please help me I have no idea what this is

Answer:

Grade achieved is the dependent variable in the study.

Explanation:

A variable in any research or study is any property, characteristic, number, or a quantity which shows variability or change in its value i.e. it increases or decreases over time, depending on the treatment conditions.

There are two types of variables: Dependent variable and Independent variable.

An independent variable does not depent on any factor for its value or result, rather, a change units value brings about a change in the dependent variable.

A dependent variable is the variable which depends on some factor which the researcher controls. Any change made on the factor by the researcher would bring about a change on the dependent variable.

For example, in the given example above, studying habit affects academic performance. If a student studies more, his/her academic performance will improve as they will achieve higher grades. On the other hand, if a student fails to study, their academic performance will not show any improvement when compared to the group of students who studied. Thus, grade improvement depends on studying habit.

Therefore, grade obtained is the dependent variable in the study.

Answer:

83 g

Explanation:

Step 1: Write the balanced equation

2 Fe + 3 S ⇒ Fe₂S₃

Step 2: Calculate the moles corresponding to 95 g of Fe

The molar mass of Fe is 55.85 g/mol.

95 g × 1 mol/55.85 g = 1.7 mol

Step 3: Calculate the moles of S needed to react with 1.7 moles of Fe

The molar ratio of Fe to S is 2:3. The moles of S needed are 3/2 × 1.7 mol = 2.6 mol

Step 4: Calculate the mass corresponding to 2.6 moles of S

The molar mass of S is 32.07 g/mol.

2.6 mol × 32.07 g/mol = 83 g

Answer:

a chain of decays that result in a stable nucleus

Explanation:

Decay series is a series of decay in which radioactive element is decomposed in different elements until it produces one stable atom.

Answer:

C

Explanation:

took test Edg

Answer:

2FeBr₃ + 3Na₂S → 1Fe₂S₃ + 6NaBr

Explanation:

SOLUTION :-

Balance the equation by hit & trial method , and you'll get the answer :-

2FeBr₃ + 3Na₂S → 1Fe₂S₃ + 6NaBr

VERIFICATION :-

In the reactant side of the equation :-

In the product side of the equation :-

Number of atoms of all elements are same in both reactant & product side of the equation. Hence , the equation is balanced.

Answer:  g/mol

Explanation:

The gram formula mass of  CuSO 4  is  159.60 g/mol  

Multiply the subscript for each element by its molar mass (atomic mass on periodic table in g/mol). Then add the results. This will give you the molar mass of the compound (mass of 1 mole).

Cu : ( 1 × 63.546 g/mol )   = 63.546 g/mol

S : ( 1 × 32.065 g/mol )      = 32.06 g/mol

O : ( 4× 15.999 g/mol )     =  63.996 g/mol

CuSO 4 :  63.546 g/mol  +  32.06 g/mol  + 63.996 g/mol  = 159.60 g/mol  (rounded to two decimal places)

Answer:

[tex]V_2=18.0L[/tex]

Explanation:

Hello there!

In this case, according to the given information, we infer that we need the combined gas law in order to solve this problem:

[tex]\frac{P_2V_2}{T_2}} =\frac{P_1V_1}{T_1}}[/tex]

Thus, by suing the temperatures in Kelvins, we can solve for the final volume as shown below:

[tex]V_2 =\frac{P_1V_1T_2}{T_1P_2}}\\\\V_2 =\frac{(760mmHg)(22.4L)(232K)}{(273K)(805mmHg)} \\\\V_2=18.0L[/tex]

Regards!

Execute Order 66________________

The mass of LiOH needed to make a 300 mL of a solution with a pH of 11.33 is 0.015 g

We'll begin by calculating the pOH of the solution.

pH = 11.33

pOH =?

pH + pOH = 14

11.33 + pOH = 14

Collect like terms

pOH = 14 – 11.33

pOH = 2.67

pOH = –Log [OH⁻]

2.67 = –Log [OH⁻]

–2.67 = Log [OH⁻]

Take the as antilog of –2.67

[OH⁻] = antilog (–2.67)

LiOH(aq) —> Li⁺(aq) + OH⁻(aq)

From the balanced equation above,

1 mole of LiOH contains 1 mole of OH⁻

Therefore,

0.0021 M LiOH will also contain 0.0021 M OH⁻.

Molarity of LiOH = 0.0021 M

Volume = 300 mL = 300 / 1000 = 0.3 L

Mole = Molarity × volume

Mole of LiOH = 0.0021 × 0.3

Mole of LiOH = 0.00063 mole

Molar mass of LiOH = 7 + 16 + 1 = 24 g/mol

Mass = mole × molar mass

Mass of LiOH = 0.00063 × 24

Therefore, the mass of LiOH needed to prepare the solution is 0.015 g

Learn more: https://brainly.com/question/5851093

Answer:

.

Explanation:

Answer:

The great ocean conveyor plays a highly significant part in the climate of the planet. It transports heat to the Polar Regions, for example. In doing so, the amount of ice that can be formed in these regions is limited.

Answer:

340 grams Ca₃P₂ (2 sig. figs.)

Explanation:

   3Ca     +     2P     =>    Ca₃P₂

5.6 mole + excess =>   ? grams

Convert the 'known' to a coefficient of 1 by dividing all coefficients by 3.

=>  Ca   +   2/3P   =>    1/3Ca₃P₂

From the above, 1 mole of Ca => 1/3 mole Ca₃P₂  

∴ 5.6 mole Ca in an excess of P => 1/3(5.6 mole) Ca₃P₂

=> 1.8666 mol Ca₃P₂ (calculator answer) ≅ 1.9 mol Ca₃P₂

=> 1.9 mole x 182 g Ca₃P₂/mol Ca₃P₂ = 339.73333 grams Ca₃P₂

≅ 340 grams Ca₃P₂ (2 sig. figs.)

Answer:

26.2kPa is the partial pressure of nitrogen

Explanation:

Assuming the partial pressure of Carbon dioxide is 0.070atm

The total pressure of a mixture of 3 gases (CO2, O2 and N2) is:

Total pressure = Partial pressure CO2 + Partial pressure O2 + Partial pressure N2

0.070atm CO2 are:

0.070atm * (760mmHg / 1atm) 53.2mmHg

Replacing:

930mmHg = 53.2mmHg + 680mmHg + Partial pressure N2

Partial Pressure N2 = 196.8mmHg

In kPa -101.325kPa = 760mmHg-

196.8mmHg * (101.325kPa / 760mmHg) =

We are given:

V₁ = 400 mL               T₁ = 75°c = (273+75)K = 348K

V₂ = x mL                    T₂ = 95°c = (273+95)K = 368K

Deriving Boyle's Law:

here, we can see that the volume and temperature are the only variables

from the ideal gas equation:

PV = nRT

T /V = P / nR

because P, n and R are constants, P/nR is a constant value

T / V = constant

which means that the initial and final ratio of P and T will be constant, hence:

T₁ / V₁ = T₂ / V₂, this is also known as the Charles' law. what I did above was it's derivation

Finding final volume:

plugging the given values:

348/400 = 368 / x

x = 368*400 / 348

x = 422.9 mL

Answer: 5 all of the above

Explanation:

A mutation can be a blessing or a curse. It can also have no effect on the person at all.

Hope this helps

1s2,2s2,2p6

Explanation:

electron arrangements

Answer:

I think it's C

Explanation:

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!

Answer: Atomic mass of gallium = 69.72304093 amu

Explanation:

We calculate the atomic mass of Gallium  by  using  the Relative abundance of the isotopes.

Atomic mass =mass x Natural Abundance of Isotope 1  +mass x Natural Abundance of Isotope 2

(60.11/100 x  68.9256) + (39.89/100 x  70.9247)

= 41.43117816 + 28.29186283 = 69.72304093 amu

Answer:

This is because of diffusion , the movement of particles from an area of high concentration to an area of low concentration. ... This means that diffusion does not happen in solids – the particles in a solid can only vibrate and cannot move from place to place.

Answer:

Solids cannot diffuse each other because they are tightly packed and they are rigid and do not have fluidity.

Answer:

"the chemical engineering processes and other facilities used in petroleum refineries to transform crude oil into useful products such as liquefied petroleum gas, gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils"

-wikipedia

Explanation:

[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]

An oil refinery or petroleum refinery is an industrial process plant where crude oil is transformed and refined into useful products such as petroleum naphtha, gasoline, diesel fuel, asphalt base, heating oil, kerosene, liquefied petroleum gas, jet fuel and fuel oils.

Answer:

[tex]m_{solute}=0.85g[/tex]

Explanation:

Hello there!

In this case, according to the given information for the parts per million of methane in this solution, it is possible for us to first write the equation for this unit of concentration as shown below:

[tex]ppm=\frac{m_{solute}}{m_{solvent}} *1x10^6[/tex]

In such a way, since the septic tank has a mass of 50,000 g, the mass of methane into it is calculated as shown below:

[tex]m_{solute}=\frac{ppm*m_{solvent}}{1x10^6}[/tex]

Now, we plug in the numbers to obtain:

[tex]m_{solute}=\frac{17*50000g}{1x10^6}\\\\m_{solute}=0.85g[/tex]

Regards!

Answer:

The loudness of sound is determined, in turn, by the intensity, or amount of energy, in sound waves. The unit of intensity is the decibel (dB) Intensity of sound results from two factors: the amplitude of the sound waves and how far they have traveled from the source of the sound.

Explanation:

Answer:

(β-decay) is a type of radioactive decay in which a beta particle (fast energetic electron or positron) is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclide. For example, beta decay of a neutron transforms it into a proton by the emission of an electron accompanied by an antineutrino; or, conversely a proton is converted into a neutron by the emission of a positron with a neutrino in so-called positron emission.

Explanation:

Answer:

Beta decay occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other. ... In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p Æ n + e+ +n.

Explanation:

Answer:

A, increases the average kinetic energy of the molecules

Explanation:

temperature is a measure of the average kinetic energy of particles (atoms, ions and molecules), if one raises the temperature, one is raising the average kinetic energy of the particles.

Answer:

All of these answers are correct.

Explanation:

They are all correct because producers make their food(energy) through photosynthesis, they provide food to herbivores and therefore the rest of the food chain, and without them, the food chain would collapse and all the consumers would starve.

Answer:

Answer:

mark me brainliest

Explanation:

An acid is a substance that has a pH lower than 7. For example, hydrochloric acid, sulphuric acid, citric acid, ethanoic acid (vinegar). A base is a substance that neutralises an acid – those that dissolve in water are called alkalis. An alkali is a soluble substance with a pH higher than 7.

Answer:

The chemical which give hydrogen ion when dissolve in water is called acid.for example:HCL,HNO3,H2SO4 etc.

The bases that dissolve in water and produce hydroxyl ions are called alkalis.for example:NaOH,KOH etc.

Explanation:

Answer:

butene

Explanation:

Answer:

A

Explanation:

Answer: The earth is closer to the sun than neptune is

Explanation:

Answer:

The Earth is closer to the Sun than Neptune is.

Explanation:

pov