Ionic compounds can conduct electricity when dissolved in water due to the presence of free floating ions.
True or False

Answer:

2g/cm³

Explanation:

Given parameters:

Mass of rock  = 6g

Volume of rock  = 3cm³

Unknown:

Density of rock  = ?

Solution:

Density is the mass per given volume of a substance. It can be mathematically expressed as:

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

 Insert the parameters and solve;

      Density  = [tex]\frac{6}{3}[/tex]   = 2g/cm³

Explanation:

Cellulose fibers, structural proteins, and other polysaccharides help to maintain the shape and form of the cell. Additional functions of the cell wall include: Support: The cell wall provides mechanical strength and support. It also controls the direction of cell growth.

Answer:

63.53% yield

Explanation:

The balanced equation for this reaction is 2NaCl + H2O -> 2NaOH +Cl2

First we must find the limiting reactant

From NaCl we can only produce 6.06 grams of Cl2 in theory

From H20 we can only produce 38.995 grams in theory

so we know NaCl is the limiting

% yield is (Actual/Theoretical) x100 so

(3.85/6.06)x100= 63.53% yield

The percent mass of lead in tetraethyl lead is 64.1%.

The percent by mass of an element in a compound is determined by taking the ratio of the atomic mass of the element and the molar mass of the compound and then multiply by 100%

atomic mass of Pb = 207

atomic mass of C = 12

atomic mass of H = 1

Molar mass of  tetraethyl lead: 207 + 12 * 2 * 4  + 1 * 5 * 4

Molar mass of  tetraethyl lead = 323 g/mol

Percent mass of Pb = 207/323 × 100%

Percent mass of Pb = 0.6408 × 100%

Percent mass of Pb = 64.1%

In conclusion, the percent mass of lead in tetraethyl lead is 64.1%.

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Answer:

True

True

Temperature

Explanation:

Answer:

the answer is your a awesome person

Answer:

Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.

Explanation:

will this help you

Answer:

1.99grams

Explanation:

- First, we need to calculate the molar mass of the compound: Ca(HCO3)2

Ca = 40g/mol, H = 1g/mol, C = 12g/mol, O = 16g/mol

Hence, Ca(HCO3)2

= 40 + {1 + 12 + 16(3)}2

= 40 + {13 + 48}2

= 40 + {61}2

= 40 + 122

= 162g/mol

Molar mass of Ca(HCO3)2 = 162g/mol

- Next, we calculate the mass of oxygen in one mole of the compound, Ca(HCO3)2.

Oxygen = {16(3)}2

= 48 × 2

= 96g of Oxygen

- Next, we calculate the percentage composition of oxygen by mass by dividing the mass of oxygen in the compound by the molar mass of the compound i.e.

% composition of O = 96/162 × 100

= 0.5926 × 100

= 59.26%.

- The number of moles of the compound, Ca(HCO3)2, must be converted to mass by using the formula; mole = mass/molar mass

0.0207 = mass/162

Mass = 162 × 0.0207

Mass = 3.353grams

However, in every gram of Ca(HCO3)2, there is 0.5926 g of oxygen

Hence, in 3.353grams of Ca(HCO3)2, there will be;

0.5926 × 3.353

= 1.986

= 1.99grams.

Therefore, there is 1.99grams of Oxygen in 0.0207 moles (3.353g) of Ca(HCO3)2.

The acceleration of the cylinder in m/s2 is 0.973 meters per seconds squared.

Acceleration is the change of velocity with time. The unit is usually meters per seconds squared.

mass = 4.3 kg

radius = 0.4m

angle of inclination, ∅ = 0.15 radians

acceleration of the cylinder in m/s^2

= ( g + sin ∅ ) / 1 + 0.5

= ( 9.81 + sin 0.15 ) / 1.5

take note angle is in radians not degrees

= 1.46 / 1.5

= 0.973 meters per seconds squared

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The specific heat of the metal : 0.384 J/g° C,

and a metal with a specific heat of 0.384 is copper

The law of conservation of energy can be applied to heat changes, i.e. the heat received / absorbed is the same as the heat released  

Q in = Q out  

Q lost(metal) = Q gained(water)

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

[tex]\tt Q~metal=Q~water\\\\8.5\times c\times (100-23.2)=50\times 4.18\times(23.2-22)\\\\652.8\times c=250.8\Rightarrow c=\dfrac{250.8}{652.8}=0.384~J/g^oC[/tex]

Answer:

Muscular, and aerobic

Explanation:

the answer is bat and person

Answer:

divergent boundaries- volcanic activity, shallow earthquakes, new sea floor.

convergent boundaries- earthquakes, volcanoes, formation of mountains.

transform boundaries- earthquakes, crustal deformation

Explanation:

(hope this helped!!)

In the given question, the sulphuric acid which is needed to be produced is 408.333 Litres. NaCl + H₂SO₄ → HCl + NaHSO₄

This question is based on stoichiometry, in which we first balance the equation, equate the moles or the masses of elements and using the mole ratio or mass ratio, find the given amount of weight or moles of the desired element from the reaction. Stoichiometry helps us to predict the reaction components that how much it participates in the reaction, how much we the get the product or how much reactant is left. So, in the given question,
Equating the Molar masses: 58 + 98 → 36 + 120. Mass of HCl =[tex]500*0.8= 400[/tex] kg. Balancing the mass:

[tex]400[(58/120)+(98/120)][/tex] → [tex]400[(36/120)+(120/120)][/tex]

Volume of H₂SO₄ 80% = [tex]400 * (98/120)] /0.8= 408.333[/tex]

The final answer is 408.333 Litres. This was solved using Stoichiometry.

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Answer:

i think c

Explanation:

:D

Answer:

17 protons, 20 neutrons, and 17 electrons​.

Explanation:

A periodic table can be defined as the standard arrangement of chemical elements by atomic number, electronic configuration and chemical properties in a tabular form.

Generally, a proper representation of the mass number and atomic number of chemical elements is key and very important in chemistry.

Furthermore, as a rule, it should be noted that the mass number (nucleon number) is always larger than the atomic number(number of proton).

The mass number of this neutral atom of Cl-37 is 37 and we know that the atomic number (number of protons) of chlorine is 17. Also, the atomic number of an element is equal to the number of its electrons.

A neutral atom of Cl-37 has 17 protons, 20 neutrons, and 17 electrons.

Hence, a neutral atom of Cl-37 can be identified based on its number of protons because it represent its atomic number, which is what is used to differentiate an atom of an element from the atom of another chemical element.

When 25.0g of Zn reacts, mols of HCl are consumed 0.7648 moles HCl

Write down the balanced chemical equation for this one replacement reaction first.

Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)↑⏐

Now take note of the 2:1 mole ratio of reaction between the two reactants. This demonstrates that the reaction will always use up two times as much hydrochloric acid as zinc metal.

As you are aware, a solution's molarity indicates the number of moles of solute—in your case, hydrochloric acid, HCl—that are present in one liter of the solution.

The molarity of the hydrochloric acid solution is reported to be

3.05 mol L−1. This indicates that for every 1 L of solution, 3.05 moles of hydrochloric acid are produced. Remember this for later. You are aware that the reaction needs 25.0 g of zinc.

By using the molar mass of zinc, you can convert this mass to moles.

25 g per mole Zn

65.38g = 3.824 moles of zinc

n order for this many moles of zinc to react, you'd need

0.3824moles Zn⋅2amoles

HCl 1 mole Zn=0.7648 moles HCl

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Answer:

1.67 moles

Explanation:

From the balanced equation of reaction:

                     [tex]SO_2 + 2H_2S -> 3S + 2H_2O[/tex]

1 mole of sulfur dioxide, SO2, is required to produce 3 moles of sulfur, S.

If 1 mole SO2 = 3 moles S, then, how many moles of SO2 would be required for 5 moles S?

     Moles of SO2 needed = 5 x 1/3

                   = 5/3 or 1.67 moles

Hence, 1.67 moles of SO2 would be required to produce 5.0 moles of S.

Answer: 1.7

Explanation:

Answer:

Charles's law

Explanation:

The chemical equation given is that of Charles's law;

  The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant"

      mathematically;

              v ∝  T ( P, n constant)

So;

        V1/T1 = V2/T2

V and T are volume and temperature values

1 and 2 are initial and final states

Answer:

0.1 dm³.

Explanation:

To obtain the value of 100 cm³ in dm³, do the following:

Recall:

1 cm³ = 0.001 dm³

Therefore,

100 cm³ = 100 cm³ × 0.001 dm³ / 1 cm³

100 cm³ = 0.1 dm³

Thus, 100 cm³ is equivalent to 0.1 dm³.

Answer:

1.08 g of water

Explanation:

The balanced chemical equation for the reaction of combustion of methane (CH₄) is the following:

CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

According to the equation, 1 mol of CH₄ reacts with 2 moles of O₂. We convert from mol to grams by using the molar masses:

1 mol CH₄ = (1 x 12 g/mol) + (4 x 1 g/mol) = 16 g

2 mol O₂ = 2 x (2 x 16 g/mol) = 64 g

2 mol H₂O = 2 x ((2 x 1 g/mol) + 16 g/mol)= 36 g

From the masses of reactants (CH₄ and O₂), we can see that the stoichiometric ratio is 64 g O₂/16 g CH₄ = 4.

First, we have to identify which reactant is the limiting reactant. We can compare the stoichiometric ratio with the actual reactants ratio (the masses of reactants we have):

1.92 g O₂/0.80 g CH₄ = 2.4

As 4>2.4, we can conclude that O₂ is the limiting reactant.

Now, we consider the stoichiometric ratio between the limiting reactant (64 g O₂) and the product we have to calculate (36 g H₂O), and we multiply the ratio by the actual mass of O₂:

1.92 g O₂ x 36 g H₂O/64 g O₂ = 1.08 g

Therefore, 1.08 g of H₂O will be produced by the chemical reaction of 0.80 g of methane with 1.92 g of oxygen.

Answer:

Products

Explanation:

Answer:

it can last for 30 minutes

Explanation:

because it is very good at giving off heat, extothermal heat can last for quite a while.

Answer:

3

Explanation:

fe is iron ,O is oxygen and C is carbon

Answer:

I

Explanation:

The complete question can be seen in the image attached.

We need to understand what is actually going on here. In the first step that yields product A, the sodamide in liquid ammonia attacks the alkyne and abstracts the acidic hydrogen of the alkyne. The second step is a nucleophilic attack of the C6H5C≡C^- on the alkyl halide to yield product B (C6H5C≡C-CH3CH2).

Partial reduction of B using the Lindlar catalyst leads to syn addition of hydrogen to yield structure I as the product C.

it is still available please let us know

Answer:

Cooling causes contraction and shifting of the fluid particles in the lithosphere.

Answer:

The 2 answer

Explanation:

The final temperature : 78.925°C

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

Energy releases = 130 kcal = 130 x 4.18 kJ=543.4 kJ

The final temperature :

[tex]\tt \Delta T=\dfrac{Q}{m.c}\\\\\Delta T=\dfrac{543.4}{2.5\times 4.186~kJ/kg^oC}\\\\\Delta T=51.925^oC[/tex]

Final temperature :

ΔT=final-initial

51.925°c=final-27°c

final = 51.925+27=78.925°C

Answer:

temperature

amount

Explanation:

Under the postulate of Boyle's law, both temperature and amount(number of moles) are kept constant.

  According to Boyle's law "the volume of a fixed mass of gas varies inversely as the pressure changes if the temperature is constant"

 Based on the premise of this law, both temperature and amount of substance is kept constant.