3-4. When something interests you, how do you make a hypothesis?
5-6. Why is it important to take a good notes when you are conducting an experiment?
7-8. What is the last step in the scientific method? Explain.
9-10. Name one thing you want to investigate this year for a scientific project? Why? ​

Answer:

D

Explanation:

hi

good morning

I hope right answer

Answer:

Precise

Explanation:

hope it helps!!!!!!!!

Answer:Water pollution can come from a variety of sources. Pollution can enter water directly, through both legal and illegal discharges from factories, for example, or imperfect water treatment plants. Spills and leaks from oil pipelines or hydraulic fracturing (fracking) operations can degrade water supplies.

Explanation:

Answer:

the right answer is option A

Answer:

a.the central o atom oo

Explanation:

wala lang

Because there are 2 Cl on the left, we will put a coefficient 2in front of HCl on the right side to balance out the Cl. This would result in an unequal amount of H, with 6 on the right side and 7 in the left, so we have to put a coefficient of 2 in front of C6H5OH and C6H4OH on both sides to balance out the H. By doing this, we would obtain an equal amount of H on both sides. The Carbon is already balanced, and so is the Oxygen.

The balanced chemical reaction equation for the reaction between aromatic phenol and chlorine gas in the presence of FeCl3 as catalyst is as follows;

C6H6O + Cl2 -------> C6H5OCl + HCl

An aromatic compound has 4n + 2 number of pi electrons. This condition is satisfied by phenol. Hence, phenol has the stability associated with aromatic compounds.

The reaction of phenol with chlorine in the presence of a catalyst such as FeCl3 is an aromatic electrophillic substitution reaction.

This reaction yields a chlorinated phenol (one of the aromatic hydrogen atoms attached directly to a C atom is replaced with a chlorine  atom and chlorophenol is formed).

A balanced chemical reaction equation is one in which the number of atoms of each element at the reactant side and the product side are equal. This condition is satisfied for the reaction;

C6H6O + Cl2 -------> C6H5OCl + HCl

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Answer:

CH3

Explanation:

Answer:

cyclohexene

One molecule of cyclohexanol should produce one molecule of cyclohexene. One mole (mol) of cyclohexanol should produce one mole of cyclohexene.

Explanation:

The major products of the complete hydrolysis of disaccharides and polysaccharides are three monosaccharide units: glucose, fructose, and galactose.

Boyles law!! Pressure is inversely proportional to volume!

Answer:

the carbohydrates in cotton are mainly cellulose, but our body does not possess the proper enzymes to process cellulose, no we don't eat cotton on in our daily diet.

Answer:

Explanation:

Image result for describe five factors which affect propagation of sound.. please describe in details.​

There are several important factors which affect the propagation of sound: geometric spreading, atmospheric effects, and surface effects. These are discussed separately below. This refers to the spreading of sound energy as a result of the expansion of the wavefronts.

Answer:

the answer of this question is 0.0041M

Answer:

carbon monoxide

Explanation:

yes this is the answer

Carbon mono-oxide is the gas which dissolve in ammonia copper(ii) chloride but insoluble in water.

Carbon monoxide (CO) is just a toxic gas that is colorless and odorless. It is created when various fuels, such as coal, wood, charcoal, oil, kerosene, propane, as well as natural gas, are burned incompletely.

What is gas?

One of the four basic states of matter is gas. Individual atoms, elemental molecules created from one type of atom can make up a pure gas.

Therefore, carbon mono-oxide is the gas which dissolve in ammonia copper(ii) chloride but insoluble in water.

To know more about gas and carbon mono-oxide.

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Answer:

give me brainliest

Explanation:

The shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron. The shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron.

Answer:

The shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud

Explanation:

i am not sure but i hope it will help you

Answer:

Yeah, if you have the atomic number and neutron number

[tex]mass = protons + neutrons[/tex]

protons is the atomic number

Answer:

A titration is an analytical procedure used to determine the concentration of a sample by reacting it with

a standard solution. One type of titration uses a neutralization reaction, in which an acid and a base

react to produce a salt and water.

In a titration, the standard solution goes in a buret, which is a piece of glassware used to measure the

volume of solvent to approximately 0.1 mL of accuracy. The solution that you are titrating goes in an

Erlenmeyer flask, which should be large enough to accommodate both your sample and the standard

solution you are adding.

To solve such this we must know the concept of acid-base reaction. Therefore, NH[tex]_3[/tex] is the compound that will react to the greatest extent with boron trifluoride (BF[tex]_3[/tex]) in a Lewis acid-base reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

NH[tex]_3[/tex] is an example of a Lewis Base that will react extensively with BF[tex]_3[/tex] to form the compound NH[tex]_3[/tex] + BF[tex]_3[/tex] → [B (NH[tex]_3[/tex])F[tex]_3[/tex]].

Therefore, NH[tex]_3[/tex] is the compound that will react to the greatest extent with boron trifluoride (BF[tex]_3[/tex]) in a Lewis acid-base reaction.

Learn more about the chemical reactions, here:

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Answer:

Hydrochloric acid reacts with the materials to produce bubbling, or fizzing, a gas, and heat.

Explanation:

Answer:

x-2 = 0

x = 2

hope this was help full

Answer: What happens when a single molecule is replaced by a hydrogen by an oh group

Explanation:

Answer:

278 atm

Explanation:

We're gonna use this formula: [tex]\frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]

P₁ = 177 atm

T₁ = 298 (Convert Celsius to kelvins by adding 273)

P₂ = ?

T₂ = 468 (195 + 273)

We got

[tex]\frac{177}{298} =\frac{P_2}{468}[/tex]

We can cross-multiply or multiply both sides by 468

I'm gonna go with the latter

[tex](468)\frac{177}{298} =\frac{P_2}{468}(468)[/tex]

[tex]P_2 = \frac{(468)(177)}{298}[/tex]

[tex]P_2 = 277.973[/tex]

Answer:

[tex]\boxed {\boxed {\sf 278 \ atm}}[/tex]

Explanation:

We are asked to find the gas pressure when the temperature of a gas is changed. We will use Gay-Lussac's Law, which states the pressure of a gas is proportional to the temperature of the gas. The formula for this law is:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

Initially, the pressure is 177 atmospheres and the temperature is 25 degrees Celsius or 298 Kelvin.

[tex]\frac {177 \ atm}{298 \ K}=\frac{P_2}{T_2}[/tex]

Then, the gas cylinder is exposed to fire and the temperature is raised to 195 degrees Celsius or 468 Kelvin, but the pressure is unknown.

[tex]\frac {177 \ atm}{298 \ K }=\frac{P_2}{468 \ K}[/tex]

We are solving for the new pressure, so we must isolate the variable P₂. It is being divided by 468 Kelvin. The inverse operation of division is multiplication, so we multiply both sides of the equation by 468 Kelvin.

[tex]468 \ K *\frac {177 \ atm}{298 \ K}=\frac{P_2}{468 \ K}*468 \ K[/tex]

[tex]468 \ K *\frac {177 \ atm}{298 \ K}=P_2[/tex]

The units of Kelvin cancel.

[tex]468 \ K *\frac {177 \ atm}{298 \ K }=P_2[/tex]

[tex]468 * 0.593959731544 \ atm = P_2[/tex]

[tex]277.973154362 \ atm = P_2[/tex]

The pressure in the cylinder after exposure to fire is approximately 278 atmospheres.

Answer:

Gas

Explanation:

Do not put any sub- stance into the flame unless specifically instructed to do so. Never reach over an exposed flame. Light gas (or alcohol) burners only as instructed by the teacher.

Answer:

The elements boron, silicon, germanium, arsenic, antimony, and tellurium separate the metals from the nonmetals in the periodic table. These elements, called metalloids or sometimes semimetals, exhibit properties characteristic of both metals and nonmetals.

Elements: Oxygen

A. 0.2 mole of HCl is needed for the reaction

B. The molarity of NaOH solution is 0.04 M

C. The molarity of HCl is 0.043 M

Molarity is defined as the mole of solute per unit litre of the solution.

We'll begin by calculating the number of mole of NaOH in the solution.

Volume = 0.1 L

Molarity of NaOH = 2 M

Mole = Molarity x Volume

Mole of NaOH = 2 × 0.1

Finally, we shall determine mole of HCl.

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

1 mole of NaOH required 1 mole of HCl.

Therefore, 0.2 mole of NaOH will also require 0.2 mole of HCl.

Thus, 0.2 mole of HCl is needed for the reaction.

HCl + NaOH —> NaCl + H₂O

From the balanced equation,

Mole ratio of the acid, HCl (nA) = 1

Mole ratio of the base, NaOH (nB) = 1

From the question given above above,

Volume of acid, HCl (Va) = 0.025 L

Molarity of acid, HCl (Ma) = 0.05 M

Volume of base, NaOH (Vb) = 0.034 L

Mava / mbvb = na/nb

0.05 x 0.025 / Mb x 0.034 = 1

0.00125 / Mb x 0.034 = 1

Cross multiply

Mb x 0.034 = 0.00125

Divide both side by 0.034

Mb = 0.00125 / 0.034

Mb = 0.04 M

Therefore, the molarity of NaOH is 0.04 M

From the question given above above,

Volume of base, NaOH (Vb) = 0.054 L

Molarity of base, NaOH (Mb) = 0.1 M

Volume of acid, HCl (Va) = 0.125 L

Mole ratio of the acid, HCl (nA) = 1

Mole ratio of the base, NaOH (nB) = 1

Mava / mbvb = na/nb

Ma x 0.125 / 0.1 x 0.054 = 1

Ma x 0.125 / 0.0054 = 1

Cross multiply

Ma × 0.125 = 0.0054

Divide both side by 0.125

Ma = 0.0054/0.125

Therefore, the molarity of the HCl is 0.043 M

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Answer:

1. Based on the two video clips on titration from the links provided earlier on the watsApp Group and a study master, carry out the following tests , a define the forms(i) titrant (2) Strand or analyte (3) Indicator (4) end point (5) titration. b. write in point form (list), the steps inolved in titration (including the relevant apparatus used) - write a typed Laboratory report for this assignment where there is no data to put in, include the relevant headings but without data. (For those who can attempt to do some calculations based the presentations, you are encouraged The report should be handed in when you open back to college​

Explanation:

the answer is end point

Answer:

5.48 x 10´23 atoms

Explanation:

Use PV = nRT

V = 20 L

R= constant = 0,08205746 L atm / (K mol)

stp means stantdard temperature and pression

T = 273 K

P =  0.987 atm

n = PV/RT = (0.987 atm)   x           (20 L)     = 0.88 moles

                    (0,082 Latm/(K mol)x 273 K

0.88 moles x [tex]6.22 x 10^{23}[/tex] molecules = 5.48 x 10´23 atoms

Answer:

A variable is anything that can change or be changed. In other words, it is any factor that can be manipulated, controlled for, or measured in an experiment.

I need 0.1g of protein

HOW TO CALCULATE NUMBER OF MOLES?

no of moles (n) = Molarity (M) × Volume (V)

In this question, 100 ml of a 20 uM solution of a protein was given.

Since 1uM = 10^-6M

20uM = 20 × 10-⁶

= 2 × 10-⁵M

1L = 1000ml

100mL = 100/1000

= 0.1L

no of moles = 2 × 10-⁵M × 0.1L

no of moles = 2 × 10-⁶mol

HOW TO CALCULATE MASS:

Mass = moles × Molar mass

Molecular mass of protein = 50,000g/mol

Mass = 2 × 10-⁶mol × 50000g/mol

Mass = 0.1g

Therefore, 0.1gram of protein is needed

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Molarity of a solution is simply defined as the mole of solute per unit litre of water.

Mathematically, it is expressed as:

[tex]Molaity = \frac{Mole }{Volume }[/tex]

With the above information in mind, we can determine the amount of the protein needed as follow:

Data obtained from the question

Volume = 100 mL

Molarity = 20 μM = 20×10¯⁶ M

Molecular weight of protein = 50000 g/mol

Conversion of 100 mL to litre (L).

1000 mL = 1 L

Therefore,

[tex]100 mL = \frac{100 mL * 1 L}{100 mL }\\\\100 mL = 0.1 L[/tex]

Determination of the mole of the protein

Volume = 0.1 L

Molarity = 20×10¯⁶ M

Mole = Molarity × Volume

Mole of protein = 20×10¯⁶ × 0.1

Determination of the mass of the protein

Mole of protein = 2×10¯⁶ mole

Molecular weight of protein = 50000 g/mol

Mass = mole × molar mass

Mass of protein =  2×10¯⁶ × 50000

Therefore, the amount of the protein needed is 0.1 g

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