Liquid alcohol will change to vapor when its temperature reaches the

We know that Fe2O3 has a molar mass of 159.69 g / mol, therefore the number of moles of a 12 g sample is:

number of moles = 12 g / (159.69 g / mol)

number of moles = 0.075 mol

The element is identified exclusively by its number of protons. Atomic and mass numbers are included in isotopic notation. Oxygen isotope has an atomic number of 8 protons, 8 electrons, and 9 neutrons.

A chemical element's isotope is any of two or more species of atoms that share the same atomic number, position in the periodic table, and virtually identical chemical behavior.

But differ in atomic mass and physical characteristics. There are one or more isotopes for each chemical element.

Isotopes are forms of an element that have the same number of protons and electrons, but differing numbers of neutrons.

The many isotopes of an element have varying weights depending on how many neutrons there are in each one.

Therefore, Atomic and mass numbers are included in isotopic notation.

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If the pattern of ions in Galena is expanded, each lead ion would be surrounded by six sulfide ions, and each sulfide ion would be surrounded by six lead ions.

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The empirical formula of the compound is NH₂, indicating one mole of nitrogen and two moles of hydrogen in the simplest whole number ratio.

Determining the empirical formula:

1. Set up the equations:

Let x be the mass of nitrogen (N) in the compound.

Let y be the mass of hydrogen (H) in the compound.

We know the total mass of the compound is 3.42 g: x + y = 3.42 g (Equation 1).

2. Balance the combustion reactions:

The combustion of nitrogen forms nitrogen dioxide (NO₂): N + O₂ → NO₂.

The combustion of hydrogen forms water (H₂O): 2 H + 1/2 O₂ → H₂O.

3. Use the combustion reactions to calculate the mass of nitrogen:

From the first combustion reaction, we can relate the mass of NO₂ to the mass of N:

9.82 g NO₂ * (1 mol NO₂ / 46 g NO₂) * (1 mol N / 1 mol NO₂) * (14 g N / mol) = x

This simplifies to x = 2.989 g N.

4. Calculate the mass of hydrogen:

Subtract the mass of nitrogen from the total mass to find the mass of hydrogen: y = 3.42 g - 2.989 g = 0.4313 g H.

5. Convert mass to moles:

Divide the mass of each element by its atomic mass to get the number of moles:

N: 2.989 g / 14 g/mol = 0.2135 mol

H: 0.4313 g / 1 g/mol = 0.4313 mol

6. Find the simplest whole number ratio of moles:

Divide both the number of moles by the smallest number of moles (0.2135 mol for nitrogen in this case):

N: 0.2135 mol / 0.2135 mol = 1

H: 0.4313 mol / 0.2135 mol ≈ 2

7. Write the empirical formula:

Based on the whole number ratio of moles, the empirical formula is NH₂.

Final answer:

The combustion analysis of a nitrogen and hydrogen compound resulted in 9.82g of NO₂ and 3.85g of H₂O, leading to the calculation of moles of N and H and determination of the empirical formula as NH₂.

Explanation:

To determine the empirical formula of the compound containing only nitrogen and hydrogen from the combustion results, we will follow a step-by-step process:

First, we convert the mass of NO₂ and H₂O to moles:

Next, we use the moles of NO₂ to find moles of N (one N atom per molecule of NO₂) and the moles of H₂O to find moles of H (two H atoms per molecule of H₂O):

Finally, we compare the mole ratio of H to N, which gives roughly 2:1 ratio, indicating that the empirical formula of the compound is NH₂.

Answer:

Continental drift was a theory that explained how continents shift position on Earth's surface. Set forth in 1912 by Alfred Wegener, a geophysicist and meteorologist, continental drift also explained why look-alike animal and plant fossils, and similar rock formations, are found on different continents.

Explanation:

Answer:

None of them. The correct name of the covalent compound is Boron Trifluoride.

Explanation:

BF3 - due to there being 1 Boron atom and three fluorine atoms, we will name:

B - Boron

F3 - because there is three fluorine, we will put the tri- prefix in front of Fluorine and change the ending to -ide.

With that, you get Boron Trifluoride.

Answer:

Mass is still conserved even if it is melted or dissolved it is still conserved during and after the transformation.

Explanation:

I only have the answer to the first one. I did this on my school platform and still got it right.

There are 1.98 moles of MgSiO₃ in 199 g of the compound, so one needs to use the molar mass of MgSiO₃, which is the sum of the atomic masses of its constituent elements.

The atomic mass of Mg is 24.31 g/mol, the atomic mass of Si is 28.09 g/mol, and the atomic mass of O is 16.00 g/mol. Therefore, the molar mass of MgSiO₃ is:

molar mass of MgSiO₃ = (1 x atomic mass of Mg) + (1 x atomic mass of Si) + (3 x atomic mass of O)

molar mass of MgSiO₃ = (1 x 24.31 g/mol) + (1 x 28.09 g/mol) + (3 x 16.00 g/mol)

molar mass of MgSiO3 = 100.39 g/mol

moles = mass/molar mass

To calculate the number of moles of MgSiO₃ in 199 g of the compound:

moles of MgSiO₃ = 199 g / 100.39 g/mol

moles of MgSiO₃ = 1.98 mol

Hence, there are 1.98 moles of MgSiO₃ in 199 g of the compound, so one needs to use the molar mass of MgSiO₃, which is the sum of the atomic masses of its constituent elements.

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Final answer:

Seed plants and ferns are both vascular plants with a dominant sporophyte generation and a system of vascular tissues. Ferns are advanced seedless vascular plants with fronds, while seed plants include gymnosperms and angiosperms that bear seeds, with angiosperms also producing flowers.

Explanation:

Seed plants and ferns share several common features as they are both types of vascular plants. Firstly, both have a system of vascular tissues that conduct water and nutrients throughout the plant. This includes the xylem, which carries water, and the phloem, which distributes sugars and other organic compounds. Additionally, both seed plants and ferns exhibit a life cycle with a dominant sporophyte generation, meaning the diploid stage is the more noticeable and long-lived phase. While ferns reproduce through spores and do not produce seeds or flowers, the two groups share an evolutionary background, with ferns representing an important precursor in the evolution of seed plants.

Ferns are distinguished by their large, divided leaves known as fronds, which develop from fiddleheads, and they tend to thrive in moist and shaded environments. Ferns, which emerged during the Devonian period, are some of the most advanced seedless vascular plants. They also have roots and small structures called sori on the underside of the fronds where sporangia are contained. In contrast, seed plants encompass gymnosperms and angiosperms, which bear seeds and in the case of angiosperms, flowers as well. The presence of seeds in seed plants and spores in ferns is a critical difference between the two groups but does not overshadow their vascular plant commonalities.

Chloroplasts produce energy via photosynthesis in plant cells, while mitochondria fulfill this role in both plant and animal cells. The correct answer is chloroplast.

In both plant and animal cells, the mitochondria are the organelles responsible for producing energy. They convert nutrients and oxygen into adenosine triphosphate (ATP), which is used as a source of chemical energy for cellular processes. However, plants have an additional organelle for energy production: the chloroplast. Chloroplasts capture light energy and use it to convert carbon dioxide and water into glucose and oxygen through the process of photosynthesis. This glucose can then be used by the plant cell for energy or stored for later use.

In the context of the question, while mitochondria are the primary energy-providing organelles in all eukaryotic cells, the question specifies in the context of a quiz on plant and animal cells. Since chloroplasts are unique to plant cells and are essential for photosynthesis, the correct answer in this context is chloroplast, as it is the organelle that provides energy through photosynthesis in plant cells. Mitochondria would still be correct for animal cells or as a more general answer for eukaryotic cells, but the specific answer provided here is chloroplast, which is unique to plant cells.

Final answer:

The osmotic pressure of a solution containing 24.6g of glycerin in 250ml of solution at 298K is calculated using the formula for osmotic pressure and found to be 26.2 atm.

Explanation:

To calculate the osmotic pressure of a solution containing 24.6g of glycerin (C₃H₅(OH)₃) at 298K, we first need to find the molarity of the solution. Given that the molar mass of glycerin is approximately 92.09 g/mol, the moles of glycerin can be calculated as:

Moles of glycerin = 24.6 g / 92.09 g/mol = 0.267 moles

Since the solution volume is 250 mL, or 0.25 L, the molarity (M) of the solution is:

M = Moles of solute / Volume of solution (L) = 0.267 moles / 0.25 L = 1.068 M

The formula to calculate osmotic pressure (Π) is Π = iMRT, where:

i is the van't Hoff factor (For glycerin, i = 1 because it doesn’t dissociate in solution).

M is the molarity of the solution.

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

T is the temperature in Kelvin.

Substituting the values into the formula gives:

Π = (1)(1.068 M)(0.0821 L.atm/mol.K)(298 K) = 26.2 atm

Therefore, the osmotic pressure of the solution is 26.2 atm.

Answer:

Ionic compounds have high melting and boiling points due to their strong ionic bonding. This is due to the strong electrostatic interactions between positive and negative ions. That's why a large amount of energy is needed to break the bonding between ions.

Explanation:

My chosen 'science gizmo' invention would be a time machine, using gravity as a conduit to traverse through different periods of time as suggested in general relativity theories.

If I had to invent a 'science gizmo,' it would be a time machine influenced by the theories of gravity and time machines as presented in the field of general relativity. A time machine is a concept often seen in science fiction, which manipulates gravity to allow movement through time at a pace or direction different from our current linear understanding. Though only theoretical, the potential to explore different periods of time or leap into the future offers exciting possibilities.

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