What laboratory test is best for screening for iron deficiency in a population of 1 to 3 year old children who have a high incidence of elevated blood lead levels?

Answer:

synthetic

Explanation:

Answer:

D. the solvent particles to be spread further out and have more to move, increasing their kinetic energy.

Explanation:

Answer:

m(CoCl2)=6.516g

Explanation:

c(CoCl2)=0.674M

V(CoCl2)=0.0750L

M(CoCl2)=128.9 g/mol

m(CoCl2)=?

c(CoCl2)×V(CoCl2)=m(CoCl2)/M(CoCl2)

m(CoCl2)= c(CoCl2)×V(CoCl2)×M(CoCl2)

m(CoCl2)= 0.674mol/dm³ × 0.075dm³×128.9g/mol

m(CoCl2)=6.516g

Answer: Scientists work independently to form theories about the Earth without sharing d

Scientists work independently to form theories about the Earth without sharing data.

Solar system is defined as the grouping of the eight planets and their moons in orbit around the sun, as well as other smaller bodies like comets, asteroids, and meteoroids.

It can also be defined as the Sun's orbiting objects are confined by gravity to one system.

An orbiting collection of planets, meteors, or other celestial bodies is referred to as a star system.
The Sun, an ordinary star, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto make up our solar system.

Our solar system is referred to as the "solar system" because our Sun is called Sol after the Latin word for Sun, "solis," and because anything related to the Sun is termed "solar."

Thus, scientists work independently to form theories about the Earth without sharing data.

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Answer:

C. and D. i think

Explanation:

Answer:

Nitrogen = 0.3 atm

Oxygen = 0.25 atm

Argon  = 0.45 atm

Explanation:

According to Dalton's law of partial pressure, the total pressure in the container is equal to sum of the partial pressures of the individual gases.

Given;

Total pressure of the gases, P_total = 1 atm

Pressure of nitrogen, P_nitrogen = 0.3 atm

Pressure of oxygen, P_oxygen = 0.25 atm

Pressure of argon, P_argon = ?

\(P_{total} = P_{nitrogen} + P_{oxygen} + P_{argon}\\\\1 \ atm= 0.3 \ atm + 0.25 \ atm + P_{argon}\\\\1 \ atm= 0.55 \ atm + P_{argon}\\\\ P_{argon} = 1 \ atm - 0.55 \ atm\\\\ P_{argon} = 0.45 \ atm\)

Therefore, the contribution of each gas to the total pressure of the gas mixture is;

Nitrogen = 0.3 atm

Oxygen = 0.25 atm

Argon  = 0.45 atm

Answer:

B. shape of wings

Explanation:

Insect, (class Insecta or Hexapoda), any member of the largest class of the phylum Arthropoda, which is itself the largest of the animal phyla. Insects have segmented bodies, jointed legs, and external skeletons (exoskeletons).

Higher classification: Hexapoda

If Earth revolved at a faster rate, what would most likely be daylight hours would decrease. Therefore, option B is correct.

Earth's rotation can be described as the rotation of planet Earth around its own axis and changes in the orientation of the rotation axis in space. Earth rotates once in 24 hours around Sun, but once in 23 hours, 56 minutes, and 4 seconds w.r.t. other distant stars.

Earth's rotation can be slowed slightly with time therefore daylight was shorter in the past due to the tidal effects the Moon has on Earth's rotation.

The earth's spinning on its axis causes days to turn into nights. The rise and fall of tided effect on the Direction of the Wind, Cyclones, Ocean currents, and change of day and night.

If the earth's rotation becomes faster it will complete one spin in less than 24 hours therefore, the daylight hours would decrease.

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Answer:

Internal Cue

Explanation:

Answer:

an internal cue

Explanation:

just think

Answer:

The answer will be listed below.

Explanation:

Kinetic Energy- Energy of motion, increases with mass

Potential Energy- Stored energy, increases with height

Both- Increases with velocity

Answer:

D. 108g of water

Explanation:

16g CH4 produces 2(18)g of H20

1g CH4 produces \(\frac{36}{16}\)g of H2O

48g CH4 produces \(\frac{36}{16}\)×48

                                108g of H20

Answer:

D. 108g of water

Explanation:

Differences in temperature lead to variations in density between warm and cold air, causing hot-air masses to rise up while cooler ones sink down. This vertical motion sets off two distinct atmospheric zones: one with low-pressure beneath ascending hot-air parcels and another featuring high-pressure atop descending cool-air pockets.

Consequently, wind results from airflow travelling from spots with higher-pressure zones towards locations with lower ones — faster winds indicate more potent differences in these pressures.

It's apparent that in this image winds seem to be moving seamlessly across waters onto lands; However, it's worth noting that such movement has underlying principles governing these movements. One such mechanism involves heating disparities between waters and soils where warming rates vary depending on numerous factors.

Consequently, the formerly mentioned disparities in heating engender differences in temperature gradients wherein colder denser air over oceans results in areas of high pressure while warmer rising air forms low-pressure pockets over land. This creates a powerful force that moves winds from cold marine regions towards hot continental regions.

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Answer:

D) 14 Electrons

Explanation:

I took the test and got it right

The total number of electrons that can occupy the f sublevel is 14 electrons. Thus option D is correct.

Electrons can be defined as a negatively charged subatomic particle that together with protons and neutrons forms an atom's nucleus. It is the lightest subatomic particles.

s orbital has 2 electrons in pair

p orbital has 6 electrons in pair

d orbital has 10 electrons in pair

f orbital has 14 electrons in pair.

Thus, the total number of electrons that can occupy the f sublevel is 14 electrons. Thus option D is correct.

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An acid-base indicator works by changing color as the pH of a solution changes during a titration. The choice of indicator for a particular acid-base titration depends on the pH range over which the titration occurs and the pKa of the indicator.

An acid-base indicator is a weak acid or base that undergoes a color change when it is protonated or deprotonated. For example, phenolphthalein is a commonly used indicator for acid-base titrations because it is colorless in acidic solutions and pink in basic solutions. During a titration, as the titrant (usually a strong acid or base) is added to the analyte (usually a weak acid or base), the pH of the solution changes. At a certain pH, the indicator undergoes a protonation or deprotonation reaction, causing a color change that signals the endpoint of the titration.

The choice of indicator for a particular titration depends on the pH range over which the titration occurs and the pKa of the indicator. The indicator should have a pKa value that is close to the pH of the equivalence point of the titration. The pH range over which the indicator undergoes a color change should also match the pH range over which the analyte undergoes a significant pH change. For example, methyl orange is a suitable indicator for a strong acid-strong base titration because it changes color in the pH range of the equivalence point of the titration, which is around pH 7. On the other hand, bromothymol blue is suitable for titrating weak acids against strong bases because it changes color in the pH range of the equivalence point of the titration, which is around pH 8.

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The statement "Reaction of heating potassium permanganate produces potassium manganate" is false.

The reaction of heating potassium permanganate (KMnO₄) does not produce potassium manganate (K₂MnO₄). Instead, it undergoes a thermal decomposition reaction, resulting in the formation of different products.

When heated, potassium permanganate decomposes into potassium manganate (K₂MnO₄), manganese dioxide (MnO₂), and oxygen gas (O₂).

The reaction can be represented as follows:

2 KMnO₄(s) → K₂MnO₄(s) + MnO₂(s) + O₂(g)

Therefore, heating potassium permanganate leads to the formation of potassium manganate, along with manganese dioxide and oxygen gas. The color change from purple to green observed during the reaction is due to the formation of potassium manganate.

However, it is important to note that potassium manganate is not the sole product of the reaction but one of the products alongside manganese dioxide and oxygen gas.

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Complete question :

Reaction of heating potassium permanganate produces potassium manganate. T/F

The density of benzonitrile is 1.008 g/cm³, under the condition it is kept under 20°C.
Now
In order to find the density of benzonitrile, the individual can apply the knowledge of the CRC Handbook of Chemistry and Physics. Hence, the density of benzonitrile is 1.008 g/cm³ at 20°C.
Then, solving the sub questions
1. The mechanism of benzonitrile include ammoxidation of toluene, that is considered a  reaction with ammonia and oxygen  at 400 to 450 °C (752 to 842 °F).
The side products of this reaction are, carbon dioxide, water etc
2. The melting point of a substance can be applied to determine its purity. If a substance possess a melting point range that is too broad or too low, it may shows that it is impure.
3. Sources of loss can spillage, evaporation, and incomplete reactions.

4. The product and starting material may have different spectral features depending on the type of spectroscopy used.

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The complete question is
Find the density of benzonitrile using the crc handbook of chemistry and physics .
1. State the formation and identify the side product. 2. Discuss purity based on the melting point.
3. Identify three sources of loss.
4. What spectral features allow you to differentiate the product from the starting material?

The total work produced by the steam engine needs to be calculated and given that the steam engine accepts heat during isothermal expansion at 250 °C and discards heat through isothermal compression at 25 °C.

The magnitude of the entropy change during the isothermal compression step is 750 J/K. The efficiency of the steam engine is 65% of the maximum attainable theoretical efficiency. Given that the efficiency of the steam engine is 65% of the maximum attainable theoretical efficiency.

Hence, the actual efficiency will be:

η_actual = η_max × 0.65Where,

η_max is the maximum attainable theoretical efficiency.

η_actual = 0.65 × η_maxNow,

the efficiency of a Carnot engine (η_Carnot) can be given as:η_Carnot = 1 - (T_cold / T_hot)Here, T_hot and T_cold are the temperatures of the hot and cold reservoirs respectively.

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Work is a measure of the energy transfer that occurs when an object is moved against a force. Work is defined as the product of the force applied to an object and the displacement of the object in the direction of the force. Hence the total work produced by the engine is 47,175 J.

1. Converting the temperatures from degrees Celsius to Kelvin.

T1 = 250 °C + 273.15 K = 523.15 K

T2 = 25 °C + 273.15 K = 298.15 K

2. The maximum attainable theoretical efficiency.

ηmax = 1 - T2 / T1 = 1 - 298.15 / 523.15 = 42.9%

3. The efficiency of the steam engine.

η = 0.65 * ηmax = 0.65 * 42.9% = 27.7%

4. The entropy change during the isothermal expansion step.

dS = 750 J/K

5. The total work produced by the engine.

W = η * (T1 - T2) * dS = 0.277 * (523.15 - 298.15) * 750 J/K = 47,175 J

Therefore, the total work produced by the engine is 47,175 J.

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Answer:

A system can be either closed or open: A closed system is a system that is completely isolated from its environment.

An open system is a system that has flows of information, energy, and/or matter between the system and its environment, and which adapts to the exchange.

Answer:

water and a salt

Explanation:

Degenerate orbitals are orbitals that have the same energy level and are equivalent in their spatial distribution. They are often found in atoms with partially filled subshells or in molecules with similar electronic configurations.

Some characteristics of degenerate orbitals include:

Degenerate orbitals have the same energy: This means that electrons in degenerate orbitals have equal energy levels and cannot be distinguished from one another by their energy.

All orbitals belonging to the same atom are degenerate with respect to one another: This means that within an atom, all orbitals with the same energy level are degenerate.

Degenerate orbitals do not necessarily have the same shape and orientation: This means that orbitals with the same energy level can have different shapes and orientations, such as p orbitals in different directions.

Degenerate orbitals may or may not have the same number of electrons: This means that degeneracy is related to energy level rather than electron count.

Overall, the degeneracy of orbitals is an important concept in understanding electronic structure and chemical bonding.

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Answer:

Condensation starts to occur throughout the liquid instead of just on the surface.

Explanation:

after the food leaves the stomach it enters the small intestine

Answer:

after the food leaves the stomach it enters the small intestine

Explanation:

Answer:

Atomic number is the number of protons in an atom

Atomic mass is the mass of an atom.

Explanation:

which of the following is the best choice for presenting the relationship between atomic number and atomic mass?

Atomic number is the number of protons in an atom

Atomic mass is the mass of an atom.

The order of alkanes according to their increasing density can be seen below:

This is referred to a hydrocarbon with a single carbon to carbon bond and examples include butane etc.

Its density increases with increasing number of carbon and hydrogen atoms thereby making it the most appropriate choice.

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The transfer of energy by heat from colder bodies to hotter bodies is the perfect example for entropy of a spontaneous reaction.

Spontaneous reactions are described as those chemical or biological reactions that usually take place without the influence of external factors. Non- Spontaneous reactions are described as those chemical reactions that generally requires an energy input to proceed or that cannot take place without the influence of external factors.

The transfer of energy by heat from colder bodies to hotter bodies is an example of spontaneous process in which the entropy of the system of bodies increases. The melting of the ice cube placed in a room causes an increase in the entropy of the room.

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Answer:

a because where the air travels for example a radiator

Answer:

C.

In areas with the same altitude

Explanation:

Answer:

Chemical potential energy being converted to kinetic energy

Explanation: