How many atoms of oxygen are present: 3Al2(SO4)3
a. 36
b. 12
c. 10
d. 24

Becquerel  did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks

The phenomenon of radioactivity was discovered by the French scientist Henri Becquerel in 1896 when he placed photographic paper in a drawer with some radioactive rocks.

We have to note that Becquerel did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks hence the stetement is false.

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Answer:

386.75 grams

Explanation:

You can use dimensional analysis to help you solve for this question

1. set up a proportion

                          x grams

4.25 mol x        x mole

2. to find the amount of grams/mol that are in NiS we find the gram formula mass (mass of all the atomic masses of each element)

Ni- 59 grams

S- 32 grams

add these together and you get 91 g/mol

3. now plug in the values and multiply across

                    91 grams

4.25 mol x     1 mole

when you multiply across this is equal to 386.75 grams

Explanation:

36.5 g of HCl occupies 2.24×10-2m3 . ∴ 73 g of HCI at STP will occupy 2.24×10-236.5×732=4.48×10-2m3.

Balanced equation:

NaCl + ( 1 ) AgNO₃ → ( 1 ) AgCl + ( 1 ) NaNO₃

(aq)               (aq)                (s)              (aq)

Both the sides are already balanced

According to its location in the periodic table:

It is a table in which elements are ordered in Groups (columns) and Periods (rows).

According to their ubication and properties they can be classified in:

Let's locate and classify the following elements:

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calcium chloride and carbon dioxide

Answer:

About 0.164 g of glucose.

Explanation:

We can determine the mass of glucose produced given the volume of oxygen gas produced with stoichiometry.

Recall that at STP, a mole of any gas occupies a volume of 22.4 L.

From the reaction, six moles of oxygen gas is produced for every one mole of glucose.

Lastly, the molecular weight of glucose is 180.18 g/mol.

Therefore:
[tex]\displaystyle \begin{aligned} 122\text{ mL O$_2$} & \cdot \frac{1\text{ L O$_2$}}{1000\text{ mL O$_2$}}\cdot \frac{1\text{ mol O$_2$}}{22.4\text{ L O$_2$}} \cdot \frac{1\text{ mol C$_6$H$_{12}$O$_6$}}{6\text{ mol O$_2$}} \cdot \frac{180.18\text{ g C$_6$H$_{12}$O$_6$}}{1\text{ mol C$_6$H$_{12}$O$_6$}} \\ \\ & = 0.164\text{ g C$_6$H$_{12}$O$_6$}} \end{aligned}[/tex]

Therefore, about 0.164 g of glucose is produced.

#1

Intermolecular bonds:-

#Carbon monoxide

Formula:-

Molecular geometry

Drawing

Bonds=3

#Silicon tetrafluoride

Formula

geometry

Bonds=4

#Titanium (4) Sulfide

Geometry

Bonds=2

-0.109 is the answer :)

You could basically just do column subtraction

Answer:

The molecules are held together by intermolecular force of attraction. More the force the fusion takes after some time only that means the melting point is high. So molecules with greater molecular forces have high melting point and less molecular forces have low melting point.

Answer:

On heating a solid, the kinetic energy of the particle increases. The particle start vibrating with greater speed. The energy supplies by heat overcomes the force of attraction between the particles.

If this force of attraction is more, then more heat energy will be necessary to overcome this force. So, the melting point of the solid will be higher.

False, there are 9 named classes of hazardous materials.

Hazardous materials are substances or chemicals that pose a health hazard, a physical hazard, or harm to the environment.

There are 9 hazardous substances symbols you need to know: flammable, oxidising, explosives, gas under pressure, toxic, serious health hazard, health hazard, corrosive and environmental hazard.

Hence, the statement is false.

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Answer:

Strong acids completely dissociate in water to H+ ions and extremely weak conjugate base anions.

Explanation:

its a weak acid

Answer:

because its didn't form H+ ions when react with water

Answer:

By mixing two solutions of differing pH values, the final pH of the mixed solution is going to be a function of the pH-, or the hydrogen ion (H+), of the lower pH solution, and the final volume. The hydrogen ion(H+) of the higher pH solution has little to no effect in the final pH value.

For a (unbalanced) reaction: NaOH +CO2-Na2CO3 + H2O, the moles of NaOH and moles of each product are formed are mathematically given as

a) Moles of NaOH =44.05

b)   Moles of Na2CO3=21.0

Generally, the equation for the Chemical reaction  is mathematically given as

2 NaOH(aq)+ CO2(g)------> Na2CO3(aq)+ H2O(l)

Therefore

Moles of CO2= 925/44

Moles of CO2=21.0

Hence

Moles of NaOH = 2 x Moles of CO2

Moles of NaOH = 2x925/44

Moles of NaOH =44.05

In conclusion

Moles of Na2CO3 925/44

Moles of Na2CO3=21.0

And

Moles of H2O= 925/44

Moles of H2O= 21.0

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Yes it will.

Explanation:

 At cooking temperature the concentration of ethanoic acid may be affected as the solution will boil therefore evaporating the water that will increase the concentration of acid in the solution.

Answer:

113 ml

Explanation:

PV = nRT      remember T must be in Kelvin  Volume in L  

270 * .4 =  n 62.4*  338.15

n = .005118

1.4 atm = 1.4 * 760 = 1064 mm

1064 * V = .005118 * 62.4 * 373.15

V = .113 l

Answer:

0.0562

Explanation:

Ph=-log[H+]

to find the h+ is the antilogarithm of the Ph.

Which is 10 raised to the power - Ph.

Answer:

5.62

-2

Explanation:

What is the H+ concentration in a solution with a pH of 1.25? Round to the nearest hundredth.

5.62 × 10n M n= -2

Answer:

A

Does it live on land or sea.

Answer:

C:

I would check that does it have hair or not because hair provides info about the DNA which can help me if that specific animal has evolved from DNA of any other animal..

Hope it helped you.

Answer:

Explanation:

The quick and short answer to this question is that the moment it is made into Na (the atom) the moment that happens, Na will react with water to become NaOH. Sodium is very responsive to water.

Equation

2Na  + 2HOH ====> 2NaOH + H2

If a 50.00 mL of 0.0155 M HI(aq) is mixed with 75.00 mL of 0.0106 M KOH(aq), the pH of the final solution  is mathematically given as

pH=13.16

Generally, the equation for the Chemical reaction   is mathematically given as

2HI+Ba(OH_2)--->BaI2+2H2O

Therefore

pOH=-log{OH}

pOH=-log(6.52)

pOH=0.8142

In conclusion, for the pH

pH+pOH=14

pH=14-0.8142

pH=13.16

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The combination of glue and water creates a physical change rather than a chemical change.

Physical changes are changes to the physical properties of materials and are usually reversible.

Chemical changes, on the other hand, are changes to the chemical properties of materials and are usually irreversible.

Mixing water with glue will only result in the glue being diluted with water and creates no chemical reaction. The glue can be recovered by distilling off the water.

Thus, mixing glues with water is only a physical change as the chemical properties of the glue remain intact.

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Answer:

6.022×1023 individual items of that something. You have 3 moles, so there are 3×6.022×1023 oxygen molecules

Explanation:

6.022×1023 individual items of that something. You have 3 moles, so there are 3×6.022×1023 oxygen molecules

Answer:

a

Explanation:

On drawing the structure, the most Carbon atoms in a row is 5

The remaining two carbon atoms are connected to the 2nd carbon atom

IUPAC name is :

Answer:

A

Explanation:

.75 + .25 + 1.25 = 2.25 atm

1 atm is 760 mm hg

2.25 * 760 = 1710 mm HG

Answer:

[tex]\huge\boxed{\sf 2.25\ atm = 1710\ mm\ of\ Hg}[/tex]

Explanation:

Partial pressure of gas A = 0.75 atm

Partial pressure of gas B = 0.25 atm

Partial pressure of gas C = 1.25 atm

Total partial pressure = 0.75 atm + 0.25 atm + 1.25 atm

= 2.25 atm

We know that:

1 atm = 760 mm of Hg

Multiply 2.25 to both sides

2.25 atm  = 760 × 2.25 mm of Hg

2.25 atm = 1710 mm of Hg

[tex]\rule[225]{225}{2}[/tex]

Answer:

probably the last one should hbthrbwhdee.

Answer:

it brings oxygen into the blood and removes carbon dioxide

Explanation:

Answer:

Cf4 + 2Br2 gives CBr4 +2F2

Explanation:

b/c there are balanced

The simplest way to make the color gray is by mixing white and black colors, but it can also be created by mixing colors such as red and green.

This is considered a neutral and cool color that can be naturally found in elements such as rocks.

This would not be a neutral gray as it will resemble a little bit the original colors.

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Answer:

The water in the hydrate (referred to as "water of hydration") can be removed by heating the hydrate. When all hydrating water is removed, the material is said to be anhydrous and is referred to as an anhydrate.

Explanation:

If the water is not completely removed from salt during heating process it will result in higher mole ratio of water to salt as mass of water will also be accounted while calculating mole ratio.

Salt is defined as a chemical compound which is ionic in nature and consists of cation and an anion.It has no net electrical charge as the charges are completely neutralized in case of salts.

They are classified as acidic, basic or neutral salts depending on the ions they produce on dissolution.They have wide variety of colors depending on the elements from which they are formed and have five basic tastes.Salts are usually odorless  except a few exceptions . They are highly soluble in water and are insulators in the solid state, to make them conductive they need to be melted or dissolved.

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