Converting carbon to nitrogen by increasing the number of protons from 6 to 7 and decreasing the number of neutrons from 8 to 7 is an example of what type of decay?

Answers

Answer 1

Answer:

Answer: The given decay process is beta decay.

Explanation:

Beta-decay is defined as the decay process in which a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units and has a mass of 0 units.

$_Z^A\textrm{X}\rightarrow _(Z+1)^A\textrm{Y}+_(-1)^0\beta$

The chemical reaction for converting carbon nucleus to nitrogen nucleus, the equation follows:

$_6^(14)\textrm{C}\rightarrow _7^(14)\textrm{N}+_(-1)^0\beta$

Thus, the given decay process is beta decay.

Answer 2

Answer:
this is beta decay as the mass number stays the same but proton number changes, this is specifically beta minus as a neuron changes into a proton

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how much potassium bromide, in grams, should be added to water to prepare 0.50 of solution with molarity of 0.125M?

Answers

Volume = 0.50 L

Molar mass KBr = 119.002 g/mol

Molarity = 0.125 M

Mass ( KBr) = ?

mass = molarity * molar mass * volume

mass = 0.125 * 119.002 * 0.50

mass = 7.437625 g of KBr

hope this helps!

Which statement best describes the light that will cause emission of electrons from a given metal through the photoelectric effect?light with any intensity below a certain frequency
light with any intensity above a certain frequency
light with any frequency below a certain intensity
light with any frequency above a certain intensity

Answers

The correct answer: (b) light with any intensity above a certain frequency

The explanation:

when Energy of a photon : E = hf

- The photoelectric effect works like this:

- If you shine light of high enough energy on to a metal, electrons will be emitted from the metal. Light below a certain threshold frequency, no matter how intense, will not cause any electrons to be emitted. Light above the threshold frequency, even if it's not very intense, will always cause electrons to be emitted.

Answer:

Explanation:

A scientist discovers a new substance. The molecules of the substance form hydrogen bonds with each other. When the molecules lose a lot of energy, the hydrogen bonds hold them relatively far apart. Based on this information, what can the scientist infer about the substance?

Answers

Answer is: It expands when it freezes.

When molecule frezes, it lose energy. When molecules are far apart, it means the volume is greater and it expands.

For example, ice expands when water is freezing.

Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.

The more the heat energy present in it the bond between the molecules gets weaker just like water

A sample of silver contains 5.71x10^22 atoms. how many moles of silver are present

Answers

According to the concept of Avogadro's number, there are 0.0948 moles of silver present in 5.71×10²² atoms of silver.

What is Avogadro's number?

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number

Therefore, number of moles=number of atoms/Avogadro's number

number of moles=5.71×10²²/6.023×10²³=0.0948

Thus, there are 0.0948 moles in 5.71×10²² atoms of silver.

Learn more about Avogadro's number,here:

brainly.com/question/11907018

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N=n×Nav

n=N / Nav

(5.71×10^22) / (6.02×10^23)

n=0.09mol

What is the percent by mass of magnesium sulfate in MgSO4 · 7H2O?

Answers

ANSWER - 48.83%

Mg - 24.31
S - 32.07
O - 16x4 - 64
ADD ALL TOGETHER = 120.38

H - 1.01x2 - 2.02
O - 16
TOTAL = 18.02x7 = 126.14

ADD 120.38 to 126.14 = 246.52
last part divide MgSO4 by total compound mass
120.38/246.52 then multiply by 100 = 48.831

Answer:

48.83

Explanation:

Edg

Butyric acid is responsible for the odor in rancid butter. A solution of 0.25 m butyric acid has a ph of 2.71. What is the ka for the acid?

Answers

Answer:

Ka = 1.5 -10^-5

Explanation:

Step 1: Data given

Molarity of the solution = 0.25 M

pH = 2.71

Step 2 The equation

C3H7COOH + NaOH ⇆ C3H7COONa + H2O

Step 3: Calculate pKa

pH = (pKa-log[acid])/2

2pH = pKa -log[acid]

pKa = 2pH +log[acid]

⇒with pH = 2.71

⇒with log[acid] = -0.60

pKa=2*2.71 -0.60

pKa = 5.42 - 0.60

pKa = 4.82

Step 4: Calculate Ka

pKa = -log(Ka)

Ka = 10^-4.82

Ka = 1.5 -10^-5

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