Which of these describes an exothermic reaction? Please help, today is the last day to submit anything.

Answer:

Pb[lead] [Xe]4f^145d^106s^26p^2

U[uranium] 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4e^14 5d^10 6p^6

7s^2 5f^4

This notation can be written in core notation or noble gas notation by replacing the

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4e^14 5d^10 6p^6

7s^2 5f^4

with the noble gas [Rn].

[Rn]7s25f4

N[nitrogen] The full electron configuration for nitrogen is 1s^2 2s^2 2p^3.

Ti[titanium] Ti2+:[Ar]3d^2

Ti:1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 4s^2

1s^2 2s^2 2p^6 3s^2 3p^5 = 17 electrons

(1) electron gain will result to a

negative charge (−), and

(2) electron loss will result to a positive charge (+),

1s^2 2s^2 2p^6 3s^2 3p^6 = 18 electrons

Hg[mercury] You should then find its atomic number is 80. It has a Xe core, so in shorthand notation, you can include [Xe]instead of

1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 5p^6,

for 54 electrons. For the 6th row of the periodic table, we introduce the 4f orbitals, and proceed to atoms having occupied 5d orbitals. We, as usual, have the ns orbitals, and n=? for the 6th period?

Mercury has a regular electron configuration. It becomes:

[Xe]4f145d106s2

Explanation:

socratic.org helped me! I'm really sorry if this is wrong!

Answer:

Formula Weight of gas sample = 20.1 g/mole => Neon (Ne)

Explanation:

Use Ideal Gas Law formula to determine formula weight and compare to formula weights of answer choices.

PV = nRT = (mass/fwt)RT => fwt = (mass/Volume)RT = Density x R x T

Density = 0.900 grams/L

R = 0.08206 L·atm/mole·K

T = 0.00°C = 273Kfwt = (0.900g/L)(0.08206L·atm/mole·K )(273K)

= 20.1 g/mol => Neon (Ne)

Answer:

I believe tha answer is travels at the same speed of light

Explanation:

hope this helps

Answer:

Magnesium

Explanation:

It's an alkali metal and is in the third period on the period table. I'm sure

The alkaline earth metal found in period 3 of the periodic table is magnesium.The lightest structural metal is magnesium (Mg), an alkaline-earth metal from Group 2 (IIa) of the periodic table.

I am an alkali metal located in the third period of the periodic table. Who am I?

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your anwser would be 342 gmol  Please mark branliest

Just get out that Periodic Table of the Elements, find the atomic masses for each atom, and add them up!

Carbon = 12

Hydrogen = 1

Oxygen = 16

C=12×12=144

H=1×22=22

O=16×11=176

Sucrose =144+22+176=342gmol

Answer:

5.850 kJ (of heat energy)

Explanation:

What we need:

[] The mass of the material = m = 32.5g  

[] The temperature change that occurs = ΔT = 43

() 75 - 34 = 43  

[] The specific heat capacity of the material = c

() This is the amount of heat required to raise 1 gram of that substance by 1°C

() For water, this is 4.186Jg°C

The equation to use:

Q = m * c * ΔT

Q = 32.5 * 4.186 * 43

Q = 5849.935 J

Q = 5.850 kJ

Have a nice day!

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

Answer:

[tex]\boxed {\boxed {\sf 5569.85 \ Joules}}[/tex]

Explanation:

We are asked to find how much energy is required to heat a sample of water.

We will use the following equation:

[tex]q= mc \Delta T[/tex]

The mass of the water is 32.5 grams. The specific heat capacity of water is 4.18 Joules per gram degree Celsius.

The change in temperature is the difference between the final temperature and the initial temperature. The water's temperature is raised from 34 degrees Celsius to 75 degrees Celsius.

Now we know all three variables:

Substitute the values into the formula.

[tex]q= (32.5 \ g)(4.18 \ J/g \textdegree C)(41 \ \textdegree C)[/tex]

Multiply the first 2 numbers together. The units of grams cancel.

[tex]q= 135.85 \ \ J/ \textdegree C(41 \ \textdegree C)[/tex]

Multiply again. This time, the units of degrees Celsius cancel.

[tex]q= 5569.85 \ J[/tex]

5,569.85 Joules of energy are required.

Answer:

ethene

Explanation:

as in ethene there is presence of double carbon which is commonly known as alkene group

Answer:

- The Valence/Bonding Electrons (whatever name you address them as) in Flourine are closer to the nucleus than the Valence/Bonding Electrons are in an atom of Bromine.

Explanation:

Hopefully this was helpful!

Answer:

A. evaporation

Explanation:

Answer:

This process is called (A) evaporation.

I hope this helped at all.

Answer:False. The Bohr model correctly predicts energy levels of hydrogen and hydrogen-like atoms.

Explanation:

Answer:

If the initial hypothesis is not supported, you can go back to the drawing board and hypothesize a new answer to the question and a new way to test it. ... Either way, the process of experimentation often leads to whole new questions to explore.

Scientific inquiry uses evidence from observations and investigations to create logical explanations to answer questions related to science. Scientific inquiry is different from the scientific method. ... Scientific inquiry helps you think outside the box to understand the natural world.

Unlike social scientists, behavioral scientists collect empirical data and use experimental methods, including testing, controls and manipulated settings.

Explanation:

Answer:

You can block me I don't care ;-; Ive actually been wanting to be blocked because I don't want my account on brainly anymore but they cant understand that I used my school email for this account and my school email doesnt reseave emails not from the school and I cant change the email to a different one so I cant reset my password so I cant delete my account..

Explanation:

Answer:

She should use the crystalization technique

Explanation:

First, the copper sulfate solution should be filtered to clear any impurities.

By heating the solution of copper sulfate on a china dish, the excess water in the solution evaporates and leaves behind a saturated solution of copper sulfate.

Upon cooling this saturated copper sulfate solution, crystals of solid copper sulfate will be formed on the china dish.

In solid form, copper sulfate appears in triclinic-shaped crystals.

The mass of ferric nitrate, Fe(NO₃)₃ produced from the reaction given the data is 5792.44 g

2Fe + 6HNO₃ –> 2Fe(NO₃)₃ + 3H₂

Molar mass of Fe = 56 g/mole

Mass of Fe from the balanced equation = 2 × 56 = 112 g

Molar mass of Fe(NO₃)₃ = 56 + 3[14 + (16×3)] = 242 g/mole

Mass of Fe(NO₃)₃ from the balanced equation = 2 × 242 = 484 g

SUMMARY

From the balanced equation above,

112 g of Fe reacted to produce 484 g of Fe(NO₃)₃

From the balanced equation above,

112 g of Fe reacted to produce 484 g of Fe(NO₃)₃

Therefore,

1340.4 g of Fe will react to produce = (1340.4 × 484) / 112 = 5792.44 g of Fe(NO₃)₃

Thus, 5792.44 g of Fe(NO₃)₃ were obtained from the reaction

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Answer:

open burning adds do our global timer adding carbons ,methane etc. to our atmosphere

also open burning is burning of unwanted material in the open air where smoke and toxins fumes are released into the atmosphere directly

Explanation:

i used the amazing internet

Answer:

A. prokaryotic cell

Explanation:

We can easily identify the diagram as prokaryotic cell by the capsule shown. These organisms mostly have capsules.

Answer:

Acid + Base -------> Salt + Water

Explanation:

The reaction between an acid and bases is called a neutralization reaction. The result of the reaction is salt and water. For example, when hydrochloric acid(acid) and sodium hydroxide(base) react they form sodium chloride(salt) and water. Also, heat is evolved.

Example:

HCl + NaOH ----------> NaCl + H2O

HCl is hydrochloric acid.

NaOH is sodium hydroxide which is a base.

NaCl is sodium chloride which is a salt.

H2O is water.

Answer:

6 possible electron can fit into the 2p subshell

Answer:

Answer)   The first box represent the budding type of asexual reproduction . In budding due to the cell divison at the particular place in the organism , new  individual will produced.

Second picture represent the budding in hydra. Budding is also a asexual reproduction.

Third type of asexual reproduction is found in plants  it is vegetative reproduction.

Fourth is Binary fission . This is also a type of asexual reproduction, in which nucleus dicied into two new daughter cell via mitosis.Explanation:

Answer:

Physically, a gene is a segment (or segments) of a chromosome. Functionally, a gene can play many different roles within a cell.

Explanation:

Answer:

option D--Decomposition; oxidation-reduction

Answer: A. Combustion; decomposition

Explanation: I took it on a quiz and got it right!

Answer:

Vanillin consists of molecules. The attraction between particles of silver iodide is stronger than the attraction between particles of vanillin.

The silver iodide a compound used in photography because,

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Answer:

When the concentration of all the reactants increases, more molecules or ions interact to form new compounds, and the rate of reaction increases. When the concentration of a reactant decreases, there are fewer of that molecule or ion present, and the rate of reaction decreases.

Answer:

Negative

Explanation:

The bond and the force present between molecules is called intermolecular force. A hydrogen bond is present between the stearic acid and a water molecule.

Hydrogen bonds are the intermolecular force that forms a dipole-dipole interaction with an electronegative atom in the presence of the lone pair of electrons.

In stearic acid, [tex]\rm C_{18}H_{36}O_{2}[/tex], hydrogen bonding exists between the oxygen and the hydrogen atom of the molecule.

Therefore, a hydrogen bond is present between stearic acid and the water molecule.

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Answer:

One

Explanation:

In a hydrogen atom, the first outer shell only consists of two valence electrons, because it would already have one, the atom only needs one more.

It requires two electrons to completely occupy its outer shell, it frequently forms a single covalent bond with another atom. Because of this configuration, hydrogen can gain access to two electrons and completely occupy its valence shell.

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Answer:

Endoplasmic reticulum

Explanation: