A physical change is when the form or shape of a substance changes, but
the chemical structure remains the same. *
True
False

Answer:

234.213

Explanation:

Moles of Nickel x 58.70 = Grams

3.99 x 58.70 = 234.213

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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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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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:

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:

The kinetic energy of 429 kJ and the specific heat of the substance is 9059 g kJ °C

The kinetic energy is given as ,

K.E = 1/2 m[tex]v^{2}[/tex]

Where m = mass = 1599 kg

v = velocity  = 83.4 km/h = 23 m/s

Putting the value mass and velocity in equation ( i ) we get ,

K.E = 1/2 × 1599 kg × 23 m/s × 23 m/s = 429074.86 J = 429 kJ

Specific heat is calculated as ,

Q = mcΔT

mass of the substance ( m ) = 56.87 g

c = 1475 J

ΔT = 138.4 °C - 30.0 °C = 108 °C.

Putting the value of mass , change in temperature and heat absorbed in equation ( ii ) we get ,

Q = 56.87 g × 1475 J × 108 °C = 9059391 gJ°C = 9059 g kJ °C

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Answer:

c

Explanation:

use %composition given to calculate emperical 4mular

The empirical formula of the compound having 57.5% Na, 40.0% O, and 2.5% H is NaOH (Option C)

Divide by their molar mass

Na = 57.5 / 23 = 2.5

O = 40 / 16 = 2.5

H = 2.5 / 1 = 2.6

Divide by the smallest

Na = 2.5 / 2.5 = 1

O = 2.5 / 2.5 = 1

H = 2.5 / 2.5 = 1

Thus, the empirical formula of the compound is NaOH

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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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b is your best bet hope this helps

Answer:

Proton

Explanation:

Answer:

the answer is your a awesome person

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:

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:

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:

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

Answer:

Muscular, and aerobic

Explanation:

the answer is bat and person

Answer:

Products

Explanation:

Answer:

because cycle is a prosess that goes through multiple stages

Explanation:

.

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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Results are neither precised nor accurate.

In the Given Actual density of silver  =10.5 g / cm^3

Measured values of silver  density = 14.2 g/cm^3

14.0g/cm^3

7.25g/cm^3

We have to  find whether the measurements given are accurate or precise.

so , Density can be defined as the ratio of mass to volume. The formula for calculation of density is shown below :

Density = Mass / Volume

The units of density is generally g / ml.

The results are said to be accurate if our measured value exactly matches with our true value.

In case of precision ,all the measured values should be near to each other or should differ only by 0.1 or 0.2.

So in this case the measured values are not precised nor accurate because it does not matches with true value also.

Hence , the results are neither precised nor accurate.

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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.

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

Answer:

True

True

Temperature

Explanation:

Answer:

Osmosis is a process which occurs when there is a difference in solute concentration between two solutions separated by a semipermeable membrane. A semipermeable membrane allows passage of water but not of solutes. The passage of water occurs because of a pressure difference of water between the two solutions

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:

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.