Early humans planted seeds from corn plants with large kernels. true or false

Answer: A light bulb in the same room at the same temperature.

Explanation: Yw, BYE!!!

Answer:

Fossils are remains or traces from ancient life's that is most likely buried in rocks anywhere in the world. Fossils are basically bones, teeth, shells, nests, leaf impressions, and footprints. That is technically explaining what our planet was like long ago. Some dinosaur fossils have been found. Paleontologists find them almost everywhere. If you don't know what Paleontologists are, they're basically people who study fossils. A lot of fossils are found in sedimentary rocks. Sedimentary is a rock that has been formed from things like sand, mud, and many other kinds of rocks.

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Answer:

20 km/h

Explanation:

Speed = distance ÷ time

Speed = 10 ÷ 0.5 hours

Speed = 20 km/hr

When 1.5 mL of 6.0M hydrochloric acid is mixed with an aqueous solution of silver nitrate (AgNO3), the precipitate that will come out of the solution is silver chloride (AgCl)

After you mix about 1.5 mL of 6.0M hydrochloric acid (HCl) with aqueous layer, the precipitate that will come out of the solution is AgCl. In this reaction, silver ions present in the aqueous solution will combine with chloride ions present in hydrochloric acid to form silver chloride precipitate AgCl.

AgNO3 + HCl ⟶ AgCl↓ + HNO3

Here, AgCl is an insoluble solid, so it is seen as a precipitate (a solid that settles out of a liquid mixture) when HCl is added to the aqueous solution of AgNO3 (silver nitrate).

This reaction is an example of a precipitation reaction where a solid is formed from two soluble compounds. The formation of AgCl precipitate confirms the presence of chloride ions in the sample. This reaction is widely used in qualitative analysis to detect the presence of chloride ions in an unknown sample. Moreover, silver chloride is also used in the photographic industry, as it is sensitive to light and can be used to create photographic prints.

When 1.5 mL of 6.0M hydrochloric acid is mixed with an aqueous solution of silver nitrate (AgNO3), the precipitate that will come out of the solution is silver chloride (AgCl). This reaction is an example of a precipitation reaction where a solid is formed from two soluble compounds. Silver chloride is an insoluble solid that is widely used in qualitative analysis to detect the presence of chloride ions in an unknown sample.

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The Cs+ ion forms the least strong ionic bond with any given anion. Ions with opposing charges are attracted to one another electrostatically to form ionic bonds, sometimes referred to as electrovalent bonds, in chemical molecules.

two ionic bonds When certain electrons are completely transported from one atom to another, ionic connections are formed. A negatively charged ion known as a cation is created when an atom loses one or more electrons. An anion, or negatively charged ion, is created when an atom accepts one or more electrons.

Significant Lessons. Ionic materials have high melting points. Ionic substances are stiff and brittle. An ionic substance splits into ions when it is dissolved in water.

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Answer:

positively charged -protons

Negatively charged-electrons

Operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature can have negative consequences for the engine's performance and longevity.

Firstly, lubricants are specifically formulated to function optimally within a certain temperature range. When an engine is subjected to temperatures beyond the recommended range, the lubricant may not be able to provide adequate protection and lubrication. This can result in increased friction between moving parts, leading to excessive wear and tear, and potentially causing damage to the engine components.

Secondly, using a lubricant designed for lower temperatures in extreme heat can lead to a reduction in the lubricant's viscosity. Viscosity refers to the thickness or flow resistance of a fluid. In high temperatures, the lubricant may become thinner and lose its ability to form a stable protective film on the engine surfaces. As a result, the engine may experience increased metal-to-metal contact, leading to accelerated wear and potential engine failure.

Additionally, high temperatures can cause the lubricant to break down or degrade more quickly. This can result in the formation of harmful deposits and sludge, which can clog oil passages and restrict the flow of lubricant to critical engine components. Reduced lubrication can result in increased friction, heat buildup, and potential engine damage.

To summarize, operating an engine in extremely high temperatures using a lubricant recommended for a much lower temperature can lead to increased friction, accelerated wear and tear, potential engine failure, and the formation of harmful deposits. It is important to use the lubricant recommended by the manufacturer for the specific temperature range to ensure optimal engine performance and longevity.

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Answer:

51.79g Li₃P.

Explanation:

Li has a molar mass of 6.94 g (since there are 3, you multiply it 3 times) and P has a molar mass of 30.97 g. 6.94(3) + 30.97 = 51.79g.

Answer:

the water would rise above you and spill out

Explanation:

the water would form around you, because the human body is solid, and would take up some of the volume of the tub. the water then goes up due to the added volume.

Answer:

C : Television

Explanation:

We should click on button from where the wire gets connected to the tv and operate. TV needs electric conductor for the flow of current .

To remove any remaining unreacted inorganic component (from the added separating reagent) in the ether solution, two additional washes were performed after extracting benzoic acid into the aqueous solution as its anionic salt.

Benzoic acid must first be extracted from a mixture by adding NaOH, and then any excess NaOH must be removed in order to continue. Further, to get rid of the excess NaOH in the solution, it is washed with water twice or three times.

To reduce the amount of residue and other impurities in the layers, washing is done. The polar impurities, such as the leftover anionic salt of benzoic acid, tend to migrate to the water when washing, giving you a purer organic layer because ether is non-polar and water is polar.

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The wavelength of the indigo light can be calculated using the formula:

wavelength = speed of light / frequency

The speed of light is approximately 3.00 x 10^8 m/s.

So, substituting the given frequency into the formula:

wavelength = (3.00 x 10^8 m/s) / (7.08 x 10^14 Hz)

wavelength = 4.23 x 10^-7 meters or approximately 423 nanometers (nm).

Therefore, the wavelength of indigo light with a frequency of 7.08 x 10^14 Hz is approximately 423 nm.

The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

The expected blood gas values for this patient at the time of admission of patient is option E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

A 20-year-old woman presents to the Emergency Department with persistent symptoms of palpitations, dizziness, sweating, and paresthesia. She has a history suggestive of an anxiety disorder.

To assess her condition, blood gases and electrolytes are ordered, and a positron emission tomography (PET) scan is performed. The PET scan reveals increased perfusion in the anterior portion of each temporal lobe. Based on these findings, the doctor prescribes a benzodiazepine medication.

The expected blood gas values at the time of admission can be determined by analyzing the given options:

A. pH 7.51; PaCO₂ = 49 mm Hg; [HCO₃]⁻ = 38 mEq/L; Anion Gap = 12 mEq/L

B. pH 7.44; PaCO₂ = 25 mm Hg; [HCO₃]⁻ = 16 mEq/L; Anion Gap = 12 mEq/L

C. pH 7.28; PaCO₂ = 60 mm Hg; [HCO₃]⁻ = 26 mEq/L; Anion Gap = 12 mEq/L

D. pH 7.28; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 16 mEq/L; Anion Gap = 25 mEq/L

E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

By evaluating the options, the most appropriate choice is:

E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

This option presents a higher pH (alkalosis) and a decreased PaCO₂ (respiratory alkalosis), which could be consistent with the patient's symptoms of hyperventilation due to anxiety. The [HCO₃]⁻ level within the normal range and a normal anion gap further support this interpretation.

In summary, the expected blood gas values for this patient at the time of admission are a higher pH, decreased PaCO₂, normal [HCO₃]⁻, and a normal anion gap, indicative of respiratory alkalosis likely caused by hyperventilation related to her anxiety disorder.

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Answer:

Hiii

Explanation:

Your answer is Atmosphere

The atmosphere protects life on Earth by absorbing ultraviolet solar radiation and warming the surface through heat retention (the greenhouse effect). The atmosphere is further classified into multiple layers by temperature, which include the thermosphere, the mesosphere, the stratosphere, and the troposphere.

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Answer:atomic number 10 noble gas

Explanation:

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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Because they lack the stiffness required for alignment, molecules with only single bonds do not generally display liquid-crystalline characteristics. One or more atoms make up a molecule. The biological substances, such as proteins and DNA, can be composed of thousands of the atoms.

A molecule is composed of atoms that have been joined together. So, whereas an atom is a separate thing, a molecule is generated when those atoms come together. These elements are may be the same, such as the two oxygen atoms bonded together (O2), or they may be different atoms linked together, such as the water (H2O).

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According to the forces of attraction , ice is a solid which will melt under applied pressure.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

The answer would be D.

: )

Explanation:

The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.

Oxygen tanks are those in which the oxygen is filled in the liquid form by giving pressure to it with the help of a piston due to more pressure the molecules of oxygen become close.

As the molecule of the oxygen gas is closed to each other they are condensed and changes their state from a gaseous state to a liquid state.

By providing more pressure to the oxygen tank the gas molecules increases due to the decrease in the surface of the tank and molecules condense to liquid form.

Therefore, The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.

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Answer:

Volume also reduced to half

Explanation:

Volume and absolute temperature are directly proportional to each others

In the acid-base reaction H3O+ + OH- → 2H2O, the H3O+ ion transfers a proton (H+). This is a classic example of a neutralization reaction where the acidic H3O+ ion and the basic OH- ion combine to form water (H2O) molecules. The transfer of a proton from the H3O+ ion to the OH- ion results in the formation of two water molecules, which are neutral in nature.

1. H3O+ (hydronium ion) acts as an acid, while OH- (hydroxide ion) acts as a base.
2. The acid (H3O+) donates a proton (H+) to the base (OH-).
3. OH- accepts the proton (H+) and forms a water molecule (H2O).
4. The reaction results in the formation of 2 water molecules, as shown in the balanced equation: H3O+ + OH- → 2H2O.

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At 46.40 degrees Celsius and 897.00 mmHg, 6.20 liters of oxygen gas will contain a mass of 26.37 grams.

Oxygen is an element that is essential to life as we know it. It is a colorless, odorless, tasteless gas that makes up about 21% of the Earth's atmosphere. In its natural form, oxygen is made up of molecules of two oxygen atoms bonded together. Oxygen is vital to all living organisms, including humans, and is necessary for respiration and combustion. Oxygen plays a major role in many chemical processes, such as the burning of fuel, the corrosion of metals, and the formation of acids and bases. It is also an important component of environmental cycles, such as the water cycle and the carbon cycle.

897.00 mmHg = 897.00 mmHg × (1 atm / 760 mmHg) ≈ 1.17934 atm

46.40 °C + 273.15 = 319.55 K

Now, let's rearrange the ideal gas law equation to solve for the number of moles (n):

n = PV / RT

Plugging in the given values:

n = (1.17934 atm × 6.20 L) / (0.0821 Latm/molK × 319.55 K)

Simplifying the equation, we find:

n ≈ 0.2839 moles

To calculate the mass of O₂ gas, we need to multiply the number of moles by the molar mass of O₂:

Molar mass of O₂ = 32.00 g/mol

Mass of O₂ = 0.2839 moles × 32.00 g/mol ≈ 9.0928 g

Therefore, there are approximately 9.0928 grams of O₂ gas in the 6.20 L container at a pressure of 897.00 mmHg and a temperature of 46.40°C.

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E. All the above are frequently cited OSHA violations of safe ladder use.

The Occupational Safety and Health Administration (OSHA) has specific regulations for ladder use in the workplace to ensure worker safety. All of the options listed are common violations of these regulations.

A ladder not extended 3 feet above the landing can cause a worker to lose their balance while stepping off the ladder, resulting in falls and injuries. Lack of worker training on the proper use of ladders can lead to accidents and injuries. Failure to secure the ladder against movement can cause the ladder to slip or tip over, leading to falls. Finally, standing on the top step of a stepladder is not safe and can lead to falls, as the top step is not designed to support a worker's weight.

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o2 is made and hydrogen help make it

The hydronium ion concentration of the solution is  7.94 × 10⁻¹² M.

The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration  [H+] of the given solution.

From the formular;

pH = -log[ H⁺ ]

pH + pOH = 14

First we find the pH

pH + pOH = 14

Plug in pOH = 2.6

pH + 2.9 = 14

pH = 14 - 2.9

pH = 11.1

Now, from the above expression;

pH = -log[ H⁺ ]

Plug in pH = 11.1

11.1  = -log[ H⁺ ]

Hence;

[ H⁺ ] = 10^(-11.1)

[ H⁺ ] = 7.94 × 10⁻¹² M

Therefore, Hydroxide ion concentration is 7.94 × 10⁻¹² M.

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The total number of moles contained in 115 grams of C₂H5OH is 2.50 moles .

The term "mole" refers to the quantity of a substance that has the same amount of subatomic particles (ions, molecules, or atoms) as there are carbon atoms.

Atomic weight of carbon(C)= 12 gm

Atomic weight of Hydrogen (H)=1 gm

Atomic weight of oxygen (o)=16 gm

∴Molecula weight of C2H5OH =(12×2 + 1×6 + 16×1) gm

24 + 6 + 16 gm = 46 gm

∴ 46 gm of C2H5OH contains 1 mole

1 gm of C2H5OH contain = 1/46 moles

115 gm of C2H5OH contains = 115×1/46 moles

⇒2.5 moles

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Answer:

1

Explanation:

Formula of molarity is

\(M=\frac{n}{v}\)

M= molarity

n= no of moles

v= volume in liters (if mL then you have to convert it to L)

(R)-3-bromo-2,3-dimethylpentane.

The product that was created using Markovnikov's rule is considered to be the major product out of the two conceivable products.Most of the time, this substance will form (70%–95%).The minor product is the name for the substitute.

Carbohydrates, lipids, protein, and nucleotides are organic molecules necessary for human function.

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