1) a calorimeter containing 200.0 g of water at an initial temperature of 25.0 °c was used to measure the heat involved in a reaction. when the reaction was finished, the temperature of the water increased to 60.0 °c. the specific heat of water is 4.184 j/ g °c.

The EPA's claim that sulfur dioxide levels have fallen by 85% between 1990 and 2016 is accurate based on the calculation of the percent decrease.

To determine whether the EPA's claim about the decrease in sulfur dioxide levels is accurate, we can calculate the percent decrease between 1990 and 2016.

Step 1: Find the difference between the initial and final values.
The initial value in 1990 is 100% (the entire amount of sulfur dioxide levels).
The final value in 2016 is 15% (85% decrease from the initial value).

Step 2: Calculate the percent decrease.
To find the percent decrease, we subtract the final value from the initial value and then divide the result by the initial value. Finally, we multiply by 100 to express the decrease as a percentage.

Percent decrease = [(Initial value - Final value) / Initial value] * 100
Percent decrease = [(100 - 15) / 100] * 100
Percent decrease = (85 / 100) * 100
Percent decrease = 85%

Therefore, the calculated percent decrease between 1990 and 2016 is 85%, which matches the EPA's claim. The claim is accurate as the percent decrease aligns with the EPA's statement that sulfur dioxide levels have fallen by 85% during this time period.

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Answer:

The horizontal rows in the periodic table are periods, while the vertical rows are called groups.

Explanation:

Answer:

Xe

Explanation:

if ur talking about what it is for xenon

The correct answer is that none of the substances listed actually speeds up the absorption of alcohol.

As the rate of alcohol absorption depends on various factors such as the amount of alcohol consumed, the rate of gastric emptying, and the presence of food in the stomach. However, carbonated water and starchy foods may help slow down the absorption of alcohol by delaying the emptying of the stomach, which can result in a slower increase in blood alcohol concentration. Meat products may also help in slowing down the absorption of alcohol due to their high protein content, which can reduce the rate of gastric emptying. Plain water, on the other hand, may actually dilute the alcohol content in the stomach but will not speed up its absorption. It is important to note that while these substances may help to delay the absorption of alcohol, they do not reduce its effects on the body or prevent intoxication. The only effective way to reduce the effects of alcohol is to consume it in moderation or to avoid it altogether. It is also important to never drink and drive, and to seek medical attention if one experiences severe symptoms of alcohol consumption.

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Answer: Quartz

Explanation: I looked it up ;)

Answer:

good electrical conductor

lustre in appearance

Answer:

-1,300 kJ

Explanation:

P₄  +  3 O₂  ⇒  P₄O₆     ΔH = -1,640.1 kJ    (EQ 1)

P₄O₁₀  ⇒  P₄  +  5 O₂    ΔH = 2,940.1 kJ    (EQ 2)

These are the equations you are given.  You need to make these equations into the equation below.

P₄O₆  +  2 O₂  ⇒  P₄O₁₀  (end equation)

Look at the product side of the end equation.  You need to produce P₄O₁₀.  In the EQ 2, P₄O₁₀ is on the reactant side.  Flip the equation.  Since you flipped the equation, the enthalpy will have the opposite sign.

P₄  +  5 O₂  ⇒  P₄O₁₀    ΔH = -2,940.1 kJ

On the reactant side of the end equation, you need P₄O₆ and 2 O₂.  First, rearrange the equation so that P₄O₆ is on the right side.  In EQ 1, P₄O₆ is on the product side.  Flip the equation.  Like the last one, the sign will change.

Now, cancel out all possible values.  P₄ will cancel out since there is one on each side of the equation.  Since there is 5 O₂ on one side and 3 O₂ on the other, subtract the two and put the remainder on the side of the larger value.

P₄  +  5 O₂  ⇒  P₄O₁₀    ΔH = -2,940.1 kJ

P₄O₆  ⇒  P₄  +  3 O₂     ΔH = 1,640.1 kJ    

P₄O₆  +  2 O₂  ⇒  P₄O₁₀

This should be the resulting equation.  Now, add the two enthalpies together to find the overall enthalpy.

-2,940.1 kJ  +  1,640.1 kJ  = -1,300 kJ

The overall enthalpy is -1,300 kJ.

-867.7Answer:

Explanation:

-867.7

The balanced chemical equation is:

0.5C7H16 + O2 → 0.5CO2 + H2O

For balancing the chemical equation C7H16 + O2 → CO2 + H2O, we can use linear algebraic techniques. We need to determine the coefficients that balance the number of atoms on both sides of the equation.

Let's denote the coefficients for C7H16, O2, CO2, and H2O as a, b, c, and d, respectively.

The balanced chemical equation can be written as:

aC7H16 + bO2 → cCO2 + dH2O

To balance the carbon (C) atoms, we have:

7a = c (Equation 1)

To balance the hydrogen (H) atoms, we have:

16a = 2d (Equation 2)

To balance the oxygen (O) atoms, we have:

2b = 2c + d (Equation 3)

We have three equations (Equations 1, 2, and 3) and four unknowns (a, b, c, d). To solve this system of equations, we can write it in matrix form and find the solution using linear algebraic techniques.

The augmented matrix for the system of equations is:

[ 7 0 -1 0 | 0 ]

[ 0 0 0 -2 | 0 ]

[ 0 -2 2 -1 | 0 ]

By performing row operations to row-reduce the augmented matrix, we can obtain the solution:

[ 1 0 -0.5 0 ]

[ 0 1 -1 -0.5 ]

[ 0 0 0 0 ]

The solution to the system of equations is:

a = 0.5

b = 1

c = 0.5

d = 1

Putting the values of a,b,c, and d we get the balanced chemical equation as:

0.5C7H16 + O2 → 0.5CO2 + H2O

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Answer:

D

Explanation:

All of the above are great examples!

"Endothermic reactions are those which absorb heat during the reaction."

Answer:

Percent composition of O is 48g80g×100%=60%

Explanation:

Answer:

1. Empirical formula => CH2O2

2. Molecular formula => C2H4O4

Explanation:

From the question given above, the following data were obtained:

Carbon (C) = 26.4 %

Hydrogen (H) = 3.3 %

Oxygen (O) = 70.3 %

Molar mass of compound = 91.0 g/mol

Empirical formula =..?

Molecular formula =..?

1. Determination of the empirical formula of the compound.

C = 26.4 %

H = 3.3 %

O = 70.3 %

Divide by their molar mass

C = 26.4 /12 = 2.2

H = 3.3 /1 = 3.3

O = 70.3 /16 = 4.39

Divide by the smallest

C = 2.2 /2.2 = 1

H = 3.3 /2.2 = 2

O = 4.39 /2.2 = 2

Empirical formula => CH2O2

2. Determination of the molecular formula of the compound.

Molar mass of compound = 91.0 g/mol

Empirical formula => CH2O2

Molecular formula => [CH2O2]n

We shall determine the value of n as follow:

[CH2O2]n = 91

[12 + (2×1) + (2×16)]n = 91

[12 + 2 + 32]n = 91

46n = 91

Divide both side by 46

n = 91/46

n = 2

Molecular formula => [CH2O2]n

Molecular formula => C2H4O4

In the given case where 26.4 % Carbon , 3.3 % Hydrogen , 70.3 % Oxygen , and Molar Mass: 91.0 g/mol the:

Given:

Carbon (C) = 26.4 %  

Hydrogen (H) = 3.3 %  

Oxygen (O) = 70.3 %  

Molar mass of compound = 91.0 g/mol  

Determination of the empirical formula of the compound:-

The ratio is CHO = 1 : 1.5 : 2

multiply with 2 to find correct and complete number ratio

C = 1 × 2 = 2

H = 1.5 × 2 = 3

O = 2 × 2 = 4

Thus,  the Empirical formula => \(C_2H_3O_4\)

Mass × n = molar mass

12 × 2 + 1 × 3 + 16 × 4 = 91

24 + 3 + 64 = 91

91 = 91

Thus moles are 1 which means

molecular formula =  (\(C_2H_3O_4\))\(_1\)

Thus, here in the given data:

Molecular Formula: (\(C_2H_3O_4\))\(_1\)

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Answer:

radiation because heat is being transferred

Answer:

It is ultraviolet radiation, which is going to be radiation.

Explanation:

When ultraviolet radiation from the sun reaches the skin, it damages the skin cells and causes mutations in their DNA.

Answer:

Im pretty sure the answers b

Explanation:

Because if its talking about overall tempature the it means ihas tension with high surface.

Answer:

Hydrogen

Explanation:

These are what hydrogen isotopes look like

The equation that illustrates the relationship between wave velocity, frequency, and wavelength is: v = λ * f

v represents the wave velocity, which is the speed at which the wave travels through a medium. It is usually measured in meters per second (m/s).

λ (lambda) represents the wavelength of the wave, which is the distance between two consecutive points of similar phase on the wave. It is usually measured in meters (m).

f represents the frequency of the wave, which is the number of complete cycles or oscillations of the wave that occur in one second. It is usually measured in hertz (Hz).

The equation v = λ * f is known as the wave equation or the wave speed equation. It states that the wave velocity is equal to the product of the wavelength and the frequency of the wave.

This equation implies that as the frequency of a wave increases, the wavelength decreases, and vice versa, while keeping the wave velocity constant. In other words, if the frequency increases, the wave becomes more compressed and the distance between consecutive points of similar phase decreases.

On the other hand, if the frequency decreases, the wave becomes more spread out, and the distance between consecutive points of similar phase increases.

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Answer:

4 i2  + 9 O2 --> 2 i4O9

Explanation:

Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

t1/2= half-life of phosphorus-32= 14.3 days

t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

Answer:

IT IS CORONAAAAAAAAAAAAAAAAAAAAA

Answer:

coronavirus is a lung disease, it makes it so that you have a fever, cough, trouble breathing, mild headaches, and sometimes even nausea. you should be cautious because if your at high risk your gonna have trouble recovering from it. wearing a mask could help protect others from the spread of coronavirus. others wearing a mask prevents you from the spread of coronavirus. if you do catch it, make sure you see your doctor and isolate yourself for two weeks to a month and try not to go out as much.

Q < Ksp, no precipitate will form when 10.0 mL of 0.0100 M NaF is mixed with 10.0 mL of 0.0100 M Ba(NO₃)₂.

To determine if a precipitate will form, we need to compare the ion product (Q) to the solubility product (Ksp). The balanced equation for the reaction is:

Ba(NO₃)₂ + 2 NaF → BaF₂ + 2 NaNO₃

The initial concentration of Ba(NO₃)₂ is 0.0100 M x (10.0 mL / 20.0 mL) = 0.00500 M
The initial concentration of NaF is 0.0100 M x (10.0 mL / 20.0 mL) = 0.00500 M

The reaction will go to completion because both reactants are soluble ionic compounds, so all the Ba²⁺ and F⁻ ions will react to form BaF₂, leaving behind Na⁺ and NO³⁻ ions in the solution.

The concentration of Ba²⁺ ions is 0.00500 M and the concentration of F- ions is 2 x 0.00500 M = 0.0100 M (due to the stoichiometry of the balanced equation).

The ion product (Q) is [Ba²⁺][F⁻]^2 = (0.00500 M)(0.0100 M)^2 = 5.00 x 10^-7

Since Q is smaller than the Ksp (2.4 x 10^-5), no precipitate will form. The solution will remain clear.

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Answer:

H2

Explanation:

Hydrogen gas isn't a compound but it is diatomic when found naturally hence the 2

Answer:he final equation will be C3H8 + 502 ----> 3CO2 + 4H20.

Explanation:There will be 10 oxygens on the products side and 2 on the reactants so to balance these out, we multiply the 02 on the reactants side by 5. The final equation will be There will be 10 oxygens on the products side and 2 on the reactants so to balance these out, we multiply the 02 on the reactants side by 5. The final equation will be C3H8 + 502 ----> 3CO2 + 4H20.

Answer:

false

Explanation:

in a double reaction, the negative ions switch places. not be replaced.

As per the given reaction, one mole of copper sulphate reacts to give one mole of Cu. 100 ml of 0.05 M copper sulphate contains 0.005 number of moles of CuSO₄.

Copper sulphate is an ionic compound formed by the reaction of copper metal with other metal sulphate. Copper sulphate undergoes redox reaction with other metals forming copper metal.

Given that, the reaction system contains 100 ml of 0.05 M of copper sulphate.

The no.of moles of copper sulphate = volume × molarity

no.of moles = 0.1 L × 0.05 M = 0.005 moles.

As per the reaction, 0.005 moles of copper sulphate will give 0.005 moles of Cu.

atomic mass of Cu = 63.5 g/mol

then mass of 0.005 moles of Cu = 0.005 g ×63.5 g/mol = 0.317 g.

Therefore, the mass of copper formed in this reaction is 0.317 g.

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Your question is incomplete. But your complete question probably was:

CuSO4 + Zn →→ Cu + ZnSO4

 if excess of zinc is added to 100ml of 0.05M CuSO4  the amount of copper formed is:

Answer:

Ionic bond is the intermediate in strength.

Explanation:

Ionic bond is weaker than covalent bond and stronger than hydrogen bond in strength because in ionic bond, the atoms attract each other due to opposite in charge. Ionic bond is a type of bond in which one atom losses electron completely and become cation (positive charge) while the other atom receive the electron and become anion (negative charge). so they attract each other due to opposite charges.

Answer:

Example of a scientific question:

Does the angle of a ramp change the distance a toy car will travel?

Explanation:

The CEC for this soil sample is 675.2 cmol(+)/kg.

The % Base Saturation for this soil sample is approximately 136.62%.

The % Acid Saturation for this soil sample is approximately 60.55%.

To    calculate the CEC, % Base Saturation (B.S.), and % Acid Saturation for the given soil sample:

a. Calculation of CEC (Cation Exchange Capacity):

CEC is the sum of exchangeable cations in the soil. From the given results, we have:

CEC = Ca2+ + Mg2+ + K+ + Al3+

CEC = (100 mg/L + 45 mg/L + 85.5 mg/L + 94.2 mg/L) / (25 g / 1000)

CEC = 168.7 mg / (25 g / 1000)

CEC = 675.2 cmol(+)/kg

b. Calculation of % Base Saturation (B.S.):

% B.S. represents the percentage of CEC occupied by base cations. In this case, we consider Ca2+, Mg2+, and K+ as base cations. The formula to calculate % B.S. is:

% B.S. = (Ca2+ + Mg2+ + K+) / CEC * 100

% B.S. = (100 mg/L + 45 mg/L + 85.5 mg/L) / (168.7 cmol(+)/kg) * 100

% B.S. = 230.5 mg / (168.7 cmol(+)/kg) * 100

% B.S. = 136.62%

c. Calculation of % Acid Saturation:

% Acid Saturation represents the percentage of CEC occupied by acid cations, in this case, H+ and Al3+. The formula to calculate % Acid Saturation is:

% Acid Saturation = (H+ + Al3+) / CEC * 100

% Acid Saturation = (8.0 mg/L + 94.2 mg/L) / (168.7 cmol(+)/kg) * 100

% Acid Saturation = 102.2 mg / (168.7 cmol(+)/kg) * 100

% Acid Saturation = 60.55%

Please note that the given values were in milligrams per liter (mg/L), and the CEC and % Saturation values were calculated assuming a conversion from mg/L to cmol(+)/kg using the mass of the soil sample (25 g).

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