Which of the following statements are true about metallic bonds?

A. They hold together ionic bonds.

B. They bond a metal to a nonmetal.

C. They bond identical atoms together.

D. They hold together atoms with different electronegative.

Answer:

Deforestation due as a result of development

Explanation:

As economies advance the need for more space to put up more infrastructure increases. This leads to the clearing of forests leaving widespread bare lands as the one shown in the picture provided, that have the long term effect of desertification.  

Answer:

Option C= several cm of lead.

Explanation:

we know there are three types of radiations emit by the atoms to attain the stability. These three radiations are alpha, beta  and gamma. Gamma radiations are high energy radiations. These radiations are travel at the speed of light. Gamma radiations can penetrate into the many materials. These radiations are also used to treat the cancer.

These radiations can not be stopped by the single sheet of paper or the water. Lead is used for the protection  against gamma radiations because of its high molecular density. The lead apron are used by the person when treated with gamma radiations. Lead shields are also used in the wall, windows and doors of the room where gamma radiations are treated, in-order to protect the surroundings. While the sheet of aluminium is used to block the beta radiations.

Answer: cm of lead

Explanation: gradpoint (aluminum only stops alpha and beta)

Answer:

tetra-.

Explanation:

” mono-” indicates one,

“di-” indicates two,

“tri-” is three,

“tetra-” is four,

“penta-” is five,

“hexa-” is six,

“hepta-” is seven,

“octo-” is eight,

“nona-” is nine,

and “deca” is ten.

So, the right choice is: tetra-.

Answer:

A. Hydrogen compounds, solid rock, and metals

Explanation:

The Jovian planets, also referred to as outer planets, are the four planets that are in the outer half of the solar system. These planets are gas giants, and they are mostly made out of gases, having much larger sizes and masses than the terrestrial planets. The inner cores of these planets also differ from the cores of the terrestrial planets. The inner cores of these planets are made out of rocks, metals, and hydrogen compounds. In general their cores are the size of the Earth, though they are much more massive.

Answer: The inner core of the Jovian planets are made of: Hydrogen compounds, solid rock, and metals.

Answer:

Halogen / salt-former

Explanation:

Bromine is classified as an element in the 'Halogens' section which can be located in group 7 of the Periodic Table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts".

The reaction between Na2CO3 and Ca(NO3)2 to precipitate CaCO3 and NaNO3 is shown by balanced double diaplacement reaction.

Answer:

Na₂CO₃ + Ca(NO₃)₂ → CaCO₃ + 2NaNO₃

Explanation:

The unbalanced reaction is:

Na₂CO₃ + Ca(NO₃)₂ → CaCO₃ + NaNO₃

Na₂CO₃ + Ca(NO₃)₂ → CaCO₃ + 2NaNO₃

The reaction is now balanced.

Answer:

0.7692 M ≅ 0.77 M.

Explanation:

(MV) before dilution = (MV) after dilution.

M before dilution = 2.0 M, V before dilution = 0.25 L.

M after dilution = ??? M, V after dilution = 0.25 L + 0.40 L = 0.65 L.

∴ M after dilution = (MV) before dilution/(V) after dilution = (2.0 M)(0.25 L)/(0.65 L) = 0.7692 M ≅ 0.77 M.

Answer: 650 moles

Explanation: so converted in grams just to make it easy for me, its 5850 g of water right, which is 325 moles of water

so here's the balanced equation

MgCl2 + H20 ==> 2HCl + MgO

thus 1 mole of h20 gives us 2 moles of hcl, so 325 x 2 = 650 moles of hcl

desertification, urbanization, and climate change(more carbon dioxide).

Answer:

Desertification and climate change and urbanization

Answer:

B) There is more water in the air because the rate of evaporation increases

Explanation:

As the temperatures rise across the globe, the rate of evaporation also increases, resulting in more water in the air. The reason for the increased evaporation is that the ice sheets and glaciers are melting, thus there's more liquid water. The more liquid water there is, the more evaporation there will be. As the evaporation increases, there will be an increase in the formation of clouds, thus there will be more precipitation around the world, gradually leading to warmer and wetter climate.

The

balanced reaction is:

2LiOH + CO2 = Li2CO3 + H2O

We

are given the amount of the reactants to be reacted. This will be the starting point of our

calculations. To determine the limiting reactant, we convert the amounts from grams to moles.

1.000 × 10^3 g LiOH  (1 mol / 25.95 g) = 38.54 mol LiOH

8.80 × 10^2 g CO2 ( 1mol / 44.01 g) = 20.00 mol CO2

From the balanced reaction, the molar ratio of the reactants is 2:1. This means that every two mole of lithium hydroxide, 1 mole of carbon dioxide is needed. It is clear that, from the given amounts, CO2 is the limiting reactant.

Answer: The limiting reagent is carbon dioxide and theoretical yield of the reaction is 360 g.

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]      .....(1)

Given mass of LiOH = [tex]1.00\times 10^3g[/tex]

Molar mass of LiOH = 23.95 g/mol

Putting values in equation 1, we get:

[tex]\text{Moles of LiOH}=\frac{1.00\times 10^3g}{23.95g/mol}=41.75mol[/tex]

Given mass of carbon dioxide = [tex]8.8\times 10^2g[/tex]

Molar mass of carbon dioxide = 44 g/mol

Putting values in equation 1, we get:

[tex]\text{Moles of carbon dioxide}=\frac{8.8\times 10^2g}{44g/mol}=20mol[/tex]

[tex]2LiOH(s)+CO_2(g)\rightarrow Li_2CO_3(s)+H_2O(l)[/tex]

By Stoichiometry of the reaction:

1 moles of carbon dioxide reacts with 2 moles of lithium hydroxide.

So, 20 moles of carbon dioxide will react with = [tex]\frac{2}{1}\times 20=40mol[/tex] of lithium hydroxide.

As, given amount of lithium hydroxide is more than the required amount. So, it is considered as an excess reagent.

Thus, carbon dioxide is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of carbon dioxide produces 1 mole of water

So, 20 moles of carbon dioxide will produce = [tex]\frac{1}{1}\times 20=20moles[/tex] of water

Molar mass of water = 18 g/mol

Moles of water = 20 moles

Putting values in equation 1, we get:

[tex]20mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=360g[/tex]

Hence, the limiting reagent is carbon dioxide and theoretical yield of the reaction is 360 g.

The mass of nitric acid that can be produced from 405 g of ammonia is approximately 1500 g, when rounded to three significant figures.

To determine the mass of nitric acid that can be made from 405 g of ammonia, we first need to write the balanced chemical equation for the reaction between ammonia and oxygen:

4NH3 + 5O2 -> 4HNO3 + 6H2O

This equation tells us that 4 moles of ammonia (NH3) react to produce 4 moles of nitric acid (HNO3).

The molar mass of ammonia (NH3) is approximately 17.03 g/mol. Therefore, 405 g of ammonia is equivalent to 23.77 moles (405 g / 17.03 g/mol). So, we can produce the same amount of moles of nitric acid (23.77 moles).

The molar mass of nitric acid (HNO3) is approximately 63.01 g/mol. Therefore, the mass of nitric acid that can be made from 405 g of ammonia is approximately 1497 g (23.77 moles x 63.01 g/mol). This value should be reported to three significant figures: 1500 g.

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Answer:

[tex]\boxed{\text{2.0 atm}}[/tex]

Explanation:

If the temperature is constant, the only variables are pressure and volume, so we can use Boyle’s Law.

p₁V₁ = p₂V₂

Data:

p₁ = 4.4 atm; V₁ = 32.14 L

p₂ = ?;           V₂ = 72     L

Calculation:

4.4 × 32.14 = p₂ × 72

141 = 72p₂

[tex]p_{2} = \dfrac{141}{72} = \textbf{2.0 atm}[/tex]

The new pressure is [tex]\boxed{\textbf{2.0 atm}}[/tex]

Answer: D. an open series circuit

If the volume increases then the pressure would decrease.

Answer:  So if the volume increases, the pressure decreases. ... Boyle's law states that for a fixed amount of gas in an enclosed system at constant temperature, pressure and volume are inversely proportional

Explanation:

This linear relationship between pressure and volume means doubling the volume of a given mass of gas decreases its pressure by half.

PV = c

or

P ∝ 1/V

Answer:

1st answer:  A. Graphite

2nd answer:  B.  Mercury

Explanation:

Answer:

Explanation:

The most common way to solve this kind of problem is to use the formula  

In your problem,

For NaOH

C₁ =??     v₁= 78.0 mL = 0.078 L

For H₂SO₄

C₁ =1.25 M     v₁= 50.0 mL = 0.05 L

but you must note that for the reaction of NaOH with H₂SO₄

2 mol of NaOH raect with 1 mol H₂SO₄

So, by applying in above formula

So, the answer is the concentration of an NaOH = 1.6 M

The frozen balloon shrank because the average kinetic energy of the gas molecules in a balloon decreases when the temperature decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon, which causes the balloon to shrink a little.

Potential energy  thats what i think anyone else got a diffrent answer

Increasing the average kinetic energy of a material's particles raises the temperature, which in turn raises the substance's internal thermal energy.

When the temperature of a material is increased, this results in an increase in the average kinetic energy of the particles composing that material. As the average kinetic energy goes up, the temperature of the substance rises. Consequently, if a substance's temperature is elevated, its internal energy also goes up, which can be observed as an uptick in both the kinetic and potential energies of the particles in the material.

Therefore, when we discuss an increase in kinetic energy, we are generally referring to an increase in thermal energy

Specifically, in the context of a chemical reaction, higher kinetic energy means that the molecules are moving more rapidly, resulting in more frequent and more energetic collisions. Even though an increase in collision frequency does not guarantee a reaction will occur, it does increase the probability that the molecules will bump into each other with the necessary orientation and energy to react. This, in turn, can increase the rate of the reaction.

Answer:

492.3 cm³.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(V₁T₂) = (V₂T₁).

V₁ = 417.0 cm³, T₁ = 65°C + 273 = 338 K.

V₂ = ??? cm³, T₂ = 126°C + 273 = 399 K.

∴ V₂ = (V₁T₂)/(T₁) = (417.0 cm³)(399 K)/(338 K) = 492.3 cm³.

Answer:

492.3 cm³.

Explanation:

The answer is in the photo.

Answer:

3.56 %

Explanation:

Percent composition of NaCl =  [tex]\frac{mass of NaCl}{mass of sea water  }[/tex] x 100

Mass of sea water = 520 g  

Moles of NaCl = 0.317  mol

Molar mass of NaCl = 58.44 g/mol

Mass of NaCl = moles of NaCl x Molar mass of NaCl  

                       =   0.317  mol x 58.44 g/mol  = 18.52 g

Percent composition of NaCl = [tex]\frac{18.52 g}{520 g}[/tex]  x 100 = 3.56 %

Answer:

It is difficult to safely transport and store hydrogen gas before it is used.

Explanation:

A mixture of hydrogen gas and oxygen causes an explosive reaction. Any minimal leak would mean a fire hazard. If it was in a series of storage equipment, a single explosion would lead to a series of other explosions that would lead to a massive loss of property and possibly, life.

Answer:

Widespread use of fuel cell vehicles poses a danger because

it is difficult to safely transport and store hydrogen gas before it is used.

Explanation:

A furl cell is used in a fuel cell vehicle instead of a battery.

By the use of Oxygen and compressed hydrogen electricity is generated to give power to the motor. The transportation and the process of storing hydrogen create pollutants.  The primary energy which helps in the production of hydrogen is the main aspect on which the impact of the fuel cell depends upon.

Answer: -345.2 KJ

Explanation: As we know that ,dG=dH-TdS

T=25+273=298 K

dG= -356 x1000-298(-36)= -356000+10728

=-345272 j

= -345.2 KJ

The relative density of ozone will be 1.5

Answer:

0.4444 g/cm³ ≅ 0.44 g/cm³ (2 significant figures).

Explanation:

d = m/V,

where, d is the density of the material (g/cm³).

m is the mass of the material (m = 28 g).

V is the volume of the material (V = 63.0 cm³).

∴ d = m/V = (28 g)/(63.0 cm³) = 0.4444 g/cm³ ≅ 0.44 g/cm³ (2 significant figures).

Answer:

3718.628 kPa.

Explanation:

where, P is the pressure of the gas in atm (P = ??? atm).

V is the volume of the gas in L (V = 2.0 L).

n is the no. of moles of the gas in mol (n = 3.0 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 298.0 K).

∴ P = nRT/V = (3.0 mol)(0.0821 L.atm/mol.K)(298.0 K)/(2.0 L) = 36.7 atm.

∵ 1.0 atm = 101.325 kPa.

∴ P = (36.7 atm)(101.325 kPa/1.0 atm) = 3718.628 kPa.

Answer: Option (D) is the correct answer.

Explanation:

Bases are the substances that release hydroxide ions when dissolved in water.

A strong base will dissociate completely in water and give more number of hydroxide ions [tex](OH^{-})[/tex]. Whereas a weak base will slightly dissolve to give hydroxide ions [tex](OH^{-})[/tex] in water.

So, a strong base will have high electrical conductivity and a weak base will have low electrical conductivity.

Since, both are bases (strong base and weak base) therefore, both of them will have bitter taste, slippery texture and they will turn red litmus into blue.

Hence, we can conclude that electrical conductivity tests could be safely used to distinguish a strong base from a weak base.

Litmus paper tests could be safely used to distinguish a strong base from a weak base. The correct answer is C.

To distinguish a strong base from a weak base, one can use litmus paper as a safe and effective method. Litmus paper is a pH indicator that changes color in response to the acidity or basicity of a solution.

When a strong base, such as sodium hydroxide (NaOH), comes into contact with litmus paper, it will cause a dramatic color change, typically from red to blue in the case of blue litmus paper.

This is because strong bases have a high concentration of hydroxide ions (OH-) and can rapidly accept protons (H+), leading to a significant increase in pH.

On the other hand, a weak base, such as ammonia (NH3), will also cause a color change but to a lesser extent or more slowly, reflecting its lower ability to accept protons compared to a strong base.

The pH change will be less dramatic, and the color change on the litmus paper may be less pronounced or take longer to occur.

The other options are not suitable for distinguishing between strong and weak bases:

A. Taste -

Tasting chemicals is extremely dangerous and should never be done. It does not provide a safe method to distinguish between strong and weak bases.

B. Touch -

While some bases may feel slippery or soapy to the touch due to the formation of soap-like substances when they react with oils on the skin, this method is not safe and does not provide a clear distinction between strong and weak bases.

D. Electrical conductivity -

Both strong and weak bases can conduct electricity if they are ionic and dissociate into ions in solution. Therefore, electrical conductivity cannot be used to distinguish between the strength of bases.

In summary, litmus paper is the safest and most reliable method among the options provided to distinguish a strong base from a weak base based on the degree of color change and the speed of the reaction.

Answer:

37.25 grams/L.

Explanation:

M = (no. of moles of KCl)/(volume of the solution (L))

∵ no. of moles of KCl = (mass of KCl)/(molar mass of KCl)

∴ M = [(mass of KCl)/(molar mass of KCl)]/(volume of the solution (L))

∴ (mass of KCl)/(volume of the solution (L)) = (M)*(molar mass of KCl) = (0.5 M)*(74.5 g/mol) = 37.25 g/L.

So, the grams/L of KCl = 37.25 grams/L.

In a 0.5 M KCl solution, there are 0.5 moles of KCl per liter. Given the molecular weight of KCl is 74.5 g/mol, this would translate to 37.25 grams of KCl per liter.

If you have a 0.5 M KCl solution, this means that the concentration of KCl in the solution is 0.5 moles per liter. To find the amount of solute in moles, you would simply use the concentration of the solution and the volume of the solution. In this case, if you have a 1-liter solution, you will have 0.5 moles of KCl, since the concentration is 0.5 M.

To convert this amount in moles to grams, you will need to use the molecular weight of KCl, which is given as 74.5 g/mol. By multiplying the number of moles by the molecular weight, you get the grams of the solute:

0.5 moles × 74.5 g/mol = 37.25 grams of KCl

Therefore, in a 1-liter solution of 0.5 M KCl, you would have 37.25 grams of KCl.

The lithium atom provides the fluorine atom with one electron making both atoms stable. Fluorine has a better positive charge than lithium so fluorine will attract the electron. Now, the atoms fuse together to form an ionic bond and making lithium fluoride. Ionic bonds are caused by the attraction between two forces of atoms.

Answer:

The lithium atom has one electron in its outer shell, so it loses that one electron and becomes a [tex]Li^{1+}[/tex] ion. The fluorine atom has 7 electrons in its outer shell so it gains that one electron and becomes a [tex]F^{1-}[/tex] ion. The electrostatic force of attraction between the two ions, because of their charges, bonds them together in an ionic bond to make [tex]LiF[/tex], Lithium Fluoride.

Couldn't add a diagram, but hope it helps.