CHEMISTRY HIGH SCHOOL

What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?

Answers

Answer 1

Answer:

the theoretical yield of hydrogen gas is 10 g

calculation

Step 1: write the equation for reaction

Zn + 2 HCl → zncl₂ + H₂

Step 2: use the mole ratio to find the moles of H₂

from equation above Zn : H₂ is 1: 1 therefore the moles of H₂ = 5.00 moles

Step 3: find the theoretical yield(mass) for H₂

mass = moles × molar mass

from periodic table the molar mass of H₂= 1×2 = 2 g/mol

mass = 5 moles × 2 g/mol = 10 grams

Answer 2

Answer:

Answer:

B. 10.1 g

Explanation:

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26. All atoms area. positively charged, with the number of protons exceeding the number of electronsb, negatively charged, with the number of electrons exceeding the number of protonswith the number of protons equaling the number of electronsd. neutral, with the number of protons equaling the number of electrons. which is equal to thenumber of neutrons27. The particles that are found in the nucleus of an atom arec. protons and neutronsa, neutrons and electronsd. protons and electronsb. electrons only28. As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to betrue?a. Protons. electrons, and neutrons are evenly distributed throughout the volume of the atom.b. The nucleus is made of protons, electrons, and neutrons.c. Electrons are distributed around the nucleus and occupy almost all the volume of the atom.d. The nucleus is made of electrons and protons.29. The nucleus of an atom isa. the central core and is composed of protons and neutronsb. positively charged and has more protons than neutronsc. negatively charged and has a high densityd. negatively charged and has a low density

Answers

(26) All atoms area...with the number of protons equaling the number of electrons

(27) The particles that are found in the nucleus of an atom are... protons and neutrons.

(28) As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true?...Protons. electrons, and neutrons are evenly distributed throughout the volume of the atom.

(29) The nucleus of an atom is...the central core and is composed of protons and neutrons.

Which general trend in period 2 on the Periodic table as the elements are considered in order of increasing atomic number? 1)increasing atomic radius
2.) decreasing electronegativity
3.) increasing 1st ionization energy
4.) decreasing atomic mass

Answers

As the atomic number increase in the 2nd period, the first ionization energy also increases. Therefore, option (3) is correct.

What is the ionization energy?

The ionization energy can be described as the minimum amount of energy that is absorbed by an electron to come out of the influence of the nucleus of a gaseousatom.

In general, the atomic number of an atom increases as we move from left to right in a period on the modern periodic table. While moving from left to right, there is an increase in the effective nuclear charge while the electron enters the same electron shell.

The atomic radius of an atom in the period decreases in the order of increasing atomic number. As the effective nuclear charge is increasing large amount of energy is required to knock out the electron from an atom. Therefore, the first ionization energy also increases as the atomicnumber increase in the 2nd period.

Learn more about ionization energy, here:

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3.) Increasing 1st ionization energy.

What is a common ancestor?

Answers

In evolutionary biology, a common ancestor is allegedly a link between two varying branches or types of creatures. (Another word for these is 'missing links', since up to this point, not a single one of these common ancestors has been found in the fossil record)
Hope that helped =)

A Common ancestor is a organism that has shared predecessor of more then one different scion of a group of organisms.

A sample of gas at 300 K has a volume of 2.0 liters. At what temperature will the volume decrease to 1.0 liter if the pressure is kept constant?

Answers

Answer : The temperature will be, 150 K

Explanation :

Charles' Law : This law states that volume of gas is directly proportional to the temperature of the gas at constant pressure and number of moles.

$V\propto T$ (At constant pressure and number of moles)

or,

$(V_1)/(T_1)=(V_2)/(T_2)$

where,

$V_1$ = initial volume of gas = 2.0 L

$V_2$ = final volume of gas = 1.0 L

$T_1$ = initial temperature of gas = 300 K

$T_2$ = final temperature of gas = ?

Now put all the given values in the above formula, we get the final temperature of gas.

$(2.0L)/(300K)=(1.0L)/(T_2)$

$T_2=150K$

Therefore, the temperature will be, 150 K

pv/t=c
Therefore

v/t=c
2/300=1/t2
t2=150K

A 12 kg object experiences a net force of 120 N. What acceleration will this object experience?

Answers

Answer:

10 m/s²

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

$a = (f)/(m) \n$

f is the force

m is the mass

From the question we have

$a = (120)/(12) \n$

We have the final answer as

10 m/s²

Hope this helps you

Given that there are 1000mL in 1L how many liters are there in 0.0200mL

Answers

Answer:

2×10^-5L

Explanation:

Since there are

1000mL in 1L

0.0200mL will give us

0.0200/1000

= 2×10^-5L

Final answer:

To convert 0.0200mL to liters, we use the conversion factor 1L = 1000mL. The calculation becomes 0.0200mL divided by 1000, which equals to 0.00002L.

Explanation:

The given question asks, how many liters are there in 0.0200mL given the conversion factor that there are 1000mL in 1L. To calculate this, we will use the known conversion factor and divide 0.0200mL by 1000. Here are the steps:

Identify the conversion factor. We know that 1L = 1000mL.
Set up the calculation to convert mL to L. This will be: mL/1000 = L.
Substitute 0.0200mL into the equation: 0.0200mL/1000 = 0.00002L.

So there are 0.00002 liters in 0.0200mL.

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