1. When the Moon is in the position shown how would the Moon look from Earth?
Sun
A
B
C
D
O A View A
OB View B
OC. View
O View

Answer:

1.66 basic

Explanation:

Answer:

a. 5.77L

b. 700mmHg

c. 395K

Explanation:

Using PV = nRT we can solve these problems where:

P is pressure of the gas in atm (1atm = 760mmHg)

V is volume in liters

n are moles of the gas

R is gas constant: 0.082atmL/molK

T is asbolute temperature in K

a. PV = nRT

V = nRT/P

P = 773mmHg*(1atm/760mmHg) = 1.017atm

T = 25°C+273 = 298K

V = 0.240mol*0.082atmL/molK*298K / 1.017atm

V = 5.77L

b. PV = nRT

P = nRT/V

P = 0.0947mol*0.082atmL/molK*309K/0.635L

P = 0.9216atm * (760mmHg/1atm) = 700mmHg

c. PV = nRT

PV/nR = T

P = 727mmHg * (1atm / 760mmHg) = 0.9566atm

0.9566atm*13.3L/0.393mol*0.082atmL/molK = T

T = 395K

Answer: There are 0.25 moles of NaOH  in a sample that weighed 10g.

Explanation:

Given: Mass of NaOH = 10 g

Molar mass of NaOH is 40 g/mol.

Number of moles is the mass of substance divided by its molar mass.

Therefore, moles of NaOH are calculated as follows.

[tex]No. of moles = \frac{mass}{molarmass}\\= \frac{10g}{40 g/mol}\\= 0.25 mol[/tex]

Thus, we can conclude that there are 0.25 moles of NaOH  in a sample that weighed 10g.

Answer:

12 moles

Explanation:

Answer:

d) group 18

Explanation:

Group 18 on the periodic table consists of noble gasses, which do not chemically interact with other elements.

Answer:

im not a brain wiz but i think 20

Explanation:

Answer:

A. Ernest Rutherford

B.Bohr

C. Eugen Goldstein

D.. Santiago Ramon y cajal

E.john Dalton

F.isobars - a line drawn on a weather map connecting points of equal pressure is called isobars.

example.. argon 40

potassium 40

.two differences between isobars and isotopes.

isobars are those elements which have different atomic number but the same mass number. while isotopes are those elements having the same atomic number and different mass number..

two uses of isotopes.

uranium 235 - for nuclear fission and as fuel in unclear reactors.

# an isotope cobalt - used In the treatment for cancer

# an isotope iodine - used in treatment of goiter.

Answer:

21

Explanation:

Answer:

Temperature= -327.2 celsius

Explanation:

You can set up an equation:

-104 = x

71.8 225.9

Answer:

0.274 L

Explanation:

Applying Boyle's law,

PV = P'V'................. Equation 1

Where P = Initial pressure, V = Initial volume, P' = Final pressure, V' = Final volume.

make V' the subject of the equation,

V' = PV/P'............. Equation 2

From the question,

Given: P = 500 mm Hg, V = 500 mL = 0.5 L, P' = 1.2 atm = 912 mm Hg

Substitute these values into equation 2

V' = (0.5×500)/912

V' = 0.274 L

Hence the new volume is 0.274 L

Answer:

Of expected product

Explanation:

Percent yield is the quantity of product actually produced compared to the quantity of expected product and the correct option is option C.

Percent yield is the ratio of actual yield divided by theoretical yield multiplied by 100. It gives information regarding the percentage of products formed in the reaction.

Percentage yield = Actual yield / Theoretical yield × 100

Percent yield is very important in the manufacture of products.

Percent yields are understandably less than  100%, however, percent yields greater than  100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually would be if the product was pure.

Theoretical yield is the expected amount of products formed in the reaction.

Therefore, percent yield is the quantity of product actually produced compared to the quantity of expected product and the correct option is option C.

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Answer:

B and C are correct

Explanation:

a) false, pressure increases when volume decreases and temperature increases

b) true, pressure and temperature are directly proportional

c) true, pressure and volume are inversely proportional

d) false, pressure and amount of gas are directly proportional

all of these relations can be summarized by the ideal gas equation:

pV = nRT

p: pressure

V: volume

n: amount of substance

R: gas constant

T: absolute temperature

Answer:

Fluorine

Explanation:

It has 9 protons ( Mg has 12 ) and it is in the same family as Br - bromine That is group 7.

HOPE THIS HELPED

Fluorine is the element in the same family as Br, but fewer proton than Mg.

Proton is positively charged. Proton is a subatomic particle which builds the atom.

Number of proton = Number of electrons = Atomic number

Halogens are non metallic elements in periodic table. It belongs to group 17 in the periodic table. Halogen family consists six element that is Fluorine, Chlorine, Bromine, Iodine, Astatine and Tennessine.

Magnesium has 12 protons. Fluorine has 9 protons. Chlorine has 17 protons that is much more than the Magnesium. Fluorine belongs the same family that is halogen family as Br.

Thus, we can say that Fluorine is the element in the same family as Br, but fewer proton than Mg.

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Answer:

1.49kJ

Explanation:

Using the formula as follows;

Q = m × c × ∆T

Where;

Q = amount of heat (joules)

m = mass (g)

c = specific heat of silver (J/g°C)

∆T = change in temperature (°C)

According to the information given in this question;

mass of Silver (Ag) = 236g

c of Ag = 0.24 J/g°C

initial temperature (T1) = 8.5°C

final temperature (T2) = 34.9°C

∆T = T2 - T1 = 34.9 - 8.5 = 26.4°C

Using Q = m × c × ∆T

Q = 236 × 0.24 × 26.4

Q = 1,495.3 Joules

Amount of heat needed to raise the temperature of Silver (Q) in kilojoules is 1495.3/1000 = 1.4953

Q = 1.49kJ

Answer:

pH = 3.42

Explanation:

Para calcular el pH necesitamos usar la siguiente expresión:

pH = -log[H⁺]

Por tanto, solo necesitamos reemplazar el valor dado de [H⁺] en la expresión anterior y se determina su pH:

pH = -log(3.8x10⁻⁴)

Por tanto el pH de la muestra de jugo de limón es 3.42

Answer:

A.They have high kinetic energy, which can be converted into electrical or mechanical energy

Explanation:

The kinetic energy of the fast-moving water turns turbines, which drive generators that produce electricity. The energy in fossil fuels (coal, oil, gas) is Chemical Potential Energy.

Answer:

open system

Explanation:

it needs to loose mass not gain mass

Answer:

2 moles of Substance B

Explanation:

Because 1 mole of any substance contains 6.02× 10²³ particles either atoms, molecules, ions or even electron(Avogardo Constant)

Therefore 12.04 × 10²³/ 6.02× 10²³  =  2 mole of Substance B

Answer:

20 degrees

Explanation:

Applying the second law of reflection,

Second Law of reflection: The law of refelection states that the incident angle, reflected angle.

Mathematically, it can be expressed as

i = r...................... Equation 1

From the question, we were told that the light strik the plane at an angle of 20 degrees to the normal.

Therefore,

i = 20 degrees.

If i = 20 degrees,

then,

r = 20 degrees.

Answer:

guizzes

Explanation:

guizlet

Answer:

2. 8 moles of carbon dioxide can be produced from 12.5 moles of oxygen. 1 mole of octane can be produced from 8 moles of carbon dioxide gas.

Explanation:

hope this helps :)

Answer:

9.92

Explanation:

Since we are given the concetration of H+ we can find the ph by taking the negative log and then subtracting the ph from 14 to give us pOH

-log(8.26e-5) = pH= 4.08

pOH= 14-4.08

pOH= 9.92

Answer:

2,702.7027 I think ...

Answer:

1.66 basic

Explanation:

Answer:

Given Elements are

Na>Zn>Fe>Cu>Ag

[tex]\setlength{\unitlength}{0.8 cm}\begin{picture}(20,15)\thicklines\put(5,9.5){\large {\boxed{ \sf{Reactivity \: series}}}}\put(0.8,8){\large\sf K \qquad\qquad\qquad Potassium\qquad\qquad\qquad \: maximum}\put(0.8,7.2){\large\sf Na \qquad\qquad\qquad Sodium\qquad\qquad\qquad\quad \: reactivity}\put(0.8,6.2){\large\sf Ca\qquad\qquad\qquad \: Calcium}\put(0.8,5.2){\large\sf Mg\qquad\qquad\quad \: Magnesium}\put(0.8,4.2){\large\sf Al\qquad\qquad\qquad \: Aluminium\qquad\qquad\qquad \: decreasing}\put(0.8,3.2){\large\sf Zn\qquad\qquad\quad\qquad \: Zinc\qquad\qquad\qquad\qquad \:reactivity}\put(0.8,2.2){\large\sf Fe\qquad\qquad\quad\qquad Ferrous}\put(0.8,1.2){\large\sf Pb\qquad\qquad\qquad \: \:\: Lead}\put(0.8,0.2){\large\sf H\qquad\qquad\qquad \: \:Hydrogen}\put(0.8, - 0.6){\large\sf Cu\qquad\qquad\qquad \: Copper}\put(0.8, - 1.5){\large\sf Hg\qquad\qquad\qquad \: Mercury}\put(0.8, - 2.5){\large\sf Ag\qquad\qquad\qquad \: \:Silver}\put(0.8, - 3.5){\large\sf Au\qquad\qquad\qquad \: \: Gold\qquad\qquad\qquad\quad \: \: minimum reactivity}\put(9.3,8.2){\vector(0, - 2){12}}\end{picture}[/tex]

The answer is C, Uranium.

Natural gas, coal, and oil are all naturally made from fossils. Uranium is an element which can be found on the Periodic Table of Elements.

C. Uranium

... ... ... ...

Answer:

SOUND WAVE (carried by thin metal inside the phone) ⇒ELECTRICAL ENERGY (over the wire) ⇒SOUND WAVE (that is heard by someone on the side of the phone)

Explanation:

A wave that is comprised of compression and refraction, by which sound is propagated in an elastic medium such as air.

The sound waves are carried to a thin metal disk inside the phone, known as the diaphragm, and are converted into electrical energy. The electrical energy travels over wires to another phone and is converted from electrical energy to sound waves again which can be heard by the one on the other end of the phone.

In this way, sound reaches our ears.

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Answer:

Alpha Decay

Explanation:

Answer:

The answer for this would be Alpha Decay

Explanation:

If this is a late answer I apologize but I hope others may find this helpful :)