a chemist has 70 ml of 50% methane solution. how much of an 80% siolution must she add yo get a 60% solution?

Mass percentage is a term that represents the concentration, basically mass by mass percentage. It tells about the percentage of a component in a whole component. Therefore, in the below given ways we can find the percent composition.

Mass percentage represents the the percentage of each element that is making a particular compound. Mass percentage does not have any unit as numerator and denominator contains the same unit.

Mathematically,

Percentage of mass = (component’s mass ÷ total mass) x 100%

Therefore, in the above given ways we can find the percent composition.

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Before starting the titration, add a little quantity of Fe3+ to that same analyte's solution. any test curve that coincides with the concentration change.

The amount of solute contained in a specific amount of solution is the substance's concentration. The number of molecules or solute throughout 1 L of solution, or molarity, is used to express concentrations. Thus, [Kr]4d10 [K r] 4 d 10 would represent the condensed subsurface electronic structure of Depth comprehension+ C d 2 +. We can see from the diagram of something like the neutral cadmium molecule above that even after the removal of the 5s electrons, all of the remaining orbitals are still occupied with 2 electrons.

A It is a measurement of the amount of one substance is diluted with another. This can be used to describe any kind of compound, but it's most usually used to describe solutions, where it relates to how much solute has been dissolved in what seems like a solvent.

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0.14-0.036) x 6 = 0.624 0.624/.0592 = 10.54054054 At 25 degrees Celsius, each reaction's equilibrium constant is 1010.54054.

Degree (Celsius) (Celsius) Temperature measurements are frequently made using the degree Celsius. Celsius degrees are represented by the sign °C. The freezing and boiling points of water are used to form the Celsius scale, with 0°C and 100°C respectively.

It bears the name Celsius in honor of the Swedish scientist Hans Celsius (1701–1744), who initially proposed the temperate scale in 1742. The estate's Latin name, celsus, which means "mound," became the surname.

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0.14-0.036) x 6 = 0.624 0.624/.0592 = 10.54054054 At 25 degrees Celsius, each reaction's equilibrium constant is 1010.54054.

It bears the name Celsius in honor of the Swedish scientist Hans Celsius (1701–1744), who initially proposed the temperate scale in 1742. The estate's Latin name, celsus, which means "mound," became the surname.

A) (0.14-0.036) x 6 = 0.624

0.624/.0592 = 10.54054054

10^10.54054054 = 3.47 x 10^10 or 3.0 x 10^10 .

B) (.40-.34) x 4 = .24

.24/.0592 = 4.054054054

10^4.054054054 = 1.13 x 10^4 or 1.0 x 10^4 .

C) (1.09-.54) x 2 = .55

.55/.0592 = 18.58108108

10^18.58108108 = 3.81 x 10^18 or 4.0 x 10^18 .

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Answer:

Number Valency

Valency of Hydrogen 1 1

Valency of Helium 2 0

Valency of Lithium 3 1

Valency of Beryllium 4 2

Valency of Boron 5 3

Valency of Carbon 6 4

Valency of Nitrogen 7 3

Valency of Oxygen 8 2

Valency of Fluorine 9 1

Valency of Neon 10 0

Valency of Sodium (Na) 11 1

Valency of Magnesium (Mg) 12 2

Valency of Aluminium 13 3

Valency of Silicon 14 4

Valency of Phosphorus 15 3

Valency of Sulphur 16 2

Valency of Chlorine 17 1

Valency of Argon 18 0

Valency of Potassium (K) 19 1

Valency of Calcium 20 2

Valency of Scandium 21 3

Valency of Titanium 22 4

Valency of Vanadium 23 5,4

Valency of Chromium 24 2

Valency of Manganese 25 7, 4, 2

Valency of Iron (Fe) 26 2, 3

Valency of Cobalt 27 3, 2

Valency of Nickel 28 2

Valency of Copper (Cu) 29 2, 1

Valency of Zinc 30 2

When a 15.0-g sample of nitrogen is burned in excess oxygen. Which result is a single gas with a mass of 49.3 grams.  the empirical formula of the gas is NO2.

The chemical element with the atomic number 7 and the letter N is known as nitrogen. The lightest element in group 15 of the periodic table, often termed as the pnictogens, nitrogen is a nonmetal. It is a typical element in the cosmos, believed to be eighth in the Milky Way and the Solar System in terms of overall abundance.

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The two possible boat conformations of cis-1,3-dimethyl cyclohexane are the A) chair-boat and D)the twist-boat conformations.

The chair-boat conformation of cis-1,3-dimethyl cyclohexane has two methyl groups in the equatorial positions and two hydrogens in the axial positions. This conformation occurs when the molecule is twisted about 120° from the chair conformation.

The twist-boat conformation is similar to the chair-boat conformation, except the twist is greater than 120°. In the twist-boat conformation, the two methyl groups are in the axial positions while the two hydrogens are in the equatorial positions.

Both of these conformations are stabilized by the intramolecular hydrogen bonding between the hydrogen and the methyl group. This hydrogen bonding helps to reduce the overall strain within the molecule, allowing the molecule to exist in either of these stable conformations.

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When the reaction moves to the right to reach the chemical equilibrium, which is represented by the equation 2 SO2(g) + O2(g) 2 SO3(g) Kc=15, O2 = 0.80 M will be present.

is a condition in which the forward reaction rate is equal to the backward reaction rate. "A state where the concentration of reactant and product remains constant" is another definition of OR. For instance, H2(g)+I2(g)HI (g).

When anything is said to be in equilibrium, it refers to a balanced state. It describes a state in chemistry when the concentrations of the reactants and products are stable. Equilibria, the plural form of the word, is used to describe the study of concentrations in chemical reactions.

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The mass of the carbon dioxide gas is 26.4 g.

We know that the mass of the carbon dioxide can be gotten from the number of moles of the compound that we have in the compound and we can be able to get it from the ideal gas equation.

Temperature = 437°C + 273

Volume = 35L

Pressure =  1.00atm

Number of moles = ?

Given that;

PV = nRT

n = PV/RT

n =  1.00atm *  35L/0.082 atm LK-1mol-1 * 710

n = 35/58.22

n = 0.60 moles

Mass = Number of moles * Molar mass

= 0.60 moles * 44 g/mol

=26.4 g

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Since 32p has first-order kinetics and a half-life of 14.3 days, it will take 62 days for 95.0% of a sample to degrade. The half-life of a chemical reaction is the time interval during which the concentration.

Of a particular reactant reaches 50% of its initial concentration (i.e. the time taken for the reactant concentration to reach half of chemical reaction and its initial value). The sign "t1/2" is used to denote it and is frequently expressed in seconds. Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei) and position in the periodic table. 0.693/14.3 = 2.303/t *(log(100/5))

t = 61.82 days

t = 62days

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(E) 0.056 g weight of carbon in the sample is the answer that is correct.

Silicon is really a metalloid, a material that falls somewhere between the two categories of metals and non-metals. There is no clear definition of what falls under the category of metalloid, although in general, metalloids exhibit characteristics from both metallic and non-metals.

Given mass percent of silicon = 99.44 %

So, mass percent of carbon = (100-99.44) %

= 0.56 %

Hence, mass of carbon = 0.56 % of 10 g

= (0.56/100)×10 g

= 0.056 g

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The Complete Question is :

a 10.0 gram sample of impure silicon is 99.44% silicon by mass and the rest is carbon. The mass of carbon present in the sample is: Select one: OA. 9.944 grams OB. 99.44 grams OC. 0.56 grams O D. 5.6 x 10³ grams O E 0.056 grams

If a water heater can supply 40 KBTU/h then it will take 35.64 second to heat the water. This is calculated using the specific heat of water and the power concept.

The electrical energy is used totally depends on the total power used by all the electrical devices and the total time they are used. One kilowatt hour is equal to 1000 watts of power used for one hour of time.

time taken= energy required/ power delivered

System is used to define the measurement of a physical quantity. It is termed as the unit. Different types of unit measurement systems used are  the SI unit system, MKS unit system, Imperial unit system, British unit system, etc.

1 BTU = 1055.6 J

Specific heat of water Cw. = 4186 J/Kg.

Time taken = energy required / power

= 100 . Cw. / 1055.6 * 40*

= 100 * 4186 / 1055.6 * 40 .

= 9.9 * hours

= 35.64 sec

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The toxin that costs $30 per gallon is the most potent. We can draw the conclusion that the dandelion poison that costs $30 per gallon is the most potent.

Toxin from botulinum. Although scientists have different opinions on the relative toxicity of various compounds, most appear to concur that the anaerobic bacteria-produced botulinum toxin is the most toxic substance ever discovered. At most 1 nanogram per kilogram of its LD50 can kill a human.

In terms of poisoning, chemicals can be broken down into three major categories: biological poisons, or substances derived from plants and animals, pharmaceuticals, and health care goods. The following discussion covers these three categories as well as a fourth one called radiation.

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The final temperature of gas is approximately 436 K . if three moles of an ideal monatomic gas are at a temperature.

Monoatomic (monatomic): A molecule composed of just one atom, and lacking any covalent bonds. The noble gases (He, Ne, Ar, Kr, Xe, and Rn) are all monoatomic, whereas most other gases are at least diatomic.

Complete answer: Monatomic gas is the gas that has molecules containing a single atom only while diatomic gas has the molecule containing two atoms. Similarly, triatomic gas contains molecules with three atoms. The hydrogen gas exists as a diatomic molecule, as it contains two atoms of hydrogen.

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The temperature will be 62.5K  when the volume and pressure of the ga 100cm³ and 0. 5 atmosphere.

The ratio of the product of the original pressure and volume to the original temperature will equal the ratio of the product of the new pressure and volume to the new temperature, or, according to a commonly used version of the combined gas law.

According to Boyle's Law, gas volume grows as pressure lowers. According to Charles' Law, a gas expands in volume as its temperature rises. Additionally, Avogadro's Law states that as the number of gases increases, so does the volume of the gas.

From the combined gas law equation:

p1V1/T1 = p2V2/T2

where p1 - initial pressure, V1 - initial volume, T1 - initial temperature, p2 - final pressure, V2 - final volume, T2 - final temperature.

T2 = p2V2T1 / p1V1

As a result:

T2 = (0.5 atm × 100 cm3 × 500 K) / (1 atm × 400 cm3) = 62.5 K

T2 = 62.5 K

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The Vmax of the reaction is much lower with non-competitive inhibitor than reaction without inhibitor or with competitive inhibitor at high substrate concentrations because of noncompetitive inhibitor can only bind to an enzyme with or without a substrate at several places at a particular point in time

The substrate still binds to the enzyme in the presence of noncompetitive inhibitors. In fact, the binding of the substrate and inhibitor to the enzyme is completely unaffected by one another. The enzyme, however, is unable to catalyze the reaction to produce a product when the inhibitor is attached. Noncompetitive inhibition works by lowering the quantity of active enzyme molecules available to carry out a process.

In non-competitive inhibition, a different site on the enzyme is the spot where the inhibitor molecules interact with the substrate molecules rather than the active sites on the enzyme surface. As a result, there are less enzyme molecules available to catalyze the reaction. Thus, V m an x is decreased. Because of this, extra substrate cannot entirely overcome the non-competitive inhibitors. As a result, the reaction's V max decreases.

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Different samples of brass may melt at different temperatures due to variations in their composition. Impurities or other trace elements present in the brass can also affect the melting point.

The metal which is easiest to melt and has a low melting point is mercury. Mercury has the lowest melting point reaching in at -39 C, while on the other hand aluminium alloys melt at 463-671 C.

Brass is still mainly used in applications where there is need of corrosion resistance and low friction. It is used in locks, zippers, plumbing, valves, and electrical plugs and sockets. It is used vastly in making of some musical instruments also.

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LiI consists of ionic bond, CH3OH contains hydrogen bond, CH3CH3 contains London dispersions forces, CH2F2 has both dipole-dipole and London dispersion forces and  Lil + H20 consists of ion-dipole forces.

Ionic bonds are seen in molecules made primarily of metallic materials. When an ionic molecule is dissolved in a polar solvent, such as the solution, ion-dipole forces are at play. It is noticed between polar molecules and charged ions. The strongest intermolecular link between atoms is the hydrogen bond, which can form between O, N, or F. Polar molecules have dipole-dipole forces but lack O-H, N-H, or F-H bonds. All molecules experience London dispersion, which is only seen in nonpolar molecules.

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The Lewis symbol for Be2+ is Be2+.

Beryllium is a neutral element that means the no. of electron sand no. of protons they are same. It has two valence electrons. Be lost two negative charges. They will lose two electrons. Be having most stable electronic configuration.

Beryllium is a steel gray metal which is quite brittle at a room temperature, and its chemical properties somewhat resemble with aluminum. They do not occur in a free nature. Be are used in many industries like; Ceramic manufacturing, automotive as well as areospace. Be is a group 1 carcinogen. It is a divalent element which occurs naturally only in combination with the other elements to form a mineral.

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1s can only accommodate two electrons. For N, the next two electrons enter the 2s orbital. The 2p orbital will house the final three electrons. A 1s22s22p3 electron configuration will therefore be present in the N.

The shell number (n) is the first symbol used to represent an electron configuration, followed by the kind of orbital and the superscript number of electrons in the orbital. Consider this: The periodic table shows that oxygen has eight electrons.

In other words, we abide by the Aufbau Principle, Electron - electron Concept, and Hund's Rule.

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E°cell for the balanced redox reaction is -0.531 V.A redox reaction can be defined as a chemical reaction in which electrons are transferred between two reactants participating in it.

Calculating E° cells given K either K provided Eo cell can both be done using this equation. The following formula can be utilized if the RT is constant and the temperature is 298 K: Find the empirical formula (K) for the reaction using F o (0.025693V/n) and K is -0.34V.

PbO2 (s) + 4 H+ (aq) + Sn (s) --> Pb2+ (aq) + 2 H2O (l) + Sn2+ (aq) AI Recommended

Using E° cell table, calculate the E° readings using the conventional reduction potentials. Identify E°cell as E°cathode - E°anode in step 4. Step 5: We can use G = -nFE°cell after calculating E° cell and determining the amount of moles of electrons.

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The amount of heat is required to convert 10.1 g of an unknown liquid that has a molar mass of 83.21 g/mol to a gas is found to be 3680 J.

1. The amount of energy needed to increase a liquid's temperature from 19.2° to 57.3°. q = mCT q = heat =? m = mass = 10.1 g C = specific heat of liquid = 1.58 J/go

T = temperature change = 57.3 - 19.2 = 38.1 o q = (10.1 g) (1.58 J/go) (38.1 o) = 608

2. The temperature needed to turn a liquid into a gas at 57.3 degrees (phase change)

q = m

Hvap = enthalpy of vaporisation = 22.5 kJ/mol x 1 mol / 83.21 g = 0.2704 kJ/g = 270.4 J/g q = (10.1 g)(270.4 J/g) = 2731 J. Hvap = heat =? m = mass = 10.1 g

3. The amount of heat needed to increase the gas' temperature from 57.3° to 93.5° q = mCT q = heat =? the gas's specific heat is 0.932 J/go and the mass is 10.1 g. T = temperature change = 93.5o - 57.3o = 36.2o q = (10.1 g)(0.932 J/go)(36.2o) = 341 J

4. To determine the overall amount of heat required, add the heats from each step.

608 J + 2731 J + 341 J = 3680 J

One gramme of a substance's temperature can be raised by one degree Celsius by applying a certain amount of heat, or specific heat. Calories or joules per gramme per degree Celsius are frequently used as the units of specific heat. For instance, water has a specific heat of 1 calorie (or 4.186 joules) per gramme per degree Celsius.

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What amount of heat (in kJ) is required to convert 10.1 g of an unknown liquid (MM = 83.21 g/mol) at 19.2 °C to a gas at 93.5 °C? (specific heat capacity of liquid = 1.58 J/g･°C; specific heat capacity of gas = 0.932 J/g･°C; ∆Hvap = 22.5 kJ/mol; normal boiling point, Tb = 57.3°C)

Olympic size: At a rate of 4.60 liters per second, it would take 543,478.2608 seconds (or about 6.5 days) to remove 2.50 m^3 of water.

The Olympic Games are a major international multi-sport event featuring both summer and winter sports, held every four years. The modern Olympic Games were first held in Athens, Greece in 1896. The International Olympic Committee (IOC) organizes the Games and oversees the host cities. As the premier global sporting event, the Olympics feature more than 200 nations participating in a wide variety of sports

The volume of an Olympic size swimming pool is 50.0 m x 25.0 m x 2.00 m = 2500 m^3. To lower the water level by 1.50 cm, we need to remove a volume of 2.50 m^3 (1.50 cm/100 cm x 2500 m^3).
At a rate of 4.60 liters per second, it would take 543,478.2608 seconds (or about 6.5 days) to remove 2.50 m^3 of water.

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The atomic number of an element increases as a result of beta decay, where one of the neutrons in the nucleus abruptly transforms into a proton.

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If the pH of a solution is increased from pH 5 to pH 7, it means that the solution has become more alkaline. The pH scale ranges from 0 to 14, with 7 being neutral, less than 7 being acidic, and greater than 7 being basic or alkaline.

A pH increase from 5 to 7 means that the concentration of hydroxide ions in the solution has increased, leading to a higher level of basicity.

A change in pH can have significant impacts on the chemical and biological systems that the solution interacts with. For example, a change in pH can alter the solubility of certain substances, alter the activity of enzymes, or affect the growth and behavior of microorganisms. It is important to carefully control the pH of solutions in various applications, such as in food and beverage processing, pharmaceutical manufacturing, and environmental management.

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Answer:

A - not possible, B - possible, C- possible

Explanation:

You need to consider the reactivity series table. Check the attachment below.

A. If you see in the table, nickel is way below magnesium, meaning less reactive, and hence will not be able to snatch SO4 away from magnesium because it is not reactive enough so A is wrong.

B. Magnesium is more reactive than aluminium as mag appears right above alum, so yes possible.

C. Pb is lead which is more reactive than hydrogen so C is also possible.

Fe2S3 is The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur.

Fe = 0.961 mol and S = 1.44 mol, Now divide them to get lowest empirical formula. When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula.

Most ionic compounds are described with empirical formulas. A molecular formula describes the actual numbers of atoms of each element in a molecule. A compound that contains ions and is held together by ionic bonds is called an ionic compound. The periodic table can help us recognize many of the compounds that are ionic:

When a metal is combined with one or more nonmetals, the compound is usually ionic. This guideline works well for predicting ionic compound formation for most of the compounds typically encountered in an introductory chemistry course. However, it is not always true (for example, aluminum chloride, AlCl3, is not ionic).

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The stated assertion implies that X has the empirical formula C₃H₅O₂ since ethane-1, 2-diol has eight drinking functional groups.

When five or more atoms come together and establish bonds with one another, a molecule is created. When two atoms link together, they share a single electron. A molecule is created as a result of a covalent connection.

Because it has molecular bonds, water is a molecule. Water is a compound as well since it contains several different types of elements (oxygen and hydrogen). You might claim that water is really a type of molecule if you want.

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The beryllium ion has a charge of +2 and the fluorine ion has a charge of -1.

Fluorine is a chemical element on the periodic table with an atomic number of nine and a symbol of F. It is the most reactive of all elements, and is the only element that forms compounds with all other elements. It is a pale yellow gas with a pungent odor. It readily forms compounds with most metals and nonmetals, and is found in many minerals. Fluorine is used in industries such as glass, ceramics, and aluminum production. It is also used to produce uranium fuel for nuclear power plants. Fluorine is widely used in toothpaste, mouthwash, and other dental products to prevent tooth decay.

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The white crystalline solid which exhibits a melting point at -320°C and will not conduct electricity is NaOH

Manufacturers can use sodium hydroxide to make soap, rayon, paper, explosive products, dyes, and petroleum products. Other jobs where sodium hydroxide can be used include processing cotton cloth, cleaning and processing metals, oxide plating, electroplating, and electrowinning. Many metal hydroxides such as LiOH, NaOH, KOH, and Ca(OH)2 are bases. Non-metallic hydroxides like hypochlorous acid (HOCl) are acids.

Properties of sodium hydroxide

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