Sulfur is often found in nature as an element, not combined with other elements in a compound. What does
this fact tell you about the reactivity of sulfur?

Answer:

42.2075 grams

Explanation:

the answer for this question is Mister

Answer:

264g

Explanation:

C + O2 -> CO2

_g + _g -> 396g

396÷3=132

C (132g) + O2 (264g) -> CO2 (396g)

Answer:

The correct answer is - option C.

Explanation:

Given: the melting point of HCl is

-114.8 °C, which suggests that below this temperature HCl will be solid.

and, since the boiling point of HCl is - 85.1 °C. It is also suggested that above this temperature HCl will be gas, Therefore.

Solid -114.8  - Ordered arrangement

Liquid -85.1c  - Less orderly arranged

Gaseous - Least orderly arranged

Thus, at —90 °C, HCl will be present 'in the liquid state,  At — 1 °C, HCl will be present in the gaseous state and at -129 °C, HCl will be present in the solid-state. So, the molecules will be organized in a more orderly manner .

Thus, the correct answer is - option C

The type of system that uses circulating pumps and fans to collect and distribute heat is called a "hydronic heating system" or "forced air heating system."

In a hydronic heating system, circulating pumps are used to circulate heated water or another fluid through pipes or tubing. The heated fluid transfers heat to various components of the system, such as radiators, baseboard heaters, or radiant floor heating systems. The pumps ensure that the hot fluid is continuously circulated, maintaining a consistent and comfortable indoor temperature.

On the other hand, a forced air heating system utilizes fans or blowers to distribute heated air throughout a building. The system typically consists of a furnace or heat pump that heats the air, and the heated air is then pushed through a network of ducts using fans or blowers. The air is directed to various rooms or areas through registers or vents, providing warmth and comfort.

Both hydronic heating systems and forced air heating systems are commonly used in residential, commercial, and industrial buildings to provide efficient and effective heating. The specific type of system chosen depends on factors such as the heating requirements, building design, energy efficiency goals, and personal preferences.

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Answer:

X5Y2

Explanation:

% composition of X = 52.2%

% composition of Y = (100 - 52.2) = 47.8%

This means that there are 52.2g of X and 47.8g of Y in the compound

To calculate the empirical formula of the compound, we first convert the gram value to mole value by dividing by their molar masses.

X = 52.2g/42.3g/mol = 1.234mol

Y = 47.8g/96.7g/mol = 0.494mol

Next, we divide each mole value by the smallest value (0.494mol)

X = 1.234mol ÷ 0.494mol = 2.49

Y = 0.494mol ÷ 0.494mol = 1

We multiply each value by 2

X = 2.49 × 2 = 4.98

Y = 1 × 2 = 2

The simple ratio of X:Y is 5:2, hence, their empirical formula is X5Y2.

Sulfur dioxide is used as a food preservative, disinfectant, etc.

The ions formed when MgI2 dissociates in water are Mg2+ and I− ions. Due to their great water solubility, these salts are typical ionic halides.

Iodine anion I2+ and magnesium cation Mg2+ interact structurally. It exists in anhydrous form with a hexagonal crystal structure, hexahydrate form with a monoclinic structure, and octahydrate form with an orthorhombic structure.

When magnesium iodide is dissolved in water, it totally dissociates to form magnesium cations and iodide anions in the aqueous solution.

The Mg2+ ion contains 10 electrons. A magnesium atom that is neutral would have 12 electrons to counteract the positive charge of the atom's 12 protons. An ion must possess more protons than electrons in order to be positively charged.

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Explanation:

2. The periodic table of elements is a tabular representation of chemical elements, organized on the basis of their atomic numbers

3. a. Mg

c.Fe

b.K

d. Cu

4. a.carbon

b.chlorine

c.aluminum

d.strontium

5. a. 5 group 18 element

b. 5 group 13 element

d. 5 group 17 element

c. 5 group 1 element

6. a. 3 group

b. 4 group

c. 5 group

d.4 group

7. I don't know

and.... you're welcome :))❤️

The heat of solution (qsoln) for the neutralization reaction between nh3 and hcl can be calculated using the heat of neutralization equation: qsoln = -qrxn/moles of solute. The reaction between nh3 and hcl is an exothermic reaction, meaning it releases heat. The balanced chemical equation for the reaction is:

NH3 (aq) + HCl (aq) → NH4Cl (aq)

To calculate qsoln, we need to know the amount of heat released (qrxn) and the number of moles of solute. The heat of neutralization for this reaction is -51.4 kJ/mol. This means that for every mole of NH3 and HCl that react, 51.4 kJ of heat are released. To determine the number of moles of solute, we need to know the amount of NH3 and HCl present in the reaction.

Let's say we have 100 mL of a 0.1 M NH3 solution and we add 50 mL of a 0.1 M HCl solution to it. The total volume of the solution is 150 mL, and the total number of moles of NH3 and HCl is:

moles of NH3 = (0.1 mol/L) x (0.1 L) = 0.01 moles
moles of HCl = (0.1 mol/L) x (0.05 L) = 0.005 moles

The limiting reactant is HCl, so we can use its moles to calculate qsoln:

qsoln = -qrxn/moles of solute
qsoln = -(-51.4 kJ/mol)/(0.005 mol)
qsoln = 10,280 kJ/mol

Therefore, the heat of solution (qsoln) for the neutralization reaction between NH3 and HCl is 10,280 kJ/mol.

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The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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Answer:

a rain of asteroids coming from space

Explanation:

The organic molecule CH2OCH2CHOH is a diol, which means it contains two hydroxyl (-OH) groups. It is also known as ethylene glycol, and it has the molecular formula C2H6O2.

Ethylene glycol is a colorless, odorless, and sweet-tasting liquid that is commonly used as a solvent, antifreeze, and in the production of polyester fibers and resins.

It is also highly toxic if ingested, as it can cause kidney failure and other serious health problems.

Therefore, it is important to handle ethylene glycol with care and follow proper safety precautions when using it in laboratory or industrial settings.

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Fatty acid groups are referred to as B) acyl groups.

Fatty acids are organic compounds that consist of a long hydrocarbon chain with a carboxyl group (-COOH) at one end. The hydrocarbon chain is composed of carbon and hydrogen atoms, and its length can vary. Fatty acids play essential roles in various biological processes and are major components of lipids, including triglycerides and phospholipids.

When a fatty acid is involved in chemical reactions or is attached to other molecules, it typically undergoes a process called activation, where it is converted into an acyl group. An acyl group is formed by replacing the -OH (hydroxyl) group of the carboxyl group with an -OR (alkoxy) group. The -OR group can be derived from various molecules, such as coenzyme A (CoA) or other acyl carrier proteins.

For example, when a fatty acid is activated for incorporation into a triglyceride molecule, it forms a triglyceride acyl group. Similarly, when a fatty acid is incorporated into a phospholipid molecule, it forms a phospholipid acyl group. The acyl group represents the hydrocarbon chain of the fatty acid, which may vary in length and saturation.

Therefore, the correct answer to the question is B) Acyl.

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Answer:

8.9 grams of Cu (copper).

Explanation:

We have a balanced equiation, so lets solve this by first converting the Cu₂O to moles and then use the equation coefficients to find the moles of Cu we should expect to find.

10 grams of Cu₂O is (10 g/(143.1 g/mole) =0.070 moles of Cu₂O.

The balanced equation promises that we'll obtain 8 moles of Cu for every 4 moles of Cu₂O.  That's a molar ratio of 8/4 or 2 (moles Cu/mole Cu₂O).

Therefore:  (0.070 moles of Cu₂O)*(2 moles Cu/mole Cu₂O) = 0.140 moles Cu.

(0.140 moles Cu)*(63.55 g/mole Cu) = 8.9 grams of copper

A lot of work for a little copper.  Next time, try MgO.  It would be fun to ignite it after the synthesis.

The kind of bond they will form is an ionic bond where one beryllium atom will donate electrons to two chlorine atoms (option A).

Ionic bond is a type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.

Ionic bonds are formed by atoms with opposite charges i.e. negative (-) and positive (+) charge. The metal is usually positively charged while the nonmetal is usually negatively charged.

According to this question, the molecule beryllium chloride has one beryllium atom, a metal, and two chlorine atoms, nonmetals. This means that an ionic bond will be formed by beryllium atom and chlorine atom.

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The Ksp for the equilibrium reaction HgBr₂(s) ⇄ Hg²⁺(aq) + 2Br⁻(aq) if HgBr₂ has a molar solubility of 2.50x10⁻⁷ M is 6.25x10⁻²⁰.

The given reaction is:

HgBr₂(s) ⇄ Hg²⁺(aq) + 2Br⁻(aq)   (1)

The equilibrium constant (Ksp) for the above reaction is given by:

\(Ksp = [Hg^{2+}][Br^{-}]^{2}\)   (2)  

At the equilibrium, we have (eq 1):

HgBr₂(s) ⇄ Hg²⁺(aq) + 2Br⁻(aq)  

                    s                2s  

Where:

s: is the molar solubility = 2.50x10⁻⁷ M  

By entering the values of molar solubility into equation (2) we can find the value of Ksp

\(Ksp = [Hg^{2+}][Br^{-}]^{2} = s(2s)^{2} = 4s^{3} = 4(2.50\cdot 10^{-7})^{3} = 6.25\cdot 10^{-20}\)

Therefore, the Ksp is 6.25x10⁻²⁰.

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I hope it helps you!  

According to the question the Mass of 8.47 g will form.

Mass is the measure of an object's resistance to acceleration when a net force is applied. It is measured in kilograms in the International System of Units (SI) or in grams in the centimetre-gram-second (CGS) system. Mass is related to weight, which is the measure of the force of gravity on an object. Mass is a measure of the amount of matter an object contains, regardless of its location in a gravitational field.

The reaction that will take place is:

\(Mg(NO_3)_2(aq) + Na_3PO_4(aq) → Mg_3(PO_4)2(s) + 3 NaNO_3(aq)\)

The number of moles of each reactant can be calculated using the following equation:

n (reactant) = C (concentration) x V (volume)

Moles of \(Mg(NO_3)_2\) = (0.200 M)(140.00 mL) = 0.028 moles

Moles of \(Na_3PO_4\) = (0.400 M)(181.00 mL) = 0.072 moles

Since the reaction is a 1:3 mole ratio, the limiting reactant is Mg(NO3)2 since it has the lesser amount of moles. Therefore, 0.028 moles of \(Mg_3(PO_4)_2\) will form.

The mass of \(Mg_3(PO_4)_2\) can be calculated using the following equation:

\(Mass = n (moles) \rightarrow M (molar mass)\\Mass of Mg_3(PO_4)_2 = (0.028 moles)(301.98 g/mol) = 8.47 g\)

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The mass ratio of magnesium in magnesium oxide (MgO) can be calculated by dividing the mass of magnesium (0.712 g) by the mass of magnesium oxide (1.18 g).

To find the mass ratio, we divide the mass of the element of interest (magnesium) by the mass of the compound (magnesium oxide). In this case, the mass of magnesium is given as 0.712 g and the mass of magnesium oxide is given as 1.18 g. So, the mass ratio of magnesium is calculated as follows:
Mass ratio = mass of magnesium / mass of magnesium oxide
= 0.712 g / 1.18 g
Calculating this gives us the mass ratio of 0.604.
Therefore, the mass ratio of magnesium in magnesium oxide is approximately 0.604.

The mass ratio of magnesium in magnesium oxide can be found by dividing the mass of magnesium by the mass of magnesium oxide. In this case, the mass of magnesium is given as 0.712 g and the mass of magnesium oxide is given as 1.18 g. By dividing these two values, we get a mass ratio of approximately 0.604. This means that for every gram of magnesium oxide, there are approximately 0.604 grams of magnesium. This mass ratio is useful in determining the composition of compounds and can be used in various chemical calculations.

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Answer:

Touch, or contact, thermometers must touch the body in order to measure temperature. Remote, or no-contact, thermometers can measure body temperature without touching the skin.

Explanation:

hope this helps

Answer:A

Explanation: Since more energy levels are added, the pull decreases which means the electronegativity from electrons also decrease.

The electronegativity change as principal energy levels are added to an atom is electronegativity decreases. The correct option is A.

The ability of an atom to draw shared electrons in a covalent connection is referred to as electronegativity. The stronger an element attracts the shared electrons, the higher its degree of electronegativity.

As a result, the electronegativity of an element drops as you advance down a group on the periodic table because the larger number of energy levels distances the outside electrons from the nucleus' pull. On the periodic table, electronegativity rises from left to right across each period.

Thus, the correct option is A. Electronegativity decreases regarding the electronegativity decreases with energy levels added.

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The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)

Significant figures can be defined as numbers in a group of numbers that place number in the right value or worth.

Significant figures defined the value of measurement of  a particular number.

The rules of engagement in this case is the set of rules or laid down principles that direct how we interact with this significant figures and how they are used.

For this case the significant figures of the product will be the same as the figure with the least significant figure in the multiplication.

In conclusion, The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)

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Answer:

Anatomy of the Immune System

.The immune system is a mobile, circulatingsystem. However, there are some fixed anatomical structures which are important to its function:

immune cells are made within the bone marrow during haematopoiesis

the thymus gland is situated just in front of the heart in the mediastinum. It is active throughout life, but is at its largest in childhood and decreases in size after puberty. It is where lymphocytes mature and receive their immunological “education” before being released into the bloodstream.

mature lymphocytes migrate to lymph nodes, which are small bean-like structures situated along the lymphatic vasculature throughout the body. These filter lymph and provide a site for antigen presentation to the adaptive immune system. Lymph is then returned to the systemic circulation via the thoracic duct, which joins with the left subclavian vein.

the spleen is basically a massive lymph node and is, therefore, another site of antigen presentation to mature lymphocytes. It is part of the reticulo-endothelial system which filters blood and removes old cells, tissue debris, pathogens and immune complexes. It also stores red blood cells and immature monocytes.

finally, the liver is also a site of antigen presentation and contains its own cohort of phagocytes and lymphocytes. This is a vital role, as the liver filters large volumes of potentially contaminated venous blood from the gastrointestinal (GI) tract. It also synthesises acute phase proteins such as CRP in response to infection.

Answer:  28.32 degrees Celsius

Explanation:

For this question, we can use the formula \(Q=mc \triangle T\), where \(Q\) is the amount of heat absorbed, \(m\) is the mass of the sample, \(c\) is the specific heat constant, and \(\triangle T\) is the change in temperature (final temperature minus initial temperature as stated in the question).

In this question, \(m=81.5, Q=1130\), and \(c=4.18\) (this is just the specific heat constant for water).

So, \(1130=(81.5)(4.18) \triangle T \longrightarrow \triangle T=3.32\)

This means that the temperature increased by 3.32 degrees Celsius, so the final temperature is 28.32 degrees Celsius

Answer:

may be mp3 player......

Answer:

mp3 player

Explanation:

Neon sign contains Neon

Flash camera contains Xenon

Helium balloon contains Helium

The major innovation of Bohr's model was the idea that energy levels are quantized.

This means that electrons can only exist in certain discrete energy levels around the nucleus of an atom. Bohr proposed that electrons orbit the nucleus in specific energy shells or orbits, and that each shell corresponds to a different energy level.

Electrons can move between these energy levels by absorbing or emitting photons of specific energy. This concept of quantized energy levels was a departure from the classical view of continuous energy and orbits proposed by Rutherford.

Bohr's model provided a better explanation for the stability of atoms and the emission and absorption spectra observed experimentally. It laid the foundation for the development of quantum mechanics, which further refined our understanding of atomic structure and behavior.

Overall, Bohr's model was a significant step in unraveling the mysteries of the atom.

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Answer:

able to evaporate

Explanation:

gas is evaporated liquid...... the process cannot take place again

This is a heterogeneous mixture because we can clearly see both the components separate from our naked eyes!

Answer:

the formula to calculate speed is d/t.

Answer:

 true.

Explanation: