When oxygen is available, sulfur dioxide is produced from the burning of sulfur. Which of the following word equations best represents this reaction? a. sulfur dioxide + oxygen sulfur dioxide b. sulfur + oxygen → sulfur dioxide c. sulfur dioxide → sulfur + oxygen d. sulfur → sulfur dioxide + oxygen

Answer:

C. Glass

Explanation:

Amorphous solids have a non-crystalline structure and no order. In that case, Diamonds, Graphite, and Iron all have a crystalline structure and order. You are left with C as your answer.

The amount represented by 25.0 g of oxalic acid (H₂C₂O₄) is approximately 0.201 mol. The number of molecules of oxalic acid in 25.0 g is approximately 1.21 × 10²³ molecules. The number of atoms of carbon in 25.0 g of oxalic acid is approximately 1.21 × 10²³ atoms.

1. To calculate the amount represented by 25.0 g of oxalic acid, we need to convert grams to moles. The molar mass of oxalic acid (H₂C₂O₄) is calculated as follows:

H: 1.01 g/mol × 2 = 2.02 g/mol

C: 12.01 g/mol × 2 = 24.02 g/mol

O: 16.00 g/mol × 4 = 64.00 g/mol

Total molar mass = 2.02 g/mol + 24.02 g/mol + 64.00 g/mol = 90.04 g/mol

Using the molar mass, we can calculate the amount in moles:

Amount (in moles) = mass / molar mass

Amount = 25.0 g / 90.04 g/mol ≈ 0.201 mol

2. To determine the number of molecules in 25.0 g of oxalic acid, we use Avogadro's number (6.022 × 10²³ molecules/mol):

Number of molecules = Amount (in moles) × Avogadro's number

Number of molecules = 0.201 mol × 6.022 × 10²³ molecules/mol ≈ 1.21 × 10²³ molecules

3. To find the number of atoms of carbon in 25.0 g of oxalic acid, we need to consider the molecular formula. In one molecule of oxalic acid, there are 2 carbon atoms (C₂). Therefore, the number of atoms of carbon is the same as the number of molecules:

Number of atoms of carbon = 1.21 × 10²³ atoms

In summary, 25.0 g of oxalic acid represents approximately 0.201 mol, contains approximately 1.21 × 10²³ molecules, and has approximately 1.21 × 10²³ atoms of carbon.

To know more about oxalic acid refer here:

https://brainly.com/question/32770055#

#SPJ11

The approximate pH at the equivalence point of a weak acid-strong base titration if 25 ml of aqueous hydrofluoric acid requires 30.00 ml of 0.400 m NaOH is 0.66.

We must first figure out how many moles of NaOH were supplied to achieve the equivalence point in a weak acid-strong base titration before we can determine the pH there.

Molarity times volume is 0.400 mol/L times 0.03000 L, or 0.0120 mol of NaOH.

NaOH and HF have a 1:1 stoichiometric ratio, therefore 0.0120 mol of HF is also how many moles were in the initial solution.

We can now calculate HF's Ka using the equilibrium formula for HF:

Ka = [HF][H+][F-]

All of the HF's reactions with the NaOH at the equivalence point have produced water and NaF.

The pH at the equivalency point is as a result:

pH is almost equal to -log[H+] = -log (0.220) = 0.66 (to two significant figures).

Learn more about Weak acid

https://brainly.com/question/22104949

#SPJ4

Answer:

6078

Explanation:

Answer:

B) 4.152 x 10^5

Explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.

Explanation:

tan(-300) = tan(-300+360) = tan (60)

here we added 360 degree. where by adding 360 +or- (n×360) to the any angle nothing will change as they called equivalent angles

equivalent angles is by adding +or- n×360 to any angle is equivalent to that angle so tan(-300) = tan(60) then we will calculate tan(60) on the calculator

Answer:

3

Explanation:

beacuses im right

The standard enthalpy change of the explosive reaction is -11408 kJ/mol.

The standard enthalpy change of the reaction can be calculated using the enthalpy of formation values of the reactants and products.

The enthalpy of the formation of ammonium nitrate (NH4NO3) is -393.5 kJ/mol, the enthalpy of the formation of the fuel oil (C10H22) is -249.7 kJ/mol, the enthalpy of the formation of oxygen (O2) is 0 kJ/mol.

The enthalpy of the formation of nitrogen (N2) is 0 kJ/mol, the enthalpy of the formation of water (H2O) is -285.8 kJ/mol, and the enthalpy of the formation of carbon dioxide (CO2) is -393.5 kJ/mol.

The equation for the explosive reaction is 3NH4NO3(s)+C10H22(l)+14O2(g)>3N2(g)+17H2O(g)+10CO2(g). Therefore, the standard enthalpy change of the reaction can be calculated using the following equation:

ΔH = [3(-393.5) + (-249.7) + (14*0) + (3*0) + (17*-285.8) + (10*-393.5)] - [3(-393.5) + (-249.7) + (14*0)]

ΔH = -11408 kJ/mol.

Therefore, the standard enthalpy change of the explosive reaction is -11408 kJ/mol.

For more questions like Enthalpy change click the link below:

https://brainly.com/question/29556033

#SPJ4

The complete question is attached below.

When Jocelyn fidgets throughout a lecture class, she is expending Calories via a mechanism known as non-exercise activity thermogenesis (NEAT). Option b.

NEAT refers to the energy expended during activities of daily living, such as fidgeting, standing, and walking. It is a way to burn calories without engaging in formal exercise. Therefore when Jocelyn fidgets throughout a lecture class, she is expending Calories via a mechanism known as non-exercise activity thermogenesis (NEAT). The correct answer is option b.

More on NEAT: https://brainly.com/question/9600011

#SPJ11

In locations one mile above sea level such as Denver, Colorado, the atmospheric pressure is less than 1 atm because the air is less dense. This means that it takes 95 °C thermal energy to get a liquid to boil in these locations

There are small molecule of air in the atmosphere and these molecules combine and form different layer in the atmosphere which create some kind of pressure and the pressure create by the air molecule layer is known to be the atmospheric pressure which is exerted by everything in the atmosphere and less pressure will decreases the temprature for water boiling point

Know more about liquid

https://brainly.com/question/20315127

#SPJ1

Answer:

2 moles NaClO3

Explanation:

2NaClO3 --> 2NaCl + 3O2

moles NaClO3 = 3 moles O2 x (2 moles NaClO3/3 moles O2) = 2 moles

conversion factor: 2 moles NaClO3 = 3 moles O2

In order to produce 3 moles of \(O_{2}\), the chemical reaction needs to be balanced. the required number of moles of \(NaClO_{3}\) are 2.

When the reactants undergo a chemical reaction, the number of moles on both the reactant and the product side must be balanced.

The chemical reaction of \(NaClO_{3}\) is

2 \(NaClO_{3}\)⇄2NaCl  + 3 \(O_{2}\)

On the left side, 2 moles of \(NaClO_{3}\) breaks into 2 moles of NaCL and 3 moles of \(O_{2}\). on the right side. Therefore, both side have an equal number of moles of each element.

Hence, two moles of \(NaClO_{3}\) is required to produce 3 moles of \(O_{2}\).

Learn more about a balanced chemical reaction.

https://brainly.com/question/22817140

#SPJ2

Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

The n = 5 to n = 3 transition in the bohr hydrogen atom corresponds to the emission of a photon with a wavelength of 1280 nm.

Because it does not account for forces owing to inter-electronic attractions, Bohr's atomic model is only valid for single electron species.

The Bohr Model of the Hydrogen Atom presented the planetary model initially, but an assumption about electrons was subsequently established. The premise was that the structure of atoms could be quantized. Bohr hypothesised that electrons orbited the nucleus in fixed-radius orbits or shells.

Electrons orbit the nucleus in fixed-size, fixed-energy orbits. The orbit's energy is proportional to its size. The smallest orbit has the lowest energy. When an electron travels from one orbit to another, it absorbs or emits radiation.

learn more about Bohr Model refer

https://brainly.com/question/18002213

#SPJ4

The reaction of Mg and oxygen (in the air, we have oxygen) is the following:

If we use carbon dioxide (CO2) to react with magnesium oxide (MgO), we can see that this compound would continue to burn. This is because the reactivity series of Mg is above the reactivity of carbon and this compound can take the oxygen from carbon dioxide to react.

The expected blood gas values for this patient at the time of admission of patient is option E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

A 20-year-old woman presents to the Emergency Department with persistent symptoms of palpitations, dizziness, sweating, and paresthesia. She has a history suggestive of an anxiety disorder.

To assess her condition, blood gases and electrolytes are ordered, and a positron emission tomography (PET) scan is performed. The PET scan reveals increased perfusion in the anterior portion of each temporal lobe. Based on these findings, the doctor prescribes a benzodiazepine medication.

The expected blood gas values at the time of admission can be determined by analyzing the given options:

A. pH 7.51; PaCO₂ = 49 mm Hg; [HCO₃]⁻ = 38 mEq/L; Anion Gap = 12 mEq/L

B. pH 7.44; PaCO₂ = 25 mm Hg; [HCO₃]⁻ = 16 mEq/L; Anion Gap = 12 mEq/L

C. pH 7.28; PaCO₂ = 60 mm Hg; [HCO₃]⁻ = 26 mEq/L; Anion Gap = 12 mEq/L

D. pH 7.28; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 16 mEq/L; Anion Gap = 25 mEq/L

E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

By evaluating the options, the most appropriate choice is:

E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

This option presents a higher pH (alkalosis) and a decreased PaCO₂ (respiratory alkalosis), which could be consistent with the patient's symptoms of hyperventilation due to anxiety. The [HCO₃]⁻ level within the normal range and a normal anion gap further support this interpretation.

In summary, the expected blood gas values for this patient at the time of admission are a higher pH, decreased PaCO₂, normal [HCO₃]⁻, and a normal anion gap, indicative of respiratory alkalosis likely caused by hyperventilation related to her anxiety disorder.

To know more about Blood gas values here: https://brainly.com/question/27826544

#SPJ11

They affect food webs through energy production and agriculture, pollution, habitat destruction, over fishing and hunting.

All the food networks in a single ecosystem make up a food web. Each organism in an ecosystem is a link in a number of food chains. Energy and nutrients can go along different food chains as they move through the ecosystem.

Who eats whom in the wild is described by the food chain. Everything that is alive, from microscopic algae to enormous blue whales, depends on food to thrive. Each food web represents a possible route for nutrients and energy to travel through the ecosystem.

The majority of consumers are people. Energy production, agriculture, pollution, habitat degradation, overfishing, and hunting all have an impact on food webs. Along with population increase, their needs for food and shelter also have an impact on the ecosystems of the land and the sea.

To know more about food web visit:

https://brainly.com/question/18816028

#SPJ1

The answer is already given which is in the carbon cycle methanotrophs consume methane that are produced by other species.

Prokaryotes known as methanotrophs use methane as a source of carbon and chemical energy. They can develop aerobically or anaerobically, are bacteria or archaea, and need single-carbon molecules to thrive.

Despite the fact that some methanotrophs can oxidize atmospheric methane, methanotrophs are most prevalent in or close to areas where methane is produced. Among their habitats are marshes, soils, and wetlands. Given their significant contribution to the global methane budget, they are of particular interest to scientists researching global warming.

The particular instance of methylotrophy known as methylnotrophy involves the use of single-carbon molecules that are more reduced than carbon dioxide. Methylocella silvestris and Methylocapsa aurea are the only facultative methanotrophs known to date.

To know more about methylnotrophy visit

https://brainly.com/question/28386007

#SPJ4

Answer:

liquid  B

Explanation:

because B has a lower bp it needs less time and energy to turn into vapour and is collected into the condenser first

250 kJ of energy are removed from a 4.00 x 10^2 g sample of water at 60°C. Will the sample of water completely freeze?When the heat flows out of the water sample, its temperature reduces. It means, the heat lost from water must be enough to decrease the temperature to the freezing point. At freezing point, the water starts to freeze, and the energy will not be used to lower the temperature anymore.

The specific heat capacity of water is 4.184 J/g °C and the molar heat of fusion of water is 6.01 kJ/mol.Using this information, we can determine whether the sample of water will completely freeze or not.Q = mCΔT + nΔHfwhere, Q = amount of energy lostm = mass of waterC = specific heat capacityΔT = change in temperature n = number of moles of waterΔHf = molar heat of fusionWe have mass, m = 4.00 x 10^2 g and ΔT = -60°C (negative sign because heat energy is lost)C = 4.184 J/g °Cn = mass/molar mass of water= 4.00 x 10^2 g/ 18.015 g/mol= 22.20 moles (approx)ΔHf = 6.01 kJ/molSubstituting these values, we get,250000 J = 4.00 x 10^2 g × 4.184 J/g °C × (-60°C) + 22.20 moles × 6.01 kJ/molThe above equation shows that the heat lost is not enough to completely freeze the water.

The water will only cool down to 0°C. Thus, it will not completely freeze. The heat energy needed to freeze the water completely is (m × ΔHf) = 4.00 x 10^2 g × 6.01 kJ/mol = 24.05 kJ. The lost energy is only 250 kJ. Hence, the sample of water will not completely freeze.

To know more about freezing visit:-

https://brainly.com/question/14131507

#SPJ11

Answer:

2.71*10^24  formula units in 4.5 moles NaCl

Explanation:

Remark

Make sure you know what a formula unit it. In this case, what it consists of is 1 ion of Na+ Combined with 1 ion of Cl- Together they combine to make NaCl which is ordinary table salt.

1 mole contains 6.02 * 10 ^23 formula units of any chemical -- in this case NaCl.

Therefore 4.50 moles have 4.5 * 6.02*10^23 formula units.

Answer:2.71*10^24

Answer:

A big load of icecream/ loaded cake.

Explanation:

Because neurons are full of proteins that tend to be negatively charged, they tend to attract positively charged ions.

The interior of neurons is filled with a variety of proteins that have a negative charge. This negatively charged environment tends to attract positively charged ions, such as sodium (Na+) and potassium (K+) ions. The movement of these ions across the cell membrane and into the interior of the neuron is an important aspect of neuronal signaling and communication.

In neurons, the movement of positively charged ions is regulated by ion channels and pumps, which control the flow of ions in and out of the cell. This regulation is critical for maintaining the resting potential of the neuron and for transmitting signals along the length of the neuron. For example, when an electrical signal reaches the end of a neuron, the ion channels there open, allowing positively charged ions to flow into the cell. This creates a change in the electrical potential of the neuron that triggers the release of neurotransmitters, which can then activate other neurons or target cells.

In summary, the negatively charged environment inside neurons attracts positively charged ions, which play a crucial role in neuronal signaling and communication.

Learn more about neurons here:

https://brainly.com/question/29368083

#SPJ4

Answer:

Every Chlorine atom has an atomic mass of 35.45u and 17 protons and electrons.

Explanation:

this can all be figured out looking at the atomic number in the top left corner and the mass is found at the bottom.

Answer

a) Ba

b) Si

c) Zn

Explanation

The presence of unpaired electrons in an atom orbitals indicates paramagnetic properties. When no unpaired electron is observed in an atom orbitals, such an atom possesses diamagnetic properties.

Therefore, atoms in their ground states that are expected to be diamagnetic in the options are:

a) Ba

b) Si

c) Zn

A PH of 5 or less. Fish are injured not just by the acidity of a lake, but also by pollutants that drain out of the land and into the water. When the environment is acidic, aluminium is the poisonous material that leaches.

Copper, aluminium, and other heavy metals can be dissolved into runoff and drinking water as a result of acid rain. By increasing the amount of dangerous substances in the water and soil, this process also lowers the populations of species in the aforementioned waterbody or soil.

When fossil fuels like coal are used to create electricity, power plants generate the bulk of sulphur dioxide and most of the nitrogen oxides. Nitrogen oxides and sulphur are also released by the exhaust of vehicles, lorries, and buses.

Learn more about acidity visit: brainly.com/question/29323762

#SPJ4

An old sandwich going bad in the garbage and baking an apple pie are two examples of chemical reactions, which they both share.

Baking soda and vinegar producing carbon dioxide, iron rusting, and wood burning are a few examples of chemical changes. The metabolization of food and the production of amylase from the combining of sugar and saliva are only two examples of the many chemical processes that the body produces.

A chemical change occurs when the molecules that make up two or more compounds are rearrange to form a new substance. When you bake, you start with a range of ingredients.

To know more about chemical reactions visit:-

https://brainly.com/question/29039149

#SPJ1

Answer:

Applied

Explanation:

Since Brent is using his existing scientific knowledge to create a new product or invention then this falls under the category of Applied Research. Applied research includes using any theoretical or proven information in order to create something physical that can be used in our real-life world. Usually, this research focuses on solving a problem through the use of technology. Thisis exactly what Brent is trying to do by creating a new plastic that does not have harmful chemicals that can hurt babies in the long term.

Answer:applied

Explanation:

Answer:

B. Cells are only created from other cells

Explanation:

Cells make a copy of themselves and then theres another cell just like the last, kinda like copy and paste

Answer:

homogeneous mixture