Bombarding sodium-23 with a
proton produces nuclide X and a neutron. What is nuclide X?

Answers:

magnesium-24

magnesium-23

neon-23

s
odium-24

none of the above

The isotope P
has a half-life of 14.3 days. If a sample originally contained 1.00 g of P,
how much was left after 43 days?

Answers:

0.250 g

0.125 g

0.750 g

0.500 g

Identify X in the reaction
below.
U
+ C
→ Cf
+ X

Answers:

1
alpha particle

3
protons

6
neutrons

6
electrons

A .20 gram sample of C-14 was allowed to decay for 3 half-lives. What mass
of the sample will remain? Carbon-14 has a half life of 5730
years.

Answers:

0.025

0.05

0.1

0
.01

0.05

The isotope Cu
has a half-life of 30 s. If a sample originally contained 48 mg of Cu,
how much time passed before the amount fell to 3 mg?

Answers:

120 s

240s

30 s

60 s(when I did my calculation for the question above, I got 60 seconds)

What radionuclide decays to Fe-56
by beta emission?

Answers:

Fe

Co

Mn

Co

MnHow do I know wat it becomes. I put 57 Co 27 and it's wrong.

The Cf
to Cf
conversion is accompanied by __________.

Answers:

an alpha
emission

a
neutron capture

an electron
capture

an electron releaseI would greatly appreciate your help...ASAP. Thank you.

Answers

Answer 1

Answer: Bombarding sodium-23 with a proton produces nuclide X and a neutron. What is nuclide X?

$^(23)_(11)Na--^(\beta^+)--> ^(23)_(10)Ne + e^(+)$

answer: neon
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The isotope P has a half-life of 14.3 days. If a sample originally contained 1.00 g of P,
how much was left after 43 days?

0 days >>> 1.00g
14,3 days >>> 1.00g :2 = 0,5g
(14.3+14.3) days >>> 0.5g : 2 = 0.25g
(14.3+14.3+14.3) days >>> 0.25g : 2 = 0.125g

answer: 0.125g
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Identify X in the reaction
below.
U + C → Cf + X

$^(238)_(92)U ---> ^(251)_(98)Cf+6e^-$

answer: 6 electrons (so it's beta⁻)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A .20 gram sample of C-14 was allowed to decay for 3 half-lives. What mass
of the sample will remain? Carbon-14 has a half life of 5730
years.

at the beginning >>> 0.20g
1 half-live >>> 0.20g : 2 = 0.10g
2 half-live >>> 0.10g : 2 = 0.05g
3 half-live >>> 0.05g : 2 = 0.025g

answer: 0.025g
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The isotope Cu has a half-life of 30 s. If a sample originally contained 48 mg of Cu,
how much time passed before the amount fell to 3 mg?

0 s (at the beginning) >>> 48mg
30s >>>>>>>>>>>>>>> 48mg : 2 = 24mg
(30+30)s >>>>>>>>>>> 24mg : 2 = 12mg
(30+30+30)s >>>>>>>> 12mg : 2 = 6mg
(30+30+30+30)s >>>>> 6mg : 2 = 3mg

answer: 30+30+30+30 = 120s
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
What radionuclide decays to Fe-56 by beta emission?

$^(56)_(26)Fe--^(\beta^-)-->^(56)_(27)Co + e^-$

answer: ⁵⁶₂₇Co
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The Cf to Cf conversion is accompanied by __________.

Cf to Cf ???? maybe...mistake?

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Paintball is a popular recreational activity that uses a metal tank of compressed carbon dioxide or nitrogen to launch small capsules of paint. A typical tank has a volume of 508 cubic centimeters. A 340. gram sample of carbon dioxide is added to the tank before it is used for paintball. At 20.oC, this tank contains both CO2(g) and CO2(l). After a paintball game, the tank contains only CO2(g).Determine the total number of moles of CO2 added to the tank before it is used for paintball.

Answers

The total number of moles of CO₂ added to the tank before it is used for paintball is 7.73 moles.

What is a mole ?

A mole of a substance is that containing 6.022 * 10^23 molecules of that substance

A 340 gm sample of carbon dioxide

Molecular weight = 44

Moles added to the tank = mass/ molecular meight

Moles added to the tank = 340 /44

= 7.73 moles

The total number of moles of CO₂ added to the tank before it is used for paintball is 7.73 moles.

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We know,
1000 cm³ = 1 L
1 cm³ = 1 / 1000 L
508 cm³ = (1 / 1000) * 508 L = 0.5080 L

So, 508 cm³ = 0.5080 L

Now,
We know,
22.4 L = 1 mole
1 L = 1 / 22.4 mole
0.5080 L = (1 / 22.4) * 0.5080L = 0.0227 moles

So, 0.0277 moles moles of $CO_2$ are added to the tank before it is used for paintball.

What is the result of adding KF to an equilibrium mixture of the weak acid HF?HF(aq)⇔H+(aq)+F-(aq).

a. F- concentration decreases
b.the dissociation constant, K, increases
c. HF concentration decreases
d. H+ concentration decreases

Answers

When gaseous hydrogen chloride is passed through a sodium chloride solution, precipitation of the sodium chloride occurs as a result of an excess of chloride ions in the solution (caused by the dissociation of HCl). Here the concentration of H⁺ decreases. The correct option is D.

What is common-ion effect?

When another electrolyte (which includes an ion that is also present in the first electrolyte, i.e., a common ion) is added, the common ion effect suppresses the ionisation of the first electrolyte. It is thought to be a result of Le Chatlier's principle, often known as the equilibrium law.

An increase in the concentration of one of the ions dissociated in the solution by the addition of another species containing the same ion will result in an increase in the degree of association of ions in a solution where there are several species associating with each other via a chemical equilibrium process.

Here the common ion 'F' in KF supresses the dissociation of HF.

Thus the correct option is D.

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Answer D. Follow Le Chatelier's principle.

How many moles are in 11.82 grams of gold?

Answers

11.82 x 1 mole / (molar mass)
The molar mass = 197 g/mol

11.82 / 197 = .06

Name this compound: Spelling counts! PCI5

Answers

P is a element called Phosphorus.
Cl is chlorine. Since their is 5 of chlorine, we call it pentachloride. Penta means 5, as in the shape PENTAgon.

Compound Name: Phosphorus pentachloride

We can see here that the compound with the formula, $PCI_(5)$ is called phosphorus pentachloride.

What is a compound?

A compound is a substance that consists of two or more different elements chemically bonded together in fixed proportions. In a compound, the constituent elements lose their individual properties and form new chemical properties unique to the compound.

The study of compounds is central to chemistry, as it involves understanding the structure, composition, and reactivity of substances. Compound analysis and synthesis play vital roles in various scientific fields, such as materials science, pharmaceuticals, and environmental science.

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What is the measurement from the line of origin to the crest? A. Trough
B. Amplitude
C. Crest
D. Wavelength

Answers

Im 90% sure its B amplitude

If the plum pudding model was correct, what would the result of rutherfords expirement be

Answers

Most of the positively charged particles should bounce back at a range of angles as they collide with the atoms in the foil; only a few should pass straight through the foil.

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