What does the big 2 in 2CO2 mean?

Answer:

Beryllium metal is relatively unreactive at room temperature, particularly in its massive form. Magnesium is more electropositive than the amphoteric beryllium and reacts more readily with most of the nonmetals.

Explanation:

When it comes to the ease with which a positive ion or cation of the metal can form, beryllium is less reactive than magnesium.

The chemical element magnesium has the atomic number 12 and the letter Mg as its symbol. It is a glossy, gray metal with a low melting point, high chemical reactivity, and a low density. It only naturally occurs in mixtures with other elements, just like the other alkaline earth metals, and it almost always has an oxidation state of +2.

At room temperature, beryllium metal is largely non-reactive, especially in its massive form. Magnesium interacts more quickly with the majority of nonmetals because it is more electropositive than amphoteric beryllium.

Due to the electron being removed being in the 3-level rather than the 2-level and being further away from the nucleus's attraction, the first ionization energy of magnesium is lower than that of beryllium.

Thus, When it comes to the ease with which a positive ion or cation of the metal can form, beryllium is less reactive than magnesium.

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Answer:

?

Explanation:

Molarity is the molar concentration of the moles in a solution. The volume of water required for preparing 1.50 M NaCl solution is 1.7 L.

Volume is the number of moles of solute present in a molar concentration of a solution.

Molar concentration is given as,

[tex]\rm Molarity (M) = \dfrac{\text{moles of solute}}{\text{litres of solution}}[/tex]

Given,

Molarity of sodium chloride = 1.50 M

Number of moles of sodium chloride = 2.55 mol

Substituting values in the above equation the volume is calculated as:

[tex]\begin{aligned}\rm Volume &=\rm \dfrac{moles}{molarity}\\\\&= \dfrac{2.55}{1.50}\\\\&= 1.7 \;\rm L\end{aligned}[/tex]

Therefore, 1.7 L of water is required.

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[tex]\huge{\mathbb{\tt {QUESTION:}}}[/tex]

What makes a radioactive decay chain end?

OA. The final element has the longest half-life.

OB. All mass has been converted to energy.

OC. The radiation is absorbed by something.

OD. The final product is not radioactive.

[tex]\huge{\mathbb{\tt {ANSWER:}}}[/tex]

D. The final product is not radioactive

[tex]\huge{\mathbb{\tt {EXPLANATION:}}}[/tex]

A radioactive decay chain will end when the last particle formed is stable. The initial radioactive isotope is called the parent isotope.

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A decay chain will end only when the final product is not radioactive.

The term radioactivity has to do with the sponteanous disintegration of an atom with the emission of radiation. Usually, there are radioactive decay series for different isotopes.

A radioactive decay series will continue untill a stable isotope is formed hence, a decay chain will end only when the final product is not radioactive.

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Answer:

Kingdom Monera.

Explanation:

The unicellular organisms the student observed were most likely from the Kingdom Monera because in this kingdom, unicellular organisms are included which are prokaryotic in nature. Monera is a Greek word means "single" is a kingdom that contains organisms that are made up of one cell and having a prokaryotic cell means having no nuclear membrane and we know that bacteria is also a unicellular organism and prokaryotic in nature.

Answer:

pOH = 4.63

pH = 9.37

Explanation:

Because NaOH is a strong base, it will completely dissociate, which means you can find pOH by taking the negative log of the concentration of hydroxide ions: pOH = -log(OH) = -log(2.34 x 10⁻⁵) = 4.630784143

To find pH use 14.00 = pH + pOH

pH = 14.00 - 4.630784143 = 9.369215857

Answer:

lol global warming is the gradual increase in the temperature of the earth and its atmosphere. this is do to the greenhouse effect caused by increased levels of carbon dioxide.

Explanation:

common knowledge

Answer:

It would be A

Explanation:

Answer:

A - wind

Explanation:

A low pressure system is a whirling mass of warm, moist air that generally brings stormy weather with strong winds. When viewed from above, winds spiral into a low-pressure center in a counterclockwise rotation in the Northern Hemisphere.

Answer:

Mass to moles: mass/molar mass=mole

Moles to mass: moles x molar mass = mass

Moles to particles:1mole = 6.022x10^23 particles

Particles to moles: 1 particle =1/(6.022x10^23) mole

Explanation:

Answer:

True

Explanation:

Answer:

Liquid water  

Answer:

n = 0.223 mol.

Explanation:

Hello there!

In this case, according to the given information, it is possible for us to approach this problem via the ideal gas law, which involves the pressure, moles, temperature and volume of the gas:

[tex]PV=nRT\\\\[/tex]

Thus, by solving for moles we obtain:

[tex]n=\frac{PV}{RT}[/tex]

Therefore, we plug in the given volume, temperature (in Kelvins) and pressure to obtain:

[tex]n=\frac{0.9atm*8L}{0.08206\frac{atm*L}{mol*K}*(120+273)K} \\\\n=0.223mol[/tex]

Best regards!

Answer:

-114.6°C is the new freezing point

Explanation:

The addition of a solute to a pure solvent produce the decreasing in the freezing point (Freezing point depression, Colligative property). The equation to find the new freezing point of the mixture is:

ΔT = Kf*m*i

Where ΔT is the change in the freezing point,

Kf is the freezing point depression constant of the solvent = 1.99°C/m

m is molality of the solution (Moles of solute / kg solvent)

i is Van't Hoff factor = 1 for nonelectrolytes

Molality of the solution is:

Moles glucose -Molar mass: 180.156g/mol-

10.3g * (1mol / 180.156g) = 0.05717 moles

kg of solvent:

250g * (1kg / 1000g) = 0.250kg

Molality = 0.05717 moles / 0.250kg =

0.2287m

ΔT = 1.99°C/m*0.2287m*1

ΔT = 0.46°C

As the freezing point of ethanol is -114.1°C, the freezing point of te solution is:

-114.1°C - 0.46°C

= -114.6°C is the new freezing point

Question: Calculate the mass of magnesium chloride you would need to dissolve in 4dm³ of water to

make a 0.9g/dm³ solution.

Answer:

3.6 g

Explanation:

From the question,

Density of magnesium (D) = Mass of magnesium (m)/Volume of magnesium(V)

D = m/V............... Equation 1

Make m the subject of the equation

m = D×V............. Equation 2

Given: D = 0.9 g/dm³, v = 4 dm³

Substitute these values into equation 2

m = 0.9×4

m = 3.6 g.

Hence the mass of magnesium is 3.6 g.

One mole of NaOH = 40g NaOH

One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in water

One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in wateraccording to the given data,

One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in wateraccording to the given data,we have 6 moles of NaOH so we need 6 litres of Water olto prepare 1M Solution

Answer:

najsbsbsmnshzhskwjzhhsbsbsbsbzbbsnzn

hsnznzkskzjbxbs

gasjhsjsbabakjahajakqjahsvhwksbxbwhsjkxjsjshshshshshhshshshsjshxhsbsbsbsbhshshdbdbbdbdbdhbsjajshshshsjsksksjsjsjjsbsksshshssgsgsbsbvsgsbsjsksjsjxjxjksksjgshkajahsgshsjsjabavsvshwhsggehsjsjsjdnsjajs

Answer:

uhh the Neutron i guess lol you didn't give any choices or explanation

Explanation:

Explanation: the answer plant seeds

not skin

Answer:

143 parts I think probably not

Answer: The new pressure of the balloon is 108 kPa

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 105 kPa

[tex]P_2[/tex] = final pressure of gas = ?

[tex]V_1[/tex] = initial volume of gas = 2510000 L

[tex]V_2[/tex] = final volume of gas = 2600000 L

[tex]T_1[/tex] = initial temperature of gas = [tex]122^0C=(122+273)K=395K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]150^0C=(150+273)K=423K[/tex]

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

[tex]\frac{105\times 2510000}{395}=\frac{P_2\times 2600000}{423}[/tex]

[tex]P_2=108kPa[/tex]

The new pressure of the balloon is 108 kPa

Answer:

The plateaus or horizontal lines on the graph represent the transition between states of the sample. The first plateau represents the melting (or transition from solid to liquid) and the second plateau represents boiling (or transition from liquid to gas).

Explanation:

Answer:

Explanation:

Answer:1.635

⋅

10

24

Explanation: yes

There are 6.02 × 10²³ molecules in one mole or 18 g of water. Then, 10 lbs that is 4535.9 g or 251.9 moles of water contains 1.51 ×10²⁶ water molecules.

One mole of every substance contains 6.02 × 10²³atoms of it. This number is called Avogadro number. Hence, one mole of every element contains Avogadro number of atoms.

Similarly one mole of every compound contains Avogadro number of its molecules. The mass of one mole of a compound is called its molar mass.

The molar mass of water = 18 g

one mole or 18 g of water contains 6.02 × 10²³ molecules.

1 lbs = 453.59 g

then 10 lbs = 4535.9 g

number of moles in 4535.9 g of water =4535.9 g / 18 /mol = 251.9 mol.

Then,

number of moles in 251.9 moles  = 251.9 × 6.02 × 10²³ = 1.51 ×10²⁶

Therefore, there will be 1.51 ×10²⁶ water molecules in 10 lbs of water.

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OA soil and molecules of suger