I need help with this, I need to know what they mean cause I don’t understand it.

Chemical equations must be balanced, which requires that the quantity and type of atoms on both sides of the reaction arrow be equal.

Sulphur trioxide = SO_3

Sulfuric acid = H_2SO_4

SO 3(g) + H2O (l)   ---> H2SO4 (aq)

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Hence, the probability that the mean cholesterol level of the sample will be greater than 217 is 0.034. Answer: 0.034.According to the given statement, we have the following data.

mean (μ) = 205 mg/dLstandard deviation

(σ) = 35 mg/dLsample size

(n) = 46(a) Probability that the mean cholesterol level of the sample will be no more than 205.To find this, we will use the z-score formula.z

= (x - μ) / (σ/√n)Here,

x = 205

μ = 205

σ =

35n

= 46Plugging in these values, we get,

z = (205 - 205) / (35/√46)

z = 0Hence, the probability that the mean cholesterol level of the sample will be no more than 205 is 0.5. Answer: 0.5

(b) Probability that the mean cholesterol level of the sample will be between 200 and 210:

To find this, we need to standardize the values and use the z-table.P(z < (210 - 205) / (35/√46)) - P(z < (200 - 205) / (35/√46))P(z < 1.65) - P(z < -1.65) = 0.4495 - 0.0505

= 0.3990Hence, the probability that the mean cholesterol level of the sample will be between 200 and 210 is 0.3990. Answer: 0.3990

(c) Probability that the mean cholesterol level of the sample will be less than 195: To find this, we need to standardize the values and use the z-table.P(z < (195 - 205) / (35/√46))P(z < -2.91) = 0.002Hence, the probability that the mean cholesterol level of the sample will be less than 195 is 0.002. Answer: 0.002

(d) Probability that the mean cholesterol level of the sample will be greater than 217: To find this, we need to standardize the values and use the z-table.P(z > (217 - 205) / (35/√46))P(z > 1.82) = 0.034 Answer: 0.034.

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Answer: take it

Explanation:

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

f is the force

m is the mass

From the question we have

\(a = \frac{5}{0.25} \\ \)

We have the final answer as

Hope this helps you

Dissolve NaOH into the Solution will - Increased E

Increase the temperature - Increased E

Increase the amount of \(PbCl_{2}\) - No change in E

Dilute the solution by adding \(H_{2}O\) - Increased E              

E= Voltage or the electromotive force generated in the cell

Dissolving NaOH will increase the conductivity and number of ions in the cell and Increases E .  Adding water also increases the presence of hydrogen and hydroxide ions in the solution and Increases E.

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Answer:

defined the objective of the lab, showing critical thinking skills.

Answer:

1st question: The moon is closer to Earth so it is easier to see and visit.

2nd question: The moon has a week/month cycle instead of a day/night cycle.

3rd question: The corona

Explanation:

The first step of the reaction, we have  reaction between a nucleophile and an electrophile.

We can see that in the first step of the reaction, we have  reaction between a nucleophile and an electrophile. In this case, the electrophile would have to be an alkyl halide which produces a carbocation as show in the image attached. What we have here is quite similar or  like most of the organic reactions, this reaction occurs in a number of detailed or smaller steps and each step of the reaction is going to help to bring us closer to the end product of the entire steps of the reaction which is wat we target as we carry out the particular reaction.The second step involves the reduction of the alkyne with the use of a Lindlar catalyst. As such the reaction is poisoned and it stops at the alkyne stage rather than going on to obtain the alkane.

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2.2 x 10^-2

0.055 / 250 = 0.00022 - This would be 2.2 x 10^-4, but the question is asking for percent, not proportion, so multiply by 100% to get the percentage.

0.00022 * 100% = 0.022% = 2.2 * 10^-2

The product nucleus in this case is Zirconium-85 (Zr-85), which has a mass number of 85 and 40 protons and 45 neutrons. Zirconium is a chemical element that is commonly used in nuclear reactors due to its ability to absorb neutrons.

In positron decay, an unstable nucleus emits a positron, which is a positively charged electron. This process occurs when the number of protons in the nucleus is greater than the number of neutrons, causing the nucleus to be unstable.
Yttrium-85 (Y-85) has a mass number of 85, meaning it has 39 protons and 46 neutrons. When Y-85 undergoes positron decay, one of its protons turns into a neutron and emits a positron. This results in a new nucleus with one less proton and one more neutron.
In summary, Y-85 undergoing positron decay results in the formation of Zr-85 as the product nucleus. This process is important in nuclear physics and has practical applications in fields such as medicine and energy production.

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The correct order of increasing negative charge on carbon atom is :

CH₃F < CH₃OH < CH₃NH₂ < CH₃CH₃ < CH₃MgBr < CH₃Li

when the electronegativity of the element increases the positive charge on carbon will increases and negative charge on the carbon atom will decreases.    

Electronegativity   ∝  (+ charge on carbon)

Electronegativity    ∝   1 / (- charge on carbon)

Electronegativity is defined as tendency of an atom or group to attract electrons towards itself. higher the electronegativity of an atom , the more strongly that elements attract the electron towards itself. as the proton increases the electronegativity or attraction increases.        

according to electronegativity the following  order of increasing negative charge on carbon as follows:

 CH₃F < CH₃OH < CH₃NH₂ < CH₃CH₃ < CH₃MgBr < CH₃Li

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The correct answer is D. ionic, polar covalent, nonpolar covalent.

Ionic bonds have the largest electronegativity difference between atoms, followed by polar covalent bonds, and then nonpolar covalent bonds, which have the smallest electronegativity difference.

Ionic bonds occur when one atom transfers electrons to another atom, resulting in the formation of oppositely charged ions that are attracted to each other. This typically happens between atoms with very different electronegativities.

Polar covalent bonds occur when two atoms share electrons, but the electrons are not shared equally because one atom is more electronegative than the other. This results in a partial positive charge on one atom and a partial negative charge on the other.

Nonpolar covalent bonds occur when two atoms share electrons equally because they have the same or similar electronegativities.

It's important to note that the distinction between these bond types is not always clear-cut, and there can be some overlap between them.

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When it comes to chemical formulas, the chemical formula is used to show the elements that make up a compound. For instance, water has the chemical formula H2O, which shows that it is made up of two hydrogen atoms and one oxygen atom.

Hydrogen ion (H+) has the chemical formula H+

Hydroxide ion (OH-) has the chemical formula OH-

Hydronium ion (H3O+) has the chemical formula H3O+.

The chemical formulas of hydrogen ion, hydroxide ion, and hydronium ion are:

H+ for hydrogen ion OH- for hydroxide ionH3O+ for hydronium ion.

An ion is an atom or a molecule that has gained or lost electrons. These atoms or molecules become charged ions due to their gain or loss of electrons. Hydrogen ion, hydroxide ion, and hydronium ion are three of the most common ions in aqueous solution that have a significant impact on chemical reactions. The hydrogen ion, which has a positive charge, is an essential component of many chemical reactions, particularly those that take place in water. It is represented by the chemical symbol H+. The hydroxide ion, which has a negative charge, is also a crucial component of many chemical reactions, particularly those that take place in water. It is represented by the chemical symbol OH-.The hydronium ion, which has a positive charge, is another important component of many chemical reactions, particularly those that take place in aqueous solutions. It is represented by the chemical symbol H3O+.

In summary, hydrogen ion, hydroxide ion, and hydronium ion are important components of many chemical reactions. They have different chemical formulas, with hydrogen ion being represented by H+, hydroxide ion by OH-, and hydronium ion by H3O+.

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Answer: Emily can measure the density of the piece of metal to find out what it is. Density is a physical property.

Explanation:

The density of a substance can be found by dividing its mass by its volume. No chemical reaction is involved in measuring the mass nor the volume; therefore, density is a physical property.

Correct option is c. 0

Let's discuss it further below.

In the Lewis structure for formaldehyde (H2CO), where C is the central atom, the formal charge on C is:

Step 1: Determine the number of valence electrons for C. Carbon has 4 valence electrons.
Step 2: Calculate the number of electrons assigned to C in the Lewis structure. In formaldehyde, C is bonded to 2 H atoms (each with 1 bond) and 1 O atom (with a double bond). This gives C a total of 4 bonds, so it has 4 assigned electrons.
Step 3: Calculate the formal charge on C using the formula: Formal Charge = (Valence Electrons) - (Assigned Electrons). Thus, Formal Charge on C = (4) - (4) = 0.

So, the formal charge on C in the Lewis structure for formaldehyde is 0 (option c).

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Explanation:

cooked rice

nutrient

carbohydrate.

Boiler eggs

nutrient

Protein.

Answer:

Acidic                       Neutral                      Basic

apple juice : 3      chocolate milk : 7      hand soap : 10

mouthwash : 5                                          tap water : 8

shampoo : 6

Explanation:

correct on edge 2021

Acidic                                        

apple juice : 3      

mouthwash : 5                                          

shampoo : 6

Neutral          

chocolate milk : 7  

Basic

hand soap : 10

tap water : 8

In chemistry, something that's acidic has a low pH, as opposed to a base, which has a higher pH. Various kinds of acids and vinegar are also acidic. The word comes from acid, which originally meant "of the taste of vinegar," from the Latin word acidus, "sour or sharp."

Not taking part or giving assistance in a dispute or war between others.

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Answer:

0.194L

Explanation:

Molarity of a solution is its molar concentration, and can be calculated using the formula:

Molarity = no. of moles (n) ÷ volume (V)

According to this question, the molar concentration/molarity of a solution of copper sulfate (CuSO4) is 2.11mol/L and contains 0.41 mol CuSO4. The volume can be calculated as follows;

Volume = no. of moles ÷ molarity

Volume = 0.41mol ÷ 2.11mol/L

V = 0.194 liter

Answer:

A. Electronegativity increases up and to the right.

Explanation:

edge 2021

Electronegativity increases up and to the right. Hence, option A is correct.

The periodic table is a tabular arrangement of the chemical elements organized with an increasing atomic number.

Electronegativity is a chemical property that explains the trend of an atom to attract a shared pair of electrons towards itself. As you move from left to right across the periodic table, electronegativity increases, and as you move down the table electronegativity decreases.

Hence, option A is correct.

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If an astronaut travels to Mars, the mass of the astronaut will decrease on Mars when she arrives. The correct option is B.

The force of gravity is a force that is responsible for the presence of everything object and human in their place. It gives weight to an object. Without gravity, everyone will be floating in the air.

The force of gravity is different in different places. Like on the earth, there is a strong force of gravitation. On the moon, there is the less gravitational force. In mars, there is less gravitation force than on earth.

Because there is less gravitational force on Mars than on the earth, so the weight of the astronaut will be lower on Mars than on the earth.

Thus, the correct option is B. The mass of the astronaut will decrease on Mars.

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Answer:

the answer is 1.227

The number of electrons that must be gained or lost to achieve a noble gas electron configuration depends on the electron configuration of the atom or ion in question. It is determined by the number of electrons needed to either fill or empty the valence shell to match the electron configuration of the nearest noble gas.

To achieve a noble gas electron configuration, an atom must have a completely filled valence shell. This means that it must either gain or lose electrons to either fill or empty the valence shell.
a. A potassium atom has 19 electrons with the electron configuration of [Ar] 4s1. To achieve a noble gas electron configuration, it needs to lose one electron from its valence shell, which is the 4s subshell, to have the electron configuration of [Ar]. Therefore, a potassium atom must lose one electron to achieve a noble gas electron configuration.
b. An aluminum ion has 13 electrons with the electron configuration of [Ne] 3s2 3p1. To achieve a noble gas electron configuration, it needs to lose three electrons from its valence shell, which is the 3p subshell, to have the electron configuration of [Ne]. Therefore, an aluminum ion must lose three electrons to achieve a noble gas electron configuration.
c. A bromine atom has 35 electrons with the electron configuration of [Ar] 3d10 4s2 4p5. To achieve a noble gas electron configuration, it needs to gain one electron to fill its 4p subshell, which is the valence shell, to have the electron configuration of [Ar]. Therefore, a bromine atom must gain one electron to achieve a noble gas electron configuration.

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The standard formation reaction of solid lead(II) nitrate (Pb(NO₃)₂) can be represented by the balanced chemical equation:

Pb(s) + 2 NO³⁻(aq) → Pb(NO₃)₂(s)

In this reaction, solid lead (Pb) reacts with two nitrate ions (NO³⁻) to form solid lead(II) nitrate (Pb(NO₃)₂). The coefficients in the balanced equation indicate the stoichiometric ratios between the reactants and products, ensuring that the equation obeys the law of conservation of mass.

The equation is balanced to ensure that the number of atoms of each element is the same on both sides of the equation. In this case, the equation is already balanced with one lead atom on both sides and two nitrate ions on both sides.

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The term used to identify anything that occupies space is matter. The correct option is b).

Matter refers to anything that has mass and takes up space. It includes all physical substances, such as solids, liquids, gases, and plasma. Matter is composed of atoms, which are the building blocks of all substances. Atoms consist of a nucleus of protons and neutrons, surrounded by a cloud of electrons.

The properties of matter can be described in terms of its physical and chemical characteristics, such as its mass, density, color, and reactivity. Understanding the properties of matter is essential for many fields of science, including physics, chemistry, and materials science. Therefore, the correct is b).

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Answer:

88%.

Explanation:

The percentage yield of lead sulfate in this experiment is 88% if 2.53 is divided by 2.85 and multiply by 100. The percentage yield can be calculated when the experimental yield is divided by theoretical yield and then multiply by 100. The percentage yield tells us about the actual yield that is gained in the end of experiment which is lower than theoretical yield.

Answer:

Soil permeability

Explanation:

Soil permeability is the ease with which gases, liquids or plant roots can penetrate or pas through the soil.

It is an important factor when considering soil property for agricultural purposes.

Answer:

Soil permeability

Explanation:

Answer:

Explanation:

The question requires us to calculate the volume (in L) of a gas under the conditions given.

The following information was provided by the question:

Initial volume of gas = V1 = 2.00 L

Initial temperature of gas = T1 = 25.0 °C

Initial pressure of gas = P1 = 1.08 atm

Final temperature of gas = T2 = 100 °C

Final pressure of gas = P2 = 1.50 atm

To solve this problem, we'll need to apply the equation of ideal gases (shown below) twice: first, to determine the number of moles of gas, and again to calculate the volume of gas under the final conditions. Note that we'll determine the number of moles of gas under the initial conditions because this amount won't change (as we're talking about the same sample of gas).