Question 1 (1 point)
How is atomic mass calculated?
O a
Ob
Oc
Od
Since the atomic mass is calculated as the sum of protons and neutrons, it is measured in amu. This is because protons and
neutrons each have a mass of 1 amu.
Since the atomic mass is calculated as the sum of neutrons, it is measured in amu. This is because neutrons have a mass of 1
amu.
Since the atomic mass is calculated as the sum of protons, it is measured in amu. This is because protons have a mass of 1
amu.
Since the atomic mass is calculated as the sum of protons and electrons, it is measured in amu. This is because protons and
electrons each have a mass of 1 amu.

Answer:

D: but see below.

Explanation:

There are two main disadvantages to a pneumatic  system

1. They require a compressor of some sort.

2. They can be slow to respond.

That makes car brakes the choice of engineers to be the hydraulic system a far superior choice for automobiles.

A car usually has to stop quickly and efficiently.

A: hydraulic systems generally do not provide a cushioning effect. I would say A is not what you want.

C. Hydraulic systems are quick to respond. The answer is not C

D. Work well at all Temperature ranges. They better do this. A few days ago the outside temperature where I live reached - 40. The summer can reach plus 30 C. That's a range of 70 degrees. They better work over this range.

Unfortunately B is also true. I think you are intended to pick B, but D is also true. Perhaps the    question means a greater range than 70 degrees. If that is so, B is really your better answer.

It is not possible to make a standardized solution of sodium hydroxide by directly determining the mass of solid sodium hydroxide because sodium hydroxide is hygroscopic, which means it readily absorbs moisture from the air. This property makes it difficult to accurately determine the exact mass of pure sodium hydroxide without it being contaminated by water.

When sodium hydroxide comes into contact with moisture, it undergoes a chemical reaction called hydrolysis, where it reacts with water to form sodium hydroxide solution. This reaction can occur even at normal atmospheric conditions, leading to the formation of a solution with a different concentration than the one intended.

To create a standardized solution, it is necessary to precisely measure the amount of sodium hydroxide and water separately, ensuring that the exact amount of solute (sodium hydroxide) is dissolved in the exact amount of solvent (water). This allows for accurate determination of the concentration of the resulting solution.

However, if you do have solid sodium hydroxide and need to make a standardized solution, you can still do so by employing indirect methods.

One common approach is to use a primary standard, such as an acid of known concentration (e.g., hydrochloric acid), to titrate against the sodium hydroxide solution. By measuring the amount of acid required to neutralize the sodium hydroxide, you can calculate the concentration of the sodium hydroxide solution.

Overall, the hygroscopic nature of sodium hydroxide makes it challenging to directly determine the mass of solid sodium hydroxide accurately, necessitating alternative methods for preparing standardized solutions.

To know more about hygroscopic, refer to the link :

https://brainly.com/question/13545535#

#SPJ11

Answer:

It is 823.5

Explanation:

your welcome

Answer:

\(6.05211\times 10^{23}\ \text{atoms}\)

Explanation:

Moles of carbon dioxide = 1.005 moles

\(N_A\) = Avogadro's number = \(6.022\times 10^{23}\ \text{mol}^{-1}\)

Number of atoms is given by

\(\text{Moles}\times N_A=1.005\times 6.022\times 10^{23}\)

\(=6.05211\times 10^{23}\ \text{atoms}\)

The number of atoms in the given amount of moles of carbon dioxide is \(6.05211\times 10^{23}\ \text{atoms}\).

The balance chemical reaction is as below:

4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)

The term balanced chemical equation is defined when the number of the atoms involved in the reactants side is exactly equal to the number of atoms in the products side.

The most important thing about balancing chemical equations is to satisfy the law of conservation of mass, This states that  “the total mass of the products is exactly equal to the total mass of all the reactants”

Thus, The balance chemical reaction is as below:

4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)

To learn more about balance chemical reaction, follow the link;

https://brainly.com/question/30230799

#SPJ1

The pH of the solution is 3.059.

To calculate the pH of this solution, we need to use the Henderson-Hasselbalch equation, which relates the pH of a buffer solution to the pKa of the weak acid and the ratio of concentrations of  weak acid and its conjugate base.

First, we need to calculate the concentration of the weak acid and its conjugate base in the solution after the sodium acetate is dissolved.

We know that 1.00 g of sodium acetate is dissolved in 74.5 mL of 0.20 M acetic acid solution. We can use the molar mass of sodium acetate to convert the mass to moles:

1.00 g CH₃COONa × (1 mol CH₃COONa / 82.03 g CH₃COONa) = 0.01219 mol CH₃COONa

Since sodium acetate is a strong electrolyte, it will completely dissociate in water to form sodium ions (Na⁺) and acetate ions (CH₃COO⁻). The acetate ions will react with the acetic acid in the solution to form more acetate ions and hydronium ions (H₃O⁺), which will decrease the pH of the solution.

We can use the stoichiometry of this reaction to calculate the concentration of acetate ions and hydronium ions in the solution:

CH₃COO⁻ + H₃O+ ↔ CH₃COOH + H₂O

Since we started with 0.20 M acetic acid, the initial concentration of hydronium ions is also 0.20 M. Let's call the concentration of acetate ions x. Then, the concentration of acetic acid will be (0.20 - x) M, and the equilibrium constant for this reaction (Ka) is:

Ka = [CH₃COOH][H₂O] / [CH₃COO⁻][H₃O⁺]

Substituting in the known values:

1.75 × 10⁻⁵ = (0.20 - x)(1) / (x)(0.20)

Solving for x:

x = 1.05 × 10⁻³ M

So the concentration of acetate ions is 1.05 × 10⁻³ M, and the concentration of acetic acid is (0.20 - 1.05 × 10⁻³) M.

Now we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

where pKa is the negative logarithm of the acid dissociation constant (Ka) for acetic acid (pKa = -log(1.75 × 10⁻⁵) = 4.756), [A-] is the concentration of acetate ions (1.05 × 10⁻³ M), and [HA] is the concentration of acetic acid (0.199 M).

Plugging in the values:

pH = 4.756 + log(1.05 × 10⁻³ / 0.199)

pH = 4.756 + (-1.697)

pH = 3.059

To know more about Henderson-Hasselbalch equation here

https://brainly.com/question/13423434

#SPJ4

\(HCLO_{2}\) is the strongest acid.

Based on the oxidation state of the central atom, the acidity is determined.

More acidic nature is present at higher oxidation states.

It is +3 in \(HCLO_{2}\)

It is +1 in HClO and +1 in HBrO

Chloric acid, hydrobromic acid, hydrochloric acid, hydroiodic acid, nitric acid, perchloric acid, and sulfuric acid are the seven major acids that make up strong acids.

These are referred to as strong acids since they can totally dissociate in water.

An acid that entirely ionizes in an aqueous solution is referred to as a strong acid.

When an acid is dissolved in water, it always loses a proton (A H+). In other words, a strong acid is highly effective in releasing protons and constantly on the move. An acid that partially ionizes in a solution is considered weak.

learn more about strongest acid here

https://brainly.com/question/16616073

#SPJ4

x = √(6.5×10^(-5) × 0.120) ≈ 2.76×10^(-3) M

pH = -log(2.76×10^(-3)) ≈ 2.56

1. To determine the [H3O+] of a 0.120 M solution of benzoic acid, we can use the Ka expression: Ka = [H3O+][A-]/[HA]. Since Ka = 6.5×10^(-5), let x represent [H3O+] and [A-], then the equation becomes:

6.5×10^(-5) = x^2/(0.120-x)

Approximating by assuming x is small compared to 0.120, we can simplify the equation to:

6.5×10^(-5) ≈ x^2/0.120

Solving for x (H3O+ concentration):
x = √(6.5×10^(-5) × 0.120) ≈ 2.76×10^(-3) M

2. To determine the pH of this solution of benzoic acid, use the formula:

pH = -log[H3O+]

pH = -log(2.76×10^(-3)) ≈ 2.56

To learn more about benzoic acid, refer below:

https://brainly.com/question/24052816

#SPJ11

The values for the density should have 3 significant digits. Therefore, the density should be reported as 8.96 g/mL, with 3 significant digits.

To determine the number of significant digits in the density calculation, we need to look at the number of significant digits in the original measurements. The mass measurement has 4 significant digits (32.465 g), and the volume measurement has 3 significant digits (3.62 mL).

When we divide the mass by the volume to calculate density, we end up with:

density = mass / volume
density = 32.465 g / 3.62 mL
density = 8.961991 g/mL

Since we can only report as many significant digits as the least precise measurement, we need to round our answer to 3 significant digits (the number of significant digits in the volume measurement).

Therefore, the density should be reported as 8.96 g/mL, with 3 significant digits.

Visit here to learn more about  density : https://brainly.com/question/29775886
#SPJ11

Answer:

The answer is C2H4O2

According to the rule of conservation of mass, the total mass of the reactants and products in a chemical reaction must be equal.

Mass is a physical body's total amount of matter. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The intensity of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram is the primary mass unit in the SI.

The combined mass of all the components involved in a chemical process stays constant. Additionally, the quantity of atoms in a reaction doesn't change. Chemical reactions cannot produce or destroy mass.

Thus, the total mass of the reactants and products in a chemical reaction must be equal.

To learn more about mass, follow the link;

https://brainly.com/question/19694949

#SPJ1

Considering the Charles' law, the gas would have a temperature of -109.2 C.

Finally, Charles' law establishes the relationship between the volume and temperature of a gas sample at constant pressure. This law says that the volume is directly proportional to the temperature of the gas. That is, if the temperature increases, the volume of the gas increases, while if the temperature of the gas decreases, the volume decreases.

Charles' law is expressed mathematically as:

\(\frac{V}{T} =k\)

If you want to study two different states, an initial state 1 and a final state 2, the following is true:

\(\frac{V1}{T1} =\frac{V2}{T2}\)

In this case, you know:

You can see that the pressure remains constant, so you can apply Charles's law.

Replacing in the Charles's law:

\(\frac{10 L}{293 K} =\frac{6 L}{T2}\)

Solving:

\(\frac{10 L}{293 K} T2=6 L\)

\(T2=\frac{6 L}{\frac{10 L}{293 K} }\)

T2=163.8 K= -109.2 C

The gas would have a temperature of -109.2 C.

Learn more about Charles's law:

https://brainly.com/question/4147359?referrer=searchResults

The molality of the solution is 8.22 m.

We have to note that the molality has to do with the ratio of the amount of the substance that have been dissolved to the mass of the solution in kilograms and it is one of units of concentration that we have.

Mass of the acetone = Density * volume

=  270.0 ml * 0.7857 g/ml

= 212 g

Number of moles of the acetone = 212 g/58 g/mol

= 3.7 moles

The molality now is; Number of moles/ Mass of the solution

=  3.7 moles/450 * 10^-3 Kg

= 8.22 m

Learn more about molality:https://brainly.com/question/26921570

#SPJ1

Answer:

No, an oxygen atom cannot contain more than 8 protons.

Explanation:

An oxygen atom is described as an atom with 8 protons found in the nucleus (atom weight of 16).

If hypothetically, an oxygen atom contained 9 protons, it would no longer be considered an "oxygen" atom. Once an oxygen atom has 9 protons it is considered a "fluorine" atom.

After 2.56 billion years, approximately 100,000 atoms of potassium-40 would remain.

To calculate the number of remaining atoms of potassium-40 after a given time, we can use the concept of half-life. The half-life of potassium-40 is 1.28 billion years, which means that every 1.28 billion years, half of the atoms will decay.

In this case, 2.56 billion years is exactly twice the half-life of potassium-40. Therefore, after 2.56 billion years, two half-lives have passed. Each half-life reduces the initial number of atoms by half.

Starting with 400,000 atoms, after the first half-life (1.28 billion years), the number of atoms remaining would be 200,000. After the second half-life (another 1.28 billion years), the remaining number would be reduced to 100,000 atoms.

So, after 2.56 billion years, approximately 100,000 atoms of potassium-40 would remain.

To know more about atoms , refer here:

https://brainly.com/question/1566330#

#SPJ11

Answer: Its true, mental ions and hydrogen ion both have the same type of charge.

Answer:

TRUE, Metal ions, and hydrogen ions both have the same type of charge. Explanation: Metal atoms lose one or more electrons at their maximum energy level and improve positively charged ions. A hydrogen ion is created when a hydrogen atom loses electrons and then becomes positively charged (charge +1).

Answer:

359

i think

Explanation:

An individual breathes in about 10.94 cubic meters of air at STP in one day.

What is respiration ?

Respiration is the process by which living organisms, including humans, exchange gases with their environment. In the case of humans, respiration refers specifically to the process of exchanging oxygen and carbon dioxide between the lungs and the bloodstream.

Respiration consists of two main stages:

External respiration: It occurs in the lungs where oxygen from the air is exchanged for carbon dioxide in the blood.

Internal respiration: It occurs in the body's tissues where oxygen is released from the blood and carbon dioxide is taken up by the blood.

To calculate the volume of air breathed in one day at STP (Standard Temperature and Pressure), we can use the following formula:

V = (breathing rate) x (volume of air per breath) x (time per day)

Where:

breathing rate = 15 breaths per minute

volume of air per breath = 505 cm^3 = 0.000505 m^3 (converted from cubic centimeters to cubic meters)

time per day = 24 hours x 60 minutes per hour = 1440 minutes

Plugging in these values, we get:

V = 15 breaths/min x 0.000505 m^3/breath x 1440 min/day

V = 10.9356 m^3/day

Therefore, an individual breathes in about 10.94 cubic meters of air at STP in one day.

To know more about Respiratory system visit:-

https://brainly.com/question/24653210

#SPJ1

a. After sequence of instructions (mov al, 0D4h; shr al, 1), value of AL is 6Ah. b. After sequence of instructions (mov al, 0D4h; sar al, 1), value of AL is EAh. c. After sequence of (mov al, 004h; sar al, 4), value of AL is 000h. d. After sequence of instructions (mov al, 004h; rol al, 1), value of AL is A9h.

Let's go through each instruction and show the value of AL after each shift or rotate instruction has executed: a. mov al, 0D4h AL = 0D4h shr al, 1 Right shift (shr) divides the value by 2, discarding the least significant bit and shifting all other bits to right.

AL after shr = 6Ah b. mov al, 0D4h AL = 0D4h sar al, 1 Arithmetic right shift (sar) preserves the sign bit (the most significant bit) and shifts all bits to the right.

AL after sar = EAh c. mov al, 004h AL = 004h sar al, 4 AL after sar = 000h Note: Since the original value of AL is 004h (which is 4 in decimal), after shifting all bits to the right by 4 positions, the resulting value is 000h (which is 0 in decimal).

d. mov al, 004h AL = 004h rol al, 1 Left rotate (rol) shifts all bits to the left by 1 position, and the bit that gets shifted out from the most significant end is rotated back to the least significant end. AL after rol = A9h

Know more about bit here:

https://brainly.com/question/31991040

#SPJ11

The paired t-test yields a different conclusion than the normal t-test because it accounts for the paired nature of the data, comparing the measurements taken at the top and bottom of the lake separately.

In this scenario, the paired t-test is appropriate because it analyzes the data as pairs, considering the chloride levels measured at the top and bottom of the lake for each sample. By comparing the differences within each pair, the paired t-test determines whether there is a significant difference between the chloride levels at the top and bottom of the lake.

Using the paired t-test, the differences between the paired observations are calculated, and the null hypothesis assumes that the mean difference is zero (no significant difference between the top and bottom chloride levels). The test then determines whether the observed differences are statistically significant at a chosen confidence level, in this case, 95%.

The normal t-test for differences in means, on the other hand, would treat the top and bottom chloride levels as separate and unrelated groups, disregarding their paired nature. By pooling the data and conducting a standard t-test, the analysis assumes that the two sets of measurements are independent, which may not be appropriate in this case. This can lead to a different conclusion compared to the paired t-test.

The different conclusion drawn from using the paired t-test compared to pooling the data and using the normal t-test is due to the consideration of the paired nature of the measurements. The paired t-test takes into account the potential correlation or connection between the measurements taken at the same location (top and bottom of the lake) and assesses the differences within each pair.

Pooling the data and using the normal t-test treats the measurements as independent, disregarding the pairing. This can result in a loss of valuable information and may lead to an inaccurate conclusion. The paired t-test is more appropriate when dealing with dependent or related measurements, ensuring a more accurate assessment of the differences between the top and bottom chloride levels.

Learn more about paired t-test

brainly.com/question/32245864

#SPJ11

Answer:

When you are exercising, your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.

Explanation:

Explanation:

byju's ig. Cause it gives a proper concept

Answer:

copper

Explanation:

coal, petroleum, and natural gas are all related to fossil fuels.

Copper is not a fossil fuel and the correct option is option 1.

Fossil fuels are compound mixtures made of fossilized plant and animal remnants from millions of years ago. The creation of fossil fuels—either oil, natural gas, or coal—from these fossils is determined by the type of fossil, the amount of heat, and the amount of pressure.

Fossil fuels are a non-renewable source of energy. Most of the energy used by us is obtained by the burning of fossil fuels. These fossil fuels are used up at a faster rate. They cannot be regrown at a scale compared to their consumption.

Therefore, Copper is not a fossil fuel and the correct option is option 1.

Learn more about Fossil fuels, here:

https://brainly.com/question/3371055

#SPJ2

To solve the problem, we can use the combined gas law, which relates pressure, volume, and temperature of gases. We can plug in the given pressures and temperatures and solve for the overall pressure inside the balloon.

The situation described can be solved using the combined gas law, which states:

(P1 x V1) / (T1) = (P2 x V2) / (T2)

Where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, respectively. P2, V2, and T2 are the final pressure, volume, and temperature of the gas, respectively.

To solve for the final temperature (T2), we can rearrange the equation as:

T2 = (P2 x V2 x T1) / (P1 x V1)

Let's plug in the given values:

P1 = 700 mm

P2 = 800 mm

V1 = V2 (since the volume is doubled)

T1 = 0°C + 273.15 = 273.15 K (converting to Kelvin)

So, we have:

T2 = (800 mm x 2V1 x 273.15 K) / (700 mm x V1)

T2 = (1600/7) x 273.15 K

T2 = 392.2 K

Therefore, the final temperature at which the volume of gas would be doubled, if the pressure increases from 700-800 mm and the gas is initially at 0°C, is approximately 392.2 Kelvin (which is approximately 119°C or 246°F).

Answer:

c.

Explanation:

Gravitational potential energy will rises

119.37 g/mol

Relative atomic mass (Ar) and relative molecular mass / molar mass (M)  

the molar mass/molecular mass of a compound : the sum of the relative atomic mass (Ar) of the constituent atoms

M AxBy = (x.Ar A + y. Ar B)  

Atomic weight (Ar) of :

The molar mass of CHCl₃

\(\tt CHCl_3=12.0107+1,00784+(35,453\times 3)=119.37~g/mol\)

The molar mass of \(CHCl_3\) (chloroform) is 119.37 g/mol. Therefore, the correct option is C.

The organic compound chloroform, which has the molecular formula \(CHCl_3\), is well known for its use as a solvent and anaesthetic. It consists of three chlorine atoms (Cl), one hydrogen atom (H), and one carbon atom (C).

The molar mass of carbon (C) is approximately 12.01 g/mol, the molar mass of hydrogen (H) is approximately 1.01 g/mol, and the molar mass of chlorine (Cl) is approximately 35.45 g/mol. We add up the molar masses of all the individual atoms to determine the molar mass of \(CHCl_3\):

(1 * molar mass of C) + (1 * molar mass of H) + (3 * molar mass of Cl)

(1 * 12.01 g/mol) + (1 * 1.01 g/mol) + (3 * 35.45 g/mol)

12.01 g/mol + 1.01 g/mol + 106.35 g/mol

The molar mass of \(CHCl_3\) is approximately 119.37 g/mol.

Therefore, the correct answer is C.

Learn more about Molar mass, here:

https://brainly.com/question/31545539

#SPJ6

From the standard curve, the absorbance of the 2.0 mg/mL solution is 0.171, which can be expressed as A = εbc, where ε is the molar absorptivity (liters per mole per centimeter) at 230 nm, b is the path length (cm), and c is the concentration of benzoic acid (moles per liter).

The molar absorptivity (ε) can be calculated as:ε = A/bc = 0.171/(1 × 2.0 × 10^-3) = 85.5 L mol^-1 cm^-1

Using Beer-Lambert's law, the concentration of benzoic acid in the sample can be calculated as:c = A/εb = 0.065/85.5 × 1 × 10^-2 = 7.60 × 10^-5 mol/L

The concentration of benzoic acid in the sample is 7.60 × 10^-5 mol/L. The mass of benzoic acid in the sample can be calculated as:

mass = concentration × volume × molar mass= 7.60 × 10^-5 × 100 × 10^-3 × 122.12= 0.93 mg

Concentration of caffeine:

From the standard curve, the absorbance of the 10.0 mg/mL solution is 0.980, which can be expressed as A = εbc, where ε is the molar absorptivity (liters per mole per centimeter) at 265 nm, b is the path length (cm), and c is the concentration of caffeine (moles per liter).

The molar absorptivity (ε) can be calculated as:ε = A/bc = 0.980/(1 × 10.0 × 10^-3) = 98 L mol^-1 cm^-1

Using Beer-Lambert's law, the concentration of caffeine in the sample can be calculated as:c = A/εb = 0.326/98 × 1 × 10^-2 = 3.33 × 10^-4 mol/LThe concentration of caffeine in the sample is 3.33 × 10^-4 mol/L.

The mass of caffeine in the sample can be calculated as:mass = concentration × volume × molar mass= 3.33 × 10^-4 × 100 × 10^-3 × 194.19= 6.47 mg

The mass of caffeine in the sample is 6.47 mg.

Learn more about molar absorptivity of at

https://brainly.com/question/32116893

#SPJ11

The chemiluminescence reaction should be conducted in a dark environment, at a specific temperature and pH, and in the presence of a suitable oxidizing agent in order to produce a successful reaction.

Chemiluminescence is a process that involves the emission of light from a chemical reaction. This type of reaction requires a specific environment in order to occur successfully.

First and foremost, the chemiluminescence reaction must be conducted in the absence of light. This is because the emission of light from the reaction can be easily masked by ambient light, making it difficult to detect. Therefore, a dark environment such as a darkroom or a light-tight box is typically used to perform chemiluminescence reactions.

Additionally, the chemiluminescence reaction requires specific temperature and pH conditions in order to occur. These conditions can vary depending on the specific reaction being performed, but generally, the reaction takes place at a low temperature (around room temperature) and at a slightly basic pH.

Finally, the reaction must be conducted in the presence of a suitable oxidizing agent, which is responsible for initiating the chemiluminescence process. Common oxidizing agents used in chemiluminescence reactions include hydrogen peroxide and luminol.

To learn more about chemiluminescence

https://brainly.com/question/6089623

#SPJ4