What is the atomic weight of gold ?

The volume of foil for 14.45cm times 8.55 cm times 0.550 g is

67.95 cm^3

Volume = lenght * breadth * height

          = 14.45cm * 8.55 cm * 0.550 cm

          = 67.95 cm^3

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The calculation gives the product 17000 to 2 significant figures

Significant figures in a calculation or a number refers to the number of non-zero numbers that are present in a number.

If the number contains a decimal point, the number of non-zero numbers before the decimal point gives the number of significant figures.

However, if a zero occurs between non-zero numbers, it is considered significant.

Significant figures are used in approximation to indicate to what point a set of numbers become significant.

In a calculation, the number significant figure is determined by the number which has the lowest number of significant figures.

In the given calculation, the lowest significant figure is in the numbers 3700 and 5.60

3700 × 20.1 × 5.60 × 0.0407 = 17000 to 2 significant figures

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Answer:

because the water is like a magnified glass Its on your hand and your hand apears bigger

Explanation:

Answer:

um 27 yards..............

Answer:

This one also it is opposite of endothermic reaction

The energy of an orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 5.88 x 10⁻⁷ is 3.38 x 10⁻¹⁹ J.

Frequency is defined as the number occurrences of repeated events per unit of time. SI unit is hertz (Hz).

Using the formula,

                    E = hν

where,

E = energy in joules (J)

h = Planck's constant =  6.63 x 10⁻³⁴ Js

ν = frequency in hertz

Given :

frequency = 5.10 x 10¹⁴ Hz

h = 6.63 x 10⁻³⁴ Js

Putting the values,

E = (6.63 x 10⁻³⁴) x (5.10 x 10¹⁴) J

E = 3.38 x 10⁻¹⁹ J

Therefore, the energy of an orange lamp with a frequency of 5.10 x 10¹⁴ is  3.38 x 10⁻¹⁹J.

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Marjorie's unknown substance is sodium chloride NaCl.

The substance is insoluble in CCl₄. The density of the substance is 2.2 g/mL.

Solubility:

The fact that the chemical is insoluble in CCl₄ (tetrachloromethane), as indicated in the statement, indicates that the substance is polar in nature. Only C₁₀H₈ of the choices is soluble in CCl₄ since they are both non-polar by nature and related substances dissolve similarly. C₁₀H₈ is therefore disregarded.

Density:

There are now only three possibilities left. SiO₂, FeCl₃, and NaCl. The student discovered that the material has a density of 2.20 g/ ml. This is quite similar to sodium chloride's density (i.e., 2.165 g/mL). As a result, sodium chloride is most likely the material the student is working with.

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The kinetic energy of electrons emitted from chromium surface is determined as  2.9  x 10⁻¹⁹ J.

The energy of the emitted photon is calculated as follows;

E = hf

E = hc/λ

where;

E = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (200 x 10⁻⁹)

E = 9.94 x 10⁻¹⁹ J

Φ = 4.4 x 1.6 x 10⁻¹⁹

Φ = 7.04 x 10⁻¹⁹ J

E = K.E + Φ

K.E = E - Φ

K.E = 9.94 x 10⁻¹⁹ J - 7.04 x 10⁻¹⁹ J

K.E = 2.9  x 10⁻¹⁹ J

Thus, the kinetic energy of electrons emitted from chromium surface is determined as  2.9  x 10⁻¹⁹ J.

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Taking into account the definition of density, the density of the steel ball is 7.99 g/cm³.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷volume

Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

density= 1.765 g÷0.2209 cm³

Solving:

density= 7.99 g/cm³

In summary, the density of the steel ball is 7.99 g/cm³.

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The statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.

The average atomic mass could be obtained as the sum of the products of the percentage abundance of each of the hydrogen isotopes and the mass of the isotope.

We know that every element has isotopes. In every sample of the atom, there are various isotopes of the element. Thus the average atomic mass must take into account the masses of all these isotopes.

As such, the statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.

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Answer:

197.5 grams

Explanation:

To find the mass (g) of the sample, you need to multiply the given volume (mL) by the denisty. You can use the denisty to convert between mL and g because the denisty is a ratio which represents the mass of the sample per every 1 mL. The ratio should be arranged in a way that allows for the cancellation of units (mL should be in the denominator).

Denisty = 7.9 grams/ 1 mL

   25 mL               7.9 grams
-----------------  x  ----------------------  =  197.5 grams
                                 1 mL

**The final answer is not written with the proper sig figs.

In the first picture, the person seems nervous and lacks confidence while in the second one the person appears confident.

Nonverbal communication is the transfer of information through body language, facial expressions, gestures, created space, and more.

body language is essential as it makes the communication process more efficient.

facial expression depicts the nervousness and confidence of the person.

gestures involve hand movements.

In the first picture, we can see that the person's posture is bent and looking below.

In the second picture, the person has a straight posture and looks parallel.

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Answer:

they're

Explanation:

solid, liquid and gas

Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles

A mole is defined as 6.02214076 × 10²³ of some chemical unit, be it atoms, molecules, ions, or others.

Given:

volume=9.8 mL

Density= 0.960 g/mL

Percent concentration of solution= 25%

mass of nickel chloride=1.85 g

mass = density * volume

mass = 0.950 g/ml * 9.8 ml

mass = 9.31g

Since it is a 25 % solution of Ethylenediamine

mass of  ethylenediamine in 25 moles

moles of ethylenediamine = [tex]\frac{2.33g}{60g/mol}[/tex]  =0.0388 moles

Thus, Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles.

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The total volume of sample with given density and mass of copper is 16.815 cm³.

volume of copper = mass / density

v =  10.00g / 8.92g/cm³

v = 1.121 cm³

So to calculate total of volume of given sample,

Total volume = Volume of copper x Volume of water

V = 1.121 x 15.0

V = 16.815 cm³

A solid shape's capacity is measured using volume, a three-dimensional quantity. It implies that a closed figure's volume determines how much three-dimensional space it can occupy. A derived unit called the cubic meter (m3) serves as the SI unit of volume. The cubic decimeter is referred to as a "liter" (L) (dm3).

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Hexane is an alkane with six carbon atoms.

Hexane is an organic substance having the chemical formula C6H14. It is a straight-chain alkane containing six carbon atoms. When pure, it is an odorless, colourless liquid with a boiling point of roughly 69 °C (156 °F). It is a broadly applicable non-polar solvent that is quite safe, mainly unreactive, affordable, and easily evaporable.

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The density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm is 1.11.

Density can be defined as the measurement of how tightly a material is pecked together. It is defined as mass per unit volume.

Its SI unit is g/cm3 .

Density can be expressed as

Density = mass/ volume  

Volume of metal block = length x width x height

                                      = 16.25 x 2.30 x 6.00

                                      = 224.3  ml

Density = 250.0 / 224.3 g/ml

             = 1.11 g/ml

Thus, the density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm is 1.11.

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The theoretical yield of titanium tetrafluoride is 2.79 g

We know that the theoretical yield is the yield of the product that we can obtain from the stoichiometry of the problem. We now have to go back to the reaction equation and write;

[tex]Ti(s) + 2F_{2} (g) --- > TiF_{4} (s)[/tex]

Number of Ti = 2.5g/48 g/mol = 0.052 moles

Number of moles of F2 =  1.7 g/38 g/mol  0.045 moles

If 1 mole of Ti reacts with 2 moles of F2

0.052 moles reacts with 0.052 moles * 2 moles/1 mole

= 0.10 moles

We can see that F2 is the limiting reactant

If 2 moles of F2 1 mole of [tex]TiF_{4}[/tex]

0.045 moles of F2 produces 0.045 moles * 1 mole/2 moles

=  0.0225 moles

Mass of titanium tetrafluoride = 0.0225 moles * 124 g/mol

= 2.79 g

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Answer:

Divide the time value by 1000

Explanation:

7 Ms = 0.007s

Answer: D I PROMISE

Explanation:

IVE TOOK THE TEST AND ITS D

The mole ratio of PbO2 to water is 1:2.

The mole ratio of PbO2 to water, PbO2:H2O, is 1:2 when the reaction stoichiometry is taken into consideration.

The appropriate reaction is:

2 PbSO4 + 2 H2O ⇒ Pb + PbO2 + 2 H2SO4

The following numbers of moles of each component are involved in the reaction according to reaction stoichiometry, which describes the relationship between the amounts of reagents and products in a chemical reaction:

1 mole Pb

1 mole of PbO2

H2SO4: 2 mol

2 moles of PbSO4

Water: 2 moles

Then, you can see that according to the reaction's stoichiometry, 1 mole of PbO2 produces 2 moles of water (H2O).

Therefore,the mole ratio of PbO2 to water is 1:2.

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Answer: C & D

Explaination:

C because the atomic number increases sequentially and also the nuclear charge

D because as you're moving down a column the valance electrons does not change, only the atomic radius does.

The book will move to the right.

Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!

Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"

h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w

If two forces acts in opposite directions on an object, they will cancel each other in magnitude. Thus if 7N force is applied to the right and 3 N to the left, the net force will be 4 N to the right. Hence, option b is correct.

Force is an external agent acts on a body to change it from the state of motion or rest. There are various kinds of force namely, frictional force, gravitational force, nuclear force, magnetic force etc.

The force acting on a body to displace from one position to other is called normal force. Frictional force is resistive force which resist the motion of a body.

If two force are acting on a body in same direction, then the resultant force be the sum of magnitudes of these force. If they are acting in opposite direction then the force will be cancelled from each other

Hence, Net force is the difference in magnitude and the direction of net force is the direction of the force which was greater in magnitude.

Therefore, here the net force on the body which undergone two opposite force of 7N to right and 3N to left is 4N to the right.

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Answer:

They represent electrons

Explanation:

The number of significant figures contained in the following values are as follows:

Significant figures are digits that is meaningful with respect to the precision of a measurement.

Significant figures are digits that is nonzero, followed by a nonzero digit, or (for trailing zeroes) justified by the precision of the derivation or measurement.

According to this question, the number of significant figures contained in the following values are as follows:

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E. The energy of an electron in the n = 15 energy state is determined as -9.6 x 10⁻²¹ J.

The energy of an electron in the n = 15 energy state is calculated as follows;

E = -13.6/n²

given n = 15

E = -(13.6/15²)

E = -0.06 eV

E = -0.06 x 1.6 x 10⁻¹⁹

E = -9.6 x 10⁻²¹ J

Thus, the energy of an electron in the n = 15 energy state is determined as -9.6 x 10⁻²¹ J.

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Answer:

A. Memory reconstruction

N5+ + 2e →N³

here Nitrogen gains electron so, its reduction half-reaction

20²- → 0₂

here oxygen loss electron so, its oxidation half-reaction

20² → 20₂ + 4e¯​

here oxygen loss electron so, its oxidation half-reaction

2N5+ + 4e¯ → 2N³

here nitrogen gains electron so, its reduction half-reaction

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