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blagie [28]
2 years ago
8

The successive ionization energies of a certain element are I1 = 589.5 kJ/mol, I2 =1145 kJ/mol, I3= 4900 kJ/mol, I4 = 6500 kJ/mo

l, and I5 = 8100 kJ/mol. This pattern of ionization energies suggests that the unknown element is:_________
a. K
b. Si
c. As
d. Ca
e. S
Chemistry
2 answers:
stepladder [879]2 years ago
8 0

Answer:

=D

Explanation:

Calcium has 2 Valence electrons which are easy to remove. From the ionization energy values, I1 = 589.5 kJ/mol, I2 =1145 kJ/mol, I3= 4900 kJ/mol, I4 = 6500 kJ/mol, and I5 = 8100 kJ/mol, the energy difference between the 2nd and 3rd electron is the highest because the energy required to remove the 3rd electron is geeatest which implies that the 3rd electron must be a completed octet-orbital electron which is more difficult to remove than other electrons

Gnom [1K]2 years ago
7 0

Answer:

As

Explanation:

For any element to exhibit the pattern of ionization energy shown in the question, it must possess five electrons in its outermost shell. These five electrons are not lost at once. They are lost progressively until the valence shell becomes empty. The ionization energy increases steadily as more electrons are lost from the valence shell.

The only pentavalent element among the options in arsenic, hence the answer.

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Carbon dating of small bits of charcoal used in cave paintings has determined that some of the paintings are from 10000 to 30000
Andru [333]

The age of painting was determined from the decay kinetics of the radioactive Carbon -14 present in the painting sample.

Given that the half life of Carbon-14 is 5730 years.

Radioactive decay reactions follow first order rate kinetics.

Calculating the decay constant from half life:

λ= \frac{0.693}{t_{1/2} }

        = \frac{0.693}{5730 yr} = 1.21*10^{-4}yr^{-1}

Setting up the radioactive rate equation:

ln\frac{A_{t} }{A_{0} } =-kt

Where A_{t} = Activity after time t = 0.80microCi

A_{t} = initial activity = 6.4microCi

k = decay constant = 1.21*10^{-4}yr^{-1}

ln\frac{0.80uCi}{6.4uCi} =-(1.21*10^{-4}yr^{-1})t

ln 0.125 = -(1.21*10^{-4}yr^{-1})t

-2.079=-(1.21*10^{-4}yr^{-1})t

t=\frac{2.07944}{1.21*10^{-4} } yr

 = 17185 years

t = 17185 years

Therefore age of the painting based in the radiocarbon -14 dating studies is 17185 years



6 0
2 years ago
How many moles of koh are contained in 750. ml of 5.00 m koh solution?
Marat540 [252]
Molarity is one of  the method of expressing concentration of solution. Mathematically it is expressed as,
 Molarity = \frac{\text{number of moles of solute}}{\text{volume of solution (l)}}

Given: Molarity of solution = 5.00 M
Volume of solution = 750 ml = 0.750 l

∴ 5 = \frac{\text{number of moles}}{.750}
∴ number of moles = 3.75

Answer: Number of moles of KOH present in solution is 3.75.
4 0
2 years ago
emelie is working on a science project. her task is to answer the question does rogooti a hair cream sold on tv affect the speed
joja [24]

Answer:

This question is incomplete and unclear; the complete question including the missing part is:

Emelie is working on a science project. Her task is to answer the question:

"Does Rogooti (a hair cream sold on TV) affect the speed of hair growth

(in length)". Her family is willing to volunteer for the experiment. Identify the control group (CG) and the independent and dependent variables.

ANSWER:

Independent variable: Rogooti hair cream

Dependent variable: Speed of hair growth/length

Control group: Family members that do not use the Rogooti hair cream

Explanation:

In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a measurable response. In this case, the ROGOOTI HAIR CREAM is the independent variable.

Dependent variable refers to the variable that is measured or the variable that responds to the change made to the independent variable. In this case, the dependent variable is SPEED AT WHICH HAIR GROWS (IN LENGTH).

Control group in an experiment is the group that does not receive the experimental treatment. In this case, the experimental treatment is the Rogooti hair cream, hence, the control group will be the VOLUNTEER FAMILY MEMBERS THAT DOES NOT RECEIVE THE ROGOOTI HAIR CREAM ON THEIR HAIR.

6 0
2 years ago
The piece of iron that miguel measured had a mass of 51.1 g and a volume of 6.63 cm 3 . what did miguel calculate to be the dens
likoan [24]
Given:
Mass, m = 51.1 g
Volume, V = 6.63 cm³

By definition, 
Density = Mass/Volume
              = (51.1 g)/(6.63 cm³)
              = 7.7074 g/cm³

In SI units,
Density = (7.7074 g/cm³)*(10⁻³ kg/g)*(10² cm/m)³
              = 7707.4 kg/m³

Answer: 7.707 g/cm³ or 7707.4 kg/m³

4 0
2 years ago
When exposed to very high temperatures, metals like iron can be turned into fluids that flow and can be poured into molds. What
oksano4ka [1.4K]

Answer: B) The energy of the solid increases, and the particles begin to slide past each other.

Explanation:

The energy of the solid matter is required to be increased so that molecules of the solid matter get separated from each other and an transition from solid matter to liquid matter occurs. The liquid components of the matter will slide past each other as they have obtain energy for fluidity. The liquid iron can be molded into any shape and the energy decreases considerably.

7 0
2 years ago
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