Which describes an covalent bond?

Answer:

cells comes from preexisting cells through the process of cell division

Answer:

A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does. In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products.

Answer:

C3H6O3

Explanation:

Hydroxyacetone

Answer:Static electricity can be created by rubbing one object against another object.

Explanation: This is because the rubbing releases negative charges, called electrons, which can build up on one object to produce a static charge

Answer:

1. Molecular weight = 333.3 g/mol

2. Strenght = 2222.2 mg/L

Explanation:

First, we need to find molarity (M) from normality (N) as follows:

[tex] N = nM [/tex]      

Where n is the number of OH⁻ = 2

[tex] M = \frac{N}{2} = \frac{0.03}{2} = 0.015 mol/L [/tex]

Now, when the H₃X solution is neutralized with Ca(OH)₂ we have:

[tex]\eta_{H_{3}X} = \eta_{Ca(OH)_{2}} = M_{Ca(OH)_{2}}*V_{Ca(OH)_{2}} = 0.015*0.04 = 6 \cdot 10^{-4} moles[/tex]              

Hence, the molecular weight (MW) of H₃X is:    

[tex] MW = \frac{m_{H_{3}X}}{\eta_{H_{3}X}} = \frac{0.2 g}{6 \cdot 10^{-4} moles} = 333.3 g/mol [/tex]

Finally, we can calculate the strength (S) of this solution in ppm as follows:

[tex] S = \frac{m}{V} = \frac{200 mg}{0.050 L + 0.040 L} = 2222.2 mg/L [/tex]

I hope it helps you!

Answer:

B. polar covalent

Explanation:

Answer:

Option A.

Explanation:

Probability is expressed in percent, fraction or in whole numbers

The only one that does not express a probability is 25.

A one in four chance, a fifty percent chance, a three in four chance. These all could be probabilities.

25 doesn't express a probability.

If this is incorrect, please, don't refrain to tell me.

Answer:

Newer

Explanation:

older fossils and rocks are found in lower strata than younger fossils and rock layers because the top layer fossils have not been there as long as the bottom layer fossils to be found deeper in the ground

Answer:

All three populations would increase.

Explanation:

Answer:

You know, i always say no but when i watch one i get addicted so... yeah. thanks for the positive messages

Explanation:

Thank you so much for spreading a postive message.

I dont know who needs to here this and I don't know you but I know life is hard. I know that no one gets it. I know you may feel depressed or stressed or not know who you are. I know that school is really hard right now. I know that you may have suicidal thoughts. I know because I've been there and still am but im getting better everyday. Progress is Perfect. I am always here to talk about it or anything you need.

Answer:

A

Explanation:

A sorry if not correct

Answer:

yes

Explanation:

CO2 is soluble because water molecules are attracted to these polar areas. The bond between carbon

Answer: im pretty sure it is b but a is also good  i going to be honest it a multi chose and i ant good at those

Explanation:

Answer:

moving things

Explanation:

kinetic energy is the energy of moving things

Answer: The answer is 18.01528.

Explanation:

Answer:

Dunkin' Donuts

Purple

Charli began dancing at age 3, and was a trained competitive dancer for over 10 years prior to starting TikTok.

Explanation:

Answer:

pink

Explanation:

Answer:

Its name is Sodium Bromide .

Answer:

=>. the chemical Name of NaBr

=>. sodium bromide

hope it helps

Answer:

CaCO₃ ------> CaO + CO₂

Note: The breakdown products of solid calcium carbonate is not carbon dioxide gas, oxygen gas, and solid calcium. Rather, it is calcium oxide and carbon dioxide as shown in the reaction equation above.

Explanation:

Calcium carbonate is a mineral which occurs in nature in rocks as calcite and limestone. It is also the main component of eggshells, snail shells, seashells and pearls. It has the molecular formula CaCO₃.

Calcium carbonate or limestone decomposes into calcium oxide and carbon dioxide when heated and the reaction is used to make quicklime and carbon dioxide gas. The equation of the reaction is given below:

CaCO₃ ------> CaO + CO₂

Calcium oxide, one of the products of The decomposition reaction is known as lime and is an important mineral used for many purposes such as reducing the acidity of soils, in the production of limelight, as well as serving as the main ingredient in cement.

The main use of calcium carbonate is in the construction industry as an ingredient of cement. Calcium carbonate is also an important mineral required by sea organisms for making their shells.

Answer:

c) Membrane lipids are amphipathic.

Explanation:

A cell can be defined as the structural, fundamental, biological and functional unit of life. Cells are found in all living organisms because they are the basic unit of life.

In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles. Some examples of cell organelles found in all living organisms such as trees, birds, and bacteria include; nucleus, mitochondria, lysosomes, ribosomes, chromosomes, endoplasmic reticulum, cytoskeleton, vesicles, golgi apparatus, and cell membrane.

Cell membrane is the wall of a cell and typically controls what leaves and enters the cell.

A general property of cell membranes is that membrane lipids are amphipathic. All the lipid molecules found in the cell membrane are amphipathic or amphiphilic, which means that they are "water loving" (hydrophilic) with a polar end or "water fearing" (hydrophobic) with non-polar end. Thus, membrane lipids have an end that's soluble in water (polar) while the other end is soluble in fat (non-polar).

The membrane lipids are amphipathic.  

• In the majority of cell membranes in animals, lipids, that is, fatty molecules forms about 50 percent of the mass of the cell.  

• All the molecules of lipid in a cell membrane are amphipathic, that is, they possess a polar end or hydrophilic and non-polar end or hydrophobic end.  

• The phospholipids are the most abundant lipids found in the cell membrane.  

• They have a polar head group and two hydrophobic hydrocarbon tails.  

• It is the amphipathic nature and shape of the molecules of lipids, which makes them to produce bilayers spontaneously.  

Thus, correct answer is option c, that is, membrane lipids are amphipathic.

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Answer:

C. is both an oxidizing and a reducing agent.

Explanation:

Answer:

A

Explanation:

Answer:

B. 88%

Explanation:

percent yield is the actual yield divided by the theoretical (predicted) yield, then multiplied by 100 to get a percentage.

110/125 = 0.88

0.88 x 100 = 88%

In chemistry, the term yield also known as the reaction yield represents the measure of the quantity of the moles of a product formed in the reaction to the reactant used. The correct option is B.

The amount of the product actually made compared with the maximum calculated yield is defined as the percent yield. It can also be known as the ratio of the actual yield to the theoretical yield.

The ideal quantity of the product is called the theoretical yield and it is obtained by working a stoichiometry problem. The actual amount of the product formed gives us the actual yield.

The equation of the percent yield is given as:

%yield = Actual yield / Theoretical yield × 100

110 / 125 × 100 = 0.88 × 100 = 88%

Therefore the percent yield of the reaction is 88%.

Thus the correct option is B.

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Answer:

The relative mass of an electron would be -1.

Answer: Bacteria, some insects, and fungal species are the decomposers of the dead and decaying matter.

Explanation:

The decomposers are the organisms which act and feed on the dead and decaying organic matter so as to obtain energy from it and degrade it to the simple forms that can be utilized by the plants. Bacteria, some insects and fungi that live in the soil and on the decaying matter. The fungi for example decay on the lignin present in the wood so helps in wood decomposition of trees. If the decomposer like fungi are absent the wood mass will not decompose and it will remain as waste and can be used by the plants in the form of nutrients.

Answer: energy is never moves

Explanation:

Answer:

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