A farmer wants to know if a new pesticide will produce better tomatoes than
his old pesticide. Which of the following is the best hypothesis to use to
address his question?
O
A. Using the new pesticide makes the tomato plants grow taller than
using the old pesticide.
O
B. Using the new pesticide is better for the environment than using
the old pesticide.
O
C. Using the new pesticide is less expensive than using the old
pesticide.
O
D. Using the new pesticide produces bigger tomatoes than using the
old pesticide.

Answer: Decreased temperatures and increased salinity. Colder water is denser than warm water and the higher the salinity of water the denser it is.

Answer:

D. decreased temperature and increased salinity

Explanation:

Edge Correct Answer

Answer: Dependent variable

Explanation:

The dependent variable  in an experiment brings the result of the experiment. The independent variable are the factors that is being controlled by the experimenter.

The dependent variable is basically the aim of the experiment. So, it needs to be measured in order to obtain a result.

The dependent variable is dependent on the independent variable. Hence, to obtain data of the experiment dependent variable is observed.

Answer:

mass ratio of A/B is 2:1

Explanation:

Since the mass of box A = 10g

                mass of box B = 5g

   Mass of box C = mass of box A + mass of box

A ratio compares two quantities. To find the ratio of the two boxes:

  Ratio of A to B = [tex]\frac{mass of A}{mass of B}[/tex]

  Ratio of A to B = [tex]\frac{10grams}{5grams}[/tex] = 2

The mass ratio is 2:1 i.e box A has twice the mass of B

Answer:

15?

Explanation:

Cause 10+5 is 15 and that’s all I have

Answer: True

Explanation: What this means is that like a cookbook, people misinterpret it as very simple, taking out the problem, bringing an observation then mixing in a few questions, sprinkling a hypothesis put it all in an experiment and the conclusion would just POP OUT OF THE OVEN. But it’s not as simple as that.

Answer:

B. 5.0 x 10^(-23)

Explanation:

m= n × MM

where

m is mass

n is moles

MM is molecular mass

One molecule of a substance is 1/ 6.022 ×10^23 moles

The molecular mass of C2H6 is the sum of the atomic masses of each of the atoms present in the molecule. 2 carbon atoms + 6 hydrogen atoms. This gives

30.07.

So m= (1/(6.022×10^23)) × 30.07 = 5.0 ×10^(-23)

Mass of a substance can be calculated by using the formula:

Mass (m) = moles (n)  ×  Molar mass (M)

The correct answer is:

Option B. 5.0 × 10²³

Explanation for this is:

       = 2(12) + 6(1)

       = 24+6

       = 30

       = 5.0 × 10²³gm

Therefore, 5.0 × 10²³ gm is the mass of one molecule of ethane.

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The electronic configuration of Be(beryllium) is [tex]1s^{2} 2s^{2}[/tex], C = 2 and D = 2.

The placement of electrons all around nuclei of a specific atom or molecule would be known as its electronic configuration.

The Be atom is a kind of atom which have 4 electrons.

The electronic configuration of Be is  [tex]1s^{2} 2s^{2}[/tex]. Therefore, C = 2 and D = 2.

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Answer:

D. A new substance with properties different from either of the liquids was formed.

Explanation:

This is a simple chemical reaction. When chemical reactions occur, bonds are simply broken and rearranged and new ones formed. Formation of new compounds can be seen and clearly observed. These compounds are completely different in properties from the atoms and compounds that combines to form them.

If they still share the same property in anyway, then, there was only a physical combination of the compounds and this implies the formation of a mixture

Answer:

D. A new substance with properties different from either of the liquids was formed.

The correct option that is the answer for the question is option d

Explanation:

In the given question two liquids of different colours are mixed together. One of them has yellow colour, while the other is colourless on mixing we see that the new substance that is formed is neither yellow nor colourless.

And the mixture that is formed is a substance which is not liquid and solid of red colour and we can conclude, that the mixture form does not retain any property of the elements from which it is made. Hence we can say a new substance with different properties are formed.

Answer:

The amount of heat require to melt the gold is 1290 J.

Explanation:

Formula:

Q = m × Lf

Q = heat required to melt the substance

m = mass of given substance

Lf = Latent heat of fusion

Given data:

Lf = 64.5 j/g

m = 20 g

Q = ?

Now we will put the values in formula.

Q = m × Lf

Q =  20 g × 64.5 j/g

Q = 1290 J

The amount of heat require to melt the gold is 1290 J.

Answer:

The amount of heat require to melt the gold is 1290 J.

Explanation:

Answer:

is 4

Explanation:

                      Fe + 3O₂ → 2Fe₂O₃

The law of conservation of mass states that "matter is neither created or destroyed in a system". Now, by careful inspection of the atoms reacting and the product formed, we see that the equation is not balanced.

Fe on reactant side is 1 but 4 on the product side. To balance it up, we simply put 4 as the coefficient behind the iron atoms.

                              4Fe + 3O₂ → 2Fe₂O₃

Answer:

4

Explanation:

TRUST ME

Answer:

The fundamental forces or interactions is a term used in physics that explains the Forces that present in nature in their most basic form and cannot be further reduced.

Explanation:

The force of gravitation and the subatomic forces present inside the atom also known as some nuclear reactions and electromagnetic reaction are certain examples of fundamental forces.  all these forces are in their basic form of nature.

These  all make four such forces while another fifth force is a hypothetical one and is believed to be in existence hypothetically by the scientists.

Answer:

b. data is the information that proves all hypotheses are correct

Explanation:

Data is important to scientific endeavors as it is the information which supports or does not support a certain hypothesis someone has about a certain theory, data will generate further ways to support that theory or oppose it, in both cases the basic resource which a scientific endeavor needs is data

Answer:

We are giving that 12 inches make one foot and 1 inch is equivalent to [tex]2.54 cm.[/tex]

Of the given inches in centimetre will be [tex]148. 38 cm^2.[/tex]

Explanation:

Now the value that is given in inches square is 23, to calculate the value of inches given in the question into centimetre we have to multiply the value of inch with [tex]2.54 cm.[/tex]

[tex]23 \times 2.54 \times 2.54= 148.38 cm^2[/tex]

Since the value is given in square hence the centimetre calculated would also be in square that is why [tex]2.54[/tex] needs to be multiplied twice.

Final answer:

To convert 23 in2 to cm2, divide by 144 (to convert to square feet) and then multiply by the conversion factor for square feet to square centimeters.

Explanation:

To convert 23 in2 to cm2, we need to use the given conversion factor of 1 in = 2.54 cm. First, let's convert the square inches to square feet by dividing by 144 (since there are 12 inches in a foot). So, 23 in2 = 23/144 ft2. Next, convert the square feet to square centimeters by multiplying by the conversion factor of 1 ft2 = 929.0304 cm2. Therefore, 23 in2 is equal to (23/144) * 929.0304 cm2 = 18.64162 cm2 (rounded to five decimal places).

Answer:

The cell that helps provide the energy for mitosis is Process of cell division that results in to identical daughter cells.

To convert 0.063 liters into milliliters, 0.063 will be multiplied by 1000 which will give 63 milliliters.

The question asks how many milliliters are in 0.063 liters. To convert liters to milliliters, we use the conversion factor that 1 liter is equal to 1000 milliliters. Since we are converting from a larger unit (liters) to a smaller unit (milliliters), we need to multiply.

To find the answer, we multiply 0.063 liters by 1000 milliliters/liter:

Therefore, 0.063 liters is equal to 63 milliliters.

Answer: Air, sea water, and carbonation dissolved in soda are all examples of homogeneous mixtures, or solutions. Hope this helps :)

Answer:

The ratio of the metal to oxygen is 2:1

Explanation:

Given parameters:

Number of moles of unknown metals = 0.48moles

Number of moles of oxygen = 0.24moles

To find the mole ratio:

We divide the given moles by the smallest values. This gives the simplest form of the two elements:

    Elements                          Unkown metal                Oxygen

Number of moles                      0.48                              0.24

simplest form                          0.48/0.24                   0.24/0.24

                                                       2                                    1

The ratio of the metal to oxygen is 2:1

The mole ratio of an unknown metal to oxygen, given 0.480 moles of the metal and 0.240 moles of oxygen, is 2:1. This ratio was calculated by dividing the number of moles of the metal by the number of moles of oxygen.

The mole ratio of metal to oxygen can be determined by dividing the number of moles of each element by each other. In this case, we are given that there are 0.480 moles of an unknown metal and 0.240 moles of oxygen. To find the mole ratio, we divide the moles of the metal by the moles of oxygen:

Mole ratio = moles of metal / moles of oxygen = 0.480 moles / 0.240 moles = 2:1.

This means for every 2 moles of the metal, there is 1 mole of oxygen, which is the required mole ratio of metal to oxygen.

Answer:

Explanation:

"Three hundred ten million, seven hundred sixty-three thousand, one hundred thirty-six".

Answer:"Three hundred ten million, seven hundred sixty-three thousand, one hundred thirty-six".

Explanation:

Answer:

PCl₃  

Explanation:

If a molecule contains one P atom and three Cl atoms, its formula must be PCl₃.

A is wrong, because the formula PCl means one atom of P and one of Cl.

C and D are wrong, because the formula P₃Cl indicates a molecule consisting of three P atoms and one Cl atom.

Answer:

PCl sub-3

Explanation:

just checked!!!

Answer:

The type of vegetation a surface does affect the water coming from above to sink in or runoff.

Explanation:

This is how the vegetation affects the runoff:-

The leaves and stems present in the vegetation do not let the water fall directly on the soil and makes the process rather slow which makes the water to get to the ground slowly and sink in properly inside the soil rather than running off.

If the vegetation present is dense with  there was being hairy then also the water would not run out and will get absorbed by the roots letting the soil intact

Answer:

The answer is the toaster and the room heater.

Explanation:

Both objects are powered by electricity in order to heat things, such as bread and people.

Hope this helps!

Answer:

Option (2)

Explanation:

The process by which one type of energy is transformed into another type is known as the conversion of energy . The changing of electrical energy to thermal energy is an example of energy conversion.

The room heaters are used to heat the room, maintaining a certain room temperature, and a toaster is used to make toasts. Both the room heater and the toaster are the two things from the given options that are used widely and it converts energy, from electrical to thermal energy.

Thus, the correct answer is option (2).

Answer:

d) A positive charge  

Explanation:

This is the definition of a proton: a particle in the nucleus that has a positive charge .

Answer:The pure substance within chemistry is a very simple concept to grasp. Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together). ... Purity can also have an important impact on the chemical properties of a substance.

Explanation:

A pure substance is a material with a fixed chemical composition, and it can be either an element or a chemical compound. It exhibits specific melting and boiling points, and chromatography reveals its pure status. While absolute purity is rare, highly pure substances are used in specialized industries.

A pure substance is a material that consists entirely of one type of matter with a fixed chemical composition. It can be classified as an element or a chemical compound. For example, oxygen is composed only of oxygen atoms, making it a pure substance. Similarly, water (H2O) is a pure substance because it is always composed of two hydrogen atoms bonded to one oxygen atom in a fixed ratio.

To determine the purity of a substance, scientists use techniques like melting and boiling point analysis, and chromatography. Pure substances have distinct melting and boiling points, unlike mixtures which melt or boil over a range of temperatures. Chromatography, on the other hand, separates a substance into its components; if only one component is present, the substance is pure.

Attaining absolute purity is challenging, but in specialized applications such as semiconductor manufacturing, materials approach near-absolute purity, like hyperpure water. The concept of purity is fundamental in understanding the properties and behaviors of substances in chemistry.

Complete question:

What is a pure substance ?

Explanation:

All boron isotopes have 5 protons.

B11 has 6 neutrons, so its atomic mass is:

6 (1.008664 u) + 5 (1.007276 u) = 11.0884 u

B10 has 5 neutrons, so its atomic mass is:

5 (1.008664 u) + 5 (1.007276 u) = 10.0797 u

So the average atomic mass of boron is:

0.80 (11.0884 u) + 0.20 (10.0797 u) = 10.8866 u

The closest whole number is 11.

Answer:

number of protons =17

number of neutrons=20

number of electrons=17

Atomic number is the same as proton number

To find the neutrons

subtract the atomic number from the mass number

thus, Neutrons =Mass number - Atomic number

Neutrons=37-17

Neutrons=20

An atom of a chlorine has an atomic number of 17and a mass number of 37 . The number of protons =17 ; number of neutrons=20; number of electrons=17

The Atomic number of an element is the same as proton number

And, To find the number of  neutrons we need to subtract the atomic number from the mass number

given,

atomic number =17

mass number= 37

thus, Number of  Neutrons =Mass number - Atomic number

Number of Neutrons=37-17

number of Neutrons=20

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Answer:

yes that is the name for the formula is magnesium diiodide

False, The formula MgI₂ is correctly named magnesium iodide, not magnesium diiodide. The naming convention for ionic compounds doesn't require prefixes when the simplest ratio of ions is used in the name.

The statement that the name for the formula MgI₂ is magnesium diiodide is FALSE. The correct name for MgI₂ is magnesium iodide. The naming convention for binary ionic compounds involves combining the cation name with the anion name.

Since the magnesium ion has a charge of +2 (Mg²⁺) and each iodide anion has a charge of -1 (I-), two iodide ions are needed to balance the charge of one magnesium ion. However, the prefix 'di' is not necessary in this case because the convention is to use the simplest ratio of ions which is assumed in the name. Thus, for MgI₂, we simply say magnesium iodide.

Turning to other examples to explain how the nomenclature works for binary ionic compounds, magnesium oxide has the formula MgO, which tells us there is a 1:1 ratio of magnesium ions to oxide ions. Similarly, MgCl₂ is called magnesium chloride, indicating there are two chloride ions for every one magnesium ion to balance the charges, resulting in no prefixes being used in the name.

Answer:

10.836 × 10∧23 atoms

Explanation:

The mole is the unit of amount in chemistry. We know that

1 mole of silicon = 6.02× 10∧23 atoms

The number 6.02× 10∧23 is called Avogadro's number.

Definition:

" Avogadro's number is the number of molecules atoms or ions in one gram molecule of a compound, one gram atom of an element or one gram ions of a substance"

For example:

1 g of hydrogen = 1 mole of hydrogen = 6.02× 10∧23 atoms of hydrogen

18 g of water= 1 mole of water= 6.02× 10∧23 molecules of water

Given data:

moles of sulfur= 1.8 mol

number of atoms= ?

Solution:

one mole of silicon=  6.02 × 10∧23

1.8 × 6.02× 10∧23 = 10.836 × 10∧23 atoms

Explanation:

According to the mole concept there are [tex]6.022 \times 10^{23} atoms[/tex] present in 1 mole of a substance.

Mathematically,    1 mole = [tex]6.022 \times 10^{23}[/tex] atoms or molecules

Therefore, number of atoms of silicon present in 1.8 mol of silicon are as follows.

          [tex]1.8 mol \times 6.022 \times 10^{23}}atoms /mol[/tex]

                 = [tex]10.83 \times 10^{23}[/tex] atoms

Thus, we can conclude that there are [tex]10.83 \times 10^{23}[/tex] atoms of silicon are present in 1.8 mol of silicon.

Answer:

D

Explanation:

Answer:

The correct answer is D; the new substance produced is a precipitate.

Explanation:

Essentially what happened was the two liquids could not mix (insolubility), so a white powder settled at the bottom, which is called a precipitate (residue). This is evidence of chemical change and chemical reaction.

Answer:

[tex]$\Delta x . \Delta p \geq \frac{h}{4 \pi}$[/tex]

∆x is the Uncertainty in the position of the particle

∆p is the Uncertainty in the momentum of the particle

[tex]$\Delta p=\frac{h}{4 \pi \times m \times \Delta x}$[/tex]

[tex]$=\frac{6.626 \times 10^{-34} \mathrm{kgm}^{2} s^{-1}}{4 \times 3.14 \times 9.109 \times 10^{-31} \mathrm{kg} \times 471 \times 10^{-12} \mathrm{m}}$[/tex]

[tex]$=\frac{6.626 \times 10^{-34} \mathrm{ms}^{-1}}{53887 \times 10^{-43}}$[/tex]

[tex]=1.23\times10^5 ms^{-1}[/tex] is the answer

Answer:

Sr²⁺

Explanation:

Krypton has 36 electrons and an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6. An ion with a charge of 2+ and 36 electrons is Sr²⁺. Since it has the same amount of electrons, Sr²⁺ also has an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6.

The formula of the ion is Sr²⁺

From the periodic table, we understood that Krypton (Kr) has 36 electrons.

From the question given above, we were told that the ion has the same electronic configuration as krypton. Thus,

The ion also have 36 electrons.

Finally, we shall determine the number of protons in the ion in order to determine the element that form the ion and also the symbol of the element.

Electrons in the ion = 36

Charge on ion = +2

2 = Proton – 36

Collect like terms

Proton = 2 + 36

Considering the period table, the element with 38 protons (i.e atomic number of 38) is strontium with symbol Sr.

Therefore, the formula of the ion with the same electron configuration as krypton is Sr²⁺

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Answer:

One sulfur atom

Explanation:

The compound ZnSO₄ is made up of:

       1 atom of Zn

       1 atom of S

       4 atoms of O

These atoms combines chemically to form the above compound. The coefficient 3 before the compound only shows the number of moles of the compound that are there. Most times, the coefficient balances the chemical equation.

Therefore, we can say 3 moles of ZnSO₄ consists of 1 atom of Zn, 1 atom of S and 4 atoms of Oxygen.