An ionic bond occurs between what particles?
two negative ions
a positive and negative ion
two positive ions
two neutral atoms
​

Answer: a truck crashes into a car

Explanation:

The truck drives in a wrong motion which makes the reaction of it crashing.

The pH of a solution obtained by dissolving two extra-strength aspirin tablets containing 540 mg of acetylsalicylic acid each in 420 mL of water is 2.94.

Given that Ka of acetylsalicylic acid (HC9H7O4) is 3.3×10−4 at 25 ∘C and two extra-strength aspirin tablets containing 540 mg of acetylsalicylic acid each is dissolved in 420 mL of water. We have to find the pH of this solution.

The chemical equation for the dissociation of acetylsalicylic acid is: HC9H7O4 + H2O ⇌ H3O+ + C9H7O4^-Let 'x' be the concentration of H3O+ ions in the given solution. Then, the dissociation of the acid can be written as follows:3.3×10^-4 = x^2 / (0.108 − x). Using this equation and solving for 'x' gives the value of H3O+ as 5.10×10^-4. Therefore, pH = 2.94 which implies that the solution is acidic.

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Answer:

A. The reactants are changed to form the products.

Explanation:

Chemical reactions are reactions that involves a change in the chemical composition of substances involved while a nuclear reaction is the process of fusing together or splitting the nucleus of an atom. According to this question, matter is said to undergo both types of reaction.

However, one similarity in both chemical and nuclear reactions is that substances called REACTANTS are changed to form PRODUCTS. In nuclear reaction, the atoms joined or split are the reactants while the ones formed are the products.

Answer: A

Explanation:

Answer

Based on the previous we can say that: The law of conservation of the mass states that the total mass will always stay the same during a chemical reaction. After the reaction, the vessel will have a mass equal to the initial 245 g.

Explanation

The Law of Conservation of Mass states that the mass is neither created nor destroyed in chemical reactions. This means the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Based on the previous we can say that: The law of conservation of the mass states that the total mass will always stay the same during a chemical reaction.

After the reaction, the vessel will have a mass equal to the initial 245 g.

Answer:

1. B

2.C

3.D

4.Sorry don't this one :(

5.A

Explanation:

please give me at least 20 points ❤

The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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In Beaker A, an antacid tablet is added to 50 mL of 20ºC water. In Beaker B, an antacid tablet is added 50 mL of 70ºC water reaction occur faster in the beaker B

Antacid tablet are the medicine for acid in the stomach to relieve indigestion and heartburn and in the given data in beaker A the antacid tablet is added in 50mL of 20ºC water and then in beaker B an antacid tablet is added 50 mL of 70ºC water then in beaker B the reaction will occur fast because in beaker B the temperature of water is more than beaker A so the antacid tablet will dissolve fastly in more temperature than in less temperature

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The predicted volume of gas at 50 ºC is 0.53L.

The predicted volume of gas at 100 ºC is 0.61 L.

The predicted volume of gas at 150 ºC is 0.70 L.

Charles's law states that pressure remains constant, and the volume of gas is directly proportional to its temperature.

V  ∝ T

\(\frac{V_1}{T_1} =\frac{V_2}{T_2}\)                                                          ..................(1)

Given, the initial temperature of the gas, T₁ = 0 ºC = 273 K

The final temperature of the gas, T₂ = 50 ºC = 50 + 273 = 323 K

The initial volume of gas, V₁ = 0.45 L

\(\frac{0.45 }{273} =\frac{V_f}{323}\)

\(V_f =\frac{0.45\times 323 }{273} =0.53 L\)

The initial temperature of the gas, T₁ = 0 ºC = 273 K

The final temperature of the gas, T₂ = 100 ºC = 100 + 273 = 373 K

The initial volume of gas, V₁ = 0.45 L

\(\frac{0.45 }{273} =\frac{V_f}{373}\)

\(V_f =\frac{0.45\times 373 }{273} =0.61 L\)

The initial temperature of the gas, T₁ = 0 ºC = 273 K

The final temperature of the gas, T₂ = 150 ºC = 150 + 273 = 423 K

The initial volume of gas, V₁ = 0.45 L

\(\frac{0.45 }{273} =\frac{V_f}{423}\)

\(V_f =\frac{0.45\times 423}{273} =0.70 L\)

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Melt-away creamery combines sugar, cream, and best natural flavorings, then churns and freezes resulting mixture at low temperature, creating ice cream. This method is an example of process manufacturing.

A production method that creates goods by combining supplies, ingredients or raw materials using formula or recipe is called process manufacturing.

It is usually used in industries that produce bulk quantities of goods, like food, beverages, refined oil, gasoline, pharmaceuticals, chemicals and plastics. Process manufacturing is also known as a process industry and is defined as an industry, like the chemical or petrochemical industry, that is concerned with the processing of bulk resources into other products.

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Answer: Atomic Nucleus!

Explanation: All atoms have a dense central core called the atomic nucleus. Forming the nucleus are two kinds of particles: protons, which have a positive electrical charge, and neutrons, which have no charge.

(Yes, it was from google.)

Explanation:

Because of the earth and climate change the point of incidence mean that you mean by engineers to social evils activities.

(a) The probability that 4 or more people will have to be tested until 2 of them with the gene are detected is approximately 0.188.

(b) On average, around 5.333 people are expected to be tested until 2 of them with the gene are detected.

Volunteers are tested for a gene associated with an increased risk of a particular disease, the probability of an individual carrying the gene is given as 0.5. The question asks for the probability that at least 4 people need to be tested until 2 individuals carrying the gene are identified.

To calculate this probability, we can make use of the concept of the geometric distribution. The geometric distribution models the number of trials needed to achieve the first success (in this case, identifying an individual with the gene). The probability of success on each trial is denoted as p, which is the probability of an individual carrying the gene.

In this scenario, p = 0.5, and we want to find the probability that it takes at least 4 trials to achieve 2 successes. To calculate this probability, we need to find the sum of the probabilities of 4 or more trials until 2 successes are obtained.

Using the complement rule, we can subtract the probability of having 0, 1, or 3 successes from 1 to find the probability of having at least 2 successes. The probabilities for these cases are as follows:

P(0 successes) = (1 - p)^4 = (0.5)^4 ≈ 0.0625

P(1 success) = 4 * p * (1 - p)^3 = 4 * 0.5 * (0.5)^3 ≈ 0.2500

P(3 successes) = 4 * p^3 * (1 - p) = 4 * (0.5)^3 * 0.5 ≈ 0.2500

Subtracting these probabilities from 1, we get:

P(at least 2 successes) = 1 - P(0 successes) - P(1 success) - P(3 successes)

                      ≈ 1 - 0.0625 - 0.2500 - 0.2500

                      ≈ 0.4375

Therefore, the probability that 4 or more people will have to be tested until 2 of them with the gene are detected is approximately 0.438 (rounded to three decimal places).

To calculate the expected number of people to be tested until individuals with the gene are detected, we can use the concept of the negative binomial distribution.

The negative binomial distribution models the number of trials needed to achieve a fixed number of successes. In this case, we want to find the average number of trials until 2 successes (individuals with the gene) are obtained.

The expected value of the negative binomial distribution is given by the formula: E(X) = r/p, where r is the number of successes required and p is the probability of success on each trial.

In this scenario, r = 2 and p = 0.5. Plugging these values into the formula, we get:

E(X) = 2/0.5 = 4

Therefore, on average, approximately 5.333 people are expected to be tested until 2 individuals with the gene are detected.

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 The answer  is impossible to determine the values of ΔH.  So, definite answer cannot be provided.

In order to determine if the heat of reaction is absorbed or released in trial 3,

the values of ΔH of trial 1 and trial 2 have to be compared.

If ΔH of trial 3 is less than ΔH of trial 2 and ΔH of trial 1, then the heat of reaction is released.

If ΔH of trial 3 is greater than ΔH of trial 2 and ΔH of trial 1, then the heat of reaction is absorbed.

However, without information on what kind of reaction or experiment is being performed in the trials,

it is impossible to determine the values of ΔH.

Therefore, a definite answer cannot be provided.

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Answer:

The elements on the left-side of the periodic table are relatively electron deficient. So due to their comparatively low effective nuclear charges (the net positive charge of the protons minus the shielding core electrons below the valence level), their electrostatic hold on these electrons are weak.

Elements further right on the period table though,  have higher effective nuclear charges and stabilize electrons more effectively. Which leads to localized covalent bonding and the formation of molecules.

The right side contains non metals while the left side contains metals.

Metals lose electrons (negative electrons). They now have more protons,  therefore making the ion positive.

Non metals gain electrons (positive electrons). So the ion has more electrons than protons which makes the ion negative.

Cellular respiration can occur either anaerobically (without oxygen) or aerobically. Glucose and oxygen interact during aerobic cell respiration. As byproducts, both water and carbon dioxide are produced.

In the majority of cells, glycolysis turns glucose into pyruvate, which mitochondrial enzymes then oxidize to produce carbon dioxide and water. However, due to the absence of mitochondria in some platelets, most notably adult red blood mitochondria, glycolysis serves as the only method of ATP synthesis.

The carbon dioxide moves out of the circulation, via the capillaries, and onto the alveoli where it is ejected, while at the same time oxygen bonds with hemoglobin to be transported back to the tissues once the venous returns to the lungs.

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The balanced chemical reaction equation is;

2Ca(OH)2(aq)+H2SO4(aq)—→ CaSO4(s)+2H2O(l)

The symbolic representation of a chemical reaction is a chemical equation. To describe the reactants, products, and associated quantities involved in a chemical reaction, chemical formulae and symbols are used. The equation illustrates how chemical reactions can change one or more compounds (reactants) into new substances (products).

The direction of the reaction is shown by an arrow connecting the reactants and products, which is often pointing from left to right. The arrow could either "reacts to form" or "yields."

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Answer:

Fe(s) + Cu2+(aq) ===> Fe2+(aq) + Cu(s)

Answer:

2CuFeS2+2SiO2+4O2→Cu2S+2FeSiO3+3SO2(1)

Explanation:

2CuFeS2+2SiO2+4O2→Cu2S+2FeSiO3+3SO2(1)

Answer:

Explanation:This unequal distribution of electrons is known as a polar covalent bond, characterized by a partial positive charge on one atom and a partial negative charge on the other. The atom that attracts the electrons more strongly acquires the partial negative charge and vice versa.

Answer:  There are many properties of a metal which is taken into consideration when it is used for construction

Explanation:

The properties can be physical, chemical, et cetera. The physical properties that is considered are:

1. Durability:  It can be defined as the property of the material to withstand the atmospheric pressure and other factors.

2. Density: The ratio of mass by volume of a material (homogeneous material) is called as density.

3. Fire resistance: The ability of the material to withstand in fire without changing its size or shape.

4. Weather resistance: The ability of the material to withstand the weather which could be variable round the year.

5.Water absorption: The ability of the material to absorb water and retain it.

The mass of hydrogen reacted with nitrogen to give ammonia is 0.1 grams.

Mass of any substance will be calculated by using the moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

3H₂ + N₂ → 2NH₃

Moles of 0.575 g of NH₃ will be calculated as:

n = 0.575g / 17.03g/mol = 0.033 moles

From the stoichiometry of the reaction, it is clear that:

2 moles of NH₃ = produced by 3 moles of H₂

0.033 moles of NH₃ = produced by 3/2×0.033=0.0495 moles of H₂

Now we calculate the mass of hydrogen from the given moles and molar mass as:
W = (0.0495mol)(2.0158g/mol) = 0.09 grams = 0.10 grams

Hence, option (a) is correct i.e. 0.1 grams.

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A pitcher of orange juice flow smoothly when you transfer it to another container because of lower viscosity value and large proportion of water in it.

Viscosity is the resistance of a fluid to a change in shape or movement of portions as compared to one another. High viscous moves slowly as compared to less viscous.

So we can conclude that a pitcher of orange juice flow smoothly when you transfer it to another container due to lower viscosity.

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Answer:

Animal remains are most likely to be fossilized if their hard parts are covered by layers of sediments soon after death. With time and pressure, these sediments, such as sand, plant debris, or ash, become compressed into rock. Therefore, fossils are found in sedimentary rock, like sandstone, shale, limestone and coal.

Explanation:

As per this case the test tube will be heated so the unwanted gas will be wiped out and only the vapors of our gas will sustain in the flask

what are flasks used for?

There are different types of flasks used in chemistry laboratories they are mainly used for weighing chemicals, preparing stock solutions, preparing reacting solutions and many more.

The test tube will only contain the vapour that is necessary to compute the molar mass because, as you heat this gas, you are producing enough vapour to drive away the air and keep the liquid's vapour present. so that there is no need to weigh the flask before heating the volatile liquid

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Answer:

Percent yield = 85.23%

Explanation:

Given data:

Theoretical yield = 7.99 g

Actual yield = 6.81 g

Percent yield of CaO = ?

Solution:

Formula:

Percent yield = ( actual yield / theoretical yield ) × 100

by putting values,

Percent yield = (6.81 g/ 7.99 g) × 100

Percent yield = 0.8523× 100

Percent yield = 85.23%

Answer:

cholera and salmonella

Explanation:

i believe so

Answer: It appears as though fresh water has a surface tension of 72.5 mN/m

Explanation: Since fresh water does not have a high concentration of salt, and pure fresh water has no salt at all, you are trying to find the value of surface tension at 0% salinity. At 0% salinity, the surface tension value is 72.5 mN/m

Answer: He provided a 3 time period where there families appeal to there conviction.

Answer:

1 - Evaporation

2 - Evapotranspiration

3 - Condensation

4 - precipitation

5 -  River Discharge

6 - Infiltration

Explanation:

I hope I'm right. Good luck.

Answer:

propa-1-nol

Explanation:

easy clapp