someone help with this will mark brainliest

Answer:

I think the third one

Explanation:

i think

Answer:

electrons that are NOT shared equally

Explanation:

The answer is D. 50 km

Answer:

19 °C

Explanation:

Step 1: Given and required data

Step 2: Calculate the temperature change (ΔT)

We will use the following expression.

Q = c × m × ΔT

ΔT = Q/c × m

ΔT = 300.2 J/(0.790 J/g.°C) × 20 g = 19 °C

Answer:

a)

        Zn(s) + 2 H⁺(aq) ⇒ Zn²⁺(aq) + H₂(g)

#p⁺    30          2              30             2

#e⁻    30          0              28             2

b) 32

c) 30

d) Zn

Explanation:

There is some info missing. I will add the complete question.

Consider the following oxidation/reduction reaction.

         Zn(s) + 2 H⁺(aq) ⇒ Zn²⁺(aq) + H₂(g)

#p⁺                                                     2

#e⁻                                                     2

a) Fill in the number of protons and electrons for each product and reactant (two boxes have been filled in for you).

b) Verify that the number of protons on the left side of the chemical equation is equal to the number of protons of the right side. Show your work.

c) Verify that the number of electrons on the left side of the chemical equation is equal to the number of electrons of the right side. Show your work.

d) Which substance is being oxidized?

a) The atomic number of Zn is 30 so it will have 30 protons. Since it ts neutral, it will also have 30 electrons. Zn²⁺ will also have 30 protons but it lost 2 electrons, so it has 28 electrons. The atomic number of H⁺ is 1, so each H atom will have 1 proton (2 in total). But since H has 1 electron, and H⁺ lost 1 electron, H⁺ will have 0 electrons. The complete chart is:

        Zn(s) + 2 H⁺(aq) ⇒ Zn²⁺(aq) + H₂(g)

#p⁺    30          2              30             2

#e⁻    30          0              28             2

b) The total number of protons on the left side is: 30 + 2 = 32.

The total number of protons on the right side is: 30 + 2 = 32.

c) The total number of electrons on the left side is: 30 + 0 = 30.

The total number of electrons on the right side is: 28 + 2 = 30.

d) Zn(s) is oxidized because it loses electrons (from 30 to 28) and its number increases.

Answer:

[tex]T_1=-91.18\°C[/tex]

Explanation:

Hello there!

In this case, given the T-V variation, we understand it is possible to apply the Charles' law as shown below:

[tex]\frac{T_1}{V_1}= \frac{T_2}{V_2}[/tex]

Thus, since we are interested in the initial temperature, we can solve for T1, plug in the volumes and use T2 in kelvins:

[tex]T_1= \frac{T_2V_1}{V_2}\\\\T_1= \frac{(18.00+273.15)K(1.75L)}{(2.80L)}\\\\T_1=182K-273.15\\\\T_1=-91.18\°C[/tex]

Best regards!

Answer:

24.9 L Ar

General Formulas and Concepts:

Atomic Structure

Aqueous Solutions

Stoichiometry

Explanation:

Step 1: Define

[Given] 40.0 g Ar

[Solve] L Ar

Step 2: Identify Conversions

[PT] Molar Mass of Ar - 39.95 g/mol

[STP] 22.4 L = 1 mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

24.9235 L Ar ≈ 24.9 L Ar

Answer:How can you tell how much gas is in these containers?

Small gas tanks are often used to supply gases for chemistry reactions.  A gas gauge will give some information about how much is in the tank, but quantitative estimates are needed so the reaction will be able to proceed to completion.  Knowing how to calculate needed parameters for gases is very helpful to avoid running out too early.

Conversions Between Moles and Gas Volume

Molar volume at STP can be used to convert from moles to gas volume and from gas volume to moles.  The equality of 1 mole = 22.4 L is the basis for the conversion factor.

Sample Problem One: Converting Gas Volume to Moles

Many metals react with acids to produce hydrogen gas.  A certain reaction produces 86.5 L of hydrogen gas at STP.  How many moles of hydrogen were produced?

Step 1: List the known quantities and plan the problem.

Known

86.5 L H2

1 mol = 22.4 L

Unknown

moles of H2

Apply a conversion factor to convert from liters to moles.

Step 2: Calculate.

Explanation:

Answer:

Yes.

Explanation:

Yes.

Answer:10-1707

Explanation:

Answer:

526g is the mass of this sample

Explanation:

To solve this question we must, as first, find the molar mass of Al₂(Cr₂O₇)₃ using the periodic table. The molar mass is defined as the mass of this compound per mole. With this value we can find the mass in 0.750 moles as follows:

Molar mass Al₂(Cr₂O₇)₃

2Al = 2*26.98g/mol = 53.96g/mol

6 Cr = 6*51.9961g/mol = 311.9766g/mol

21 O = 21*15.999g/mol = 335.979g/mol

53.96g/mol + 311.9766g/mol + 335.979g/mol

= 701.9156g/mol

The mass of 0.750 moles is:

0.750 moles * (701.9156g / mol) =

Answer: C

Explanation:

he never had evidence in the first place that was nearly enough.

Explanation:

This would be similar to how the poles work in the North and South. Due to their placement, they recieve much more sun light than the rest of the Earth since we rotate horizontally. However, their placement also makes them farther from the sun than the rest of Earth, therefore not receiving as much heat.

Answer:

C. Both processes convert mass into energy.

Answer:

Mitochondria

Explanation:

Answer:

Mitochondria

Explanation:

Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.

Answer:

number. so the option is c

Answer:

atomic number

Explanation:

i just know it

Answer:

B. Ksp = 1.7 × 10¯⁷

Explanation:

Hello there!

In this case, for this solubility equilibrium problem, we first need to set up the chemical reaction describing the dissolution of the involved salt, CuCl:

[tex]CuCl(s)\rightleftharpoons Cu^+(aq)+Cl^-(aq)[/tex]

Next, we write the corresponding equilibrium expression:

[tex]Ksp=[Cu^+][Cl^-][/tex]

Now, we need to calculate the concentrations of copper (I) and chloride ions at equilibrium; thus, given that 0.041 g of this solid is completely dissolved in 1.0 L of solution, we can firstly calculate the moles present in the solution:

[tex]n_{CuCl}=0.041gCuCl*\frac{1molCuCl}{99gCuCl} =4.14x10^-4mol[/tex]

Afterwards, since all the species in the reaction, CuCl, Cu+ and Cl- are in a 1:1:1 mole ratio, we realize that those moles correspond to ions in the solution, so their concentrations are:

[tex][Cu^+]=[Cl^-]=\frac{4.14x10^{-4}mol}{1.0L}= 4.14x10^{-4}M[/tex]

Then, we compute the Ksp by plug this value in the equilibrium expression:

[tex]Ksp=(4.14x10^{-4})(4.14x10^{-4})=1.7x10^{-7}[/tex]

Thus, the answer would be B. Ksp = 1.7 × 10¯⁷.

Regards!

Answer:

Decay-the breakdown of dead plants..

Earth- thermal energy comes from deep inside...

Fires- these consume feul...

Explanation:

Answer:

Fires - These consume fuel and covert chemical energy stored in that fuel into thermal, light and sound energy

Decay - The breakdown of dead plants and animals produces thermal energy

Earth - Thermal energy comes from deep inside and is called geothermal energy

Explanation:

Fires, when you burn wood, you convert chemical energy from the wood into thermal (warmth from the fire), light (glow from the fire), sound (crackling sound of wood burning)

Decay - I can't explain that one to you but there are power plants that use decomposition to produce energy

Earth - Beneath the crust there is the mantle, which consists of molten rock which produces a lot of thermal energy. This can be seen in geysers, where the molten rock heats water and hot water can burst out of the surface. Applies to hot springs too

Answer:either 20.38 or 21.38

Explanation:

i clicked on 10.38 and it was wrong, i also clicked on 22.38 and it was wrong lol

Answer: 21.38 mL

Explanation: i just answered it on ck-12

Answer:

The right approach is "50 g/l".

Explanation:

The given values are:

Mass or solute or precipitation,

= 0.15 kg

on converting it into "g", we get

= [tex]0.15 \ kg\times \frac{1000 \ g}{1 \ kg}[/tex]

= [tex]150 \ g[/tex]

Volume of solution,

=  3.00 L

Now,

The solubility of X will be:

=  [tex]\frac{Mass \ of \ X}{Volume \ of \ solution}[/tex]

On substituting the values, we get

=  [tex]\frac{150}{3}[/tex]

=  [tex]50 \ g /l[/tex]

Answer:0.868

Explanation:

Answer: 87950.1 Pascals

The oceans absorb the most sunlight from the options that we have here.

Seventy-one percent or more of the surface of the Earth is covered by the oceans. The result is that they get a lot of sunshine. The upper layers of the ocean absorb a large amount of the incoming solar energy, which enters the ocean waters.

Solar radiation is efficiently absorbed by water, especially in the visible light spectrum. The ocean heats the water as a result of absorbing sunshine. The oceans' ability to absorb solar energy is vital for driving a variety of marine phenomena, including currents, circulation patterns, and temperature distribution, as well as managing Earth's climate.

Learn more about earth:https://brainly.com/question/12041467

#SPJ1

Answer:

The answer is A. Oceans.

Explanation:

I did the test.

Answer:

how many liters of 0.150 m hcl would be required to react completely with 8.00 grams of magnesium hydroxide

Explanation:

please give me brainlist and follow

Answer:

C: Plants mostly need air, water and sunlight to grow

Explanation:

Answer:

I will have the maths book

Answer:98

Explanation:

the answer is gold cause oil wood and glass are electrical insulators

Answer:

The balance reaction is

2Pb(NO3)2 ----》4NO2+2PbO+O2

hence the value of a,b,c,d are 2,4,2,1 respectively!

200.063

Hope this helps :T