What number helps us identify the element?

Preform the mathematical operation and then write the answer to the correct number of significant figures.

a) 110 g

b) 9030 cm

c) 6.0 cm

d)9.6 mm

e) 419.8 mL

f) 766.8 m

a) 100 g + 10 g = 110g

b) 903 cm × 10 cm = 9030 cm

c) 0.6030 cm² / 0.1 cm = 6.0 cm

here lowest significant is = 0.1 , so ans will round off till first decimal.

d) 9.5 mm + 0.083 mm = 9.583 mm = 9.6 mm

e) 430.0 mL -10.2111 mL = 419.8 mL

f) 762.4 m + 3.2 m + 1.21 m = 766.8 m

here the lowest significant figure = 3.2 , so the ans will be round off to first decimal figure.

Thus, preform the mathematical operation and then write the answer to the correct number of significant figures.

a) 110 g

b) 9030 cm

c) 6.0 cm

d)9.6 mm

e) 419.8 mL

f) 766.8 m

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The release of O₂( oxygen) from the process of photosynthesis is what made them to be able to float.

This is referred to as the process in which green plants manufacture their food in the presence of sunlight which is trapped by chlorophyll.They are known as primary producers and they use compounds such as water and carbondioxide.

The reactants mentioned above undergo series of reactions which leads to the production of glucose and oxygen is given off as a result which is the element responsible for the floating of the aspirated spinach leaf disks in this scenario.

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Answer:

Problems of Using Ionic and Covalent Compounds in Medicine

Stomach pain.

Nausea.

Vomiting.

Heartburn.

Gas.

Constipation.

Diarrhea.

A total of 2269 balloons of 1.5 Liters volume and 1.25 atm pressure can be filled from the cylinder of volume 2.3 Liters and 1850 atm pressure.

The volume of the Helium gas is 2.3L and the pressure is 1850 atm at 25° Celsius.

The smaller balloons that has to be filled are of volume 1.5 L at the pressure 1.25atm at the same temperature of 25° C.

Because the temperature is conserved, so, according to Boyle's law,

When temperature is constant, the pressure and volume of the gas are inversely proportional to each other.

we can write,

P₁V₁ = P₂V₂

Let us say that a total n numbers of smaller balloons can be filled, so,

P₁V₁ = n(P₂V₂)

Where,

P₁ is pressure of bigger balloon,

V₁ is the volume of the bigger balloon,

P₂ is the pressure of the smaller balloon and,

V₂ is the volume of the smaller balloon.

Now, putting all the values,

2.30 x 1850 = n(1.5 x 1.25)

n = 2269

So, a total 2269 balloons can be filled from the bigger balloon to the smaller balloons.

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The concentration of the dilute solution is 0.3592 M.

Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.

If the concentrated nitric acid solution is 12.0 M, then there are 12.0 moles nitric acid per liter of solution.

For a 4.49 ml of a concentrated 12.0 M nitric acid solution, the number of moles is 0.05388.

M = moles of solute / volume of solution

moles = 12.0 M(4.49 ml)(1 L / 1000 ml)

moles = 0.05388 moles nitric acid

If the total volume is 150 ml, then the concentration of the diluted solution is

M = moles of solute / volume of solution

M = 0.05388 moles nitric acid / 150 mL (1 L / 1000 ml)

M = 0.3592

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Answer:

The attraction is a hydrogen bonding.

Explanation:

Based on the information on intermolecular forces, when a Hydrogen is specifically bonded with a Nitrogen, Oxygen or Fluorine, their bonding is called a hydrogen bond.

The best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment

Organ system is the group of tissue that work together for the overall function of organ and also organ system is the group of organ that work together to perform a specific function and the human organ consist of eleven organ system and that is respiratory, execratory, circulatory, digestive etc and the best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment because when your muscle and skeletal system are working to help your body increase heat when shivering

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The fusion of hydrogen nuclei into helium nuclei in the solar core is how the Sun obtains its energy. The proton-proton chain, a series of nuclear fusion processes, describes this hydrogen burning.

Protons, which are just single hydrogen atoms, are the starting point of this process inside the sun. Through a series of stages, these protons fuse together to form helium. This fusion process takes place in the sun's core, and the energy released as a result of transmutation maintains the sun's hot.

A deuterium (2H) nucleus is created from two protons in the first step of the hydrogen fusion process, along with an antielectron and a neutrino.

Four hydrogen protons and two electrons are used in the basic hydrogen fusion cycle, which results in the creation of a helium nucleus, two neutrinos, and six photons.

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zn + 2 AgCI-> ZnCI2+ 2Ag

2 FeCI3+ 3 H2s->___FeCI2+ 6 HCI+___s

2 Ag2O-> 4 Ag+ O2

4AI2O3-> 3 AI+ 2O2

2 K+ 2H2O-> 2 KOH+ H2

Caco3-> CaO+ CO2

2 MG+ O2-> 2MgO

CO+ 3 Fe2O3-> 2 Fe+ 3CO2

2 H2+ 3 Fe2O3-> Fe+ 3H2O

HCI+ 2 ZN-> H2+ ZnCI2

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The balanced reaction equation for this redox reaction looks like this:

H₂S(aq) + Cl₂(g) → S(s) + 2HCl(aq)

First, we write what we know about the reaction:

Hydrogen sulfide (H₂S) that is dissolved in the wastewater (so the physical state is (aq)) is reacting with gaseous chlorine (so Cl₂(g)) to form sulfur (which is solid at room temperature, and does not dissolve in water, so S(g)) and chloride ions (Cl⁻). To counter their negative charge, we add the hydrogen from H₂S to chlorides, which results in HCl, which is soluble in water, so the physical state is (aq):

H₂S(aq) + Cl₂(g) → S(s) + HCl(aq)

When we look at this equation we can see that it is not balanced, because we have 2 H atoms and 2 Cl atoms on the left, and only 1 of both on the right. The easiest way to rectify this is to add "2" in front of HCl, resulting in a balanced reaction equation:

H₂S(aq) + Cl₂(g) → S(s) + 2HCl(aq)

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1) The reaction is exothermic and heat is a product

2) The color would turn to pink.

Let us recall that an endothermic reaction is one in which the increase in the temperature of the system would drive the forward reaction. This implies that the equilibrium would shift to the right when the set up is heated. Since the color of the solution changes to blue when heated hence the reaction is exothermic.

If you removed heat by placing the solution in the ice bath, we can see that we have removed the heat thus we expect that the reverse reaction would take place and the color would change to pink.

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To solve this problem, we must take into account Avogadro's number. Avogadro's number tells us that in one mole of any substance there are 6.022x10^23 atoms. Applying this relationship we have that the moles of potassium (K) are:

Now, to go from moles to grams, we must multiply the moles by the molar mass of potassium. The molar mass of potassium is 39.1g/mol. So, the grams of potassium will be:

Answer: In 3.4x10^23 atoms of potassium there are 22.1 grams

The volume of this cube-shaped area can be calculated by multiplying its length, width, and height i.e. length x width x height.

Volume is defined as the area that any three-dimensional solid takes up. The shapes of these solids include cubes, cuboids, cones, cylinders, and spheres.

The cubic meter serves as its equivalent in the International System of Units. Given that it can be computed using lengths, it is not regarded as a fundamental unit of the SI. The liter is the most widely used measurement.

The cube's volume is equal to the edge's length raised by three.

Thus, the volume of this cube-shaped area can be calculated by multiplying its length, width, and height i.e. length x width x height.

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The following two statements are true about chemical kinetics.

1. Chemical  kinetics is the study of the rate of reactions.
2. A reaction rate can be defined as the decrease in the concentrations of reactants with time.

Chemical kinetics deals with the study of rate of chemical reactions. Rate of reaction is defined as  the measure of the change in concentration of the reactants or the change in concentration of the products per unit time.

The reaction rates decrease with time because reactant concentrations decrease as reactants are converted to products. The rate decreases as the reaction proceeds.

               A→B

A= reactant        rate of reaction =-[tex]\frac{d[A]}{dt}[/tex]

B=product          rate of reaction=+[tex]\frac{d[B]}{dt}[/tex]

This means that the concentration of 'A' decrease  with respect to time. It can also be noted by measuring the increase in the Concentration of B with the passage of time.

Negative sign indicates the conc. of reactants decreases with time

Positive sign indicates that conc. of product increases with the passage of time .Remember rate of reaction always positive.

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First, we have to remember the law of conservation of matter:

"The matter can not be created nor destroyed. It can only be transformed".

Then, the answer, in theory, has to be 11.0 g, that is the addition of 5.0 g and 6.0 g.

The mass of the iron oxide produced in the given chemical reaction is equal to 27.04 grams.

The limiting reagent in a chemical reaction can be described as that reactant that will decide the amount of the yield of the product. The reactant consumed first will confirm the completion of the reaction if the reactants are not taken in stoichiometry.

Given the chemical reaction of the formation of iron oxide:

4Fe   +    3O₂    →    2Fe₂O₃

Given the mass of the iron = 15.4 grams

The moles of the iron = 15.4/56 = 0.275 mol

The mass of the oxygen gas = 3.6 grams

The moles of the oxygen gas = 3.6 /32 = 0.1125 mol

From the chemical equation, 4 moles of the Fe react with oxygen = 3 mol

Then 0.275 mol of the Fe will react with oxygen = 3/4 × 0.275 = 0.206 mol

Therefore, oxygen is the limiting reagent here.

The 3 mols of oxygen produced iron oxide = 2 mol

0.1124 mol of oxygen will produce iron oxide = (2/3) × 0.1125 = 27.04 g

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''They carry energy''. is the right statement about waves.

A wave is defined as a disturbance in a medium that carries energy without any movement of particles. It may take elastic deformation, a variation of pressure, electric intensity, magnetic intensity, electric potential, and temperature. There are three types of waves i.e. matter waves, mechanical waves, and electromagnetic waves.

All types of waves have the same basic properties of reflection, refraction, diffraction, and interference. All waves have a wavelength, frequency, speed, and amplitude. A wave can be explained by its length, amplitude, and frequency. All waves transfer energy from one place to another, they can also be reflected as well as refracted.

So we can conclude that option A is the right answer about the waves.

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It is important to use a volumetric pipette and volumetric flasks  because they are marked with one trace, they are calibrated and there are very less chance of error in them.

The percentage error of volumetric flask is very low at 0.3%. Volumetric pipette and volumetric flasks are specially designed to give accurate measurements of liquids and make them suitable for preparing standard solutions.

The volumetric pipette has a long and narrow neck which makes it easier to measure.      

Graduated cylinders are more accurate then beakers. However they are not used to carry volumetric evaluations for this purpose volumetric tools like flasks and pipettes are used because they are more accurate and exact.

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Answer C I think

Explanation:

The molarity of a solution is calculated from the number of moles of solute and the volume of solution in liters. The molarity of potassium permanganate solution 2.145 g of  iron(ii) ammonium sulfate hexahydrate is 0.121 M.

Molarity is used to represent the concentration of a solution. It is the ratio of number of moles of solute to the volume of solution in litres. Molarity depends on the temperature also.

The number of moles of a solute can be calculated from the molar mass and taken weight of the solute.

The molar mass of  iron(ii) ammonium sulfate hexahydrate = 392.1 g/mol

Taken weight of solute = 2.145 g.

Therefore, the number of moles of  iron(ii) ammonium sulfate hexahydrate = 2.145 / 392.1

                     = 0.0054 moles.

Now, the molarity of the solution is calculated as follows:

Molarity of  solution  =( no.of moles of  iron(ii) ammonium sulfate hexahydrate ) / volume

                                    = 0.0054 /0.045 L

                                    = 0.121 M

Hence, The molarity of potassium permanganate solution 2.145 g of  iron(ii) ammonium sulfate hexahydrate is 0.121 M.

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Using the percentage by volume of the solutions given, we can calculate that we require 216 mL of 100% alcohol and 384 mL of 50% alcohol.

The percentages given refer to the percentage by volume (%V). We need to make 600 mL of 68% alcohol solution, by mixing a certain volume of 50% solution (A) and a certain volume of 100% alcohol (B). So, we know that:

A + B = 600 mL

We also know that the total volume of alcohol in the end solution needs to be:

0.68 * 600 mL = 408 mL

So, by extension:

0.50 * A + B = 408 mL

Based on the first equation, we can say that:

A = 600 mL - B

If we use that A in the second equation we get:

0.50 * (600 mL - B) + B = 408 mL

300 mL - 0.50 B + B = 408 mL

If we rearrange this equation we get:

B - 0.50 * B = 408 mL - 300 mL

0.50 * B = 108 mL

B = 108 mL / 0.50

B = 216 mL

A = 600 mL - 216 mL = 384 mL

So, we need 216 mL of 100% alcohol and 384 mL of 50% alcohol solution to get 600 mL of 68% alcohol solution.

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Answer:216 ml

Explanation: I got it right

Answer:

the periodic table is the table of contents of the elements

The heat of reaction is  1.8 KJ. A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and measuring the heat of chemical processes or other physical changes.

Volume of water = 67.9 mL

Since the density of water is 1.00 g/mL

Density = mass/volume

Mass of water = Density × volume

Mass of water =  1 g/mL × 67.9 mL

Mass of water = 67.9g or 0.0679 Kg

Temperature change =  6.5 oC

Specific heat capacity of water= 4.184 J/Kg

From;

H = mcθ

m = mass of water

c = heat capacity of water

θ = temperature rise

Substituting values;

H = 0.0679 Kg × 4.184 J/Kg × 6.5 oC

H = 1.8 KJ

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The minimum mass of  sulphur , in grams, needed to prepare 17.5 g of [tex]H_{2} So_{4}[/tex]is 53.5 gram

The molecular mass of eight molecules of sulphuric acid is 784 grams.

So 256 grams of sulphur makes 784 grams of sulphuric acid

That means 17.5 grams of sulphur can give

[tex]\frac{784}{256}[/tex] ×17.5 grams of sulphuric acid

And by solving this we get 53.5 grams.

That's how we determined the required grams of sulphur in grams.

The mass of a given molecule is its molecular mass (m), which is expressed in daltons. Because they contain various isotopes of an element, different molecules of the same compound can have distinct molecular masses. According to IUPAC, the related quantity relative molecular mass is a unitless comparison between the mass of a molecule and the unified atomic mass unit (also called the dalton).

The molar mass, which is expressed in g/mol, is defined as the mass of a given substance divided by the amount of a substance. That makes the molar mass an average of many particles or molecules, and the molecular mass the mass of one specific particle or molecule.

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The mass number of this atom having 53 protons, 78 neutrons, and 54 electrons will be 131.

In the field of science, we can describe a mass number of an atom as simply a measure of the protons and neutrons that are to be found in the nucleus of an atom. In chemistry, the mass number is denoted by the letter 'A'.

In the above-mentioned case, the number of protons of the atom is 53 whereas the number of neutrons is 78.

In order to calculate the mass number, we will add the number of protons and neutrons. As the result of the addition of 53+78 is 131 hence, the mass number will be 131.

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Answer:

Explanation: when electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.

According to Laplace's law lungs should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure.

According to this law of Laplace, if the radius of the blood vessel is larger than the wall tension required will be larger in order to withstand or overcome the pressure which is exerted by internal fluids or gases.

The alveoli are to remain inflated as the gaseous pressure which is developed inside the alveoli is greater than the pressure of atmosphere.

When the blood vessel thickens or its thickness increases, it will result in the reduction of the tension developed by the gas at a given constant pressure.

It was published in a research paper that according to law of Laplace, lung should remain inflated because air pressure in alveoli is more than the pressure of the atmosphere.

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Hence 3.23×10⁶kJ = 771970 kilo calorie.

Kilo joule is a unit of energy that is equal to 1000 joules.

1 kilojoule is equal to 1000 joules:

∵ 1kJ = 0.239kcal

∴ 3.23×10⁶kJ = 3.23×10⁶ × 0.239

                      = 771970 kcal

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