CHEMISTRY HIGH SCHOOL

What is the half-life of sodium-24? EXPLAIN how you determined your answer.

Answers

Answer 1

Answer:

The half life of sodium -24 is 15 hour.

What is half life?

The duration needed for an amount to decrease to half its original is known as the half-life.

What is sodium-24?

Sodium is a kind of element which has atomic number 11. It has three isotopes.

The radioactive isotope sodium-24, which is employed in blood tests in medicine, degrades through beta decay as well as seems to have an of 15.0 hours.

Therefore, the half life of sodium -24 is 15 hour.

To know more about half life.

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Answer 2

Answer: half-life is basically how long it takes for a radioactive molecule to get to 1/2 of its original mass.

so if sodium 24 mass was 5g and it's half life was 24years then:

after every 24years 1/2 of 5g would have decayed. so in 48years there will only be 2.5g left.

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Planck's constant relates the Joules of energy absorbed/released by matter to the:A. atomic number of the element

B. observed wavelength of light

C. speed of light

D. mass of the particulate matter

Answers

Answer: B. observed wavelength of light

Explanation: The relation of Planck's constant relating the Joules of energy absorbed/released by matter is usually used to determine the energy of the photon. The mathematical expression is -

E= h c / $\lambda$

Thus as we can observe that the energy is directly proportional to the speed of light and inversely proportional to the wavelength of the light.

Thus , we can say that Planck's constant relates the Joules of energy absorbed/released by matter to the observed wavelength of light.

The right answer for the question that is being asked and shown above is that: "B. observed wavelength of light" Planck's constant relates the Joules of energy absorbed/released by matter to the B. observed wavelength of light

An unstable nucleus loses the most mass if the nucleus emits(1) an alpha particle (3) a positron
(2) a beta particle (4) a gamma ray

Answers

The correct answer is option 1. An unstable nucleus loses the most mass if the nucleus emits an alpha particle. This type of electromagnetic radiation has the largest mass among the radioactive particles. When this particle is emitted from a nucleus, it loses two protons and two neutrons therefore large amount of mass is lost.

For an ideal gas, classify the following pairs of properties as directly or inversely proportional.P and T
V and n
T and V
P and V
P and n

Answers

For an ideal gas, the ideal gas equation can be used to relate the changes in the conditions of the system. The equation is expressed as:

PV = nRT

Therefore, the following are classified as:
P and T = directly proportional
V and n = directly proportional
T and V = directly proportional
P and V = inversely proportional
P and n = directly proportional

The following pairs of properties as

directly proportional :

P and T

V and n

T and V

P and n

inversely proportional :

P and V

Further explanation

Some of the laws regarding gas, can apply to ideal gas (volume expansion does not occur when the gas is heated), among others

Boyle's law at constant T, P = 1 / V
Charles's law, at constant P, V = T
Avogadro's law, at constant P and T, V = n

So that the three laws can be combined into a single gas equation, the ideal gas equation

In general, the gas equation can be written

$\large{\boxed{\bold{PV=nRT}}}$

where

P = pressure, atm

V = volume, liter

n = number of moles

R = gas constant = 0.082 l.atm / mol K

T = temperature, Kelvin

Proportional Comparisons / Directly proportional are comparisons of two or more numbers where one number increases, the other numbers also increase at the same rate

Can be formulated

$\displaystyle \frac {x1} {y1} = \frac {x2} {y2}$

Inversely proportional is the comparison of two or more numbers where one number increases, the other number decreases in value

Can be formulated

$\displaystyle \frac {x1} {y2} = \frac {x2} {y1}$

The following pairs of properties as directly or inversely proportional.(from ideal gas equation)

P and T : directly proportional

PV=nRT

V and n : directly proportional

PV=nRT

T and V : directly proportional

PV=nRT

P and V : inversely proportional

$\displaystyle \bold{P}=\frac{nRT}{\bold{V}}$

P and n : directly proportional

PV=nRT

Learn more

Which equation agrees with the ideal gas law

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Which law relates to the ideal gas law

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Keywords : ideal gas law, directly proportional, inversely proportional.

Explain why the elements of groups 1 and 7 are mostly used in
the form of compound

Answers

Group 1 and group 7 of element group consists of alkali metal, which are generally combined with other elements in nature, so they have properties of compound

How does assigning oxidation states in compounds help you balance redox reactions?a. The oxidation state tells you how the bonding electrons are arrayed in an atom or molecule. b. The oxidation state tells you about an atom or molecule’s potential to accept or donate electrons. c.The oxidation state tells you the exact charge in each atom. d. The oxidation state is the equivalent of the formal charge. I'm a little stuck on chemistry homework.

Answers

The best answer is B.....
In my words though, the oxidation state helps with you knowing how many electrons are lost or gain by the reactant to produce its product and by knowing this you can then balance the electron transfer and ultimately the equations.

Which statement is true regarding the formation of ionic bonds?(a). Anions and cations share electrons.
(b). Atoms transfer electronsto form cations and anions.
(c). Ions transfer electrons to form cations and anions.
(d). Anions and cations donate electrons.

Answers

Answer: (b). Atoms transfer electrons to form cations and anions.

Explanation:

Covalent compounds are formed by sharing of electrons takes place between non metals.Ionic compounds are formed by transfer of electrons between metals and non metals.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Sodium atom has oxidation number of +1.

Electronic configuration of sodium:

$[Na]=1s^22s^22p^63s^1$

Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.

$[Na^+]=1s^22s^22p^63s^0$

Chlorine atom has oxidation number of -1.

Electronic configuration of chlorine:

$[Cl]=1s^22s^22p^63s^23p^5$

Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.

$[Cl^-]=1s^22s^22p^63s^23p^6$

In sodium chloride the one electron from sodium metal gets transferred to chlorine atom and thus form an ionic bond.

Answer:

Atoms transfer electrons to form cations and anions.

Explanation:

Covalent compounds are formed by sharing of electrons takes place between non metals.Ionic compounds are formed by transfer of electrons between metals and non metals.

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