True or False: The dots are placed as
far apart as possible because they
represent electrons, with the same
negative charge, that repel each

Answers

Answer 1

Answer: True

Explanation:


Related Questions

If is known how deep the water table in an area is, it is known how deep to dig to reach


Pores

The unsaturated zone

Solid rock

Groundwater

Answers

Answer:
Groundwater

Explanation:
Groundwater is really soft to go through as sand.

Answer:

grond water

Explanation:

If the temperature of a gas decreases at constant volume which of the following would occur

Answers

Answer:

I need the things after "which of the following would occur".

Explanation:

If you were to maintain a constant volume while decreasing pressure, the temperature would also have to decrease. This is Boyle's law.

A student observes the chemical process described by this equation:

4Al + 3O2 → 2Al2O3

How does the mass of the new substance compare to the total mass of the starting materials?

Answers

Answer:

Both are equal

Explanation:

Mass of starting material i.e Aluminium is [tex]4.480 * 10^{-23}[/tex] grams

The weight of oxygen is [tex]2.65 * 10^{-23}[/tex]

There are 4 atoms of aluminium and 3 atoms of oxygen

Thus, the total mass of starting material is

[tex]4 *[/tex] mass of one atom of aluminium [tex]+ 6 *[/tex] mass of one atom of oxygen

[tex]4 * 4.480 * 10^{-23} + 6* 2.65 * 10^{-23}[/tex]

[tex]35.1 * 10^{-23}[/tex] grams

Mass of new substance is also equal to

[tex]4 *[/tex] mass of one atom of aluminium [tex]+ 6 *[/tex] mass of one atom of oxygen

[tex]4 * 4.480 * 10^{-23} + 6* 2.65 * 10^{-23}[/tex]

[tex]35.1 * 10^{-23}[/tex] grams

What name is given to any chemical which increase the rate of a chemical reaction

Answers

Answer:

It is called catalyst.

Answer:

A catalyst

Explanation:

is a substance that can alter the rate of a chemical reaction. Catalysts can be successfully used to increase the rate of a chemical reaction.

When a substance changes from a liquid to a solid, it has reached its _____ point

Answers

Answer:

The temperature at which a substance changes from the liq- uid state to the solid state is called the freezing point. The freez- ing point of the liquid state of a substance is the same temperature as the melting point of the solid state. For example, solid water melts at 0°C and liquid water freezes at 0°C.

Explanation:

what is the shortest half life

Answers

Answer:

Hey!

Your answer is element A

Explanation:

Using the graph, the element A's emission of radioactive particles ends approximately after 6 years...

A HALF-LIFE IS "HALF" OF THAT TIME PERIOD!

So if the radiation goes for 6 years the half-life is 6 divided by two which gives you 3 years!

The rest however have a longer half-life...

Because they all end at 14 yrs so their half-life in 7 years!

HOPE THIS HELPS!!

Students are comparing the physical properties of sugar water, salt water,and plain water,including the affects of thermal energy. What safety equipment is needed?

A-Graduated Cylinder and gloves
B-safety goggles and thermometer
C-thermometer and hot plate
D-safety goggles and gloves

Answers

im pretty sure its D, every science class ever had the rules that you had to have saftey goggles and gloves in order to do ANY lab.

Answer:

D

Explanation:

The safety equipment that is needed when your doing a science experiment you need a safety goggles and gloves.

Correct name of the compound

Answers

Answer:

Calcium Nitride

Explanation:

If the mole fraction of sulfuric acid H2SO4 is 0.432 what is the percent by mass of H2SO4.

Answers

Answer:

19.47%

Explanation:

The percentage by mass of [tex]H_2SO_4[/tex] would be 19.47%.

The percentage by mass of a substance in solution is calculated as:

   [tex]\frac{mass of substance}{mass of substance + water} * 100%[/tex]

Given that the mole fraction of [tex]H_2SO_4[/tex] = 0.432

The total number of mole fraction of a solution = 1

Hence, mole fraction of water = 1 - 0.432 = 0.568

Mass of water = molar mass x mole

                              = 98.079 x 0.432 = 42.37 g

Mass of [tex]H_2SO_4[/tex] = molar mass x mole

                          = 18.02 x 0.568 = 10.24 g

Hence,

%mass of [tex]H_2SO_4[/tex] = [tex]\frac{10.24}{10.24 + 42.37} * 100[/tex]

                         = 19.47%

Blast furnaces extra pure iron from the Iron(IIl)oxide in iron ore in a two step sequence. In the first step, carbon and oxygen react to form carbon monoxide:
2C(s)+O2(g) arrow 2CO(g)
In the second step, iron(lll) oxide and carbon monoxide react to form Iron and carbon dioxide:
Fe203(s) + 3CO(g) arrow 2Fe(s)+ 3CO2(g)
Suppose the yield of the first step is 71.% and the yield of the second step is 72.%. Calculate the mass of oxygen required to make 7.0 kg of iron.
Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.

Answers

Answer:

5.9 kg  

Explanation:

We must work backwards from the second step to work out the mass of oxygen.

1. Second step

Mᵣ:                                     55.84

            Fe₂O₃ + 3CO  ⟶  2Fe  +  3CO₂

m/kg:                                    7.0

(a) Moles of Fe

[tex]\text{Moles of FeO} = \text{7000 g Fe} \times \dfrac{\text{1 mol Fe}}{\text{55.84 g Fe}} = \text{125 mol Fe}[/tex]

(b) Moles of CO

[tex]\text{Moles of CO} = \text{125 mol Fe} \times \dfrac{\text{3 mol CO}}{\text{2 mol Fe}} = \text{188 mol CO}[/tex]

However, this is the theoretical yield.

The actual yield is 72. %.

We need more CO and Fe₂O₃ to get the theoretical yield of Fe.

(c) Percent yield

[tex]\begin{array}{rcl}\text{Percent yield} &=& \dfrac{\text{ actual yield}}{\text{ theoretical yield}} \times 100 \, \%\\\\ 72. \, \% & = & \dfrac{\text{188 mol}}{\text{actual yield}} \times 100 \,\%\\\\0.72 &= &\dfrac{\text{188 mol}}{\text{actual yield}}\\\\\text{Actual yield} & = & \dfrac{\text{188 mol}}{0.72}\\& = & \textbf{261 mol}\\\\\end{array}[/tex]

We must use 261 mol of CO to get 7.0 kg of Fe.

2. First step

Mᵣ:                32.00

            2C   +  O₂   ⟶  2CO

n/mol:                             261

(a) Moles of O₂

[tex]\text{Moles of O}_{2} = \text{261 mol CO} \times \dfrac{\text{1 mol O}_{2}}{\text{2 mol CO}} = \text{131 mol O}_{2}[/tex]

(b) Mass of O₂

[tex]\text{Mass of O}_{2}= \text{131 mol O }_{2} \times \dfrac{\text{32.00 g O}_{2}}{\text{1 mol O}_{2}} = \text{4180 g O}_{2}[/tex]

However, this is the theoretical yield.

The actual yield is 71. %.

We need more C and O₂ to get the theoretical yield of CO.

(c) Percent yield

[tex]\begin{array}{rcl}71. \, \% & = & \dfrac{\text{188 mol}}{\text{actual yield}} \times 100 \,\%\\\\0.71 &= &\dfrac{\text{4180 g}}{\text{actual yield}}\\\\\text{Actual yield} & = & \dfrac{\text{4180 g}}{0.71}\\\\& = & \text{5900 g}\\& = & \textbf{5.9 kg}\\\end{array}[/tex]

We need 5.9 kg of O₂ to produce 7.0 kg of Fe.

What was the purpose of the Apollo space missions?

to collect rock samples from Mars

to land on Saturn

to collect rock samples from the moon

to land on Jupiter

Answers

Answer:

i agree with the above to collect rock samples

Explanation:

took test got 100 best of luck

The  purpose of the Apollo space missions was to to collect rock samples from the moon.

What is moon?

The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of Australia).The Moon is a planetary-mass object with a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term and larger than all known dwarf planets of the Solar System.

It lacks any significant atmosphere, hydrosphere, or magnetic field. Its surface gravity is about one-sixth of Earth's at 0.1654 g, with Jupiter's moon Io being the only satellite in the Solar System known to have a higher surface gravity and density.

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The strong nuclear force is always smaller than the electrostatic force true or false

Answers

Answer:

False

Explanation:

The Strong Nuclear Force is defined as an attractive force between neutrons and protons which is responsible to hold the nucleus together.

Electrostatic force is the repulsive or attractive force between two electrically charged objects.

Strong nuclear force is always greater than electrostatic force but changes with the distance. Strong nuclear attraction keeps the nucleus of an atom together in a small space as well which is stronger  than their electrostatic repulsion.

it is said that, the strong nuclear force is the strongest force in the universe.

Hence, the given statement is false.

Answer:

False

Explanation:

Strong nuclear forces are much higher than the electrostatic repulsive force. In case if these strong nuclear forces would have not been there, then the nucleus would have disintegrated. This is so because only gravity cannot keep hold on these particles. The nuclear force varies with the size of nucleus. As the size of nucleus increases, the electrostatic repulsion becomes greater

Hence, the given statement is false

PLEASE HELP :)

which type of reaction is shown in the diagram

a. fusion, because the reaction released energy?

b.fission, because the reaction absorbed energy

c.fusion, because the reaction formed lighter nuclei

d.fission,because the reaction formed heavier nuclei

Answers

Answer:

b.fission, because the reaction absorbed energy

Explanation:

The reaction is shown in the diagram is fission. because the reaction absorbed energy. Therefore, option B is correct.

What is fission ?

The process of nuclear fission involves the splitting of an atom's nucleus into two or more smaller nuclei. Even by the energetic standards of radioactive decay, the fission process releases a very high quantity of energy and frequently results in gamma photons.

By dissolving large, heavy atoms, like uranium, into smaller ones, like iodine, caesium, strontium, xenon, and barium, to name just a few, fission produces energy. However, fusion involves joining light atoms, such as the deuterium and tritium isotopes of hydrogen, to create the heavier helium.

Nuclear fission is used by all nuclear power plants, and uranium atoms are typically used in nuclear power plants. A neutron splits a uranium atom when it collides with it during nuclear fission, releasing a significant quantity of energy.

Thus, option B is correct.

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What are all of the possible products of the electrolysis of Sodium Chloride in aqueous solution of water when the electrodes are made of copper?

A photo has been provided to show what is happening

Answers

Answer:

HDHERFEHFFFHRF

Explanation:

According to Reference Table Adv-8, which of the following is the strongest Brönsted-Lowry acid?
1.HS-
2.H2S
3.HNO2
4.HNO3​

Answers

Answer:

HNO3

Explanation:

The ability of an acid to act as a Brownstead-Lowry acid depends on it's proton donation ability.

A Brownstead-Lowry acid is a specie that donates hydrogen ions in solution.

Considering all the chemical species listed among the options, HNO3 has the greatest hydrogen donation ability. It then follows that HNO3 is the strongest Brownstead-Lowry acid among the species listed.

Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?
higher temperature → more kinetic energy → more space between particles – higher volume
higher temperature → less kinetic energy → less space between particles higher volume
o higher temperature → more kinetic energy → less space between particles → lower volume
higher temperature → less kinetic energy → more space between particles lower volume

Answers

Answer:

higher temperature → less kinetic energy → less space between particles higher volume

Explanation:

A student investigates a pure metal, X. The student takes a 100.0 g piece of metal X, heats it
to 500.0°C, then places it on a 1000.0 g block of ice at 0.0°C. The ice partially melts, and
the final temperature of the metal, ice, and melted water is 0.0°C. The student calculates the
experimental value of the specific heat capacity of metal X and records it as
0.90 J/(g • °C).
(C) Calculate the magnitude of the energy change of metal X during the experiment.
(d) Calculate the mass of ice melted by metal X. (The enthalpy of fusion of ice is 330J/g.
(e) A student claims that the energy transferred to the ice breaks the polar-covalent O-H
bonds found between atoms within water molecules. Do you agree or disagree with this
claim? Justify your answer.

Answers

Answer: The answer would be D

Explanation:

The magnitude of the energy change of metal X during the experiment is 6500 J, and the mass of ice melted by metal X is 19.7 g and the claim of the student is correct.

What are changes in ice?

The magnitude of energy change of metal is equal to the mass of metal x specific heat capacity of metal x temp. difference

= 100 g x 0.13 J / ( g- oC) x (500 - 0) oC

= 6500 J

According to the question, the enthalpy of the fusion of ice is 330 J / g

Thus 330 J heat is used to melt 1 g of ice

So 6500 J heat is used to melt = 1 x (6500 / 330) = 19.7 g ice

Although hydrogen bonds can form in both a solid and a liquid state, they are more stronger in the solid state. In order to partially dissolve its hydrogen bonds and turn solid ice into liquid water, whatever heat is applied to it is therefore used.

Therefore, the student's assertion is true.

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11. Calculate the energy required to produce 12.00 mol of CI207 on the basis of the
following balanced equation.
2012(g) + 702(g) + 130 kcal yields 201207(9)

Answers

Answer: 780 kcal are required to produce 12.00 mol of [tex]Cl_2O_7[/tex]

Explanation:

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and written along with reactants.

The balanced chemical reaction is:

[tex]2Cl_2(g)+7O_2(g)+130kcal\rightarrow 2Cl_2O_7(g)[/tex]

According to stoichiometry :

2 moles of [tex]Cl_2O_7[/tex] are produced by absorption of energy = 130 kcal

Thus 12.00 moles of [tex]Cl_2O_7[/tex] are produced by absorption of energy = [tex]\frac{130}{2}\times 12.00=780kcal[/tex]

Thus 780 kcal are required to produce 12.00 mol of [tex]Cl_2O_7[/tex]

Over the past century, the percent of squirrels in the vicinity of Washington, DC, that are black instead of the more common gray has been continually increasing. Which of the following statements best explains why this is happening?

 A. 

Black squirrels are more visible against tree trunks than gray squirrels.

 B. 

Black squirrels are more popular with tourists than gray squirrels.

 C. 

Gray squirrels are more comfortable with humans than black squirrels.

 D. 

Black squirrels have a survival advantage over gray squirrels.​

Answers

It’s D. they do have a survival advantage since they are darker.

26.9 g of solid lithium is combined with 20.0 grams of nitrogen gas. .
When the reaction is complete, an actual yield of 32.5 grams of solid product is produced.
Need to know how to do it, please help me soon!

Answers

Answer:

The theoretical yield of

Li

3

N

is

20.9 g

.

Explanation:

Balanced Equation

6Li(s)

+

N

2

(

g

)

2Li

3

N(s)

In order to determine the theoretical yield, we must first find the limiting reactant (reagent), which will determine the greatest possible amount of product that can be produced.

Molar Masses

Li

:

6.941 g/mol

N

2

:

(

2

×

14.007

g/mol

)

=

28.014 g/mol

Li

3

N

:

(

3

×

6.941

g/mol Li

)

+

(

1

×

14.007

g/mol N

)

=

34.83 g/mol Li

3

N

Limiting Reactant

Divide the mass of each reactant by its molar mass, then multiply times the mole ratio from the balanced equation with the product on top and the reactant on bottom, then multiply times the molar mass of

Li

3

N

.

Lithium

12.5

g Li

×

1

mol Li

6.941

g Li

×

2

mol Li

3

N

6

mol Li

×

34.83

g Li

3

N

1

mol Li

3

N

=

20.9 g Li

3

N

Nitrogen Gas

34.1

g N

2

×

1

mol N

2

28.014

g N

2

×

2

mol Li

3

N

1

mol N

2

×

34.83

g Li

3

N

1

mol Li

3

N

=

84.8 g Li

3

N

Lithium produces less lithium nitride than nitrogen gas. Therefore, the limiting reactant is lithium, and the theoretical yield of lithium nitride is

20.9 g

.

Explanation:

a _____ is substance in which one or more atoms have the same number of protons (I.e. the same atomic number)

Answers

Answer: Element

Explanation:

Answer: a proton is substance in which one or more atoms have the same number of protons

You take a very hot block of metal on top of a cold block of metal. What will
happen to the temperature of both blocks over time?

Answers

Answer:

They will both cool down overtime

Explanation:

Once you put something that is hot on something that is cold. They will both be hot, but overtime they will cool down. It can't stay hot forever.

Answer:

Hey!

Your answer is that one block of metal (the cold one) would heat up a bit whilst the other block (the hot one) would cool down...This is because of the metal's CONDUCTIVITY!

Explanation:

Eventually you would measure the temperature of both blocks and they will reach the same temperature. After this they will naturally cool down...

HOPE THIS HELPS!!

When an electric circuit operates a buzzard makes a sound what happens to the electric charges in the circuit

Answers

Answer:

Explanation:

Khfxgkfxyfkx

CAN SOMEONE HELP PLS!!!

Answers

Answer:

Matals tend to LOSE electrons to become POSITIVE ions

The correct answer is C.

What is the volume of 9.5 g fluorine gas, F2, at STP?

Answers

Answer:

5.6L

Explanation:

At STP, the pressure and temperature of an ideal gas is

P = 1 atm

T = 273.15k

Volume =?

Mass = 9.5g

From ideal gas equation,

PV = nRT

P = pressure

V = volume

n = number of moles

R = ideal gas constant =0.082J/mol.K

T = temperature of the ideal gas

Number of moles = mass / molar mass

Molar mass of F2 = 37.99g/mol

Number of moles = mass / molar mass

Number of moles = 9.5 / 37.99

Number of moles = 0.25moles

PV = nRT

V = nRT/ P

V = (0.25 × 0.082 × 273.15) / 1

V = 5.599L = 5.6L

The volume of the gas is 5.6L

Please help I don’t understand

Answers

(1) Mg(s) underwent oxidation because Mg gained 2 ions.


What happens when light passes from air into water?
A) The light speeds up
B) The light continues at the same speed
C) The light slows down
D) The light forms a mirage

Answers

The answer is C . when the light slows down

Do metals or nonmetals have the greatest tendency to lose electrons and become positive ions?

Answers

Answer:

The metals have the tedency to lose electrons and become positive ions

Explanation:

In order to attain noble gases electronic configuration, metals of group I A lose one electron and II A lose 2 electrons with ionization energy.

Select the correct answer.
Which action reflects irresponsible lab safety behavior?
A.
not wearing goggles when breaking a rock with a hammer
B.
not shaking hands with your lab partner after a successful experiment
C.
not chatting with others while mixing two reactive chemicals
D.
not sharing findings and recordings with the general public
E.
not using scientific tools while making crucial observations

Answers

Answer:

A.  not wearing goggles when breaking a rock with a hammer

Explanation:

You could get extremely hurt if you are not wearing goggles while doing lab work.

The action that reflects irresponsible lab safety behavior is not wearing goggles when breaking a rock with a hammer. Thus, the correct option for this question is A.

What are Lab safety behaviors?

Lab safety behaviors may be defined as those actions and habits that are persistently taken by individuals in order to maintain discipline and safety on their own. Some of the lab safety behaviors are as follows:

Avoid skin and eye contact with all chemicals by wearing gloves and goggles.Follow an accurate protocol during an experiment. Beware of all safety showers, eye washers, and fire extinguishers. Avoid eating, drinking, and unnecessary talking in the lab.Never smell or inhale laboratory chemicals.

Some of the lab safety behaviors also include not shaking hands with your lab partner after a successful experiment, not sharing findings and recordings with the general public, etc. This is because these are some private sources of information.

Therefore, the action that reflects irresponsible lab safety behavior is not wearing goggles when breaking a rock with a hammer. Thus, the correct option for this question is A.

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Which statements correctly describe the rock cycle? Check all that apply.

Rocks are preserved through the process.

Rocks change from one type to another.

Different rock groups are interrelated.

Rocks change from one type to another in a specific order.

Environmental conditions influence a change in rock type.

Answers

Answer: I italicize for checking

Rocks are preserved through the process.Rocks change from one type to another.Different rock groups are interrelated.Rocks change from one type to another in a specific order.Environmental conditions influence a change in rock type.

Explanation:

Rocks are preserved, as in you can't destroy them completely, but no, they don't stay the same they change.

Other Questions
Anderson Steel Company began 2018 with 550,000 shares of common stock outstanding. On March 31, 2018, 140,000 new shares were sold at a price of $50 per share. The market price has risen steadily since that time to a high of $55 per share at December 31. No other changes in shares occurred during 2018, and no securities are outstanding that can become common stock. However, there are two agreements with officers of the company for future issuance of common stock. Both agreements relate to compensation arrangements reached in 2017. The first agreement grants to the company president a right to 42,000 shares of stock each year the closing market price is at least $53. The agreement begins in 2019 and expires in 2022. The second agreement grants to the controller a right to 47,000 shares of stock if she is still with the firm at the end of 2026. Net income for 2018 was $5,200,000. Required: Compute Anderson Steel Company's basic and diluted EPS for the year ended December 31, 2018. (Enter your answers in thousands.) Half of a sphere is stacked on top of a cone. They both share a circular base. The radius of the circle is 6 millimeters. The height of the cone is 14 millimeters.What is the volume of the composite figure? Express the answer in terms of .144 mm3168 mm3312 mm3456 mm3 The identification and analysis of illegal substances such as drugs takes place in the _____.DNA laboratorytoxicology laboratorycourt roomhospital laboratory The Finland woman refuses to give Gerda something to helpher save Kay because she knows thatthere is no way for Kay to be saved.Gerda's strength comes from within herself.the reindeer has to share his powers with Gerda.the Snow-queen must take away the glass splinters fromKay. In which population would reproducing asexually be mostadvantageous?A population living in a changing environment- A population too large for the available resourcesA population heavily hunted by many differenttypes of predatorsA population living successfully in stableenvironmental conditions 1-True or False: Human activities such as nitrogen fertilizer can upset the balance of the nitrogen cycle. TrueFalse 1. The cost to rent a movie is $3 for 1 day,$4 for 2 days, and $5 for 3 days. Describethe relationship between the cost and thenumber of days.2. Kenji plants 8 seeds in 1 row of his garden,16 seeds in 2 rows, and 24 seeds in 3 rows.Describe the relationship between thenumber of rows and the number of seeds. Sara is a drummer in her schools marching band. She wants to make a geometrically similar model of a snare drum for her stuffed animals. To find the dimensions she should use to make a cylinder model with a scale of 1:4, Sara measures the radius and height of a snare drum and multiples each dimensions by 1/2, which statement is true?A. a cylinder with Saras dimensions will be geometrically similar, and scale factor will be 1:4B. A cylinder with Saras dimensions will be geometrically similar, but the scale factor will be 1:2C. a cylinder with Saras dimensions will be geometrically similar, but the scale factor will be 1:8D. a cylinder with saras dimensions will not be geometrically similar Why would interest groups write press releases and create commercials?a. to advertise and sell productsb. to make the public less aware of their causeto avoid making their ideas publicd. to help keep the public informed about issuesC.Please select the best answer from the choices providedA b c d Somebody help Ive tried this question many times and still get it wrong What are different types of dental screenings? can someone help me find the area please? Busca antnimos para las siguietnes palabras en el texto:1. Nos quedamos quietos2. activo3. de pieAlgn5. Antes6. entrar7. aburrirnos8. disminucin It's Quadratic, Exponential or Linear? a circle with circumference 18 had an arc with 120 central angle. what is the length of the arc Dan Bumblauskas is the owner of a small Iowa company that produces electric knives used to cut fabric. The annual demand is for 10 comma 500 knives, and Dan produces the knives in batches. On average, Dan can produce 190 knives per day; during the production process, demand has been about 70 knives per day. The cost to set up the production process is $85, and it costs Dan $1.10 to carry a knife for 1 year. How many knives should Dan produce in each batch? Type the correct answer in the box. Use numerals instead of words.Jim Is assessing the popularity of his high school football team's website for the first 5 weeks after the season ends. The average number of visitson the website for 5 weeks is given in the table below.Number of Weeks Avg. Number of Visits048,000124,000212,00036,00043,0001,50059.The percent decrease in the average number of visits each week since the end of the season was The manager of East India Ice Cream Shop keeps track of the number of customers served at different periods of the day in an attempt to plan a schedule for workers that matches the demand for the restaurant's products. By using this tracking system, the manager of East India is utilizing ________ control. The quantities x and y are proportional.x y2 227 779 99Find the constant of proportionality (r) in the equation: y = rxr = ?Thanks :) How are plastic containers different from paper containers? How are they the same?