In an experiment, the gram atomic mass of magnesium was determined to be 14.7. Compared to the accepted value of 24.3, the percent error for this determination was
39.5
1.65
24.7
98.4

Answer:

C₇H₁₄ and C₁₀H₂₀

Explanation:

The empirical formula is that which expresses the composition of a compound in the simplest whole number ratio of the atoms of the different elements that makes up the compound.

 C₇H₁₄ and C₁₀H₂₀

 In both species if we divide the number of atoms by the simplest common factor, we get CH₂

   C₇H₁₄  = CH₂ dividing by 7

   C₁₀H₂₀ =  CH₂ dividing by 10

Answer:

Answer:

1. Positive

2. Negative

3. Positive

4. Negative

5 positive

Explanation: I did this test before

The words have a positive, negative, positive, negative, positive connotation respectively in each of the given sentence.

Connotation is defined as a property of a particular word or name  which describes the ideas or qualities of the word.It is rather being named explicitly or described.

It is frequently described as a positive or negative connotation  which is in connection with its pleasing or displeasing connection. Connotation can have words with literal meaning with what they specifically denote.

There are  two types of connotations positive connotation and negative connotation wherein positive connotation has  positive impact while negative connotation has negative impact.It describes the primary word and it is not necessary that it be present in the sentence or phrase.

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Answer:

15.2L at STP

Explanation:

Given reaction expression;

         CaCO₃ → CaO + CO₂

Number of moles of CaCO₃  = 0.68mol

Unknown:

Volume of CO₂ produced at STP = ?

Solution:

To solve this problem, we must first find the number of moles CO₂ produced,

     1 mole of CaCO₃ will produce 1 mole of CO₂

   0.68mole of CaCO₃ will produce 0.68mole of CO₂ at STP

Now;

             1 mole of gas occupies a volume of 22.4L at STP;

           0.68mole of CO₂ will then occupy 0.68 x 22.4  = 15.2L at STP

the answer is boyle's law

Answer:

Boyle's Law

Explanation:

Other guy is right Edg. 2020

Answer:

D

Explanation:

Sweat glands remove waste

The correct association that lies between the structure and one of its functions is option D Sweat glands remove waste.

The sweat represents the fluid that comprises of mainly of water also there is much dissolved solid wastage that should be excreted via the sweat glands. It eliminates the excess water and salts also it served the function of colling the body at the time of thermoregulation.

Therefore, the option D is correct.

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Answer:

i think it MIGHT be D

Explanation:

Answer:

b

Explanation:

edge :)

Answer:

d. Metallic

c. S

Explanation:

A metallic bond is an interatomic bond in which valence electrons are constantly moving between atoms like a sea of electrons.

2. The bond type described in the second problem is an ionic bond. This results in the formation of crystal lattice with strong bonds.

Answer:

D. The noble gas configuration has been reached.

Explanation:

Answer:

c = 100 J/g.°C

Explanation:

Given data:

Mass of lime = 20 g

Heat absorbed = 80,000 J

Initial temperature = 10°C

Final temperature = 50°C

Specific heat capacity of lime = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 50°C - 10°C

ΔT = 40°C

80,000 J = 20 g×c×40°C

80,000 J = 800°C×c

c = 80,000 J /800g.°C

c = 100 J/g.°C

The specific heat capacity of the lime would be  is  c = 100 J/g.°C

The following formula should be used:

Q = m.c. ΔT

here

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Now

ΔT = 50°C - 10°C

= 40°C

So,

80,000 J = 20 g×c×40°C

80,000 J = 800°C×c

c = 100 J/g.°C

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Answer:

a) three pea halves

b) Electron configuration of the fluorine ion 1s2 2s2 2p6

Explanation:

The fluorine atom has seven electrons in its outermost shell and a total of nine electrons occupying three shells.

In the fluoride ion, the fluorine atom accepts one more electron to complete its outermost shell configuration (to have a filled shell as shown).

Hence the fluoride ion has 10 electrons with an electronic configuration of 1s2 2s2 2p6.

Mass of the product : 6.039 g

The reaction equation is the chemical formula of reagents and product substances

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products

Reaction

Ba(s)+Cl₂(g)⇒BaCl₂(s)

mol Ba(MW=137,327 g/mol) :

[tex]\tt \dfrac{4}{137.327}=0.029[/tex]

Mass of BaCl₂ :(MW=208,23 g/mol)

[tex]\tt 0.029\times 208.23=6.039~g[/tex]

the oxidation reaction between oxygen and sodium produces sodium oxide. In many cases, an element may form more than one oxide.

Explanation:

Answer:

Coal is formed when dead plant matter submerged in swamp environments is subjected to the geological forces of heat and pressure over hundreds of millions of years. Over time, the plant matter transforms from moist, low-carbon peat, to coal, an energy- and carbon-dense black or brownish-black sedimentary rock.

Answer:

Average atomic mass of carbon = 12.01 amu

Explanation:

Given data:

Average atomic mass = ?

Percent abundance of C-12 = 98.93%

Percent abundance of C-13 = 1.07%

Solution:

Average atomic mass of carbon = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass of carbon = (98.93×12)+(1.07×13) /100

Average atomic mass of carbon=  1187.16 + 13.91 / 100

Average atomic mass of carbon = 1201.07/ 100

Average atomic mass of carbon = 12.01 amu

Answer:

the wind belt one

Explanation:

mhm

Answer:The USA lives in the Westerly Windbelt

Explanation:

Explanation:

canot understand the question

Answer:

Multiply 1.25 by 0.04 and divide the result obtained by 1,000

Explanation:

Given parameter:

  Density of the gas:

           1.25 g/L

Now the problem here is to convert to ounce/milliliter;

     1gram  = 0.04ounce

     1 liter = 1000mL

 So;

    1.25g/ L  x [tex]\frac{0.04 ounce}{1g}[/tex]  x [tex]\frac{1L}{1000mL}[/tex]   = 5 x 10⁻⁵ounce/mL

Answer:

I believe C

Explanation:

The absence of air between the two forms a vacuum seal which preserves the contents inside. I think that's right... good luck :)

Answer:

1. Empirical formula => CH2O2

2. Molecular formula => C2H4O4

Explanation:

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

Carbon (C) = 26.4 %

Hydrogen (H) = 3.3 %

Oxygen (O) = 70.3 %

Molar mass of compound = 91.0 g/mol

Empirical formula =..?

Molecular formula =..?

1. Determination of the empirical formula of the compound.

C = 26.4 %

H = 3.3 %

O = 70.3 %

Divide by their molar mass

C = 26.4 /12 = 2.2

H = 3.3 /1 = 3.3

O = 70.3 /16 = 4.39

Divide by the smallest

C = 2.2 /2.2 = 1

H = 3.3 /2.2 = 2

O = 4.39 /2.2 = 2

Empirical formula => CH2O2

2. Determination of the molecular formula of the compound.

Molar mass of compound = 91.0 g/mol

Empirical formula => CH2O2

Molecular formula => [CH2O2]n

We shall determine the value of n as follow:

[CH2O2]n = 91

[12 + (2×1) + (2×16)]n = 91

[12 + 2 + 32]n = 91

46n = 91

Divide both side by 46

n = 91/46

n = 2

Molecular formula => [CH2O2]n

Molecular formula => C2H4O4

In the given case where 26.4 % Carbon , 3.3 % Hydrogen , 70.3 % Oxygen , and Molar Mass: 91.0 g/mol the:

Given:

Carbon (C) = 26.4 %  

Hydrogen (H) = 3.3 %  

Oxygen (O) = 70.3 %  

Molar mass of compound = 91.0 g/mol  

Determination of the empirical formula of the compound:-

The ratio is CHO = 1 : 1.5 : 2

multiply with 2 to find correct and complete number ratio

C = 1 × 2 = 2

H = 1.5 × 2 = 3

O = 2 × 2 = 4

Thus,  the Empirical formula => [tex]C_2H_3O_4[/tex]

Mass × n = molar mass

12 × 2 + 1 × 3 + 16 × 4 = 91

24 + 3 + 64 = 91

91 = 91

Thus moles are 1 which means

molecular formula =  ([tex]C_2H_3O_4[/tex])[tex]_1[/tex]

Thus, here in the given data:

Molecular Formula: ([tex]C_2H_3O_4[/tex])[tex]_1[/tex]

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Answer:

E

Explanation:

Just e

Answer:

1.10 × 10⁻¹² m

General Formulas and Concepts:

Chemistry - Atomic Structure

Speed of Light = Wavelength times Frequency

Explanation:

Step 1: Define

ν  = 2.73 × 10²⁰ Hz

Step 2: Find wavelength

3.0 × 10⁸ m/s = λ(2.73 × 10²⁰ Hz)

λ = 1.0989 × 10⁻¹² m

Step 3: Check

We are given 3 sig figs. Follow sig fig rules.

1.0989 × 10⁻¹² m ≈ 1.10 × 10⁻¹² m

Answer:

25mph

Explanation:

cold fronts generally Advance at an average speed of 20 to 25 miles per hour. Towards the east faster in the winter than summer and are usually oriented along the northeast to Southwest line

Answer: savory

Explanation:

SWEET is better in my opinion.

Answer:

Motion energy – also known as mechanical energy – is the energy stored in moving objects. As the object moves faster, more energy is stored. Motion energy is the sum of potential and kinetic energy in an object that is used to do work.

Explanation:

Hope this helped if so please leave a rating! :)

Thanks!

Answer:

iron nail

Explanation:

The characteristic of some repeating property can be used to find the answer is

The periodic table created by Mendeleev was initially based on the atomic weight of the elements, but he realized that the similarities of the atoms were greater if he used the atomic number, so he changed the ordering.

Mendeleev found that elements with the same number of electrons in their last shell had similar properties, when he ordered them he found that there were holes in the table, shortly after the work of many researchers the holes were completed and found numerous new chemical elements.

In the observation of the phases of the Moon around the earth it is found that for short measurements there are four phases, for longer measurements in addition to these four phases there are several higher repetition periods, with repeated observation the phases and periods are found. .

We can see that the two jobs are searched for, which is repeated and a table is created, leaving the spaces that are not known empty, with subsequent jobs filling these holes.

In conclusion, with the characteristics of some repeating property, the answer can be found is

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Gravitational potential energy to kinetic energy. Hence, option A is correct.

What is kinetic energy?

Kinetic energy is a form of energy that an object or a particle has by reason of its motion

If an avalanche occurs, the snow on the mountain accelerates downslope, converting more gravitational potential energy to kinetic energy.

Hence, option A is correct.

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Answer:

i think is o helium, He........

The electron dot structure of neon, argon, krypton, xenon and radon contains 8 valence electrons whereas, helium contains only 2 electrons. Thus, He is different from others.

Noble gases are 18th group elements in periodic table. They have completely filled electronic configuration. They need not to lose or gain electrons because they are stable.

Noble gases are helium, neon, argon , krypton, xenon and radon. He contains 2 electrons only. Its valence shell K is filled that's why He is considered as noble gas.

All other elements in the group neon, argon, krypton, xenon and radon contains 8 valence electrons. Therefore, the dot structure of He is different from its group members.

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Answer:

c.

Explanation:

Gravitational potential energy will rises