the hydrogens and oxygen of a water molecule are held together by bonds. select all that apply.

Answer:

The answer is “They supported the use of radioactive elements for medical diagnostic purposes”.

Answer:

They supported the use of radioactive elements for medical diagnostic purposes.

Explanation:

(Its a recorded fact)

Approximately 4 L of C₂H₂ are required to produce 8 L of CO₂ assuming the reaction is at STP.

To solve for the amount of C₂H₂ needed, we can use the stoichiometry of the balanced equation, combustion of hydrocarbons and the ideal gas law. According to the balanced equation, 2 moles of C₂H₂ react to produce 4 moles of CO₂. Therefore, we can set up the following ratio by assumimg x moles of C₂H₂ and then solving for x,

x = (2/4) * (8 L CO₂)

= 4 L C₂H₂

Since the problem states that the reaction is at STP (standard temperature and pressure), we can assume that the volume of gas is directly proportional to the number of moles of gas.

V = nRT/P

Solving for n at STP,

n = PV/RT = (4 L) x (1 atm) / (0.0821 L·atm/mol·K x 273.15 K) ≈ 0.167 mol

Therefore, approximately 0.167 mol (or 4 L) of C₂H₂ is required to produce 8 L of CO₂ assuming the reaction is at STP.

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Answer: During succession, new species move into an area and colonize it.

Explanation: Ecological succession refers to the process of change in the composition and structure of an ecosystem over time. It occurs due to the interactions between the biotic (living) and abiotic (non-living) components of an environment. As succession progresses, new species gradually establish and thrive in the area, leading to a change in the species composition. This process can occur over a long period of time, ranging from decades to centuries, depending on various factors such as environmental conditions and the specific type of succession.

Answer:

Products have less potential energy than reactants.

Explanation:

Let's remember the concept of an exothermic reaction: a chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.

Now, let's see how looks a potential energy diagram for an exothermic reaction:

This represents that the products have less potential energy than reactants.

The sentence which is appropriate for a formal lab report in CHM113 lab is that three more trials were conducted and the data was recorded which is therefore denoted as option A.

This refers to a type of facility that provides controlled conditions in which scientific or technological research and experiments are performed by scientists etc.

The laboratory involves taking various measurements and data which are then analyzed so as to arrive at an accurate and logical conclusion about the experiment or research work being done.

Three more trials were conducted and the data was recorded is the appropriate sentence which is used because in lab report procedure as it involves collection of data under various types of conditions.

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Answer:

the periodic table

Explanation:

Elements with similar properties are in columns called groups. Elements to the left of this line are metals. Elements in the same group of the periodic table have the same number of electrons in their outer shell. This gives them similar chemical properties.

Hope this helps!

The empirical formula of the oxide would be \(BiO_3\).

The empirical formula of a compound is the chemical formula showing the component atoms of the compound in their simplest, whole-number ratio.

The compound in question contains bismuth and oxygen.

Mass of bismuth + oxygen = 10.28 g

Mass of bismuth = 8.3 g

Mass of oxygen = mass of bismuth + oxygen - mass of bismuth

                          = 10.28 - 8.3 = 1.98 grams

Moles of each atom:

Bismuth = 8.3/209 = 0.04 mol

Oxygen = 1.98/16 = 0.12 mol

Divide by the smallest mole:

Bismuth = 0.04/0.04 = 1

Oxygen = 0.12/0.04 = 3

Thus, the empirical formula of the oxide is \(BiO_3\).

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Find the empirical formula of the oxide when 10.28 g bismuth oxide contains 8.3 g bismuth.

Answer:

Animals

I took the test

:))

Radiocarbon dating is used to determine the age of an object.

Radiocarbon dating is a method used to estimate the age of organic materials based on the decay of radioactive carbon-14 isotopes. This technique is widely employed in archaeology, geology, and other scientific fields. When living organisms, such as plants or animals, are alive, they maintain a ratio of carbon-14 to stable carbon-12 isotopes.

However, once they die, the carbon-14 begins to decay at a known rate. By measuring the remaining carbon-14 and comparing it to the initial ratio, scientists can calculate the time that has passed since the organism's death. This method is particularly useful for dating objects that are up to around 50,000 years old. Palynology is the study of pollen grains, taphonomy focuses on the process of decay and fossilization, and paleontology deals with the study of fossils but not specifically dating methods.

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To promote the precipitation of calcium fluoride (\(CaF_{2}\)) from its aqueous ions, you would typically add a compound that can react with the dissolved ions and form a less soluble product. In this case, you could add a source of fluoride ions (\(F^{-}\)) to the solution, which would react with the calcium ions (\(Ca^{2+}\)) present to form calcium fluoride.

By adding a fluoride-containing compound, such as sodium fluoride (NaF) or hydrofluoric acid (HF), the equilibrium would shift towards the precipitation of calcium fluoride according to Le Chatelier's principle.

The increased concentration of fluoride ions would drive the reaction forward by consuming the calcium ions, resulting in the formation of solid calcium fluoride.

It is worth noting that the solubility of calcium fluoride is relatively low, so even without the addition of fluoride ions, some precipitation may occur. However, the presence of fluoride ions would significantly enhance the precipitation process.

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The simplest and the most common monosaccharide is a six-carbon sugar called glucose.

Glucose is a kind of sugar found in food, and it serves as an energy source for the body. Blood glucose or blood sugar is glucose or sugar that circulates in the blood to the body's cells. Glucose is a simple sugar that can be represented chemically as C₆H₁₂O₆. Glucose is the monosaccharide that occurs the most frequently overall, which is a subgroup of carbohydrates.

During the process of photosynthesis, plants and the majority of algae produce glucose from water and carbon dioxide by utilizing the energy from sunlight. Glucose is then used to produce cellulose in the cell walls of plants, which is the most abundant form of carbohydrate on the planet.

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Sorry this question is incomplete.

Gabriel Synthesis achieve alkyl halide to primary amine conversion.

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Explanation:

I think the answer is B ‍♂️ but I'm not sure

The given compound, (2S, 3R)-2-bromo-3-chlorobutane, has two chirality centers. This means that it has four possible stereoisomers, with each isomer having a different spatial arrangement of atoms around the two chirality centers.

The stereochemistry of a molecule is described using the R/S system, where R stands for rectus (Latin for right) and S stands for sinister (Latin for left). To determine the R or S configuration at each chirality center, we need to assign priorities to the four substituent groups based on atomic number. The group with the highest atomic number gets the highest priority, followed by the group with the next highest atomic number, and so on. If two or more groups have the same priority, we look at the next set of atoms until we find a point of difference.

In this compound, the bromine atom has the highest priority at the first chirality center, while the chlorine atom has the highest priority at the second chirality center. Once we have assigned priorities to all four substituent groups, we can determine the configuration at each center by visualizing the molecule with the lowest priority group (in this case, a methyl group) pointing away from us. If the three remaining groups are arranged in a clockwise direction, the configuration is labeled R, and if they are arranged counterclockwise, the configuration is labeled S.

Therefore, the four possible stereoisomers of (2S, 3R)-2-bromo-3-chlorobutane are (2S, 3R), (2S, 3S), (2R, 3R), and (2R, 3S). Each of these isomers has a unique three-dimensional structure and physical properties, despite having the same chemical formula.

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Answer:

²³⁵₉₂U

Explanation:

The right symbol for the nuclei is ²³⁵₉₂U;

 For this chemical element, the atom is represented by the symbol U;

 To the superscript before the symbol is the mass number

 The subscript before the symbol is the atomic number

Mass number is the number of protons and neutrons

Atomic number is the number of protons.

:

Select the correct answer. Which statement is always true about a reversible chemical reaction? A. The concentration of reactants is higher than that of the products. B. The products can form reactants, and the reactants can form products. C. The concentrations of reactants and products are not constant. D. The concentration of the products is higher than that of the reactants.

Answer:

number B.

Answer:

Plato / Edmentum  -  B

Explanation:

Answer:

Explanation:

Answer:

You have 1680 grams of urea. It means (in it) there are 787 grams of nitrogen, 112 grams of hydrogen, 336 grams of carbon, and 448 grams of oxygen.

Explanation:

Answer:

1.2 moles

Explanation:

this is the balanced equation for the reaction of oxygen (O2) and hydrogen (H2), usually we don't write the 1 in front of O2

2H₂ + 10₂ → 2H₂O

the molar ratio of hydrogen to oxygen is 2 : 1

we are trying to react with 2.4 mol of H2 so the moles of O2 is half the number of moles of H2 = 2.4 ÷ 2 = 1.2 mol

another way to think of it:

2H₂ + 10₂

2 : 1

2.4 mol : x mol

to get from 2 to 2.4 multiply by 1.2, so do the same to the other side

1 × 1.2 = 1.2 mol

Answer:

Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.

Answer:

combustion is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.

In the case of KCl and CaO, CaO has a stronger ionic bond due to the greater electronegativity difference, resulting in a higher melting point.

Both KCl and CaO have ionic bonds, which occur when a metal donates electrons to a nonmetal to form a stable compound. The strength of the bond is determined by the difference in electronegativity between the two elements. The greater the difference, the stronger the bond, and the higher the melting point.

In the case of KCl, potassium (K) has a lower electronegativity than chlorine (Cl), which means it donates its valence electron to chlorine, forming a positive K+ ion and a negative Cl- ion. This creates a strong ionic bond between the two ions. However, CaO has a greater electronegativity difference between calcium (Ca) and oxygen (O), resulting in an even stronger ionic bond between the two ions.

Therefore, CaO has a higher melting point than KCl due to the stronger ionic bond between its ions. This means that more energy is required to break the bonds holding the ions together, causing CaO to have a higher melting point.

In conclusion, the melting point of ionic compounds is determined by the strength of their bonds, which is based on the electronegativity difference between the two elements forming the compound.

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The volume of carbon dioxide produced, when 32 g of methane burn completely in oxygen at room temperature and pressure, is approximately 49.6 dm³.

After balancing  chemical reaction for methane combustion, the  equation becomes

CH₄ + 2O₂ → CO₂ + 2H₂O

This equation shows that for every one mole of methane that reacts, one mole of carbon dioxide is produced.

First, we need to determine the number of moles of methane in 32 g of the compound.

Methane's molar mass is 16.04 g/mol, therefore:

32 g / 16.04 g/mol = 1.995 mol

This means that 1.995 mol of methane will react with oxygen to produce 1.995 mol of carbon dioxide.

Next, we can use the ideal gas law to calculate the volume of carbon dioxide

produced. At room temperature and pressure (which is typically taken to be 25°C and 1 atm), the ideal gas law can be written as:

PV = n*R*T

Where, pressure= P, V= volume, n= number of moles, R= gas constant, T= temperature.

Since we know that 1.995 mol of carbon dioxide is produced, we can plug in the values for n and T (in Kelvin, so T = 298 K) and solve for V:

V = (n*R*T)/P

= ((1.995 mol)*(0.0821 L•atm/mol•K)*(298 K))/(1 atm) ≈ 49.6 L

However, the question asks for the volume in dm3, which is the same as  liters.

Therefore, the volume of carbon dioxide produced is approximately 49.6 dm³.

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