(b) 28.2 yd to centimeters

Answers

Answer 1

Answer:

2578.608 centimeters in 28.2 yards.

Explanation:

There are 91.44 centimeters to a yard. Multiplying 91.44 by the number of yards, we get the number of centimeters per yards.

91.44(28.2) = 2578.608

Answer 2

Answer:

hruejhehee7 suhdbdudud d d

Explanation:

jejeij3j3n3jeij


Related Questions

6.900x10^10 ÷ 4.000x10^8

Answers

Answer:

1.725e+18

Explanation:

What is the volume of 4.78g of O2 gas at STP?

Answers

Answer:

Explanation:

The trick here is to realize that if you know the volume of a gas at STP, you can use the fact that

1

mole of any ideal gas occupies

22.7 L

under STP conditions to calculate how many moles of gas you have in your sample.

Under STP conditions:

1 mole of an ideal gas = 22.7 L

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

In your case, you know that your sample of gas occupies

2.28 L

under STP conditions, which are currently defined as a pressure of

100 kPa

and a temperature of

0

C

.

This means that your sample will contain

2.28

L

molar volume of a gas at STP



1 mole gas

22.7

L

=

0.10044 moles gas

Now, the molar mass of the gas is the mass of exactly

1

mole of the gas. In your case, you know that you get

3.78 g

for every

0.10044

moles, which means that you have

1

mole

3.78 g

0.10044

moles

=

37.6 g

Since this is the mass of

1

mole of gas, you can say that the molar mass of the gas is

molar mass = 37.6 g mol

1

−−−−−−−−−−−−−−−−−−−−−−−

i’m not surreeeeeeeeeee

Write your explanation on how plants
nake their own food?
imnortont bynroduct of

Answers

Answer:

photosynthesis  are ligt water and carbon dioxide

Explanation:

Plants make their own food out of inorganic compounds through a process called photosynthesis that takes place in the leaves. The ingredients necessary for photosynthesis are light, water and carbon dioxide.

Oxygen gas is at a temperature of 145 K when it occupies a volume of
1.45 Liters. To what temperature should it be raised to occupy a volume of 6.50
Liters? Show your work. (Express your answer in Kelvin)

Answers

Answer:650K

Explanation:

Answer: 650K (1.45/145 = 6.50/x)

Explanation:

Which of the following is true for an excess reactant?

A) It is the reactant whose atoms remain unbalanced in the equation.
B) It is the reactant that produces a smaller amount of a product.
C) It is the reactant that is left over after the reaction stops.
D) It is the reactant that produces one mole of a product.

Answers

Answer:

C) It is the reactant that is left over after the reaction stops.

Explanation:

The excess reactant is the reactant that is left over after the reaction stops. The extent of the reaction is not determined by this reactant.

A limiting reactant is a reactant that is in short supply within a given reaction.

Such reactants determines the extent of chemical reaction.

Limiting reactants are used up in a chemical reaction. The excess reactants remains unchanged after the reaction.

Answer: C) It is the reactant that is left over after the reaction stops.

Explanation:

PLZ HELP ME IM FAILING!

Everything you need to know about the question is on the photo

Answers

Answer:

C. NH₄Cl

Explanation:

The compound with the element ratio 1 : 4 : 1 from the given choices is NH₄Cl.

An element is a pure substance made up of distinct number of atoms. Elements are unique and are different from other elements because of the nature of their atoms.

We often delineate an element using chemical symbols.

   In the compound NH₄Cl;

There are 3 elements:

           Number of atoms

N                      1

H                      4

Cl                     1

Which of the following is a mechanical wave?
a
An X-ray taking photos of your bones with X-rays
b Ocean waves crashing on the shore
CUV rays giving you a sunburn
d A microwave oven heating food with microwaves
e
Radios picking up radio waves

Answers

Answer:

I think A and D and E

Explanation:

that is an example of mechanical wave

The best way to separate sesame seeds from salt solution is _____

1 :Filtration
2:Osmosis
3 :Distillation
4 : evaporation​

Answers

Answer:

Filtration is the answer

900 mL of water is added to 100 mL of a 0.1 M solution. What is the new concentration?
0.1M
0.001M
0.0001M
0.01M

Answers

Answer:

The new concentration of the solution is;

0.01 M

Explanation:

The question relates to concentration of solution and proportion of mixtures

The given parameters are;

The volume of water added to the 0.1 M solution = 900 mL

The initial volume of the solution to which water was added = 100 mL

Therefore, the total final volume of the solution = 100 mL + 900 mL = 1000 mL = 1 L

The concentration of the solution = 0.1 M

The number of moles present in the solution, 'n', is given as follows;

n = 100 mL/(1000 mL) × 0.1 M = 0.01 moles

Given that no more concentrated solution was added, we have;

The number of moles in the 100 mL solution   = The number of moles in the 1,000 mL solution

Therefore, the number of moles in the 1,000 mL (1 L) solution = 0.01 moles

Therefore;

The new concentration of the 1,000 mL (1 L) solution = 0.01 moles/(1,000 mL) = 0.01 moles/(1 L) = 0.01 M (By definition of the molarity of a solution)

The new concentration of the 1,000 mL (1 L) solution = 0.01 M.

D. 0.01 M

Given:

The volume of water added to the 0.1 M solution = 900 mL

The initial volume of the solution to which water was added = 100 mL

So,

The total final volume of the solution = 100 mL + 900 mL = 1000 mL = 1 L

The concentration of the solution = 0.1 M

Firstly we need to find the number of moles which is represented by 'n':

 [tex]n = \frac{100mL}{1000mL}* 0.1 M\\\\n = 0.01 \text{moles}[/tex]

 The number of moles in the 100 mL solution   = The number of moles in the 1,000 mL solution

Thus,

The number of moles in the 1,000 mL (1 L) solution = 0.01 moles  

For calculation of new concentration:

Using Molarity formula:

The new concentration of the 1,000 mL (1 L) solution [tex]= \frac{0.01\text{ moles}}{1000mL} = \frac{0.01\text{ moles}}{1L} = 0.01 M[/tex]

The new concentration of the 1,000 mL (1 L) solution = 0.01 M.

Thus, the correct option is D.

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5.4 g of Aluminium reacts with 300 mL of 0.2 mol/L hydrochloric acid solution. a. Write equation for the reaction taking place. b. Specify which reactant is limiting and which reactant is excess. c. Find volume of the gas collected at S.T.P d. How many grams of salt are produced at the end of the reaction? e. How many grams of the excess reactant are left ate the end of the reaction? Given: Al=27 , H=1 , Cl=35.5

Answers

HCl as a limiting reactant

volume of the gas(H₂)= 0.672 L

mass of salt : =2.67 g

mass of excess left :  4.86 g

Further explanation

Given

5.4 g Al

300 mL of 0.2 mol/L HCl

Required

limitng reactants

volume of the gas(H₂)

mass of salt

mass of excess left

Solution

Limiting reacttant

Reaction

2Al + 6HCl → 2AlCl₃ + 3H₂

mol Al = 5.4 g : 27 g/mol = 0.2

mol HCl = 0.3 L x 0.2 mol/L = 0.06

mol : coefficient of reactants :

Al = 0.2 : 2 = 0.1

HCl = 0.06 : 6 = 0.01

HCl as a limiting reactant(smaller ratio)

Al as an excess reactant

volume of H₂

mol H₂ = 3/6 x mol HCl = 3/6 x 0.06 = 0.03

volume (STP : 1 mol=22.4 L) :

= 0.03 x 22.4 L

= 0.672 L

mass of salt(AlCl₃)

mol AlCl₃ = 2/6 x mol HCl = 2/6 x 0.06 = 0.02

mass AlCl₃ :

= mol x MW

= 0.02 x 133.5

=2.67 g

mass of excess(Al) left

mol (reacted) : 2/6 x mol HCl = 2/6 x 0.06 = 0.02

mol (unreacted) : 0.2 - 0.02 = 0.18

mass = 0.18 x 27 g/mol = 4.86 g

You eat a snack that has 190 Calories, how many kilojoules did you consume? PLEAS HELP ME I need the work too pls

Answers

Answer:

794.96 kilojoules

Explanation:

multiply 190 by 4.184

There are 0.798 kilojoules an individual must consume when he/she takes a snack that has 190 Calories.

What is one Calorie?

One calorie may be defined as a unit for measuring heat wjhich is equivalent to the amount of heat required to increase the temperature of one gram of water one degree Celsius.

According to the question,

The amount of calories a snack contains = 190 calories

Now, you should be required to convert calories into Joules.

1 calorie ≅ 4.2 Joules.

190 calories = 190 × 4.2 = 798 Joules.

Now, according to the conversion factor, 1 kilojoule = 1000 joules

798 Joules = 798/1000 = 0.798 kilojoules.

Therefore, there are 0.798 kilojoules an individual must consume when he/she takes a snack that has 190 Calories.

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Mixtures can be separated by physical processes.
A sequence of physical processes can be used to separate common salt (sodium chloride)
from a mixture containing sand and common salt only.
Give the order and the correct scientific term for the physical processes used to separate the
common salt from the mixture.

Answers

don't know sorry.........

Scientists often look at how much isotopes of ______
have decayed to help estimate the age
of a fossil or once-living material.

Answers

Answer:

If im correct it’s radioisotope

Explanation:

Scientists often look at how much of isotopes of : Carbon-14  have decayed

To determine the age of fossils archeologist make use of the carbon-14 dating ( i.e. making use of naturally occurring radioisotope ¹⁴C ) which is used to determine the age of fossils or material that were once in living on earth.

Carbon has about three (3) isotopes ( Carbon-12, Carbon-13 and Carbon-14 ) .but Carbon-14 isotope is most useful in determining the age of fossils and once-living things

Hence we can conclude that scientists often look at how much of isotopes of Carbon-14 have decayed to help estimate the age of fossils.

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What does the pH of a solution represent?


A. The pH represents the partial pressure of hydrogen gas.


B. The pH tells how quickly a reaction reaches equilibrium.


C. The pH indicates how acidic or basic a solution is.


D. The pH is an indicator of the salt content of a solution.

Answers

Answer:

The pH indicates how acidic or basic a solution is.

Explanation:

i just took the test and got it right.

pH of a solution is the measure of how acidic or basic the solution is. It is determined based on the H+ ion concentration in the solution. Hence, option C is correct.

What is pH?

pH of a solution is the measure of the H+ ion concentration in a solution. It determines the acidity or basicity of the solution. Mathematically it is the negative logarithm of H+ ions concentration.

pH = - log [H+]

A pH scale can be used to determine the acidity or basicity of a solution. If the basicity is 7, then the solution is neutral. If the pH is less than 7 then the solution is acidic and a pH above 7 is basic solution.

Red- green color in pH scale represent the acidic solution where green is neutral and cyan to dark blue color is given by bases. Using a litmus paper the acidity can be checked based on these color change.

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Is a cell wall found in a plant cell?

Answers

Answer:

A plant cell has a cell wall but an animal cell dosnt have one

Explanation:

Brainliest plz

Explanation:

the cell wall surrounds the plasma membrane of the plant and provides tensile strength and protection against mechanical

"Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation."

Which statements correctly defend or dispute his conclusion?

A.)He is correct. Dissolving salt in water is a physical change, but evaporating the water is a chemical change. Formation of a solid is evidence that a chemical change occurred.

B.)He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.

C.)He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.

D.)He is incorrect. Dissolving salt in water and evaporation of the water are both chemical changes. The reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.

Answers

Answer:

C.)He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.

Explanation:

From the analogy of the problem presented, we can see that Henry is grossly incorrect. His conclusion from the process of the experiment he carried out is completely wrong.

Physical changes are changes that alters the physical properties of matter particularly the form and state.

Chemical changes leads to the formation of a new kind of matter.

 We can see that since the salt was obtained back after evaporation, no change has occurred to it.

Therefore, evaporation in itself is a physical change process.

Answer:

c on ed

Explanation:

At the end of which era did the dinosaurs became extinct?

Cenozoic

Jurassic

Mesozoic

Paleozoic

Answers

Answer:

Cretaceous Period

Explanation:

Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.

At the end of the Cretaceous Period

please help with this.

Answers

1. Double-Replacement reactions

2. Decomposition  

3. Combustion

4. Syntesis

5. Single replacement

Further explanation

Given

Chemical equations

Required

Type of reaction

Solution

1. 2AgNO₃ + MgCl₂ ⇒ 2AgCl + Mg(NO₃)₂

Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant

2. 2KBr⇒2K +Br₂

Decomposition  

Single compound breaks down in to 2 or more products

3. C₃H₈ + 5O₂ ⇒ 4H₂O + 3CO₂

Combustion

Hydrocarbon and Oxygen reaction and form water and carbon dioxide

4. NaO + H₂O ⇒ NaOH

Syntesis

2 or more reactants combine to form a single product

5. Zn + CuCl₂ ⇒ZnCl₂ + Cu

Single replacement

One element replaces another element from a compound

80g of calcium reacts with water to form 114g of calcium hydroxide and 2g of
hydrogen.
2 Ca + 2 H0+2CaOH + H,
What mass of water was used in this reaction?​

Answers

Answer:

31g

Explanation:

80g(Ca)+m(H2O)=114g(CaOH)+2g(H2)

the total mass of the prodicts doesn't change throughout the process

80g+m(H20)=116g

m(H20)=31g

HELP PLEASE!

Which below, are the smallest basic units of matter?

molecules

ozone

atoms

vitamin E

Answers

Answer:

atoms

Explanation:

How many atoms are in 4.1 grams of zinc?

Answers

Answer:

1 mole of zinc has 6.023 x 1023 atoms

So, 4.1 moles will have 4.1 x 6.023 x 1023 atoms = 24.694 x 1023 atoms

Explanation:

A 2.5 L container holds a sample of hydrogen gas at 291 K and 180 kPa.

If the pressure increases to 350 kPa and the volume remains constant, what will the new temperature be?

Round your answer to one decimal place.

Answers

Answer:

The new temperature will be 565.83 K.

Explanation:

Gay Lussac's law establishes the relationship between the temperature and the pressure of a gas when the volume is constant. This law says that the pressure of the gas is directly proportional to its temperature. This means that if the temperature increases, the pressure will increase; or if the temperature decreases, the pressure will decrease.

In other words, Gay-Lussac's law states that when a gas undergoes a constant volume transformation, the ratio of the pressure exerted by the gas temperature remains constant:

[tex]\frac{P}{T} =k[/tex]

When an ideal gas goes from a state 1 to a state 2, it is true:

[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]

In this case:

P1= 180 kPaT1= 291 KP2= 350 kPaT2= ?

Replacing:

[tex]\frac{180 kPa}{291 K} =\frac{350 kPa}{T2}[/tex]

Solving:

[tex]T2=350 kPa*\frac{291 K}{180 kPa}[/tex]

T2= 565.83 K

The new temperature will be 565.83 K.

Two bungee jumpers with the same mass stand on two buildings. One stands on a building 100ft tall and the other a building that is 200ft tall. Which has more potential energy and why?

Answers

Bungee jumpers that stand on a 200 ft building

Further explanation

Given

A building 100 ft tall

A building 200ft tall

Required

Which has the greatest potential energy

Solution

Potential energy is owned by an object because of its height

Can be formulated :

PE = m . g . h

g = acceleration due to gravity ,(m/s²)  

h = height , (m)  

m = mass, (kg)  

So PE is influenced by 3 factors:

the object's mass, its gravitational acceleration at that place and its height

Because the mass and gravitational acceleration are the same, the largest PE is owned by bungee jumpers that stand on a 200 ft building

Which statement describes the conditions in which diamonds form?
A.they form deep underground, in certain areas that are under a great deal of pressure.
B.they form as water evaporates on the shores of very salty bodys of water.
C.They form as water evaporates on the shore of any body of water.
D.they form deep underground, in most regions of earth.

Answers

A. Diamonds not created in a lab need specific extreme conditions to be formed. This is why they are a precious stone.

Answer:

a

Explanation:

PLEASE ANSWER 80 POINTS
Which response includes all of the following Z1) LiO2 + CO2 → Li2CO3 Z2) Cl2 + 2 NaBr → Br2 + 2 NaCl Z3) HNO3 + KOH → KNO3 + H2O Z4) SO3 + H2O → H2SO4 that are combination reactions, and none that are not combination reactions? 1. Z1 and Z4 only 2. Another reaction or another combination 3. Z1, Z3 and Z4 only 4. Z1 and Z2 only 5. Z1, Z2 and Z4 only

Answers

Answer:

z3 xCo2 + 75 = s01 + h20 = Z2

Explanation:

The study of chemicals is called chemistry.

The correct answer is A.

A combination reaction is defined as the joining of two different elements to form a new compound is called a combination reaction. A new compound is always formed in the reaction.

According to the question, in option A the [tex]Li_2Co_3[/tex] is formed and in reaction 4 [tex]H_2So_4[/tex] is formed.

Hence, the correct option is A that is Z1 and Z4.

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if an ion has 13 protons and 10 electrons what is the charge on the ion?

Answers

Answer:Al3+ indicates an ion of aluminum having a charge of + 3. I.e., since an aluminum atom normally has 13 protons and 13 electrons, this ion has 10 electrons (-10 charge) and 13 protons (+ 13 charge) giving it a charge of + 3 (-10 + 13 = +3).

Explanation:

The ion will have a charge of +3

The components of an atom and their charges are:

protons which have a positive charge electrons which have a negative charge neutrons which have no charge

The charge of an ion will therefore depend on the number of electrons and protons as they cancel each other out.

The number of excess protons in this ion will be:

= Number of protons - number of electrons

= 13 - 10

= 3

Protons have a positive charge so there will be a charge of +3 as there are 3 excess protons.

In conclusion, this ion will have a charge of +3.

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10 points!! Please give me work with it and I will mark as brainlist.

Answer the question below. Use the rubric in the materials for help if needed.
A compound is 40.0 % C, 53.3 % 0, and 6.66 % H What is its molecular formula if its molecular mass is 60 g? Show all your work.

Answers

Answer: The molecular formula will be [tex]C_2H_4O_2[/tex]

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C = 40.0 g

Mass of O = 53.3 g

Mass of H = 6.66 g

Step 1 : convert given masses into moles.

Moles of C =[tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{40.0g}{12g/mole}=3.33moles[/tex]

Moles of O =[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{53.3g}{16g/mole}=3.33moles[/tex]

Moles of H =[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{6.66g}{1g/mole}=6.66moles[/tex]

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = [tex]\frac{3.33}{3.33}=1[/tex]

For O =[tex]\frac{3.33}{3.33}=1[/tex]

For H = [tex]\frac{6.66}{3.33}=2[/tex]

The ratio of C : O : H = 1: 1: 2

Hence the empirical formula is [tex]COH_2[/tex]

The empirical weight of [tex]COH_2[/tex] = 1(12)+1(16)+2(1)= 30g.

The molecular weight = 60 g/mole

Now we have to calculate the molecular formula.

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{60}{30}=2[/tex]

The molecular formula will be=[tex]2\times CH_2O=C_2H_4O_2[/tex]

Why is it not possible to use solid sodium hydroxide directly to make a standard NaOH
solution?

Answers

Answer:

Sodium hydroxide is deliquescent (absorbs moisture from the atmosphere) solid. It cannot be weighed accurately. Therefore, it is not possible to prepare a standard solution of sodium hydroxide of accurately known concentration by weighing NaOH.

help me please asap ...........................................

Answers

3. The Chemical property of an unknown element is the number of valence electrons
4. The number of protons in one atom of an element
Hope I helped :))

Define Strain
HELP ASAPPP!!!!!

Answers

Answer:

Ratio of the change in length to original length.

Explanation:

(Δl)/l

Other Questions
75 = n + 12Help! Me solve Pension data for Goldman Company included the following for the current calendar year: Service cost$140,000 PBO, January 1 650,000 Plan assets, January 1 700,000 Amortization of prior service cost 5,000 Amortization of net loss 1,000 Discount rate, 6% Expected return on plan assets, 8% Actual return on plan assets, 10% Required: Determine pension expense for the year. (Amounts to be deducted should be indicated with a minus sign.) Light changes direction when it passes through the air and hits the surface of water. Which statement best describes whathappens to the light as it encounters the water?OA. The light path splits as it enters the water.B. The light path bends as it enters the water.C. The light is absorbed by the water.D. The light is stored as energy within the water.oo What should you do if you determine the root cause and find that it is out of your control? a. Nothing. Once you determine the root cause, your work is done whether it is in your control or not. b. Use a different analysis tool c. Quit d. Go back up to the previous question and see if you have control over that response 21. (03.07 LC) Read and choose the correct option to complete the sentence. Mi abuela quiere ______ para estar saludable. A. comerse muchos dulcesB. mantenerse en forma C. tener estrs D. tomar refrescos write difference between aerobic and anaerobic repiration? A website averages 800 visitors per day.Based on that rate,what percent of a weeks visitor come to the website on an average day?Round your answer to the nearest tenth. Give a about convex mirror A mathematical phrase represented by numbers, variables, and operations is a(n)pls help:) the middle layer of earth is called the -------. it is made up of hot ,dense rock called---------. Pablo shares 525 cupcakes in the ratio of 3 : 4 between his bakery and a supermarket.How many cupcakes does the supermarket get? how to integrate [tex]e^{2s} *Cos \frac{s}{4}[/tex] , please help, I have no idea what to do, I would appreciate if you show your work with steps. PMI (Private Mortgage Insurance) protects the lender in case the borrower cannot make the loan payments. It is often required when the amount of the loan is close to the value of the home. PMI typically annually costs about .75% of the entire loan. On a $100,000 loan what would you be paying per month? NEED HELP ASAP PLS DONT SKIP GIVING BRAINLIEST . Which of the following conclusions can be drawn about the character Johnny? A. Johnny's experience getting jumped by the Socs made him more suspicious of people outside of the gang.B. Johnny has never known love and affection.C. Johnny's home life causes him to be nervous during a rumble.D. Johnny is more fearful of his father than his mother. What causes a earthquake how many moles are there in 67.2 grams of h2 What were the effects of several supreme court decisions? Solve for the variable: a-9=-5 What happened to the European colonies in Asia and Africa following World War 2?