Draw a cooling graph of water as it passes from 20°C to –20°C. The y-axis should be temperature in degrees Celsius and the x-axis should be time

Answer

be a crystalline solid

be soluble in water

conduct electricity

Explanation:

If a substance is ionic, then it will have these characteristics:

Ionic compounds are those compounds that are made by gain or losing electrons between of metal and non-metals. They are joined by ionic bonds, and ionic bonds are formed when there is electrostatic attraction between substances.

Ionic compounds dissociate into separated charged ions when they dissolve into a liquid. Example of ionic compounds are table salt, silver iodide, etc.

They contain a negative and a positive charge and are crystalline solid compounds. So, the overall compounds are neutral. They can conduct electricity.

Thus, If a substance is ionic, then it will likely have a metal and a nonmetal.

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The identity of element 'y' can be determined through the periodic table of elements by identifying its atomic number. Additional data like atomic mass, electron configuration, and properties can also be useful in definitively identifying the element.

To determine the identity of element 'y', you would need to refer to the periodic table of elements, which organizes all known elements according to their atomic number (i.e., the number of protons in an atom of that element). For example, if element y has 8 protons, it is oxygen; if it has 79 protons, it is gold. If you have more specific data about element 'y', such as its atomic mass, electron configuration, chemical behavior, or physical properties, you can use this information in conjunction with the periodic table to identify the element.

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Answer:

The answer is: A strong acid will produce a greater amount of ions than a weak acid.

Explanation:

The key difference between weak and strong acid is that weak acids partially ionize in water while strong acids completely ionize.

The answer is: A strong acid will produce a greater amount of ions than a weak acid.

The main difference between a strong and a weak acid is the extent of their ionization in water. Strong acids fully dissociate into ions, making them strong electrolytes, while weak acids only partially dissociate and are therefore weak electrolytes.

The difference between a strong acid and a weak acid lies in their ability to dissociate in water. A strong acid, like hydrochloric acid (HCl), dissociates completely in water, meaning it ionizes 100% into H+ (hydrogen ions) and its corresponding anion (e.g., Cl- for HCl), making it a strong electrolyte. On the other hand, a weak acid, such as acetic acid found in vinegar, only partially dissociates in water, resulting in a mixture of undissociated molecules and ions. Therefore, weak acids are considered weak electrolytes because they produce fewer ions in solution.

This distinction is crucial because it affects how the acid reacts in an acid-base reaction. While both strong and weak acids can react with bases, a strong acid will produce a larger amount of ions than a weak acid, which has a significant impact on the equilibrium and strength of the acid in solution.

Answer:

[tex]\boxed{\text{70 L}}[/tex]

Explanation:

We can use the Ideal Gas Law to solve this problem

pV = nRT

Data:

p = 1.1 atm

n = 3.2 mol

R = 0.082 16 L·atm·K⁻¹mol⁻¹

T = 295 K

Calculation:

[tex]\begin{array}{rcl}1.1V\text{ atm} & = & \text{3.2 mol} \times \text{0.082 06 L}\cdot\text{atm}\cdot\text{K}^{-1}\text{mol}^{-1} \times \text{295 K}\\1.1V & = & \text{77.5 L}\\\\V & = &\dfrac {\text{77.5 L}}{1.1}\\\\V & = & \text{70 L}\\\end{array}\\\text{The volume is }\boxed{\textbf{70 L}}[/tex]

The volume of 3.2 moles of chlorine gas at 295 K and 1.1 atm is calculated using the Ideal Gas Law and is approximately 69.89 liters.

The volume of 3.2 moles of chlorine gas (Cl2) at 295 K and 1.1 atm can be calculated using the Ideal Gas Law, which is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Firstly, let's rearrange the Ideal Gas Law to solve for V (volume):

V ={nRT}÷{P}

We plug in the values:

n = 3.2 moles

R = 0.0821 L atm / (mol K) (the ideal gas constant)

T = 295 K

P = 1.1 atm

So, the calculation is:

V = {3.2 × 0.0821 × 295}÷{1.1}

Calculation yields:

V ≈ 69.89 liters

Therefore, the volume of 3.2 moles of chlorine gas at 295 K and 1.1 atm is approximately 69.89 liters.

Answer:

A.  How does changing the amount of water affect the growth of corn?

Explanation:

To test this question, all you have to do is buy corn, and keep them all in the same area with the same amount of sunlight, temperature, etc, and only change the amount of water each plant gets.

~

Answer:

A.  How does changing the amount of water affect the growth of corn?

Explanation:

To test this question, all you have to do is buy corn, and keep them all in the same area with the same amount of sunlight, temperature, etc, and only change the amount of water each plant gets.

To calculate the number of grams of CO2 produced by the reaction of 50.6 g of CH4 with O2, we need to use the correct conversion factors. The first conversion factor to use is 1 mol CH4 / 16.0 g CH4, followed by 1 mol CO2 / 1 mol CH4, and finally 44.0 g CO2 / 1 mol CO2.

In order to calculate the number of grams of CO2 produced by the reaction of 50.6 g of CH4 with O2, we need to use the appropriate conversion factor. Based on the balanced chemical equation, we can see that the ratio between CH4 and CO2 is 1:1. Therefore, the correct conversion factor to use first is:

1 mol CH4 / 16.0 g CH4

This conversion factor allows us to convert the given mass of CH4 to moles of CH4.

Next, we can use the mole ratio from the balanced chemical equation to convert moles of CH4 to moles of CO2:

1 mol CO2 / 1 mol CH4

Finally, we can use the molar mass of CO2 to convert moles of CO2 to grams of CO2:

44.0 g CO2 / 1 mol CO2

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Answer:

Hi there!

The answer to this question is: True

Atoms make up an element

Answer:

True

Explanation:

Answer:

SnCl₂·2 H₂O.

Explanation:

Relative atomic mass data from a modern periodic table:

How many moles of SnCl₂ formula units in this sample?

The first mass 4.90 grams contain both the SnCl₂ formula units and a number of water molecules. Luckily, the mass of the dehydrated salt 4.10 grams contains only SnCl₂.

Formula mass of tin (II) chloride SnCl₂:

[tex]M(\rm SnCl_2) = 118.710 + 2\times 35.45 = 189.610\; g\cdot mol^{-1}[/tex].

Number of moles of tin (II) chloride SnCl₂ formula units in this sample:

[tex]\displaystyle n(\mathrm{SnCl_2}) = \frac{m}{M} = \rm \frac{4.10\; g}{189.610\; g\cdot mol^{-1}} = 0.0216233\; mol[/tex].

How many moles of water molecules H₂O in this sample?

Water of crystallization exist as H₂O molecules in typical hydrated salts. The molar mass of these molecules will be:

[tex]M(\rm H_2O) = 2\times 1.008 + 15.999 = 18.015\; g\cdot mol^{-1}[/tex].

The mass of water in the hydrated salt is the same as the mass that is lost when the water molecules are removed and the salt is dehydrated.

In other words,

[tex]\begin{aligned}m(\text{Water of Hydration})&=m(\text{Hydrated Sample}) - m(\text{Anhydrous Sample}) \\ & = \rm 4.90\; g - 4.10\; g \\ &= \rm 0.80\; g\end{aligned}[/tex].

[tex]\displaystyle n(\mathrm{H_2O}) = \frac{m}{M} = \rm \frac{0.80\; g}{18.015\; g\cdot mol^{-1}} = 0.0444074\; mol[/tex].

What's the coefficient in front of water in the formula of this hydrated salt? In other words, how many water molecules are there in the compound for each SnCl₂ formula unit?

[tex]\displaystyle \frac{n(\mathrm{H_2O})}{n(\mathrm{SnCl_2})} = 2.05 \approx 2[/tex].

There are approximately two water molecules for each SnCl₂ formula unit. The formula of this compound shall thus be [tex]\rm SnCl_2 \cdot 2H_2 O[/tex].

The correct chemical formula for the hydrated tin (II) chloride, given the mass change upon dehydration, is SnCl₂·2H₂O, reflecting that two water molecules are associated with each formula unit of the compound. Option A is correct.

To find the correct chemical formula for the hydrated tin (II) chloride (SnCl2), we begin by calculating the mass of water in the hydrate, which is obtained by subtracting the mass of the dehydrated compound (4.10 g) from the mass of the hydrated compound (4.90 g).

This gives us a mass of 0.80 g for the water. Next, we must calculate the moles of SnCl₂ and H₂O present. The molar mass of SnCl₂ is approximately 189.60 g/mol and that of H₂O is about 18.015 g/mol. The mass of SnCl₂ in the sample is 4.10 g, which equates to about 0.0216 moles of SnCl₂.

The mass of water is 0.80 g, which gives us approximately 0.0444 moles of water. The mole ratio of water to SnCl₂ is therefore 0.0444/0.0216, which simplifies to approximately 2. Therefore, the chemical formula that matches this hydration level is SnCl₂·2H₂O, indicating that each formula unit of tin (II) chloride is associated with two water molecules.

Hence, A. is the correct option.

The complete question is:

A sample of hydrated tin (II) chloride (SnCl₂) has a mass of 4.90 g. When it is dehydrated, it has a mass of 4.10 g. Which is the correct chemical formula for the hydrate?

A. SnCl₂•2H₂O    

B. SnCl₂•4H₂O    

C. SnCl₂•6H₂O

Answer:

hormones - the first choice

Answer:

hormones

Explanation:

Hormones are chemical signals secreted by the endocrine glands. Each cell has receptors for the hormone molecule. Hormone secreted in the blood binds to its specific receptor on the cell surface. After binding to its receptors hormones transfer signal to the interior of the cell. Hormones are responsible for the transduction of cell signal. A very common example of hormone is insulin.

Answer: Option (4)

Explanation: The most efficient radioactive method used for the determination of fossil age which is about one billion years old is the Potassium-Argon method (⁴⁰K-⁴⁰Ar).

Potassium-Argon method is generally used to date fossils which are more than 1.2 billion years old as its half life is almost about 1.2 billion years. Potassium is highly radioactive, which converts into Argon and becomes stable.

Uranium and Carbon are also highly radioactive whereas Lead and Nitrogen are stable elements.

¹⁴C-¹⁴N is not an efficient method as it has a half life of only about 5700 years.

Thus the correct answer is option (4).

Answer:

The answer is D) potassium, which is radioactive, and argon, which is stable

Explanation:

If you need any help with this question, please ask me! :)

Answer:

C) travel through solids and liquids

Explanation:

Though S waves can travel through solids, they cannot travel through liquids.

An ion is an atom with a net electric charge due to the loss or gain of one or more electrons.

An isotopeis each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties.

Answer:

A ion is an atom of the same element with different numbers of electrons.

A isotopes is an atom of the same element with different numbers of neutrons.

Answer:

D. 27.099 x 10²³.

Explanation:

So, 4.5 mol of Hg will contain:

(4.5 mol)(6.022 x 10²³) = 27.099 x 10²³ atoms.

So, the right choice is: D. 27.099 x 10²³.

Answer: [tex]27\times 10^{23}[/tex]

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

1 mole of [tex]Hg[/tex] contains = [tex]6.023\times 10^{23}[/tex] atoms of mercury

Thus 4.5 moles of [tex]Hg[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 4.5=27.099\times 10^{23}[/tex] atoms of mercury

Thus the number of atoms in 4.5 moles of mercury are [tex]27\times 10^{23}[/tex] atoms of mercury.

Answer:

False

Explanation:

Calcium is an element that belongs to the second group on the periodic table. Calcium has a valency of two and would readily loose both electrons in order to achieve stability when forming bonds.

It has 20 electrons.

Calcium would favor ionic bonds when combining with other atoms and by the virtue of this, it would readily transfer its two outermost electrons. This would make its atom mimic that of Argon-18.

The correct information is given below:

Element:                                        Calcium(Ca)

Electron structure of atom:      1S²2S²2P⁶3S²3P⁶4S²

Electron structure of ion:         1S²2S²2P⁶3S²3P⁶

Net ionic charge:                                 +2

The assertion in the table is incorrect. A calcium ion has an electron configuration of 1s22s22p63s23p6 and a net ionic charge of +2, not +1.

The provided electron configuration of the calcium ion is not accurate. The given configuration for the element of calcium (1s22s22p63s23p64s2) represents a neutral calcium atom, not a charged ion. When calcium becomes an ion, it loses two electrons to achieve a stable electron configuration (1s2 2s2 2p6 3s2 3p6), resulting in a net ionic charge of +2 for calcium, not +1. The electron configuration of Calcium ion should therefore be 1s22s22p63s23p6.

So, the assertion that all columns for calcium are filled out correctly in the table is ultimately false. Calcium loses two electrons when it becomes an ion, and therefore has a net ionic charge of +2, not +1.

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Answer:

Probably, 200 calories.

Explanation:

Answer:

2.5 g x 1 mol/18.02 g x 6.03 kJ/mol

Explanation:

use enthalpy of fusion for both thawing or freezing. The only difference for thawing or freezing would be that when freezing, energy is released (generated) and heat is on the product side, but when thawing , energy is consumed and it is on the reactant side. So for thawing or freezing use 6.03 kJ/mol.

Answer:

16.93%.

Explanation:

∴ The mass of 1.0 mol of Fe₃Al₂(SiO₄)₃ = (no. of moles of Fe₃Al₂(SiO₄)₃)(the molecular mass of Fe₃Al₂(SiO₄)₃)

∴ The mass of 1.0 mol of Fe₃Al₂(SiO₄)₃ = (1)(the molecular mass of Fe₃Al₂(SiO₄)₃) = (the molecular mass of Fe₃Al₂(SiO₄)₃).

∴ The mass of 1.0 mol of Fe₃Al₂(SiO₄)₃ = 3(atomic weight of Fe) + 2(atomic weight of Al) + 3(molecular weight of (SiO₄)₃) = 497.7474 g.

The mass of Si in 1.0 mole of Fe₃Al₂(SiO₄)₃ = 3(atomic mass of Si) = 3(28.0855 g/mol) = 84.2565 g.

∵ The mass % of Si = (the mass of Si)/(the mass of Fe₃Al₂(SiO₄)₃) = (84.2565 g)/(497.7474 g) = 16.93%.

Answer:

16.7%

Explanation:

Answer:

Sugar

Explanation:

Defintion of a solute-dissolved in the solvent, sugar dissolves in water and is therefore the solute

That would be solute.

A solute is the one that gets dissolved in the solvent. Here the solute is sugar and the solvent is water.

Answer:

The radius of a nitride ion is much larger than that of a nitrogen atom.

Explanation:

You are adding three extra electrons to the same energy shell.

This greatly increases electron repulsions.

The volume increases to give the electrons more room and decrease the repulsions.

The radius increases by a factor of 2.3 and the volume increases by a factor of 12.

The radius of the atom has been increased with the acquisition of the-3 charge.

The radius of an atom has been defined as the distance of the nucleus to the outermost electron. The loss and addition of electrons to the atom has results in the charge along with the change in radius.

The negative charge to the atom has been imposed with the gain of electrons. Thus, the nitrogen ion has been formed with the gain of 3 electrons.

The increase in the number of electrons results in the increased repulsion to the outermost electron from the nucleus. Thus, the radius of the atom has been increased with the acquisition of the-3 charge.

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Answer:

56.699 kilograms

Explanation:

1 pound (lb) is equal to 0.45359237 kilograms (kg).

The mass m in kilograms (kg) is equal to the mass m in pounds (lb) times 0.45359237

Answer:

d

Explanation:

rubber barely conducts electricity

Answer:

D: Conductivity

Explanation:

Study Island

Answer:

B- A form of solid precipitation that forms when raindrops freeze

Explanation:

A form of solid precipitation that forms when raindrops freeze best describes sleet.

The study of chemicals and bonds is called chemistry. There are two types of elements and these are metals and nonmetals.

The correct answer is option B which is A form of solid precipitation that forms when raindrops freeze

Hence, A form of solid precipitation that forms when raindrops freeze best describes sleet.

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Answer:

I think its higher

Explanation:

When an atom with 9 protons loses 2 electrons, it becomes a cation with a +2 charge. If it instead gains 4 electrons, it becomes an anion with a -4 charge.

Initially, an atom with 9 electrons and 9 protons is electrically neutral because the negative charges of the electrons perfectly counterbalance the positive charges of the protons. When an atom loses electrons, it becomes more positively charged or forms a cation.

Specifically, if it loses 2 electrons, it will have 7 electrons and 9 protons, resulting in a net charge of +2 as the calculation is 9 protons - 7 electrons = +2. This is represented as 2+.

Conversely, when an atom gains electrons, it becomes more negatively charged or forms an anion. If the atom gains 4 electrons to have 13 electrons and 9 protons, the net charge would be -4, since the calculation here is 9 protons - 13 electrons = -4. This is represented as 4-.

Therefore, the net charge will be -4.

Answer:

C) Electrons orbit the nucleus of an atom.

Explanation:

The amount of conductivity is the indicator of the number of ions in a solution, with higher ion concentrations leading to greater conductivity. This is crucial for predicting precipitation when solutions are mixed.

The indicator of the number of ions in solution is the amount of conductivity. This is because the concentration of ions in solution directly affects its conductivity. Strong electrolytes such as potassium nitrate (KNO3) will dissolve to form a high concentration of ions, leading to higher conductivity compared to weak electrolytes like acetic acid (CH3COOH), and especially non-electrolytes that do not form ions in solution. It is also worth noting that the temperature can affect conductivity, as higher temperatures increase the solubility of substances, potentially resulting in higher ion concentrations.

Understanding ion concentration is also essential in predicting whether a precipitate will form when two solutions are mixed. By calculating the ion product and comparing it to the solubility product constant (Ksp), chemists can determine the state of a solution (unsaturated, saturated, or supersaturated) and if a mixing of solutions will result in precipitation.

Answer:

Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent. It is measured in terms of the maximum amount of solute dissolved in a solvent at equilibrium. The resulting solution is called a saturated solution.

Explanation:

The solubility of a substance is the amount of substance that can dissolve in water (i.e solvent)

The solubility of a substance is the amount (either in mass or mole) of the substance (i.e solute) that can dissolve in a certain amount (either in litters or milliliters) of water (i.e solvent)

However, the solubility of substance is greatly influence by:

At a particular temperature and pressure, a substance may dissolve essentially well, while at other temperature, the solubility of the substance may be very low.

Thus, with the above information, we see that the solubility of substance is all about how the substance dissolve in water (i.e solvent) at a particular temperature and pressure.

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Answer:

D

Explanation:

D states a problem because of the population growing. Regulate means control and d stated that their was a problem and a need to control it. Therefore, d I'd really the only valid answer.

Final answer:

The need for population regulation is supported by the fact that a growing population intensifies environmental and social issues. Strategies like education and economic security can lead to lower birth rates, which is crucial for sustainable development and manageable population growth.

Explanation:

The statement supporting the need for population regulation is D) Billions more people on the Earth will intensify many environmental and social problems. This is because the carrying capacity of the Earth has been exceeded, leading to environmental degradation and resource depletion. Global efforts to curb population growth, such as China's one-child policy, have been both controversial and variably effective. Nonetheless, as the human population continues to increase, the pressures on food production, water resources, and global stability escalate, with the United Nations projecting potential population numbers ranging from 6 to 16 billion by 2100.

Population control is not just about reducing numbers; it's also about ensuring sustainable development and equitable resource distribution, which are vital for economic stability and avoiding social strife. Education, particularly for women, and the provision of economic security are recognized strategies that naturally lead to lower birth rates, thereby assisting in the management of population growth without the need for coercive policies.

Answer:

A

Explanation:

Answer:

Only some of the molecules of a weak base dissociate to produce hydroxide ions when mixed with water, but all of the molecules of a strong base dissociate to produce hydroxide ions.

Explanation:

Only some of the molecules of a weak base dissociate to produce hydroxide ions when mixed with water, but all of the molecules of a strong base dissociate to produce hydroxide ions.

Weak bases only partially dissociate in water, while strong bases fully dissociate. Strong bases produce more hydroxide ions, and they can react with acids to produce water.

The difference between a weak and a strong base lies in their ability to dissociate and produce hydroxide ions when mixed with water. Only some of the molecules of a weak base dissociate to produce hydroxide ions, while all of the molecules of a strong base dissociate to produce hydroxide ions. This means that a strong base has a higher concentration of hydroxide ions compared to a weak base. Additionally, strong bases react with acids to produce water, while weak bases do not react at all.

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