Help me plssssssssss

Help Me Plssssssssss

Answers

Answer 1

Answer:

The answer for this selection is 4

Explanation:


Related Questions

The Arctic’s tundra, though very cold for much of the year, is said to be more strongly defined by its cool summer temperatures, instead of its winter lows. Why?

Because these low summer temperatures can cause a rain-shadow effect

Because these low summer temperatures limit the growth of plants in the summer

Because these low summer temperatures can rapidly changing weather

Because these low summer temperatures chase large land masses of ice that do not even totally melt in the summer.

Answers

Answer: Because these low summer temperatures limit the growth of plants in the summer

Explanation: Took the test!

In an ecosystem, like  Arctic's tundra,  though very cold for much of year, is said to be more strongly defined by its cool summer temperatures, instead of its winter lows because these low summer temperatures limit growth of plants in  summer.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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How many people were considered undernourished in Latin America and the Caribbean in 2018?

Question 4 options:

513.9 million


2.6 million


821.6 million


42.5 million

Answers

D . 42.5 million…………

The boulder shown below has a weight of 10,000 N & is 500 m above the ground. How much gravitational potential energy does the boulder have?

Answers

Answer:

5,000,000 joules

Explanation:

Formula for Potential Energy =mgh

mass*gravity*height

mass=weight ÷ by gravity

10000÷10= 1000

1000×10×500m=5,000,000 joules

how many grams of lead II chloride are produced from the reaction of 15.3 g of NaCl and 60.8 gr of Pb(NO3)2?

Answers

The mass, in grams, of lead that will be produced from the illustrated reaction would be 71.47 grams

Stoichiometric reactions

From the balanced equation of the reaction:

Pb(NO3)2 + 2NaCl ---> PbCl2 + 2NaNo3

Mole ratio of Pb(NO3)2 and NaCl = 1:2

Mole of 15.3 g NaCl = 15.3/58.4

 = 0.257 moles

Mole of 60.8 g PbCl(NO3)2 = 60.8/331.2

  = 0.184 moles

Thus, NaCl is limiting.

Mole ratio of NaCl to PbCl2 = 1:1

Mas of 0.257 moles PbCl2 = 0.257 x 278.1

 = 71.47 grams

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Am nevoie rapid de aceste exercitii

Answers

Answer:

I will find the answer for you

Explanation:

Just a minute

If you start with 10 carbon and 3 Hydrogen, what will you end with?

Answers

Hydrocarbons are composed of hydrogen and carbon only and the hydrocarbon produced will differ according to their mole ratio.

What are hydrocarbons?

Hydrocarbons are compounds composed only of carbon and hydrogen.

Hydrocarbons are very large families of compounds which have a common property of being combustible.

Hydrocarbons include:

alkanesalkenes and alkynes

The mole ratio of the carbon to hydrogen in each type of hydrocarbon differs.

Therefore, starting with 10 carbon and 3 Hydrogen, the hydrocarbon produced will differ according to their mole ratio.

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Why do we have to decide what to do in a day?

Answers

Answer:

otherwise you will be bord and have nothing to do

Explanation:

Because people like to keep busy/have things to do.

Otherwise, we would just be blobs and do nothing.

Which type of resources cannot be replenished by natural processes in a reasonably short period of time?

A: nuclear waste
B: natural resources
C: nonrenewable resources
D: renewable resources

Answers

C: Nonrewable resources
I believe that the answer is C.

If 3.500 moles of water react completely according to the following equation, how much heat must be absorbed in kilojoules? 6CO2+6H2O→C6H12O6+6O2ΔH=2,803 kJ

Answers

The amount of heat absorbed in kilojoules when 3.5 moles of water react is 1635.08 KJ

Balanced equation

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂  ΔH = 2803 KJ

From the balanced equation for above,

6 moles of water reacted to absorb 2803 KJ of heat

How to determine the heat absorbed

From the balanced equation for above,

6 moles of water reacted to absorb 2803 KJ of heat

Therefore,

3.5 moles of water will react to absorb = (3.5 × 2803) / 6 = 1635.08 KJ of heat

Thus, 1635.08 KJ of heat were absorbed by the reaction.

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Metals can be distinguished by dissolving them in fuel and them burning that fuel. For example, calcium will turn orange and copper will turn green. Is this because of blackbody radiation or atomic transitions that you see in line spectra?

Answers

This is because, of the black body raiditon that’s you see in the line spectra

Copper will turn green and calcium will turn orange.  this is as a result of the atomic transitions visible in line spectra

What components make up transitions?

Transition elements are substances with partially filled d orbitals, sometimes referred to as transition metals. According to IUPAC, a transition element is an element with a partially filled d subshell or one with the capacity to create stable cations that has an unfilled d orbital.

Why are transitional elements called that?

As a result of their transitional behavior between s-block or p-block elements, the d-block elements are referred to as transition elements. Their characteristics are intermediate between those of the covalently-bonded, highly reactive s-block metallic elements and those of the p-block elements.

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determine the degree of ionization at pH 2.0​

Answers

Answer:

answer in the picture above

An atom with more electrons than protons has an overall positive charge and is called a
positive ion

Answers

That is correct! It is a positive ion!

(a)Determine the number of KNO3 molecules in 0.750 mol KNO3.
(b) What is the mass (in milligrams) of 2.39 x 1020 molecules of Ag2SO4.
(c) Estimate the number of NaHCO2 molecules in 3.429 g of NaHCO2.

Answers

A. The number of molecules in 0.750 mole of KNO₃ is 4.515×10²³ molecules

B. The mass (in milligrams) of 2.39×10²⁰ molecules of Ag₂SO₄ is 124 mg

C. The number of molecules in 3.429 g of NaHCO₂ is 3.04×10²² molecules

Avogadro's hypothesis

1 mole of substance = 6.02×10²³ molecules

A. How to determine the number of molecules

1 mole of KNO₃ = 6.02×10²³ molecules

Therefore,

0.750 mole of KNO₃ = 0.75 × 6.02×10²³

0.750 mole of KNO₃ = 4.515×10²³ molecules

B. How to determine the mass of Ag₂SO₄

6.02×10²³ molecules = 312 g of Ag₂SO₄

Therefore,

2.39×10²⁰ molecules = (2.39×10²⁰ × 312) / 6.02×10²³

2.39×10²⁰ molecules = 0.124 g

Multiply by 1000 to express in mg

2.39×10²⁰ molecules = 0.124 g × 1000

2.39×10²⁰ molecules = 124 mg of Ag₂SO₄

C. How to determine the number of molecules

68 g of NaHCO₂ = 6.02×10²³ molecules

Therefore,

3.429 g of NaHCO₂ = (3.429 × 6.02×10²³) / 68

3.429 g of NaHCO₂ = 3.04×10²² molecules

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Select the correct answer.
Iron oxide reacts with aluminum to give aluminum oxide and iron. What kind of chemical reaction is this?

Answers

Answer:

Single-replacement reaction

Explanation:

Single-replacement reactions, aka. single-displacement reactions, involve one element/ion in a compound being replaced by another element/ion. In this case, aluminum is replacing the iron in the compound.

If you need help visualizing, the equation looks like this:

FeO + Al³⁺ --> AlO + Fe³⁺

220 mL of oxygen gas was collected over water. The total pressure of oxygen plus water vapor was 745.8 mmHg at 25.0°C. What is the pressure, in mmHg, exerted by only the oxygen gas?

Answers

Since 220 mL of oxygen gas was collected over water, the pressure exerted by only the oxygen gas is 720.8 mmHg

Pressure of gas collected over water

The total pressure of a gas collected over water is given by P = P' + p where

P = pressure of oxygen gas and p = vapour pressure of water at 25 °C = 25 mmHg

Making P' subject of the formula, we have

P' = P - p

Since the total pressure of oxygen plus water vapor is P = 745.8 mmHg, substituting the values of the variables into the equation, we have

P' = P - p

P' = 745.8 mmHg - 25 mmHg

P' = 720.8 mmHg

So, Since 220 mL of oxygen gas was collected over water, the pressure exerted by only the oxygen gas is 720.8 mmHg

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.
Which is not a property of magnets?

AThey point north when allowed to swing freely on a string.
B They attract or repel other magnets.
C Their force of attraction is strongest in the middle of the magnet.
D They attract iron and other materials containing iron.

Answers

Explanation:

Their force of attraction is strongest in the middle of the magnet.

The right option is C their force is not at its peak in the middle of the magnet

Describe how distillation process makes water soft​

Answers

Answer:

Distillation can be used to separate and collect a liquid from a solution. Distillation can also be used to soften water as the water evaporates as it is heated and the ions are left behind. Hard water can be softened by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.

Explanation:

Determine whether or not the mixing of each of the two solutions indicated below will result in a buffer.
Drag the appropriate items to their respective bins.

Answers

Sinve CH3NH2 is weak base and its salt is CH3NH3Cl, mixing 125.0 mL of CH3NH2 and 120.0 mL of CH3NH3Cl so produce a buffer.

What is a buffer?

A buffer is a solution which resists changes to its pH when a small quantity of strong acid or base is added to it..

A buffer is made from a weak acid and its salt or a weak base and its salt.

From the given options, CH3NH2 is weak base and its salt is CH3NH3Cl.

Therefore, mixing 125.0 mL of CH3NH2 and 120.0 mL of CH3NH3Cl so produce a buffer.

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two or more substances combine to form a single new substance

Answers

Answer:

Combination reactions

Explanation:

Hope this helps:)

Find the empirical formula of a compound that contains 34.97 g of Fe and 15.03 g of O.​

Answers

A sample of the black mineral hematite (Figure 2), an oxide of iron found in many iron ores, contains 34.97 g of iron and 15.03 g of oxygen. What is the empirical formula of hematite? The empirical formula is Fe2O3.

A 20 g gold coin is heated from 10°C to 50°C ( CAu is 0.13 J/g−°C ). What is the △H ? (Hint: Remember ΔH=q, so if you solve for q, you might have your answer!)

Answers

Mass=m=20g∆T=50-10=40°CSpecific heat=c=0.13J/g°C

Now

[tex]\\ \rm\rightarrowtail Q=mc\delta T[/tex]

[tex]\\ \rm\rightarrowtail Q=20(40)(0.13)[/tex]

[tex]\\ \rm\rightarrowtail Q=800(0.13)[/tex]

[tex]\\ \rm\rightarrowtail Q=104J[/tex]

0.75 mol hydrogen sulfide (H2S)

Answers

Answer:

• Information and media literacy

Directions

Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write

brief evaluation of your work.

Activity

Part A

Now that you have analyzed the resources provided in the lesson, write your own response to the question, What is the main reason the US Civil

War started? Base your

Explanation:

• Information and media literacy

Directions

Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write

brief evaluation of your work.

Activity

Part A

Now that you have analyzed the resources provided in the lesson, write your own response to the question, What is the main reason the US Civil

War started? Base your

Answer: =378.94000053g

Explanation:

I think that explains it

Which of the following is a nonmetal?
A.
potassium (K)
B.
aluminum (Al)
C.
calcium (Ca)
D.
chlorine (Cl)

Answers

D. chlorine (Cl)

Chlorine is a nonmetal. Chlorine is a halogen in family VIIA, which is on the right side of the metalloids on the periodic table.

buffer is prepared by adding 275 mL of .676M of HCl to 500 mL of .525M sodium acetate. What is the pH?

Answers

The pH of the buffer prepared by adding 275 mL of .676M of HCl to 500 mL of .525M sodium acetate is 6.45.

How to calculate pH?

The pH of a buffer solution can be calculated by initially calculating the millimoles of both the conjugate base and acid.

Millimoles of hydrochloric acid = 275mL × 0.676M = 185.9millimolesMillimoles of sodium acetate = 500mL × 0.525M = 262.5millimoles

From, Henderson Hasselbalch equation,

pH = pKa + log conjugate base/acid

pka of HCl = -6.3

-6.3 + log 262.5/185.9

6.3 + 0.15

pH = 6.45

Therefore, the pH of the buffer prepared by adding 275 mL of .676M of HCl to 500 mL of .525M sodium acetate is 6.45.

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If the pH is 6.1,what is the concentration of H^+?

Answers

Hi!

[tex]\\ \sf\rightarrow pH=-log[H^+][/tex]

[tex]\\ \sf\rightarrow -log[H^+]=6.1[/tex]

[tex]\\ \sf\rightarrow log[H^+]=-6.1[/tex]

[tex]\\ \sf\rightarrow [H^+]=10^{-6.1}[/tex]

[tex]\\ \sf\rightarrow [H^+]=7.94M[/tex]

Calculate the (H3O+) for a solution whose pH is 6.79



Note: blank 1 should have three significant figures



The answer is: Blank 1 X 10^Blank 2

Answers

Answer:

Explanation:

alculate the (H3O+) for a solution whose pH is 6.79

Note: blank 1 should have three significant figures

The answer is: Blank 1 X 10^Blank 2

The pH of a solution is the negative logarithm of H₃O⁺ ion concentration.The concentration of H₃O⁺ ions in a solution with a pH of 6.79 is 1.6 × 10⁻⁷M.

What is pH ?

pH of a solution is the measure of its acidity or basicity. Mathematically it is the negative logarithm of its  H₃O⁺ ion concentration. A solution with a pH of 7 is neutral.

The solution with a pH below 7 is acidic and above 7 is basic. Thus, the higher H+ ion concentration, then the pH will be lower and more acidic the solution.

It is given that the pH of the solution is 6.79. The concentration of  H₃O⁺ ions in the solution is calculated is calculated as follows:

pH   = -log ( H₃O⁺)

6.79 = -log( H₃O⁺

[ H₃O⁺] = antilog (-6.79)

             =  1.6 × 10⁻⁷M

Hence, the  hydronium ion H₃O⁺ ion concentration of the solution of pH 6.79 is  1.6 × 10⁻⁷M.

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Which elements most easily give up electrons?
A.Oxygen, hydrogen, lithium
B.Copper, gold, silver
C.Copper, oxygen, silver
D.Silver, iodine, helium

Answers

I think it’s a) because they have an extra electron in comparison to other elements and can easily give up their electrons.

please help!!!

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?
3
4
2
1

Answers

Answer:

Sulfur (S) has 3 shells.

Explanation:

The first shell can have up to 2 electrons. The second and third shells have up to 8 electrons as well. This makes the maximum of each shell to be 2, 10, and 18. Sulfur has 16 electrons so it has more than the second shell but less than the third shell. So, it will have 3 shells with a valence of 2 since it is missing 2 electrons to create a full shell.

Remove all the tape pieces from part A, and throw them in the trash. Next, follow these steps to compare pieces of sticky tape that have different charges:
Tear off two pieces of tape that are about 15 cm (6 inches) long. Similar to part A, fold under a half inch of each piece to make the strips easier to pull off.
Stick one of the pieces onto the tabletop. Smooth the tape down.
Stick the second piece of tape onto the tape piece you just placed. Do not cover the tab of the first piece of tape.
Grasp one tape tab in each hand. Carefully pull both pieces off the table and separate them. Turn the non-sticky sides of the tape toward each other.
What do you observe? If there’s an interaction, explain whether the tape pieces attract or repel each other. (ANSWER ASAP)

Answers

The interaction which will occur when the non sticky tape pieces are turned towards each other is attraction.

What is Attraction?

This involves the coming together of objects as a result of a force. When non-sticky sides of the tape are brought towards each other attraction takes place due to the sticky content.

This however wears off after some time thereby making it the most appropriate choice.

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Kevin and Lisa get into a deep discussion. Kevin believes adding HOT WATER to a test tube that has baking soda will cause the substances to react faster. Lisa, thinks he is wrong and believes that the HOT WATER may cause the substances to not react normally. Based on what you learned from the QUIZZIZZ ACTIVITY, whose side would you take in this argument????

Answers

I agree with idea of Kevin because bakong soda dissociates faster in hot water than cold water.

How baking soda reactivity increase in hot water?

Baking soda is a chemical that can undergo a decomposition reaction when heated. At 80 degrees Celsius, sodium bicarbonate starts to break down into sodium carbonate (Na2CO3), water (H2O) and carbon dioxide (CO2) which is ready for reaction with other chemical.

So we can conclude that Kevin idea is correct because bakong soda dissociates faster in hot water than cold water.

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