Please help lol. Please i don’t wanna fail

Answer:

B. 45kg

Explanation:

3 x 15= 45

Answer:

can u give us the options

Answer:

0.75 atm

Explanation:

To convert from mmHg to atm, divide the value by 760.

570/760=0.7500 atm

Answer:

Option d. 7

Explanation:

A mixture of a strong base and a strong acid produce a neutral salt and water.

This is the reaction of neutralization:

HCl + NaOH → NaCl + H₂O

NaCl →  Na⁺  +  Cl⁻

Sodium chloride is neutral salt which does not give H⁻ neither OH⁻ to medium, that's why pH is neutral.

Both ions are derivated from a strong acid and base so they do not make hydrolisis. They are a conjugate pair of a weak acid and base. The reactions can not occur:

Cl⁻  +  H₂O ← OH⁻  +  HCl

Na⁺  +  H₃O⁺ ← NaOH  + H₂O

Answer:

224.5J

Explanation:

Using the formula as follows:

Q = m × c × ∆T

Where;

Q = amount of heat (J)

m = mass of substance (g)

c = specific heat capacity.

∆T = change in temperature (°C)

According to this question;

m = 20g

∆T = 75°C - 50°C = 25°C

Q = ?

c of iron = 0.449 J/g°C

Using Q = m × c × ∆T

Q = 20 × 0.449 × 25

Q = 224.5J

Answer:

Radical: Symbol: Ion: Monovalent [1] Hypochlorite: ClO: ClO 1-Chlorite: ClO 2: ClO 2 1-Chlorate: ClO 3: ClO 3 1-Perchlorate: ClO 4: ClO 4 1-Hypobromite: BrO: BrO 1-Bromite: BrO 2: BrO 2 1-Bromate: BrO 3: BrO 3 1-Perbromate: BrO 4: BrO 4 1-Hypoiodite: IO: IO 1-Iodite: IO 2: IO 2 1-Iodate: IO 3: IO 3 1-Periodate: IO 4: ...

Answer:

Approximately 4.5 billion years ago, gravity pulled a dense cloud of interstellar gas and dust together to form our solar system.

At the center, gravity pulled more and more material in. Eventually, the pressure in the core was so great that hydrogen atoms began to combine and form helium, releasing a tremendous amount of energy. With that, our Sun was born, and it eventually gathered more than 99 per cent of the available matter.

Matter farther out in the disk was also clumping together. These clumps smashed into one another, forming larger and larger objects. Some of them grew big enough for their gravity to shape them into spheres, becoming planets, dwarf planets and large moons. In other cases, planets did not form because the asteroid belt is made of bits and pieces of the early solar system that could never quite come together into a planet. Other smaller leftover pieces became asteroids, comets, meteoroids, and small, irregular moons.

The statements are related to a postulate of the kinetic molecular theory of gases is gas particles are in constant motion and are very far apart compared to their size. Therefore, option B is correct.

According to kinetic molecular theory, gas particles are in constant motion and have perfectly elastic collisions. Both Charles' and Boyle's laws can be explained using kinetic molecular theory. The average kinetic energy of a gas particle collection is only proportional to absolute temperature.

The kinetic-molecular theory is a theory that explains matter states and is based on the idea that matter is made up of tiny particles that are constantly in motion. The theory contributes to the understanding of observable properties and behaviors of solids, liquids, and gases.

Gas particles are in constant motion and are very far apart in comparison to their size, according to a postulate of the kinetic molecular theory of gases.

Thus, option B is correct.

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Answer:

65.56 M

Explanation:

Using the formula as follows:

C1V1 = C2V2

Where;

C1 = initial concentration (M)

C2 = final concentration (M)

V1 = initial volume (L)

V2 = final volume (L)

According to the information in this question,

C1 = 1,049 M

C2 = ?

V1 = 120 mL

V2 = 1,920 mL

Using C1V1 = C2V2

1049 × 120 = C2 × 1920

125880 = 1920C2

C2 = 125880 ÷ 1920

C2 = 65.56 M

Answer:

3.94

Explanation:

(3.76 + 3.98 + 4.09)/3 = 3.943333333333333...

Answer:

During the electrolysis, hydrogen and chloride ions are removed from solution whereas sodium and hydroxide ions are left behind in solution. This means that sodium hydroxide is also formed during the electrolysis of sodium chloride solution.

Answer:

water....

Explanation:

gradpoint

it is the second one

Answer:

9.82 g of Mg(NO₃)₂

Explanation:

Let's determine the reaction:

2AgNO₃  +  MgBr₂  → Mg(NO₃)₂  +  2AgBr

2 moles of nitrate silver reacts with MgBr₂ in order to produce 1 mol of magnesium nitrate and silver bromide.

We determine the moles of AgNO₃

22.5 g . 1mol / 169.87g = 0.132 moles

Ratio is 2:1.

2 moles of silver nitrate can produce 1 mol of magnesium nitrate

Then, our 0.132 moles may produce (0.132 . 1)/ 2 = 0.0662 moles

We convert moles to mass:

0.0662 mol . 148.3 g/ mol = 9.82 g

Answer:

C) Temperature and Kinetic Energy.

Explanation:

Hello there!

In this case, according to the generic heating curve on the attached file, it possible to see that on the point C, whereas the line is diagonal, the temperature increases, but also the kinetic energy increases because the molecules gain energy due to the increase of the temperature. It is important to say that on flat lines, like those on B and D, the phase change takes place and just the potential energy change.

In such a way, we infer that the answer is C) Temperature and Kinetic Energy.

Best regards!

Answer:

C) Temperature and Kinetic Energy.

Explanation:

In the heating curve of an unknown substance, the line labeled C represents Temperature and Kinetic Energy.

Answer: The partial pressure of Ne is 9.02 atm.

Explanation:

Given: Total pressure = 14.9 atm

Partial pressure of He = 1.43 atm

Partial pressure of Ar = 4.45 atm

Partial pressure of Ne = ?

According to the Dalton's law of partial pressures the total pressure exerted by the a number of gases in a mixture is equal to the sum of partial pressures of each gas present in the mixture.

Now, for the given mixture the partial pressure of Ne is as follows.

Total pressure = Partial pressure of He + Partial pressure of Ar + Partial pressure of Ne

Substitute the values into above formula as follows.

Total pressure = Partial pressure of He + Partial pressure of Ar + Partial pressure of Ne

14.9 atm = 1.43 atm + 4.45 atm + Partial pressure of Ne

Partial pressure of Ne = 14.9 atm - 5.88 atm

= 9.02 atm

Thus, we can conclude that the partial pressure of Ne is 9.02 atm.

Answer:

B. 0.55 M

Explanation:

Step 1: Given data

Step 2: Calculate the molarity of the aqueous solution

The molarity is a way to express the concentration of a solution. It is equal to the quotient between the moles of solute and the liters of solution.

M = moles of solute / liters of solution

M = 1.5 mol / 2.75 L = 0.55 mol/L = 0.55 M

Answer:=33.8 psi

Explanation:

Answer:

33.8007 (i think)

Explanation:

Answer:

La palabra bicarbonato es un término químico para referirse a una sal ácida del ácido carbónico en combinación con un metal. ... Pero si sólo está sustituido un átomo de hidrógeno por el metal, entonces obtenemos un bicarbonato o carbonato ácido, por ejemplo, bicarbonato sódico: CO3H Na.

Answer:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.

Explanation:

In comparison to other toxic industrial waste, nuclear waste is neither exceptionally dangerous nor difficult to manage. It is technically possible to dispose of high-level radioactive waste safely. The toxic life of nuclear waste is 10,000 years. The correct option is B.

Waste is no longer dangerous if radioactive material has adequately decomposed. However, it will take the radioactive material between a few hours and hundreds of millions of years to decay.

Breeder reactors produce plutonium-239, which has a half-life of 24,400 years and is exceedingly hazardous in even minute amounts. Cesium-137 and strontium-190 are low-level radioactive wastes from typical nuclear power facilities.

Thus the correct option is B.

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Answer:

These atoms belong to the same element (sulfur, atomic number [tex]16[/tex].) Hence, the atomic number of each atom would be equal to the atomic number of sulfur: [tex]16\![/tex].

Each of these isotopes contains a different number of neutrons. Hence, the mass number (number of neutrons and protons in the atom) differ.

Explanation:

The atomic number of an atom is the number of protons in the atom.

The mass number of an atom is the number of protons in this atom, plus the number of neutrons in this atom.

The exact element (e.g., sulfur) that an atom belongs to depends on the atomic number of that atom. For example, an atom with atomic number [tex]16[/tex] belongs to sulfur, while an atom with atomic number [tex]18[/tex] belongs to argon.

All four types of atoms in this sample belongs to the element sulfur. The atomic number of sulfur is [tex]16[/tex]. Hence, the atomic number of all four types of atoms must also be [tex]16\![/tex]. Otherwise, these atoms would belong to other elements and won't be named after "sulfur".

Hence, all atoms in this sample would have the same atomic number: [tex]16[/tex]. Each of these atoms would contain [tex]16\![/tex] protons.

While the number of protons in each of these atoms is fixed, the number of neutrons in each of these atoms could still vary. Because the mass number of an atom accounts for both protons and neutrons, the mass number of these atoms would not be the same.

For example, sulfur-[tex]32[/tex] (mass number [tex]32\![/tex]) contains [tex]32 - 16 = 16[/tex] neutrons, whereas sulfur-[tex]33[/tex] (mass number [tex]33\![/tex]) contains [tex]33 - 16 = 17[/tex] neutrons. (The [tex]16[/tex] in the left-hand side is the number of protons in each of these atoms.) Hence, these types of atoms have different mass numbers even though they share the same proton number.

Answer:

the number of moles is 0.279

Explanation:

The computation of the number of moles of calcium nitrate, is shown below;

We know that

Number of moles = mass of substance ÷ molecular weight

= 45.8 g ÷ 164.088

= 0.279moles

hence, the number of moles is 0.279

We simply applied the above formula so that the correct value could come

Answer:

The correct answer is A, Humid Subtropical

Explanation:

Humid Subtropical's climate is wet, warm, and located on the edges of tropics.

Answer:

2.6 L CO2 at STP

Explanation:

sorry if its wrong!

Answer:

0.5 M has the weakest concentration.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to remember that the concentration, or molarity, of a solution is given in terms of moles per liters of solution.

In such a way, we can infer that the solution with the weakest concentration is the one with the smallest molarity, that is 0.5 M.

Best regards!

Answer:

For the reaction CH3COOH→CH3COO– + H+

Among the given statements which is the correct statement?

CH3COOH is a Brønsted-Lowry base.

CH3COO– is an Arrhenius base.

CH3COOH is a Brønsted-Lowry acid.

CH3COO– is a Lewis base.

Explanation:

Bronsted acid is the proton donor.

Bronsted base is the proton acceptor.

Arrhenius base is the one that releases OH- ions when dissolved in water.

Lewis base is the one that is an electron-pair donor.

In the given reaction,

CH3COOH→CH3COO– + H+

Acetic acid releases a proton.

So, it is a proton donor.

Hence, It is a Bronsted-Lowry acid.

Third option is the correct answer.

Answer:

ionic

Explanation:

I don't know if this correct

Answer:

He was the first scientist to observe and describe bacteria and protozoa by looking at a drop of water from a pound under a microscope. He also was the one to build the first compound microscope.

Hope this helps :)