A student found the percent composition of CO to be 50% C and 50% O. What did the student do Incorrectly? What is the percent composition of CO?

The acceleration of the plane : -2 m/s²(negative=deceleration)

Given

vo=245 m/s

vt=230 m/s

t = 7 s

Required

The acceleration

Solution

Motion with constant acceleration

[tex]\tt v_t=v_o+at[/tex]

Input the value

[tex]\tt 230=245+a.7\\\\-15=7a\Rightarrow a=-2.14\approx rounded~-2~m/s^2[/tex]

Answer:

Explanation:

Edge 2020

Explanation:

Mass of C = 112g * (85.6/100) = 95.87g

Moles of C = 95.87g / (12g/mol) = 8

Mass of H = 112g * (14.4/100) = 16.13g

Moles of C = 16.13g / (1g/mol) = 16

Hence the compound is C8H16. (D)

Answer:

i think it might be c

Explanation:

i'm not positive though

Answer:

C

Explanation:

Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains.

Answer:

ok so im gonna go and do some for your latest questions then if thats alright with you

Explanation:

i need points so im trying to help as many people as i can before the end of the day.

but you have to make the questions forst so i can help you understand them

Answer:

In a turbine generator, a moving fluid—water, steam, combustion gases, or air—pushes a series of blades mounted on a rotor shaft. The force of the fluid on the blades spins/rotates the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy.

Explanation:

Hope this helps!

Brain-List?

Answer:

Alkali metals are soft and have low melting points.

Answer:

propyl

Explanation:

CH3-CH(CH3)-CH2 is a propyl group, the halogen is bromine thus the common name is propyl bromide

Answer:

Elephant Toothpaste

Extra

Make Elephant Toothpaste

Pour 1/2 cup hydrogen peroxide solution, 1/4 cup dishwashing soap, and a few drops of food coloring into the bottle. Swish the bottle around to mix the ingredients. Set the bottle in a sink or outdoors or some other place where you won't mind getting wet foam everywhere.

In a separate container, mix a packet of active yeast with a little warm water. Give the yeast about five minutes to activate before proceeding to the next step.

When you are ready to do the demo, pour the yeast mixture into the bottle. The reaction occurs immediately upon the addition of the yeast.

I don't know if this will help but here you go.

Answer:

I think its C

Explanation:

because it travels from the sun to earth

C.ice at 0 degree

Explanation:

because sound transmit faster in solid medium as there molecules are cosely packed

Answer:

The Answer to this question is given below in this explanation section.

Explanation:

"C" option is correct

    "ice at 0°C"

sound waves can only travel through a solid,liquid or gas medium.They travel fastest in solids,then liquid and slowest in gases.

Three phases of matter(gas,liquid and solid) sound wave travel in the slowest through gases fastest through solids.Sound wave need to travel through a medium such as solid liquid and gases.The sound wave move through each of these medium by vibrating the molecule in the matter.The molecule in solid are packed very tightly.Liquid as not packed are tightly.And gases are very loosely packed.This enables sound to travel much faster through a solid than gas.Sound travel about four time faster and further in water than it does in air.Sound waves travel about thirteen times faster in wood than air.They also travel faster on hotter days as the molecule bump into each other more often then when it is cold.Sound travels more quickly through solid then through liquids and gases because the molecules of a solid are closer together and,therefore can transmit the vibration faster.sound travels most slowly through gases because the molecule of a gas are farthest apart.    

Answer:

43.5 moles of HNO₃.

Explanation:

The balanced equation for the reaction is given below:

S + 6HNO₃ —> H₂SO₄ + 6NO₂ + 2H₂O

From the balanced equation above,

6 moles of HNO₃ reacted to produce 2 moles of H₂O.

Finally, we shall determine the number of mole of HNO₃ required to produce 14.5 moles of H₂O.

This can be obtained as illustrated below:

From the balanced equation above,

6 moles of HNO₃ reacted to produce 2 moles of H₂O.

Therefore, Xmol of HNO₃ will react to produce 14.5 moles of H₂O i.e

Xmol of HNO₃ = (6 × 14.5)/2

Xmol of HNO₃ = 43.5 moles

Therefore, 43.5 moles of HNO₃ is required to produce 14.5 moles of H₂O.

Answer:

no , it's clear like a mirror

there's is nothing blurred

C.5

Given:

Electron distribution: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹.

A number of electrons present in valence shell of penultimate Shell represents the group of elements.

For s block elements: No. of group=number of valence shell electron.

p block elements: no. of group= 2 + 10 + number of valence electrons.

d block elements: no. of group= number(n-1)d electrons + number of electrons in nth shell.

Here, the differential electron is in p orbital hence, it belongs to p block

No. of group= 2+ 10 + 3=15 i.e. 15th group or VA group.

Therefore, the correct option is B.

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Answer:

Volume = 0.2 L

Explanation:

Given data:

Number of moles of NH₄NO₃ = 1.2 mol

Molarity of solution = 6 M

Volume of solution = ?

Solution:

Formula:

Molarity = number of moles / volume of solution

by putting values,

6 M = 1.2 mol / Volume

Volume = 1.2 mol / 6 mol/L

Volume = 0.2 L

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 2 \times {15}^{2} \\ = 1 \times 225 \\ = 225 \: \: \: \: \: \: \: \: [/tex]

We have the final answer as

Hope this helps you

Answer:

225 J for both answers

Explanation: :)

Answer: An ionic solution is when the ions of a compound have dissociated in an aqueous solution. A reaction happens when you mix two aqueous solutions. This is when you find out if a precipitate will form or not. A precipitate forms if the product of the reaction of the ions is insoluble in water.

Explanation: I think ;>;

Answer:

See explanation

Explanation:

A Lewis or dot structure shows the electrons on the valence shells of the bonding atoms as dots.

The method was developed by Sir G.N Lewis.

Oxygen is a diatomic molecule as shown in the image attached to this answer. There are two unshared electrons on each oxygen atom as well as four shared electrons

The sharing of electrons between the two oxygen atoms results in the completion of the octet and thereby stabilizing the atoms.

Oxygen has been a group 6A element consisting of 6 valence electrons. In order to attain the stable configuration, the atom of oxygen has been required to gain two electrons.

The oxygen shares its electrons with another oxygen atom and forms a covalent bond. The resulted bond has been able to stabilize the structure.

The image attached shows the lewis dot structure of the oxygen atom. The sharing of electrons between the two oxygen atoms results in the completion of the octet and thereby stabilizing the atoms.

For more information about the lewis dot structure, refer to the link:

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Answer:

A water repellent protein that divides into hard and soft types

Answer:

in copper from different plastics because appliances of codes to power day in wire copper the cover to use to plastic

The mass of iron (III) oxide (Fe2O3) : 85.12 g

Given

3.20x10²³ formula units

Required

The mass

Solution

1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mol of Fe₂O₃ :

[tex]\tt n=\dfrac{3.2.10^{23}}{6.02.10^{23}}=0.532[/tex]

mass of Fe₂O₃ (MW=160 g/mol)

[tex]\tt mass=mol\times MW=0.532\times 160=85.12~g[/tex]

We have 84.84g of  Fe[tex]_2[/tex]O[tex]_3[/tex] in 3.20*10^23 particles.

Data;

To solve this problem, we need to relate Avogadro number to the molar mass.

From molar mass - Avogadro's number relationship;

[tex]159.69g = 6.023*10^2^3\\xg = 3.20*10^2^3\\x = \frac{159.69*3.20*10^2^3}{6.023*10^2^3} \\x = 84.84g[/tex]

From the above calculations, 84.84g of Fe[tex]_2[/tex]O[tex]_3[/tex] is present in 3.20*10^23 particles of  Fe[tex]_2[/tex]O[tex]_3[/tex].

Learn more on Avogadro's number here;

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Answer:

C.) Avogadro's number represents the number of particles in one

mole.

Explanation:

Considering the definition of Avogadro's number, the correct answer is option C. Avogadro's number represents the number of particles in one  mole.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.

Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression.

Avogadro's number applies to any substance.

Finally, the correct answer is option C. Avogadro's number represents the number of particles in one  mole.

Learn more about Avogadro's Number:

Answer: It’s Nh !!!

Explanation:

Alkali metals and alkaline earth metals always produce cations, while halogens always produce anions. so, option A is correct.

A cation has a net positive charge because it contains more protons than electrons. One or more electrons must be lost in order for a cation to develop normally, these electrons are drawn away by atoms having a larger attraction for them.

Main-group elements often produce cations with a charge equal to the group number as they move from the extreme left to the right on the periodic table. To put it another way, group 1 elements produce 1+ ions, group 2 elements produce 2+ ions, and so on.

Cations, which have a positive charge, are created when electrons are lost. Anions, which have a negative charge, are created when electrons gain energy.

Thus, option A is correct.

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The percent yield : 95%

Given

Reaction

2H₂+O₂ ⇒2H₂O

Required

The percent yield

Solution

mol of Hydrogen(as a limiting reactant) :

[tex]\tt \dfrac{100}{2}=50[/tex]

mol H₂O based on H₂ , and from equation mol ratio H₂:H₂O=2 : 2, so mol H₂O = 50

Mass of water(theoretical yield) :

[tex]\tt mass=50\times 18=900~g[/tex]

[tex]\tt \%yield=\dfrac{860}{900}\times 100\%=95\%[/tex]

2.999 mol Br

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

1.806 × 10²⁴ molecules Br

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[tex]\displaystyle 1.806 \cdot 10^{24} \ molecules \ Br(\frac{1 \ mol \ Br}{6.022 \cdot 10^{23} \ molecules \ Br} )[/tex] = 2.999 mol Br

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

Our final answer is already in 4 sig figs, so there is no need to round.

Answer:

[tex]\boxed {\boxed {\sf About \ 2.999 \ moles \ of \ bromine}}[/tex]

Explanation:

To convert from moles to molecules, we must use Avogadro's Number.

[tex]6.022*10^{23}[/tex]

This tells us the number of particles (atoms, molecules, ions, etc) in 1 mole. In this problem, the particles are molecules of bromine in 1 mole of bromine.

[tex]6.022*10^{23} \ molecules \ Br / 1 \ mol \ Br[/tex]

1. Convert from moles to molecules

Use Avogadro's number as a fraction or ratio.

[tex]\frac{6.022 *10^{23} \ molecules \ Br}{1 \ mol \ Br}[/tex]

Multiply this fraction by the given number of bromine molecules.

[tex]1.806 *10^{24} molecules \ Br *\frac{6.022 *10^{23} \ molecules \ Br}{1 \ mol \ Br}[/tex]

Flip the fraction so the molecules of bromine can cancel out.

[tex]1.806 *10^{24} \ molecules \ Br* \frac{1 \ mol \ Br}{6.022 *10^{23} \ molecules \ Br}[/tex]

[tex]1.806 *10^{24} * \frac{1 \ mol \ Br}{6.022 *10^{23}}[/tex]

Multiply and condense the expression into 1 fraction.

[tex]\frac{1.806 *10^{24} \ mol \ Br}{6.022 *10^{23} }[/tex]

Divide.

[tex]2.999003653 \ mol \ Br[/tex]

2. Round

The original measurement, 1.806*10^24 has 4 significant figures (1, 8, 0, and 6). We must round our answer to 4 sig figs. For the answer we found, that is the thousandth place.

[tex]2.999003653 \ mol \ Br[/tex]

The 0 in the ten-thousandth place tels us to leave the 9 in the thousandth place.

[tex]\approx 2.999 \ mol \ Br[/tex]

There are about 2.999 moles of bromine in 2.806 *10^23 molecules.

Answer:

The names of the reactant and products are:

1. The name of the reactant is calcium trioxocarbonate (iv) (CaCO₃)

2. The names of the products are:

a. Calcium oxide (CaO)

b. Carbon (iv) oxide (CO₂)

In a chemical equation, the reactants are located on the left hand side (LHS) while the products are located on the right hand side (RHS)

With the above information, we can determine which is the reactant and which is the product in the question given above. This can be obtained as follow:

CaCO₃ —> CaO + CO₂

The name of CaCO₃ is calcium trioxocarbonate (iv).

The name of CaO is calcium oxide.

The name of CO₂ is carbon (iv) oxide

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Answer:

C6H12

Explanation:

Molar mass of C =12.0 H=1.0

12x + 2(1x) = 84

x = 6

so it should be C6H12

The molecular formula of the compound will be C₇H₁₄.

The empirical formula of the compound gives the simplest ratio of the number of different elements present in a compound. The molecular formula of the compound provides the actual number of each element present in a compound. This formula is generally used and can be determined as a multiple of the empirical formula of a compound.

The empirical formula offers the ratio of the number of each atom in a given compound. The composition of a compound is directly determined by its empirical formula.

Given, the empirical formula of the compound is  CH₂.

The empirical formula mass of the compound = 12 + 2 = 14 g

The molar mass of the compound = 84 g

The multiple will be = 84/12 = 7

The molecular formula of the compound = (CH₂)₇ = C₇H₁₄

Therefore, the molecular formula of the compound is C₇H₁₄.

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The given question is incomplete. The complete question is:

Which is true of Elements on a periodic table in the same group (family)?

A; Elements in the same family have similar chemical properties because they have the same number of electron shells.

B; Elements in the same family have similar chemical properties because they have the same number of valence electrons.

C; Elements in the same family have few similar properties as they have different numbers of electron shells.

D; Elements in the same family are always the same type of Elements and have the same number of protons.

Answer: B; Elements in the same family have similar chemical properties because they have the same number of valence electrons.

Explanation:

Elements are distributed in groups and periods in a periodic table.

Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons. The chemical reactivity of elements is governed by the valence electrons present in the element.

Example: Flourine, chlorine and bromine are elements which belong to Group 17. They have 9, 17 and 35 electrons respectively and contain 7 valence electrons each and need one electron to complete their octet.