduced

2. Iodine is reduced

3. Iodine is oxidized

Explanation:

1. Oxidation number goes from 0 to -16

(oxidation number decreases = reduction)

2. Oxidation  number goes from 0 to -6

(oxidation number decreases = reduction)

3. Oxidation number goes from +2 to 0.

(oxidation number increases; the atom loses electrons = oxidation)

Answer:

they have some similarities

Explanation:

they are grouped together because they have similarities, but they do not all have the same characteristics because a domain is too broad for that

Explanation:

The ionization energy of an element decrease with growing atomic length. as the force of attraction between the nucleus and electron decreases with increasing size.

It will become clean to take away the outermost electron from an atom. for that reason, much less strength is needed to cast off an electron from its valence shell.

Ionization energy, ionization strength is the minimum strength required to take away the maximum loosely bound electron of an isolated gaseous atom, fantastic ion, or molecule.

The ionization energy of atoms denoted Ei, is measured with the aid of locating the minimum power of light quanta (photons) or electrons expanded to recognized electricity so one can kick out the least certain atomic electrons. The dimension is finished in the gas segment on single atoms.

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Answer:

sorry we don't know the answer.

Answer: a)Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

b) Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

c) Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Explanation:

(a) Balanced formula equation:

(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS

Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

(b) Balanced formula equation:

Na₂SO₃ + CaCl₂ → NaCl + CaSO₃

Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

(c) Balanced formula equation:

CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄

Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Approximately 163 mL of 18.0 M sulfuric acid must be used to prepare 15.5 L of 0.195 M H2SO4.

To determine the volume of 18.0 M sulfuric acid needed to prepare 15.5 L of 0.195 M H2SO4, we can use the formula:

C1V1 = C2V2

Where:

C1 = Initial concentration of sulfuric acid

V1 = Initial volume of sulfuric acid

C2 = Final concentration of H2SO4

V2 = Final volume of H2SO4

In this case, we are given:

C1 = 18.0 M

V2 = 15.5 L

C2 = 0.195 M

We need to find V1, the initial volume of sulfuric acid.

Rearranging the formula, we have:

V1 = (C2 * V2) / C1

Substituting the values we have:

V1 = (0.195 M * 15.5 L) / 18.0 M

V1 = (3.0225 mol/L * 15.5 L) / 18.0

V1 = 2.93525 mol / 18.0

Calculating V1:

V1 ≈ 0.163 L or 163 mL

Therefore, approximately 163 mL of 18.0 M sulfuric acid must be used to prepare 15.5 L of 0.195 M H2SO4.

It's important to note that when performing calculations involving concentrated acids like sulfuric acid, proper safety precautions and handling protocols should be followed due to the corrosive nature of the acid.

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Answer:

Molarity of HCl = 1.6M

Explanation:

The chemical reaction equation is;

HCl(aq) + NaOH(aq) —> NaCl(aq) + H2O(l)

Now, molarity = number of moles/volume

Thus, for NaOH, we have;

Number of moles = molarity × volume = 2M × (20/1000) L

Number of moles = 0.04 moles

Using the coefficients in the chemical equation above, we can find the corresponding number of moles for HCl.

Number of moles of HCl = 0.04 moles NaOH × (1 mole of HCl/1 mole of HCl) = 0.04 moles of HCl

Thus;

Molarity of HCl = 0.04/(25/1000)

Molarity of HCl = 1.6M

Explanation:

I'm pretty sure it's; because of the invention of the microscope, scientists were able to work together to develop the cell theory.

Answer:

detail is given below.

Explanation:

The charged particles of nucleus are protons while neutrons are neutral having no charge.

We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus.

Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.

Symbol of proton= P⁺  

Symbol of neutron= n⁰  

The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.

one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.

While the atomic number is 20.

The little circles or spheres in room-temperature water represent water molecules.

A molecule is the smallest unit of a substance that possesses all of that substance's physical and chemical characteristics

The smallest unit of a substance, a molecule is made up of two or more atoms joined together by chemical bonds while maintaining the substance's composition and qualities.

Examples of molecules are water molecules. In water molecules, the mobility of molecules is constant. The pulls that water molecules have on one another keep them in close proximity.

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Answer:

Plant breeding

Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. It has been used to improve the quality of nutrition in products for humans and animals.

Explanation:

Answer:

German chemist G.E. Stahl

1. Ammonia is a colorless gas with a chemical formula of NH3, when it comes in contact with water, it will be transformed into Ammonium ion and it will produce one hydroxide ion, and this is why Ammonia will present a more basic (pH) behavior, the reaction that represents this behavior is:

NH3 + H2O -> NH4+ + OH-

Number 4 is the only one that represents it well

Number 3 has the same reaction but since there is a plus sign instead of an arrow, I consider it wrong.

hope this answer helps and have a good day

Answer:

glucose molecules that our cells need from is plants

Answer:

b

Explanation: I asked my chemistry teacher lol

Carbon - 14 is carbon's isotope that contains eight neutrons and six protons. It is formed by the collision of the atmospheric nitrogen with the neutrons in space. Thus, option B is correct.

Carbon -14 has been known as the radioactive isotope of the carbon element with different atomic mass but has been constituted of the same atomic number.

The neutron in space collides with the nitrogen present in the atmosphere of the earth to undergo a transmutation reaction that can be shown as,

¹₀n + ¹⁴₇N → ¹⁴₆C + ₁¹H

Here, the atomic number or the number of the protons of carbon remains the same and is six, whereas the number of neutrons increases and becomes eight. This increases the atomic mass of the species.

Therefore, in option B. the neutrons collide with nitrogen to form carbon-14.

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What percentage of the Earth's surface is covered by oceans?

71 percentage

What percentage of the Earth's surface is covered by oceans?

71 percent/%

Answer:

Water molecules' adhesion aids plants in moisture absorption at their roots. Water's initial boiling point is attributed to cohesion, which helps animals regulate their body temperature.

Explanation:

If the temperature drops, an endothemic response is occurring.

endothermic

As a result, dissolving table salt in water is endothermic. The only chemical reaction that can be either exothermic or endothermic is the dissolving of salts in water.

Exothermic or endothermic dissolving of a salt depends on which of the two energies, lattice or hydration, is larger. The quantity of energy released per unit of salt is often expressed in terms of kilocalories per mole (kcal/mol) or kilojoules per mole (kJ/mol).

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Answer: An existing theory is modified so that it can explain both the old and new observations.

Explanation:

Answer:

The correct anwser would be B

Explanation:

Chlorobenzene can be converted into benzoic acid using Grignard reagent. Thus, treating with Mg metal in dry ether followed by carboxylation and then hydrolyising the product gives benzoic acid.

Grignard reagents are alkyl magnesium halides with the general formula RMgX. They can be prepared by treating alkyl halides with Mg metal in presence of dry ether.

Chlorobenzene when treated with Mg gives MgCl substituted benzene ring which upon carboxylation using carbon dioxide followed by hydrolysis gives benzoic acid.

Therefore, the reagents needed for the conversion of chlorobenzene to benzoic acid are Mg, CO₂ and water.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer: B: Your ears send a message through the nerves to the brain.

Answer:

B!!!!

Explanation:

hope this helps! :D

Size-exclusion chromatography (SEC) is a suitable chromatographic method for isolating pure a and b chains.

SEC is a technique that separates molecules based on their size. In this case, the a and b chains can be separated from other components based on their molecular weight. SEC columns have porous beads that allow smaller molecules to enter and travel through the beads, while larger molecules are excluded and elute first. By choosing an appropriate SEC column, the a and b chains, which typically have different molecular weights than other components, can be isolated and collected separately. This method ensures the purity of the isolated a and b chains.

Size-exclusion chromatography (SEC) is a useful chromatographic method for isolating pure a and b chains. The technique separates molecules based on their size, and by utilizing a suitable SEC column, the a and b chains can be separated from other components due to their distinct molecular weights. This approach guarantees the purity of the isolated a and b chains, making it an effective method for their isolation.

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