If a 0.7 M solution of Ca(OH)2 dissociates completely in water, what is the
final [OH-]?

Answer:b

Explanation:

Answer:

98 g/mol

Explanation:

La masa molar de un compuesto es la cantidad de materia (medida como masa) que hay en 1 mol de dicho compuesto. Por lo tanto, puede calcularse como sigue:

masa molar = masa/número moles

Tenemos los siguientes datos del compuesto Y:

masa Y = 196 g

número de moles de Y = 2 mol

Entonces, podemos calcular la masa molar de Y de la siguiente manera:

masa molar Y = (masa Y)/(número de moles de Y) = 196 g/2 mol = 98 g/mol

Answer:

e

Explanation:

a

Conclusion:

sports

Answer:

A solution whose pH=1 is ten times more acidic than the solution whose pH=2.

Explanation:

Answer: True

Explanation:

Answer: The alkyne

Explanation:

Answer:

the alkyne

Explanation:

Hope it helps u

FOLLOW MY ACCOUNT PLS PLS

Answer: A- 1 day

Explanation: I really hope that helped. BYE!!

1 day is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days

Answer: OCl2 is polar because the two O-Cl bond dipoles don't cancel each other.

Answer:  waning gibbous

Explanation:

Answer:

the last one

Explanation:

liquid at room temp

Answer: 0.040 mol/l

Explanation: Molarity c = n/V (Concentration)

c = 0.060 mol / 1,5 l = 0,040 mol/l

Answer: Radon is radioactive

Explanation: thats all i know

Answer:

yep.. I am wide awake here.

yep

ExPlAnAtIoN:

yezs and nozs

Answer:

the answer is b: it shows how temperature of a substance changes when heated

Answer:

Hydrocarbons

Hydrocarbons are chemical compounds that contain the elements carbon and hydrogen only. They are compounds that are obtained from the fossil fuel crude oil by a process called fractional distillation.

Fractional distillation

Fractional distillation separates the crude oil mixture into a number of smaller, different parts called fractions. The fractionating column is hot at the bottom and cool at the top. Substances with high boiling points condense at the bottom and substances with lower boiling points condense on the way to the top.

The crude oil is evaporated and its vapours condense at different temperatures in the fractionating column. Each fraction contains hydrocarbon molecules with a similar number of carbon atoms, smaller molecules nearer the top and longer molecules nearer the base of the column.

Oil fractions

The diagram below summarises the main fractions from crude oil and their uses and the trends in properties. Note that the gases leave at the top of the column, the liquids condense in the middle and the solids stay at the bottom.

Explanation:

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The substances which are generally used to generate heat and light energy on burning are called fuels. The diesel fuel contains the largest molecules. Thus option A is correct.

The diesel fuel which is also called the diesel oil is found to be a combustible liquid and it is produced from the fractions of crude oil. The diesel fuel is found to be less volatile than the gasoline.

The chemical composition of a diesel fuel is usually denoted as C₁₂H₂₄. Apart from the carbon and hydrogen atoms small amounts of 'S', 'N' and 'O' are also present in the diesel.

Here gasoline is a derivative product obtained by the fractional distillation of crude oil and it is generally used in passenger vehicles whereas kerosene is a highly flammable liquid obtained from the distillation of petrol and is less volatile than gasoline.

The gasoline contains only 4 to 12 'C' atoms per molecule and it is a lightweight hydrocarbon mixture. The number of 'C' atoms in kerosene ranges from 10 to 16 per molecule and the diesel fuel is known as the heavyweight hydrocarbon mixture with 8 to 21 'C' atoms per molecule.

Thus diesel fuel consists of larger hydrocarbon molecules than gasoline and kerosene.

Thus the correct option is A - Diesel.

To know more about Fuels, visit;

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Answer:

Average atomic mass = f1M1 + f2M2 +… + fnMn where f is the fraction representing the natural abundance of the isotope and M is the mass number (weight) of the isotope. The average atomic mass of an element can be found on the periodic table, typically under the elemental symbol.

Answer: An amount of [tex]40980.48 J/g^{o}C[/tex] heat is required to raise the temperature of 4.64kg of lead from 150°C to 219°C.

Explanation:

Given: mass of lead = 4.64 kg

Convert kg into grams as follows.

[tex]1 kg = 1000 g\\4.64 kg = 4.64 kg \times \frac{1000 g}{1 kg}\\= 4640 g[/tex]

[tex]T_{1} = 150^{o}C[/tex]

[tex]T_{2} = 219^{o}C[/tex]

The standard value of specific heat of lead is [tex]0.128 J/g^{o}C[/tex].

Formula used to calculate heat is as follows.

[tex]q = m \times C \times \Delta T[/tex]

where,

q = heat energy

m = mass of substance

C = specific heat of substance

[tex]\Delta T[/tex] = change in temperature

Substitute the value into above formula as follows.

[tex]q = m \times C \times \Delta T\\= 4640 g \times 0.128 J/g^{o}C \times (219 - 150)^{o}C\\= 40980.48 J/g^{o}C[/tex]

Thus, we can conclude that [tex]40980.48 J/g^{o}C[/tex] heat is required to raise the temperature of 4.64kg of lead from 150°C to 219°C.

Explanation:

Fertilizers are chemically synthesized plant nutrients.

Nitrogen (N), Phosphorus (P) and Potassium (K) are macronutrients and are required in large amounts by plants. So, farmers use fertilizers in order to supply these nutrients. NPK 15:15:15 , NPK 20:20:20, NPK 15:30:15 are examples of fertilizers used to supply N, P, K to crops.

Explanation:

1.Potassium Nitrate(KNO3)

2.Potassium Sulphate(K2SO4)

They provide potassium to plants for making their roots and shoots healthy.

Answer:

A) It tends to increase from top to bottom of a group

Answer:

Explanation:

Weeds and Small Plant Roots Exploit Existing Concrete Cracks

Instead, the plant's roots take advantage of existing microscopic cracks. New cell growth takes place at the tips of plant roots. ... Eventually, molecule by molecule, the plant's growth can force its way into the slab and create a surface crack.

Answer:

A motor (device that converts electrical energy into kinetic energy) runs by using the magnetic field formed by a flowing current formed into a loop.

Answer:

Fe2 + O2 > FeO

Explanation:

I don't know how to make the letters small...

Answer:

5km/hour

Explanation:

2hours = 10km

/2              /2

1 hour = 5km

An ambulance took 2 hours to cover a distance of 10 kilometers. Find its speed.

Distance = 10 kilometers.

Time = 2 hours.

Its speed.

We know,

[tex] { \boxed{\bf{\rm \red {Speed \: = \: Distance \: × \: Time}}}} [/tex]

Speed = 10 kilometers × 2 hours

Speed = 20 km/hr

Answer:

the answer is seventeen

Answer:

Explanation:

At STP 1 mole of an ideal gas = 22.4 L.

Assuming SO2 (sulfur dioxide) acts as an ideal as, we have 16 g SO2 x 1 mol/64 g = 0.25 moles SO2

0.25 moles x 22.4 L/mole = 5.6 liters

Answer:

22km

Explanation:

Las velocidades de los móviles nos van a definir cuánta distancia recorren por unidad de tiempo. Para resolver este problema debemos hallar la distancia recorrida en una hora por cada vehículo (Porque de las 12 horas a las 13 solo hay una hora)

Un móvil está recorriendo 50km/h. En una hora recorrerá: 50km

El otro móvil recorre 20m/s. En km/h:

20m/s * (3600s / h) = 72000m/h * (1km / 1000m) = 72km/h. El móvil recorrerá, en una hora, 72km

1h = 3600s; 1km = 1000m

La distancia que los separa es de:

72km - 50km =

22km

Answer:

97.7 kJ

Explanation:

We'll use the formula for specifc heat: Q=mcΔT

Q= heat/energy (Joules), m= mass (grams), c= specific heat (different for each substance and is usually given)

ΔT= final temperature - initial temperature

Let's check our given units and see if they're the correct, here they all are. Let's plug in what we know.

Q=mcΔT

Q=(480)(0.96)(234 - 22)

Q=(480)(0.96)(212)

Q= 97,690 J

Before we submit an answer, let's check out units. We have our answer in Joules, but we want it it kilojoules, so we'll convert it knowing that:

1000 Joules = 1 kilojoule

97,690J x [tex]\frac{1 kJ}{1000J}[/tex] = 97.7kJ

Explanation:

the answer and the working out is shown above.