HELP !!!!!!! pls. with chemistry

HELP !!!!!!! Pls. With Chemistry

Answers

Answer 1

Answer:

Qns no.3: it is not a correct answer

Explanation:

S has 6 outermost electrons and O has 6 outermost electrons, during bonding inorder to be stable their shouldn't be any unpaired electron in a structure. so 2 double bonds will be formed.

HELP !!!!!!! Pls. With Chemistry

Related Questions

This is the name of the variable in a scientific experiment that is controlled by the scientist

O Negative control
O Independent Variable
O Dependent Variable
O Positive control

Answers

Positive control !!!!!

Answer:

b.Independent variable

Explanation:

The independent variable is the one that is changed by the scientist. To insure a fair test, a good experiment has only one independent variable. As the scientist changes the independent variable, he or she records the data that they collect.

.

how to balance by hit and trial method reaction
zn + Hcl - Zncl2 + Hcl


Answers

The balanced equation by hit and trial method is:

Zn + 2HCl → ZnCl2 + H2

Because a metal is replaced by another metal, the interaction between hydrochloric acid and zinc produces a single-displacement reaction.

This can be shown by,

B + CD → BD + C

There are two requirements: either B and D must be different metals (or any element that may form a cation, such as a hydrogen), while C must be an anion, or B and D must be halogens, while C must be a cation.

Count the Zn, Cl, and H atoms on each side of the chemical equation to balance the HCl-Zn reaction equation. To balance the equation, just alter the coefficients or the numbers that come before the atoms or compounds. The equation appears as follows after the coefficients have been changed:

ZnCl2 + H2 → Zn + 2HCl

Balance the molecular equation first.

Zn + 2HCl → ZnCl2 + H2

The net ionic equation will be, once the number of ions on both sides of the reaction is equalized by crossing them out.

Zn + 2H+ + 2 Cl– → Zn2+ + 2Cl– + H2

The balanced equation will be,

Zn + 2HCl → ZnCl2 + H2

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What is the strength and weakness of vaccines ?

Answers

Answer:

Strength:

can prevent diseases from making you ill

Weakness:

the virus/bacteria can change shape and look and your body and the vaccine won't be able to recognize it anymore

How many protons and electrons are present in one Br -ion2

Answers

Answer:

Br- has 35 protons and 36 electrons

Explanation:

Do you mean Br-?

Br has atomic number of 35 => 35 protons.

Neutral Br has 35 electrons.

Br- has 1 extra electron, resulting in total of 36 electrons.

The chemical equation below shows reactants and products.
6CO₂ +12H₂O+light + enzymes - C6H12O6 +602 + 6H₂O
Which statement is BEST supported by analyzing this equation?
A. CO, is made from the chemical reaction.
B. No new compounds are made from this reaction.
C. O,, oxygen gas, is needed to make the reaction start.
D. The atoms rearrange in the chemical reaction so that CeHuO.
glucose, is made.

Answers

Option D. The atoms rearrange in the chemical reaction so that glucose is made.

A chemical reaction is a manner in which one or extra substances, the reactants, are transformed into at least one or extra different materials, the goods. materials are both chemical factors or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create one-of-a-kind substances as merchandise.

Examples of chemical reactions in everyday life consist of photosynthesis, rust, baking, digestion, combustion, chemical batteries, fermentation, and washing with soap and water. Chemical reactions arise everywhere in the global around you, now not simply in a chemistry lab.

On the idea of the product fashioned, special forms of reactions are Combustion response, Decomposition response, Neutralization response, Redox response, Precipitation or Double-Displacement reaction, Synthesis response

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Look at the atoms of the molecules used for london dispersion forces and diople-dipole forces. What do you notice about the difference in these atoms and waht explanation do you have for why that difference leads to different intermolecular forces?

Answers

The difference between the molecules that have dipole forces and those that have London forces is that the molecules that have dipole forces are polar while those that have London forces are not.

What is the dipole forces?

We know that dipole forces are one of the kinds of intermolecular forces that exist. Let us note that a molecule is composed of the primary bond forces that hold the atoms of the molecule together and then the secondary bond forces that do hold the molecules together.

Now, the kind of interactions that exists between the molecules is the reason for the properties of the compound that we see. The molecules have not been shown here but I would discuss the properties of the London forces and the dipole forces.

Note that the molecules that do have the dipole forces have an electronegativity difference between the atoms of the molecule. The molecules that have the London forces are largely non polar.

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In an investigation of the decomposition of water, a student compared the amount
of oxygen in one test tube to the amount of hydrogen in the other test tube. Which
of the following statements is correct about the comparison?
A. There is twice as much oxygen as hydrogen.
B. There is an equal amount of oxygen and hydrogen.
C. There is one-half as much oxygen as hydrogen.
D. There is four times as much oxygen as hydrogen.

Answers

In an investigation of the decomposition of water, a student compared the amount of oxygen in one test tube to the amount of hydrogen in the other test tube is There is one - half as much as hydrogen.

In decomposition of water , water can be broken into the hydrogen gas and the oxygen gas. The water decomposition reaction is given as :

2H₂O   ------>     2H₂     +     O₂

The ratio of  hydrogen and oxygen in the decomposition reaction of water is 2 : 1.

Thus, In an investigation of the decomposition of water, a student compared the amount of oxygen in one test tube to the amount of hydrogen in the other test tube is There is one - half as much as hydrogen.

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If a sulfuric acid (H₂SO₄, MM = 98.09 g/mol) solution is completely neutralized with 61.37 mL of the NaOH solution above what was the mass in grams of sulfuric acid in the solution. Remember, you need a balanced chemical reaction for stoichiometry. (do not forget about SF)

Answers

Assuming the concentration of the NaOH solution that reacted with the sulfuric acid is 1.0 M, the mass of the sulfuric acid that reacted is 3.01 g.

What is a neutralization reaction?

A neutralization reaction is a reaction in which an acid reacts with a base to form salt and water only.

In the given reaction, a given amount of sulfuric acid was neutralized by 61.37 m:L of a NaOH solution.

The equation of the neutralization reaction is given below:

2 NaOH (aq) + H₂SO₄ (aq) ----> Na₂SO₄ (aq) + 2 H₂O (l)

The mole ratio of the reaction shows that 2 moles of NaOH solution will react with 1 mole of H₂SO₄ solution.

The moles of NaOH reacting = concentration * volume in liters

The concentration of the NaOH solution is not given. Assuming the concentration of the NaOH solution is 1.0 M

Moles of NaOH reacted = 1.0 * 61.37 mL * 1 L / 1000 mL

Moles of NaOH reacted = 0.06137 moles

Moles of  H₂SO₄ reacted = 0.0614 / 2

Moles of  H₂SO₄ reacted = 0.0307 moles

Mass of  H₂SO₄ reacted = 0.0307 * 98.09

Mass of  H₂SO₄ reacted = 3.01 g

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Question is in picture below!

Answers

The order of boiling point from the highest to the lowest from the given compounds above are as follows:

CH3CH2CH2CH2CH2OH - CH3CH2CH2CH2CH2Br - CH3CH2CH2CH2CH3 - CH3CH2CH3.

The correct order is option b, d, c and a.

What is meant by boiling point of substances?

The boiling point of substances can simply be defined as that temperature at which liquids boils and then change to vapor or steam.

However, from the above given task, the organic compound, CH3CH2CH2CH2CH2OH has the same boiling simply because of its power to participate in hydrogen bond formation. This compound CH3CH2CH2CH2CH2OH is known as 1-pentanol.

So therefore, we can confirm that the compound from above the correct order of boiling point from the highest to the lowest is 1-pentanol, 1-bromopentane, pentane and propane respectively.

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10. In which of the following situations is a biotechnologist most likely to decide to use directed evolution as an enzyme engineering technique as opposed to rational design?
A) When a structure of the
enzyme is available to aid engineering
B) When the enzyme can only be
screened in a low throughput manner
C) When the enzyme mechanism
is understood and provides insight to engineering
D) When current data allows
molecular modelling techniques to be used predictively
E)When none of the above are true

Answers

A Biotechnologist decides to use directed evolution as an enzyme engineering technique when the enzyme mechanisms is understood and provides insight to engineering Why is directed evolution important?

A potent method for enhancing the functionality of proteins is directed evolution. When the biological function is unclear or there is little chemical understanding of the substrate and protein structure, directed evolution generates hundreds of variants in order to find the optimal solution.

What is enzyme engineering technique?

In order to increase the usefulness and activity of existing enzymes, enzyme engineering approaches use recombinant DNA technology to develop new proteins and enzymes with designer functions.

What is rational design?

In synthetic science and biomolecular designing, sane plan (RD) is an umbrella term which welcomes the system of making new particles with a specific usefulness, in light of the capacity to foresee how the atom's construction (explicitly got from themes) will influence its conduct through actual models.

Hence, Biotechnologist most likely to decide to use directed evolution as an enzyme engineering technique as opposed to rational design when the enzyme mechanism is understood and provides insight to engineering .

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At a crime scene, Lorenzo finds a gun in shallow pond water. How should he transport the gun to BEST preserve the evidence?

A.
He should drain the water and then put the gun in a plastic bag.

B.
He should rinse the gun, dry it, and then put it in a paper bag.

C.
He should clean the gun and collect a separate water sample.

D.
He should keep the gun submerged in water as he transports it.

Answers

Answer:d

Explanation:

How many Joules are needed to increase the temperature of 150 g of water from 313K to 338 K?

Answers

-18,037.5  are joules are needed to increase the temperature of 150 g of water from 313K to 338 K.

What is joules?

In the International System of Units (SI), a joule is a unit of work or energy equal to the work done by a force of one newton acting through one metre. It is named after the English physicist James Prescott Joule and equals 107 ergs, or about 0.7377 foot-pounds. The joule is equal to one watt-second in electrical terms, which is the amount of energy released in one second by a current of one ampere through a resistance of one ohm.

The distinction between heat and temperature can be difficult to grasp. Heat is essentially the total amount of kinetic energy that a substance's molecules contain, and it is measured in joules (J). Temperature is measured in degrees and is proportional to the average kinetic energy of the individual molecules. When the same quantity of heat is applied to different materials, the temperature rises at varying rates depending on the substance's specific heat capacity. If you know the amount of the substance and its specific heat capacity, you may determine the final temperature.

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How is a tornado different from a hurricane
A. A tornado causes less damage to an ecosystem
B. A tornado brings more rain
C. A tornado is much smaller
D. Hurricanes do not impact life on land

Answers

Answer: C. A tornado is much smaller

Explanation: A tornado can be a mile long while hurricanes can be 50 miles long.

The correct answer is C. A tornado I’s much smaller

Please help me


Is this reaction endothermic or endothermic?

CIO + O - CI + O^2

Answers

This reaction, CIO + O - CI + O2, is an example of an endothermic chemical reaction, where the reactants take heat energy from their environment and use it to create products.

Explanation of endothermic?

Endothermic chemical reactions occur when the reactants take in heat energy from their environment to create products. A cooling effect is produced by these reactions because they cause their surroundings to become cooler.

How are endothermic and exothermic different?

Exothermic means that the chemical reaction releases energy. In exothermic reactions, bonds are broken in the reactants, but more energy is released when the bonds are broken in the products. Endothermic chemical processes are those that take up (or utilize) energy.

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Are there substances in the lab that have bonds that are not strictly ionic, covalent, or metallic? Explain your answers.

Answers

Metallic bonds occur amid metal atoms. Whereas ionic bonds combine metals with non-metals, metallic bonding fixes several metal atoms.

What determines bond is ionic, covalent, or metallic?

An ionic bond is formed by joining a metal and a nonmetal, while a covalent bond is formed by allying two nonmetals. So we check the periodic table to see if our compound is made up of metals or nonmetals, or of two nonmetals.

Covalent compounds are built when two nonmetals react with each other. Since hydrogen is a nonmetal, binary compounds that carry hydrogen are also usually covalent compounds. Metallic elements produced compounds with non-metallic elements with the help of ionic bonds.

So we can conclude that In metals, the electrons leave the outer shells of metal atoms, devise positive metal ions and a 'sea' of delocalized electrons.

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State the composition of the alloy to make rings

Answers

Explanation:

Write a short report describing your ideas for a school of the future. You can suggest changes to:

• school buildings and classrooms.

• the library

• the cafeteria

• how classes are taught.

Give a reason for each of your suggestions. Use a variety of synonyms and accurate vocabulary.

200 words only

Is it polar or non polar ?

Answers

It’s option A, trigonal bipyramidal, non polar




















iupac name
answerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

Answers

Answers answer questions and

Hydrogen atoms absorb energy so that electrons can be excited to the n = 6 energy level. Electrons then undergo these transitions, among others: (a) n = 4 → n = 3 (b) n = 6 → n = 3 (c) n = 5 → n = 4 (i) Which transition produces a photon with the least energy? (ii) Which transition produces a photon with the highest frequency? (iii) Which transition produces a photon with the shortest wavelength?

Answers

1) The transition that produces the least energy is n = 4 → n = 3

2) The transition that produces a photon with the highest frequency is n = 6 → n = 3

3) The  transition that produces a photon with the shortest wavelength n = 4 → n = 3

What is the Bohr model?

We know from the Bohr model that an electron that is found in the hydrogen atom can be moved from a lower to a higher energy level and that would happen when the electron is able to absorb energy in the form of visible light.

Looking at the transitions as we have it here, we can see that the photon that would photons produce the least energy would be two levels that are closest together.

Also, the photon that would have the highest frequency is the photon that is involved in the transition that has the furthest energy apart from each other.

The transition that produces  a photon with the shortest wavelength must also be farthest  apart in energy.

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A solution is prepared by dissolving sodium benzoate and benzoic acid in water to give a 9 mmol/litre concentration of each compound. The mixture has a pH of 4.21 at 25oC. Calculate the acid dissociation constant of benzoic acid, Ka.
Hint: pH = pKa + log10 ·[sodium benzoate] / [benzoic acid]

Answers

A solution is prepared by dissolving sodium benzoate and benzoic acid in water to give a 9 m mol / liter concentration of each compound. The mixture has a pH of 4.21 at 25 °C. the acid dissociation constant of benzoic acid, Ka is 6.1 × 10⁻⁵.

the pH of solution is given as :

pH = pka + log ( [sodium benzoate / benzoic acid])

4.21 = pka + log 1

pka = 4.21

pka = - log ka

ka = 10^- pka

ka = 6.2 × 10⁻⁵

Thus, A solution is prepared by dissolving sodium benzoate and benzoic acid in water to give a 9 m mol / liter concentration of each compound. The mixture has a pH of 4.21 at 25 °C. the acid dissociation constant of benzoic acid, Ka is 6.1 × 10⁻⁵.

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what mass of iron(III) oxide must be used to produce 10.6g iron?

Answers

The mass of iron (II) oxide that must be used to produce 10.6 g of iron would be 14.37 grams.

Stoichiometric problem

Iron is produced from iron (II) oxide by reacting with carbon monoxide according to the following equation:

[tex]Fe_2O_3 + 3CO -- > 2Fe + 3CO_2[/tex]

The equation already obeys the law of conservation of atoms. Hence. it is a balanced equation.

The mole ratio of iron (III) oxide that reacts and the iron that is produced according to the equation is 1:2.

Now, in a particular reaction involving iron (III) oxide and carbon monoxide, 10.6 grams of iron were produced. The amount of iron (III) oxide used can be obtained using the mole ratio from the balanced equation of the reaction.

Recall that: mole = mass/molar mass

Molar weight of iron = 56 g/mol

Mole of 10.6 g of iron = 10.6/56

                                    = 0.19 moles

Since the mole ratio is 1:2, the equivalent mole of iron (III) oxide that reacts can be obtained:

                  0.19/2 = 0.09 moles

Molar mass of iron (III) oxide = 159.69 g/mol

Mass of 0.09 mol iron (III) oxide = 0.09 x 159.69

                                                    = 14.37 grams

Thus, the amount of iron (III) oxide that must be used to produce 10.6 g of iron would be 14.37 grams.

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please help!!!! ⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️

Answers

Polyatomic ions: [tex]CH_3COO^-[/tex], [tex]NO_3^-[/tex], [tex]NH^+[/tex], [tex]CN^-[/tex], [tex]Li^+[/tex], and [tex]OH^-[/tex]

Monatomic ions: [tex]Ca^{2+[/tex], [tex]O^{2-[/tex], and [tex]Fe^{3+[/tex]

Monoatomic vs Polyatomic Ions

In chemistry, monoatomic ions are ions that consist of only a single type of atom. They are usually positive or negatively charged and are otherwise known as simple ions. Examples include  [tex]Ca^{2+[/tex], [tex]O^{2-[/tex], and [tex]Fe^{3+[/tex]

Polyatomic ions, on the other hand, are ions that consist of more than one atom, unlike monoatomic ions. The two or more atoms are covalently bonded and the entire structure behaves like a single chemical entity in reactions. Polyatomic ions are otherwise known as molecular ions.

Examples of polyatomic ions are  [tex]CH_3COO^-[/tex], [tex]NO_3^-[/tex], [tex]NH^+[/tex], [tex]CN^-[/tex], [tex]Li^+[/tex], and [tex]OH^-[/tex]

Thus, from the diagram:

Polyatomic ions: [tex]CH_3COO^-[/tex], [tex]NO_3^-[/tex], [tex]NH^+[/tex], [tex]CN^-[/tex], [tex]Li^+[/tex], and [tex]OH^-[/tex]Monatomic ions: [tex]Ca^{2+[/tex], [tex]O^{2-[/tex], and [tex]Fe^{3+[/tex]

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At 125 °C a gas has a volume of 145 mL. What will the volume be at 25.0 °C ?

Answers

If a gas has a volume of 145 mL at 125 °C, then it will have 108.56 mL at 25 °C.

According to Charles’ law, the volume of a gas is directly proportional to the temperature.

Thus, V1/T1=V2/T2 .......(i)

Here, V1 ⇒ initial volume

T1  ⇒ initial temperature in Kelvin

V2 ⇒ final volume

T2 ⇒ final temperature in Kelvin.

In the given question:

V1 = 145mL

T1 = 125°C= (125+273)K= 398K

T2 = 25°C= (25+273)K= 298K

Putting these values in equation (i),

145mL / 398K = V2 / 298K

Solving for V2, we get

V2 = 145mL * 298K /398 K

V2 = 108.56 mL

Therefore, at 25 °C, the gas will have a volume of 108.56 mL.

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What does atomic number describe?
Responses

mass

mass

number of protons

number of protons

number of neutrons

number of neutrons

atomic weight

Answers

Answer:

Number of protons in the nucleus of an atom

convert 0.87 atm to inches Hg. please explain step by step

Answers

Answer:

26.03 inHg

Explanation:

1 atm = 29.92 inHg

0.87 atm = 29.92 inHg x 0.87

0.87 atm = 26.03 inHg

how without making any quantitative measurements could you determine if a piece of plastic has a density greater or less than 1 g/cm

Answers

To determine if the piece of plastic has a density greater or less than 1 g/cm³, the piece of plastic is placed in water, if it sinks, it has a greater density, but if it floats, it has a lesser density.

What is an appropriate method to determine if a piece of plastic has a density greater or less than 1 g/cm³?

The density of a substance measure how compact the substance is.

For fluids such as water, objects that are denser than water will sink in water. However, if the density is less than that of water, it will float in water.

The density of water is 1 g/cm³.

Hence, objects that have densities greater than 1 g/cm³ will sink in water, whereas objects that have densities less than 1 g/cm³ will float in water.

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why were gold and copper the first forms of matter investigated by humans??

Answers

Gold and copper were the first forms of matter investigated by humans because they were pretty and have a shiny appearance.

Gold and copper have a shiny face and they were used in the production of ornaments and jewelry. Along with jewelry many other precious items were made from gold and copper. Gold and copper were so valuable forms of matter and they are also economically used by many countries. Gold was mostly used in making of ornaments and copper was used in making of frames.

In today's modern world mainly gold is one of the most precious element which is obtained for economical use.

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Without using the periodic table, determine the group, period, and block of an atom with the following electron configurations a. [ne]3s^2

Answers

The element is in 2nd group, 3rd period and s block.

How to check the group, period and block of the elements by looking at the electronic configuration?

The total number of valence electron gives us the group, the total number of shells gives us the period and the shell which the valence electron is entering tells us about the block it belongs to.

In [Ne]3s2, the valence electron is 2, the number of shells is 3 that is 1,2 and 3. the valence electron is entering the the s subshell.

Therefore, in [Ne]3s2, the group is 2nd, the period is 3 and it belongs to s block.

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An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. What is the density of the object.

Answers

An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. the density of the object is 3 g/mL.

given the data as follows :

mass of object  =  18 g

volume of object = final volume - initial volume

volume of object = 26 mL - 20 mL

                             = 6 mL

the density expression is given as:

Density = mass / volume

Density = 18 g / 6 mL

Density = 3 g/mL

Thus, An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. the density of the object is 3 g/mL

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How do I balance these equations? Please explain so I can learn how.

Answers

One mole of CS₂ and two moles of H₂S are formed as products and 3 moles of CH₄ are leftover.

What is the limiting reagent?

A limiting reagent is a reactant that is fully exhausted from the reaction mixture at the completion of a  reaction. The limiting reactant will decide the maximum amount of product.

Given, a balanced chemical equation of the reaction between methane and sulphur is:

[tex]CH_4 + 4S\longrightarrow CS_2 +2H_2S[/tex]

Given, the number of moles of the sulphur = 4

The number of moles of methane = 4

From the chemical reaction, one mole of methane reacts with four moles of sulphur. Therefore, four moles of sulphur fully react with one mole of methane and three moles of methane leftover.

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Show your reasoning. a vehicle speeds through a red light as julie rides through an intersection her bicycle. the vehicle very nearly hits julie. julie's emotional arousal is likely to be accompanied by: an election to appointdelegates to a partyconference or to select thecandidates for a general,especially presidential,electionelectoralcollegenomineeprimaryelection which of the following changes occur when an acid solution of unknown concentration is titrated with a standardized solution of naoh? select all that apply. multiple select question. the color of the indicator slowly changes over the course of the titration. the ph of the acid solution decreases. the concentration of h ions in the acid solution decreases. the ph of the acid solution increases. A coffee company surveyed 40 potential customers to see where they wouldlike the company's new organic coffee sold. 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Twenty more restaurant-purchased meals will be eaten in a restaurant than which of the following statements is false? a scalar processor processes one data item at a time. vliw architectures execute instructions in parallel based on a fixed schedule determined when the code is compiled. superscalar architectures with speculative executions are suitable for embedded processors in a vector processor, a single instruction operates simultaneously on multiple data items. how might you know that you are at a point of diminishing returns, or where more study will not benefit you like it did before? a group of friends were working on a student film. they spent $54 on costumes, which was 9% of their total budget. what was the total budget for their student film? use the distributive property to solve the equation 2x - 4(x - 2) = - 8 + 4x + 4 a company issues 6% bonds with a par value of $150,000 at par on january 1. the market rate on the date of issuance was 5%. the bonds pay interest semiannually on january 1 and july 1. the cash paid on july 1 to the bond holder(s) is: FourFour students, Ryan, Angel, Evan and Oliver wereshipwrecked on an island. Having no food they went towork gathering pineapples. After gathering pineapples,they were tired and all fell asleep. After another while,Angel woke up and was very hungry and so she ate 1/3of the pineapples - more than her proper share.Shewent back to sleep. Evan woke up and, beinghungry, ate 1/3 of the remaining pineapples and wentback to sleep.Oliver did the same. When Ryan woke up,he only took his rightful share of the remainingpineapples. Then there were 6 pineapples left. Howmany pineapples did they all gather? The roc is the only monster in this selection that is not a hybrid; it is simplya vastly oversize bird. Do you think the roc qualifies as a monster? Explainyour reasoning. question the probability that a randomly selected visitor to a certain website will be asked to participate in an online survey is 0.40. avery claims that for the next 5 visitors to the site, 2 will be asked to participate in the survey. is avery interpreting the probability correctly? responses yes, because 2 out of 5 is equal to 40%. yes, because 2 out of 5 is equal to 40%. yes, because participants in the survey are selected at random. yes, because participants in the survey are selected at random. no, because there could be voluntary response bias. no, because there could be voluntary response bias. no, because only 40% of all people will visit the site. no, because only 40% of all people will visit the site. no, because 0.40 represents probability in the long run over many visits to the site. Which sentence from this excerpt is a major supporting detail?"The responsibility to issue drivers' licenses and establish driving laws has always been given to individual states, andrequirements vary among states.""In 1903, Massachusetts and Missouri became the first states to have laws about licensing, and in 1908, Rhode Islandbecame the first state to require a driving test.""However, there is still disagreement about whether 16-year-olds are too young to drive.""In years prior, the responsibility for teaching new drivers had fallen on car salesmen, family, friends, or organizations suchas the YMCA."