Please help me. ? :)

Answer:

B.

Will providing sunflowers with Fertilizer X cause the flowers to produce more seeds?

Explanation:

The question B is a sort of untested idea. It is the ideal hypothesis for Regina to test and see if the brand of the fertilizer will improve her sunflower seed production.

To scientifically carryout this test, Regina must set up an experiment. The experiment will help her affirm her grandfather's observation about the fertilizer.

The dependent variable here is the yield of the sunflower as we know. The sunflower will produce more seeds based on how nourished it is with available nutrients.

In her experiment, she can use the normal soil, soil with fertilizer x and maybe organic manure mixed with soil to compare different results. She then proceeds to plant her seed and on the long run observe the output.

From the result of her experiment, she can then conclude on her hypothesis. With the experiment, she can prove wether the fertilizer will improve the yield of the seeds or not.

Answer:

The answer is B - Will providing sunflowers with Fertilizer X cause the flowers to produce more seeds?

Explanation:

I had the question a little bit of go and it was B and I got it right.

Answer:

True it can be misinterpreted.

Explanation:

Answer:

The energy emitted by sodium atoms is 33.38 j.

Explanation:

Given data:

Wavelength of photon = 589 nm   or  5.89 × 10⁻⁷m

Mass of excited sodium atoms = 3.78 mg

Energy emitted by 3.78 mg sodium atoms = ?

Solution:

First of all we we will calculate the energy of photon at given wavelength.

E = h.c/ λ

h = planck's constant =  6.626 × 10⁻³⁴  J.s

c = 3 × 10⁸ m/s

E = ( 6.626 × 10⁻³⁴  J.s × 3 × 10⁸ m/s ) / 5.89 × 10⁻⁷m

E = 19.878 × 10⁻²⁶  J.m / 5.89 × 10⁻⁷m

E =  3.375 × 10⁻¹⁹ J

Now we will calculate the number of atoms in 3.78 mg of sodium.

Mass of excited sodium = 0.00378 g  or 3.78 × 10⁻³ g

Molar mass of sodium = 23 g/mol

We know that   23 g of sodium = one mole = 6.02 × 10²³ atoms

(3.78 × 10⁻³ g / 23 g ) × 6.02 × 10²³ atoms = 0.989 × 10²⁰ atoms

The number of atoms are 0.989 × 10²⁰ atoms.

E =   0.989 × 10²⁰ × 3.375 × 10⁻¹⁹ J = 33.38 j

To calculate the energy emitted by 3.78 mg of sodium atoms, one must find the number of photons and the energy per photon, given the wavelength of 589 nm. The steps involve calculating the number of moles, multiplying by Avogadro's number, and using the energy formula for a photon (E = hc/λ).

The question asks how much energy is emitted by 3.78 mg of excited sodium atoms emitting light at a wavelength of 589 nm. To find this out, we need to calculate the number of photons that can be emitted by the given mass and then calculate the energy of each photon.

First, we'll find out the number of moles of sodium in 3.78 mg:

Number of moles = Mass (g) / Molar mass of sodium (Na) = 3.78 x 10-3 g / 22.99 g/mol

Then, we will multiply the number of moles by Avogadro's number to get the number of sodium atoms.

Now, the energy (E) of a single photon is given by E = hc/λ, where h is Planck's constant (6.626 x 10-34 J*s), c is the speed of light (3.00 x 108 m/s), and λ is the wavelength of light. Substituting the given wavelength value of 589 x 10-9m and solving the equation provides the energy of a single photon.

Finally, by multiplying the energy of one photon by the total number of sodium atoms, we can estimate the total energy emitted.

Answer:

86 mL

Explanation:

First find the moles of Pb (NO3)2

n=cv

where

c ( concentration)= 0.210 M

v ( volume in L) =0.05

n= 0.210 × 0.05

n= 0.0105

Using the mole ratio, we can find the moles of KCl by multiplying by 2

n (KCl) =0.0105 ×2

=0.021

v (KCl)= n/ c

= 0.021/ 0.244

=0.08606557377

=0.086 L

= 86 mL

Answer:

The volume of 0.244 M KCl solution is required 86.07 mL.

Explanation:

[tex]Concentration=\frac{Moles}{Volume (L)}[/tex]

Moles of lead nitrate in 50.0 mL of 0.210 M solution be n.

Molarity of the lead nitrate solution = 0.210 M

Volume of the solution = 50.0 mL = 0.050 L ( 1 mL = 0.001 L)

[tex]0.210 M=\frac{n}{0.050 L}[/tex]

[tex]n=0.210 M\times 0.050 L=0.0105 mol[/tex]

According to reaction given, 1 mole of lead nitrate reacts with 2 moles of KCl.

Then 0.0105 moles of lead nitrate will react with:

[tex]\frac{2}{1}\times 0.0105 mol=0.021 mol[/tex] of KCl

Moles of KCl = 0.021 mol

Volume of KCl solution = V

Molarity of the KCl solution = 0.244 M

[tex]0.244 M=\frac{0.021 mol}{V}[/tex]

[tex]V=\frac{0.021 mol}{0.244 M}=0.08607 L = 86.07 mL[/tex]

The volume of 0.244 M KCl solution is required 86.07 mL.

Answer:

They dissolved into the water, forming a mixture.

Explanation:

The salt is sodium chloride (NaCl) and the sugar is a dissacharide which contains many hydroxyl  groups (-OH). Both of them are very soluble in water, but they will not start a chemical reaction between themselves.

Dissolving them in water will form a mixture of chloride ions (Cl⁻), sodium ions (Na⁻) and sugar molecules.

Answer:

Pascal is the most common unit for measuring pressure

The average sea level pressure is 1013 mbar

Answer:

Hey! Pascal is the most common unit for measuring pressure. :)\

Explanation:

Answer and explanation:

1. To increases the accuracy of the measurement, the person should try to make sure the ruler is parallel to the object they are measuring. If they measure the object with the ruler not being parallel the measurement will end up larger then expected. To increase the precision the person must measure with the ruler in the same position each time.

2. A situation in which a set of measurements are precise but not accurate could be if a student measured an object at an incorrect angle many times, like the inaccurate measuring in the image above. All of the measurements would be inaccurate, but since they were all measured inaccuratly the same way, they will be precise.

3. An objects mass is defined as being the amount of matter in said object. An objects weight is defined as being the force exerted on an object by gravity. Although the man would weigh less on the Moon because there is less gravity, he still would not fit in his clothes because his mass has not changed.

Answer:

2Al + 3H2SO4 (g) → Al2(SO4)3 (aq) + 3H2 (g)

Explanation:

On the right side we have Al2 ( so 2x aluminium, So  on the left side we multiply Al by 2, On both sides is 2x Al now)

The formula for Sulfuric acid is H2SO4.

The result ( aluminium sulfate ) is Al2(SO4)3. Aluminium has an oxidation number of +3, SO4 has an oxidation number of -2 ( S(+6) + 4O (4x-2) : 6-8 = -2

So we have to multipy aluminium 2x and SO4 (3x) to equal.

On the right side we have 3x S, so on the right side we have to multiply H2SO4 also by 3 to get the same amount.

This results in 12x Oxygen (3xO4). Which is the same as the right side.

On the left side we have 6H ( 3xH2) so on the right side we multiply H2 by 3 to get the same amount.

So we have on both sides:

2x Al

6xH

3xS

12xO

Answer:

(1.45/237) x 6.02x10^23=  0.0368x10^23=3.68x10^21

Explanation:

Final answer:

To find the number of representative particles in 1.45g of a compound with a molar mass of 237g, calculate the moles and multiply by Avogadro's number, resulting in approximately 3.6859 x 10²¹particles.

Explanation:

To calculate the number of representative particles in 1.45g of a molecular compound with a molar mass of 237g, we will first determine the number of moles of the compound using the given mass and then multiply it by Avogadro's number.

Calculate moles: Number of moles = mass (g) / molar mass (g/mol) = 1.45g / 237g/mol.

Multiply by Avogadro's number to find the number of particles: Number of particles = Number of moles x Avogadro's number (6.02 x10²³ particles/mol).

Number of moles = 1.45g / 237g/mol = 0.0061224 mol.

Number of particles = 0.0061224 mol x6.02 x 10²³ particles/mol = 3.6859 x10²¹ particles.

Answer:

Explanation:

The normal boiling point of water is 100°C. That is the temperature at which water boils when the atmospheric pressure is 1 atm, i.e. at sea level.

The liquids boil when its vapor pressure equals the atmospheric pressure; so the higher the atmospheric pressure the higher the boiling point, and the lower the atmospheric pressure the lower the boiling point.

Since, it is stated that the altitude of Denver, Colorado is 1,600 m, the atmosperic pressure (ther pressure exerted by the columnn of air above the place) is lower than 1 atm (atmospheric pressure at sea level).

Hence, water boiling point in Denver is lower than 100°C.

The graphs shown represent the temperature (T °C) as water is heated. Since when liquids boil their temperature remains constant during all the phase change, the flat portion of the graph represents the time during which the substance is boiling.

In the graph A, the flat portion is below 100°C; in the graph B, the flat portion is at 100 °C; in the graph C the flat part is above 100ªC, and, in graph D, there is not flat part. Then, the only graph that can illustrate water boiling in Denver, Colorado is the graph A.

Answer:

C6H1206 + 6O2  > 6CO2  + 6 H2O

Explanation:

On the left side we have  6xC so we multiply CO2 by 6 to get the same amount of C.

We have 12x H on the left side, so we multiply H2O on the right side by 6 to get the same amount of H.

On the right side we have 18x O ( 6CO2 gives us 6x2x O which is 12O; and 6H2O gives us 6O.  To get the same amount on the left side ( we already have 6O in C6H12O6), so we only need 12 O more. So we multiply O2 on the left side by 6. Which gives us 18x O on both sides.

So on both sides we have now:

6x C

12xH

18xO

Answer:

Find the mass of a container.

Add 250 to the quantity and move the brokers to that value.

Add the sugar to the dough container until it reaches zero in the balance.

And ready, you will have the 250 g of sugar.

Explanation:

The triple beam balance is an instrument used to measure the mass quite accurately. This device has an approximate reading error of +/- 0.05 grams. The name refers to the three beams, the largest central beam, the front beam, medium size, and the furthest beam, smallest size. The triple beam balance can be used to measure the mass from objects, find the mass by the difference in the case of a liquid, and measure a substance.

To use a triple beam balance and get 250 grams of sugar, follow the  steps explained below

To use a triple beam balance and get 250 grams of sugar when baking, do these steps:

To start using the triple beam balance, put it on a table or desk that is sturdy and level. Make sure the balance is set up and positioned correctly.

Make sure all three beams are at zero by adjusting the riders or knobs until they line up with the zero marks.

Put a empty container on the weighing scale. If needed, change the zero marks again to include the weight of the container.

Put sugar in the container: Gently add sugar to the measuring container until the balance pointer moves slightly below the zero mark. This means that the sugar is heavier than the counterweight.

Balance the scales: Begin by focusing on the biggest beam (the one with the largest weight that can slide). Shift the heaviness along the long object towards the starting point until the arrow is flat. Do this again for the next two beams. Start with the second biggest beam, and then do the smallest beam.

Adjust the balance carefully: When the pointer is near the zero mark, use the smaller numbers on each side to change the weights until the pointer is perfectly aligned with the zero mark.

Take a look at the measurement: Combine the numbers on each side to find out the total weight of the sugar in grams. The total of the numbers on the beams equals the amount of sugar in the container.

Change the amount of sugar: If you have too much sugar (more than 250 g), take some of it out with a spatula or scoop until you have the right amount. If the weight is less than 250 g, add more sugar until you reach the desired amount.

Read on Baking on https://brainly.com/question/18450456

#SPJ3

Answer:

C

Explanation:

This is the only option that could produce an objective answer through experimentation or studies. The other options can be answered subjectively and are opinion based. They could not be answered scientifically.

The question about how switching from butter to canola oil affects cholesterol levels can be answered scientifically because it involves testable hypotheses and objective data collection.

Among the options provided, the question that can be answered scientifically is

C. how does switching from butter to canola oil affect cholesterol levels in the blood? This is because it poses a question that can be investigated using the scientific method, including forming a hypothesis, conducting experiments, collecting data, and drawing conclusions based on the evidence collected.

Scientific questions often involve understanding natural phenomena, observable events, and the relationships between variables. In comparison, the other questions listed involve personal opinions, morals, or subjective judgments, which are not scientifically testable and depend more on individual or cultural perspectives.

Answer:

On the periodic table, metals are separated from nonmetals by a zig-zag line stepping through carbon, phosphorus, selenium, iodine, and radon. ... Elements just to the left of the line may be termed metalloids or semimetals and have properties intermediate between those of the metals and nonmetals.

Explanation:

Final answer:

Elements are categorized on the periodic table as metals, nonmetals, and metalloids, with metals being lustrous and good conductors, nonmetals being dull and poor conductors, and metalloids exhibiting intermediate properties.

Explanation:

The periodic table organizes elements into categories based on their properties. The main categories are metals, nonmetals, and metalloids (or semimetals). Metals, which occupy the left three-fourths of the periodic table, are generally shiny and silvery, excellent conductors of electricity and heat, and are malleable and ductile. On the contrary, nonmetals are typically found in the upper right-hand corner of the periodic table and tend to be dull, poor conductors of electricity and heat, and brittle in their solid form.

Metalloids, found along the zigzag line between metals and nonmetals, have properties that are intermediate between the two. For example, metalloids are semiconductors due to their unique electrical properties, which are crucial for creating transistors and other solid-state devices.

Answer:

Mitosis is common to all eukaryotes; during this process, a parent cell splits into two genetically identical daughter cells, each of which contains the same number of chromosomes as the parent cell.During meiosis, the cells needed for sexual reproduction divide to produce new cells called gametes.

Answer:

They contain copies of the same cellular components.

They are exact copies of one another.

Explanation:

i just got the answers

Answer: 3.64 hours

Explanation:

Formula of Average speed : [tex]\text{Average speed}=\dfrac{\text{Distance}}{\text{Time}}[/tex]

Given : Distance = 200km    ; Average speed = 55 km/ hr

To find : Time

Substitute values for distance and average speed in the above formula , we get

 [tex]55=\dfrac{200}{\text{Time}}\\\\\Rightarrow\text{Time}=\dfrac{200}{55}=3.63636363636\approx3.64\ hr[/tex]

Hence, it would take 3.64 hours for a car to travel 200km .

Answer:

Chemical properties would be like what you would make food with because you are changing the structure of the ingredients.

Physical properties would be like a chair or the device you asked this question on.

Explanation:

Objects in your home, such as an iron skillet or a plastic water bottle, have both chemical and physical properties. The skillet can rust, which is a chemical property, and is also hard, a physical property. The water bottle is made of polymers (a chemical property) and is also transparent and flexible (physical properties).

Many objects in your home have both chemical and physical properties. For example, an iron skillet has the chemical property of being able to rust when exposed to water and air, a physical property of this skillet is its hardness or rigidity. Similarly, a plastic water bottle has the chemical property of being made up of polymers, which are long chains of repeating molecules, and a physical property would be its transparency or flexibility.

https://brainly.com/question/31835452

#SPJ2

Answer:

Explanation:

Persons body temperature

Answer: Change in air temperature is the independent variable

Explanation:

The independent variable can be defined as the factors that is under control of the experimenter.

There can be changes in the air temperature based on that the temperature of the body will change.

So, in this condition the independent variable is air temperature and dependent variable is body temperature.

The substances in a heterogeneous mixture can usually be seen and are easily separated, exemplified by a mixture of sand and water. Option B is correct.

The substances in a heterogeneous mixture can usually be seen and are easily separated. A heterogeneous mixture consists of two or more substances that are not uniformly distributed, meaning the different components can usually be observed with the uncovered eye.

An example of a heterogeneous mixture is a mixture of sand and water, where the sand can be easily seen and separated from the water by simple means such as filtration.

In contrast, a homogeneous mixture is uniform, meaning its composition is the same throughout, and the different components cannot be seen. Salt dissolved in water is an example of a homogeneous mixture because the salt is evenly distributed within the water and cannot be seen separately.

Hence, B. is the correct option.

Answer:

The liquid must be water.

Explanation:

The liquid must be water because its density (mass/volume) is                    1 grams/cm³

Answer:

Water and acetone is best by separated through distillation

The correct answer would be option C Acetone and water.

Explanation:

When in a mixture of fluid solution, two liquids are mixed in a form of mixture then these liquid can be separated only one method which is based on the fact. That two different liquids will have two different boiling temperatures which method of separating the Fluids is distillation.  

The different liquids that are  present in mixture are boiled and the vapours are condensed and the condensed portion is  accumulated in another beaker.

Answer: 39 electrons

Explanation: Subtract 79 by 40 to get the atomic number (amount of protons) which is 39. The number of electrons must be the same as the number of protons if it's not an ionic compound so the amount of electrons is the same amount of protons.

To find the number of electrons in an atom, identify the atomic number which is equal to the number of protons. Since the mass number is 79 and the isotope has 40 neutrons, the number of protons is 39, meaning an atom of this isotope also has 39 electrons.

In order to find the number of electrons in an isotope of an element, we need to identify the atomic number of the isotope. The atomic number is equal to the number of protons in the nucleus of the atom, which is also equal to the number of electrons in a neutrally charged atom.

The mass number of an isotope is the total number of protons and neutrons in the nucleus. Given that the mass number is 79 and the isotope has 40 neutrons, we can subtract the number of neutrons from the mass number to find the number of protons: 79 - 40 = 39.

Therefore, we can conclude that the volumetric element has 39 electrons. This is because in a neutrally charged atom, the number of electrons equals the number of protons.

https://brainly.com/question/34265383

#SPJ2

Answer:

The frequency of wave is 0.125 Hz.

Explanation:

Frequency:

"It is an event repeat itself in a given period of time"

The unit of frequency is the Hz . If time is measured in seconds then frequency will be in Hz. Hz is equal to the per second.

Formula:

f = 1/ T

f = 1/ 8 sec

f = 0.125 Hz

Van der Waals forces are the strongest force between N2 molecules, and hydrogen bonding is the strongest between NH3 molecules in the solid phase. Option D is correct.

A. This statement is incorrect because N2 molecules are nonpolar and do not exhibit dipole-dipole forces. NH3 molecules are polar and can have dipole-dipole interactions, but this is not the strongest force between them.

B. This option suggests that Van der Waals forces are the strongest between both N2 and NH3 molecules. Van der Waals forces include London dispersion forces, which are the primary intermolecular forces for nonpolar molecules like N2, and dipole-dipole interactions, which NH3 molecules can have due to their polarity. However, hydrogen bonding, which is stronger than dipole-dipole interactions, can occur in NH3.

C. This statement is not accurate because N2 molecules do not have dipole-dipole forces.

D. This option correctly states that Van der Waals forces are the primary forces between N2 molecules (nonpolar), and hydrogen bonding is the strongest force between NH3 molecules due to the presence of hydrogen atoms bonded to highly electronegative nitrogen atoms.

Option D is correct.

For more such question on Van der Waals forces visit:

https://brainly.com/question/18370866

#SPJ6

Answer:

250 mg

Explanation:

1 g = 1000 mg

0.25 x 1000 = 250

0.25 grams is equivalent to 250 milligrams. This conversion is done by multiplying the amount in grams by 1000, which is the conversion factor for grams to milligrams.

The student is asking how to convert grams (g) to other units of mass. In this case, 0.25 grams is equivalent to 250 milligrams (mg). One gram is equivalent to 1000 milligrams, so we can convert the 0.25 grams into milligrams by multiplying by 1000.

To carry out the calculation :

Thus, 0.25 grams (g) is equivalent to 250 milligrams (mg), and so the correct answer is 250 mg. The options stating 0.025 kg and 0.025 mg are incorrect since they portray conversion factors inaccurately. The same applies for the 250 kg option, it is far beyond the original value.

https://brainly.com/question/19420601

#SPJ6

Answer: Would Be A

Explanation:

You would do that because in the scientific method it said make a question, hypothesize and test the idea and make conclusions.

Answer:

the answer is A).

Explanation:

Answer:

B. The theory might be modified if necessary.

B. nearly all scientists agree that it is correct

Explanation:

B. The theory might be modified if necessary.

The Bernoulli's principle relates the speed of fluid to their pressures. It simply states that when the speed of fluids increases there is a drop in pressure.

Supposing we find new evidence about how the principle works, the normal scientific thing to do is to modify the existing principle. New information and observations about a principle would only provide a modification to the existing one. An example is the Dalton's atomic theory, which was centered on the atom being the smallest indivisible particle: the theory was later modified when new ideas about the atom surface.

B. nearly all scientists agree that it is correct

Before a hypothesis is adopted to the context of scientific principle, the ideas behind it must have tested and must be repeatable. Different sources will verify the authenticity of such scientific claim to see if such can be adopted. Therefroe, nearly a large numbr of scientists must agree that it is correct.

Heat or electricity in the atmosphere

Answer:

Option (4)

Explanation:

The Plasma is formed when a gas is heated and becomes very hot. Due to this heating of gas, the atoms within the gas acquires a huge amount of energy. This energy facilitates the electrons to get eliminated from its nucleus of the gas atoms.  

In simple words, plasma is defined as the ionized gas.

These plasma forms more than 99% of the universe that is visible to us. At night, these plasma appears to shine in the form of nebula, stars and auroras that is formed in the atmosphere of both the poles.  

Thus, the plasma are formed due to heating or electricity in the atmosphere.

Hence, the correct answer is option (4).

Answer:

Explanation:

Colloidal:

Suspension: