Which of the following are excited in ultraviolet photoelectron spectroscopy?
A. Core electrons
B. Nonvalence electrons
C. X-rays
D. Valence electrons

Answer:

0.15atm

Explanation:

Given parameters:

Mass of dry ice = 1.28g

Volume of chamber  = 5L

Temperature  = 35.1°C = 35.1 + 273  = 308.1K

Unknown:

Pressure in the chamber  = ?

Solution:

As we assume ideality for the gases in the cylinder, we use the equation below to solve the problem;

             PV  = nRT

P is the pressure

V  is the volume

n is the number of moles

R is the gas constant  = 0.082atmdm³mol⁻¹k⁻¹

T is the temperature

 Let us find the number of moles;

       Molar mass of CO₂  = 12 + 2(16) = 44g/mol

  Number of moles of  CO₂ = [tex]\frac{mass}{molar mass}[/tex]

  Number of moles of CO₂  = [tex]\frac{1.28}{44}[/tex]   = 0.03moles

 So;

Input the parameters and solve;

        P x 5  = 0.03 x 0.082 x 308.1

         5P  = 0.73

           P = [tex]\frac{0.73}{5}[/tex]   = 0.15atm

Answer:

Measure of uncertainty thousands place or .01 mL

Yes it would be proper.

Explanation:

measure of uncertainty is when you as the user have to guess, since the pipette has marks every 0.1 ml then you can guess that the liquid is in between the marks or maybe closer to one mark then the other.

Answer:

Density

Explanation:

Density of a substance is the mass per unit volume of the substance.

Mass is the amount of particles contained in a matter

Volume is the space occupied by the substance;

 To find density, we simply use;

          Density  = [tex]\frac{mass}{volume}[/tex]  

 So;

 Mass  = Density x Volume

   From;

            M = D x V

M is the mass

D is the is the density

V is the volume

Answer:

Melting: solid liquid, Freezing: liquid to solid, Evaporation: liquid to gas.

Explanation:

mark me the brainliest

Answer:

work done

Explanation:

i think

work done

this is answer

Answer:

ok

Explanation:

Answer:

D

Explanation:

the correct answer is d

Answer:

d

Explanation:

Its just seem like NaCl structure

Answer:

a. Ca(s) + 2H⁺ → Ca²⁺ + H₂(g)

b. 0.0100 moles Ca; 0.0140 moles HCl.

c. HCl is limiting reactant.

d. 0.0030 moles of Ca

Explanation:

a. In water, HCl dissociates in H⁺ and Cl⁻ and CaCl₂ in Ca²⁺ and 2 Cl⁻. The ionic equation is:

Ca(s) + 2H⁺ + 2Cl⁻ → Ca²⁺ + 2Cl⁻ + H₂(g)

b. Moles Ca -Molar mass 40.1g/mol-:

0.401g * (1mol / 40.1g) = 0.0100 moles Ca

Moles HCl:

0.350L * (0.0400mol / L) = 0.0140 moles HCl

c. In the reaction, 1 mole of Calcium reacts with 2 moles of HCl.

For a complete reaction of 0.0100 moles of Calcium there are necessaries:

0.0100mol Ca * (2 mol HCl / 1 mol Ca) = 0.0200 moles HCl

As there are just 0.0140 moles of HCl,

HCl is limiting reactant

d. For a complete reaction of 0.0140 moles of HCl, the moles of Ca that react are:

0.0140 moles HCl * (1 mol Ca / 2 mol HCl) = 0.0070 moles Ca

That means will remain:

0.0100 moles - 0.0070 moles:

0.0030 moles of Ca

Answer:

1336.4N

Explanation:

Given parameters:

Mass of the sumo wrestler  = 330pounds

Unknown:

Amount of force the earth exerts on the wrestler  = ?

Solution:

The force the earth exerts on the wrestler is the weight of the man;

  Weight  = mg

where;

 m is the mass

 g is the acceleration due to gravity

   Now,

 let us convert from pounds to kg;

          2.2pounds  = 1kg

         300 pounds  = [tex]\frac{300}{2.2}[/tex]   = 136.4kg

Weight  = 136.4kg x 9.8m/s²  = 1336.4N

Answer:

3 Cu²⁺(aq) + 2 PO₄³⁻(aq) ⇒ Cu₃(PO₄)₂(s)

Explanation:

Let's consider the molecular equation between aqueous copper(II) chloride and aqueous sodium phosphate.

3 CuCl₂(aq) + 2 Na₃PO₄(aq) ⇒ 6 NaCl(aq) + Cu₃(PO₄)₂(s)

The complete ionic equation includes all the ions and insoluble species.

3 Cu²⁺(aq) + 6 Cl⁻(aq) + 6 Na⁺(aq) + 2 PO₄³⁻(aq) ⇒ 6 Na⁺(aq) + 6 Cl⁻(aq) + Cu₃(PO₄)₂(s)

The net ionic equation includes only the ions that participate in the reaction (not spectator ions) and insoluble species.

3 Cu²⁺(aq) + 2 PO₄³⁻(aq) ⇒ Cu₃(PO₄)₂(s)

Answer:

1. melting

2. freezing

5. condensation

6. evaporation

answer is both physical and chemical changes

Answer:

class i believe

Explanation:

The information that the reduction potentials of two elements give about a redox reaction between those elements is which element will be oxidized and which will be reduced. The correct option is A.

Redox reactions include a change in the oxidation state of the substrate. Loss of electrons or a rise in an element's oxidation state is considered to be oxidation.

Gaining electrons or lowering an object's or its atoms' oxidation state are both considered reductions. A chemical reaction known as an oxidation-reduction (redox) reaction includes the exchange of electrons between two substances.

The reduction potential tells about the element that will be oxidized ad which will be reduced in the redox reaction.

Thus, the correct option is A. Which element will be oxidized and which will be reduced.

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Answer:

Option (A)

Which element will be oxidized and which will be reduced

Explanation:

Hopes this helps.

Answer:

46.15

Explanation:

In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure, that occurs naturally in pure form.

hope this helps

Answer:

SUBSTANCES

Explanation:

According to this question, Jasmine is conducting an experiment in order to see how much temperature change occurs when three different substances are heated. Based on this experiment, the INDEPENDENT VARIABLE, which is the variable that is changed or manipulated is SUBSTANCES.

A controlled experiment is an experiment where all other variables except the INDEPENDENT VARIABLE is kept the same or unchanged. The independent variable is the only variable allowed to change, which in this case is the SUBSTANCES USED.

A; Electron is your answer.

Answer:

Electron

Explanation:

An atom can either gain, share, transfer, and/or lose electron(s)

Answer:

1.4776 g

Explanation:

First, let us determine the number of moles present in  100 mL of 0.1005 M solution of Ca2+.

mole = molarity x volume in Liter

mole of Ca2+ = 0.1005 x 0.1 = 0.01005

Also,

mole = mass/molar mass

mass of 0.01005 mole Ca2+ = mole x molar mass

                 = 0.01005 x 147.02 = 1.4776 g

Since 1 mole of Ca2+ is present is 1 mole of CaCl2·2H2O, 1.4776 g of CaCl2·2H2O would be weighed out in order to prepare 00mL of a 0.1005M solution of Ca2+.

To prepare a 100 mL solution of 0.1005 M [tex]Ca^2^+[/tex], we would need to weigh out approximately 14.737 grams of [tex]CaCl_2.2H_2O[/tex].

We must use the molar mass and molarity formula to calculate the mass of [tex]CaCl_2.2H_2O[/tex] needed to make a 0.1005 M solution of [tex]Ca^2^+[/tex].

Let's start by figuring out how many moles of [tex]Ca^2^+[/tex]are needed for the solution:

Molarity (M) = moles/volume (L)

0.1005 M = x moles/0.1 L (100 mL converted to liters)

x = 0.1005 moles of [tex]Ca^2^+[/tex]

So, the molar mass of [tex]CaCl_2.2H_2O[/tex]:

Ca (40.08 g/mol) + 2Cl (35.45 g/mol) + 2([tex]H_2O[/tex]) (2 * 18.02 g/mol) = 147.02 g/mol

Then, we calculate the mass

Mass = moles * molar mass

Mass = 0.1005 moles * 147.02 g/mol

Mass = 14.737 grams

Therefore, to prepare a 100 mL solution of 0.1005 M [tex]Ca^2^+[/tex], we would need to weigh out approximately 14.737 grams of [tex]CaCl_2.2H_2O[/tex].

Learn more about Molar mass, here

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Answer:

this is the structure of beta myrcene but im notsure which structure you were looking for

Answer:

C - show 7 neutrons in the nucleus

Explanation:

Use process of elimination:

-Answer A will not work because electrons are not in the nucleus.

-Answer B will change the atom's identity from nitrogen to fluorine; it will not work.

-Answer D will create a nitrogen ion, which is not what the prompt is asking for (an atom); it will not work.

The only logical answer is C, as that is the only one that is also true.

Answer:

it has 79 protons

Explanation:

the atomic number is equal to the number of protons an element has.

On the periodic table, gold has the atomic number 79. This means that the gold has a total of 79 protons present inside its nucleus, as the number of protons signifies the atomic number.

The total number of protons present in an atom is known as the atomic number of that atom.

The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom

The current periodic table divides elements into groups according to their increasing atomic numbers.

The atomic number of gold is 79 on the periodic table. This indicates that the gold's nucleus has 79 protons in total, where the number of protons represents the atomic number.

Learn more about the atomic number from here,

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Answer:

Answer: He should add a single dot below the symbol to correct the electron dot diagram of an aluminium atom.

Explanation: Electron dot structures are the structures in which valence electrons around an atom are shown. The electrons are represented as dots in these structures.

Aluminium is the 13th element of the periodic table.

Electronic configuration of Aluminium is given by:

Valence electrons of aluminium = 3

In the given image, 2 valence electrons are shown and total number of valence electrons are 3. So, in order to correct the diagram, he should add a single electron below the symbol.

Explanation:

yes giuve me brainliest

Answer:

I would say A

Explanation:

normally wind and water will work together to erode or brake away a cliff or mountain.

There is an example of this in Illinois (There are eroded away cliffs located next to the Mississippi River, they stretch from around Grafton to Alton).

Answer:

14

Explanation:

Given parameters:

Number of protons  = 6

Number of electrons  = 6

Number of neutrons = 8

Unknown:

Mass number  = ?

Solution:

The mass number of an atom is the sum of protons and neutrons in an atom;

 Mass number  = number of protons + number of neutrons

 Mass number  = 6 + 8  = 14

Answer:

[OH⁻]= 6.76*10⁻¹² M

pH= 2.83

[H₃O⁺]= 1.48*10⁻³

Explanation:

The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution that indicates the concentration of hydroxyl ions [OH-] present in a solution. The pOH is defined as the logarithm of the concentration of OH- ions, with the sign changed:

pOH= -log[OH⁻]

In this case, pOH= 11.17. So:

11.17= -log [OH⁻]

Solving:

-11.17=log [OH⁻]

10⁻¹¹ ¹⁷= [OH⁻]

6.76*10⁻¹² M= [OH⁻]

pH, short for hydrogen potential, is a parameter that indicates the concentration of hydrogen ions [H⁺] or [H₃O⁺] that exist in a solution and is calculated as the logarithm of the concentration of H⁺ ions, with the sign changed:

pH= -log[H⁺]= -log[H₃O⁺]

The relationship between pH and pOH can be established by the expression:

pH + pOH= 14

In this case, being pOH=11.17:

pH + 11.17= 14

and solving you get:

pH= 14 - 11.17

pH= 2.83

Finally,  replacing this value in the definition of pH:

2.83= -log [H₃O⁺]

and solving you get:

-2.83= log [H₃O⁺]

10⁻² ⁸³= [H₃O⁺]

1.48*10⁻³=  [H₃O⁺]

Answer:

human can see visible light

Answer:

i beleive it is D. visible light

Explanation:

if im wrong sorry this subject isnt my forte

Answer:

u didn't give us the multiple hoice answer

Explanation:

Answer:

Here are the answer choices

Explanation:

A) Compounds contain atoms of at least two different elements.

B) Each element is made up of atoms.

C) Each element contains atoms with negatively charged particles.

D) Atoms within the same element have the same amount of mass.