determine how many grams of kno3 would dissolve in 100g of water at 50 degrees celcuis to make a saturated solution

Answer:

I got 1 ulcers definition. an open score on an external

Answer:

2.78

Explanation:

When multiplying, your answer will have the same amount of sig figs as the multicand or multiplier that has the lower number of sig figs. In this case, 4.03 is the one with the lowest number of sigs figs, which is 3 sig figs, so the answer should have 3 sig figs, so the answer is 2.78.

Answer:

it is very easy why you can't know it

Answer:

Having difficulties !!! screen shotted it :)

16. H20 - Covalent

17. Mn(NO2)2 - Ionic and called Manganese(II) nitrate

18. HgO - Ionic

19. Li3N - Covalent

Answer:

I THINK expose all six plants to green light

Explanation:

True. The statement “the coefficients in a balanced chemical equation directly represent moles of reacting substances” is true. Coefficients in a balanced chemical equation serve as the mole ratios of reactants and products, which provide an indication of the number of moles of each chemical involved in a reaction.

The mole ratio is a conversion factor used to convert the number of moles of one substance into the number of moles of another substance in the chemical equation. It represents the number of moles of each substance involved in a balanced chemical equation and also represents the number of molecules involved in a chemical reaction.
Coefficients in a balanced chemical equation help to identify the number of molecules or moles of each substance involved in a chemical reaction.

The coefficients represent the number of moles of each substance needed to complete a chemical reaction, and the mole ratios of reactants and products are equal to these coefficients. They enable the chemist to determine the limiting reagent and the amount of product that can be formed in a reaction. The mole ratios of reactants and products in a balanced chemical equation are very important for predicting the outcomes of chemical reactions.

If the coefficients in the balanced chemical equation are not balanced, it would be difficult to predict the amount of product that can be produced by a reaction. Therefore, it is important to balance chemical equations before using them to predict the outcomes of chemical reactions. In conclusion, the statement “the coefficients in a balanced chemical equation directly represent moles of reacting substances” is true.

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(a) The decay rate of radioisotopes decreases with time according to the exponential decay formula:

decay rate = initial decay rate × (1/2)^(time/half-life)

given Assign a value.

35.0 decay/sec = initial decay rate × (1/2)^(7000 years / 5730 years)

Solving for the initial decay rate, the wood sample when the tree was felled had about 67.8 decay/sec.

(b) The total nuclear binding energy can be calculated using the formula:

Binding Energy = Nuclear Mass - (Proton Mass + Neutron Mass)

We need the nuclear mass. Find the proton mass and neutron mass. The mass of the atomic nucleus can be obtained from the atomic mass listed in the periodic table. For 14C, it is 14.003241 amu. The masses of protons and neutrons can be found by looking them up in the table of atomic masses. A proton has a mass of 1.007276 amu and a neutron has a mass of 1.008665 amu.

Using these values, the total binding energy of 14C can be calculated. Converting to meV, we find that the total binding energy of 14C is about -7.8 meV.

(c) Energy is released when two 7Li nuclei collide to form a 14C nucleus. This can be calculated using the formula:

q value = (final nuclear mass - initial nuclear mass) × c^2

where c is the speed of light.

Substituting the values ​​given in the question, we get: We can see that the emitted energy is about 17.3 mev.

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The wall of copper (thermal conductivity = 400 W/m*K) that needs to provide the same insulation as a 4-cm polystyrene board (thermal conductivity = 0.04 W/m*K) must have a thickness of 400 meters.

The insulation of a material is directly proportional to the R factor. The higher the R the higher is the insulation of the material.

The R factor is given by:  

\( R = \frac{L}{k} \)   (1)

Where:

L: is the thickness

k: is the thermal conductivity

The thickness of the copper wall can be calculated with equation (1):

\( L_{copper} = R*k_{copper} \)

Where:

\( k_{copper} \): is the thermal conductivity of copper = 400 W/(m*K)  

Since the copper wall must provide the same insulation as a polystyrene board, we have:

\( L_{copper} = R*k_{copper} = \frac{L_{polystyrene}}{k_{polystyrene}}*k_{copper} = \frac{0.04 m}{0.04 W/(m*K)}*400 W/(m*K) = 400 m \)

Therefore, the copper wall must have a thickness of 400 meters.

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I hope it helps you!  

The greatest and lowest attraction for electrons is found in upper right-hand corner and  lower left-hand corner respectively.

The attraction of an atom's nucleus for its electrons is determined by its atomic number, which corresponds to the number of protons in the nucleus.

As we move across a period from left to right in the periodic table, the atomic number increases, and the attraction for electrons increases as well. Therefore, the greatest attraction for electrons is found in the upper right-hand corner of the periodic table. This is where the nonmetals are located. In contrast, as we move down a group or column in the periodic table, the atomic number increases, but the attraction for electrons decreases because the electrons are further from the nucleus.

Therefore, the lowest attraction for electrons is found in the lower left-hand corner of the periodic table where the alkali metals and alkaline earth metals are located.

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Based on LeChatelier's principle, (option a) Release of CO₂ and (option c) Conversion of NADH to NAD+  are favorable reactions in the context described.

According to LeChatelier's principle, a reaction is favorable when it is driven in the direction that helps to counteract an imposed change. Among the given options:

a. Release of CO₂: LeChatelier's principle would favor this reaction if the system is subjected to an increase in pressure, as the equilibrium would shift towards the side with fewer gas molecules to reduce the pressure.

b. Enol to Keto tautomerization: LeChatelier's principle is not directly applicable to this reaction, as it involves a tautomeric shift between different forms of the same molecule rather than a change in equilibrium.

c. Conversion of NADH to NAD+ : LeChatelier's principle would favor this reaction if the system is subjected to an increase in NADH concentration, as the equilibrium would shift towards the conversion of NADH to NAD+ to counteract the increase.

d. Diffusion of protons down the gradient: LeChatelier's principle is not directly applicable to this process, as it involves the movement of particles along a concentration gradient rather than a change in equilibrium.

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Answer:

The current of the toaster is 3.93A

Explanation:

Using the GRASS method:

G: Given: The information that is given is that we have 28Ω of Resistance and 110V of voltage.

R: Required: We need to find the current measured.

A: Action: We can use Ohm's law that relates resistance, voltage and current in the equation:

V = R*I

Or:

I = V/R

Where I is current in A, V is voltage = 110V and R is resistance = 28Ω

S: Solve:

I = 110V / 28Ω

I = 3.93A

S: Statement:

Answer:

An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton).

Answer:

Atoms consist of an extremely small, positively charged nucleus in which the protons and neutrons can be found, and is surrounded by a cloud of negatively charged electrons.

Explanation:

All the elements in one group have the same number of valence electrons. The valence electrons are those on the energy level the most distant from the nucleus. These valence electrons are those involved in bonding with other atoms to form compounds.

In the periodic table elements in the same group posses similar physical and chemical property and this is due to the similarity in the number of valence electrons found in their  valence shells.

While in the periodic table as we move down a group the atomic number of the elements will continue to increase because elements in the same group are located in different periods as well.

Hence we can conclude that the difference in the elements located in a group is that they have different atomic numbers while the similarities is that the posses the same number of valence electrons.

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If the natural spring that feeds the river in Texas were to stop flowing, it would have a significant impact on the river's ecosystem. The river's water level would gradually decrease, and it could even dry up completely in severe cases. This could lead to a loss of habitat for many aquatic species that depend on the river for survival. The lack of water could also result in the death of fish and other organisms that rely on the river's ecosystem.

Furthermore, the river's water quality could also be negatively affected. The spring water that flows into the river is likely to be clean and free of pollutants, but without it, the river's water quality could be compromised. Other sources of water that may flow into the river could contain pollutants or contaminants, leading to degraded water quality.
In addition to the impact on the ecosystem, the river's recreational use could also be affected. The swimming pool that is fed by the spring would no longer have a source of water, making it unusable. The decrease in the river's water level could also make it difficult for recreational activities such as fishing and boating.
Overall, the loss of the natural spring that feeds the river would have a significant impact on the river's ecosystem, water quality, and recreational use. It is essential to protect and conserve natural resources such as springs and rivers to maintain a healthy and sustainable environment for all living organisms

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To calculate the hydrogen ion concentration, [H+], in mol/L for household ammonia at pH 11.5, we need to use the equation: pH = -log[H+]. Rearranging this equation, we get [H+] = 10^-pH.
Substituting the given pH value of 11.5, we get [H+] = 10^-11.5 mol/L.

The pH scale is a measure of the acidity or basicity of a solution. pH values range from 0 to 14, with 7 being neutral, below 7 being acidic, and above 7 being basic or alkaline.

When a solution is basic, it has a low concentration of hydrogen ions, [H+], and a high concentration of hydroxide ions, [OH-]. In contrast, acidic solutions have a high concentration of [H+] and a low concentration of [OH-].

Household ammonia is a basic solution with a pH of 11.5. This means that it has a low concentration of [H+] and a high concentration of [OH-]. By using the equation [H+] = 10^-pH, we calculated the [H+] concentration to be 3.16 x 10^-12 mol/L. This value is very small, indicating that household ammonia is a highly basic solution.

In conclusion, the hydrogen ion concentration, [H+], in mol/L for household ammonia at pH 11.5 is 3.16 x 10^-12. Understanding the pH scale and how to calculate [H+] concentrations is important in chemistry and biology, as it helps us understand the properties and behavior of different solutions.

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The freezing point measured for water the purity of water is: The water is not pure because the freezing point is lower than expected. Option D is correct.

Pure water freezes at 0 degrees Celsius (32 degrees Fahrenheit) at standard atmospheric pressure. However, impurities in water, such as dissolved salts or other substances, can lower the freezing point of the water. This means that the freezing point of impure water will be lower than 0 degrees Celsius.

Therefore, if the measured freezing point of water is lower than 0 degrees Celsius, it indicates that the water is not pure and contains impurities. The extent to which the freezing point is lower than expected can give an indication of the amount and nature of the impurities present in the water.

Hence, D. is the correct option.

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--The given question is incomplete, the complete question is

" What does the freezing point measured for water tell you about the water's purity? A) the water is not pure, but the thermometer is not very accurate. B) the water is not pure because the freezing point is higher than expected. C) the water is pure because the freezing point is exactly as expected. D) the water is not pure because the freezing point is lower than expected."--

The syringe heated up due to the formation of side product bromobenzene which leads to the whitish appearance.

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Answer;

Water 1.0 g/mL 100°C colorless liquid

Explanation:

thats the answer

Answer:

ethanol

Explanation:

just did it in study island

Answer:

Caustic soda

Explanation:

The fractional distillation of air is carried out on liquid air. Before air is liquified, the carbon dioxide content of air is removed using caustic soda. The air is then compressed to a pressure of about 200 atm, sudden expansion of the gas leads to cooling. The process continues until air becomes liquid at  -200°C.

Fractional distillation of liquid air usually produces nitrogen and oxygen as major products. nitrogen in obtained first since it has a lower boiling point than oxygen. The gases are then dried, compressed and stored in cylinders.

The common intermolecular forces involved between dye molecules and fabric fibers include dipole-dipole interactions, London forces, and hydrogen bonding.

The fibers that are mentioned in the test fabric are bamboo, wool, linen, cotton, nitrile, silk, polyester, Tencel, acetate, nylon, rayon, and acrylic. However, it is not specified which fibers are being analyzed for the intermolecular forces.

Intermolecular forces are the forces of attraction or repulsion that occur between molecules. These forces determine many of the physical properties of materials, including their melting and boiling points, viscosity, and solubility. When dyes are applied to fabric, the intermolecular forces between the dye molecules and the fabric fibers play a critical role in determining how well the dye adheres to the fibers and how well it resists fading.

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Answer:

True

Explanation:

Both work because an element would be pure and compounds can be split into elements. This will work unless the substance isnt chemcially pure, but in this case it is so the answer would be true.

Answer:

The process to use this knowledge is explained as below:

Explanation:

1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.

2. If the field or the farm has alkali soil add acid to reduce the pH value.

3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.

4. It will be a neutralization reaction and changes the pH value of the farm.

5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.

6. The pH value will need to be regularly monitored and adjusted.

The correct answer is the option a) acidic. A solution at room temperature with a pH of less than 7 will be acidic.

Acids and bases are two types of chemical compounds that are important to human life. Acids are substances that have a pH of less than 7. They taste sour and, when mixed with a base, form a neutral substance. Acids are often used in industrial processes, such as cleaning or etching metals, as well as in medicine.

Bases are substances that have a pH of greater than 7. They taste bitter and have a slippery feel. When mixed with an acid, they form a neutral substance. Bases are commonly used in cleaning products and in the production of fertilizers and plastics.

A solution at room temperature with a pH of less than 7 will be acidic.

Therefore, the correct answer is (a) Acidic.

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Answer: The statement they have one electron in the outermost electron shell. These are very active metals and easily lose their single valence electron, is true.

Explanation:

Metals are the species which tend to lose electron(s) to acquire stable noble gas configuration.

Elements which tend to lose a single electron in order to acquire stability are active in nature because losing one electron is more easy as compared to losing two or more electrons.

For example, atomic number of sodium is 11 and its electronic distribution is 2, 8, 1.

Since, it contains only one valence electron and by losing it sodium will acquire stability. Hence, sodium is a very reactive metal.

Thus, we can conclude that the statement they have one electron in the outermost electron shell. These are very active metals and easily lose their single valence electron, is true.

Answer: 10.7 grams

Therefore, 10.7 grams of Hydrogen are necessary to fully react with 50.0 grams of Nitrogen.

Answer:

An acid is the specie which can donate a proton.

Explanation:

Bronsted lower acid:

An acid is the specie which can donate a proton.

Bronsted lower base:

A base is the specie that can accept the proton.

For example:

HCl + NH₃     →       NH₄⁺ + Cl⁻

Here in this reaction HCl is act an acid because it donate the proton while NH₃ is Bronsted lower base because it accept the proton.

Bronsted lowery acid = proton donor

Bronsted lowery base = proton accepter

Answer:

See explanation

Explanation:

I believe that the aim of the scientist is to determine the effect of a cancer drug on mice with lymphoma. In this experiment, the mice with lymphoma are exposed to the drug. This is the treatment in the experiment. A control group of mice having lymphoma is not exposed to this treatment, this is the control group. This control group establishes a baseline for the study.

By comparing the outcome of the experimental and control groups, the effect of a cancer drug on mice with lymphoma can be determined.