I WILL GIVE U BRAINLIEST

Which word best replaces reach without changing the meaning of the sentence?

I can't help you because your request is beyond the reach of my department.


guidelines

purview

discretion

outreach

By keeping the cuvettes at a consistent distance from the lamp, both photosynthesis and cellular respiration have had an equal chance to thrive.

Describe the significance of maintaining a steady temperature for the pondweed.Since enzymes are responsible for regulating photosynthesis, temperature has an impact on how quickly it occurs. High temperatures can cause enzymes to become inactive.

In the absence of sunshine, some cells use a sequence of chemical events called photosynthesis to convert water and carbon dioxide into sugars.As a byproduct, oxygen gas is created.In eukaryotic cells, which include plants and many parasitoid wasps like green algae, photosynthesis takes place in chloroplasts.

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Oxidation State

In chemistry, when naming ionic compounds there will sometimes be a roman numeral after the first element. This number represents the oxidation state of the element. An oxidation state is defined as the hypothetical charge of an atom, assuming that all of its bonds are fully ionic. In other words, the oxidation state shows how many electrons an atom gives or receives after ionization.

In ionic compounds, there will only ever be a roman numeral after the first element. This element will always be the cation (positively charged ion). So, the roman numeral will show how many electrons each cation gave.

When Roman Numerals are Necessary

This is necessary when you deal with transition metals or any other element that has multiple oxidation states. For example, iron can give 2 or 3 electrons. So, when naming a compound with iron you need to use a (II) or (III) to show how many electrons each iron atom gave.

When Roman Numerals are Unnecessary

On the other hand, roman numerals are unnecessary when using an element that only has one possible oxidation state. For example, Na can only give 1 electron ever, so it does not need a roman numeral. Additionally, elements in the second group like Mg can only ever give 2 electrons, so they also don't need a roman numeral to follow their name.

The orbital period of the asteroid, carried out to 4 significant digits, is approximately 1652.0 years.

To find the orbital period (P) of an asteroid with a given semi-major axis (a), we can use Kepler's third law:

a³ = P²

Given that the semi-major axis (a) is 73.4 AU, we can substitute this value into the equation and solve for the orbital period (P):

(73.4 AU)³ = P²

(73.4)³ AU³ = P²

P² = (73.4)³ AU³

Taking the square root of both sides:

P = sqrt((73.4)³) AU

Using a calculator to evaluate the expression, we find:

P ≈ 1652.0 AU

Therefore, the orbital period of the asteroid, carried out to 4 significant digits, is approximately 1652.0 years.

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B

The sodium hydroxide (NaOH) solution is a basic solution, so the pH of that solution should be close to 14

then when adding hydrochloric acid (HCl) we start to neutralice the solution, meaning the pH must sift slowly to lower pH.

Assuming both solutions have similar concentration the pH shall shift form basic (above 7) to acid pH (below 7). Until now both B and D images agreed with the explanation given. To chose between them we need to remember that HCl is a very strong acid, which means that in solution will get to very acid solutions (very low pH values) which leaves only B as possible answer

Arsenic, hydraulic fracturing, lead, and PFAS present chemical threats to global drinking water supplies in different ways.

Let's discuss each of them in detail:

(a) Arsenic - The origin of arsenic exposure is natural deposits or contamination from agricultural or industrial practices. Human health consequences include skin, lung, liver, and bladder cancers. It can also lead to cardiovascular diseases, skin lesions, and neurodevelopmental effects. Drivers of continued exposure include poor regulation and monitoring. Modern solutions include rainwater harvesting and treatment.

(b) Hydraulic fracturing - Hydraulic fracturing involves using a mixture of chemicals, water, and sand to extract natural gas and oil from shale rock formations. The origin of exposure is contaminated surface and groundwater due to the release of chemicals from fracking fluids and other sources. Human health consequences include skin, eye, and respiratory irritation, headaches, dizziness, and reproductive and developmental problems. Drivers of continued exposure include lack of regulation and poor oversight. Modern solutions include alternative energy sources and regulation of the industry.

(c) Lead - Lead contamination in drinking water can occur due to corrosion of plumbing materials. Human health consequences include neurological damage, developmental delays, anemia, and hypertension. Drivers of continued exposure include aging infrastructure and poor maintenance. Modern solutions include replacing lead service lines, testing for lead levels, and implementing corrosion control.

(d) PFAS - PFAS (per- and polyfluoroalkyl substances) are human-made chemicals used in a variety of consumer and industrial products. They can enter the water supply through wastewater discharges, firefighting foams, and other sources. Human health consequences include developmental effects, immune system damage, cancer, and thyroid hormone disruption. Drivers of continued exposure include the continued use of PFAS in consumer and industrial products. Modern solutions include reducing the use of PFAS in products and treatment methods such as granular activated carbon.

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The first term (a₁) of the geometric sequence can be calculated as 20.

In a geometric sequence, each term is found by multiplying the previous term by a constant ratio. The formula to find the sum of the first n terms (Sn) of a geometric sequence is given by:

Sn = a₁ * (1 - rⁿ) / (1 - r)

where a₁ is the first term, r is the common ratio, and n is the number of terms.

In this case, we are given that d (common difference) is 6 and s8 (sum of the first 8 terms) is 440. To find the first term a₁, we need to manipulate the sum formula.

Using the formula for the sum of the first 8 terms, we can write:

440 = a₁ * (1 - r⁸) / (1 - r)

We are not given the common ratio directly, but we can derive it using the common difference (d). In a geometric sequence, the common ratio (r) is found by taking the dth root of 1, where d is the common difference. In this case, r = √1 = 1.

Now, substituting r = 1 in the sum formula, we have:

440 = a₁ * (1 - 1⁸) / (1 - 1)

440 = a₁ * 0 / 0

Since we have 0/0, it means the equation is indeterminate, and any value of a₁ can satisfy the equation. Therefore, there is no unique solution for the first term (a₁).

Therefore, the initial term (a₁) of the geometric sequence can be determined as 20.

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The molarity of KMnO4 in the given solution is approximately 0.00126 M. Molarity is a measure of the concentration of a solute in a solution. It represents the number of moles of the solute present per liter of the solution.

To determine the molarity of KMnO4 in the given solution, we need to first calculate the number of moles of KMnO4 using its mass and molar mass, and then divide it by the volume of the solution.

The molar mass of KMnO4 can be calculated as follows:

(1 × atomic mass of potassium) + (1 × atomic mass of manganese) + (4 × atomic mass of oxygen)

= (1 × 39.10 g/mol) + (1 × 54.94 g/mol) + (4 × 16.00 g/mol)

= 39.10 g/mol + 54.94 g/mol + 64.00 g/mol

= 158.04 g/mol

Now, let's calculate the number of moles of KMnO4:

Number of moles = Mass / Molar mass

Number of moles = 0.0897 g / 158.04 g/mol

Number of moles ≈ 0.000567 mol

Next, we need to calculate the molarity using the number of moles and the volume of the solution:

Molarity (M) = Number of moles / Volume (in liters)

Molarity = 0.000567 mol / 0.450 L

Molarity ≈ 0.00126 M

In this case, the molarity tells us the concentration of KMnO4 in moles per liter.

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Answer:

d- 7.58 L

Explanation:

According to Charles's law, the temperature in Kelvin is proportional to the volume of a dry gas when the pressure is constant.

Mathematically, V1/T1 = V2/ T2

V1= initial volume= 6.6 L

T1= Initial temperature= 115 °C= (115 °C +273)=388K

V2= final volume

T2= final temperature= 173 °C= ( 173 °C+ 273)= 446K

Substitute the values,

V2=( V1 × T2)/ T1

= (6.6×446)/388

= 2943.6/388

= 7.6L

At t = 20 minutes, there is approximately 180.48lb of salt and 60gal of solution in the tank.

Let's denote A(t) as the amount of salt at time t.

The rate of change of salt in the tank is given by the rate at which brine enters the tank minus the rate at which the solution leaves the tank. In this case, the rate at which brine enters the tank is 4gal/min and contains 2lb of salt per gallon. So, the rate of salt entering the tank is (4gal/min) * (2lb/gal) = 8lb/min.

The rate at which the solution leaves the tank is 6gal/min. Since the tank initially contains 100gal of pure water, the amount of solution leaving the tank without salt is (6gal/min) * (100gal) = 600gal.

Therefore, the differential equation for the amount of salt A(t) is dA/dt = 8 - (6/100)A.

To solve this differential equation, we can use separation of variables and integrate. The solution for A(t) is A(t) = 400(1 - e^(-t/50)).

At t = 20 minutes, we can substitute t into the solution to find the amount of salt in the tank. A(20) = 400(1 - e^(-20/50)) ≈ 400(1 - 0.5488) ≈ 400(0.4512) ≈ 180.48lb.

The amount of solution in the tank at t = 20 minutes is 100gal + (4gal/min - 6gal/min)*20min = 100gal - 40gal = 60gal.

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There are 40 lb of salt in the tank at t = 20 minutes. Since the tank initially contains 100gal of pure water.

We can use the concept of differential equations. We know that the rate at which salt enters the tank is 2lb/gal * 4gal/min = 8lb/min. Similarly, the rate at which salt leaves the tank is 6gal/min.

The amount of salt and solution in the tank at t = 20 minutes, we substitute t = 20 into the equation:

A(20) = 2(20) = 40 lb.

Therefore, there are 40 lb of salt in the tank at t = 20 minutes. Since the tank initially contains 100gal of pure water.

Salt is a mineral composed primarily of sodium chloride (NaCl).

Salt is essential for life in general, and saltiness is one of the basic human tastes.

Salt is one of the oldest and most ubiquitous food seasonings, and is known to uniformly improve the taste perception of food, including otherwise unpalatable food.

Salting, brining, and pickling are also ancient and important methods of food preservation.

Salt is mostly sodium chloride (NaCl). Sea salt and mined salt may contain trace elements. Mined salt is often refined. Salt crystals are translucent and cubic in shape; they normally appear white but impurities may give them a blue or purple tinge.

When dissolved in water sodium chloride separates into Na+ and Cl− ions, and the solubility is 359 grams per litre.

From cold solutions, salt crystallises as the dihydrate NaCl·2H2O.

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Answer:

c I think I hope it helps

The high-density brine drains into the water beneath the ice and in the process, the sea ice freshens while the salinity of the underlying water decreases, becoming less dense (Option C).

Sea ice is usually less salty than the ocean water it freezes from. During the process of ice formation, salt in the ocean water is expelled from the ice as it grows; most of the salt is ejected into the ocean but some remain trapped inside pockets of brine within the ice. When the air temperature falls below the freezing point of seawater (usually around -1.8 °C), water molecules start to form ice crystals, which grow and aggregate into a solid sheet of ice.

During this process, the salt rejected by the growing ice also accumulates, causing the salinity of the remaining brine to increase. Some of the brine is encapsulated within ice crystals, but most are trapped in the spaces between neighboring crystals.

Thus, the correct option is C.

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Answer:

1. No reaction.

2. ZnCl₂ + H₂

3. CaCl₂ + H₂

Explanation:

1. Cu + HCl —> ___

From the reactivity series of metals, H is higher that Cu in the series and so, Cu can not displace H from solution.

Therefore, no reaction will occur.

2. Zn + HCl —> ___

Zn is higher than H in the activity series so, it will displace H from acid solution to produce hydrogen gas, H₂.

The balanced equation is given below:

Zn + 2HCl —> ZnCl₂ + H₂

3. Ca + HCl —> ___

Ca is higher than H in the activity series so, it will displace H from acid solution to produce hydrogen gas, H₂.

The balanced equation is given below:

Ca + 2HCl —> CaCl₂ + H₂

Answer:

Table salt

Explanation:

Is most soluble in water

The conductivity of metalloids can be compared to the conductivity of metals and nonmetals because metalloids conduct electricity better than nonmetals, but not as well as metals (Option C).

The expression metalloids is a term used to denote chemical elements that have features resembling metals such as an acceptable electrical conductivity, but they are not metals (e.g. boron, germanium, antimony, arsenic, polonium, etc).

Therefore, with this data, we can see that metalloids are similar to metals in electrical conductivity but they are not metals because they do not fit all properties of metals.

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Answer:

1.0M HCl is the concentration of the acid

Explanation:

Based on the reaction, 1 mole of NaOH reacts per mole of HCl. That means the moles added of NaOH in the neutralization = Moles of HCl in the solution. With the moles and the volume in Liters we can find the molar concentration of HCl

Moles NaOH = Moles HCl:

25.0mL = 0.025L * (2.0moles / L) = 0.050moles HCl

Molarity:

0.050moles HCl / 0.0500L =

Answer:

boron-11

Explanation:

When an isotope emits a positron and produces boron-11, it is the isotope beryllium-11 (Be-11).

Beryllium-11 (Be-11) is an unstable isotope of beryllium. It has a proton number of 4, which means it normally has four protons in its nucleus. However, in this case, it undergoes a process known as positron emission.

During positron emission, one of the protons in the nucleus of beryllium-11 transforms into a neutron. This conversion process releases a positron (a positively charged electron) and results in the formation of boron-11 (B-11), which has five protons and six neutrons in its nucleus.

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Answer:

16.3 g

Explanation:

got it right on ck

Answer:

K°(g)* + 419 Kj/mole => K⁺(g) + e⁻

Explanation:

1st ionization step for potassium is the ionization of the 4s¹ electron. This requires 419 Kj/mole energy (endothermic). The reaction equation is ...

K°(g)* + 419 Kj/mole => K⁺(g) + e⁻

*note: Ionization of group IA metals requires they be in gas phase. That is, as shown by the Born-Haber Cycle** for formation of ionic compounds ...

K°(s) + 89.24 Kj/mole => K°(g); then ...

K°(g) + 419 Kj/mole => K⁺(g).

**Recommend review of Born-Haber cycle for formation of ionic compounds.

The balanced net ionic equation for the neutralization reaction of carbonic acid with potassium hydroxide is

H2CO3(aq) + 2OH-(aq) → CO3^(2-)(aq) + 2H2O(l)

Neutralization reaction is a chemical reaction between an acid and a base that produces a salt and water. Titrated means to determine the concentration of a solution by measuring the volume of a known solution required to react with it.

Net ionic equation is a chemical equation in which soluble ionic compounds are written as dissociated ions. When carbonic acid is titrated with potassium hydroxide, the following neutralization reaction takes place:

H2CO3 (aq) + 2KOH (aq) → K2CO3 (aq) + 2H2O (l)

The balanced net ionic equation for the neutralization reaction is:

H+ (aq) + OH- (aq) → H2O (l)

Thus, the balanced net ionic equation required is:

H2CO3(aq) + 2OH-(aq) → CO3^(2-)(aq) + 2H2O(l)

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Pressure has little effect on the solubility of liquids and solids because they are almost incompressible. This statement is True. Solid solubility hardly gets affected by changes in pressure.

A substance's physical and chemical characteristics affect how soluble it is. A few other factors and circumstances can also influence it. A few of them are: temperature, pressure, type of binding, and forces between the particles.

Pressure has a significantly greater impact on gases than it does on solids and liquids. The likelihood of a gas's solubility also increases as its partial pressure rises. One instance of how CO2 is stored under high pressure is in a soda bottle.

In like, like dissolves.

Each molecule has a unique set of intermolecular forces and connections. The likelihood of solubility between two dissimilar compounds is less likely than that between like substances. For instance, ethanol is highly soluble in water, a polar solvent, whereas water is not.

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The work function of the metal is obtained as 5.1 eV

The cutoff frequency is the frequency below which photo electric effect can not occur as electrons are not removed from the metal surface.

Now;

fo = 1.22 x 10^15 Hz

Wo = hfo

Wo = 6.6 * 10^-34 * 1.22 x 10^15

Wo = 8.1 * 10^-19 J

If 1 eV = 1.60 x 10-19 J

x eV = 8.1 * 10^-19 J

x = 8.1 * 10^-19/ 1.60 x 10-19

x = 5.1 eV

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The only elements that make up organic compounds are in option A. Carbon, hydrogen, oxygen, and nitrogen.

Organic compounds are compounds that primarily consist of carbon and hydrogen atoms. However, organic compounds can also contain other elements such as oxygen and nitrogen, which are commonly found in biological molecules. Carbon forms the backbone of organic compounds, providing the structural framework, while hydrogen is frequently bonded to carbon. Oxygen and nitrogen are also essential elements in organic compounds, participating in various functional groups and forming bonds with carbon and hydrogen.

Therefore, option A (Carbon, hydrogen, oxygen, and nitrogen) is the correct choice as it includes the elements that are predominantly found in organic compounds.

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Small molecules make up water. There are three of them: two hydrogen atoms and one oxygen atom. Hydrogen bonding is a force that holds water molecules together. It is the cause of water's extraordinary abilities.

Our bodies require water for the following reasons:

1. It soothes joints:  In the spine's disks and in joints, cartilage contains about 80% water. Over time, dehydration can reduce the joints' ability to absorb damage, which can result in joint pain.

2.It produces mucous and saliva: Saliva helps in digestion and keeps the eyes, nose, and lips moist. Wear and tear are prevented in this way. Furthermore, drinking water maintains the mouth healthy. When substituted for sweetened beverages, it can also stop tooth decay.

3. It delivers oxygen throughout the body: Blood transports oxygen to various parts of the body and contains more than 90% water.

4. It protects delicate areas of the spinal cord and brain with padding: Brain anatomy and function can be impacted by dehydration. Additionally, it contributes to the synthesis of neurotransmitters and hormones. Long-term dehydration can cause issues with reasoning and thinking.

5. It controls the body's temperature: Perspiration is the result of the middle-layers of the skin's stored water being released when the body becomes hot. Evaporation causes the body to cool. in a sport. Some scientists claim that: Source of reality When the body doesn't have enough water, it can't handle heat stress as well, and it stores more heat. Lots of water consumption may help to reduce physical stress if heat stress occurs when exercising. Yet additional research is needed to fully understand these effects.

6. Water is necessary for the digestive system: The bowel need water to operate properly. Dehydration can lead to constipation, excessive stomach acid, and digestive problems. The likelihood of stomach ulcers and heartburn has increased as a result.

7. It keeps blood pressure stable: Lack of water can cause blood to become thicker. Enough water may reduce the likelihood of vasopressin release, which reduces the risk of high blood pressure, by keeping our cells and organs hydrated.

8. Water prevents kidney damage: The kidneys are in charge of body fluid. Water deficiency may result in kidney stones and other problems. Water is required by the bowel for proper operation. Dehydration can cause digestive problems such as constipation, excessive stomach acid, and more. As a result, it is now more probable to have heartburn and stomach ulcers.

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Answer:

Approximately \(7.25\).

Explanation:

If the concentration of \({\rm H^{+}}\) ions in a solution is \(x\; {\rm M}\), the \({\rm pH}\) of that solution would be \((-\log_{10}(x))\).

Note that the base of the logarithm in this calculation should \(10\). One way to be sure is to state the base explicitly. Using the change of base rule of logarithms:

\(\begin{aligned}-\log_{10}(x) = -\frac{\ln(x)}{\ln(10)}\end{aligned}\).

In this question, it is implied that the concentration of \({\rm H^{+}}\) in the given solution is \(5.6 \times 10^{-8}\; {\rm M}\), such that \(x = 5.6 \times 10^{-8}\). Using the equations above:

\(\begin{aligned}& \text{pH of this solution} \\ =\; & -\log_{10}(x) \\ =\; & -\frac{\ln(x)}{\ln(10)} \\ =\; & -\frac{\ln(5.6 \times 10^{-8})}{\ln(10)} \\ \approx\; & 7.25\end{aligned}\).

Answer: The concentration of hydrogen ions is \(10^{-11}M\) and the concentration of hydroxide ions is \(10^{-3}M\). Thus the concentration of hydroxide ions is more than the concentration of hydrogen ions.

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.  

\(pH=-\log [H^+]\)

\(pOH=-\log[OH^-]\)

Putting in the values:

\(11=-\log[H^+]\)

\([H^+]=10^{-11}M\)

\(pH+pOH=14\)

\(pOH=14-11=3\)

\(3=-log[OH^-]\)

\([OH^-]=10^{-3}M\)

Thus the concentration of hydroxide ions is more than the concentration of hydrogen ions.

If a titration net volume should be 20. 00 ml and a student accidentally goes one drop past the endpoint (~0. 05 ml),then the percent error is 0.25%.

Percent error is defined as the difference of experimental value and theoretical value and measures the accuracy of the result found. The greater the error, lesser is the accuracy and vice versa.

Vd = 1mL/20 drops

where,

Vd is volume of one drop

Vd = 0.05mL

Error is defined as the ratio of change in volume divided by real volume.

e(%) = {(Vr-Vt) /Vt}×100

where,

Vr = real volume

Vd = theoretical volume

e(%) = {((20+0.05) -20) /20} × 100

e(%) = 0.25%

Thus, we find that the percent error on adding one drop is 0.25%.

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Molecular mass/ empirical formula mass = n

Where n is a whole number.

For the above question, n = 2

The above formula is used to calculate the formula mass of a compound.

Where n, that is the answer, should be a whole number or very close to a whole number.

Molecular mass = 220.771 g/mol

Se molecular weight =78.96

Cl molecular weight = 35

The formula mass = 78.96+35.45 = 114.41

Thus, n = 220/114 = 2

Hence value of n=2  

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Answer:

The electrons' energy is limited to a certain value which relates to its distance from the protons in the nucleus.

Explanation:

In both the Bohr's model of the atom and the quantum mechanical model of the atom, the idea that the electron is found in specific energy levels that corresponds to the distance of the electron from the protons in the nucleus is firmly upheld.

While the Bohr's model refers to these energy values as shells, the quantum mechanical model interprets this value as the relative overall energy of each level. This energy value of each level increases as its distance from the nucleus increases.

Answer:

B. The reactants are compounds that react to form new compounds (the products).

Explanation:

yessirski what he said is what im doing. Thanks, guys! #BrainlyPremium

Answer:

Animal

Explanation: