(a) Why is the heat of fusion ( ΔHfus )of a substance smaller than its heat of vaporization ( ΔHvap ) ?

Answer:

D

Explanation:

A. is wrong.  1cm³ = 1 mL

B. is wrong   1000 mL = 1 L

C. is wrong   1 m = 10 dm

D. is correct there are 100 centigrams in 1 gram

Answer:

bile salts emulsify fats and break them down into smaller particles which gives the enzyme lipase a greater surface area to act on during digestion of fats.

Explanation:

Answer:

100°C And will be same. Your best bet is to calculate your answer. Explanation:

Answer:

a

Explanation:

Answer: It is true.

Explanation: the statement is true because any foreign particle in a chemical disrupts the melting and boiling points. Therefore, a smaller or larger amount of energy is required to melt the chemical.

Surface tension increases by increasing the intermolecular forces.

The following information should be considered -

What increases the surface tension?

What increases with increasing intermolecular forces?

Higher its boiling point. The harder it is for a liquid to escape into the vapor phase, the more energy is required to do so, and the higher the intermolecular forces between the liquid particles.

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The last one is endothermic, as you can notice we are using up energy (absorbing energy) in order for the reaction to occur.

Whereas the other ones release energy, as they are considered exothermic.

The pH values at which amino acid have the best buffering capacity are 2.34 and 9.69.

The largest buffering capabilities of monoamino monocarboxylic acids are found in the two pH ranges closest to their pK′ values. Buffer capacity refers to the ability of a solution to resist changes in pH which can be either absorbing or desorbing H+ and OH- ions. It is the moles of an acid or base required to change the pH of a solution by 1, divided by the pH change and the volume of buffer in liters. Buffer capacity is a unitless number. When an acid or base is added to a buffer system, the pH change can be small or large which depends on both the initial pH and the capacity of the buffer to resist change in pH. Hence, a buffer resists changes in pH due to the addition of an acid or base though consumption of the buffer.

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Answer:

B. 96.12 g

Explanation:

To solve this question we must convert each reactant to moles. Using the balanced equation we can find limiting reactant. With moles of limiting reactant we can find the moles of methanol and its mass:

Moles CO -Molar mass: 28.01g/mol-

140.1g CO * (1mol / 28.01g) = 5.0 moles CO

Moles H2 -Molar mass: 2.01g/mol-

12.12g * (1mol / 2.01g) = 6.03 moles H2

For a complete reaction of 5.0 moles of CO are required:

5.0moles CO * (2mol H2 / 1mol CO) = 10.0 moles of H2 are required

As there are just 6.03 moles, H2 is limiting reactant.

The moles of methanol produced are:

6.03 moles H2 * (1mol CH3OH / 2mol H2) = 3.015 moles CH2OH

Mass CH3OH -Molar mass32.04g/mol-:

3.015 moles CH2OH * (32.04g/mol) =

96.6g CH3OH ≈ B. 96.12 g

Given what we know, we can confirm that John Dalton was the first person to show strong empirical evidence for the existence of atoms.

Therefore, given his proposal of the atomic theory and the experiments he carried out to provide evidence to support his claims, we can confirm that John Dalton was the first person to show strong empirical evidence for the existence of atoms.

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Answer:

。    •  　ﾟ  。  　.

 　.      .    　。   。  

.   。      ඞ 。 .    •      

　ﾟ    you  are  the Impostor.  。　.

 '  　0 Impostors remain    　。

 ﾟ  　.  　. ,    .  .

Explanation:

We have acquired a sense of measurement through millions of years of living because measurement is necessary for us to comprehend the outside world. Tools that supply scientists with a quantity are needed for measurements. Here the precision is 324 g. The correct option is A.

Accuracy is the capacity of an instrument to measure the precise value. In other words, it refers to how closely the measured value resembles a reference or genuine value. Small readings can be taken to increase accuracy. The calculation's inaccuracy is decreased by the little reading.

The precision of a substance is defined as the degree to which two or more measurements agree with one another. Here mass of object is 300 g and 324 g is close to it.

Thus the correct option is A.

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Answer:

Atoms of non metals

Explanation:

Hope it helps!

Answer:

The reducing agent donates electron to the oxidizing agent and gets oxidized itself

Explanation:

In an oxidation-reduction reaction, also known as REDOX reaction, one of the reactants is called OXIDIZING AGENT while the other is called REDUCING AGENT. The reducing agent is called so because it reduces another substance in the reaction.

It reduces another atom/ion by donating electrons to that atom, hence, getting oxidized itself in the process. For example, in the following reaction:

H2 + F2 → 2HF

Fluorine is getting oxidized from -2 to 0 by donating electrons to H and reducing it from +2 to 0.

Answer:

Reduces another atom

Explanation:

:)

Answer:

Tissues And Organ Systems

Explanation:

Answer:

When a gas is heated, the molecules move faster and spread out, resulting in an increase in volume. When a liquid is heated, the molecules move faster and spread out, resulting in an increase in volume and a decrease in viscosity. When a solid is heated, the molecules vibrate faster and the solid expands, resulting in an increase in volume.

Explanation: Enjoy have a good day:D

1. From the ideal gas law, the variables and their units are as follows:

2. In a sealed bottle, when the temperature is raised from 200 K to 400K;

3. A life raft containing 200 g of air has another 200 g of air added.

Two quantities in the ideal gas equation that are directly proportional: temperature and volume

Two quantities in the ideal gas equation that are indirectly proportional: volume and pressure

The number of moles of the gas present in the container is 0.162 moles.

The number of moles of the gas present is calculated using the ideal gas law as follows:

PV = nRT

n = PV/RT

P = 1.8 atm

V = 2 L

G = 0.0821(L⋅atm) / (mol⋅K)

T = 270 K

n = 1.8 * 2 / 270 * 0.0821

n = 0.162 moles

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Answer:

the answer is homologous

Hope you have a good day :)

Answer:

high melting points.

good conductors of electricity.

good conductors of heat.

high density.

malleable.

ductile.

Explanation:

Here is ur paragraph:

Metals have many interesting properties. Metals have high melting points, for example, Gold's melting point is 1948 degrees Fahrenheit. They are also good conductors of heat and electricity. They have high density and are malleable. They are also ductile. Platinum and Gold are very widely used for these reasons.

Answer:

q

=

64 kJ this is answer. .

Answer:

A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass.

Explanation:

By nature, unpolluted rainfall has a pH of between 5.0 and 5.6. Thus, option (b) is the correct answer.

Unpolluted rain refers to natural rain that is unaffected by pollution in the air and water. Such rain is not devoid of particulate matter but has particulate matter such as soil particles present.

Unpolluted rain is also known as clean rain. This rain is slightly acidic in nature as the carbon dioxide and rainwater react together to form carbonic acid. Carbonic acid is a weak acid that is responsible for the slight acidity of rainwater.

\(H_20+CO_2--- > H_2CO_3\)

If the pH falls down below 4.4, the rain is said to be acid rain.

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Answer:

94,200 milligrams in 94.2 grams

To get answer multiply 94.2 by 1000.

Answer:

there is 94,200 milligrams in 94.2 grams

Explanation:

hope this helps, because 1,000 milligram is 1 gram

so 1,000x94.2(grams)=94,200

HOPE THIS HELPS A LITTLE

Explanation:

the answer for the above

is b)0.019

Answer:

In diamond the carbon atoms are covalently bonded as flat sheets

In silicon(IV) dioxide the silicon and oxygen atoms are covalently bonded in flat sheets

The structure of copper includes a lattice of positive ions

Explanation:

Diamond and silicon(IV) dioxide are covalent network solids. Covalent network solids are made up of atoms joined to one another by covalent bonds to form a giant lattice, The solids are hard and have a very high melting point. They do not conduct electricity. So, for both diamond and SiO2, atoms are covalently bonded to yield flat sheets in a covalent bonded network solid.

Copper is a metallic substance having metallic bonds, a metallic crystal consists of positive ions and a cloud of electrons.

Answer:

A. physical change

b. physical change

c. chemical change

d. chemical change

In Lei's experiment, one step of the procedure requires her to bring some water to a boil. Lei should use OC.a Bunsen burner and a balance.

Because it can operate with a variety of gases, has a single flame, and allows for adjustable heat output, the Bunsen burner is crucial in laboratories. Scientists utilize a variety of beakers in the lab. Scientists mix and track the responses of various compounds within them.

The following are three general safety guidelines when using a Bunsen burner: Never leave the lab with the burner on and never leave open flames unattended. Once the gas has been used up, turn it off. Before handling the burner, allow it to cool. Before leaving the lab, make sure the main gas valve is closed.

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Answer:

Ionization energy

Electron affinity

Electronegativity

Explanation:

A  plastic container covered with a dinner plate  is used in the store raw poultry. Hence option b is correct.

Poultry is defined as several bird species that are raised on farms for food, fiber, or entertainment. The most crucial sense for all birds, including hens, is vision.

Raw fowl should be kept in a bowl or on a tray in the bottom of the refrigerator. Your refrigerator should be kept at a minimum temperature of 38 to 40 degrees Fahrenheit. Only one to two days should be allowed for fresh, raw poultry. Rinsing poultry before cooking is no longer advised.

Thus, a plastic container covered with a dinner plate  is used in the store raw poultry. Hence option b is correct.

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