HELP ME SOLVE THIS PLEASE

Answer:

O, S, Se, Te, Po

Explanation:

Oxygen, sulphur, selenium, tellurium and polonium are all members of group sixteen. The elements in group sixteen all possess six electrons in their outermost shell. Recall that an atom is said to stable if it contains eight electrons in its outermost shell. This is also referred to as the octet rule. Hence atoms of elements obey the octet rule when they combine to form compounds with eight electrons present on the outermost shell of each atom.

Having six electrons on their outermost shell implies that they need to gain two electrons by bonding to other atoms of other elements. Two examples will suffice here.

Water is formed when an oxygen atom shares an electron with each hydrogen atoms.

Hydrogen sulphide is formed when sulphur share two electrons with two hydrogen atoms. Hence the answer.

Answer:

O, S, Se, Te, Po

Explanation:

Hello,

In this case, when chemical bonds are formed, the valence electrons are the bridge to make it possible, nevertheless, the octet is the limit for the formation of bonds, that is, an element must not exceed 8 shared or gained electrons. In such a way, elements able to gain to electrons to attain the octet are those from the VIA group: O, S, Se, Te, Po, as they have six valence electrons, so two more electrons are suitable for attaining the octet.

Best regards.

Answer:

D. 91.0%

Explanation:

Hello,

In this case, for the given chemical reaction:

[tex]Na_2S+2AgNO_3 \rightarrow Ag_2S + 2NaNO_3[/tex]

Next, since silver nitrate (molar mass 169.87 g/mol) is in a 2:1 molar ratio with silver sulfide (molar mass 247.8 g/mol), we compute its theoretical yield as shown below:

[tex]m_{Ag_2S}^{theoretical}=4.27gAgNO_3*\frac{1molAgNO_3}{169.87gAgNO_3} *\frac{1molAg_2S}{2molAgNO_3}*\frac{247.8gAg_2S}{1molAg_2S}\\\\m_{Ag_2S}^{theoretical}=3.11gAg_2S[/tex]

Next, we compute the percent yield as:

[tex]Y=\frac{m_{Ag_2S}^{actual}}{m_{Ag_2S}^{theoretical}}*100\% =\frac{2.86g}{3.11g} *100\%\\\\Y=91.0%[/tex]

Hence, answer is D. 91.0%.

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Answer:

Pretty sure its salt water, my apologies if its wrong

Explanation:

Answer:

Sugar water :) took the test lol

Explanation:

Answer:

Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids.

Explanation:

Answer:

D. 2.5 dm3

Explanation:

Alright, first off, you gotta find how many moles Sodium Hydroxide (NaOH) has.

20.0g NaOH x (1 mol / 40.0g NaOh (got amount from Periodic Table))

Basically, it's 20.0g / 40.0g, which gives 0.5 mol since the grams cancel each other. Then we know the pyramid (mol / M x L) so...

0.5 mol x 0.20 M = 2.5 dm3

Answer:

I did not understand the question

Answer:

The black atoms

Explanation:

Answer: Red Plate Dinner

Explanation:

If we calculate them with formula for area of circle([tex]\pi[/tex][tex]r^{2}[/tex]).

Red Plate - [tex]\pi[/tex][tex]6^{2}[/tex] = 36[tex]\pi[/tex]

2 Yellow Plate - 2 * [tex]\pi[/tex][tex]3^{2}[/tex] = 2 * 9[tex]\pi[/tex] = 18[tex]\pi[/tex]

The Red Plate has a bigger area, so the Red plate has more area.

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Answer:

Explanation: If the rate doubles when the concentration of reactant is doubled, the reaction is the first-order. If the rate becomes 4-fold times (quadruples) when the concentration of the reactant is doubled, the reaction is the second-order and similarly, the third, the fourth, and the higher orders.

Answer:

Si se usan 50 gramos de calcio y óxigeno, se obtienen 70 gramos de óxido de calcio.

Explanation:

Hola,

En este caso, la reacción llevada a cabo es:

[tex]2Ca+O_2\rightarrow 2CaO[/tex]

De este modo si asumimos el ejemplo dado, 50 gramos de calcio, cuya masa atómica es 40 g/mol y 50 g de oxígeno, cuya masa atómica como gas diatómico es 32 g/mol, antes de calcular los gramos de óxido de calcio producidos, debemos identificar el reactivo límite. Así, calculamos las moles de calcio disponibles en 50 g:

[tex]mol_{Ca}^{disponible}=50gCa*\frac{1molCa}{40gCa} =1.25molCa[/tex]

Y también las moles de calcio consumidas por los 50 g de oxígeno, utilizando su relación molar 2:1:

[tex]mol_{Ca}^{consumidas\ por\ O_2}=50gO_2*\frac{1molO_2}{32gO_2} *\frac{2molCa}{1molO_2} =3.125molCa[/tex]

Por lo tanto, hay menos calcio disponible que el que consume el oxígeno, por lo que el calcio esel reactivo límite. Ahora, con este, calculamos los gramos de óxido de calcio, cuya masa molar es 56 g/mol, que se producen:

[tex]m_{CaO}=1.25molCa*\frac{2molCaO}{2molCa}* \frac{56gCaO}{1molCaO}\\ \\m_{CaO}=70gCaO[/tex]

Esto quiere decir que de 50 gramos de oxígeno, solo 20 gramos reaccionan para formar 70 gramos de óxido de calcio.

Saludos!

Answer:

69.9 g of CaO will be produced. ≅ 70 g

Explanation:

First of all you need to make the reaction:

2Ca + O₂ → 2 CaO

Determine the moles of each reactant:

10 g Ca / 40.08 g/mol = 0.25 moles

4 g O₂ / 32 g/mol = 0.125 moles

There is no limiting reagent in this reaction, we can use both elements.

Ratio between Ca and CaO, is 2:2. For 0.25 moles of Ca I would make 0.25 moles of CaO. We convert the moles to mass:

0.25 mol . 56.08 g / 1mol = 14 g

Let's think when you have the same mass of reactant:

50 g Ca/ 40.08 g/mol = 1.24 moles

50 g O₂ / 32 g/mol = 1.56 moles

For 1 mol of oxygen I need 2 moles of calcium, so If I have 1.56 moles, I would need the double, 3.12. Notice that Ca is the limiting reagent (we need 3.12 moles of reactant, but we only have 1.24). Now we need to work with it. If 2 moles of Ca, makes 2 moles of CaO, then 1.24 moles, will produce the same amount of oxide. We finally convert the moles to mass: 1.24 mol . 56.08 g/mol = 69.9 g

Answer:

[tex]p[H+] = 10.042[/tex]

Explanation:

As we know that

[tex]pKw = pH + pOH[/tex]......eq (1)

we will calculate the pH of OH- and then we will calculate the pH of H+

So p[OH-] [tex]= - log [1.10 * 10^{-4}][/tex]

Solving the right side of the equation, we get

p[OH-]

[tex]= - [-3.958]\\= 3.958[/tex]

Now we know that

[tex]pKw = 14.0[/tex]

Substituting the value of pOH in the above equation, we get -

[tex]14.0 = p[H+] + 3.958\\p[H+] = 14 - 3.958\\p[H+] = 10.042[/tex]

Answer:

pOH = 8

Explanation:

There are many formulaes to go from pH to pOH. One of my favorites is this one:

pH+pOH=14  (Now this just becomes an algebra problem because you already know pH value)

6 + pOH = 14 (subtract 6 from both sides)

pOH= 8

Answer:so that they may not get confused in which container did they place which chemical since some chemicals are simmilar in colour

Explanation:

The scientists labeled all containers so that they will sure about which container did they put which chemical in since some of the chemicals are similar in color or some are colorless.

Labeling in a lab is extremely important for many reasons. The laboratory is a fast-paced and efficient work zones due to proper workflow and organization.

Labeling helps to make sure that scientists are working with the correct samples or materials. Without labels, they run the danger of using the wrong chemicals or materials in experiments. This can cause experiments to fail and wastes time, resources, and funds or more than that.

Therefore, it is important for materials to work with by using labeling, as it ensures they are stored in the proper containers. The scientists label the containers to avoid confusion about the material being mixed with other materials.

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Answer:

Flerovium

Explanation:

Answer:

Fl or flerovium. Atomic number is the number above the element on a periodic table.

Answer:

the percentage is 1 every 5

Explanation:

Answer:

C) Precipitation

Explanation:

Above reaction forms the precipitate of [tex] Mg(OH)_2[/tex](Magnesium Hydroxide). Hence, it is Precipitation reaction. This reaction is also known as Double displacement reaction.

Answer:b

Explanation:

Answer:

factors affecting solubility

Temperature. Basically, solubility increases with temperature. ...

Polarity. In most cases solutes dissolve in solvents that have a similar polarity. ...

Pressure. Solid and liquid solutes. ...

Molecular size. ...

Stirring increases the speed of dissolving.

Explanation:

google hope this helps you thank you for helping me

Answer:

Answer:

Pressure

Explanation:

Basically, Pressure equals Force, divided by the area.

The measure of how much force is acting on a given area is known as pressure. It measures how concentrated a force is. The size of the force is represented by a simple relationship: Force = Pressure × Area.

The term pressure is defined as the amount of force applied perpendicular to the surface of an object per unit area. It is represented by symbol "p" or P.

Pressure is Force per Unit Area. Pressure also defined as the force on an object that is spread over a surface area. The equation for pressure is the ratio of force and the area where the force is applied.

Force is measured in units of Newtons (N), named after the famous scientist Isaac Newton.

Thus, The size of the force is represented by a simple relationship: force = pressure × area.

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Answer:

A fatty acid is made of a polar carboxylic acid functional group and a nonpolar hydrocarbon tail.

Explanation:

A fatty acid is made of fat-soluble components, that consists of a large (more than 4 carbon atoms) aliphatic chain of carbon atoms, with hydrogen atoms and a carboxyl group (-COOH). The named fatty acid is because of the -COOH group.

The chain can be made of carbon atoms with a single bond, (saturated) or with double or triple bonds (unsaturated). When the fatty acid has just one double bond the fatty acid is monounsaturated, and otherwise, if it has multiple double bonds it is polyunsaturated. Fatty acid chains can be different in their lengths and their degree of unsaturation.          

Mostly of the tail of the fatty acid is nonpolar and hence, hydrophobic, because the long-chain made of hydrocarbon atoms.

From all of the above, the correct answer is option b: A fatty acid is made of a polar carboxylic acid functional group and a nonpolar hydrocarbon tail.

I hope it helps you!

Answer:Acids taste sour, react with metals, react with carbonates, and turn blue litmus paper red. Bases taste bitter, feel slippery, do not react with carbonates and turn red litmus paper blue.

Explanation:

Answer:

Answer Choice D

Explanation:

Study Island Question

Answer:

8. the formula of the products are CO2(g) , H2O (l) and NaCl (aq)

Explanation:

s- solid

g- gas

l- liquid

aq- aqueous, means acid

These are the products of the equation, you can balance this by searching up a video on how to do so, or use a balance equations calculator online. Balancing is very easy tho.

Answer:  C. enzyme

Explanation:

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.

Enzymes are proteins that reduce the activation energy of biological reaction. Enzymes increase the speed of a reaction and help it to run faster. Thus they are also called as bio catalysts.

Activated complex is the transition state which is very unstable and is formed during the course when reactants are converted to products.

Answer:

a. Silver; chlorine  

b. One atom of Ag; one atom of Cl

c. Two atoms total

Explanation:

Answer: alr, gimme a sec

Answer:

Okay I will go look at it

25.4 g of salt was dissolved in distilled water to make 425 mL of solution. 5.94 percent m/v concentration.

The term concentration is defined as a substance is the quantity of solute present in a given quantity of solution. Concentrations are mostly expressed in terms of molarity which is defined as the number of moles of solute in one litre of solution.

Concentration is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.

Concentration = mass / volume

Mass =  25.4 g

Volume = 425ml

Concentration = 25.4 g / 425ml x 100

=5.94 percent

Thus, 25.4 g of salt was dissolved in distilled water to make 425 mL of solution. 5.94 percent m/v concentration.

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Answer:

Option C, developmental view point

Explanation:

A person with preservationist viewpoint will think of only preserving the natural resources and the environment. While a person with a conservationist viewpoint will think of conserving the landscape, architecture, heritage, culture, buildings, rituals, etc.  

However, a person with developmental viewpoint will think of developing resources at ease. He/She will prioritize development and comfort of customer above all.  

Hence, option C is correct

Answer:

120 kPa = 1.25 L

Explanation:

Because 120/1.50 is 80. And then if you divide 100 by 80, you get 1.25.