Alpha effect on atomic mass and effect on atomic number

Answers

Answer 1

Answer:

Question: alpha effect on atomic mass and effect on atomic number

Answer: the atomic mass number decreases by four and the atomic number decreases by two

Explanation: When an alpha particle is emitted from the nucleus, the nucleus loses two protons and two neutrons and creates a new element

question answered by

(jacemorris04)

Answer 2

Answer: By usuning usfal numbers

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Which statement best explains the symbol [NaCl]? moles of water per liter of NaCl moles of water per liter of solution moles of NaCl per liter of solution moles of NaCl per liter of water

Answers

Answer:

moles of NaCl per liter of solution.

Explanation:

[NaCl] is an expression of the concentration of NaCl.

If the concentration is the molarity;

Molarity can be defined as the no. of moles of solute dissolved per a 1.0 L of the solution.

For [NaCl] is a symbol for: moles of NaCl per liter of solution.

Answer: moles of $NaCl$ per liter of solution

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

$Molarity=(n)/(V_s)$

where,

n= moles of solute

$V_s$ = volume of solution in L

Square brackets represents the concentration of a substance i.e. amount of solute dissolved per liter of the solution.

Thus $NaCl$ represents moles of $NaCl$ per liter of solution.

A mixture of He, Ne, and N2 gases are a pressure of 1.348. If the pressures of He and Ne are 0.124 atm, what is the partial pressure of N2 in the mixture ?

Answers

Answer : The partial pressure of $N_2$ in the mixture is, 1.224 atm

Solution :

According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.

$P_T=p_(He)+p_(Ne)+p_(N_2)$

where,

$P_T$ = total partial pressure of $He,Ne\text{ and }N_2$ = 1.348 atm

$P_(He)$ = partial pressure of helium

$P_(Ne)$ = partial pressure of neon

$P_(N_2)$ = partial pressure of nitrogen

As we are given that,

$P_(He)+P_(Ne)=0.124atm$

Now put all the given values in above expression, we get the partial pressure of the nitrogen gas in the mixture.

$1.348atm=0.124atm+p_(N_2)$

$p_(N_2)=1.224atm$

Therefore, the partial pressure of $N_2$ in the mixture is, 66 Kpa

The Best Answer: 1 - (.47+.23) = 0.30

If Ne has a mole fraction of 0.47 (or 47/100) and Ar is 0.23, then H2(or He) has a mole fraction of 0.30

This means the gas mixture is 30/100 H2(or He).

7.85 x 0.30 = 2.355 atm

Name two parts of the water cycle in which contaminants can be introduced.

Answers

To solve this we must be knowing each and every concept related to water cycle. Therefore, ground water and rain water are the two parts of the water cycle in which contaminants can be introduced.

What is water cycle?

The water cycle is also known as the hydrologic cycle. Water flows continuously through this cycle inside the Earth-atmosphere system. The five main stages of the water cycle—evaporation, transpiration, precipitation, condensation, and runoff—are the most important.

Evaporation is among the most important phases of the water cycle since it involves the transition of water from either the Earth's surface into the atmosphere. Ground water and rain water are the two parts of the water cycle in which contaminants can be introduced.

Therefore, ground water and rain water are the two parts of the water cycle in which contaminants can be introduced.

To know more about water cycle, here:

brainly.com/question/9243222

#SPJ2

Ground water and rain water I belive

Fernando places 50 mL of HCl in a 100 mL beaker and 50 mL of NaOH in a 100 mL beaker. he places them on a scale together and measures a combined mass of 15.00 grams. he then mixes the liquids together and waits five minutes while they react. to make the HCl used in the experiment, Fernando mixed 10 mL of HCl with 40 mL of water. what are the properties of this mixture? select all that apply.

A. The H2O is the solute.
B. The HCl is the solute.
C. TheHCL is the solvent.
D. The H2O is the solvent.
E. This mixture conducts electricity.
F. This mixture does not conduct electricity.

help!

Answers

Answer:

The correct options are:

B. The HCl is the solute.

D. The H₂O is the solvent.

E. This mixture conducts electricity.

Explanation:

For the preparation of the HCl solution, 10 mL of HCl and 40 mL of water were mixed.

The compound that is present in the solution in a smaller ratio is the solute and the other compount -present in higher ratio- is the solvent.

So, the solute is HCl and the solvent is water (H₂O). Furthermore, water is considered as an universal solvent (for most of the polar and ionic compounds). According to this, the following options are correct:

B. The HCl is the solute.

D. The H₂O is the solvent.

Then, a condition for a solution that is able to conduct electricity is the presence of ions in the solution. When HCl is dissolved in water, it dissociates in ions according to the following equilibrium:

HCl ⇔ H⁺ + Cl⁻

The ions H⁺ and Cl⁻ are electrically charged so the solution can conduct electricity. According to this, the following option is also correct:

E. This mixture conducts electricity.

Which process transfers heat when particles collide in a solid

Answers

The correct answer is conduction. Radiation involves heat moving through space (I think as light but I could be wrong) and convection involves heat transferring through the movement of a fluid such as gas or liquid.

I hope his helps. Let me know in the comments if anything is unclear.

What method would you use to obtain pure water from a mixture of water and ink

Answers

Answer: Distillation

Explanation:

Distillation is the process of purifying a liquid by successive evaporation and condensation. Water vaporises at a lower temperature compared to the ink pigment, therefore, the mixture is heated to boiling so that the water evaporates leaving the ink pigments in the flask. The evaporated water can the be passed into a condenser which converts the water vapour into liquid.

Answer: Distillation

Explanation: Separate ink from water using a process called distillation. This is a process of separating two substances mixed together. Water vaporizes at a lower temperature than the ink pigment so if you heat them, the water evaporates, leaving the ink pigment in the flask.

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