Farsighted people have trouble seeing objects that are close to their eyes.
True
False

Answers

Answer 1
True, while nearsightedness, is one of the most common eyesight problems. People with this condition can't focus their eyesight on far-away objects, making them appear blurry. Farsighted is when people cannot see objects that are up close.

Related Questions

Practice Problem 12.39 Partially correct answer. Your answer is partially correct. Try again. Acid-catalyzed hydration of 1-methylcyclohexene yields two alcohols. The major product does not undergo oxidation, while the minor product will undergo oxidation because the major product is Entry field with incorrect answer 2-methylcyclohexanol , which is a Entry field with incorrect answer secondary alcohol. These alcohols do not generally undergo oxidation. The minor product (Entry field with incorrect answer 1-methylcyclohexan-2-ol ) is asecondary alcohol and can undergo oxidation to yield a(n)

Answers

Answer:

See explanation and image attached

Explanation:

The acid-catalyzed hydration of 1-methylcyclohexene proceeds by an SN1 mechanism. The reaction involves the formation of carbocations.

Two carbocations are formed leading to the major and minor products. The major product is obtained from the tertiary (more stable) carbocation while the minor product is obtained from the secondary (less stable carbocation).

Tertiary alcohols are not oxidized, hence the major product does not undergo oxidation. However, secondary alcohols are oxidized to ketones.

How much of NaCl is in 1.14 L of 0.400 M
NaCl?

Answers

Answer:

44 g NaCI

Explanation:

The problem provides you with the molarity and volume of the target solution, so your first step here will be to use this information to figure out how many moles of sodium chloride.

Please help 3. The combustion of glucose is represented by the following balanced equation: C6H12O6 + 602 - 6H20 + 6CO2.
Which reactant is the limiting reagent if there is 1 gram of both C6H12O6 and O2? (Hint: Must convert to moles to determine this.)
O a C.H 20
O bO2
O c H₂O
Od CO₂

Answers

Answer:

Explanation:

C₆H₁₂O₆       +      60₂     =     6H₂0     +     6CO₂.

1 mole              6 mole

molecular weight of C₆H₁₂O₆ = 180 g

molecular weight of oxygen = 32 g

1 gram of glucose = 1 / 180 = 5.55 x 10⁻³ moles

1 gram of oxygen = 1 / 32 = 31.25 x 10⁻³ moles

1 mole of glucose reacts with 6 moles of oxygen

5.55 x 10⁻³ moles of glucose will react with 6 x 5.55 x 10⁻³ moles of oxygen

= 33.30 x 10⁻³ moles of oxygen .

But oxygen available = 31.25 x 10⁻³ moles

So available oxygen is less than required .

Hence oxygen is the limiting reagent .

b ) is the right option .

When a soda is poured into a glass and the soda bubbles, is it the result of a chemical change? Explain your answer.

Answers

yep b/c bubbles and fizzing are a couple of characteristics of a chemical change

Need help fast help help help. Help

Answers

Answer:

fjnjfzgnf

Explanation:

Answer:

it blank !

Explanation:

P4 +502 — P4010

What is the limiting reactant if you are using 25.0 grams of phosphorus and 50.0 grams of oxygen?


A.) O2


B.) P4


C.) P4O10


D.) P4O2

Answers

Answer:

B.) P4

Explanation:

Step 1: Convert 25.0 grams of phosphorus into moles of phosphorous:

25 g P4 x 1 mol P4/123.90 g P4 = 0.202 mol P4

Step 2: Convert 0.202 mol P4 into moles of O2 using their stoichiometric ratios:

0.202 mol P4 x 5 mol O2/1 mol P4 = 1.01 mol O2

Step 3: Convert 1.01 mol O2 into grams of O2:

1.01 mol O2 x 31.98 g O2/1 mol O2 = 32.3 g O2

Because 25.0 grams of phosphorous only needs 32.3 grams of oxygen to react, phosphorous will be the limiting reactant, as after the 25.0 grams of phosphorous is used up, there will still be 17.7 grams of oxygen leftover (excess reactant).

Because the reaction cannot occur without more phosphorous to react with the 17.7 grams of oxygen remaining, P4 is the limiting reactant.

Answer:  B.) P4

Explanation:

Step 1: Convert 25.0 grams of phosphorus into moles of phosphorous:

        25 g P4 x 1 mol P4/123.90 g P4 = 0.202 mol P4

Step 2: Convert 0.202 mol P4 into moles of O2 using their stoichiometric ratios:

        0.202 mol P4 x 5 mol O2/1 mol P4 = 1.01 mol O2

Step 3: Convert 1.01 mol O2 into grams of O2:

        1.01 mol O2 x 31.98 g O2/1 mol O2 = 32.3 g O2

Because 25.0 grams of phosphorous only needs 32.3 grams of oxygen to react, phosphorous will be the limiting reactant, as after the 25.0 grams of phosphorous is used up, there will still be 17.7 grams of oxygen leftover (excess reactant).

Because the reaction cannot occur without more phosphorous to react with the 17.7 grams of oxygen remaining, P4 is the limiting reactant.

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A balloon full of air has a volume of 1.00L at a temperature of 23 °C. What is the balloon's volume at 33°C?
Answer:1.03L
How do I solve this?

Answers

Answer:

V2= 1.03L

Explanation:

Start off with what you are given.

V^1: 1.00L

T^1: 23°C

V^2?

T^2: 33°C

If you know your gas laws, you have to utilise a certain gas law called Charles' Law:

V^1/T^1 = V^2/T^2

Remember to convert Celsius values to Kelvin whenever you are dealing with gas problems. This can be done by adding 273 to whatever value in Celsius you have.

(23+273 = 296)     (33+273 = 306)

Multiply crisscross

1.00/296= V^2/306

296V^2 = 306

Dividing both sides by 296 to isolate V2, we get

306/296 = 1.0337837837837837837837837837838

V2= 1.03L



A sample of a compound was found that has 40.25g of (C) Carbon and 59.75g of (O) Oxygen.

What is the empirical formula for this sample.

Answers

Answer:

CO

Explanation:

From the question given above, the following data were obtained:

Mass of Carbon (C) = 40.25 g

Mass of oxygen (O) = 59.75 g

Empirical formula =?

The empirical formula of the compound can be obtained as follow:

C = 40.25 g

O = 59.75 g

Divide by their molar mass

C = 40.25 / 12 = 3.354

O = 59.75 / 16 = 3.734

Divide by the smallest

C = 3.354 / 3.354 = 1

O = 3.734 / 3.354 = 1

The empirical formula of the compound is CO

Write the formulas for the reactants and products. Balance the chemical equation.

Combination/Synthesis Reaction:

Sodium + Oxygen —>

Answers

Explanation:

2Na+O2=2N2Ois balanced one

A relationship in which one variable increases as the other variable decreases is an inverse relationship.
CA. True
B. False

Answers

Answer:

TRUE

Explanation:

HOPE IT WILL HELP YOU

there is 6.4% sales tax on 1,500 television how much tax is owned

Answers

Answer:

What you need to know before I explain is how to add percents onto numbers.  What I'm saying is what and how to do 6.4% x 1500

1. You can't do a percent and number together, that's impossible

What you can do is convert the percent (6.4%) into a decimal

2. 6.4% is equivalent to 6.4/100, which is equivalent to 0.064

3.  Now, you multiply 0.064 x 1500

You will notice, hopefully, that you have a number smaller than 1500, but do not panic, you are on the right track!

4. Using the number you got, add that to 1500, and there's your total!

But, if you want only the tax, keep that small number you started off with!

Explanation:

An aqueous solution of sodium chloride, NaCl has a mol fraction of 0.15. calculat the molality of NaCl​

Answers

Answer:

8.8mol/l

Explanation:

but I'm not percent sure.

8.8 u r welcome
Llllllll

read carefully and do this questions all part all questions if someone do this questions I will make you brainly and give you thanks.

Answers

Answer:

2a. Calcium chloride

2b.hydrochloride acid

2c. water molecules

2d.hydrochloric acid

2e.carbon dioxide

Explanation:

CaCO3+2HCl=CaCl2+CO2+H2O

Are the gas laws affected depending on whether you use heavy gas particles or light gas particles? If anything, what is affected by the size of the molecule?

Answers

Answer:

yes

Explanation:

Yes, size of molecule has greatly affected the gas law.

The gas laws affected depending on whether we use heavy gas particles or light gas particles because the heavy gas particles can't move faster as light gas particles with the increase of temperature.

If the temperature is increased, the gas particles move faster due to absorb of heat energy so they hit the walls of the container. This causes the pressure to rise. The pressure of a gas also increases when the volume of container in which it is placed is decreased. Bigger the molecule size, the stronger the intermolecular forces, so the molecule has higher melting and boiling points so we can conclude that big size molecule greatly affected the gas law.

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PLEASE HELP!!

How many moles are contained in 7.88 x 10^24 atoms of Iron?

Answers

Answer:

Explanation:

9.55 mol of Al

Explanation:

To obtain the number of moles of a certain element given the number of atoms only, you have to divide it with Avogadro's number,  

Answer:  mutiply them

Explanation:

what is the expirement

Answers

Answer:

A Experiment is an operation or procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law

Explanation:

Brainliest pls

What is the primary function of the chromosome?

Answers

Answer:

Store the genetic instructions needed to specify traits.

In DNA, the primary function of chromosome is store the genetic instructions needed to specify traits.

What is DNA?

DNA is a hereditary material  which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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Explain why anhydrous aluminium chloride is fairly soluble in organic solvent while anhydrous magnesium chloride is insoluble​

Answers

Answer:

The correct answer is - anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.

Explanation:

Anhydrous aluminum chloride is a covalent compound and we know that covalent compounds have less or no polarity. Organic compounds or solvents are mostly non-polar in nature. And it is a thumb rule that like-dissolves-like.

Thus they dissolve covalent molecules like anhydrous aluminum chloride.

Anhydrous magnesium chloride is an ionic compound that tends to interact with a polar solvent but not in a non-polar solvent such as organic solvents.

Anhydrous aluminum chloride is fairly soluble in the organic solvent while anhydrous magnesium chloride is insoluble​ because anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.

Why is AlCl3 soluble in organic solvent?

AlCl3 quite simply accepts electrons from other atoms, in an try and get a full valence shell of eight electrons. It's why it normally behaves as a Lewis acid. In the response under, the Al atom accepts a lone pair of electrons from a Cl atom.

Why is AlCl3 soluble in water?

AlCl3 is hygroscopic and has a great affinity for water. Therefore, aluminum chloride dissolves in water partially.

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What can nonmetals be used to make, please talk about the physical properties of nonmetals.

Answers

Answer:

nonmtals:

Uses of nonmetals in our daily life: Oxygen which is 21% by volume helps in the respiration process. It is also used for manufacturing of steel and provides high temperature in metal fabrication process. ...

Nonmetals used in fertilizers: Fertilizers contain nitrogen. It helps in plant growth. ...

Nonmetals used in crackers

Non-Malleable and Ductile: Non-metals are very brittle, and cannot be rolled into wires or pounded into sheets. Conduction: They are poor conductors of heat and electricity. Seven non-metals exist under standard conditions as diatomic molecules: H2(g)

Explanation:

Can someone help me please

Answers

Answer:

the answers are a, f, g

and lastly e because they all describe a liquid

An element X has a triiodide with the empirical formula XI3 and a trichloride with the empirical formula XCl3. The triiodide is converted to the trichloride according to the equation XI3 Cl2XCl3 I2 If the complete conversion of 1.196 g of XI3 results in the formation of 0.436 g of XCl3, what is the atomic mass of the element X

Answers

Answer:

51.03g/mol is the molar mass of X

Explanation:

Based on the reaction:

2XI₃ + 3Cl₂X → 2XCl₃ + 3I₂

Where 2 moles of XI₃ reacts to produce 2 moles of XCl₃ -The ratio of reaction is 1:1-

To solve this question we must find the mass of X per mole (This is the atomic mass of X).

As the moles of both compounds are the same:

1.196g / 0.436g = Molar mass XI₃ / molar mass XCl₃ (1)

Also:

Molar mass XI₃ = Molar mass X + 380.71g/mol

Molar mass XCl₃ = Molar mass X + 106.36g/mol

Replacing in (1):

2.7431 = (Molar mass X + 380.71g/mol) / (Molar mass X + 106.36g/mol)

2.7431 Molar mass X + 291.76g/mol = Molar mass X + 380.71g/mol

1.7431 Molar mass X = 88.95g/mol

Molar mass X = 51.03g/mol

51.03g/mol is the molar mass of X

According to the quantum-mechanical model for the hydrogen atom, which electron transition produces light with the longer wavelength: 3p + 2s or 4p + 3p? Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help increases As the n level increases, the energy and thus the levels are each 3p → 2s other. Therefore, the transition would have a greater energy difference than the transition from inversely decreases Energy and wavelength are proportional, so the transition would farther from produce a longer wavelength. 4p + 3p directly closer to

Answers

Answer:

Explanation:

The main task here is that there are some missing gaps in the above question that needs to be filled with the appropriate answers. So, we are just going to do rewrite the answer below as we indicate the missing gaps by underlining them and making them in bold format.

SO; In the quantum-mechanical model of the hydrogen atom.

As the n level increases. the energy increases and thus levels are closer to each other. Therefore, the transition 3p→2s would have a greater energy difference than the transition from 4p→3p.

[tex]Energy \ and \ wavelength \ are \ inversely \ proportional , \ so \ the \ \mathbf{ 4p\to 3p} \ transition \ would[/tex][tex]produce \ a \ longer \ wavelength.[/tex]

An unknown hydrocarbon reacts with oxygen to produce carbon dioxide and water. The number of oxygen molecules in the reactants is the same as the number of hydrocarbon molecules. What are the two possibilities for the molecular formula of the hydrocarbon?

Answers

Explanation:

Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat. Hydrocarbons are molecules consisting of both hydrogen and carbon. They are most famous for being the primary constituent of fossil fuels, namely natural gas, petroleum, and coal. For this reason, fossil fuel resources are often referred to as hydrocarbon resources.[1] Energy is obtained from fossil fuels through combustion (burning) of the fuel. Although impurities exist in fossil fuels, hydrocarbon combustion is the primary process in the burning of fossil fuel.

How many moles are in 8.30 X 1023 molecules of H2O? with the step

Answers

Answer:

Answer: 1.38 moles

Explanation: According to Avogadro's law, 1 mole of every substance contains Avogadro number of particles (atoms, molecules or ions) i.e.6.023*10^23  particles.

Given : 1 mole molecule of water contains 6.023*10^23 molecules of water.

6.023*10^23  molecules are present in = 1 mole

 8.30*10^23molecules will be present in =

1/6.023*10^23 ×8.30*10^23=1.38 moles

Thus  molecules is equal to 1.38 moles.

PLEASE MARK ME BRAINLIEST

Which of the following are more likely to form a solution? (select all that apply)

A) When both solute and solvent are polar
B) When both solute and solvent are nonpolar
C) When solute is polar and solvent is nonpolar
D) When solute is nonpolar and solvent is polar

Answers

Answer:A and B

Explanation:

A substance is said to be polar when it is having a dipole (a delocalised positive and negative charge) or it is ionic (dissociate into ions when dissolved in water)

HELP ASAP!!!!!!!!!!
What is sous-vide?


A food stabilizer

B liquid food that chefs make into a spherical shape

C food that chefs quickly freeze using liquid nitrogen

D food that chefs seal in a plastic bag and cook under controlled temperature conditions

Answers

Answer:

D) food that a chef seal in a plastic bag and cook under a controlled temperature condition.

Explanation:

Sous vide, also known as low temperature long time cooking, is a method of cooking in which food is placed in a plastic pouch or a glass jar and cooked in a water bath for longer than usual cooking times at a precisely regulated temperature. 

molecular formula of CH3-CH2-CH2-CH2-CH2-Cl​

Answers

Answer:

C₅H₁₁Cl

Explanation:

Count all the carbon, hydrogen, and chlorine atoms. The number of atoms of each element is the subscript for each element in the formula. No subscript is understood to be one. Carbon goes first, hydrogen goes second, and chlorine goes last when writing the formula.

A car travelling
at 35 m/s has a
kinetic energy
of 500,000 J.
what is the
mass?

I NEED HELP FIGURING THIS OUT

Answers

Answer:

816.33 kg

Explanation:

To solve this problem we'll need to keep in mind the formula for the kinetic energy of an object:

E = 0.5 * m * v²

Where E is the kinetic energy, m is the object's mass and v its velocity.

We input the data given by the problem:

500000 J = 0.5 * m * (35 m/s)²

And solve for m:

m = 816.33 kg

what is the effect of heat and light on chemical reaction​

Answers

Answer:

Exothermic reactions release heat and light into their surroundings. For example, combustion reactions are usually exothermic. In exothermic reactions, the products have less enthalpy than the reactants, and as a result, an exothermic reaction is said to have a negative enthalpy of reaction.

Answer:

Is it fire onn a bottle?

Explanation:

Because I thought that if you shine light ona ANYTHING plastic, the chemical reaction is a little fire.

what organelle acts as a barrier of the cell? ​

Answers

Answer:

cell membrane

Explanation:

it controls what comes and goes out of a cell

Answer:

Cell membrane

Explanation:

It separates the interior of all cells from the outside environment (the extracellular space) which protects the cell from its environment.

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