For this experiment, the melting point will be used for which of the following qualitative purposes? 00000 Select all that are True. To determine the eutectic melting point of the impure solid. To determine the purity of the recrystallized solid. To determine the amount of impurity that was present in the unknown solid. To determine the identity of the unknown solid.

Explanation:

sexual reproduction has minimal changes of mutations compared to asexual reproduction

Answer:

sexual reproduction has minimal changes of mutations compared to asexual reproduction

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Answer:

The kinetic energy will increase and the pressure of the gas will also increase.  D

Explanation:

Answer:

Drought

Explanation:

It would get really dry because no moisture and the lakes would dry up bc of lack of water

The volume of the balloon after it cools is 0.68 L.

Charles law states that the volume of a gas is directly proportional to its temperature at constant pressure.

It is given by:

V ∝ T

V/T = constant

Therefore:

\(\frac{V_1}{T_1}=\frac{V_2}{T_2} \\\\V_1=2.6\ L,T_1=293\ K,T_2=77\ K:\\\\\frac{2.6}{293}=\frac{V_2}{77} \\\\V_2=\frac{2.6}{293}*77\\\\V_2=0.68\ L\)

Hence the volume of the balloon after it cools is 0.68 L.

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Camels lose less water through their urine and feces than many other mammals. Their kidneys concentrate water heavily, leading to salty urine. The intestines also reabsorb water from intestinal material as it is digested, so dry feces are produced.

Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer: Na2CO3 + 2 HCl → 2 NaCl + H2CO3

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So,

Given the reaction:

The initial mass of Mg was 0.326, and, in the real experiment, we obtained 0.528 grams of MgO. Right?

Now, let's find the amount of MgO supposed to obtain according to the chemical equation:

Now, the amount that we were supposed to obtain, was 0.54g of MgO. (The result of mutiplying all the previous operations). This is the theoretical yield, what we obtained using the theory.

Now, as you discovered, the mass of MgO in the laboratory was 0.528g so that's the actual yield. This is, what you've found using the experimental process.

Finally, the percent yield can be found using the following equation:

And, we know both values, so let's just replace:

The answer would be \(2.79\) × \(10^{5}\ ml\).

When you have a big number and have to make it smaller, the exponent will be positive therefore \(10^{5}\) and always remember that you have to round. It asks for 3 significant figures so you look at the last digit you need, which is 8, and then look to the right of it to see if you will need to round up or down. Since the number to its right is a 6, that means that you have to round up therefore the answer is \(2.79\) instead of \(2.78\).

Answer:

d. Using leaded gasoline in automobiles.

Explanation:

The use of leaded gasoline is not used to reduce the amount of acid rain, because the element lead it is not part os the elements that produced the acid rain.

Answer:

AuW₃

Explanation:

Answer:

0.517

Explanation:

HCN + NaOH → NaCN + H2O [balanced as written]

(35.4 mL) x (0.268 M NaOH) x (1 mol HCN / 1 mol NaOH) / (18.35 mL HCN) = 0.517 M HCN

Answer: 0.517

Explanation:

Answer:

the  number of laps in the case when he run for 50 minutes is 18,333.33

Explanation:

The computation of the number of laps in the case when he run for 50 minutes is shown below:

Given that

He runs 440m lap in 1.2 minutes

So in 50 minutes he can have laps of

= 440 × 50 ÷ 1.2

= 18,333.33 laps

hence, the  number of laps in the case when he run for 50 minutes is 18,333.33

Answer:

Cr2as is the chemical formula of chromium arsenate

The change in the velocity = 4 m/s

Acceleration = 4 m/s²

Given

vo = initial velocity = 4 m/s

vf = final velocity = 8 m/s

t = 1 s

Required

The change in the velocity

Acceleration

Solution

the change in velocity =

\(\tt vf-vo=8-4=4~m/s\)

Acceleration = ratio of a change in velocity and the time

\(\tt a=\dfrac{\Delta v}{t}= \dfrac{vf-vo}{t}\)

Input the value :

\(\tt a=\dfrac{4~m/s}{1~s}=4~m/s^2\)

That will equate to twice as many moles of oxygen. That is three times that. As a result, we obtain six moles of H2 as the number of moles.

Water (H2O) is composed of two hydrogen atoms and one oxygen atom. Two moles of hydrogen atoms and one mole of oxygen atoms make up a mole of water molecules.

The mole is the most practical unit for counting particles. Hence, the balanced chemical equation informs us that 1 mole of nitrogen reacts with 3 moles of oxygen if each coefficient is multiplied by a mole.

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The atomic mass of the reactants equals the atomic mass of the product, and the product has the same.

The conservation of mass is a fundamental principle in physics and chemistry that states that the total mass of a system remains constant, regardless of any changes that take place within the system. In other words, mass cannot be created or destroyed, only transformed from one form to another.

This law applies to both physical and chemical processes, and is a key concept in fields such as thermodynamics, mechanics, and material science. It forms the basis for our understanding of the behavior of matter and energy in the universe, and is widely used in scientific and engineering calculations and experiments.

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Answer:

1. the reactants and the products have the same number of atoms of the same elements

2. the mass of one titanium atom is equal to the mass of four carbon atom

3. The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of atoms as the reactants.

4. 80amu

5. A molecule with two atoms combined with a molecule with three atoms to produce a molecule with a mass of 84 u.

Explanation: got 100% hope you get the same!

Answer:

D. Directly to The Right

Answer:

Number of protons in Carbon - 14 atom \(6\)

Explanation:

The atomic number of carbon 14 atom is \(14\)

Number of neutrons in the nucleus of Carbon-14 atom \(= 8\)

Atomic number is equal to the sum of neutrons and protons

Number of protons in Carbon - 14 atom \(= 14 -8 = 6\)

46. Covalent bonds are formed by sharing electrons between atoms.

Covalent bonds are chemical bonds formed when two atoms share electrons. They occur between nonmetal atoms and involve the sharing of electron pairs, resulting in the formation of a stable molecule. Covalent bonds are typically found in molecular compounds.

47. Ionic bonds are formed by gaining or losing electrons between metals and nonmetals.

48. A subscript is used in a formula to indicate the number of atoms of an element in a compound.

49. Chemical reactivity or stability depends on the number of outer energy levels (valence shells) in atoms.

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The mass of the solid aluminum that forms are 192.73 grams

To determine the mass of solid aluminum that forms, we need to use stoichiometry and the balanced chemical equation for the reaction between magnesium and aluminum nitrate.

The balanced chemical equation is:

3 Mg + 2 Al(\(NO_{3}\))3 → 3 Mg(\(NO_{3}\))2 + 2 Al

The equation shows that 3 moles of magnesium react with 2 moles of aluminum to produce 2 moles of aluminum nitrate.

To calculate the mass of solid aluminum, we need to know the amount of magnesium used. Given that the volume of the magnesium is 150.0 mL and its density is 1.738 g/cm³, we can calculate the mass of magnesium using the formula:

Mass = Volume × Density

Mass of magnesium = 150.0 mL × 1.738 g/cm³ = 260.7 g

Now, using the molar mass of magnesium (24.31 g/mol) and the molar ratio from the balanced equation, we can determine the moles of magnesium used:

Moles of magnesium = Mass of magnesium / Molar mass of magnesium

= 260.7 g / 24.31 g/mol

= 10.72 mol

According to the stoichiometry of the balanced equation, the ratio of moles of magnesium to moles of aluminum is 3:2. Therefore, the moles of aluminum formed will be:

Moles of aluminum = (2/3) × Moles of magnesium

= (2/3) × 10.72 mol

= 7.15 mol

Finally, we can calculate the mass of solid aluminum using its molar mass (26.98 g/mol):

Mass of aluminum = Moles of aluminum × Molar mass of aluminum

= 7.15 mol × 26.98 g/mol

= 192.73 g

Therefore, the mass of the solid aluminum that forms is approximately 192.73 grams.

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The number of moles in 72 gram H₂O is 3.942 MOL.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

First, know the molar mass of water.

The given mass is 71 gram

\(\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{71}{18.01}= 3.942 mol\)

Thus, the number of moles in 72 gram H₂O is 3.942 MOL.

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The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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Each of the following organs had a role in excretion, except for the Heart. Therefore, the correct option is option C.

Excretion seems to be the process throughout which an organism eliminates metabolic waste. In vertebrates, this is largely done by that of the skin, kidneys, especially lungs. When a substance is secreted, this could perform certain roles once it leaves the cell. Excretion is required by all forms of life.

Animals, for example, use the urethra, a member of the excretory, to evacuate urine. In unicellular organisms, waste products are ejected quickly via the cell surface. During biological functions, such as cellular respiration, a variety of chemical changes occur in the body. Each of the following organs had a role in excretion, except for the Heart.

Therefore, the correct option is option C.

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7.11 × 10⁻⁴ is the solubility (in M) of PbCl\(_2\) in a 0.15 M solution of HCl. The Ksp of PbCl\(_2\) is 1.6 x 10⁻⁵.

The capability of a material, the solute, to combine with another material, the solvent, is known as solubility in chemistry. Insolubility, or the solute's inability to create such a solution, is the opposite attribute.

The amount of each of the solute within a saturated solution—a solution whereby no more solute is able to be dissolved—is typically used to gauge the degree of a substance's solubility in a particular solvent.

PbCl\(_2\) ⇌ Pb\(_2\)⁺(x) + 2Cl⁻ (2x)

HCl ⇌H⁺ (0.15M) + Cl⁻ (0.15M)

Ksp = {Pb\(_2\)⁺} {Cl⁻}²

Ksp = {x} {2x+ 0.15}²

2x<0.15

Ksp = {x} {0.15}²

x = 7.11 × 10⁻⁴

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Answer:

In a climatological sense, dryness is a function of both annual rainfall and evaporation

The ΔS° value for the reaction KCl(s) → K+(aq) + Cl−(aq) is ΔS° > 0, as the products have a higher degree of disorder than the reactant due to an increase in the number of particles in solution. Hence the correct option is (C) ΔS° > 0.

The ΔS° value for a reaction represents the change in the entropy of the system, which is a measure of the disorder or randomness of the system. The reaction KCl(s) → K+(aq) + Cl−(aq) involves a solid compound breaking down into two separate aqueous ions, which means that the products have a higher degree of disorder than the reactant. This increase in the number of particles in solution results in an increase in entropy, which means that ΔS° > 0. Option (A) is incorrect because the reaction involves a change in state, which results in an increase in entropy. Option (B) is incorrect because it represents the relationship between enthalpy and entropy, not the ΔS° value for this particular reaction. Option (D) is incorrect because the reaction results in an increase in entropy, not a decrease. Option (E) is incorrect because the given information is sufficient to predict the sign of ΔS°.

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Answer:

that is a solid and that there are other ways to make a fire?