Which of the following indicates an endothermic reaction? I will mark as brainliest if correct.​

Answer:

More people means more demand for oil, gas, coal and other fuels mined or drilled from below the Earth's surface that, when burned, spew enough carbon dioxide (CO2) into the atmosphere to trap warm air inside like a greenhouse

Explanation:

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Answer:

pH = 2.38

Explanation:

Recall that HCl is a strong acid and hence dissociates completely into H⁺ and Cl⁻ ions. Thus, the solution's H⁺ concentration is equivalent to the acid concentration. That is, [H⁺] = 4.2 × 10⁻³ M.

Therefore, the pH of the solution is:

[tex]\displaystyle \begin{aligned}\text{pH} & = -\log[\text{H}^+] \\ \\ & = -\log (4.2\times 10^{-3}) \\ \\ & = 2.38\end{aligned}[/tex]

Answer:

HCl + H[tex]\\ 2[/tex]O —> Cl- + H[tex]\\ 3[/tex]O+

pH = -log [H[tex]\\ 3[/tex]O+] = -log [4.2 x 10^-3] = 2.38

—

We assume that hydrochloric acid will undergo complete dissociation in water to give stoichiometric H3O+ ion, according to the given reaction.

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Have a nice day!!

Answer:

alkenes and cyclic compounds

Individual marble:

Answer:

Individual Marble

Use the formula 4/3_?_ R^3, to solve for the volume. Here, R is the radius, or half of D. ^3 means the radius is cubed.

Explanation:

Answer:

of Equilibrium Constant

Consider the chemical system:

2 NO(g)

N₂(g) + O₂ (g)

K = 2.1 x 1030

How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?

Select one:

O a. They are much lower

O b. They are much higher

O c.

They are about the same order of magnitude

O d. They have to be exactly equal

e.

You can't tell from the information

Explanation:

of Equilibrium Constant

Consider the chemical system:

2 NO(g)

N₂(g) + O₂ (g)

K = 2.1 x 1030

How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?

Select one:

O a. They are much lower

O b. They are much higher

O c.

They are about the same order of magnitude

O d. They have to be exactly equal

e.

You can't tell from the information

Answer:

super saturation takes place.

The answer to the correct number of significant figures is 0.171.

The numbers 1 to 9 will always be significant figures. Leading zeros of a number are not significant figures. Zeros to the right of a number are significant figures.

In this case we have:

[tex]0.97584/5.68 = 0.171[/tex]

So you only need the three numbers after the dot.

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Population density is the number of specific organisms living in a particular area. The tectonic plate movements in the Ring of Fire area can cause volcanic eruptions and earthquakes.

Tectonic plates are the parts of the crust and the mantle of the earth layer that is also called the lithosphere plate. They are not stationary and have slight movements on the mantle which comprises the hot lava.

The movement of these tectonic plates in the area of the Ring of fire causes the eruption of the lava and disrupts the crust causing an earthquake. This consequence affects the life habiting them.

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Answer:

im pretty sure because the plates move which causes these natural disasters

Explanation:

Answer:

lithium lithium (or 2lithium) + oxygen ->

Explanation:

Your welcome

Answer:

100 degree is the answer of given statement

The maximum amount, in grams, of Fe that would be produced during the experiment, will be 280 grams

From the equation of the reaction:

[tex]Fe_2O_3 + 2Al -- > 2Fe + Al_2O_3[/tex]

The mole ratio of [tex]Fe_2O_3[/tex] to Al is 1:2.

But 3 moles and 5 moles of reactants respectively started the reaction. Thus, Al is limited in availability and will determine the amount of products that will be produced.

The mole ratio of Al and Fe is 1:1, therefore, a maximum of 5 moles of Fe will be produced from the reaction.

5 moles Fe = 5 x 56 = 280 grams

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The relationship between the enthalpy (ΔH) and entropy (ΔS) of a

reaction that is spontaneous at higher temperatures but not at lower

temperatures is +ΔH, - Δs.

The relationship between enthalpy (ΔH) and entropy (ΔS) is given by Gibs free energy.

ΔG = ΔH - TΔs

When ΔH < 0 and Δs < 0, ΔG = -ve  (-ΔH, - Δs) (for lower temperature)

Also, when ΔH < 0 and  Δs = +, ΔG = -ve (-ΔH, +Δs)  (for all temperature)

When ΔH > 0 and Δs < 0, ΔG = -ve  (+ΔH, - Δs) (for higher temperature)

Thus, the relationship between the enthalpy (ΔH) and entropy (ΔS) of a

reaction that is spontaneous at higher temperatures but not at lower

temperatures is +ΔH, - Δs.

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Apply Boyles law

Remember

If Volume is four times increased pressure is 4 times decreased

Answer:

Cation and anion.

Cation is a positive ion.

Anion is negative ion.

E.g.: NaCl, CaF2, KBr

Mass of H2CO3 = 1.05g

Givens: NaHCO3 = 3.24

Na2CO3 = 2.19

Mass of H2CO3 = mass of NaHCO3 - mass of Na2CO3

Mass of H2CO3 = 3.24g - 2.19g

Mass of H2CO3 = 1.05g

The number of protons and the number of neutrons combine to determine the mass number of an element. Mass number = proton + neutron. If you want to calculate the number of neutrons an atom has, you can simply subtract the number of protons or atomic numbers from the mass number.

Divide the mass of a substance in grams by the molecular weight. This will give you the number of moles of the substance in a particular mass. For 12 g of water, (25 g) / (18.015 g / mol) = 0.666 mol.

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A Plate Boundaries and Movement Lab Report is a report that shows the records of all the data relating to the movement of Plate Boundaries and their movements.

A tectonic plate is also described or referred to as a Lithosperic Plate. In Geography, it is described as a slab of rock that is not shaped regularly.

In most cases, it comprises continental and oceanic lithosphere.

Plate Boundaries and their movement are largely linked to volcanic activities and earthquakes. This means that they can be used to predict when any of the above-mentioned events may happen.

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Answer:

Fluorine 1s2 2s2 2p5

Explanation:

it is likely to receive 1 electron

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In the periodic table, this element belongs to the 17th group. As a result, the element has a tendency to gain one electron during bond formation in order to achieve octet.

electronic configuration is:

[tex]1s^22s^22p^5[/tex]

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The name of the compound is 2-methyl-3-ethylheptanoic acid.

Looking at the structure, the longest carbon chain is 7. Meaning that the compound is a heptanoic acid.

There are 2 branches. The first one has a single carbon (methyl) while the second one has 2 carbons (ethyl).

The methyl is located on the second carbon (2-methyl) while the ethyl is located on the third carbon (3-ethyl) on the main chain.

Thus, the name of the compound would be 2-methyl-3-ethylheptanoic acid.

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Answer:its c 3-ehtyl

Explanation:

Answer:

= 0.4 M

Explanation:

data:

moles = 0.060 moles

volume = 1500 ml

             = 1500 / 1000

              = 1.5 dm^3

solution;

      molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]

                    = 0.060 / 1.5

         molarity  = 0.4 M

Answer:

AZ₂

Explanation:

The formed compound will not contain Q because mass percentages, %A and %B, form 100% of the compound.

Steps

Solving

Answer:

Face value. Corporate bonds normally have a par value of $1,000, but this amount can be much greater for government bonds.

Interest. ...

Coupon or interest rate. ...

Maturity. ...

Issuers. ...

Rating agencies. ...

Tools and tips.

The name of the carboxylic acid would be 2-methyl-3-ethylheptanoic acid.

Carboxylic acids are named based on the longest carbon chain and the counting starts from the carboxylic acid's functional group.

Thus, in this case, the compound would be a heptanoic acid because the longest chain towards the functional group has 7 carbons.

This means 2 branches exist in the compound. The first one has a single carbon while the second one has 2 carbon atoms. This means they are methyl and ethyl groups respectively.

The branches are located on the second and third carbon on the main chain. Thus the compound's name is 2-methyl-3-ethylheptanoic Acid.

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Answer:

Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol

Explanation:

First, collect the individual molar masses of each element. These values are found on the periodic table under each respective element.

Chromium (Cr): 51.996 g/mol

Phosphorus (P): 30.974 g/mol

Oxygen (O): 15.999 g/mol

The quantity of each element is determined by the subscript next to it. If their is a subscript directly to the right of a set of parentheses, multiply each element within the parentheses by the subscript.

Chromium (Cr): 4

Phosphorus (P): 1 x 3 = 3

Oxygen (O): 4 x 3 = 12

Finally, the total molar mass of the compound is the collective molar masses of each element times the quantity of each element.

Molar Mass (Cr₄(PO₄)₃): 4(51.996 g/mol) + 3(30.974 g/mol) + 12(15.999 g/mol)

Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol

Answer:

well it is because of mainly what we call reaction the petrol are highly reactive with the flames

Answer:

You can get to the answer in two steps:

calculate: 3.40⋅1022 atoms = x mol ?

using Avogadro's constant.

calculate: x mol = ? grams,

using the atomic mass of Helium.

Step 1

Avogadro's constant says that 1 mole of any atom contains 6.022⋅1023 atoms. In this case you have 3.40⋅1022 atoms:

3.40⋅1022atoms6.022⋅1023atomsmol = 5.65⋅10−2mol

Step 2

The atomic mass of helium (He) will give you the weight of one mole of this molecule: 1 mol = 4.00 gram:

4.00gmol⋅5.65⋅10−2mol = 0.226g

So the 3.40⋅1022 helium atoms weigh 0.226 gram.