Radium-222 undergoes radioactive decay to produce radon-218. Which
particle needs to be added to this equation to show that the total numbers of
neutrons and protons are not changed by the reaction?
22 Ra
21°Ra + ?
88
86
A. He
B. o
tie
c. Le
D. He

Answers

Answer 1

Answer:

2/4 HE

Explanation:

Ape.x


Related Questions

rock cycle define
in your own words​

Answers

Answer:

Explanation:

The rock cycle basically tell you how the different types of rocks are related to each other and tells how they change over time.

Hope this helped!!!

Answer:

The rock cycle is the process by which rocks of one kind change into rocks of another kind. Metamorphic rock is igneous or sedimentary rock that has been heated and squeezed. It can erode into sediment or melt into a hot substance known as refordium. It is formed under extreme pressure and temperature deep inside mountain chains. For example, sedimentary rock shale becomes slate when heat and pressure are added, thus transforming it into another state of rudementury.

charles law . who can please help me with these two problems asap ?

Answers

Answer:

k

Explanation:

Do you think baking a cake is or is not a chemical reaction

Answers

Answer:

yes

Explanation:

its an endothermic chemical reaction

Answer:

It is a chemical reaction because you cannot get back the original ingredients. if you can get the original ingredients back, it would be a physical change.

Hope this helped you out!!

A substance has a percent composition of 17.55% Sodium, 39.70%
Chromium, and 42.75% Oxygen. What is the empirical formula of the
substance? *

Need help anyone plz :)

Answers

Cr2Na2O7

Sodium Dichromate

What is the molar mass of a gas if 0.102 g of the gas occupies 0.070 L at STP? a. 32.6g / mol b. 28.2 g/mol c. 40.0g / mol d. 47.9 g/mol

Answers

Answer:

A. 32.6 g/mol

Explanation:

First convert the volume of gas to moles using the ratio 1 mol / 22.4 L at STP.

0.070 L • (1 mol / 22.4 L) = 0.00313 mol

Now divide the grams of gas by the moles of gas:

0.102 g / 0.00313 mol = 32.6 g/mol

A gas system contains 2.00 moles of O2 and CO2 gas, has an initial temperature of 25.0 oC and is under 1.00 atm of pressure. If the pressure remains constant and the temperature is raised to 45.0 oC, then what will the new volume (assuming a closed system) be?

Answers

Answer:

[tex]V_2=52.2L[/tex]

Explanation:

Hello there!

In this case, by bearing to to mind the given conditions, it is firstly possible to determine the initial volume of the closed system via the ideal gas equation:

[tex]PV=nRT\\\\V=\frac{2.00mol*0.08206\frac{atm*L}{mol*K}*298.15K}{1.00 atm} \\\\V=48.9L[/tex]

Which is V1 in the Charles' law:

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

And of course, T1 is 298.15 (25+273.15). Therefore, by solving for V2 as the final volume, we obtain:

[tex]V_2=\frac{V_1T_2}{T_1}\\\\V_2=\frac{48.9L*(45+273.15)K}{(25+273.15)K} \\\\V_2=52.2L[/tex]

Best regards!

i cant help you with math and science homework or project just email at shahlaalgow g mail com

Answers

Answer:

thanks

Explanation:

CsBr formula name???

Answers

Answer

PubChem CID/molecular formula

Explanation:

Cesium bromide

PubChem CID 24592

Molecular Formula CsBr or BrCs

Synonyms CESIUM BROMIDE 7787-69-1 Caesium bromide Cesiumbromide Cesium bromide (CsBr) More...

Molecular Weight 212.81 g/mol

Component Compounds CID 260 (Hydrogen bromide) CID 5354618 (Cesium)

have a good day /night

may i please have a branllist

If you picked up a hot coffee mug with lots of thermal energy using your hand, where will the thermal energy transfer to?

Answers

Answer:

It will go to your hand.

Explanation: If you touch a hot cup/mug you'll most likely burn yourself, so it would probably go to your hand.

Which of these are found in eukaryotic cells?
1. nucleoid
2. vacuole
3. mitochondria
4. Golgi apparatus
O A. 1, 3, 4
O B. 1, 2,4
O C. 2, 3, 4
O D. 1, 2, 3

Answers

Answer:

C

Explanation:

nucleoid is prokaryotic

Answer:

mitochondria is found in eukaryotic cells.

The sum of the kinetic energy and the potential energy of a particle is its

Answers

Answer:

he total mechanical energy E of a particle is defined as the sum of the kinetic and potential energies

Explanation:

Answer:

thermal energy

Explanation:

Add an oxide ion to Fe2O3

Answers

Answer:

Iron Oxide (Fe2O3) also known as rust is also an ionic bond, it has metallic compound Iron (Fe) which contains positively charged cations and it has nonmetallic compound Oxygen (O) which contains negatively charged anions.

Explanation:

i hope it help

The symbol for free energy is
a. DG.
b. DS.
c. DT.
d. DH.

Answers

I think the answer is A but I’m not 100% sure

6.An ice cube that has a mass of 20 g is in a sealed container. As the container is heated, the ice first melts, but eventually it changes to water vapor.

A)The temperature at which the ice melts is ____________________.

B) Compare the motion of the particles in each state

Answers

Answer:

See explanation

Explanation:

a) Every substance melts at a particular temperature known as the melting point of the substance. The melting point of ice is 0°C. Hence ice melts at  0°C.

b) There are three states of matter; solid liquid and gas. The particles of matter in each stage of matter possess varying degrees of freedom.

In the solid state, the intermolecular forces between the particles of water that compose ice are very strong. Hence the particles do not translate, they only vibrate or rotate about their mean positions.

In the liquid state, the magnitude of intermolecular interaction is less than that of the solids hence the molecules can translate but not with a high kinetic energy.

In the gaseous state, there is a minimum intermolecular interaction between particles theoretically hence the particles are really free to move about with a very high kinetic energy.

How many moles of O2 are dissolved n 10.0 L of a 0.001 mol dm-3 solution?

Answers

Answer:

[tex]0.01molO_2[/tex]

Explanation:

Hello there!

In this case, by considering the definition of molar solution as the moles of solute over volume in liters or cubic meters of solution, we can see that actually 10.0 L of the solution are equal to 10.0 dm³. In such a way, since the concentration is 0.001 mol / dm³, the moles of oxygen that are dissolved turn out to be:

[tex]0.001mol/dm^3 * 10.0dm^3\\\\0.01molO_2[/tex]

Best regards!

How many grams are in 32.2 L of CO2?

Answers

Answer:

63.25 grams of CO₂

Explanation:

To convert from liters to grams, we first need to convert from liters to moles. To do this, we divide the liters by 22.4, the amount of liters of a gas per mole.

32.2 / 22.4

= 1.4375 moles of CO₂

Now we want to convert from moles to grams. To do this, we multiply the moles by the molar mass of CO₂. The total molar mass can be found on the periodic table by adding up the molar mass of carbon (12) and two oxygen (32).

12 + 32 = 44

Now we want to multiply the moles by the molar mass.

1.4375 • 44

= 63.25 grams of CO₂

This is your answer.

Hope this helps!

Calculate the mass percent of hydrogen in 70 g of C4H8O3?​

Answers

Answer:

7.14%

Explanation:

From the question,

percentage by mass hydrogen in C₄H₈O₃ (h)   = mass of hydrogen present in C₄H₈O₃(m)/molar mass of C₄H₈O₃ (m')

h = (m'/m)×100..................... Equation 1

Given: m' = (14×4)+(1×8)+(16×3) = 56+8+48 = 112 g, m =  (1×8) = 8 g

Substitute these values into equation 1

h = (8/112)×100

h = 7.14%.

Hence the percentage of hydrogen in 70 g of C₄H₈O₃ is 7.14%

For each of the following, predict the complete, balanced chemical equation for the reaction that occurs when they are mixed. Make sure to label the states!
1. HNO3 & NaOH
2. Sr(OH)2 & HI

Answers

Answer:

1. The balanced chemical reaction is:

[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]

2. The balanced chemical reaction is:

[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reactions, it is necessary to keep in mind the cations and anions are switched around as a result of the bonds rearrangement in these neutralization reactions; therefore, we can proceed as follows:

1. The balanced chemical reaction is:

[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]

Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.

2. The balanced chemical reaction is:

[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]

Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.

Best regards!

The concentration of H3AsO3 in a solution is determined by titrating it with a 0.1741 M Ce4+ solution. The balanced net ionic equation for the reaction is: 2Ce4+(aq) + H3AsO3(aq) + 5H2O(l) 2Ce3+(aq) + H3AsO4(aq) + 2H3O+(aq) In one experiment, 18.68 mL of the 0.1741-M Ce4+ solution is required to react completely with 30.00 mL of the H3AsO3 solution.
Calculate the concentration of the H3AsO3 solution.

Answers

Answer:

0.0542 M

Explanation:

Let;

CA = concentration of Ce4+ solution = 0.1741 M

VA = volume of Ce4+ solution = 18.68 mL

CB = concentration of H3AsO3 = ?

VB  = volume of H3AsO3 = 30.00 mL

NA = Number of moles of Ce4+ solution = 2

NB = Number of moles of H3AsO3  = 1

From;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CB = CAVANB/VBNA

CB = 0.1741 * 18.68 * 1/30.00 * 2

CB = 0.0542 M

Composition of the air breathed in and the air breathed out changes

Answers

Answer:

breathed in air contains oxygen while breathed out air contains higher percentage of CO2

2C10H22 + 3102
20CO2 + 22H2O
What mass of O2 is needed to react completely with 7.5 grams of C10H22?

Answers

Answer:

2c11h21

Explanation:

write the chemical equation of sodium reacts with hydrochloric acid​

Answers

Answer:

NaOH + HCl → H2O and NaCl.

Explanation:

plzz mark as brainliest

Answer:

NaOH + HCl → H2O and NaCl.

Explanation:

I'm not sure 100%, but I think so...

What is the mass of 3.5 x 10 23 molecules of co2

Answers

Answer:

x = 3/6.02 = 0.50.

Explanation:

1 mole of CO2 has 6.02 x 10^23 molecules of CO2.

Say x moles of CO2 has 3.0x10^23 molecules of CO2.

Therefore x = 3/6.02 = 0.50.

4.4 mol nitrogen.

VN2 = ____L

Answers

Answer:

99 L

Explanation:

Step 1: Given data

Moles of nitrogen: 4.4 moles

Step 2: Calculate the volume occupied by 4.4 moles of nitrogen

The volume occupied by a gas depends on other conditions such as pressure  (P) and temperature (T). If we have this information, we can calculate the volume of the gas using the ideal gas condition.

P × V = n × R × T

Since the task doesn't inform the conditions, we can assume it is under standard pressure (1 atm) and temperature (273.15 K). At STP, 1 mole of any gas occupies 22.4 L.

4.4 mol × 22.4 L/1 mol = 99 L

True or False: Having a greater volume definitely means a lower concentration (molarity) solution

Answers

Thus the molarity is inversely proportional to the volume which means if we increase the volume value of the molarity decreases whereas if we decrease the volume the concentration or molarity would be increased. So the greater the volume lower the concentration of the solution.

Having a greater volume definitely means a lower concentration (molarity) of solution. So, the statement is true.

What is meant by molarity of a solution ?

Molarity of a solution is defined as the number of moles of solute present per unit volume of solution.

Here,

Since, the number of moles of solute in one litre of solution is known as the molarity, we can say that the change in volume of the solution will affect the molarity of the solution.

Molarity, M = n/V

where n is the number of moles of solute and V is the volume of solution

From the equation, we can say that the molarity of the solution is inversely proportional to its volume.

We know that, molarity of a solution is a temperature dependent parameter.

As the volume of the solution increases, the temperature also increases( Volume [tex]\alpha[/tex] Temperature). When the temperature increases, it affects the molarity of the solution such that the number of moles remains constant and as a result of the increasing volume, the molarity decreases.

Hence,

Having a greater volume definitely means a lower concentration (molarity) of solution.

To learn more about molarity, click:

https://brainly.com/question/29884686

#SPJ2

Directions: Read each sentence carefully. Write the letter of the
correct answer on the answer sheet provided.
1. What is produced when two surfaces rub against each other?
A. air
B. pressure
C. motion
D. friction
2. Which surface increases friction?
A. polished B. rough
C. lubricated
D. shiny
3. What causes falling objects to fall?
A. speed
B. gravity
C. acceleration
D. wind
4. Which surface decreases friction?
A. smooth B. rugged
C. rough
D. rocky
5. Why do you move faster when running down a hill?
A. Gravity pulls you up.
C. Gravity pulls you down.
B. Wind pushes you back.
D. Wind pulls you.​

Answers

Answer:

1 - D) friction

2- B) rough

3- B) gravity

4- A)smooth

5- C)gravity pulls you down

The gas phase decomposition of nitrogen dioxide at 383 °C

NO2(g)NO(g) + ½ O2(g)

is second order in NO2 with a rate constant of 0.540 M-1 s-1.
If the initial concentration of NO2 is 0.477 M, the concentration of NO2 will be
M after 12.4 seconds have passed.

Answers

Answer:

[tex][NO_2]=0.112M[/tex]

Explanation:

Hello there!

In this case, since the second-order integrated law is given by the following equation:

[tex]\frac{1}{[NO_2]} =\frac{1}{[NO_2]_0}+kt[/tex]

Thus, given the initial concentration of the nitrogen dioxide gas, the rate constant and the elapsed time, we obtain:

[tex]\frac{1}{[NO_2]}= \frac{1}{0.477M} +0.54M^{-1}s^{-1}\\\\\frac{1}{[NO_2]}=8.933M^{-1}[/tex]

[tex][NO_2]=\frac{1}{8.933M^{-1}} =0.112M[/tex]

Best regards!

What is the mean of magnetic susceptibilty?​

Answers

Answer:

Magnetic susceptibility is the degree to which a material can be magnetized in an external magnetic field. If the ratio between the induced magnetization and the inducing field is expressed per unit volume, volume susceptibility (k) is defined as.

Explanation:

good luck

An alpha particle is an ionized helium nucleus, consisting of 2 protons and 2 neutrons bound together. When alpha particles are beamed toward a thin metal foil, most of them pass through, undergoing a small deflection, while a small fraction of them bounce back at much larger angles in excess of 90 degrees relative to their incoming direction. The reason this happens is that Group of answer choices

Answers

Answer:

Due presence of empty as well as heavy particles.

Explanation:

The main reason for this is the presence of empty spaces as well as heavy particles in the nucleus of Helium atom. Most of the beam pass through the helium atom due to the presence of empty spaces in the atom whereas some beams deflect from the helium atom because both repel each other due to same charge i.e. positive charge. Few beams of light bounce back with an angle of 90 degree due hitting with the nucleus where heavy particles such as neutron and proton are present.

What is the chemical formula for Manganese (IV) biphosphate?
Group of answer choices

Mn(HPO4)2

Mn2(HPO4)4

Mn4(HPO4)2

Mg2(HPO4)4

No correct response

Answers

I believe its the first one because manganese is mn and IV is 4 but the cross thing thing will making it the second one but then you have to simplify making it the first one i hope that helps:)
Other Questions
Read the excerpt from "Revolution 2137."Its now or never, Lena said to herself. She yanked the wires from the wall.The city plunged into darkness. Meg and Lena could hear the robot pounding on the door. They knew it would run out of power soon. Lena gave Meg a hug. "I cant believe we did it! Lena said. "Were free."Were all free, Meg replied.A great cheer rose up in the streets as joy lit every human heart.Which question will best help readers understand the resolution?a)Why are all the people cheering in the dark?b)Where does this story take place?c)What preparations did Meg and Lena make?d)Who is Lenas greatest enemy? Can somebody plz help answer the question for the week gossple (In the picture) only if somebody wants to help with this thx :3WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD! Alex is saving money at a constant rate. Suppose she initially has $170 saved, and after 5 months, she has $420 saved.Which of these expresses the rate at which Alex is saving? Write an algorithm and corresponding flowchart for a program that prints multiple of 5 starting with 100 and ending with 180. Which temperature is warmer, -6 or -9 please help! decide whether the line it represents is parallel to p, perpendicular to p, or neither or these. 1) y=-3x+10 2) y-5= -1/3(x+2) 3) y=1/3x4) -3x+y=1 simplify[tex] {a}^{2} - {b}^{2} [/tex] Kelly paid $45.36 for a sweater that was on sale for 25% off the original price. She paid 8% sales tax on the sale price. What was the original price of the sweater, in dollars Melanie cuts a rectangle out of a piece of scrap paper as shown. She wants to calculate the angle measure of the piece that is left over. What is the measure in degrees? The process of meiosis is illustrated here. The outcome of meiosis is very important in the sexual reproduction and life cycle ofdiploid organisms. Evaluate these statements and determine which ones accurately describe the outcome of meiosis. You may selectALL that apply.-)A)Meiosis produces genetically diverse cells.B)Meiosis increases genetic variation in the offspring.C)Meiosis produces haploid cells from a diploid parent cellD)Meiosis increases the genetic content in the daughter cells.E)Meiosis maintains the number of chromosomes originally present in theparent cell. 1. A wave on a rope has a wavelength of 2.0m And a frequency of 2.0 Hz. What is the speed of the wave?Plzzzzzzz help!!! 7 Aiden volunteers on the weekend at the central ledbury as a school project to record how many people visit the library and where it go on Saturday 487 people went to the years between 446 people went to social issues 335 what do in literacy on Sunday the library thousand three hundred total visitors Basil Hayden have recorded on Saturday about how many people should be expected to go to social issues round your answer to the nearest whole number Idu ate a bad batch of clam chowder and became ill with food poisoning. Now he finds that even the smell of clam chowder can make him feel queasy. In this example, the unconditioned stimulus is ____. coefficient of 3+4x-7 Keli is unable to find a shape that meets her needs. Which feature in Power Point should she use to create shapes that are completely customized? Each face of a small cube has a surface area of 0.25 square meters. A larger cube has edges that are six times as long as the edges of the small cube. What is the volume of the larger cube? Describe the events of anaphase two Which is a measure of the efficiency of an investment?A.efficiency cocfficientB.return on investmentC.return rato How to solve for shaded area please help me i need this done or i go to jail