Based on the final state, which statement is true about the substances in the petri dishes?

47. True.In the small intestine, chylomicrons, which are large lipoprotein particles, are indeed picked up by lymphatic vessels called lacteals. Chylomicrons contain dietary fats (triglycerides) and are responsible for transporting these fats from the small intestine to the lymphatic system and eventually to the bloodstream.

On the other hand, simple sugars and amino acids, which result from the digestion of carbohydrates and proteins, respectively, are directly absorbed into the bloodstream through the small intestine's capillaries. They do not require the lymphatic system for transport and enter the blood directly.

48.True.Cytosol is indeed the intracellular fluid present within the cytoplasm of cells. It is a gel-like substance that surrounds the organelles and other cellular structures. Cytosol consists of water, ions, small molecules, and various proteins that are dissolved or suspended within it. It plays a crucial role in cellular metabolism, transport of molecules, and the overall functioning of the cell.

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1. 2×10−5molA 1. 2×10−5mol sample of ca(oh)2 is dissolved in water. The pH o steh sample is

pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.

The ca(oh)2 sample is 1. 2×10−5 mol.

To calculate the pH, the formula is pH = -log[H3O+]

First, calculate the molarity of ca(oh)2 is 4.8 x 10-5M

[OH-] = 9.6 x 10-5M

[OH-][H3O+] = kw (1.0 x 10-14)

[H3O+] =  kw /  [OH-]    

[H3O+] = 1.0 x 10-14 / 9.6 x 10-5

[H3O+]= 1.04 x 10-10M

pH= -log[1.04 x 10-10M]

pH= 9.98

Thus, the pH is 9.98

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The reason acetyl chloride reacts with water almost violently is because it is a highly reactive compound due to the presence of the polar functional group, chloride.

Chloride ions are highly electronegative and have a strong affinity for water molecules. When acetyl chloride is added to water, the chloride ions attract water molecules, causing the reaction to occur quickly and violently.

On the other hand, benzoyl chloride has a longer carbon chain and is less reactive than acetyl chloride. This means that the reaction with water is slower and requires a higher energy input, such as warming and shaking the mixture. The longer carbon chain also makes it less polar than acetyl chloride, which means it is less attracted to water molecules and therefore does not react as violently.

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Water is a polar molecule due to its bent molecular geometry and the electronegativity difference between oxygen and hydrogen.

The oxygen atom in water is more electronegative than hydrogen, resulting in an uneven distribution of charge within the molecule.Since the majority of hydrocarbon bonds are nonpolar, they do not readily interact with polar substances like water. The nonpolar nature of hydrocarbons leads to a lack of significant electrostatic interactions between the hydrocarbon molecules and water molecules. As a result, hydrocarbons are generally insoluble in water.It is important to note that option c) they exhibit considerable molecular complexity and diversity, and option d) they are less dense than water, are not accurate explanations for the insolubility of hydrocarbons in water. The solubility of hydrocarbons in water primarily depends on the polarity of the hydrocarbon molecules and their ability to interact with water molecules.

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The nucleus of the radioactive carbon isotope before any decay contains 6 protons and 8 neutrons.

The radioactive carbon isotope mentioned in the passage is most likely carbon-14 (C-14). Carbon-14 has an atomic number of 6, which means it has 6 protons in its nucleus. Protons are positively charged particles found in the nucleus of an atom.

To determine the number of neutrons in the nucleus of carbon-14, we need to subtract the atomic number (protons) from the atomic mass. Carbon-14 has a mass number of 14, so subtracting the atomic number of 6 from the mass number gives us 8 neutrons.

Therefore, the nucleus of the radioactive carbon isotope before any decay contains 6 protons and 8 neutrons.

In summary:
- Atomic number of carbon-14: 6
- Protons in the nucleus: 6
- Mass number of carbon-14: 14
- Neutrons in the nucleus: 14 - 6 = 8


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The general physical and chemical properties of acids are Sour taste, Reactivity with metals, Ability to conduct electricity, Corrosive nature, pH below 7, Reactivity with bases, and Ability to donate protons.

The general physical and chemical properties of acids are as follows:

1. Sour taste: Acids often have a sour taste, although it is important to note that tasting acids directly can be dangerous and is not recommended.

2. Reactivity with metals: Acids can react with certain metals, producing hydrogen gas and forming metal salts.

3. Ability to conduct electricity: When acids are dissolved in water, they ionize and produce positively charged hydrogen ions (H+). These ions enable the solution to conduct electricity.

4. Corrosive nature: Acids have the ability to corrode or dissolve certain materials, including metals and other substances.

5. pH below 7: Acids have a pH value lower than 7 on the pH scale, which measures the acidity or alkalinity of a solution. The lower the pH value, the stronger the acid.

6. Reactivity with bases: Acids and bases can undergo neutralization reactions, where they react to form water and a salt.

7. Ability to donate protons: Acids are proton donors. They can release hydrogen ions (H+) in a solution.

In conclusion, acids exhibit specific physical and chemical properties that distinguish them from other substances. These properties, such as sour taste, reactivity with metals, ability to conduct electricity, corrosive nature, low pH, reactivity with bases, and proton donation.

This help defines and identify acids in various contexts, including chemical reactions, industrial processes, and biological systems. Understanding the properties of acids is crucial in fields such as chemistry, medicine, and environmental science.

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The number of the hydrogen atoms that would be required from the diagram is 10.

A Saturated compound has all its carbon atoms connected by single bonds, and each carbon atom is bonded to the maximum number of hydrogen atoms possible. This arrangement allows the compound to have no available or unsaturated bonds for additional atoms.

The compound that is shown must be butane as such the number of the hydrogen atoms that it contains is a total of ten.

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The nuclear model of the atom was proposed by Rutherford and his co-workers in 1911.

The model was a result of their famous alpha-particle scattering experiment. The experimental evidence for the development of the nuclear model of the atom was given by the alpha-particle scattering experiment.In this experiment, a thin gold foil was bombarded with alpha particles.

It was observed that most of the alpha particles passed straight through the foil, but a few of them were deflected by large angles. Some of the alpha particles even returned back to the source.This observation was contrary to the plum pudding model of the atom proposed by Thomson.

According to this model, the positive charge of the atom was concentrated in a very small volume called the nucleus. The electrons revolved around the nucleus in circular orbits. The nuclear model of the atom explained the experimental results of the alpha-particle scattering experiment and became the basis for our current understanding of the atomic structure.

In conclusion, the experimental evidence for the development of the nuclear model of the atom was given by the alpha-particle scattering experiment which was a result of Rutherford and his co-workers in 1911.

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Answer:

ice.

Explanation:

it becomes a liquid

Answer:

At -20°C the mercury state will be liquid

Explanation:

The melting point of a substance is the temperature at which it changes from solid state to a liquid state, and the boiling point is the temperature at which it changes from liquid state to a gaseous state.

If mercury melts at -39°C and boils at 356.9°C, it means that if the temperature is lower than -39°C, mercury will remain al solid state. Between -39°C and 356.9°C, the state of mercury will be liquid and, above 356.9°C mercury will remain at gaseous state.

So, at -20°C the mercury state will be liquid, because that temperature it is between -39°C and 356.9°C.

Answer:

I THINK PHYSICAL EVIDENCE IS THE MOST USEFUL IN AN INVESTIGATION BECAUSE IT IS THE MOST BLACK AND WHITE OUT OF ALL THE TYPES OF EVIDENCE. IT'S ONE THING TO LISTEN TO A TESTIMONY OR LOOK AT DOCUMENTS, BUT IT'S ANOTHER THING TO HAVE THE SUSPECT'S DNA AT THE CRIME SCENE.

Explanation:

Answer:

Trace evidence is most importent because it leads to the person who comited the crime faster than normal evidence. Finger prints, hair, skin cells, and fingernails are examples of trace evidence. No two people have the same DNA or print unless their identical twins so this can find out who the guilty person is esely but you still need to find the story to how and what the person did makeing physical evidence the secend most importent.

Explanation:

Answer: Halogens

Explanation:

Halogens include elements like Fluorine, Chlorine, Iodine and Bromine. These  elements can be dangerous to humans especially when used in large quantities.

When combined with other elements however, they can form very useful materials. Chlorine for instance forms salt when combined with sodium. Fluorine becomes very useful in toothpaste to protect teeth and bromine can be used in pesticides.

Answer:

Sleet and hail, sleet are tiny drops of water that freeze when it rains. Hail forms when a thunderstorm lifts a water droplet above the freezing level.

Explanation:

From the reactions, 1.04 g of H2 and 7.995 g of aluminum phosphate is produced.

The term stoichiometry has to do with the amount of substances that participates in a reaction.

For reaction 1;

Mg + 2HCl → MgCl₂ + H₂

Number of moles of Mg reacted =  12.5 g/24g/mol = 0.52 moles

If 1 mole of Mg produced 1 mole of H2

0.52 moles produces 0.52 moles of H2

Mass of H2 =  0.52 moles * 2 g/mol = 1.04 g

For reaction 2;

2Li3PO4 + Al2(SO4)3 → 3Li2SO4 + 2AIPO4

Number of moles of lithium phosphate =  7.5 g/116 g/mol = 0.065 moles

2 moles of Li3PO4 produced 2 moles of AIPO4

0.065 moles of  Li3PO4 produced 0.065 moles of AIPO4

Mass of AIPO4  = 0.065 moles  * 123 g/mol = 7.995 g

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Answer: d. 47.4%

What is the percent yield of lithium hydroxide from a reaction of 7.40 g of lithium with 10.2 g of water? The actual yield was measured to be 12.1 g.

Empirical formula of the compound that contains 72.0% carbon, 12.0% hydrogen, and 16.0% oxygen by mass is C₆H₁₂O₆.

To determine the empirical formula, we need to find the simplest whole number ratio of the elements present in the compound. In this case, we are given the mass percentages of carbon, hydrogen, and oxygen.

Assuming we have 100 g of the compound, we can calculate the masses of carbon, hydrogen, and oxygen in grams:

- Mass of carbon = 72.0 g (72.0% of 100 g)

- Mass of hydrogen = 12.0 g (12.0% of 100 g)

- Mass of oxygen = 16.0 g (16.0% of 100 g)

Next, we need to convert these masses to moles by dividing them by their respective molar masses:

- Moles of carbon = Mass of carbon / Molar mass of carbon = 72.0 g / 12.01 g/mol = 6.0 mol

- Moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen = 12.0 g / 1.01 g/mol = 11.9 mol (approximately)

- Moles of oxygen = Mass of oxygen / Molar mass of oxygen = 16.0 g / 16.00 g/mol = 1.0 mol

Since we want to find the simplest whole number ratio, we divide the number of moles by the smallest number of moles (in this case, 1.0 mol):

- Moles of carbon = 6.0 mol / 1.0 mol = 6.0

- Moles of hydrogen = 11.9 mol / 1.0 mol = 11.9 (approximately)

- Moles of oxygen = 1.0 mol / 1.0 mol = 1.0

Rounding the ratios to the nearest whole number, we get the empirical formula C₆H₁₂O₆, indicating that the compound contains 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms in its empirical formula.

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The calculated molar ratio of iron to oxygen in BIFs is 1.452.

Comparing this ratio to the molar ratios of Hematite (1:0.75) and Magnetite (1:0.67), we can see that the calculated value of 1.452 is closest to the Hematite molar ratio of 1:0.75. Therefore, Hematite is the more dominant iron component in BIFs.

To calculate the mass of oxygen contained within BIFs, we'll use the given information:

Total mass of the modern atmosphere = 5.01×10¹⁸ kg

Percentage of oxygen in the modern atmosphere = 21%

Mass of oxygen contained within the modern atmosphere = (5.01×10¹⁸ kg) × (0.21) = 1.051×10¹⁸ kg

Percentage of oxygen contained in BIFs = 6.6% (given)

Mass of oxygen contained within BIFs = (6.6% of 1.051×10¹⁸ kg) = 6.6/100 × 1.051×10¹⁸ kg = 6.9166×10¹⁶ kg

Therefore, the mass of oxygen contained within BIFs is 6.9166 × 10¹⁶ kg.

To calculate the number of moles of oxygen contained within BIFs, we'll use the molecular mass of O₂:

Molecular mass of O₂ = 0.032 kg/mole

Number of moles of oxygen contained within BIFs = (Mass of oxygen in BIFs) / (Molecular mass of O₂)

= (6.9166×10¹⁶ kg) / (0.032 kg/mole) = 2.1614375 × 10¹⁸ moles

Therefore, the number of moles of oxygen contained within BIFs is 2.1614375 × 10¹⁸ moles.

Next, let's calculate the mass of iron in BIFs:

Total mass of BIFs = 5.0×10¹⁷ kg

Percentage of iron in BIFs = 35%

Mass of iron contained within BIFs = (35% of 5.0×10¹⁷ kg) = 35/100 × 5.0×10¹⁷ kg = 1.75×10¹⁷ kg

To calculate the number of moles of iron contained within BIFs, we'll use the atomic mass of iron:

Atomic mass of iron = 0.0558 kg/mole

Number of moles of iron contained within BIFs = (Mass of iron in BIFs) / (Atomic mass of iron)

= (1.75×10¹⁷ kg) / (0.0558 kg/mole) = 3.1367419 × 10¹⁸ moles

Therefore, the number of moles of iron contained within BIFs is 3.1367419 × 10¹⁸ moles.

Finally, let's calculate the molar ratio of iron to oxygen in BIFs:

Molar ratio of iron to oxygen = (Number of moles of iron) / (Number of moles of oxygen)

= (3.1367419 × 10¹⁸ moles) / (2.1614375 × 10¹⁸ moles)

≈ 1.452

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Type of chemical reaction looking at the given products and reactants in the chemical equation.

When atoms' chemical bonds are established or ruptured, chemical processes take place. The materials that initiate a chemical reaction are known as reactants, while the materials created as a result of the reaction are known as products. Although a chemical reaction is not necessarily a "one-way street," as we'll examine further in the following section, it is usually shown by an arrow between the reactants and products. Some chemical processes just go in one way until all of the reactants have been utilised. It is said that these reactions cannot be stopped. But some reactions can be classified as reversible. Reactions that are reversible have the ability to move both forward and backward.

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Answer:

A. Their numbers of atoms

Explanation:

The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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The two everyday examples of the thermal energy of a substance being decreased are:

Instant cold pack

Cooling food

Thermal energy is the total internal energy of an object or substance, arising from the motion and vibration of its atoms and molecules. It is a type of kinetic energy that is associated with the temperature of the object or substance. Thermal energy is often measured in units of joules (J) or calories (cal). It can be transferred from one object or substance to another through the processes of conduction, convection, and radiation.

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Answer:

It is an example of natural selection (option c)

Natural selection is demonstrated by a green rat snake living within that grass as well as a brown rat snake living throughout the desert.

The process throughout which communities of sentient creatures adapt but instead transform is known as natural selection. Persons within a demographic are inherently varied, which means they are all unique under certain manner.

This variance indicates that certain people have qualities that are more adapted to their surroundings over others.

Thus "Option C" is correct.

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For 874 mL you should use a P1000 pipette;For 57 mL, 340 mL you should use a P200 pipette;For 15 mL you should use a P20 pipette.

For 874 mL you should use a P1000 pipette. This is because the P1000 has a maximum volume capacity of 1000 mL, so it can easily accommodate the 874 mL volume.

For 57 mL you should use a P200 pipette. This is because the P200 has a maximum volume capacity of 200 mL, so it can easily accommodate the 57 mL volume.

For 340 mL you should use a P200 pipette. This is because the P200 has a maximum volume capacity of 200 mL, so it can easily accommodate the 340 mL volume.

For 15 mL you should use a P20 pipette. This is because the P20 has a maximum volume capacity of 20 mL, so it can easily accommodate the 15 mL volume.

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Answer:

The second student with mass 70kg has more momentum

Explanation:

Using the formula:

p = m × v

Where;

p = momentum (kgm/s)

m = mass (kg)

v = velocity (m/s)

According to this question, two students are running in a cross country race.

Student 1 has the following; m = 60kg, v = 7m/s

Student 2 has the following; m = 70kg, v = 7m/s

Using p = mv

Student 1, p = 60 × 7 = 420 kgm/s

Student 2, p = 70 × 7 = 490 kgm/s

From the result of the above calculations, student 2 with mass 70kg has more momentum.

\(\text{Molarity,}~ S= 2.1~mol/L\\\\\text{Molar mas of}~ NaHCO_3, ~M=84~~ g/mol\\\\\text{Volume,}~~ V = 1 ~L\\\\\text{Mass,} ~w = ?\)

\(\text{ We know that,}\\\\~~~~~S = \dfrac{n}V\\\\\implies n = SV\\\\\implies \dfrac{w}{M} = SV\\\\\implies w = SVM\\\\\implies w= 2.1 \times 1 \times 84\\\\\implies w =176.4 ~ g\)

The ball and stick models of the given molecules are described as follows:

O₂ : two atoms of oxygen linked by double bonds

H₂ : two atoms of hydrogen linked by single bonds

H₂O : two atoms of hydrogen linked to an oxygen atom by single bonds

CO₂ : two atoms of carbon linked to an oxygen atom by double bonds

NH₃ : three atoms of hydrogen linked a nitrogen atom by single bonds

CH₄ : four atoms of hydrogen linked a carbon atom by single bonds

Models are representations of concepts, ideas or substances using pictures, graphs or illustration.

Models are used by scientists to describe processes such as the carbon cycle, water cycle as well as molecules such as oxygen, water, and other chemical substances.

The ball and stick models of the given molecules are described as follows:

O₂ : two atoms of oxygen linked by double bonds

H₂ : two atoms of hydrogen linked by single bonds

H₂O : two atoms of hydrogen linked to an oxygen atom by single bonds

CO₂ : two atoms of carbon linked to an oxygen atom by double bonds

NH₃ : three atoms of hydrogen linked a nitrogen atom by single bonds

CH₄ : four atoms of hydrogen linked a carbon atom by single bonds

In conclusion, a model gives a physical representation of a concept, molecule or event.

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Answer:

164.3g of NaCl

Explanation:

Based on the chemical equation:

CaCl2 + 2NaOH → 2NaCl + Ca(OH)2

where 1 mole of CaCl2 reacts with 2 moles of NaOH

To solve this question we must convert the mass of CaCl2 to moles. Using the chemical equation we can find the moles of NaCl and its mass:

Moles CaCl2 -Molar mass: 110.98g/mol-

156.0g CaCl₂ * (1mol / 110.98g) = 1.4057 moles CaCl2

Moles NaCl:

1.4057 moles CaCl2 * (2mol NaCl / 1mol CaCl2) = 2.811 moles NaCl

Mass NaCl -Molar mass: 58.44g/mol-

2.811 moles NaCl * (58.44g / mol) = 164.3g of NaCl

Answer:

2.7 moles of Fe₂O₃ is the maximum amount that can be produced. Iron is the limiting reactant.

Explanation:

The balanced reaction is:

4 Fe + 3 O₂ → 2 Fe₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

You can use a simple rule of three as follows: if by stoichiometry 4 moles of Fe reacts with 3 moles of O₂, how much moles of Fe will be needed if 4.7 moles of O₂ react?

\(moles of Fe =\frac{4. moles of Fe*4.7 moles of O_{2}}{3 moles of O_{2} }\)

moles of O₂= 6.27

But 6.27 moles of Fe are not available, 5.4 moles are available. Since you have less moles than you need to react with 4.7 moles of O₂, iron Fe will be the limiting reagent.

So you can use a simple rule of three as follows: if by stoichiometry 4 moles of Fe produce 2 moles of Fe₂O₃, how many moles of Fe₂O₃ will be produced if 5.4 moles of Fe react?

\(moles of Fe_{2}O_{3}=\frac{5.4 moles of Fe*2 moles of Fe_{2} O_{3} }{4 moles of Fe}\)

moles of Fe₂O₃= 2.7 moles

Then:

2.7 moles of Fe₂O₃ is the maximum amount that can be produced. Iron is the limiting reactant.

Answer:

true

Explanation:

im smart

Answer:

true, oxidation number for Cl2 = 0