Combustion reactions release large amounts of energy as heat
and/or light.
TRUE
FALSE
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The number of moles of the particles in the container is  8.4 * 10⁻⁴ moles.

The number of moles of particles of  the particle in the container is found as follows:

Mass of one atom of the particle = 62.0 ng

Mass of one atom of the particle in g =  6.2 × 10⁻⁸ g

Mass of one atom of the particle in kg = 6.2 × 10⁻¹¹ kg

Number of particles in 1 mole = 6.02 * 10²³

Mass of 1 mole of the particle = 6.02 × 10²³ × 6.2 × 10⁻¹¹ kg

Mass of 1 mole of the particle = 3.7 × 10¹³ kg

Number of moles in 3.11 * 10¹⁰ kg = 3.11 * 10¹⁰ kg/3.7 × 10¹³ kg/mol

Number of moles in 3.11 * 10¹⁰ kg = 8.4 * 10⁻⁴ moles

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Answer:  The "conversion factor" is:
___________________

"   1000 mL "  
       1 L    
___________________  

Explanation:
Note the exact values:  1 L = 1000 mL

                           and:  1000 mL = 1 L .

{Note:  " L = liter(s) " ;  and:  " mL = millileter(s) ".}.

________________________

35 L * 1000 mL  
            1 L           ;

We cancel out the 2 (two):  " L " ["Liters"] ; since:  [" L ÷ L = 1 "].

Then we can convert the value—into units of "mL" ;

 →  35 * (1000 mL) = (35 * 1000) mL =  35,000 mL.

________________________
Note that the question asks for the:

"conversion value needed to convert [35 L into mL] ;

By using the technique shown above; known as "dimensional analysis, we use that particular conversion faction—of a manner in which one multiplies by a "fraction";  so that:  
  1) the correct units for the particular value one is seeking that can be obtained—and in which the values, or more relevantly, the units —that are "not needed" can be "canceled out" ; and:
 2) The problem can be solved.
________________________
Note:  The above information is just information that provides an explanation of the concepts surrounding the "actual answer"—of this very question."

The actual answer to this Brainly question:
 As shown above:
_____________

The 'conversion factor is:
"   1000 mL "  
       1 L      

 __________
Hope this lengthy explanation—and answer—are helpful.
Best wishes!

Answer:

1000/1

Question 5 options:

Multiplying by which conversion factor would allow you to co

Explanation:

The molecular formula of trinitrogen heptoxide is written as [tex]N_3O_7[/tex].

How to calculate the molecular formula of Trinitrogen heptoxide:

Tri means three and hept means seven. Therefore,

Trinitrogen means 3 atoms of Nitrogen, thus it is denoted as [tex]N_3[/tex].

Heptoxide means 7 atoms of Oxygen, thus it is denoted as [tex]O_7[/tex].

Consequently, the molecular formula of Trinitrogen heptoxide is [tex]N_3O_7[/tex].

The type and number of each element's atoms in a molecular compound are indicated by the substance's molecular formula. The molecular formula is frequently the same as the empirical formula. Methane's empirical formula is [tex]CH_4[/tex], which is also its molecular formula because it only has one carbon atom.

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Answer:

Campher freezes are in winter

At constant temperature and volume, the average kinetic energy of the particles remains constant. The correct option is A.

An object's kinetic energy is the energy it has as a result of its motion. It is characterized by the amount of work needed to propel a body of a given mass from rest to a given velocity.

The body retains its kinetic energy after gaining it during acceleration unless its speed changes.

The average kinetic energy of a gas when its particles collide against each other at constant temperature and volume. This is valid as long as as the temperature stays the same.

Thus, the correct option is A.

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Answer:

What are often called carbon sinks like tropical forests only store carbon temporarily. The only real carbon sinks operate by the long term ...

Explanation:

the oceans and atmosphere, and dissolved organic matter is carried in solution by rivers from soils to the sea. This all constitutes the short-term carbon cycle. The word "short-term" is used because the characteristic times for transferring carbon between reservoirs range from days to tens of thousands of years.

In the short-term reservoir, carbon is stored in the atmosphere, oceans and biosphere with the ocean containing the largest amount of carbon. It takes months to centuries to recycle carbon dioxide through the short-term reservoir.

Carbon is stored in four main reservoirs -- oceans (the largest reservoir), geological reserves of fossil fuels, the terrestrial surface (plants and soil, mainly), and the atmosphere.

The ionic equations of the given reactions are as follows:

Ionic equations are equations which shows the ions involved in a given redox reaction as they react to form products.

The ionic equations of the given reactions are as follows:

a) precipitation of iron(III) hydroxide when solutions of sodium hydroxide and iron(III) nitrate are mixed

Molecular equation: NaOH + Fe(NO₃)₃ → Fe(OH)₃(s) + NaNO₃

Ionic equation: Na⁺ OH⁻ + Fe³⁺ 3NO₃⁻ →  Fe(OH)₃(s) + 3Na⁺ 3NO₃⁻

b) redox reaction between solution of silver(1) nitrate and magnesium metal

Molecular equation: 2 AgNO₃ + Mg → Mg(NO₃)₂ + 2 Ag (s)

Ionic equation: 2Ag⁺ 2NO₃⁻ + Mg → Mg²⁺ 2NO⁻ + 2 Ag (s)

c) acid-base reaction between sulfuric acid and potassium hydroxide

Molecular equation: H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O

Ionic equation: 2H⁺ SO₄²⁻ + 2K⁺ 2OH⁻ → 2K⁺ SO₄²⁻ + 2H₂O (l)

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Explanation:

basically first you have to understand these definitions

*mass number ( e.g. where it says oxygen 16 or 17 - it's basically that number at the top)

mass number is the 'number of protons + number of neutrons'

now this will help you do the first question

if you do 16 -8 = 8 ( that's how she got 8 neutrons)

another thing you need to know is that all the time the number of protons = the number of electrons ( they are the same)

this will help you answer table 2

for fluorine it says there are 9 electrons, you automatically have to think 9 electrons means 9 protons too, ( I think she has got that wrong, it's supposed to be 9 protons not 19)

if you have 9 protons and the given 10 neutrons and add them together you will get the mass number which is supposed to be 19

then if you try out the same rules for argon you will see they work - the number of electrons and protons are same and when you find out the protons, you can just take that away from the mass number ( which is number of protons + neutrons) to get just the number of neutrons.

Hope this helps you :)

The mass of oxygen in 4 moles of C2H4O2 is 128g.

The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.

Molar mass of C2H4O2 = 12(2) + 1(4) + 16(2) = 60g/mol

mass of C2H4O2 = 60g/mol × 4 moles = 240grams

However, the mass of oxygen in the compound can be calculated as follows:

molar mass of oxygen/molar mass of compound × 240 grams

32g/mol ÷ 60g/mol × 240g

= 128g

Therefore, the mass of oxygen in 4 moles of C2H4O2 is 128g.

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The statement is true because ions are mobile in the solution and the presence of uncharged particles do not affect conductivity. Option A

An electrolyte is a solution that is able to conduct electricity. We know that the electrolyte is able to conduct electricity because of the presence of ions in the solution. These ions are mobile charges that move in between the electrodes and make the movement of electricity possible.

If we introduce uncharged particles into this solution, they do not in anyway affect the charged particles from the electrolyte. Hence, the statement is true because ions are mobile in the solution and the presence of uncharged particles do not affect conductivity. Option A

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Answer:

Coal Is A Combustible Black Or Brownish Black Sedimentary Rock With A High Amount Of Carbon And Hydrocarbons. Coal is Classified As As A Nonrenewable Coal Energy Source Necause It Takes Millions Of Years To Form .Coal Contain The Energy Stored By Plant That Lives Hundreds Of Millions Of Year Ago In Swamphy Forests .

Civilian bombing drills at home is not a way in which the US began preparing for war before officially joining.

War is defined as an intense arm conflict between states, governments societies or parliamentary groups. It is also defined as a violent conflict between states, contraries or nations.

It is very aggressive competition between groups of people, companies countries etc.

US began preparing for war before joining by positioning the economy for war, enlarging the military and giving aid to allies.

Thus, civilian bombing drills at home is not a way in which the US began preparing for war before officially joining.

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Number of atoms present in 9.6g of Mg element is 24.08 × 10^23

Given,

given mass of magnesium is 96g

molar mass of magnesium 24 g/mol

First we will find out number of moles in 96g of magnesium.

Number of moles = given mass / molar mass

= 96 / 24 = 4

To find number of atoms we will multiply no of moles to avagadro number

number of atoms = 4 × 6.02 × 10^23

= 24.08 × 10^23

Hence number of atoms in 96 g of magnesium are 24.08 × 10^23

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Strain energy for the conformer is 13.8 kj/mol

Energy of eclipsed H-H bond is 4.0 kJ mol

Energy of eclipsed Н-СH3 bond is 5.8 kJ mol

Total strain energy of conformer (S,) E=2×ECLIPSED(H-H)+eclipse(H-CH3)

Substitute, 4.0 kJ mol for eclipsed (H-H) and 5.8 kJ mol for eclipsed (H-CH thus,

E =2x4.0 kJ mol +5.8 kJ mol

E=13.8 kJ mol

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Answer:

Inner core - A

Outer core - B

Mantle - C

Asthenosphere - F

Lithosphere - E

Crust - D

Molecular formula of Tartaric Acid is C ₄ H ₆ O ₆ .

As it is given that ,

C = 32 . 04 %

H = 4 . 03 %

O = 63 . 96 %

So , composition in grams is :

C = 32.04 g

H = 4.03 g

O = 63.96 g

Now we have to find no. of moles of each element :

C = 32.04 / 12 = 2.67

H = 4.03 / 1 = 4.03

O = 63.96 / 16 = 3.99

Dividing no. of moles with smallest no. of moles .

For C , 2.67 / 2.67 = 1

For H , 4.03 / 2.67 = 1.5 ≈ 2

For O , 3.99 / 2.67 = 1.49 ≈ 2

So , Empirical formula = C₂ H₃ O₃

E.F. Mass = 24 + 3 + 48 = 75 amu

Molecular  mass = 150 amu

So , n = Molecular  mass / E.F. Mass

      n = 150 /75

      n = 2

So , Molecular formula = ( C H₂ O₂ )n

=  ( C₂ H₃ O₃ ) ₂

= C ₄ H ₆ O ₆

Hence , Molecular formula of Tartaric Acid is C ₄ H ₆ O ₆ .

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The number of trucks is 205 trucks

The specific gravity refers to the ratio of the density of an object to the  density of water. This implies that the density of the object is 0.00325 g/cm^3.

Now;

Density = mass/volume

volume of the object = 48.0ft ^3 or 1.359 * 10^6 cm^3

Thus we can obtain the mass of the object from;

mass = density * volume =  0.00325 g/cm^3 * 1.359 * 10^6 cm^3

= 4417 g

We have to convert 1 ton to gram and have 907185 g

The number of trucks that we need to transport this quantity is;

907185 g/4417 g = 205 trucks

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Answer: 122 cm^3

Explanation:

2500.0 g * 1 cm^3/20.5 g=

2500.0 * 1/20.5=

2500.0/20.5=122 cm^3

Answer:

2.237 x 10²⁴ molecules CH₃CO₂K

Explanation:

To find the amount of molecules, you need to (1) convert grams to moles (using the molar mass of potassium acetate) and then (2) convert moles to molecules (using Avogadro's Number). It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 4 sig figs like the given value (3.645 x 10² = 4 sig figs).

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Atomic Mass (O): 15.999 g/mol

Atomic Mass (K): 39.098 g/mol

Molar Mass (CH₃CO₂K):

2(12.011 g/mol) + 3(1.008 g/mol) + 2(15.999 g/mol) + 39.098 g/mol

= 98.142 g/mol

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

3.645 x 10² g CH₃CO₂K            1 mole             6.022 x 10²³ molecules
-------------------------------------  x  -----------------  x  -------------------------------------  =
                                                  98.142 g                         1 mole

=  2.237 x 10²⁴ molecules CH₃CO₂K

The correct statement about a water molecule, H₂O and a carbon dioxide molecule, CO₂ is: They are made from different types of atoms, combined in different ways; option D

Water molecule is a polar molecule composed of one atom of oxygen and two atoms of hydrogen.

The bond between the atoms of hydrogen and oxygen are covalent bonds but the molecule is polar due to the high electronegativity of the oxygen atom.

The shape of a water molecule is pyramidal.

Carbon dioxide molecules are composed of two atoms of carbon and one atom of oxygen joined together by covalent bonds.

Carbon dioxide is non-polar and the shape of the molecule is linear.

Therefore, comparing a water molecule H₂O to a carbon molecule CO₂ shows that they are composed of different atoms arranged differently.

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Note that the complete question is given below:

**Compare a water molecule, H2O, to a carbon dioxide molecule, CO2.**

Which statement is true?

They are made from the same types of atoms combined in the same way.

They are made from different types of atoms, combined in the same way.

They are made from the same types of atoms, but combine in different ways.

They are made from different types of atoms, combined in different ways.

National Association for the Advancement of Colored People  group helped Fred Korematsu defend himself in court,

Fred Toyosaburo Korematsu (January 30, 1919 – March 30, 2005) was an American civil rights activist who opposed Japanese American incarceration during WWII. Shortly after the Imperial Japanese Navy attacked Pearl Harbor, President Franklin D. Roosevelt issued Executive Order 9066, which authorised the removal of Japanese-Americans living on the West Coast from their homes and their mandatory imprisonment in incarceration camps, but Korematsu instead challenged the orders and fled.

The validity of Roosevelt's order was maintained by the United States Supreme Court in Korematsu v. United States. (1944). However, Korematsu's conviction for avoiding imprisonment was overturned in US District Court four decades later, following the emergence of fresh information questioning the necessity of internment.

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5 significant, because u have to start counting after the point

There are four significant figures in the given measurement  as there are  four non-zero numbers after the decimal.

Significant figures are used for establishment  of a number which is presented in the form of digits. These digits give a meaningful representation  to the numbers.

The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:

1)All non-zero digits are significant .

2)All zeroes which occur between non-zero digits are significant.

3)All zeroes to the left and right of  a non-zero digit are not significant.

4) All zeroes on right  of decimal are significant if a non-zero number follows them.

5)All zeroes on right side of non-zero digit are significant.

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Answer:lol

Explanation:

The terms used to complete the statement are:

In this experiment:

Select term variables:

1. Source of paper towel used

2. Light intensity

3. Temperature of the room

The addition of water to the paper towel is the:

Independent variable (sometimes referred to as the manipulated variable or cause variable).

The number of pill bugs observed on each paper towel over time is the:

Dependent variable (sometimes referred to as the responding variable or effect variable).

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The question attached here is seems to be incomplete, the complete question is

Select the correct term to complete each sentence:

1. The source of paper towel used, light intensity, and temperature of the room are all __________ variables in this experiment.

2. The addition of water to the paper towel is the  __________ variable.

3. The number of pill bugs observed on each paper towel over time is the  __________ variable.

(A) The volume of Carbon tetrachloride is 96.2 ml

(B) The density of Solid object is 3.89 g/mL

(C) The mass of water in grams is 425 gram

(A)

Molar mass of Carbon tetrachloride is 153g/mol

Density is given as 1.59g/ml

Density = mass/volume

1.59 = 153/volume

volume = 153/1.59 = 96.2 ml

Hence, volume of Carbon tetrachloride is 96.2 ml

(B)

The experiment applies Archimedes' principle, according to which the volume of a liquid that an object displaces is equal to the volume of the thing itself.

As a result, the object's displacement of volume is:

18.9 mL - 43.9 mL = 25.0 mL

The item has a capacity of 18.9 mL.

The mass divided by the volume gives the density, so:

D = m / V = 73.5 g /18.9 mL

D = 3.89 g/mL

Hence, density of Solid object is 3.89 g/mL

(C)

Volume of water in beaker = 425 ml

Density of water is 1g/ml

Density = Mass/Volume

Mass = Density x Volume = 425 x 1 = 425 gram

Hence, mass of water in grams is 425 gram

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There is 100.0-mL graduated cylinder containing 50.0 mL of water. The final volume reading in the graduated cylinder is 62.7 mL.

Volume is the space occupied by the three-dimensional object.

Given,

Density of liquid = 8.56 g/mL

Mass of substance = 109 g

The initial level of the water in the graduated cylinder = 50 .0 ml

To calculate the volume of a substance,

Density = mass / volume

8.56  = 109  / volume

volume = 109 / 8.56

V = 12.7 ml

The final volume reading in the graduated cylinder

50 ml + 12.7 mL = 62.7 mL

Thus, the final volume will be 62.7 mL

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