What mass of gold (Au) contains the same number of atoms as 2.61 g of aluminum (Al)?

Answer:

16 neutrons.

Explanation:

From the question given above, the following data were obtained:

Mass number = 30

Atomic number = 14

Neutron number =?

Next, we shall determine the number of protons present in the isotope. This can be obtained as follow:

The atomic number of an element is simply defined as the number of protons present in the atom of the element. Thus,

Atomic number = Proton number

Atomic number = 14

Therefore,

Proton number = 14

Finally, we shall determine the number of neutons present in the isotope as follow:

Mass number = 30

Proton number = 14

Neutron number =?

Mass number = Proton + Neutron

30 = 14 + Neutron

Collect like terms

Neutron = 30 – 14

Neutron = 16

Therefore, the isotope contains 16 neutrons.

Answer:

4.5 moles of lithium sulfate are produced.

Explanation:

Given data:

Number of moles of lead sulfate = 2.25 mol

Number of moles of lithium nitrate = 9.62 mol

Number of moles of lithium sulfate = ?

Solution:

Chemical equation:

Pb(SO₄)₂ + 4LiNO₃      →     Pb(NO₃)₄ + 2Li₂SO₄

Now we will compare the moles of lithium sulfate with lead sulfate and lithium nitrate.

                       Pb(SO₄)₂        :         Li₂SO₄

                            1                :             2

                          2.25           :          2/1×2.25 = 4.5 mol

                       LiNO₃            :             Li₂SO₄

                           4                :                2

                           9.62           :             2/4×9.62 = 4.81 mol

Pb(SO₄)₂  produces less number of moles of Li₂SO₄ thus it will act as limiting reactant and limit the yield of  Li₂SO₄.      

Answer:

The empirical formula is PbC₈H₂₀

Explanation:

To determine the empyrical formula, we need to determine the % of each element:

(38.43g  / 60 g ). 100 = 64.05 % of Lead

(17.83 g / 60 g) . 100 = 29.72 % of Carbon

(3.74 g / 60 g) . 100 = 6.23 % of H

Now we divide by the atomic mass:

64.05 / 207.2 = 0.309

29.72 / 12 = 2.48

6.23 / 1 = 6.23

We pick the lowest value and we divide again, with this number

0.309 / 0.309 = 1 Pb

2.48 / 0.309 = 8 C

6.23 / 0.309 = 20 H

PbC₈H₂₀

Answer:

2060.775 J

Explanation:

From the question given above, we obtained the following data:

Specific heat capacity (C) = 0.129 J/g°C

Mass (m) = 355 g

Initial temperature (Tᵢ) = 95 °C

Final temperature (Tբ) = 140 °C

Heat (Q) tranfered =?

We can calculate the amount of heat transferred by using the following formula:

Q = mC(Tբ – Tᵢ)

Q = 355 × 0.129 (140 – 95)

Q = 45.795 × 45

Q = 2060.775 J

Thus, 2060.775 J of energy was transferred.

Answer:

2060.775 Joules

Explanation:

Answer:

B. hydrogen only.

Explanation:

The element hydrogen is a made up of only hydrogen atoms which are the particles in the element.

Hydrogen is an element. It has distinct hydrogen atoms that typifies it.

An element is a distinct substance that is made up of one kind of atom. The only kind of atom in element hydrogen is those hydrogen itself.

Try tissue

Explanation:

Answer:

See explanation

Explanation:

The equation of the reaction is;

CH3COOCH3 + H2O -------> CH3COOH + CH3OH

Now recall that the rate of reaction refers to the rate of disappearance of reactants or the rate of appearance of products. We indicate that reactants disappear by a negative sign placed in front of the concentration term of reactants.

Rate = k -d[CH3COOCH3]/dt

Rate = k d[CH3COOH]/dt

Rate = k d[CH3OH]/dt

Note; i did not write the rate in terms of water because it is a solvent that is present in large excess. Its concentration does not change with time.

Answer:

Passive transport, and Active transport

Explanation:

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Answer: The heat required to melt 25.0 g of ice at [tex]0^0C[/tex] is 8350 Joules

Explanation:

Heat of Fusion tells us how much energy is needed to convert 1g of a solid to a liquid at the same temperature.

[tex]Q=m\times L[/tex]

Q = Heat absorbed = ?  

m = mass of ice = 25.0 g

L = Latent heat of fusion of ice = 334 J/g

Putting in the values, we get:

[tex]Q=25.0g\times 334J/g=8350J[/tex]

Thus heat required to melt 25.0 g of ice at [tex]0^0C[/tex] is 8350 Joules

NaH is an ionic compound as shown below, and is made of sodium cations (Na+) and hydride anions (H-). It has the same octahedral crystal structure as NaCl, with each sodium ion surrounded by six hydride ions. The free hydride ions give this molecule its strong basic character. hope this helps

Answer:

a) p waves travel slower then 5 waves

Answer:

sun

Explanation:

because all plants use energy from the sun to make food and grow

Answer:

Explanation:

Mole ratios are used as conversion factors between products and reactants in stoichiometry calculations.. For example, in the reaction . 2H₂(g) + O₂(g) → 2H₂O(g) The mole ratio between O₂ and H₂O is #(1 mol O₂)/(2 mol H₂O)#.

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The mole ratio between HCl and H20 is 1:1.

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

Physical state should be written in brackets. s means solid, l means liquid, g means gas. Mole ratios are used as conversion factors between products and reactants in stoichiometry calculations. The mole ratio between HCl and H20 is 1:1.

Therefore, the correct option is option A.

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Answer:

A. Antoine-Laurent Lavoisier

Explanation:

Hope this helped!

Answer:

When looking at the radiation emitted by distant stars or galaxies, scientists see emission spectra 'shifted' towards the red end of the electromagnetic spectrum—the observed wavelengths are longer than expected. ... Something causes the wavelength of the radiation (emitted by faraway stars and galaxies)

Answer:

C

Explanation:

a hypothesis always comes first

Answer:

C

Explanation:

They form hypothesis first, then perform the experiment to test the hypothesis. After multiple experiments, they form a theory.

Thus C is correct

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Answer:

The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance.

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Answer:

C.

Explanation:

Transition elements  like,  for example,  iron:

Fe2+  green colored in solution.

Fe3+  brown colored in solution.

The percent  by volume of a solution : 19.23%

Given

50 ml of ethanol

210  ml of water

Required

The percent  by volume of a solution

Solution

Percent Volume (% v/v) : volume (ml) of solute/100 ml of solution ⇒ ratio of the volume of the solute to total volume of the solution

[tex]\tt \%solute(v/v)=\dfrac{solute~volume}{solution~volume}\times 100\%[/tex]

solute= Ethanol

solvent=water

Solution = solute+solvent

Total volume of the solution :

[tex]\tt =volume~of~Ethanol+solume~of~water\\\\=50~ml+210~ml\\\\=260~ml[/tex]

Percent by volume :

[tex]\tt \%volume=\dfrac{50}{260}\times 100\%\\\\\%volume=19.23\%[/tex]

Answer:

d. naoh

Explanation:

Answer:

Two plates pull towards each other

Explanation:

Along a convergent plate boundary, two plates moves towards each other as the move in the same direction.

This results in different forms of plate interactions depending on the plate types.

Answer:

What happens along a convergent plate boundary?

If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction. ... The new magma (molten rock) rises and may erupt violently to form volcanoes, often building arcs of islands along the convergent boundary

Explanation:

Answer:

O3

Explanation:

According to the equation for the kinetic energy of a moving object, O3    (OZONE) gas would have the lowest average velocity, assuming all gases are at the same temperature.

A temperature is a unit used to represent hotness or coolness on any of a number of scales, including Fahrenheit and Celsius. According to temperature, heat energy will naturally move from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature)

Although these descriptive words are well-known and suitable to describe this landscape, they do not accurately convey temperature. By definition, the temperature is a technique to express warmth and coldness through numerical descriptors. To put it another way, it can provide a subjective description of a comparable, numerical value.

A thermometer is frequently used to measure temperature. The idea of thermal equilibrium must be understood in order to comprehend how thermometers function. Thermal equilibrium occurs when two materials that are in contact are both at the same temperature.

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Answer:

helium

Explanation:

By losing an electron, they look like the noble gas that immediately precedes them on the periodic table.

Answer:

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Explanation: