HELPPPPP PLEASE!!!

What heats the mantle?

A.radiation in the crust heats the mantle through convection

B.convection in the crust heats the mantle through conduction

C.radiation in the core heats the mantle through conduction

D.convection in the core heats the mantle through conduction

Answer:

1. Yes, no, no

2. No, yes, no

3. Yes, Yes, No

Explanation:

Three states of matter exist – solid, liquid, and gas. Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.

Answer:

Explanation:

Ok so for the first row I believe is Yes, No, No

Second row  No, yes, No

last row i dont know

I hope this helped

(p.s I have't done this in a couple of months so it might be wrong and i am so sorry if it is.)

Answer:what’s the question?

Explanation:

answer:

612.5

Explanation:

from the equation, no. of mole of iron oxide is obtaibed from mass over molar mass equals to 5.5 moles, taking mole ratio as 1:2 to get moles of iron as 10.94 moles, then the mass is obtained by moles of iron times molar mass

Answer:

Maybe (D)

......,.,......

The convergent plate boundary is the movement of the lithospheric plates. The North American plate boundary and the Aleutian trench is the site of convergent plate boundary. Thus, options B and D are correct.

A convergent plate boundary is the type of plate boundary and is marked by the region where the tectonic plates of the lithospheric region collide with each other due to the process of subduction.

The convergent plate boundary can be seen between ocean‐ocean, continent‐continent, and ocean‐continent. The convergent boundary is seen in the Aleutian trench and the North American Plate that is under the subduction process. On the other hand, the Mid-Atlantic Ridge and the Atlantic-Indian ridge has divergent or constructive plate boundary.

Therefore, options B and D. North American plate boundary and the Aleutian trench is the site of convergent plate boundary.

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Answer:

100 m/hr S

Explanation:

Use formula Velocity = displacement/time

V=?        d=300         t=3

V=300/3

V=100

Hope this helps!! :D

Sofia's average velocity is  100 m/hrs using the velocity formula which is displacement/time.

Speed of an object refers to the change in position of that object concerning time. Velocity on the other hand is nothing, but the speed defined concerning the direction in which an object travels.

Average velocity according to the definition is the ratio of the displacement from point a to point b of an object to the time it takes to make that displacement from point a to point b. It may be noted that we use the term movement instead of distance to emphasise the direction. 

Velocity is a vector quantity and average velocity can be found by dividing displacement by time. It is found out as, 300/3=100 m/hrs.

Thus, Sofia's average velocity is  100 m/hrs using the velocity formula which is displacement/time.

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Answer:

Carbon monoxide is a very important industrial compound. In the form of producer gas or water gas.

hope ths help and if you want more information go to this website: science.jrank.org

Hello. Your question is incomplete and it makes it very difficult for it to be answered exactly, but I will try to help you in the best possible way.

An efficient way to separate and isolate cooking oil after extraction is through the separating funnel, which allows other liquids, or oil-insoluble substances to be removed efficiently, allowing only the oil to be removed.

Answer:

b

Explanation:

Answer:

the median is 14 the range is 15 the mode is 14 and the mean is 12.7

Explanation:

for the median you put all numbers is order but least to greatest and figure out the middle number for range you take the smallest and the biggest number and subtract them for mode you use the most repeated number and for the mean you add all the numbers and divide by the total of numbers I hope this helped

Answer:

3.16mL of glacial acetic acid must be added

Explanation:

The mixture of acetic acid with sodium acetate produce a buffer. The buffer follows the H-H equation:

pH = pKa + log [A⁻] / [HA]

Where pH is the pH of the buffer: 5.0

pKa is pKa of the buffer = 4.74

[A⁻] could be taken as moles of acetate ion = 0.500L * (0.20mol/L) = 0.100mol

And [HA] are moles of acetic acid.

Replacing:

5.0 = 4.74 + log [0.100mol] / [HA]

0.26 = log [0.100mol] / [HA]

1.8197 = [0.100mol] / [HA]

[HA] = 0.100mol / 1.8197

[HA] = 0.05495 moles of acetic acid

As the glacial acetic acid is 17.4M, the volume we must add to prepare the buffer is:

0.05495 mol * (1L / 17.4mol) = 3.16x10⁻³L =

Answer:

5.0 g

Explanation:

Step 1: Write the balanced equation

FeCl₂ + 2 Na⁺ = 2 NaCl + Fe²⁺

Step 2: Calculate the moles corresponding to 5.4 g of FeCl₂

The molar mass of FeCl₂ is 126.75 g/mol.

5.4 g × 1 mol/126.75 g = 0.043 mol

Step 3: Calculate the moles of NaCl produced from 0.043 moles of FeCl₂

The molar ratio of FeCl₂ to NaCl is 1:2. The moles of NaCl produced are 2/1 × 0.043 mol = 0.086 mol.

Step 4: Calculate the mass corresponding to 0.086 moles of NaCl

The molar mass of NaCl is 58.44 g/mol.

0.086 mol × 58.44 g/mol = 5.0 g

Answer:

See explanation

Explanation:

Dehydration of an alcohol by E1 mechanism occurs in two steps. The first step is the is the protonation of the -OH group in the alcohol followed by the elimination of water, a good leaving group.

In the case of  2,3‑dimethylpentan‑3‑ol, the carbocation formed undergoes rearrangement followed by loss of a hydrogen atom. This now yields the product as shown in the image attached.

Note that, the Zaitsev's product is the most substituted product and is most stable hence it is the most favored product.

Answer:

the normality of the given solution is 0.0755 N

Explanation:

The computation of the normality of the given solution is shown below:

Here we have to realize the two sodiums ions per carbonate ion i.e.

N = 0.321g Na_2CO_3 × (1mol ÷ 105.99g)×(2eq ÷ 1mol)

= 0.1886eq ÷ 0.2500L

= 0.0755 N

Hence, the normality of the given solution is 0.0755 N

Answer:

e = Mc hammer.

Explanation:

The Sea and the ocean are just different terms that mean same thing

Answer:

Explanation:

In terms of geography, seas are smaller than oceans and are usually located where the land and ocean meet. Typically, seas are partially enclosed by land. Seas are found on the margins of the ocean and are partially enclosed by land. ... Seas are smaller than oceans and are usually located where the land and ocean meet.

Answer:

(Kc)^2

Explanation:

For this reaction 4 A⇌ 2B Kc is (Kc)∧².

The equilibrium constant is the value of the reaction quotient that is calculated from the expression for chemical equilibrium. A thermodynamic equilibrium constant, denoted by , is defined to be the value of the reaction quotient Qt when forward and reverse reactions occur at the same rate. At chemical equilibrium, the chemical composition of the mixture does not change with time and the Gibbs free energy change. Stability constants, formation constants, binding constants, association constants and dissociation constants are all types of equilibrium constants.

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Answer:

2

Explanation:

1) the formula of the energy is:

E=cm*Δt, where E - the value of the energy (5480 J.), c - the specific heat capacity (4200 J/(kg*C)), Δt - the difference between initial temperature and the final one (it is unknown);

2) if to perform the substitution of the values 'E', 'm' and 'c' into the formula above, then

5480=4200*0.65*Δt;

3) to calculate Δt:

Δt=5480/4200/0.65≈2 (°C).

note: the initial temperature is higher than the final.

Answer:

baking bread

Explanation:

The presence of yeast makes this catabolic. The yeast is breaking down into smaller units

Answer:

Explanation:

the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

the total number of protons and neutrons in a nucleus.

to write the symbol for an isotope, place the atomic number as a subscript and the mass number (protons plus neutrons) as a superscript to the left of the atomic symbol

Answer:

d because ur heating the ice and causing friction

Answer:

I don’t know why you mean by “...as it is shown in the equation” but the molar mass for NaF(sodium fluoride) is below

Explanation:

Answer:

Examples of permineralization

Most dinosaur bones are permineralized. Petrified wood: Permineralization is the first step in petrification.

Answer: you didn’t put any picture of any answers to pick but example of permineralization fossils would be dinosaur remains and wood

Answer: Goldfish. :p

Explanation:

Answer:

KOH is limiting reactant

Explanation:

To solve this question, we need to convert the mass of each reactant to moles. Then, using the balanced reaction, we can find the limiting reactant:

Moles S -Molar mass: 32g/mol-:

14g S * (1mol / 32g) = 0.44mol

Moles O₂ -Molar mass: 32g/mol-:

24g O₂ * (1mol / 32g) = 0.75mol

Moles KOH -Molar mass: 56g/mol-:

28g KOH * (1mol / 56g) = 0.5mol

For a complete reaction of the KOH are required:

0.5mol KOH * (2mol S / 4mol KOH) = 0.25mol S

0.5mol KOH * (3mol O₂ / 4mol KOH) = 0.38mol O₂

As there are 0.44 moles of S and 0.38moles of oxygen,

Answer:

2928kg of ore are required.

2585kg of the 80% H₂SO₄ solution are required.

Explanation:

To solve this question we need first to find the moles of titanium in 1000kg of TiO₂. Keeping in mind the 89% of descomposition we can find the mass of the ore and the mass of the 80% sulfuric acid required:

Moles TiO₂ -Molar mass: 79.866g/mol-:

1x10⁶g * (1mol / 79.866g) = 12521 moles Titanium

In mass -Molar mass Ti: 47.867g/mol-:

12521 moles Titanium * (47.867g / mol) = 599341.4g of Ti.

As the ore contains 24.3% of Ti:

599341.4g of Ti = 599.34kg Ti * (100 / 24.3) = 2606kg ore

As the descomposition is just of 89%:

2606kg ore * (100 / 89) =

Mass 80% sulfuric acid:

12521 moles Titanium = 12521 moles H₂SO₄ * (100/89) = 14068.5 moles of H₂SO₄ are required.

In an excess of 50% =

14068.5 moles of H₂SO₄ are required * 1.5 = 21102.8 moles of H₂SO₄.

The mass is:

21102.8 moles of H₂SO₄ * (98g / mol) = 2068075g = 2068kg of sulfuric acid

That is in the 80%:

2068kg of sulfuric acid * (100/ 80) =

2771.53 kg of titanium ore and 2584.63 kg of 80% H₂SO₄ are required to produce 1000 kg of pure TiO2.

The moles of titanium in 1000 kg of TiO₂ is first determined:

mass of TiO₂ = 1000 kg = 1 * 10⁶g

moles of TiO₂ = 1 * 10⁶g/79.88 g/mol

moles of TiO₂ = 12518.77 moles

1 mole of TiO₂ produces 1 mole of titanium

12518.77 moles TiO₂ produces 12518.77 moles of titanium

mass of titanium = number of moles * molar mass

mass of titanium = 12518.77 moles * 47.88 g/mol

mass of titanium = 599398.70 g

Since the percentage mass of titanium in the ore is 24.3%

mass of ore  = 599399.18 g * 100/24.3

mass of ore = 2466661.31 g

mass of ore in kg = 2466.66 kg

Since only 89% of ore decomposed, mass of ore required = 2466.66 kg *100/89

mass of ore required = 2771.52

Mass 80% sulfuric acid required is calculated as follows:

Therefore, 12521 moles Titanium = 12521 moles H₂SO₄

Since only 89% of the ore decomposes;

moles of H₂SO₄ required = 12518.77 moles * 100/89

moles of H₂SO₄ required = 14066.03 moles

moles of H₂SO₄ supplied = 14066.03 moles * 150/100

moles of H₂SO₄ supplied = 21099. 04 moles

mass of H₂SO₄ supplied = 21099. 04 moles * 98 g/mol

mass of H₂SO₄ supplied = 2067702 g

mass of 80% H₂SO₄ required = 2067702 g * 100/80

mass of 80% H₂SO₄ required = 2584627.5 g

mass of 80% H₂SO₄ required in kg = 2584.63 kg

Therefore, 2771.53 kg of ore and 2584.63 kg of 80% H₂SO₄ are required to produce 1000 kg of pure TiO2.

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Answer:

0.966g of sodium benzoate are in the original sample

Explanation:

The sodium benzoate, B⁻, reacts with HCl as follows:

B⁻ + HCl → BH + Cl⁻

Where 1 mole of benzoate reacts per mole of HCl

The HCl is added in excess. We can find the HCl that reacts with sodium benzoate using the NaOH that reacts with HCl.

When 1 drop change the pH in 1,1 units, this point is the equivalence point. Thus, moles in excess of HCl = Moles of NaOH added are:

0.04650L * (0.393mol / L) = 0.0183 moles NaOH = Moles HCl in excess

Moles HCl added:

0.0500L * (0.500mol/L) = 0.0250 moles HCl added

Moles HCl that react = Moles Sodium benzoate:

0.0250 moles HCl - 0.0183 moles HCl = 0.0067 moles HCl = Moles Sodium benzoate

Mass Sodium benzoate -Molar mass: 144.11g/mol-:

0.0067 moles Sodium benzoate * (144.11g/mol) =

Answer:Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

Explanation: