What is the force that resists gravity?
Group of answer choices
Lift
Drag
Weight
Thrust

Explanation:

(a) the sublimation of dry ice [conversion of CO2(s) directly to CO2(g)]

The balanced equation is given as;

CO2(s) --> CO2(g)

This reaction is endothermic, hence; Heat is a reactant and is needed to start the reaction.

(b) the reaction of 1 mol of sulfur dioxide with oxygen.

The balanced equation is given as;

2SO2 + O2 --> 2SO3

This reaction is exothermic, hence; Heat is a product and is given off by the reaction.

Answer:

Alkyne

Explanation:

The homologous series for this compound is the Alkyne because of the presence of the triple bond present between the third and fourth carbon atoms as seen in the picture attached.

Answer:

Rocks

Explanation:

Answer:

silicate

Explanation:

Answer:

40

Explanation:

M = n/v  hope this helps :b

26.62 grams of HBr would be present in 355 mL of a 7.5% m/v HBr solution.

Concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution.

There are various methods of expressing the concentration of a solution.

Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.

Solutions of known concentration can be prepared either by dissolving a known mass of solute in a solvent and diluting to a desired final volume or by diluting the appropriate volume of a more concentrated solution (a stock solution) to the desired final volume.

Given,

HBr = 7.5% m/ v

This means 7.5g of HBr in 100 ml of the solution.

1 ml of the solution has 0.075g

355 ml of the solution will have = 0.075 × 355 = 26.62g of HBr

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\(\tt Kp=Kc(RT)^{\Delta n}\)

NH₄Cl (s) ⇔ NH₃ (g) + HCl (g)

Δn = 2 (gas only)

R = 0.082

T = 427 + 273 = 700 K

4.8 = Kc (0.082 x 700)²

Kc = 1.45 x 10⁻³

Answer:

False.

Explanation:

If the answer to this question was true, then that would mean that the more the solute is broken down, the less it'll dissolve... and everyone know that this doesn't make sense. I hope I explained this is an easy manner so you could understand! Good luck! :)

The more solute is broken down in solution the more conductive the solutions is and the statement is False.

Conductivity depends upon solvation of ions present in solution. Greater the solvation of ions, lesser is the conductivity.

Solvation is the process in which molecules of a solvent attract the particles of a solute.

The main forces in solvation are ion-dipole and hydrogen bonding attractions.

The more concentrated a solution is, the greater the conductivity measured (if the solute is a conductor in solution). This is because the higher the concentration of the solute, the more ions will be available to carry electric charge.

Therefore, the more solute is broken down in solution the more conductive the solutions is and the statement is False.

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Five is the total number of peaks due to singly charged ions in the complete mass spectrum of chlorine, \(Cl_{2}\)

How many peaks do \(Cl_{2}\)'s molecular ions have?

The mass spectra of compounds with a single chlorine atom show two molecular ion peaks. This is because there are two isotopes of chlorine, 35Cl and 37Cl.

The molecular ion and fragment ions will both have peaks in the mass spectrum. When a mass spectrum is interpreted, a specific molecule can be located, confirmed, or its quantity can be calculated. the base summit of a mass spectrum's tallest (strongest) peak, caused by the ion with the highest relative abundance

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Five is the total number of peaks due to singly charged ions in the complete mass spectrum of chlorine, \(Cl_{2}\).

How many peaks do 's molecular ions have?

The mass spectra of compounds with a single chlorine atom show two molecular ion peaks. This is because there are two isotopes of chlorine, 35Cl and 37Cl.

The molecular ion and fragment ions will both have peaks in the mass spectrum. When a mass spectrum is interpreted, a specific molecule can be located, confirmed, or its quantity can be calculated. the base summit of a mass spectrum's tallest (strongest) peak, caused by the ion with the highest relative abundance

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Explanation

Ionic solids, such as sodium chloride (NaCl) are composed of positive and negative ions that are held together by electrostatic attractions, which can be quite strong.

Many ionic crystals also have high melting points. This is due to the very strong attraction between the ions.

Although they are hard they also tend to be brittle, and they shatter rather than bend. Ionic solids do not conduct electricity; however, they do conduct when molten or dissolved because their ions are free to move. Many simple compounds formed by the reaction of a metal and a nonmetal element are ionic.

Answer: b. Ionic

correct answer is 63.22 amu.

Determining the atomic mass of an element requires calculating the weighted average of the masses of the two isotopes, taking into account their natural abundance. The atomic mass of an element is given by the formula:

Atomic mass = (mass of isotope 1 × natural abundance of isotope 1) + (mass of isotope 2 × natural abundance of isotope 2)

Inserting the values ​​given in the question gives:

Atomic mass = (62.9296 amu × 0.6915) + (64.9278 amu × (1 - 0.6915))

= 43.40 amu + 19.82 amu

= 63.22 am

Therefore, the atomic mass of the element is 63.22 amu.

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Mass of the tin = 31.4g

The volume of tin = 4.3 \(cm^{3}\)

The density of tin = D

We know that

\(Density = \frac{Mass}{Volume} \\D = \frac{31.4}{4.3} \frac{g}{cm^{3} }\)

\(D = 7.302 g/cm^{3}\) ≈ \(10 g/cm^{3}\)

Measurement of density contrasts the mass of an object with its volume. High density refers to the amount of matter in a given volume of an object. We shall discover what density is in this post, along with its definition and measurement systems.

The density of a substance indicates how dense it is in a particular area. Mass per unit volume is the definition of a material's density.

In essence, density is a measurement of how closely stuff is packed.

It is a special physical characteristic of a certain thing. The Greek scientist Archimedes made the discovery of the density principle.

If you are familiar with the formula and the relevant units, calculating density is simple. The letter D can also be used to signify density instead of the symbol.

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Answer:

m = 1125.9 g.

Explanation:

Hey there!

In this case, according to the given information, it turns out possible for us to solve this problem by using the definition of density as mass divided by volume:

\(d=\frac{m}{V}\)

Thus, we solve for the mass in the equation to obtain:

\(m=d*V\)

Then, we plug in the values to obtain:

\(m=2.70g/mL*417mL\\\\m=1125.9g\)

Regards!

Answer:

Explanation:

The relative speed and distance of atoms in a substance depend on the state of matter.

In a solid, atoms are closely packed together and have minimal movement or vibration. Their relative speed is low and their distance from one another is short.

In a liquid, atoms are still close together but have more movement and freedom of movement than in a solid. Their relative speed is slightly higher than in a solid, and their distance from one another is slightly longer.

In a gas, atoms are widely spaced and have a high degree of movement and freedom of movement. Their relative speed is much higher than in a solid or liquid, and their distance from one another is much greater.

In a plasma, atoms are ionized and have a high degree of movement and freedom of movement. Their relative speed is much higher than in a solid, liquid or gas, and their distance from one another is much greater.

ANSWER: From experience and observation, the pathogen that responds more faster to treatments are PARASITES.

This is because, our body are already used to parasite, as they feed and mostly live inside our body. Parasites becomes harmful to our body, when it is allowed to be much in the body, thereby weakening the immune system of the body. Intake of vaccination reduces the number of parasites in the body, which gives the immune system the chance of recovering and protecting the body.

Parasite does not replicate more faster like viruses and other pathogens. These makes it more easier for treatment to work more faster. They are also easily killed by taking the proper treatment, and the rate of their replications are very slow when compared to the rate of their death when vaccinated.

Some example disease caused by parasites are:

1) Giardiasis

2) Trichomoniasis

3) Malaria

4) Toxoplasmosis

5) Intestinal worms

6) Pubic lice

All this disease above responds very fast to medical treatment, unless when they is complications, which are mostly when the parasite has been allowed to cause more harm and replicate much in the body, without any treatment. This is why doctors advice patients that lives at the tropical regions to periodically vaccinate themselves on parasitic infections.

The molecular weight of unknown gas : 23.46 g/mol

Given

A vessel contains 10% of oxygen and 90% of an unknown gas.

diffuses rate of mixed gas = 86 s

diffuses rate of O₂ = 75 s

Required

the molecular weight of unknown gas (M)

Solution

The molecular weight of mixed gas :(M O₂=32 g/mol)

\(\tt 0.1\times 32+0.9\times M=3.2+0.9M\)

Graham's Law :

\(\tt \dfrac{r_{O_2}}{r_{mixed~gas}}=\sqrt{\dfrac{M_{mixed}}{M_{O_2}} }\\\\\dfrac{75}{86}=\sqrt{\dfrac{3.2+0.9M}{32} }\\\\0.76=\dfrac{3.2+0.9M}{32}\\\\24.32=3.2+0.9M\\\\21.12=0.9M\rightarrow M=23.46~g/mol\)

Answer:

negative charge

Explanation:

Neutrons have no charge, protons have positive charge, and electrons have a negative charge

Answer:

:N:::N:

Explanation: 10 valence electrons betwwen the 2

need an octet

and N needs 5 for a neutral formal charge

An acceptable Lewis structure for a diatomic nitrogen molecule is

:N:::N: .Option C is correct. This is further explained below.

Lewis structure for a diatomic nitrogen molecule simply refers to the triple bond exists between two nitrogen atoms in the N2 Lewis structure.

In conclusion, The nitrogen molecule is diatomic, which means it is made up of two atoms of the same element.

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Answer:

D. One soluble and one insoluble salts are formed

Explanation:

Answer: the temperature would increase

Explanation:

because if one spot on the earth got the same amount of light through the summer and winter it would have a severe amount of drought and nothing to cool it down since all off it evaperated

Answer:

I think D

Explanation:

Your cell phone number and your driver's license number are the numbers of your personal life that are exact.

In this context, an exact number refers to a number that if it undergoes any modification will not refer to the same thing that it referred to before that modification.

For example, my phone number is 12345. This number is exact because it cannot be changed because or else it would cease to be my phone number, that is, if someone wants to call me and writes the number 12346 it is no longer my number.

Addicionally, if my driver's license number is 112233 it is an exact number because if it is modified it would be the number of another driver.

According to the above, options B, C, and E are incorrect because they are inaccurate numbers because if they are modified they all refer to me and they would not change their meaning.

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Answer:

chemical, physical, physical, chemical

Explanation:

both rust and bubbles are products of chemical change whilst freezing ad dissolving are physical.

The first change is a chemical change, the second and the third change is a physical change, and the fourth change is a chemical change.

While a physical change does not result in a new substance, a chemical change does. While experiencing a physical change, a material may change shape or form, but no chemical processes take place, and no new compounds are created. Other signs of chemical and physical alterations also exist.

A chemical change happens when the atoms reorganize themselves to establish new chemical bonds, creating a new molecule (product). Chemical reactions are always a part of chemical changes. The initial components and the finished result differ chemically from one another.

In a physical transformation, no new chemical species is created. Since the identity of the matter does not change, changing a pure substance's state from solid to liquid or gas constitutes a physical change. A physical alteration affects just physical attributes; chemical properties are unaffected. For instance, crystallization, melting, and steel tempering all affect the physical characteristics of materials.

Therefore, the first and fourth is a chemical change and the second and third is a physical changes.

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Answer:

Explanation:

1,2,4,

The equations that show combustion are equations A, B and D.

When we talk about combustion, the idea is that the substance would be burnt in oxygen. In other words, the combustion can be taken to be an oxidation reaction. It is an oxidation reaction in the sense that the oxidation number of the substance that is reacting with the oxygen would become increased.

When we look at the equations that we have, it is quite easy to pick out among the balanced reaction equations that are shown here the ones that has to do with the burning of the substance in oxygen and a consequent rise in the oxidation number.

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Answer:

the answer above is correct

Explanation:

Answer:

a

Explanation:

Answer:

25400 liters

Explanation:

1 cubic meter is 1000 liters

25.4 cubic meter is 25.4×1000 liters= 25400

Answer:

volume

Explanation:

Answer: Volume

Explanation:

Answer:

option (c)2

Explanation:

amino acid have two carbon bond one of the carbon is a part of group is called the carboxy group