help with this........

Help With This........

Answers

Answer 1
A, I’m not sure if it’s correct tho

Related Questions

Someone help me please?

Answers

C. THERE YA GOOOOOII lol

What dose the T-cell attack

Answers

Answer:

killer T-cell find and destroy infected cells that have been turned into virus-making factories

HELLLPPPPPP PLSSSSSSS!!!!

Answers



solid: definite shape and definite volume.

liquid: changing shape and definite volume.

gas: changing shape and changing volume.

hope this helps!!

4. If 52.0 g of magnesium react with excess hydrochloric acid, how many liters of hydrogen gas can be made at 300 K and 0.970 atm?

Answers

Answer:  54.8 Liters of hydrogen gas can be made at 300 K and 0.970 atm

Explanation:

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]

[tex]\text {moles of magnesium }=\frac{52.0g}{24g/mol}=2.16moles[/tex]

The balanced chemical equation is:

[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]

According to stoichiometry:

1 mole of Mg gives = 1 mole of [tex]H_2[/tex]

Thus 2.16 moles of Mg give = [tex]\frac{1}{1}\times 21.6=2.16 moles[/tex] of [tex]H_2[/tex]

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 0.970 atm

V = Volume of gas = ?

n = number of moles = 2.16

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]300K[/tex]

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{2.16mol\times 0.0821Latm/Kmol\times 300K}{0.970atm}=54.8L[/tex]

Thus 54.8 Liters of hydrogen gas can be made at 300 K and 0.970 atm

What force pulls the water down hill in a watershed, preventing it from going
OVER the drainage divide? *

Answers

Answer:

gravity

Explanation:

force downward due to gravity

Answer:

Gravity is the answer.

Acid rain due to air pollution when water reacts with sulfur dioxide, nitric oxide, and carbon dioxide, causes

Answers

Answer:

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

Explanation:

what evidence led to the development of the cell theory

A.scientists using microscopes

B.scientists watching bacteria divide

C.scientists seeing organelles inside cells

D.scientists reading a lot of books about cells

Answers

C is the answer To the question

Contains a nonmetal and metal

A) base

B) acid

C) covalent bond

D) salt

Answers

Salt - Na Cl
Sodium(metal) and chloride(nonmetal)

What is the volume of a gas if the gas has a volume of 100.0 L at 135 C. What is the volume of the gas if its temperature decreases to 72.0 C

Answers

Answer: The volume of gas is 84.6 L at [tex]72.6^0C[/tex]

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

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

where,

[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.

[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.

We are given:

[tex]V_1=100.0L\\T_1=135^oC=(135+273)K=408K\\V_2=?\\T_2=72.0^0C=(72.0+273)K=345K[/tex]

Putting values in above equation, we get:

[tex]\frac{100.0L}{408K}=\frac{V_2}{345K}\\\\V_2=84.6L[/tex]

Thus the volume of gas is 84.6 L at [tex]72.6^0C[/tex]

How does energy from the Sun drive the cycling of matter?

Answers

Answer:

solar energy drives the cycle by evaporating water from the oceans, lakes, rivers, and soil. As liquid water evaporates or transpires, it forms water vapor and clouds, where water droplets eventually gain enough mass to fall back to Earth as precipitation.

A photon with a wavelength of 397nm is emitted from an electron in energy level 7 of a Hydrogen atom. What is the new energy level of the electron?

Answers

Answer:

New energy level is n = 2

Explanation:

ΔE = energy released by e⁻ transition n = 7 to n(final) = - h·c/λ

h = Planck's Constant = 6.63 x 10⁻³⁴ j·s

c = speed of light in vacuum = 3 x 10⁸ m/s

λ = wavelength = 397 nm = 3.97 x 10⁻⁷ m

ΔE = - (6.63 x 10⁻³⁴j·s )(3 x 10⁸ m/s)/(3.97 x 10⁻⁷ m) = - 5.01 x 10⁻¹⁹ joule

Note: this is the transitional energy 'released' by the electron moving from n = 7 energy level to n(final) energy level. As released energy, the system should be represented by an exothermic process hence, the negative value for ΔE = - h·c/λ. The equivalent amount of energy is an absorption of electromagnetic energy (EMR) to promote the electron from n(final) to n = 7 and this would be endothermic as noted with a +h·c/λ .

The Bohr Model of the electron behavior postulates electron transitions by the release of a 'discrete' amount of EMR as emission spectra defined by the expression ...

ΔE = E(final) - E(initial) => E(final) = ΔE + E(initial)

E(n) = positional (potential) energy content of electron while in energy level n and is defined by the expression E(n) = -R(H)/n²

R(H) = Rydberg Constant = 2.18 x 10⁻¹⁸ joules

n = positional energy level (in this case) = 7

E₇ = -2.18 x 10⁻¹⁸ j / (7)² = -4.45 x 10⁻²⁰ j (potential energy of n = 7 electron)

E(final) = ΔE + E₇ = (-5.01 x 10⁻¹⁹ j)  + (-4.45 x 10⁻²⁰ j) = -4.455 x 10⁻¹⁹ j

E(final) = -R(H)/n²

=> n = SqrRt[R(H)/E(final)] = SqrRt[(-2.18 x 10⁻¹⁸ j)/(-4.455 x 10⁻¹⁹)] ≅ 2

New energy level is n = 2

Which step(s) of the greenhouse effect are being most affected by the increases in greenhouse gases, leading to an increase in heat? 1. Solar radiation enters the Earth system and is reflected and absorbed. 2. Absorbed energy is released into the atmosphere as heat. 3. Heat is absorbed by the atmosphere. 4. The atmosphere re-releases heat, warming Earth's surface and lower atmosphere. 1 and 2 2, 3 and 4 1, 2, and 3 3 and 4

Answers

Answer:

Answers of the greenhouse effect 1 ,3 and 4

Which One Is the Wrong One?

Answers

Answer:

I would say the second one it's the wrong

What effect does the addition of a catalyst have on a chemical reaction at equilibrium?
A.
It increases the rate of the forward reaction, only.
B.
It increases the rate of the reverse reaction, only.
C.
It increases the rate of both the forward and reverse reactions.
D.
It decreases the rate of both the forward and reverse reactions.

Answers

Answer:

C

Explanation:

In the presence of a catalyst, both the forward and reverse reaction rates will speed up equally. :)

How can a chemical reaction be sped up? Select from the drop-down menu to correctly complete the statement. Add a Choose... that is unaffected by a reaction. the choices are, A: catalyst B: coefficient C: product

Answers

Answer:

A: catalyst

Explanation:

In Chemistry, the rate of reaction of chemical elements (reactants) can be sped to produce a chemical compound or elements (products), through the addition of a catalyst that is unaffected by the reaction.

This ultimately implies that, to speed up a chemical reaction, add a catalyst that is unaffected by a reaction.

For example, an enzyme refers to a biological catalyst that is typically used to speed up (accelerate) the rate of a chemical reaction by lowering the activation energy of its reactants.

An enzyme can be defined as a biological catalyst that typically lowers the activation energy of a biological reaction. When the activation energy of a reaction is low, the rate of the reaction would be faster. Therefore, an enzyme speeds or catalyzes the rate of a reaction by lowering its activation energy.

Generally, an increase in temperature increases or speeds up the rate of a reaction while low temperature limits or reduces the rate of a reaction. The optimal temperature for enzymes in the human body is around 37 degrees celsius.

which two things cause the orbits of the planets to be the nearby circular
Inertia
gravity
electricity
magnetism

Answers

Answer:Gravity and inertia

Color blindness is a sex-linked, _______ trait.
-recesive
-dominat
-multiple allele
-multiple dominance

Answers

Answer:

recessive trait

Answer:

recessive

Explanation:

Color blindness is a sex-linked, recessive trait.

hope this helps and is right :)

What does a base release when it is placed in water?
Select one:
a.Chloride ion (Cl-)
b.Hydronium ion (H3O+)
c.Calcium ion (Ca2+)
d.Hydroxide ion (OH-)

Answers

Answer:

D - Hydroxide Ion (OH-)

Explanation:

A base provides either hydroxide ions (OH–) or other negatively charged ions that combine with hydrogen ions, reducing their concentration in the solution and thereby raising the pH. In cases where the base releases hydroxide ions, these ions bind to free hydrogen ions, generating new water molecules.

what is the molarity of a solution in which 10.0 g of AgNO3 is dissolved in 5 L of a solution

Answers

Answer:

no of moles = given mass/molar mass

no of moles = 10/169.87 =0.058moles

molarity = number of moles of solute/volume of solution in litre

molarity = 0.058/5

molarity = 0.0116

During the formation of the sun, gravity pulled matter closer and closer
together until what event occurred?

A. Radioactive decay began.

B. Nuclear fusion reactions began.

C.Neutrons and protons formed.

D. A nebula exploded.

Answers

Answer:

c

Explanation:

cuz

Which solute, an electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each
solute is dissolved in the same mass of water?
O The nonelectrolyte does because it disperses into molecules.
O The electrolyte does because it disperses into molecules.
O The nonelectrolyte does because it dissociates into ions.
O The electrolyte does because it dissociates into ions.

Answers

The solute wether electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water The nonelectrolyte does because it dissociates into ions.

What is a solute?

Solute refers to substances or liquid which can readily dissolve in a solvent. It's concentration is lower to that of solvent.

Therefore, The solute wether electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water The nonelectrolyte does because it dissociates into ions

Learn more about solute below.

https://brainly.com/question/16083884

#SPJ2

Answer:

D: The electrolyte does because it dissociates into ions.

Explanation:

A gas occupies 800ml at a temperature of 27C. What is the volume at 132C?

Answers


V
1

/T
1

=V
2

/T
2


(900.0 mL) / (300.0 K) = (x) / (405.0 K); x = 1215 mL.

Change the 900 to 800, and the 300 to 27, then change the 405 to 132. And solve

______________________________ is the attraction amongst molecules that are dissimilar.

A.) Transpiration
B.) Cohesion
C.) Adhesion
D.) Polarity

Answers

Answer:

ily

Explanation:


Tides are the result of forces exerted on Earth's oceans, mostly by which celestial body?
The Sun
Jupiter
The Moon
Venus

Answers

The answr is the moon

Answer:

Explanation:

The moon

help please and show work!

Answers

Answer:

Mg + 2HCl → MgCl2 + H2

Explanation:

Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2

if people are blind can they dream

Answers

Answer:

yeah they dream in weird shapes mostly I think. unless they weren't born blind then they dream normally I think

Answer:

Kind of, our dreams refer to what we see, but blind people can't see, they might have dreams what the world might look like

The scientist who wrote the universal law of gravitation was

Answers

The scientist who wrote the universal law of gravitation was Sir Isaac Newton.

The scientist that wrote the universal law of gravitation was Isaac Newton.

What is the universal law of gravitation?

The universal law of gravitation states that every object in this universe attracts every other object around it with a force, whose magnitude is directly proportional to the product of their masses and indirectly proportional to the square of the distance between them.

The universal law of gravitation was first published by the scientist Issac Newton in the year 1687.

Learn more about force here:

https://brainly.com/question/30236242

#SPJ6

Which of the following best describes the location of an element in the same period as the element tin?
A. Group 14(4A), Period 4
B. Group 16(6A), Period 5
C. Group 14(4A), Period 5
D. Group 13(3A), Period 6

Answers

Answer:

b

sorry if wrong

Explanation:

C time
2. An instrument used to measure force is
B. spring balance
A ruler
D) wind vane
C. thermometer
of ford​

Answers

Answer:

B. Spring balance - a device used for measuring the weight or force of gravity acting on an object.

Explanation:

A Force is any interaction that changes the motion or position of an obkpjectbthatbit is interacting with. Whenever there is an interaction between two objects, there is a force exerted by each of the objects on one themselves.

Forces are generally divided into contact forces and non-contact over field forces.

In contact forces, the two objects physically in contact with each other. Examples of contact forces are push or pull forces, frictional forces, tensional forces, spring forces, etc.

Non-contact forces are forces in which the two objects interacting do no need to be physically in contact with one another. Examples include, gravitational forces, magnetic forces, electrical forces, etc.

Instruments used in measuring forces are known as force gauges.

From the instruments listed above:

A. A ruler is an instrument used in measuring length

B. Spring balance is a device used for measuring the weight or force of gravity acting on an object.

C. A thermometer is an instrument used in measuring temperature

D. A windbvane is an instrument used in measuring wind direction.

Copper extraction symbol equation

Answers

Answer:

Fe(s) + Cu2+(aq) ===> Fe2+(aq) + Cu(s)

Answer:

2CuFeS2+2SiO2+4O2→Cu2S+2FeSiO3+3SO2(1)

Explanation:

2CuFeS2+2SiO2+4O2→Cu2S+2FeSiO3+3SO2(1)

Other Questions
Fruiting Bodies of Fungi The recognizable forms of fungal reproductive bodies, or fruiting bodies, encountered in nature vary structurally. Common forms of fungal fruiting bodies include trumpet, club fungus, bracket, cup fungus, gill fungus, bolete, puff ball, and stinkhorn. Close observation of fruiting body anatomy can lend clues during identification of a species. Differing species of fungi can appear similar, and it is never advised to eat a wild mushroom because poisonous varieties can resemble edible ones. 1. Fungal fruiting bodies, or reproductive bodies, have different structural forms.a. trueb. false2. Many experiments require student-supplied items, such as _____. I really need help with this solve the equation t^3=-343 The statement below is from Executive Order 10924, President John F. Kennedy, March 1, 1961. The Peace Corps shall be responsible forthe training and service abroad of menand women of the United States in newprograms of assistance to nations andareas of the world, and in conjunctionwithother international organizations. What opportunities does the executive order create for citizens and the government? A.to provide for the common defenseB.to establish domestic tranquilityC.to advance the common goodD.to administer justice ASAP PLEASE AND THANK YOU What is the molar mass of a pure gas that has the density of 1.40 g/L at STP? Please read everything and put ur answers below.. Im a new student from class and no one wants to be friends with me, lol is it okay if we be friends by the way? we could help each others work like this! :) ty n have a great day! If the demand for skateboards decreases, you can expect the price of skateboards to: A) increase B) triple C) not change D) decrease Help!!! The graph represents (x , y)- pairs that make the equation y = 2x true? Last month, a sporting goods store sold a total of 100 T-shirts and running shorts. The number of T-shirts sold was 10 more than twice the number of running shorts sold. How many T-shirts and running shorts did the store sell separately? A. T-shirts: 30, Running shorts: 70 B. T-shirts: 45, Running shorts: 55 C. T-shirts: 55, Running shorts: 45 D. T-shirts: 70, Running shorts: 30 After graduation, you face a choice. You can work for a multinational consulting firm and earn a starting salary (including benefits) of $40,000, or you can start your own consulting firm using $5,000 of your own savings. If you keep your money in a savings account, you can earn an interest rate of 7 percent. You choose to start your own consulting firm. At the end of the first year, you add up all of your expenses and revenues. Your expenses include $14,000 for rent, $1,000 for office supplies, $24,000 for labor, and $4,500 for telephone expenses. After operating your consulting firm for a year, your total revenues are $88,000.Required:What are your total explicit cost and total implicit costs? please help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! what's 3 more then x is 5 FOR SAT HELPP!!! Each length of the side of square B is twice the length of the side of square A.John says that this means the area of square B is twice the area of square A.Is John right?Justify your answer. HelpppppppppppppppoooppppppPsnsndnnddnjdjd Find the lateral area of the cylinder. Evaluate the expression shown below and write your answer as a fraction in simplest form 2/9 - 11/15Plz solve asap b. Simplify: (x + a)2 + (x - a)2 Calculate the area of the shapes below.2.8 ft4 ft12 ftPlease LOL A NOW account requires a minimum balance of $750 for interest to be earned at an annual rate of 4 percent. An account holder has maintained an average balance of $500 for the first six months and $1,000 for the remaining six months. The account holder writes an average of 60 checks per month and pays $0.02 per check, although it costs the bank $0.05 to clear a check.Required:a. What average return does the account holder earn on the account? b. What is the average return if the bank lowers the minimum balance to $400? c. What is the average return if the bank pays interest only on the amount in excess of $400? Assume that the minimum required balance is $400. d. How much should the bank increase its check fee to the account holder to ensure that the average interest it pays on this account is 5 percent? Assume that the minimum required balance is $750. Direct Materials Variances The following data relate to the direct materials cost for the production of 20,000 automobile tires: Actual: 80,000 lbs. at $2.65 $212,000 Standard: 86,000 lbs. at $2.50 $215,000 a. Determine the direct materials price variance, direct materials quantity variance, and total direct materials cost variance. Enter favorable variances as negative numbers. Enter unfavorable variances as positive numbers. Price variance $fill in the blank 1 Quantity variance fill in the blank 3 Total direct materials cost variance $fill in the blank 5 b. The direct materials price variance should normally be reported to the . The direct materials quantity variance due to a malfunction of equipment that had not been properly operated should be reported to the . The total materials cost variance should be reported to the .