Which condition would cause surface runoff to increase in a particular location?
1. Covering a dirt road with pavement.
2. Planting grasses and shrubs on a hillside.
3. Having a decrease in the annual rainfall.

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer:

Anaerobic respiration takes place in the absence of oxygen.

Anaerobic respiration in yeast is used during brewing and bread-making.

Explanation:

glucose → ethanol + carbon dioxide.

C 6H 12O 6 → 2C 2H 5OH + 2C0 2.

Two similarities between gravity, electric force, and magnetism are:

What is gravity?

This refers a force that attracts a body towards the centre of the earth or any other physical body having mass. Gravity keeps the planets in orbit around the sun and the moon around the Earth.

Magnetism is the force exerted by magnets when they attract or repel each other. Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms. Each atom has electrons, particles that carry electric charges.

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Answer:

Baking Soda a base

Explanation:

We know that to neutralize an acid we add base to it. Baking Soda is a type of base so when we add Baking Soda or any other base to battery acid or any other acid we can neutralize it and get salt and water.

Acids are the substance which are sour in taste and can turn blue litmus paper red. For example, Lemon and Orange.

Bases are the substance which are bitter in taste and can turn red litmus paper blue. For example, Baking Soda and Soap.

Explanation:

Write the balanced equation

Let's start off by writing the reaction for the formation of cryolite:

Al₂O₃  +  6NaOH  +  12HF    →    2Na₃AlF₆  +  9H₂O

Determine the limiting factor

moles = mass ÷ molar mass

moles of Al₂O₃ = 12200 g ÷ 101.96 g/mol = 119.65 mol

moles of NaOH = 57400 g ÷  39.997 g/mol = 1435.11 mol

moles of HF = 57400 g ÷ 20.01 g/mol = 2868.57 mol

Since Al₂O₃ has the smallest number of moles in the reaction, it is the limiting factor. As such we will have to use the moles of Al₂O₃ to determine the moles of cryolite that will be produced.

Find the mole ratio between the limiting factor and the cryolite

The mole ratio of Al₂O₃ : Na₃AlF₆ based on the balanced equation is 1 : 2

∴ since the moles of Al₂O₃ = 119.65 mol

        the moles of Na₃AlF₆ = 119.65 mol × 2 = 239.3 mol

Calculate the mass of the Cryolite

Mass cryolite = moles × molar mass

                      = 239.3 mol × 209.9 g/mol

                      =  50229.07 g

      ∴ kilograms of cryolite ≈ 50.23 kg

Answer:

D. Malleability

Explanation:

Gold is made up of the element Au and it is a metal.

Pyrite is iron sulfide and it is a non-metal.

Answer:

Explanation:

substance (as an acid or salt) that when dissolved (as in water) conducts an electric current.

Answer:

An electrolyte is a compound which produces ions when dissolved in a solution such as water. These ions have either a positive or negative electrical charge, which is why we refer to these compounds as electro-lytes

Answer:

The answer is Double - Replacement Reactions

Explanation:

Double - Replacement Reactions are two different things that change places with each other.

The Number of Moles of Zn is 0.34108 and the number of moles of Cr2O3 is 0.14671.

What is Number of Moles?

The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that material is what determines how many moles there are of that substance. A mole of any substance is equal to 6.0231023, or Avogadro's number. The ratio of a substance's given mass in any kind of chemical reaction to the mass of one mole of that material is the number of moles of that substance.

Moles of Zn can be calculated by using the formula

22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.

Moles of Cr2O3 can be calculated by using the formula

22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.

Hence, 0.34108 and 0.14671 will be the number of moles for Zn adn Cr2O3 respectively.

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Zn has a mole count of 0.34108, while Cr2O3 has a mole count of 0.14671.

What is Number of Moles?
The number of moles of a substance is determined by the ratio of its given mass in a chemical reaction towards the mass of one mole of that substance. A mole, or 6.0231023, is equal to one mole of any substance. The number of moles of a substance is defined as the mass of one mole divided by the given mass of the substance in any type of chemical reaction.

The formula can be used to determine moles of zinc.
22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.

The formula can be used to determine moles of Cr2O3.
22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.

Therefore, the moles of Zn and Cr2O3 will be 0.34108 and 0.14671, respectively.

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Ni-60's neutron mass defect is 0.5505.

The difference between a nucleus' mass and the total mass of its component particles is known as the mass defect.

Every atom, with the exception of pure hydrogen, has a neutron inside its nucleus. The name of the particle comes from the fact that it lacks an electrical charge and is hence neutral. Neutrons have a very high density.

Each atom's nucleus contains a proton, a subatomic particle. The particle possesses a positive electric charge that is opposite and equal that of the electrons.

No matter the isotope, each hydrogen atom has a proton; every helium atom has two; and each lithium atom has four protons.

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Answer:

you have to decide 865,000 with 1000 and the answer is 865

Answer:

The extract is boiled with FeSO4 and acidified with concentrated H2SO4. The appearance on Prussian blue colour indicates the presence of nitrogen

Explanation:

PLS mark it brainliest

Answer:

option B. less time than the other runners

hope it helps you

Track runners will all cover the same distance. The winner will take less time than the other runners. Therefore, the correct option is option B.

Despite the direction of something like the journey, distance is the overall path that an item in motion has traveled. Since just the length of the path travelled is calculated as well as the motion direction is ignored, distance is referred to as a scalar number.

Displacement is described as the overall alteration of an object's location and motion direction. Displacement is recognized as a vector quantity since it takes into consideration both the directions of the motion and the amount of the changing position. Track runners will all cover the same distance. The winner will take less time than the other runners.

Therefore, the correct option is option B.

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a. The molality of solution (a) is 0.231 mol/kg.

b. The molality of solution (b) is 0.388 mol/kg.

c. The molality of solution (c) is 0.244 mol/kg.

Molality (m) is defined as the number of moles of solute per kilogram of solvent. We can use the formula below to calculate the molality:

m = moles of solute / mass of solvent (in kg)

a) For solution (a):

moles of solute = 0.455 mol

mass of solvent = 1.97 kg

m = 0.455 mol / 1.97 kg

m = 0.231 mol/kg

b) For solution (b):

moles of solute = 0.559 mol

mass of solvent = 1.44 kg

m = 0.559 mol / 1.44 kg

m = 0.388 mol/kg

c) For solution (c):

moles of solute = 0.119 mol

mass of solvent = 488 g = 0.488 kg

m = 0.119 mol / 0.488 kg

m = 0.244 mol/kg

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Answer:

Proxima Centauri was discovered in 1915.

Robert Innes used a blink comparator to examine a photographic plate showing an area of 60 square degrees around Alpha Centauri.

The sixty-four-meter radio telescope at Parkes Observatory in Australia.

they used the James Webb Space Telescope and The sixty-four-meter radio telescope.

no nothing as been to Proxima Centauri it would take about 54,400 years to get there.  

getting to Proxima Centauri, our solar system's nearest star, would take four years and three months. And that is travelling at light speed, a velocity well beyond our reach. The quickest we could currently get to Proxima Centauri, using our fastest rockets, is 80,000 years.

Explanation:

Approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.

The balanced equation provided is:

6CO2 + 6H2O -> C6H12O6 + 6O2

From the equation, we can see that for every 6 moles of water (H2O), 1 mole of glucose (C6H12O6) is produced. Therefore, we need to determine the amount of water required to produce 7.2 moles of glucose.

The mole ratio between water and glucose is 6:1. This means that for every 6 moles of water, we obtain 1 mole of glucose. To find the amount of water needed for 7.2 moles of glucose, we set up a proportion using the mole ratio:

(6 moles H2O / 1 mole glucose) = (x moles H2O / 7.2 moles glucose)

Solving for x, we can cross-multiply:

6 moles H2O * 7.2 moles glucose = x moles H2O * 1 mole glucose

43.2 moles H2O = x moles H2O

Therefore, we need 43.2 moles of water to produce 7.2 moles of glucose.

To convert moles of water to grams, we need to know the molar mass of water, which is approximately 18 g/mol. Using the molar mass, we can calculate the mass of water needed:

Mass of water = moles of water * molar mass of water

Mass of water = 43.2 moles * 18 g/mol

Mass of water = 777.6 g

Therefore, approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.

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Answer:

Explanation:

A?

Answer:

0.00044 g/mL

Explanation:

First, 0.220 g of KIO₃ are dissolved in 50 mL, so the concentration at this point is:

Then 2.00 mL of this solution are added to 8.00 mL of water (final volume = 10.00 mL). We calculate the concentration of the resulting solution:

Finally, to this 10 mL solution, another 10.00 mL were added. Thus the KIO₃ (or IO₃⁻) concentration is:

Answer:

Matter is any substance that has mass and takes up space. Any physical object consists of matter. It doesn't matter whether it's an atom, element, compound, or mixture. It's all matter. (Not a pun, i promise ツ)

However, unlike some believe, not everything you encounter in the world is matter. Matter can be converted into energy, which has neither mass nor volume. So, light, sound, and heat are not matter. Most objects have both matter and some form of energy, so the distinction can be tricky. For example, a candle flame certainly emits energy (light and heat), but it also contains gasses and soot, so it is still matter. The building blocks of matter are called "atoms" and "molecules." They, too, are matter. The matter we can detect normally is called "baryonic" matter. However, there is another type of matter out there, which can't be directly detected. But its influence can. It's called dark matter.

Attached below is a picture of examples of matter.

Key words and phrases:

matter, heat, light, dark matter, baryonic matter, sound, energy, mass, volume, space, physical

Hope this helps! Brainliest would be much appreciated! Have a great day! :)

Answer:

The answer is D) Magnesium

Explanation:

Because smog is a mixture

sea water is a mixture

air is an element

And salt solvent

It can only be D

Answer:

A miniature keychain lamp produces one or two lumens

Answer:

11. Redox

12. Acid/Base

13. Precipitation

14. Combustion

15. Precipitation

The decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

The initial mass of the radioisotope is calculated as follows;

N = N₀(¹/₂)^t/h

where;

24 M/s = N₀(¹/₂)^(22/32)

24 M/s = N₀(0.62)

N₀ = (24 M/s)/(0.62)

N₀ = 38.7 M/s

Thus, the decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

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Ques.1: Why do you think that you had to use a thin layer of onion skin, rather than a thick layer for the microscope?

Ans:- It is because, I the onion peel is thick layered, then it will be hard or impossible to see through the microscope.

Ques.2: When iodine reacts with starch, it produces a blue-black color. Starch is a white substance which plants use to store food. What structure did you see better because of the iodine? Why did you see this structure better?

Ans: Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil.

This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color.

Due to this, we can see the structure better.

Ques.3: From low power to high power, what structures became clearer in the stained onion tissue?

Ans: From lower to higher power, we can see:-

-- Large, rectangular interlocking cells,

-- Clearly visible distinct cell walls surrounding the cells,

-- Dark stained nucleus,

-- Large vacuoles at the center,

-- Small granules may be observed inside the cells (within the cytoplasm)

Ques.4: What is the shape of an onion cell?

Ans: The shape of an onion cell is rectangular or square in shape.

Answer:

0.083 mol

Explanation:

Molar volume of gas at r.t.p = 24 dm³

Number of moles = volume(dm³) / 24

Number of moles = 2/24 = 0.083...

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To calculate the following for test tube 1 and test tube 2:

1. The number of moles of copper(II) sulfate used:

Test tube 1: 0.2 g of copper(II) sulfate was used, which is equivalent to 0.001255 moles (0.2 g / 159.60 g/mol).
Test tube 2: 0.4 g of copper(II) sulfate was used, which is equivalent to 0.002510 moles (0.4 g / 159.60 g/mol).

2. The heat absorbed by the water, in joules:

Test tube 1: Q = (10.0 g) x (4.186 J/g°C) x (20.0°C) = 837.2 J

Test tube 2: Q = (10.0 g) x (4.186 J/g°C) x (30.0°C) = 1257.9 J

3. The change in internal energy of the copper(II) sulfate:
Since the energy released by the copper(II) sulfate is absorbed by the water, the change in internal energy of the copper(II) sulfate is equal to the negative of the heat absorbed by the water.
Test tube 1: ΔU = -837.2 J
Test tube 2: ΔU = -1257.9 J
4. The reaction enthalpy, in joules/mole:
The reaction enthalpy can be calculated using the formula ΔH = ΔU + PΔV, where PΔV represents the work done by the system. Assuming that the reaction was carried out at constant pressure (i.e., atmospheric pressure), PΔV can be approximated to zero, and thus the reaction enthalpy is equal to the change in internal energy.
Test tube 1: ΔH = -837.2 J / 0.001255 mol = -666,876 J/mol
Test tube 2: ΔH = -1257.9 J / 0.002510 mol = -500,357 J/mol
Therefore, the results can be recorded in the following table:

|           | Moles of CuSO4 used | Heat absorbed by water (J) | Change in internal energy (J) | Reaction enthalpy (J/mol) |
|-----------|---------------------|-----------------------------|---------------------------------|---------------------------|
| Test tube 1 | 0.001255            | 837.2                       | -837.2                          | -666,876                 |
| Test tube 2 | 0.002510            | 1257.9                      | -1257.9                         | -500,357                 |

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Based on the balanced chemical equation given below, the correct statement is:

a) If 2 mol of N₂ is consumed, 4 mol of NO will be produced.

The balanced chemical equation represents the stoichiometry of the reaction, showing the relationship between the reactants and products. In this equation, the coefficients indicate the ratio of moles between the different substances involved.

In the equation, 2 N₂ (nitrogen gas) molecules react to form 4 NO (nitric oxide) molecules. This means that for every 2 moles of N2 consumed, 4 moles of NO are produced.

Option a) states that if 2 mol of N2 is consumed, 4 mol of NO will be produced, which aligns with the balanced equation. Therefore, option a) is the correct statement.

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The number of nanomoles of acetylcholine in the original 12 ml sample is 2676.6.

Based on the given information, we can assume that the decrease in pH is due to the dissociation of acetic acid into acetate and hydrogen ions. Since there was no buffer in the assay mixture, the pH change indicates that the sample is not able to resist changes in acidity.

To determine the number of nanomoles of acetylcholine in the original 12 ml sample, we can use the following steps:

1. Calculate the change in hydrogen ion concentration:
Δ[H⁺] = 10^(pH₂ - pH₁) = 10^(6.78 - 7.63) = 0.223

2. Since acetic acid dissociates to yield one hydrogen ion, we can calculate the concentration of acetic acid in the sample:
[HAc] = Δ[H⁺] = 0.223 M

3. We can then use the balanced equation for the conversion of acetylcholine to choline and acetic acid:
Acetylcholine + H₂O → Choline + Acetic acid

Since all the acetylcholine is converted to acetic acid, we can assume that the initial concentration of acetylcholine is equal to the final concentration of acetic acid:
[Acetylcholine] = [HAc] = 0.223 M

4. To convert the concentration to nanomoles, we can use the formula:
n = C x V x 10^9
where n is the number of nanomoles, C is the concentration in M, and V is the volume in liters.

Since the volume of the sample is 12 ml or 0.012 L, we can calculate the number of nanomoles of acetylcholine in the sample:
n = 0.223 x 0.012 x 10^9 = 2676.6 nanomoles

Therefore, there were 2676.6 nanomoles of acetylcholine in the original 12 ml sample.

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The total internal energy in the container is 329.77 Btu and the enthalpy in the container is 385.14 Btu.

Using the steam tables, we can determine the specific volume of water at the given pressure and temperature. The specific volume of water is 0.01658 \(ft^3/lbm\).

The mass of water in the container is 0.92 lbm, so the total volume of the water is:

V = m/v = 0.92 lbm / 0.01658 \(ft^3/lbm\)  = \(55.539 ft^3\)

Assuming the water is at saturation, we can find the total internal energy and enthalpy by using the values in the steam tables for saturated water at 100 psia.

From the steam tables, the total internal energy of saturated water at 100 psia is 358.05 Btu/lbm, so the total internal energy in the container is:

U = m * u = 0.92 lbm * 358.05 Btu/lbm = 329.77 Btu

From the steam tables, the enthalpy of saturated water at 100 psia is 419.02 Btu/lbm, so the enthalpy in the container is:

H = m * h = 0.92 lbm * 419.02 Btu/lbm = 385.14 Btu

Therefore, the total internal energy in the container is 329.77 Btu and the enthalpy in the container is 385.14 Btu.

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