help please it's due in 12 hours
(20 points)

Help Please It's Due In 12 Hours(20 Points)

Answers

Answer 1

Answer:

1) K and Rb

2) 20 protons, 20 neutrons, and 20 electrons.

Explanation:

1) If it's in the same column, it has the same # of valence electrons (e- on the outer shell), therefore similar chemical properties.

2)

1) atomic #, 20, is the number of protons

2) subtract the mass number from # of protons, which you get 20 neutrons

3) Number of electrons in a neutral atom = number of electrons, which is 20. You can also check yourself by looking at electron configuration on a full periodic table.


Related Questions

Which lists only abiotic factors in this environment?

grass, tree, rock, soil
bird, turtle, grass, tree
sun, water, grass, soil
water, rock, soil, sun

Answers

In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.

What is an abiotic factor?

An abiotic factor is a non-living part of an ecosystem that shapes its environment.

Biotic and abiotic factors make up a community via interaction.

Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.

Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun

Learn more about the abiotic factor here:

brainly.com/question/10111151

#SPJ1

How long are tortillas good for after expiration date?.

Answers

Answer:

Tortillas generally last for a week after their "best by" date on the counter and about a month if placed in the fridge. But it sometimes depends on how they are stored

Explanation:

Hope this helped

help me pls thank u oh and worth a brainly

Answers

The next step in the engineering design process is to identify the criteria and constraints of the process.

What is engineering design?

The process of engineering design has to do with the fabrication of new materials or the reworking of existing materials to fit into certain pre-specified objectives.

In this case, the next step in the engineering design process is to identify the criteria and constraints of the process.

Learn more about engineering design:https://brainly.com/question/18564178

#SPJ1

Use the IUPAC rules to name the following structures.

Answers

1-ethyl-3-propylcyclopentane1,2-dimethylcyclopentene1,3,5-Triethylbenzene

What is IUPAC rule?

The IUPAC nomenclature system is a set of logical rules devised and used by organic chemists to circumvent problems caused by arbitrary nomenclature.

The 1-ethyl-3-propylcyclopentane molecule contains a total of 30 bond(s) There are 10 non-H bond(s), 3 rotatable bond(s) and 1 five-membered ring(s).

The 1,2-dimethylcyclopentene molecule contains two methyl groups and one double bond in the ring.

The 1,3,5-Triethylbenzene molecule contains three ethyl groups and a benzene ring.

Learn more about the IUPAC rule here:

https://brainly.com/question/11587934

#SPJ1

Please help!! Needed by today!!

Answers

Answer:

heres your answer 50gms

what is the specific heat capacity of propan-1-ol​

Answers

Answer:

14

Explanation:

sun normal persentage is 14

If the empirical formula for a compound is NO2 and the molecular mass is 230.05 g/mol, what is the molecular formula for the compound? fast

Answers

Answer: [tex]\text{N}_{5}\text{O}_{10}[/tex]

Explanation:

The atomic mass of nitrogen is 14.0067 g/mol.The atomic mass of oxygen is 15.9994 g/mol.

This means the molecular mass of nitrogen dioxide is [tex]14.0067+2(15.9994)=46.0055[/tex] g/mol.

Dividing this molecular mass of the compound we need to find, we get that

[tex]\frac{230.05}{46.0055} \approx 5[/tex].

So, the final answer is [tex]\boxed{\text{N}_{5}\text{O}_{10}}[/tex]

solve for x
[tex] \bold{x^{2} + 6x + 5 = 0}[/tex]

ty! ~

Answers

Answer:

x²+6x+5=0

On comparing with the equation

ax² + bx + c = 0

a=1, b = 6 and c = 5

Now

b²– 4ac = 6² – 4 x 1 x 5 = 36 - 20 = 16

[tex]x = \frac{ - b \:± \: \sqrt{b {}^{2} - 4ac } }{2a} \\ \\ x = \frac{ - 6\:± \: \sqrt{16 } }{2 \times 1} \\ \\ x = \frac{ - 6± {4} }{2} \\ \\ x = \frac{ - 6 + {4} }{2} \: \: or \: \: x = \frac{ - 6 - {4} }{2} \\ \\ \implies \: x = \frac{ \cancel-2 }{ \cancel2}^{-1 }\: \: or \: \: x = \frac{ \cancel-10 }{ \cancel2}^{-5}\\ \\ \implies \: { \blue{\fbox{ \: x = - 1 \: \: \: or \: \: \:x = - 5}}}[/tex]

[tex] {x}^{2} + 6x + 5 = 0 \\ \\ {x}^{2} + 5x + x + 5 = 0 \\ \\ x(x + 5) + 1(x + 5) = 0 \\ \\ (x + 1)(x + 5) = 0.[/tex]

[tex]x = - 1 \\ x = - 5.[/tex]

4. How can extinct species be saved?

O by helping their numbers increase beyond "critical mass"

by increasing their population numbers

Oby encouraging mating in zoos

They cannot. Extinction is forever.

Answers

Extinct species be saved by increasing their population numbers and is denoted as option B.

What is Population?

This is defined as the total number of organisms in a particular area at a given period of time.

Extinct species can be saved by increasing their population through conservation and public awareness.

Read more about Extinct species here https://brainly.com/question/1048615

#SPJ1

What happens to the particles in hot water when it cools down

Answers

Answer:

its particles slow down and come closer together.

Which equation represents an addition reaction?

(1) c3h6 + cl2 c3h6cl2

(2) caco3 cao + co2

(3) cacl2 + na2co3 caco3 + 2nacl

(4) c3h8 + cl2 c3h7cl + hcl

Answers

c3h6 + cl2---- c3h6cl2 is a type of  equation represents an addition reaction because new products are formed.

What is addition reaction?

Addition reaction is a type of reaction in which one molecule combines with another to form a bigger molecule having no other products. We can see that the above reaction has no byproduct.

So we can conclude that c3h6 + cl2---- c3h6cl2 is a type of  equation represents an addition reaction because new products are formed.

Learn more about reaction here: https://brainly.com/question/26018275

#SPJ1

How does engineering affect the amount of human labor needed to harvest rice?

Answers

Answer:

Yes

Explanation:

The first step of harvesting is draining the paddy. Next, farmers cut the plants -- with a scythe or sickle if by hand -- and transport them elsewhere to be laid out and dried for two or three days. Rice can be cut by hand or machine. In the developed world, harvesting by hand is still very common.

A container contains three gasses, N2, O2 and Ar, with partial pressures of 23.3 kPa, 40.9 kPa and 13.7 kPa respectively. What is the total pressure inside the container

Answers

P_N2 = 23.3 kPa
P_O2 = 40.9 kPa
P_Ar = 13.7 kPa
P_total = P_N2 + P_O2 + P_Ar
P_total = 23.3 kPa + 40.9 kPa + 13.7 kPa
P_total = 77.9 kPa

what is the molarity of a nitric acid solution HNO3 if 20 ml of the solution is needed to exactly neutralize 10 ml of a 1.67 M NaOH solution?

Answers

Answer: 0.84 M

[tex]M_{A}V_{A}=M_{B}V_{B}\\(20)M_{B}=10(1.67)\\M_{B}=\frac{10(1.67)}{20} \approx \boxed{0.84 \text{ M}}[/tex]

help help help help help help

Answers

The exercise requires you to complete the sentences using the drop down. The complete sentences are given below.

Which step in the design process is represented by each of the following?

The topic that was chosen because many students experienced cracked cell phone screens is: Protecting Cell Phones;Discussing ideas for possible cell phone cases: Phones that are durable;Writing down their list of requirements needed to make the phone case: Colorful and funky.

Learn more about completing sentences at:
https://brainly.com/question/2339462
#SPJ1

Convert molecules of vitamin d (molar mass 384.7 g/mol) to grams of vitamin d.

Answers

The 6.023 * 10²³  molecule means  384.7 grams of Vitamin D.

What is a mole ?

A mole is a universal unit used to measure large number of atoms , molecules of an element.

one mole is equal to the Avogadro's Constant.

Mole is equal to the ratio of the mass of a compound to its molecular weight

It is given that Vitamin D is present

no. of molecule = 6.023 * 10²³

6.023 * 10²³ molecule constitutes of 1 mol

1 mole  is equal to the molar mass of a compound/ element

Therefore 1 mole = 384.7grams of Vitamin D

and hence 6.023 * 10²³  molecule means 384.7 grams of Vitamin D.

To know more about Mole

https://brainly.com/question/26416088

#SPJ1

Express this number in scientific notation.

31,000,000,000

Answers

Answer:

3.1 x 10^10

Explanation:

there are 9 zeroes, so the quick way is too just add a one to the 9 and you get 10, so that is your power.

If the pressure starts at 36 Kia what is the final pressure

Answers

answer:

is Well-Known Member. For a 35" you should be in the 28-32 range on road.

Explanation:

your welcome make brainlist

Hydrogen and iodine gas react to form hydrogen iodide, as shown in the equation H2(g) + I2(g) → 2HI(g). Suppose you are given a time interval from t1 = 10 seconds to t2 = 20 seconds and a change in H2 concentration from0.210 mol/L to 0.185 mol/L. Use the reaction rate equation to calculate the average reaction rate during that time period. Show your work.

Answers

The average reaction rate during that time period is 0.0025 mol/l.

What is concentration?

The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.

Given data:

[tex]t_1[/tex] = 10 seconds

[tex]t_2[/tex] = 20 seconds

[tex]C_1[/tex] = 0.210 mol/L

[tex]C_2[/tex] = 0.185 mol/L

∆C = |[tex]C_2[/tex]–[tex]C_1[/tex]| = |0.185-0.21| = 0.025 mol/l

∆t = [tex]t_2[/tex]– [tex]t_1[/tex] = 20 - 10 = 10 sec

∆C — is the concentration change

∆t — is the time change

V — reaction rate

V=  [tex]\frac{\Delta C}{\Delta t}[/tex] = [tex]\frac {0.025}{10}[/tex]= 0.0025 mol/l•sec

Hence, 0.0025 mol/l is the average reaction rate during that time period.

Learn more about the concentration here:

https://brainly.com/question/10725862

#SPJ1

correct way for calculating atomic mass

Answers

Answer:

mass number = protons + neutrons.

Explanation:

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.

The graph below shows how the temperature and volume of a gas vary when
the number of moles and the pressure of the gas are held constant. How can
the volume of the gas in a sealed container be decreased if the pressure is
constant?
T
A. By letting the gas diffuse over time
B. By lowering the temperature
C. By raising the temperature
D. By letting the gas effuse over time

Answers

The volume of the gas in a sealed container would be decreased at constant pressure: C. by raising the temperature.

What is Charles law?

Charles law states that when the pressure of an ideal gas is kept constant, the volume of a gas is directly proportional to the absolute temperature of the gas.

This ultimately implies that, the volume of a gas decreases at constant pressure when its temperature is decreased and vice-versa.

In conclusion, we can infer and logically deduce that the volume of the gas in a sealed container would be decreased at constant pressure by raising the temperature in accordance with Charles law.

Read more on Charles law here: https://brainly.com/question/888898

#SPJ1

16) a 110,52 g sample of mineral water is analyzed for its magnesium content. the mg2+ in the sample if first precipitated as mgnh4po4 and the precipitate is then converted to mg2p2o7 which is found to weigh 0,0549 g. express the quantity of magnesium in the sample in ppm (g of mg per million grams of h2o)

Answers

The amount of the magnesium in the sample in ppm is 497 ppm.

What is parts per million?

The term parts per million refers to one of the manners in which concentration is expressed. It is common in oceanography and analytical chemistry.

Given that;

Mass of Mg= 0.0549 g

Mass of the sample = 110.52 g

Amount in PPM = 0.0549 g/110.52 g * 10^6

= 497 ppm

Learn more about ppm:https://brainly.com/question/16727593

#SPJ1

Identify each described physical separation technique. a liquid is carefully poured out, leaving the solid behind in the container. choose... a solid is caught on paper or a membrane while the liquid passes through. choose... a solid mixture is heated. one component transitions directly between solid and gas. choose... a solvent is added to dissolve only one mixture component and then the liquids are separated.

Answers

Decanting, filtration, sublimation and distillation are the separation techniques.

Identify the physical separation technique?

Decanting is a process in which a liquid is carefully poured out, leaving the solid behind in the container.

A solid is caught on paper or a membrane while the liquid passes through, this process is called Filtration.

Sublimation is a process in which a solid mixture is heated in which one component transitions directly between solid and gas.

A solvent is added to dissolve only one mixture component and then the liquids are separated, this process is known as distillation.

Learn more about filtration here: https://brainly.com/question/23945157

#SPJ1

The physical separation techniques used are :

Decanting Filtrationsublimationdistillation

What are physical separation techniques ?

Physical Separation techniques are procedures applied for the separation of a mixture of two different states pf matter based on their physical properties. usually solid and liquid mixtures. When a mixture of liquid and solid is separated by carefully pouring out the liquid while leaving the solid behind that separation technique is known as decanting.

Learn more about separation techniques : https://brainly.com/question/10862519

#SPJ1

Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?

Answers

Both have the same molar mass

What volume of nitrogen reacts with 33.6 litres of oxygen to produce nitrogen dioxide?​

Answers

N_2+2O_2—⟩2NO_2

1 mol of every gas weighs 22.4L at STP

So

Moles of oxygen

33.6/22.4=1.5mol

1 mol Nitrogen required for 2 mol O_2

0.5 mol N_2 required for 1 mol O_2

Moles of Nitrogen

0.5(1.5)0.75mol

Volume

22.4(0.75)16.8L

Consider the reaction is taking place at standard temperature and pressure. Then 22.4 L reacts with 44.8 L of oxygen. Thus, 33.6 L of oxygen needs 16.8 L of nitrogen.

What is STP condition?

The condition of STP is the standard temperature and pressure. The temperature of 298 K and  pressure of 1 atm is called the standard condition.

At STP the volume of every substance is 22.4 L. The reaction of  nitrogen and oxygen forming nitrogen dioxide is given below:

[tex]\rm N_{2} + 2O _{2} \rightarrow 2 NO_{2}[/tex]

As per this reaction, 22.4 L of nitrogen reacts with  (2 × 22.4) = 44.8 L of oxygen. Hence, the volume of nitrogen required by 33.6 L of oxygen is calculated as follows:

(33.6 L × 22.4 L) / 44.8 L = 16.8 L

Therefore, the volume of nitrogen required to react with 33.6 L  of oxygen is 16.8 L.

To find more on STP condition, refer here:

https://brainly.com/question/10307303

#SPJ2

In the photo
Pls pls pls pls pls pls pls pls pls pls

Answers

A rock resting on the top of a hill has POTENTIAL energy, while a rock rolling down a hill has KINETIC energy.


When an object has potential energy, it means that the object has pent up energy that isn’t being used yet. It is about to do something, but it is at the climax and hasn’t done it yet. For example, if you’re winding up your arm, ready to throw a ball, the energy in the ball isn’t released yet. But, if you were to throw it, it now has kinetic energy.

Kinetic energy happens when an object is in motion. While it is moving, it releases kinetic energy, like my ball example.

Hope this helps! :)

The correct answers are Potential and Kinetic energy.

What are potential energy and examples?

An object can store energy as a result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as a result of its position.

What is kinetic energy?

Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.

Learn more about Energy at https://brainly.com/question/13881533

#SPJ2

Besides water, which of the following compounds are found most in sea water?

sodium bromide
sodium chloride
hydrogen chloride
magnesium chloride

Answers

The answer is sodium chloride.

Explanation:

Sodium chloride refers to table salt, and is the most abundant of salts found in seawater.

A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder?

Answers

The number of molecules of oxygen in the cylinder is 6.02×1023 molecules

Data obtained from the question

Number of mole of oxygen = 1 mole

Number of molecule of oxygen =?

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×1023 molecules. This implies that 1 mole of oxygen contains 6.02×1023 molecules.

Since the cylinder contains 1 mole of oxygen, then the number of molecules of oxygen present in the cylinder is 6.02×1023 molecules.

Which volume of ethane gas, in cm3 , will produce 40cm3 of carbon dioxide gas when mixed with 140cm3 of oxygen gas, assuming the reaction goes to completion

Answers

The volume of ethane gas, C₂H₆ in cm³ that will react to produce 40 cm³ of CO₂ is 20 cm³

Balanced equation

2C₂H₆ + 7O₂ —> 4CO₂ + 6H₂O

From the balanced equation above,

4 cm³ of CO₂ were obtained from 2 cm³ of C₂H₆

How to determine the volume of C₂H₆ needed

From the balanced equation above,

4 cm³ of CO₂ were obtained from 2 cm³ of C₂H₆

Therefore,

40 cm³ of CO₂ will be obtain from = (40 × 2) / 4 = 20 cm³ of C₂H₆

Thus, 20 cm³ of C₂H₆ are required for the reaction.

Learn more about stoichiometry:

https://brainly.com/question/14735801

#SPJ1


how much liquid is needed to prepare 629.5ml of a solution that has a new concentration of 14.3m if the stock solution is 25.2m?

Answers

Answer:

Right if you think it is.

Other Questions
How did Genghis Khan treat many of the people he conquered?He allowed conquered people to govern themselves as long as they stayed loyal to him.He required conquered people to send him soldiers and supplies to grow the empire.He sent his sons to conquered cities to make sure the people were staying loyal.He required conquered people to give up their cultures and languages and become Mongols. Given the function f(x) = x 1, evaluate f(-12). Element X is a radioactive isotope such that every 26 years, its mass decreases by half. Given that the initial mass of a sample of Element X is 680 grams, how much of the element would remain after 19 years, to the nearest whole number? Garcia Manufacturing uses activity-based costing. It budgets $6,644,000 of overhead cost to dispose of 15,100 tons of hazardous waste. The activity rate for hazardous waste disposal based on tons of hazardous waste is: This set of points is on the graph of a function.{(-3, 9), (-1, 1), (0, 0), (2, 4)}Which points are on the graph of the inverse?Select each correct answer.(-9, 3)(1, 1)(4,2)(0, 0) Use the following math quiz scores to answer the questions. 85%, 65%, 87%, 68%, 90%, 73%, 65%, 85%, 95%, 85% 17) What is the mean of these scores? 18) What is the median score? The point on the scale that divides the distribution of scores in half 19) What is the mode of these scores? The value that occurs most frequently in a set. 20) What is the range of these scores? The difference between the lowest and highest values Discuss the importance of federali . is Using "I" messages is a part of ADVOCACY. * Find the surface area of the square pyramid. Enter your answer in the box.A square pyramid. The side length of the base is 11 centimeters. The height of each of the 4 triangular faces is 10 centimeters. cm2 Listen to the audio and then answer the following question. Feel free to listen to the audio as many times as necessary before answering the question.What will the speakers most likely do next?llamar por telfonopreguntar a su familiapreguntar a sus amigasbuscar en la pgina web de Teresa The estimated distribution (in millions) of the population by age in a certain country for the year 2015 is shown in thepie chart. Make a frequency distribution for the data. Then use the table to estimate the sample mean and thesample standard deviation of the data set. Use 70 as the midpoint for "65 years and over."The sample mean is x- (Round to two decimal places as needed.)Under 4 years: 24.815-14 years: 42215-19 years 19420-24 years: 25625-34 years 50.735-44 years: 35.745-64 years 75.265 years and over 54.3 What is "universal suffrage"? No Im sorry not for the last time you had what is the half life of a radioactive sample if 100.0 grams of it decays to 12.5 grams in 24.3 hours He said to me " why are you so lazy "? . Change in into indirect Helpppp asap : two non-vertical lines are parallel if they have the same slope and different y-intercepts. true false Answer question 6 for me thanks Based on what you've read, answer the following questions.Learning has to do with a change in _____________.The name most closely associated with _____________ conditioning is Ivan Pavlov.According to Ivan Pavlov, reflexes cant be learned, but they can be _____________.On a day when you wore your favorite pair of sneakers, your dog was seriously injured in a car accident. Now you dont wear those shoes any more. This situation is an example of _____________.A behavior that produces a result is called a/an _____________.According to operant conditioning, the most powerful secondary reinforcer in our society is _____________.You might use _____________ training to gain control over body processes that are normally automatic, such as your heart rate or the level of muscle tension in your upper back.Describe Pavlovs experiment and its result.Whats the basic difference between classical and operant conditioning? The chemical energy of coal and gas is being used up and cannot be renewed. TRUE OR FALSE Which statement best describes China during the Warring States period