Suppose Pasteur’s swan-necked flasks containing boiled broth became cloudy twenty-four hours afterboiling. Which choice could best explain the turbidity or cloudiness in the broth without supportingspontaneous generation?a.Endospores in the broth survived boiling and grew after the broth cooled.b.Contaminating organisms in the broth killed by boiling became alive again after the brothcooled.c.Chemicals in the broth came together to form living organisms.d.The broth allowed light to pass through it with less interference after boiling.e.Solid material in the broth dissolved during boiling

Answer:

b) 3x10³m³

Explanation:

The volume of each astronaut breathing in m³ is:

500cm³ * (1x10⁻⁶m³ / 1cm³) = 5x10⁻⁴m³

In 1 minute, the volume is:

5x10⁻⁴m³ * 15 = 7.5x10⁻³m³

In 1 hour:

7.5x10⁻³m³ /min  * (60min / 1 hour) = 0.45m³/h

In 1 day:

0.45m³/h * (24h / 1 day) = 10.8m³/day

In 1 year:

10.8m³/day * (365 days / 1 year) = 3942m³ = 3.9x10³m³

That is approximately:

while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

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Light energy travels in the form of waves.

Answer:

No, your missing some bonds

Answer:

Explanation:

Sodium is both an electrolyte and mineral. It helps keep the water (the amount of fluid inside and outside the body's cells) and electrolyte balance of the body. Sodium is also important in how nerves and muscles work. Most of the sodium in the body (about 85%) is found in blood and lymph fluid.

Answer:

a

Explanation:

Answer:

A. it gives up electrons

Explanation:

In a redox reaction, the reducing agent is the element or compound that undergoes oxidation and gives up electrons. The oxidizing agent is the element or compound that undergoes reduction and gains electrons.

Hope that helps.

Option C) New atoms are created when a new substance is formed is not true about the Law of Conservation of Mass.

The Law of Conservation of Mass states that "Mass can neither be created nor be destroyed". This means that the mass of an object will remain the same, regardless of the changes that occur to its form or composition. The law is a fundamental principle of physics and chemistry and is used to calculate the amount of matter that is present in a given sample.

The same number of atoms are in both the products and reactants as the mass of the reaction is conserved.

Since the same number of atoms are present in both reactants and products, then no new atoms or compounds are created in the process.

Hence, the correct option is C).

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Answer:c

Explanation:

i think that what is was for me

Heating a solid material greatly affects its molecular structure because heat energy cause melting by breaking bonds.

When a solid is heated the molecule gain energy and starts to vibrate faster and faster. Originally, the structure is gradually weakened which has the effect of sweet the solid. Further heating provides more energy until the ray start to break free of the structure. When heat is added, the molecules gain energy and vibrate, and force other molecules to move apart. This enlargement is minimum in solids compared with liquidating a substance making its atoms and molecules move faster. This happens whether the substance is a solid, a liquid, or a gas.

So we can conclude that Molecular structure has a notable effect on solid surface free energy

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Explanation:

a. 1 nm = 10Å

683nm=683×10Å

=6830 Å

b. 1 mi/h=0.44704

520 mi/h=520×0.44704

=232.4608

c. 1 g/cm3=62.427961 lb/ft3

0.714 g/cm3=0.714×62.427961 lb/ft3

=44.573564

d. 1°C =9/5 +32 =33.8°F

-164°C = -164×9/5+32 = -263.2°F

Marks as brainest one.

Answer:

23.12 atm

Explanation:

First, add together the moles of the two samples:

5.25 moles + 4.20 moles = 9.45 moles

273 + 25 = 298 K for the temperature

volume is 10.0 L

Since we have moles now, we have to rearrange our ideal law equation to solve for pressure:

\(P = \frac{nRT}{V}\)

\(\frac{(9.45 moles) X (0.08206) X (298 K)}{10.0 L}\)

9.45 X .08206 X 298 all divided by 10.0 = 23.09202 atm (or 23.12)

Answer:

heterogeneous mixture

The substance is not uniform in appearance and each part of the mixture contains a combination of different ingredients in different ratios is also known as heterogeneous mixtures. Hence option A is correct.

Mixture is defined as a substance that is composed of two more chemical compounds or substances that do not chemically mix. Solutions, suspensions, and colloids are the three categories into which mixtures can be divided based on particle size. A mixture's components maintain their individual physical characteristics.

When the composition of a solution is not uniformly distributed throughout, the mixture is said to be heterogeneous. A single-phase is, by definition, a pure substance or a homogenous combination. A heterogeneous mixture has two or more phases. A heterogeneous mixture is made up of elements that continue to exist physically apart.

Thus, the substance is not uniform in appearance and each part of the mixture contains a combination of different ingredients in different ratios is also known as heterogeneous mixtures. Hence option A is correct.

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Answer:

A chemical reaction is a process where bonds are formed between reactant elements causing interaction hence products are formed.

The two types of chemical reaction:

\({ \boxed{ { \rm{ \bold{ \dashrightarrow \: reversible \: reaction}}}}}\)

This is a reaction where reactants interact chemically to form respective products and also products can react to reverse the reaction (to form reactants).

An example of reaction of hydrogen and oxygen:

\({ \rm{2H_{2(aq)} +O_{2(aq)} \: {}{ ^{ \dashrightarrow}_{ \dashleftarrow} \: 2H _{2}O _{(l)} }}}\)

\({ \boxed{ \rm{ \bold{ \dashrightarrow irreversible \: reaction}}}}\)

It is a one way reaction, cannot be reversed

\({ \rm{Mg_{(s)} + N _{2(g) \: }\rightarrow \: \: Mg _{3} N _{2(s)} }}\)

Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

I'm pretty sure your answer will be 9

Answer:

9

Explanation:

Mass number = proton + neutron

                       = 4 + 5

                       = 9

Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

Answer:

b. R decreases, V is constant, I increases

Explanation:

when we increase the diameter of wire increases ,resistance decreases and current increases.Therefore, the option is b.  

Resistance is an electrical quantity which opposes the electric current in the circuit. Resistance is directly proportional to the length of the wire and inversely proportional to the diameter of the wire. If length of wire increases resistance will increases and if the diameter of the wire increase resistance will decreases.

                                R = ρ L/A

Here ρ is the resistivity

        L is the length of the wire

        A  is the cross-sectional area of wire/diameter of the wire

Voltage is the potential difference between two terminals of voltage source. Current is the flow of electrons in the circuit. Voltage is the product of current and resistance.

                              V=IR

Rewrite the above equation interms of current

                              I=V/R

From the above equation we can say that current is inversly proportional to the resistance.Therefore,the correct option is b.

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Answer:

your answer would be C

Explanation:

atoms that picks up the extra electron becomes a negatively charged ion (anion)

if we reverse that,

it would be a positively charged ion due to losing an electron

Answer:higher than and higher than

Explanation:

Tthe initial temperature of the polystyrene sample is 39.4°C.

Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C

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Answer:

Although they receive a bad rap from the media and pharmaceuticals, the majority of prokaryotes are either harmless or actually help eukaryotes, such as animals and plants, to survive and only a small number of species are responsible for serious illnesses.

Explanation:

Answer:

See attached picture and explanation.

Explanation:

Hello!

In this case, given the instruction on the molecule, we can infer that A is the central atom as it must have a full octet which is reached via one bond with each B atom. Moreover, via a double bond with C, both A and C are able to have the required full octet as shown on the attached picture.

For the name, it looks like the formaldehyde (\(CH_2O\)) which has two single-bonded hydrogen atoms and one double-bonded oxygen atom in order to have a full octet forth both carbon and oxygen.

Regards.

Answer:On a sloped parking lot

Explanation:

The magnetic potential energy between them decreases when the interaction between the magnets as the north poles are brought closer together.

A magnetic dipole moment can have the potential energy in a magnetic field that depends on its magnetic field orientation.

Magnetic potential energy can be described as the energy stored in a system of magnets as a result of the exertion of a magnetic force on each other. When two magnetic poles attract or repel each other then the potential energy can be stored in their relative positions.

The magnetic force will cause similar poles to repel one another, and opposite magnetic poles to attract. Magnets have north and south poles, and the magnetic potential energy depends not only on the position within a magnetic field but also on the orientation of the magnet.

When the poles attract each other their magnetic potential energy and when they repel the magnetic potential energy decreases.

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Answer: the magnetic potential energy between them increases.

Explanation:

When two like poles are facing each other, they repel. Pushing them toward each other requires energy. This means that their potential energy increases as they are pushed together. Therefore, as the teacher pushes the magnets together, the magnetic potential energy between them increases.

Acetic acid only partially ionizes in water as it is a weak acid.

Weak Acids are the acids that do not completely dissociate into their constituent ions when dissolved in solutions.

When dissolved in water, an equilibrium is established between the concentration of the weak acid and its constituent ions.

Acetic acid, also known as ethanoic acid, is a weak acid with the chemical formula CH₃COOH. It is known to be the active component of vinegar.

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Answer:

  (c) Light from star 2 reaches star 1 in 63 years

Explanation:

You want to know the correct conclusion given three stars lie in a line and the distances from Star 3 to Star 2 and Star 1 are 138 light years and 75 light years, respectively. Star 2 is closer to Star 1 than to Star 3.

The way the question and answer choices are written suggests the sum of distances between 1 and 2 and between 2 and 3 is the distance between 1 and 3. That is, the distance between Star 1 and Star 2 is ...

  1 to 2 = (1 to 3) - (2 to 3) = 138 ly - 75 ly = 63 ly

The light from Star 2 reaches Star 1 in 63 years.

__

Additional comment

Units of miles and kilometers are irrelevant when it comes to distances between stars. Since 2 is closer to 1 than to 3, it means the distance from 1 to 2 cannot be greater than 75 ly, so cannot be 213 light years.

Five is the total number of peaks due to singly charged ions in the complete mass spectrum of chlorine, \(Cl_{2}\)

How many peaks do \(Cl_{2}\)'s molecular ions have?

The mass spectra of compounds with a single chlorine atom show two molecular ion peaks. This is because there are two isotopes of chlorine, 35Cl and 37Cl.

The molecular ion and fragment ions will both have peaks in the mass spectrum. When a mass spectrum is interpreted, a specific molecule can be located, confirmed, or its quantity can be calculated. the base summit of a mass spectrum's tallest (strongest) peak, caused by the ion with the highest relative abundance

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Five is the total number of peaks due to singly charged ions in the complete mass spectrum of chlorine, \(Cl_{2}\).

How many peaks do 's molecular ions have?

The mass spectra of compounds with a single chlorine atom show two molecular ion peaks. This is because there are two isotopes of chlorine, 35Cl and 37Cl.

The molecular ion and fragment ions will both have peaks in the mass spectrum. When a mass spectrum is interpreted, a specific molecule can be located, confirmed, or its quantity can be calculated. the base summit of a mass spectrum's tallest (strongest) peak, caused by the ion with the highest relative abundance

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Answer:

Explanation:

HCl    + NaOH     =    NaCl    +     H₂O.

1 mole   1 mole           1 mole          1 mole

6.93  g of hydrochloric acid = 6.93 / 36.5 = .189 mole of HCl

2.4 g of NaOH = 2.4 / 40 =  .06 mole of NaOH

NaOH is in short supply so it is the limiting reagent .

1  mole of NaOH reacts with 1 mole of HCl to give 1 mole of Water

.06 mole of NaOH will react with .06 mole of HCl to give .06 mole of water

Water formed = .06 mole

= .06 x 18 = 1.08 g

= 1.1 g