What is the mass of an atom that has 2 protons, 3 neutrons, and 2 electrons? 2 3 5 7

Answers

Answer 1

Answer: Mass Number = Proton + Neutron = 2 + 3 = 5

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ammonia gas is used as refrigerant 0.474 atm. Pressure is required to change 2000 cm3 sample of ammonia initially at 1.0 atm to 4.22 dm3 at constant temperature. Show this data in boyles law

Answers

Answer: The pressure required is 0.474 atm

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto \frac{1}V}$ (At constant temperature and number of moles)

The equation is,

${P_1V_1}={P_2V_2}$

where,

$P_1$ = initial pressure of gas = 1.0 atm

$P_2$ = final pressure of gas = ?

$V_1$ = initial volume of gas = $2000cm^3$

$V_2$ = final volume of gas = $4.22dm^3=4220cm^3$ ( $1dm^3=1000cm^3)$

Now put all the given values in the above equation, we get:

${1.0* 2000}={P_2* 4200}$

$P_2=0.474atm$

The pressure required is 0.474 atm

Give two reasons why a gold ring is not made of 100% gold.

Answers

Gold is extremely malleable in its purest form, so a 24-carat (pure) gold ring would be very easy to get dented and squashed during the time that it is being worn.
It is also extremely expensive to process gold to its purest form, so pure gold jewelry would be ridiculously expensive, to the point of no demand.
Hope that helped =)

1. Gold is soft like lead.

2. Pure gold isn't durable, and wouldn't last, nor would you be able to keep it on your finger since it's so soft. If you're gonna wear a ring for a life-time, it has to have durability.

calculate the mass required to prepare 2.5 L of 1.0 M NaOH solution. Given that the molar mass for NaOH is 40 g/mol.

Answers

Answer:

$100\; \rm g$ of ${\rm NaOH}\; (s)$ would be required.

Explanation:

The quantity of solute in a solution of concentration $c$ and volume $V$ would be $n = c \cdot V$ .

It is given that volume $V = 2.5\; \rm L$ for the solution in this question. It is also given that the concentration of the $\rm NaOH$ solute in this solution is $c = 1.0\; \rm M$ , which is the equivalent to $c = 1.0\; \rm mol \cdot L^(-1)$ .

Apply the equation $n = c \cdot V$ to find the quantity of $\rm NaOH$ in this solution:

$\begin{aligned}n &= c \cdot V \n &= 1.0\; \rm mol \cdot L^(-1) * 2.5\; \rm L \n &= 2.5\; \rm mol\end{aligned}$ .

Multiply the quantity $n$ of $\rm NaOH$ in this solution with the formula mass $M$ of ${\rm NaOH}\!$ to find the corresponding mass:

$\begin{aligned}m &= n \cdot M \n &= 2.5\; \rm mol * 40\; \rm g \cdot mol^(-1) \n &= 100\; \rm g\end{aligned}$ .

Thus, this solution would contain $100\; \rm g$ of ${\rm NaOH}$ .

It would thus take $100\; \rm g$ of ${\rm NaOH}$ to prepare this solution.

Answer:

The required mass to prepare 2.5 L of 1.0 M NaOH solution is 100 g

Explanation:

We do this by preparing the equation:

Mass = concentration (mol/L) x volume (L) x Molar mass

Mass = 1.0 M x 2.5 L x 40 g/mol

Mass = 100 g

Which must be a mixture of substances?
1. solid
2. liquid
3. gas
4. solution

Answers

the one that must be a mixture of substance is : 4. Solutionhere are some examples that proof option 1 - 3 could consist only with a single substance :Solid = Fe ( most commonly known as iron)Gas = He ( Most commonly known as helium)Liquid = Hg (most commonly known as mercury)

4.Solution

Further explanation

Mixtures are materials composed of two or more kinds of substances that still possess their original properties. Mixtures can also be said to represent a combination of several substances, elements or compounds

There are two types of mixtures, i.e., homogeneous mixture (or solution) and heterogeneous mixture.

Homogeneous mixture: mixture which each part contains a similar amount of solute, for example, vinegar acid solution, sugar solution, and salt solution.
Heterogeneous mixes: mixtures of which each part contains an unequal amount of solute, for example, river water, sewage water, and coffee drinks.

The solution is a homogeneous mixture of two or more substances that dissolve one another and each of the constituent substances cannot be distinguished physically anymore.

The solution consists of two components, i.e., solute and solvent.
For example, a salt solution consists of salt as a solute and water as a solvent.

In chemistry, we already know the phase of matter or state of matter, i.e., solid (s), liquid (l), gas (g), and aqueous (aq). Every chemical solution in a reaction is labeled as an aqueous phase, e.g, $\boxed{ \ NaCl_((aq)) \ }$ as a salt solution.

Consider the following examples:

$\boxed{ \ Fe_((s)) \ }$ as a solid metal iron, an element.
$\boxed{ \ H_2O_((l)) \ }$ as liquid water.
$\boxed{ \ H_2O_((s)) \ }$ as ice solids.
$\boxed{ \ H_2O_((g)) \ }$ as water vapor with a gaseous phase.
$\boxed{ \ H_2O_((l)), H_2O_((s)), H_2O_((g)) \ }$ are compounds of the same chemical formula but different phases.

Learn more

About the mass and density of substances brainly.com/question/4053884
Calculating the pH value of weak base brainly.com/question/9040743
How was the water filtered to remove debris and living organisms? brainly.com/question/5646770

Keywords: which must be, a mixture of substances, solid, liquid, gas, solution, homogeneous, heterogeneous, phase of matter, state, aqueous, salt, water

[17]. Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. If a tank of Trinix 10/50 has a total pressure of 2.07 x 10^4 kPa, then what is the partial pressure of nitrogen? a). 1.04 x 10^4 kPa
x b). 8.3 x 10^3 kPa
c). 2.07 x 10^3 kPa
d). 2.07 x 10^4 kPa

Answers

The answer is B. 8.3x10^3 kPa. The partial pressure of a specific gas in a gas mixture is equivalent to product of its mole fraction and total pressure of the mixture. Since it was stated that the mixture is 10% oxygen, 50% helium, and the rest nitrogen, it can be determined that nitrogen is 40% of the mixture. So 40% of 2.07x10^4 kPa is 8.3x10^3 kPa.

Answer:

A) 1.04 x 10^4 kPa

Explanation:

I'm not exactly sure how but I took the test and this was the correct answer. My calculations said it was B as well but I guess not...

"For a many-electron atom, which of the following sublevels has the highest energy? A. 3p. B. 3d. C. 3s. D. 4s".

Answers

Empty 4s orbitals are slightly lower in energy than empty 3d orbitals however, in the context of this question, in a many electron atom where the 4s orbitals are filled, they are repelled to a higher energy level than 3d orbitals and hence the answer should be D.

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