7. The image shows the effects of exposing the plants to different color of
lights. The size of the plant was measured and the number of leaves were
counted if they are alive or dead. Size of plants and number of leaves are
Size of Plant
Number of Leaves
Living or Dead?
science or
What’s the answer?

An equation is formed of two equal expressions. The value of x in the given equation can be -5.237 or 3.437.

An equation is formed when two equal expressions are equated together with the help of an equal sign '='.

In the given equation, the value of x can be found as shown below,

x²/(0.001 - x) = 1.8 × 10⁻⁴

x²/(0.001 - x) = 1.8/10000

x² · 10000 = (0.001 - x) · 1.8

\(x=\dfrac{-0.00018+\sqrt{0.0000007524}}{2},\:x=\dfrac{-0.00018-\sqrt{0.0000007524}}{2}\)

x = -5.237, 3.437

Hence, the value of x in the given equation can be -5.237 or 3.437.

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Based on the mass ratio of reactants, 23.5 g of sodium nitrate is produced from the reactants.

The mass ratio of a reaction is the ratio of the masses of reactants wilhich combine to form products.

The mass of sodium nitrate is determined from the mass ratio.

The equation of the reaction gives the mass ratio as follows:

NaCl + AgNO3 ----> AgCl + NaNO3

Molar mass of NaCl = 58.5 g

Molar mass of AgNO3 = 170 g

Molar mass of AgCl = 143.5

Molar mass of NaNO3 = 85 g

There are 98 grams of sodium chloride, 47 grams of silver nitrate, therefore silver nitrate is the limiting reactant.

47 grams of silver nitrate will produce 85/170 × 47 = 23.5 g of sodium nitrate.

Therefore, 23.5 g of sodium nitrate is produced from the reactants.

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Answer:

1 and 2

Explanation:

The given equation is:

        Cl₂  +  H₂   →   2HCl

A coefficient is the variable or number before a chemical specie.

In this reaction Cl₂ and H₂ are the reactants;

  The coefficient of Cl₂ is 1,

                                   H₂ is 1,

                                  HCl is 2

The subscript is the number to the lower power after a chemical specie is denoted.

    For Cl₂, it is 2

A number before a chemical atom or molecule is called a coefficient. The coefficient of chlorine is one (1), and its subscript is two (2).

A subscript is a number or symbol written at the bottom right of the chemical atom or the molecule in a compound.

The balanced chemical reaction is shown as:

\(\rm Cl_{2} + H_{2} \rightarrow 2HCl\)

The coefficient in chlorine is 1, hydrogen is 1, and hydrochloric acid is 2. The subscript in chlorine gas is 2, and hydrogen gas is 2.

Therefore, the coefficient is 1, and the subscript is 2.

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Answer:

HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.

Explanation:

HNNH has the strongest and shorter nitrogen-nitrogen bond.

We know in chemistry that the shorter a bond is, the stronger is. Also, a triple bond is shorter than a double bond and a double bond is shorter than a single bond.

Having said that, we know that HNNH contains a nitrogen - nitrogen triple bond while H2NNH2 contains a nitrogen - nitrogen single bond.

Since a triple bond is shorter and stronger than a single bond,  HNNH has the strongest and shorter nitrogen-nitrogen bond.

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Answer:

Option d) 3 only is the right answer

Answer:

Atomic weight of Hydrogen is 1. There are 2 Hydrogen atoms in water molecule. So it is 2. Oxygen atomic weight is 16.0 and adding 2 and 16, we will get 18.18 is the equivalent weight of water.

Explanation:

Hope this helps

The correct equation for solving for the temperature at which a reaction becomes spontaneous is AH - AS.

This equation is based on the equation for Gibbs Free Energy, which states that AG = AH - TS. In this equation, AG is the Gibbs Free Energy, AH is the enthalpy, T is temperature, and S is the entropy.

Therefore, if one knows the enthalpy and the entropy of a reaction, then one can calculate the temperature at which the reaction becomes spontaneous by subtracting the entropy from the enthalpy. This is because, at a given temperature, a reaction is spontaneous if the Gibbs Free Energy is negative.

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Answer:

Compound

Explanation:

SiO2 is silicon dioxide which is a compound.

In descending order

Halogen

Non metal

Noble Gas

Halogen

Non metal

The name of the product isotope formed when Radon-222 decays by alpha decay is polonium-218.

Alpha particles, also known as alpha rays or alpha radiation, are made up of two protons and two neutrons bonded together to form a helium-4 nucleus like particle.

As Radon-222 is an unstable radioactive substance and will do radioactive decay by the emission of alpha particle and as a result of which it produces a isotope polonium-218 isotope. As these two have same atomic number but different atomic masses.

Hence formed product isotope is polonium-218.

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24. The IUPAC name of the compound is 2,4-dimethyl-1-pentanal (Option B)

25. The IUPAC name of the compound is 5-methyl-3-octanone (Option C)

The international union of pure and applied chemistry (IUPAC) standard for naming organic compounds is given below:

24. The name of the compound is given as follow:

Thus, the IUPAC name of the compound is:

2,4-dimethyl-1-pentanal (Option B)

25. The name of the compound is given as follow:

Thus, the IUPAC name of the compound is:

5-methyl-3-octanone (Option C)

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Answer:

A

Explanation:

I sad A because water is changeable doesn't have fixed shape or volume water depend on the area or the temperature or other things .

Answer:0.802atm

Explanation:

To convert pressure from millimeters of mercury (mmHg) to atmospheres (atm), you can use the conversion factor:

1 atm = 760 mmHg

So, to convert the pressure of the light bulb from mmHg to atm, divide the given pressure by 760:

Pressure (in atm) = 610 mmHg / 760 mmHg

Pressure (in atm) ≈ 0.802 atm

Therefore, the pressure inside the light bulb is approximately 0.802 atmosphe

Answer:

One possible answer could be lemon juice

Explanation:

We had to do a water test, and I was looking up what pH levels were. Then I learned about it in school, so I know a thing or two about it :)

Possible other answers include stomach acid and cola.

Hope this helps!!

Answer:b zinc ,d=7.14g/

Explanation:

Answer:

2

Explanation:

Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.  

Peer reviews are used by scientists to ensure objectivity and reduce prejudice in their study. To create original ideas and hypotheses, scientists need both logical reasoning and creative thinking.

As scientists frequently interact, exchange ideas, and build on one another's work, it is a complex social endeavour. Understanding and making sense of the natural world is the central tenet of science.

Finally, scientists separate their personal beliefs from empirical evidence in order to stay as objective as possible in their research.

Thus, Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.  

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The pressure of the environment affects the liquid's boiling point. The boiling point of the liquid is higher when it is under high pressure than when it is under normal atmospheric pressure. For a given pressure, various liquids have different boiling points.

The temperature at which a liquid's vapour pressure equals the surrounding atmosphere is known as the boiling point of the liquid. This temperature causes the liquid to become a vapour.

The temperature of the liquid, the pressure of the atmosphere, and the pressure of the vapour all affect its boiling point.

We know that change in temperature of a system is given by the following formula:

Initial boiling point (T₁) = 80.1 °C

ΔT = T₂ - T₁

2.25 = T₂ - 80.1

T₂ = 82.35  °C

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Answer:

82.35

Explanation:

acellus

Answer:

Your body can cool itself by sweating. When sweat evaporates, it lowers your temperature

Explanation:

The answer is D) 200 cal (rounded to the nearest whole number).Temperature plays an important role in many physical and chemical processes, including thermal expansion, heat transfer, phase changes, and chemical reactions.

What is Temperature?

It describes how hot or cold an object or environment is relative to some standard or reference point. The standard reference point for temperature measurement is typically the freezing and boiling points of water at sea level, where water freezes at 0 degrees Celsius (32 degrees Fahrenheit) .

The amount of heat (in calories) required to change the temperature of a substance is given by the formula:

Q = m * c * ΔT

Substituting the given values, we get:

Q = 25.5 g * 0.450 J/g oC * (83.2 oC - 22.5 oC)

Q = 25.5 g * 0.450 J/g oC * 60.7 oC

Q = 826.3075 J

To convert this to calories, we can use the conversion factor 1 cal = 4.184 J:

Q = 826.3075 J * (1 cal/4.184 J)

Q = 197.1 cal

Therefore, the answer is D) 200 cal (rounded to the nearest whole number).

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Hi there! Answer is below :)

Explanation:

For this question, we apply Boyle's Law and Charles' Law.

When you double the amount of pressure and temperature of a compound or mixture, the volume will decrease by a half. So, if the pressure and temperature are 2, and the volume is 1, and you double, your volume will be 0.5 and your pressure and temperature will be 4.

Best of Luck!

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Answer:

A. 444.5 pm

Explanation:

We know that:

\(Density = \dfrac{mass \ of \ atoms \ in \ unit \ cell}{total \ volume \ of \ unit \ cell}\)

i.e.

\(\rho = \dfrac{n*M}{v_c * N_A}\)

\(\rho = \dfrac{n*M}{a^3 * N_A}\)

in a face-centered cubic crystal, the number of atoms per unit cell is (n) = 4

The molar mass of manganese (II) oxide \([Mn(11)O] = 70.93 \ g/mol\)

Density \(\rho\) is given as 5.365 g/cm³

Avogadro constant \(N_A\) = 6.023 × 10²³ atoms/mol

∴

\(\rho = \dfrac{n*M}{a^3 * N_A}\)

Making th edge length "a" the subject, we get:

\(a^3 = \dfrac{n*M}{\rho* N_A}\)

\(a^3 = \dfrac{4*70.93 \ g/mol}{5.365 \ g/cm^3 *6.023 * 10^{23} \ atoms/mol }\)

\(a^3= 8.78 \times 10^{-23} \ cm^3\)

\(a= \sqrt[3]{8.78 \times 10^{-23} \ cm^3}\)

a = 4.445 × 10⁻⁸ cm

a = 444.5 pm

The unit cell edge length of manganosite is equal to: A. 444.5 pm

Given the following data:

We know that the molar mass of manganese (ll) oxide is equal to 70.93 g/mol.

Avogadro constant = \(6.02 \times 10^{23}\)

Since the rock salt is face-centered cubic crystal, the number of atoms per unit cell, n = 4

To find the unit cell edge length of manganosite:

For a crystal structure, density is given by the formula:

\(Density = \frac{Mass\; of\;atoms\;in\;a\;unit\;cell}{Total\;volume\;of\;a\;unit\;cell}\)

\(\rho = \frac{nM}{N_Aa^3}\)

Where:

Making "a" the subject of formula, we have:

\(a=\sqrt[3]{\frac{nM}{\rho N_A} }\)

Substituting the parameters into the formula, we have;

\(a=\sqrt[3]{\frac{4 \times 70.93}{5.365 \times 6.02 \times 10^{23} }}\\\\a=\sqrt[3]{\frac{283.72}{3.23 \times 10^{24} }}\\\\a=\sqrt[3]{8.79 \times 10^{-23} }}\\\\a = 4.445 \times 10^{-8}\; meters\)

Unit cell edge length, a = 444.5 pm

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The balanced chemical equation for the complete combustion of propan-2-ol (also known as isopropanol) is: C₃H₈O + 5O₂ → 3CO₂ + 4H₂O.

Complete combustion is a chemical reaction between a fuel and an oxidant that produces only carbon dioxide and water vapor as the products. In other words, in complete combustion, all of the fuel is burned completely, producing the maximum amount of heat and light energy. The general equation for complete combustion of a hydrocarbon fuel is: hydrocarbon + oxygen → carbon dioxide + water. In this reaction, methane reacts with oxygen to produce carbon dioxide and water vapor. This reaction is exothermic, meaning it releases heat energy, and it is used in many applications such as heating and energy production. Complete combustion is different from incomplete combustion, where the fuel is not burned completely and other products such as carbon monoxide (CO) and unburned hydrocarbons are produced. Incomplete combustion is generally less efficient and can produce harmful pollutants.

Here,

This equation shows that one molecule of propan-2-ol reacts with five molecules of oxygen gas to produce three molecules of carbon dioxide and four molecules of water vapor. This reaction releases energy in the form of heat and light and is a common way of producing energy from organic fuels. The balanced equation shows that the number of atoms of each element is the same on both sides of the equation, which is a requirement for a balanced chemical equation.

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Answer:

4.0473g. Attached in image are the calculations I used to reach this answer.

Molecular substances tend to be gases because the intermolecular forces of attraction are comparatively weak. You don't have to break any covalent bonds in order to melt or boil a molecular substance.

The longest intermolecular separation and hence the strongest intermolecular pressure of attraction can be found in the gaseous state of matter.

Although solids' intermolecular interactions were sufficient to maintain themselves in locked places, gases often have weak intermolecular forces that cause them to remain considerably separated. The gases possess greater intermolecular space than solids as a result of these weak forces.

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The fingerprint region is the right term for this area. The IR spectrum of a molecule is a graphical depiction of the vibrational frequencies of the molecule's bonds.

The fingerprint area is the portion of the IR spectra between 1,000 and 400 cm-1 that is frequently used to distinguish between identical molecules with the same functional groups. This is due to the fact that each molecule has a unique bond configuration, which results in a unique set of vibrational frequencies.The fingerprint region is the right term for this area. The IR spectrum of a molecule is a graphical depiction of the vibrational frequencies of the molecule's bonds.  It is possible to identify individual molecules and distinguish between similar ones by studying the peaks in the fingerprint area.The remaining areas indicated, the downfield, functional group, and Ri regions, are not typically used to define the IR spectrum.

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thefunctionalgroupregion These are often connected to functional group stretching vibrationsA functional group's stretching vibrations are restricted to a small range

Functional connection is defined as the geographically dispersed neurophysiological events' temporal coherence (Friston, 1994). In other words, if there is a statistical link between the activity measurements that have been recorded for two areas, then those two regions are said to exhibit functional connectivity. This connection strategy is based on the idea that if two regions' functional activity is regularly associated, then those two areas are assumed to be connected or to be parts of the same network Functional connectivity is a considerably more direct method of analysing functional networks than effective connectivity studies, which rely on a number of assumptions about the underlying neurobiology and the model used to predict it. Particularly it is in agreement with the intuitive

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Answer:

8.54g

Explanation:

we know that: n=m/Mm

where:

rearrange for m: m= n x Mm

m= 0.0490mol x 174.259g/mol

m= 8.54g