a chemist has three different acid solutions. the first acid solution contains 25 % acid, the second contains 45 % and the third contains 85 % . he wants to use all three solutions to obtain a mixture of 260 liters containing 35 % acid, using 3 times as much of the 85 % solution as the 45 % solution. how many liters of each solution should be used?

Answer: it would cause a serious shock

Explanation:

The process of a liquid becoming a gas is called boiling (or vapourization) and the process of a solid becoming a liquid is called melting.

Vaporization is the process of converting a liquid into a gas. It is also called evaporation. Since we know that the particles of a gas are moving faster than those of a liquid, an input of energy must be required for a liquid to become a gas.

Melting is a physical process that results in the phase transition of a substance from a solid to a liquid. During melting, the energy goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. Hence melting is an isothermal process because a substance stays at the same temperature.

Example 1: Industrially, salt is recovered from seawater by the process of vaporization. Wet clothes are dried up due to the process of vaporization. The process is used in many industrial processes for separating the components of a mixture.

Example 2: Ice to water - Ice melts back into the water when it is left out at temperatures above the freezing point of 32 degrees. Rocks to lava - Rocks in volcanoes can be heated until they are molten lava. Metal to molten liquid - Metals such as steel and bronze can be molten down.

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Answer:

Forests are a renewable resource

Answer: B. Forests

Explanation:

This is because, as part of its biological cycle, carbon is taken up by trees and becomes forest biomass that eventually dies, decays, and releases carbon that is in turn taken back up by renewed forest growth.

Explanation

To find the molar mass of sulfur dihydride, you will need to find the sum of all the atomic masses making up sulfur dihydride.

sulfur dihydride is H2S.

Atomic mass of H = 1,00784 u

Atomic mass of S = 32,065 u

Molar mass = (1.00784 x 2) + 32,065 = 34.081 g/mol

Answer

34.081 g/mol

It is needed 1498.25 g of SiO2.

- From the chemical equation, we know that to produce 40.10 g of SiC, it is needed 60.08 g of SiO2 and 36.033 g of C (because in the reaction there are 3 moles of C).

- Calculating we obtain that:

So, it is needed 1498.25 g of SiO2. This can be expressed as 1.50x10^3 g.

Answer

100 grams

Explanation

Given that:

The density of water = 1 gram/cm³

The volume of the water = 100 cm³

What to find:

The mass of the 100 cm³ of water.

Step-by-step solution:

The mass of the water can be calculated using the formula:

Therefore, this means that the mass of 100 cm3 of water should be 100 grams.

The oxidation number of hydrogen in H2 reactant will be 0.

The number assigned to each element in a chemical combination would be the simplest definition of the oxidation number. The amount of electrons that atoms in a molecule could share, lose or gain during forming chemical connections with other atoms of such a particular character would be known as the oxidation number.

Hydrogen can be considered as free elements and it is known that free elements have 0 oxidation number .Here, H2 element is also as a free element. So, it has 0 oxidation number.

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Kinetic energy liberated is 10.2 eV from the equation of photoelectric effect

What is photoelectric effect?

Photoelectric effect is a phenomenon in which electrons are ejected from the surface of a metal when light is incident on it.

What is the kinetic energy?

According to Einstein's photoelectric equation, we know that kinetic energy is the difference between the energy of incident photon and the work function of the metal.

KE = E - Wo

KE = kinetic energy

E = energy of the photon

Wo = work function

Now we know that

E = hf

h = Plank's constant (6.6 × 10-³⁴ )

f = frequency

E = 6.6 × 10-³⁴ × 3.62 × 10¹⁵

= 2.39 × 10-¹⁸J or 14.9 eV

1 eV = 1.6 × 10-¹⁹ J

Substituting

KE = 14.9eV - 4.7eV

KE = 10.2eV

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Significant figures are the number of digits in a number. To count the significant figures we must take into account that the zeros before the digit should not be counted, but the intermediate zeros or after the digit should be counted.

Now, when we do the two-digit division, the significant figures of the quotient will be equal to those of the digit with the fewest number of significant figures. Let's see what are the figures of the terms of the division and the final result:

We see that the quotient of the division is 0.746899..., but we have to write the answer only with 3 significant figures. If the number after the last figure to which we want to approximate is greater than 5, we must add 1 to the last figure, so the result will be: 0.747.

Answer: 0.747

The percent mass composition of carbon of the unknown compound is 42.8%.

The mass percentage of carbon in the given unknown compound is calculated as follows:

molar mass of carbon dioxide = 44.0 g/mol

molar mass of carbon = 12 g/mol

molar mass of water = 18 g/mol

molar mass of hydrogen = 1.0 g/mol

Moles of carbon dioxide = 2.31/44

Moles of carbon dioxide = 0.0525 moles

Moles of Carbon = 0.0525 moles

mass of carbon = 0.0525 * 12

mass of carbon = 0.105 g

Moles of water = 1.26/18

Moles of water = 0.07 moles

Moles of hydrogen = 0.07 * 2

Moles of hydrogen = 0.14 moles

mass of hydrogen = 0.14 * 1

mass of hydrogen = 0.14

mass of compound = 0.105 + 0.14

mass of compound = 0.245

Percentage mass of carbon = 0.105/0.245 * 100

Percentage mass of carbon = 42.8%

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The statement among the available options that describes the result of the study is that less than 50% of the people never felt phantom pain. Option 2.

In order to interpret the data and find the best description of the outcome of the experiment, the response needs to be grouped into 2 from the 3 available responses.

Since those that phantom pain sometimes and always belong to the same category, the respondents can be summed up into one:

Number of those that sometimes feel phantom pain = 534

Number of those that always feel phantom pain = 193

Total number of people that feel phantom pain = 534 + 193

                                                                                = 727 people

Number of people that never feel phantom pain = 183

Total number of respondents in the experiment = 183 + 534 + 193

                                                                                = 910 people

Percentage of respondents that felt phantom pain = 727/910 x 100

                                                                                     = 79.89%

Percentage of people that never felt phantom pain = 183/910 x 100

                                                                                      = 20.11%

Percentage of people that felt phantom pain all the time = 193/910 x 100

                                                                                      = 21.21%

Thus, the statement that correctly describes the outcome of the experiment of all the statements is that less than 50% never felt phantom pain.

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False, the effusion of the gas will be faster than the carbon dioxide.

The process of a gas escaping from a container through a hole that is significantly smaller in diameter than the molecules' mean free route is known as effusion in physics and chemistry. The gas escape is caused by the pressure difference between the container and the outside, which is why such a hole is frequently referred to as a pinhole. Since there are almost no molecular collisions in the vicinity of the hole under these circumstances, nearly all molecules that reach the hole continue and pass through it.

Graham's law of effusion can be used to find the rate of effusion: rate of effusion is inversely proportional to the molar mass of the gas.

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The energy change associated with the transition from n = 2 to n = 5 in the hydrogen atom is 2.856 eV.

Planck's equation, E = h, relates the energy change connected to a transition to the frequency of the electromagnetic wave. The equation c = then links the wave's frequency to both its wavelength and the speed of light.

The expression for the change in energy for a transition from a state  to a state  in a hydrogen atom is

                             E = -13.6Z² (1/Nf² - 1/Ni²)

where Z is the atomic number, which is 1 for hydrogen. Substituting

Nf= 5 and Ni= 2

E = -13.6 × (1/ (5)²- 1/ (2)²)

E = -13.6 × - 0.21

E =  2.856 eV

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In order to properly balance an equation, we need to make sure that the same amount of elements on the reactants side matches the number of elements on the products side, we can do that by increasing the number in front of each molecule, the so called stoichiometric coefficient.

The proper balancing for this question is:

2 C2H2 + 5 O2 -> 4 CO2 + 2 H2O

Therefore the coefficients are:

2, 5, 4, 2

The substance must change into a new substance is the observation that scientist must list for a chemical reaction to happen.

A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present). The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry.

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The magnification will be 9x.

A telescope is a device which is used to watch the objects far away in the space. In this device, different lenses are used and a reflecting surface is also used.

This light is reflected on a large mirror surface and the telescope has eyepiece which helps to see the object.

The magnification is the function between the focal length and the distance through which object is to be viewed.

Here,

The magnification will be 450/ 50 = 9x

Therefore the magnification of the eyepiece will be 9x.

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Answer: B. Shared electrons

Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.

The Ka of an acid indicates how strong this acid is. This means that greater acidity constant Ka corresponds to stronger acids, and lower Ka corresponds to weakest acids. I the example the acetic acid (CH3COOH) has an acidity constant 6 order of magnitude greater than the HCO3- there fore acetic acid is stronger than HCO3-

Answer:

C is the answer

Explanation:

Answer:

in an ionic bond, atoms lose valence electrons and become positively charged

Explanation:

To clarify, the atom that loses the electrons becomes a positively charged ion (cation), and the atom that gains them becomes a negatively charged ion (anion).

iii. True. The existence of a vacancy in a crystal decreases the energy of the material.

One of the scientific disciplines called crystallography examines how the atoms in a solid crystal are arranged. When molecules are linked together in a regular way, these crystals are created.

The mechanical, physical, and optical properties of a material can alter when crystal flaws are present. The strength of the material can be impacted by a flaw.

An irregularity in the atoms' regular geometrical arrangement within a crystalline material is referred to as a crystal defect. These flaws are caused by the solid being deformed, cooling quickly from a high temperature, or being exposed to high-energy radiation (such as X-rays or neutrons). because the vacancy cause defects and the crystal structure is disturbed this causes a decrease in energy.

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To solve the question we need to:

Step 1 - Calculate the molar mass of BaF2

Step 2 - Use the following formula: moles = mass/molar mass

Step 1:

Atomic mass of Ba is 137.33 g/mol

Atomic mass of F is 19 g/mol

We can find these values at periodic table.

We multiply the atomic mass by the quantity of atoms of each element:

(1x137.33) + (2x19) = 175.33 g/mol

So the molar mass of BaF2 is 175.33 g/mol

Step 2:

moles = mass/molar mass

moles = 147/175.55

moles = 0.838 moles

Answer: 0.838 moles of BaF2

There are a lot of ionic compounds in fireworks, most of them are salts, like: Strontium Nitrate and Strontium Carbonate ( both in the color red); Calcium Carbonate and Calcium Chloride (orange); Sodium Nitrate, Sodium Oxalate (yellow); Barium Nitrate and Barium Carbonate (green) and so on. For the gunpowder itself we have the Potassium Nitrate as an ionic compound.

The chemical reaction for the combustion of black powder is:

6KNO3 + C7H4O + 2S -> K2CO3 + K2SO4 + K2S + 4CO2 + 2CO + 2 H2O + 3N2

It's not just a single reaction, but this is a general representation of it.

The question requires us to calculate the number of moles of NaCl in 1.66 L of a 0.400 M NaCl solution.

To answer this question, we need to keep in mind that the molar concentration provides the amount of moles in one liter solution. Thus, we can write that:

1 L of NaCl solution -------------- 0.400 mol of NaCl

We can use this information to calculate the amount of NaCl, in moles, in 1.66 L in a 0.400 M NaCl solution:

1 L of NaCl solution -------------- 0.400 mol of NaCl

1.66 L of NaCl solution --------- x

Solving for x, we have:

Therefore, there are 0.664 moles of NaCl in 1.66 L of a 0.400 M NaCl solution.

Answer:

Explanation:

Hi  Kiwi,   Atoms are very stable,  it takes a gigantic amount of energy to break them up.  Compounds (molecules) take far far less, and are rearranged all the time.   valence electrons are the electric force that stick molecules together.  it's relatively small, the energy to break up molecules.

a) Data:

F = 600 N

t = 1.5 s

The equation for Impulse:

Impulse = I = F x t,

then the change in momentum: pf - pi

Impulse and the change in momentum are related like this:

pf - pi = I = F x t = 600 N x 1.5 s = 900 N.s

Therefore the change in momentum: pf-pi = 900 N.s

b) Velocity (t) = initial velocity + a x t

We can assume initial velocity = 0 m/s

From F = m x a = mass x acceleration, we clear "a",

m = 275 g = 0.275 kg (1 kg = 1000 g)

Then, F/m = a => 600 N/0.275 kg = 2182 m/s^2

Velocity (t) = 0 + 2182 m/s^2 x 1.5 s = 3273 m/s

Velocity = 3273 m/s

Answer:

6.37g of iron are produced.

Explanation:

1st) From the balanced reaction we know that 1 mole of Fe2O3 reacts with 3 moles of H2 to produce 2 moles of Fe and 3 moles of H2O.

With the molar mass of Fe2O3 (160g/mol) and H2 (2g/mol) we can convert the moles to grams:

- Fe2O3 conversion: 1 mole is equal to 160g, so here it is not necessary to calculate the conversion.

- H2 conversion:

So, from the balanced reaction we know that 160g of Fe2O3 react with 6g of H2.

2nd) Now we have to find out which compound is the limiting reactant and which compound is the excess reactant, using the 9.1g and 16.8g given in the exercise:

So, the 9.1g of Fe2O3 will need 0.34g of H2 to react properly, but we have 16.8g of H2 so H2 is the excess reactant and Fe2O3 is the limiting reactant.

3rd) Using the limiting reactant, we can calculate the grams of iron that are produced.

It is necessary to use the molar mass of iron (56g/mol) to convert the 2 moles in the reaction to grams (2 Fe moles = 112g).

Finally, 6.37g of iron are produced.

Explanation:

The polarity of a bond is given by the difference in electronegativity between the two atoms that form said bond.

Answer:

sulfur and water

Explanation:

sulfur + water --> sulfuric acid

^ reactants. ^ product