Which of the following is true about metallic bonds?
o A. Electrons are strongly attracted to the nucleus.
B. Electrons of metals are always shared.
C. Electrons are highly stable.
O
D. Electrons are delocalized.

Answer:

The correct answer is a

Explanation:

The formula for density is mass ÷ volume. Hence, a balance is required to determine the mass while a measuring/graduated cylinder is required to determine the volume.

The ideal measuring cylinder and balance to be used should have an uncertainty of just 0.1 ml and 0.1 g respectively. This reduces the chances of the answer gotten from the formula above to be more than 3 significant figures.

For example, if the volume to be used is 4.0 ml and the mass of this volume is 3.5 g, the density will be

Density = 3.5 ÷ 4

Density = 0.875 g/cm³ or 0.875 g/ml

NOTE that cm³ is the same measurement as mL

The answer above is in 3 significant figures

Answer:

Red, because it has less volume and more amount of matter.

Explanation:

the answer is "Green, because it has less volume and less amount of matter."

Answer:

What is the question? ...

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 620 g

volume = 850 mL

We have

[tex]density = \frac{620}{850} \\ = 0.7294117647...[/tex]

We have the final answer as

Hope this helps you

Answer:

68 °C.

Explanation:

Hello.

In this case, since the relationship between the altitude and the boiling point is inversely proportional due to fact that the higher the altitude the lower the atmospheric pressure and therefore the lower the boiling point (temperature) and the lower the altitude the higher the atmospheric pressure and therefore the higher the boiling point. This is supported by the fact that at lower atmospheric pressures, more liquid molecules are likely to become gas since a weaker force is holding them together in liquid state and the other way around.

Therefore, the most likely boiling point at 3,000 m up a mountain will be below 78 °C, it means 68 °C.

Best regards.

The most likely boiling point for this substance at an elevation of 3,000 meters up a mountain is: A. 68°C.

Given the following data:

To determine the most likely boiling point for this substance at that elevation:

Boiling point can be defined as the temperature at which a physical matter changes phase or state, especially from liquid to gas.

The boiling point of a substance is inversely proportional to altitude due to the effect of atmospheric pressure.

This ultimately implies that, the higher the altitude, the lower the boiling point and the lower the altitude, the higher the boiling point.

In this context, the boiling point of a substance at higher altitude such as on a mountain is lower because there is less atmospheric pressure acting on its molecules.

Deductively, the most likely boiling point for this substance at an elevation of 3,000 meters up a mountain would be less than 78°C.

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Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual number = 200 g

error = 200 - 196.5 = 3.5

We have

[tex]p(\%) = \frac{3.5}{200} \times 100 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

According to the law of conservation of mass, the mass of reactants will be equal to the mass of the products.

Explanation:

Answer:

Explanation:

1 ) The solubility can be calculated .

The sample taken from the pool was a saturated solution of mineral compound X because the pool was lined with the crystals of X .

The sample taken was 25 mL . Though it diluted afterwards , the solute contained in it did not change . The solute X was found to be 3.00 g

2 )

3 .00 g of solute X  was contained in 25 mL of saturated solution .

solubility of X = 3 / 25 g  per mL

= 3 x 1000 / 25 g per L

= 120 g / L

= 1.20 x 10² g / L

Answer:

1

[tex]k = 32.5 \% [/tex]

2

[tex]z =63.56 \%[/tex]

3

[tex]m_t = 3.40 \ g[/tex]

4

[tex]j =  96.05 \%[/tex]

5

[tex]e = 3.954 \%[/tex]

Explanation:

From the question we are told that  

   The mass of the sample  is  [tex]m =   3.54 \   g[/tex]

    The mass of the AgNO3 is  [tex]m_s  = 1.15 g[/tex]

   The mass of  Mg(OH)2 is  [tex] m_n= 2.25 g[/tex]

Generally the percentage of AgNO3 in the mixture is  

          [tex]k = \frac{1.15}{3.54}  * 100[/tex]

=>        [tex]k = 32.5 \% [/tex]

Generally the percentage of Mg(OH)2 in the mixture is  

           [tex]z = \frac{m_n}{m}  * 100[/tex]

=>         [tex]z = \frac{2.25}{3.54}  * 100[/tex]

=>           [tex]z =63.56 \%[/tex]

Generally the total mass of   the AgNO3 and Mg(OH)2 recovered is  

      [tex][tex]m_t  =  m_s +m_n[/tex]

=>    [tex]m_t  =   1.15 +2.25[/tex]  

=>    [tex]m_t = 3.40 \ g[/tex]

Generally the percentage recovery of the components is mathematically represented as

       [tex]j =  \frac{m_t}{m} * 100[/tex]

=>     [tex]j =  \frac{3.40}{3.54} * 100[/tex]

=>     [tex]j =  96.05 \%[/tex]

Generally the percentage error for the separation of the components of the mixture is mathematically represented as  

      [tex]e =  \frac{m- m_t}{m} * 100[/tex]

=>    [tex]e =  \frac{3.54 - 3.40}{3.54} * 100[/tex]  

=>    [tex]e = 3.954 \%[/tex]  

Answer:

24

Explanation:

Answer:

601mmhg

Explanation:

Pgas = Patm - hρg

Height of water = 14.4cm

Convert to mm

1 cm = 10mm

14.4 cm =

= 14.4cm × 10mm

= 144mm

hpg = 144 mmhg

Ptotal = Patm - hog

= 745mmhg - 144 mmhg

= 601mmhg

The total pressure of gases inside the graduated cylinder = 601mmhg

Answer:

Graduated cylinder vs Beaker

Both graduated cylinders and beakers are pieces of laboratory glassware that have a specific function. Graduated cylinders typically are more accurate at reading the volumes of the liquid inside. Beakers are better for stirring and mixing liquids

Explanation:

Answer:

3 x 9 x 2 = 54 meters

10 x 4 x 7 = 280 meters

Explanation:

Multiply the length, the width, and the height.

You can multiply them in any order to get the same different result. The formula for finding the volume of a rectangular prism is the following: Volume = Length * Height * Width, or V = L * H * W.

Answer:35 cubes with a length of 7 meters, height of 1 meter, and width of 5 meters.

What is the length of the figure?

✔ 7 m

What is the width?

✔ 5 m

What is the height?

✔ 1 m

What is the number of cubes?

✔ 35 cubes

What is the volume?

✔ 35 cubic meters

Explanation:

Answer:

Single-celled organisms are able to carry out all the processes of life without help from other cells. Multicellular organisms carry out their life processes through division of labor. They have specialized cells that do specific jobs.

Explanation:

that might be the answer

Answer:

All single-celled organisms contain everything they need to survive within their one cell. These cells are able to get energy from complex molecules, to move, and to sense their environment. The ability to perform these and other functions is part of their organization.

Hope it helps

Explanation:

Answer:

Are there suppose to be answer choices?

Explanation:

Answer:

well when you go and open a water bottle 2 put force spanner to rotate a nut. 3 a door whey you are opening it

Explanation:

let me now if all of this answers where helpful

Answer:

[tex][A]=0.0026M[/tex]

Explanation:

Hello.

In this case, since the second-order rate law is:

[tex]\frac{dC_A}{dt}=-kC_A^2[/tex]

Whereas the subscript A accounts for C2F4 and its integration turns out into:

[tex]\frac{1}{[A]}= \frac{1}{[A_0]} +kt[/tex]

Thus, for the initial concentration of C2F4 computed via the 0.1 mol in the 2.31-L container:

[tex][A]_0=\frac{0.1mol}{2.31L} =0.043M[/tex]

The final concentration after 2.1 h is:

[tex]\frac{1}{[A]}= \frac{1}{0.043M} +\frac{0.048}{M*s} *\frac{3600s}{1h}*2.1h\\\\\frac{1}{[A]}=\frac{386.1}{M}[/tex]

Solving for the final concentration of C2F4, we obtain:

[tex][A]=\frac{M}{386.1} =0.0026M[/tex]

Best regards.

Answer:

why cant you just say the grasshopper eats the marsh grass the shrew eats the grasshopper and the hawk eats the shrew.

Explanation:

this makes sense to me but im not sure.

Answer:

the hawk eats both the snake and the shrew and so does the snake eat the shrew and frog and ex...

Explanation:

Answer:

A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.

Explanation:

Answer:

i believe it to be B. but hope it helps

Explanation:

sorry if im wrong

The possible products will form as a solid in this reaction (NH4)2S. The correct option is D.

The double displacement reaction is the reaction in which two reactants create two new compounds by exchanging ions. Precipitates are frequently formed as a byproduct of double displacement processes. One element from the solution and another elements form a precipitate.

According to rules of solubility, the sulfides are usually not soluble in water and sodium nitrate is readily soluble in water, so it is clear that the precipitate is formed by the sulfide group. The solution will be formed by sodium nitrate.

Thus, the correct option is D.  (NH4)2S.

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Answer:

If iron, Fe, and oxygen, O2, are in contact at high enough temperatures (and with plenty of oxygen around), the grey or reddish compound that forms is called iron(III) oxide with the formula Fe2O3

Explanation:

Iron rusts. We all know that. But the chemical reactions behind rust are surprisingly complicated! We will return to them at the end of the course when we discuss corrosion (see section 11.6 in the text). Here, we focus simply on the main compounds formed between iron and oxygen. That there is more than one may surprise you. That there are not an infinite number of them (and in fact, there almost is, as well shall see!) is an example of the law of definite proportion, an idea so central to chemistry it is almost taken for granted today.

Answer:

250mL

Explanation:

Answer:

-3.72 (or -3.70 depending on what values you used)

Explanation:

First, use the molar mass of Cl2 convert the mass of Cl2 to moles.

1.48 g Cl2(1 mol70.906 g)=0.02087 mol Cl2

Note that we are given ΔH=−886kJ. This refers to the enthalpy change associated with the reaction of 5mol of Cl2 by the balanced equation shown below.

2P+5Cl2⟶2PCl5ΔH=−886kJ

Therefore, to determine the enthalpy change associated with the reaction of 1.48gCl2, divide ΔH by 5molCl2 to determine the enthalpy change per mole of Cl2, then multiply by 0.02087 mol Cl2.  (note: if you round up here to .021 mol of Cl2 you will get the final answer of -3.72 later)

0.02087 mol Cl2(−886 kJ5 mol Cl2)=−3.698 kJ

Rounding the answer should to three significant figures, we find that the enthalpy change associated with the reaction of 1.48gCl2 is −3.70 kJ.

Notice that coefficients in stoichiometric equations (indicating numbers of moles) are exact, so they do not constrain the number of significant figures.

The enthalpy change for the reaction when 1.48 g of Cl₂ reacts with excess P is –3.69 KJ.

We'll begin by calculating the number of mole of in 1.48 g of Cl₂. This can be obtained as follow:

Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol

Mass of Cl₂ = 1.48 g

Mole = mass / molar mass

Mole of Cl₂ = 1.48 / 71

Finally, we shall determine the enthalpy change for the reaction. This can be obtained as follow:

2P + 5Cl₂ —> 2PCl₂  ΔH = −886 KJ

From the balanced equation above,

5 moles of Cl₂ reacted to produce an enthalpy change of −886 KJ.

Therefore,

0.0208 mole of Cl₂ will react to produce an enthalpy change of = [tex]\frac{0.0208 * - 886}{5}\\\\[/tex] = –3.69 KJ.

Thus, the enthalpy change for the reaction when 1.48 g of Cl₂ reacts with excess P is –3.69 KJ.

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Answer:

[tex]Total\ Distance = 190[/tex]

Explanation:

Given

[tex]Distance = \{30, 45, 50, 65\}[/tex]

Required

Determine the total distance

This is calculated by summing up the distance in each segment.

[tex]Total\ Distance = 30 + 45 + 50 + 65[/tex]

[tex]Total\ Distance = 190[/tex]