Which statement about science is true?
A. Only older people from educated families are able to make important scientific discoveries.
B. Most scientific knowledge was only discovered in the last 10 years.
C. People with different backgrounds have contributed to science
throughout history
D. It will be difficult for you to become a scientist if no one in your family ever worked in the field.

Answer:

14

Explanation:

If the sum of three consecutive even numbers is 48, the smallest of these numbers is 14.

Answer:

E = 8.84×10⁻¹⁷ J

Explanation:

Given data:

Wavelength of wave = 2.25 nm (2.25×10⁻⁹ m)

Energy of wave = ?

Solution:

Formula:

E = hc/λ

c = 3×10⁸m/s

h =6.63 ×10⁻³⁴ Js

now we will put the values,

E = 6.63 ×10⁻³⁴ Js ×  3×10⁸m/s / 2.25×10⁻⁹ m

E = 19.89×10⁻²⁶ Jm / 2.25×10⁻⁹ m

E = 8.84×10⁻¹⁷ J

Answer:

don't no answer

Explanation:

d don't no answer

When 25 liters of  \(SO_2\) reacts with 75 liters of \(O_3\), a total of 126.0 liters of  \(SO_3\) will be produced.  

When 25 liters of sulfur dioxide reacts with 75 liters of oxygen, a large number of sulfur trioxide molecules will be produced.

The balanced chemical equation for the reaction is:

\(SO_2 + O_2 - > SO_3\)

We can use the mole ratios of the reactants and products to calculate the number of moles of each substance present in the reaction. We can then use the molar volume of each substance to calculate the volume of the reaction mixture.

Next, we can use the molar volume of each substance to calculate the volume of the reaction mixture. The molar volume is 13.6 cubic centimeters per mole, and the molar volume of Oxygen is 24.6 cubic centimeters per mole.

Therefore, the volume of the reaction mixture is:

2 moles of \(SO_2\) * 13.6 cubic centimeters per mole = 26.4 cubic centimeters

4 moles of  \(SO_2\) * 24.6 cubic centimeters per mole = 99.6 cubic centimeters

The total volume of the reaction mixture is the sum of the volumes of the  \(SO_2\) and  \(O_2\):

26.4 cubic centimeters + 99.6 cubic centimeters = 126.0 cubic centimeters

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The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.

Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.

 t = (L^2) / (4D)

where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).

Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.

  t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds

  Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days

  Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.

Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.

  t = (L^2) / (4D)

  Rearranging the equation to solve for L:

  L = √(4Dt)

  Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))

  L ≈ 49.65 cm or 0.163 ft

The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.

The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.

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Answer:

The bag of skin that holds and helps to protect the testicles. The testicles make sperm

Explanation:

True.

The Mass Undergoes change only in ( Solid state to liquid state ) Ice Cube to Water .

Mass changes from mg to litre.

\(\huge\mathfrak\red{hope \: it \: helps}\)

Answer:

Different types of rocks have different chemical composition.

Explanation:

Rock can be distinguished from each other by their chemical composition which is a product of the minerals they contain.

Answer:

what about chemistry notes​?

Explanation:

The quantity of heat produced by burning one mole of wax is determined by the heat of combustion (∆Hc) of the wax, which is typically around -40 kJ/mol.

To calculate the quantity of heat produced when one mole of wax is burned, we need to consider the heat of combustion (∆Hc) of the wax. The heat of combustion is the amount of heat released when a substance undergoes complete combustion with oxygen.

For candle wax, which is primarily composed of hydrocarbons like paraffin, the heat of combustion can vary, but it's generally around -40 kJ/mol. The negative sign indicates that the process is exothermic, meaning heat is released. Therefore, burning one mole of candle wax would produce approximately 40 kJ of heat.

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a. The chemical reaction can be rewritten as a word equation as follows:

Hydrogen Peroxide -> Oxygen + Water

b. Evidence that a chemical reaction has occurred includes the production of a new substance (oxygen and water), a change in the physical properties of the reactants (change in color, odor, or temperature), and the release of energy (evolution of oxygen gas).

c. The reaction is likely exothermic, which means it releases energy. This is because the reaction produces new substances (oxygen and water) and releases energy in the form of oxygen gas. In an endothermic reaction, the reactants would absorb energy from the surroundings.

Answer its a

Explanation:

Answer:

1. place some sulfuric acid in a beaker and warm it in a water bath.

2. add a spatula of copper(II) oxide powder to the acid and stir with a glass rod.

3. continue adding copper(II) oxide powder until it is in excess.

4. filter the mixture to remove the excess copper(II) oxide.

Explanation:

The bond energy per mole for breaking all the bonds of oxygen (O2) can be calculated by considering the energy required to break each individual bond.

Oxygen gas (O2) consists of a double bond between two oxygen atoms. The bond energy represents the energy required to break this bond. The average bond energy for an O-O bond in oxygen is approximately 498 kilojoules per mole (kJ/mol).

Since there are two O-O bonds in O2, the total bond energy per mole for breaking all the bonds of oxygen can be calculated by multiplying the bond energy by the number of bonds, resulting in approximately 996 kJ/mol. This represents the energy needed to completely break apart all the O-O bonds in one mole of oxygen molecules.

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The 95% confidence interval estimate for the mean wake time with the drug treatment is between 76.6 min and 89.6 min.

The 95% confidence interval estimate is calculated based on the sample mean and the standard deviation. In this case, the sample mean wake time after treatment is 83.1 min, and the standard deviation is 20.7 min. With these values, we can construct the confidence interval estimate.

The formula for calculating the confidence interval estimate is:

CI = sample mean ± (critical value * standard deviation / square root of sample size)

Using a 95% confidence level, the critical value is 1.96. The sample size in this case is 21.

Plugging in the values:

CI = 83.1 ± (1.96 * 20.7 / √21)

Simplifying the equation:

CI = 83.1 ± 8.08

Therefore, the 95% confidence interval estimate for the mean wake time with the drug treatment is between 76.6 min (83.1 - 8.08) and 89.6 min (83.1 + 8.08).

This result suggests that the mean wake time before the treatment, which was 105.0 min, is outside the confidence interval estimate. The confidence interval estimate does not include the value of 105.0 min, indicating that the mean wake time with the drug treatment is significantly different from the mean wake time before the treatment.

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Answer:

Atoms that are isotopes have the same number of protons.

4) The temperature went up by 3 degrees

5) The reaction is exothermic

6) The burning of hydrocarbons is an exothermic reaction

One of the characteristics of a chemical change is that there could be a change in the temperature of the system. The temperature of the system could be found to have been increased or decreased as the case may be.

In any case, the change in the temperature of the system is what is going to tell is whether the reaction was exothermic or endothermic. If the reaction is endothermic, there is going to be a drop in temperature but if the reaction is exothermic, there is going to be an increase in temperature.

Now we can see from the table that the temperature is increasing by a factor of about three degrees so we can say that the reaction is exothermic.

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Answer:

The molarity will be "0.26 M".

Explanation:

The given values are:

Mass,

= 2.00 g

Volume of solution,

= 100 mL

or,

= \(\frac{100}{1000}\)

= \(0.1 \ L\)

Molar mass of KCl,

= 74.5 gm

Now,

Moles of KCl will be:

=  \(\frac{Given \ mass}{Molar \ mass}\)

=  \(\frac{2}{74.5}\)

=  \(0.026\)

hence,

The molarity will be:

=  \(\frac{Moles \ of \ solute}{Volume \ of \ solution}\)

On substituting the values, we get

=  \(\frac{0.026}{0.1}\)

=  \(0.26 \ M\)

Answer:

The sun's circumference is about 2,713,406 miles (4,366,813 km). It may be the biggest thing in this neighborhood, but the sun is just average compared to other stars. Betelgeuse, a red giant, is about 700 times bigger than the sun and about 14,000 times brighter.

Explanation:

looked it up

Explanation:

The sun's circumference is about 2,713,406 miles (4,366,813 km). It may be the biggest thing in this neighborhood, but the sun is just average compared to other stars. Betelgeuse, a red giant, is about 700 times bigger than the sun and about 14,000 times brighter

Answer:

0.086

Explanation:

got it on acellus

The mass of the dry solute recovered from the given data is 0.086 g.  Option C

To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.

Given the data provided:

Boat Mass: 0.730 g

Boat + Solution: 0.929 g

Boat + Dry: 0.816 g

To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:

Mass of Dry Solute = (Boat + Dry) - (Boat Mass)

Mass of Dry Solute = 0.816 g - 0.730 g

Mass of Dry Solute = 0.086 g

Therefore, the correct answer is c) 0.086 g.

The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.

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The graph would indicate an inverse linear relationship between pressure and volume. Option B

The graph would indicate a direct inverse relationship between pressure and volume. In other words, as the volume decreases, the pressure increases, and as the volume increases, the pressure decreases.

This relationship is known as Boyle's Law, which states that for a fixed amount of gas at a constant temperature, the product of pressure and volume is constant.

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Missing parts:

Assume that temperature and number of moles of

gas are constant in this problem.

Use the graph to complete the statement below.

This graph shows that pressure and volume have

✓

a direct linear relationship

an inverse linear relationship

a direct nonlinear relationship

an inverse nonlinear relationship

Answer: a direct linear relationship

Explanation:

The given statement that "the rate of a second order reaction can depend on the concentrations of more than one reactant" is true because the rate of the reaction is proportional to the concentration of both reactants.

The second-order reaction is a chemical reaction in which two reactants interact and the rate of the reaction is proportional to the concentration of both reactants or to the square of the concentration of a single reactant. The equation is as follows:

k = k[reactant1] [reactant2] or k = k[reactant1]²

The reaction rate constant (k) for a second-order reaction is proportional to the concentration of one or two reactants. The concentration of the reactants has an impact on the reaction rate, as indicated by the order of the reaction.

Therefore, the statement that "the rate of a second order reaction can depend on the concentrations of more than one reactant" is true.

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The balanced redox reaction in basic solution is: \(CIO(aq) + CO_2(aq) + OH^{-(aq)} \rightarrow CIO_2(g) + CO_2(g) + H_2O(l)\)

To balance this redox reaction in basic solution, we first need to identify the oxidation state of each element in the equation. We see that the oxidation state of chlorine changes from +1 to +4, while the oxidation state of carbon changes from +4 to +2.

Next, we balance the equation in acidic solution, as we normally would, and then add OH⁻ to both sides of the equation to neutralize the H⁺ ions and form water molecules. This adds an equal number of H⁺ and OH⁻ ions to both sides of the equation, so the charge balance is maintained.

After balancing the equation in basic solution, we make sure that the number of atoms of each element is the same on both sides, and that the charges are balanced. Finally, we add the phases of each species to complete the equation.

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The term mole concept is used here to determine the compounds with greatest mass. Here 2.1 mol Br₂ has the greatest mass. The correct option is B.

One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12. The equation used to calculate the number of moles is:

Number of moles (n) = Given mass / Molar mass

a) Number of moles of atoms = 9.5 × 10²⁴ / 6.022 × 10²³ = 1.57 × 10⁴⁷

Mass = n × Molar mass of 'C'

= 1.57 × 10⁴⁷ × 12.011 = 1.89 g

b) Mass = 159.80 × 2.1 = 335.58 g

c) n = 1.86 × 10²² / 6.022 × 10²³ = 3.088 × 10⁴⁴

Mass = 3.088 × 10⁴⁴ × 153.82 = 4.74 × 10⁴⁶ g

d) 59.5 g

Thus The term mole concept is used here to determine the compounds with greatest mass. Here 2.1 mol Br₂ has the greatest mass.

One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12. The equation used to calculate the number of moles is:

Number of moles (n) = Given mass / Molar mass

a) Number of moles of atoms = 9.5 × 10²⁴ / 6.022 × 10²³ = 1.57 × 10⁴⁷

Mass = n × Molar mass of 'C'

= 1.57 × 10⁴⁷ × 12.011 = 1.89 g

b) Mass = 159.80 × 2.1 = 335.58 g

c) n = 1.86 × 10²² / 6.022 × 10²³ = 3.088 × 10⁴⁴

Mass = 3.088 × 10⁴⁴ × 153.82 = 4.74 × 10⁴⁶ g

d) 59.5 g

Thus the correct option is B.

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Answer:

not a

Explanation:

i took the test on ed

Answer:

B

Explanation:

I took the quiz on Edge

Explanation:

Metals and non-metals can be identified either by their position in the periodic table or by their properties.

he metal elements are found on the left hand side of the periodic table, and the non-metal elements are found on the right. You can imagine a zig-zag line, starting at B-Al-Si, separating metals from non-metals.

The mass of MgCO₃ is 1.9 g, the calculations are shown in the below section.

The balanced chemical reaction is shown below

Na₂CO₃   +   Mg(NO₃)₂     ⇒   2 NaNO₃   + MgCO₃

0.200 M   0.0450 M                                        ?

10.0           5.00 mL                                          ?

Since the volume and concentration of Mg(NO₃)₂ and Na₂CO₃  is given , we can calculate the number of moles for each of them and then determine the limiting reagent.

Convert the volume of  Mg(NO₃)₂and Na₂CO₃ to liters:

5.00 mL x ( 1 L/1000 mL ) =   5.00 x 10⁻³ L

10.00 mL x ( 1L/ 1000 mL ) = 1.000 x 10 ⁻² L

Number of  mol Mg(NO₃)₂ = ( 0.0450 mol /L  ) x 5.00 x 10⁻³ L

                                          = 2.25 x 10⁻⁴ mol Mg(NO₃)₂

Number of mol Na₂CO₃ = ( 0.200 mol / L ) x 1 x 10⁻² L  

                                       = 2.000 x 10⁻³  mol Na₂CO₃

Limiting reagent

= 2.25 x 10⁻⁴ mol Mg(NO₃)₂ x ( 1 mol Na₂CO₃ / mol  Mg(NO₃)₂ )

= 2.25 x 10⁻⁴ mol  Na₂CO₃ required .

Limiting reagent is Mg(NO₃)₂ since 2.25 x 10⁻⁴ mol  Na₂CO₃ is required to react completely with  2.25 x 10⁻⁴Mg(NO₃)₂, and there's an excess.

Number of  mole  of MgCO₃ produced

= 2.25 x 10⁻⁴ mol  Mg(NO₃)₂ x ( 1 mol MgCO₃ / 1 mol Mg(NO₃)₂ )

= 2.25 x 10⁻⁴ mol  MgCO₃

No. of Mole = mass/molar mass

Mass = No. of Mole × molar mass

2.25 x 10⁻⁴ mol  MgCO₃ x   84.31 g/mol  = 1.90 g

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The pH of the solution containing 2.80 M acetic acid is 2.34.

Given, The Ka value for acetic acid, CH3COOH(aq), is 1.8x10^-5.Molar concentration of acetic acid, CH3COOH(aq), is 2.80 M.

Step 1 The equation for the ionization of acetic acid is as follows.CH3COOH(aq) + H2O(l) ⇆ H3O+(aq) + CH3COO-(aq)

Step 2Expression for Ka isKa = [H3O+][CH3COO-]/[CH3COOH(aq)]1.8 x 10-5 = [H3O+][CH3COO-]/2.80[H3O+] = √(Ka [CH3COOH(aq)]) = √(1.8 x 10-5 x 2.80) = 0.00462 M

Step 3pH = -log[H3O+] = -log(0.00462) = 2.34

So, the pH of the solution containing 2.80 M acetic acid is 2.34.

Acetic acid (CH3COOH) is a weak acid with a Ka value of 1.8x10⁻.

By utilizing this Ka value and the molar concentration of acetic acid, the pH of a 2.80 M acetic acid solution can be calculated.

Using the equation Ka = [H3O+][CH3COO-]/[CH3COOH(aq)], and after simplifying,

it can be determined that [H3O+] = √(Ka [CH3COOH(aq)]).

After substituting the values for Ka and [CH3COOH(aq)], [H3O+] is found to be 0.00462 M.

Finally, pH can be calculated by the expression pH = -log[H3O+], and we obtain the answer of pH=2.34.

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A graph enables you to easily denote the relationship between variables as positive or negative.

This question is incomplete but I will try to help you as much as I can. A graph is one of the numerous was of data representation in science. A graph has two axes; the vertical ( Y - axis) and the horizontal (X - axis).

A graph enables you to easily denote the relationship between variables as positive or negative. A graph is sometimes called a scatter plot.

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