Which of the following best describes an object that is accelerating? *

(A) A hockey puck slows down as it hits the net.
(B) A bird travels 100 km to the northeast.
(C) A soccer ball travels at 3 m/s.
(D) A basketball sits motionless on the gymnasium floor.

The mass of water that can be made would be 36.03 grams.

From the balanced chemical equation:

1 mole N2H4 produces 4 moles H2O2

0.750 mole N2H4 will produce = 0.750 x 4/1 = 3.000 moles H2O2 (limiting reactant)

0.500 mole H2O2 is used, which is less than the amount produced by N2H4, so it is also a limiting reactant.

Now, we can use the mole ratio between H2O2 and H2O to calculate the moles of water produced:

1 mole H2O2 produces 4 moles H2O

0.500 mole H2O2 will produce = 0.500 x 4/1 = 2.000 moles H2O (limiting reactant)

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

2.000 moles H2O x 18.015 g/mol = 36.03 g H2O

Therefore, 36.03 grams of water can be made from the given amounts of N2H4 and H2O2.

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The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.

What is a micropipette?

A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.

Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.

Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.

It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.

Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.

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Answer:

I'm pretty sure its stimulus

Answer:

479 grams

Explanation:

5.43 times the molar mass of CaSO4 would give us the answer.

(5.43) * (40.078 + 32.066 + 15.9994) = 478.618662 grams

Significant figures is 3, meaning we need to round it into 3 places, giving us 479 grams.

When a certain main group element reacts with an excess of magnesium at room temperature, it forms magnesium diatomic cations and a compound known as magnesium di-element (MgE2).

When a certain main group element reacts with an excess of magnesium at room temperature, the reaction results in the formation of magnesium diatomic cations and a compound called magnesium di-element, denoted as MgE2.

In this reaction, magnesium (Mg) in its solid state (s) undergoes oxidation, losing two electrons (e-) to form magnesium diatomic cations (Mg2+). The main group element (denoted as E) reacts with these magnesium cations to form the compound MgE2, which is a solid (s) product.

To better understand the reaction, let's consider an example with E being sulfur (S). When sulfur reacts with an excess of magnesium, the reaction equation is as follows:

Mg(s) + S(g) → MgS2(s)

In this case, magnesium loses two electrons to become Mg2+ ions, while sulfur accepts these electrons to form S2- ions. The positively charged magnesium ions and negatively charged sulfur ions attract each other, resulting in the formation of the solid compound magnesium disulfide (MgS2).

In conclusion, when a certain main group element reacts with an excess of magnesium at room temperature, it forms magnesium diatomic cations and a compound known as magnesium di-element (MgE2). The specific product will depend on the identity of the main group element.

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The standard temperature and pressure conditions enthalpy is usually measured under are 1kPa and 273K (option A).

Enthalpy in thermodynamics is a measure of the heat content of a chemical or physical system.

Enthalpy is the sum of the internal energy and pressure times volume It can be calculated using the following formula:

H = E + P V

Where;

H = Enthalpy

E = internal energy

P = pressure

V = volume

However, the enthalpy of a substance is usually measured under standard temperature and pressure.

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Answer: To determine how many grams of hydrazine are needed to produce 96.0 grams of water, we can use the mole ratio between hydrazine and water in the chemical equation.

First, we need to convert the number of grams of water to moles. We can do this using the molar mass of water, which is 18.0 grams/mole:

96.0 g H2O / 18.0 g/mol = 5.33 moles H2O

Next, we can use the mole ratio between hydrazine and water in the chemical equation to determine the number of moles of hydrazine that would be needed to produce 5.33 moles of water:

1 mole N2H4 / 2 moles H2O = 0.5 mole N2H4

Finally, we can use the molar mass of hydrazine (32.0 grams/mole) to convert the number of moles of hydrazine to grams:

0.5 mole N2H4 * 32.0 g/mol = 16.0 grams N2H4

Therefore, 16.0 grams of hydrazine are needed to produce 96.0 grams of water.

Size-exclusion chromatography (SEC) is a suitable chromatographic method for isolating pure a and b chains.

SEC is a technique that separates molecules based on their size. In this case, the a and b chains can be separated from other components based on their molecular weight. SEC columns have porous beads that allow smaller molecules to enter and travel through the beads, while larger molecules are excluded and elute first. By choosing an appropriate SEC column, the a and b chains, which typically have different molecular weights than other components, can be isolated and collected separately. This method ensures the purity of the isolated a and b chains.

Size-exclusion chromatography (SEC) is a useful chromatographic method for isolating pure a and b chains. The technique separates molecules based on their size, and by utilizing a suitable SEC column, the a and b chains can be separated from other components due to their distinct molecular weights. This approach guarantees the purity of the isolated a and b chains, making it an effective method for their isolation.

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The ph of an aqueous solution that contain 2.50 × 10⁻⁴m hydronium ion is 3.60

To measure the ph we have

pH = -log (H₃O⁺)

     = -log (2.5 × 10⁻⁴ )

     = 3.60

Hence the ph of the aqueous solution is 3.60

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The periodic table is organized into groups (vertical columns) and periods (horizontal rows). Elements in the same group are more likely to undergo the same kinds of reactions.

Elements within the same group have similar outer electron configurations due to their placement in the same column. This similarity in electron configuration leads to similar chemical properties and reactivity.

Elements in the same group have the same number of valence electrons, which are the electrons involved in chemical reactions. These valence electrons determine an element's ability to form bonds and participate in reactions. Therefore, elements in the same group often exhibit similar patterns of chemical reactivity and tend to undergo the same types of reactions.

In contrast, elements in the same period have different outer electron configurations, which result in varying chemical properties and reactivity. While elements in the same period may share some similarities, they are less likely to undergo the same kinds of reactions compared to elements in the same group.

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Answer:2.18 g.

Explanation:To find the mass of sodium sulfate reacted, we use the balanced chemical equation to know that 1 mole of sodium sulfate reacts with 1 mole of barium sulfate. From the given mass of barium sulfate formed, we calculate the number of moles of barium sulfate. Since the stoichiometry of the reaction is 1:1, the number of moles of sodium sulfate reacted is the same as the number of moles of barium sulfate formed. We then use the molar mass of sodium sulfate to calculate the mass of sodium sulfate reacted. The final answer is 2.18 g.

From the samples on the slide made up of tiny cells, Terry can conclude that the cells were produced by other cells.

Cell production occurs often in a human protein, such as yeast, bacteria, or mammalian cells in culture, which then start producing the protein in large quantities. A new organism is created during the process of splicing a gene into a production cell.

Cells are often produced from other cells by the process of replication. All living things, from microorganisms to humans, rely on cells for structure and function. Scientists regard them as the tiniest form of life. Cells contain the biological machinery that produces the proteins, chemicals, and signals that are responsible for everything that occurs within our bodies.

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Answer:

The answer is

Explanation:

To convert the volume from cm³ to mL we use the conversion

1 cm³ = 1 mL

So from the question

if 1 cm³ = 1 mL

Then 150 cm³ = 150 mL

Hope this helps you

Answer:

The five main postulates of the KMT are as follows: (1) the particles in a gas are in constant, random motion, (2) the combined volume of the particles is negligible, (3) the particles exert no forces on one another, (4) any collisions between the particles are completely elastic, and (5) the average kinetic energy of ...

Explanation:

Compared to an atom as a whole, an atomic nucleus Is very tiny but has most of the mass. Correct answer: letter A.

Because atoms are composed of protons, neutrons and electrons. The protons and neutrons are found in the nucleus, which is very small compared to the atom as a whole. However, the protons and neutrons have much more mass than the electrons, so the nucleus has most of the mass of the atom.

An atom is the smallest unit of matter that can exist. Atoms are made up of three particles:

Atoms are the building blocks of all matter in the universe.

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Answer:

Chain reaction

Explanation:

Abundant sunlight did not play a major role in the formation of fossil fuels from plant matter; instead, factors such as high temperatures, an absence of oxygen, and high pressures were key in their formation.

The factor that did not play a major role in the formation of fossil fuels from plant matter is B) abundant sunlight. Fossil fuels, such as coal, oil, and natural gas, are formed from the remains of ancient plants and organisms that were buried and subjected to intense heat and pressure over millions of years. During this process, organic material undergoes biochemical and geological changes, resulting in the formation of fossil fuels.

While abundant sunlight is essential for the growth of plants through photosynthesis, it does not directly contribute to the formation of fossil fuels. Instead, the key factors in their formation are high temperatures, an absence of oxygen (anaerobic conditions), and high pressures. These conditions are typically found deep underground, where plant matter gets buried and subjected to geological processes.

High temperatures facilitate the thermal decomposition of organic compounds, converting them into hydrocarbons. An absence of oxygen prevents complete combustion and allows the accumulation of carbon-rich materials. High pressures help compress the organic matter, promoting chemical reactions and transforming it into dense energy-rich substances like coal, oil, and natural gas.

In summary, while abundant sunlight is crucial for plant growth, it is not a direct factor in the formation of fossil fuels. The key factors involved are high temperatures, an absence of oxygen, and high pressures during the geological processes of burial and transformation.

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The compound that does NOT obey the octet rule is option c) \(ClF_3\).

let's examine each option:

A. KBr: Potassium bromide has both potassium (K) and bromine (Br) atoms following the octet rule, as potassium loses one electron to form a +1 ion, and bromine gains one electron to form a -1 ion.

B. \(CO_2\): In carbon dioxide, the carbon atom is double-bonded to two oxygen atoms. Each oxygen has 6 valence electrons, and carbon has 4. By sharing 2 electrons with each oxygen, carbon achieves an octet, and so do the oxygen atoms.

C. \(ClF_3\): Chlorine trifluoride is the correct answer. In this compound, chlorine has 10 electrons around it - 3 from the bonds with the fluorine atoms and 2 lone pairs. This molecule has an expanded octet, meaning that the chlorine atom does NOT obey the octet rule.

D. ICl: Iodine monochloride has iodine (I) and chlorine (Cl) atoms forming a single covalent bond. Both atoms follow the octet rule in this compound, as they share a pair of electrons to complete their valence shells.

Therefore, the compound with an atom that does NOT obey the octet rule is \(ClF_3\).

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To determine the amount of filtrate formed in 1 minute, we use the given information that 10% of renal blood flow becomes filtrate. If the renal blood flow is 1 L/min, then 10% of that is 100 ml/min.

2. To find the amount of filtrate formed in 1 hour, we multiply the filtrate formed per minute (100 ml/min) by the number of minutes in an hour (60). This gives us 6,000 ml or 6 L of filtrate formed in 1 hour.3. For the amount of filtrate formed in 1 day, we multiply the filtrate formed per minute (100 ml/min) by the number of minutes in a day (1,440). This gives us 144,000 ml or 144 L of filtrate formed in 1 day.

4. To calculate the amount of filtrate reabsorbed per day, we subtract the amount of urine formed per day from the amount of filtrate formed per day. Given that roughly 2 L of urine are formed per day, the amount of filtrate reabsorbed would be 144 L - 2 L = 142 L. 5. The purpose of forming such a large amount of filtrate can be understood in terms of kidney function. The kidneys play a vital role in maintaining homeostasis by regulating the balance of various substances in the body. The filtration process allows for the removal of waste products, excess ions, and toxins from the blood. Additionally, it allows for the selective reabsorption of essential substances back into the bloodstream, ensuring their retention and proper functioning in the body. The large amount of filtrate formed provides the kidneys with a higher chance of effectively filtering waste and maintaining appropriate levels of essential substances.

6. To calculate the amount of filtered sodium (Na+) per day, we need to consider the glomerular filtration rate (GFR) and the concentration of plasma Na+. Given that the GFR is 125 ml/min and the plasma Na+ concentration is 140 mM (millimolar), we can multiply these values to find the amount of Na+ filtered per minute. This gives us 125 ml/min * 140 mM = 17,500 millimoles of Na+ filtered per minute. To convert this to per day, we multiply by the number of minutes in a day (1,440).

Thus, the amount of Na+ filtered per day would be 17,500 millimoles/min * 1,440 min/day = 25,200,000 millimoles or 25,200 moles of Na+ per day.

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To find the mass percent composition of an element, divide the mass contribution of the element by the total mass then multiply by 100.

The total mass = 200.0 g

Phosphorus mass = 87.28 g

Oxygen mass = 112.72 g

%composition of P:

=> (87.28 g/200.0g)*100

=> 43.64 %

%composition of O:

=> (112.72g/200.0 g)*100

=> 56.36 %

Answer:

B: 1s²2s²2p¹

Na: 1s²2s²2p⁶3s¹

Explanation:

A = 2

B = 1

C = 2

D = 6

E = 1

Orbitals that are described by each of the combinations quantum numbers ; n = 3, ℓ =2 orbitals n = 4, ℓ = 2 is 5. ml=2 here is referring to last(5th) orbital space 4d.

In atomic theory and quantum mechanics, atomic orbital is a function describing the location and wave-like behavior of electron in an atom.

Quantum numbers  (n, l, ml, ms )

n=3, refers to 3rd energy level      

3rd energy level has 3 possible values of l  and d has 5 different orientations.

s=0   p=1    d=2

--> -2,-1,0,1,2

When; n=3 l=2, then number of orbitals is 5.

n=4 refers to 4th energy level ;        

4th level has 4 possible l values;      

s=0 p=1 d=2 f=3        

When, n=4   l=2 and  ml=2  

The number of orbitals is 5 and  ml=2 is referring to last(5th) orbital space 4d.

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \)

From the question

mass = 12.9 g

volume = 8 cm³

The density of the block is

\(density = \frac{12.9}{8} \\ = 1.6125\)

We have the final answer as

Hope this helps you

(a) The wet volumetric and gravimetric analysis of the products of combustion can be determined by considering the stoichiometric combustion reaction. b) In the stoichiometric ratio, the exact amount of air is provided for complete combustion without any excess fuel or oxygen remaining.

(a) The wet volumetric and gravimetric analysis of the products of combustion for LPG with an equivalence ratio (ø) of 1.0 can be determined by considering the stoichiometric combustion reaction. For complete combustion, the reaction equation is:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Based on the composition of LPG, which is 60% propane and 40% butane by volume, we can calculate the molar ratio of propane to butane in the fuel mixture. Using the balanced reaction equation, we can then determine the molar ratio of the products of combustion. The wet volumetric analysis represents the volume fraction of each product gas, while the gravimetric analysis represents the mass fraction of each product.

(b) The stoichiometric air to fuel ratio (AFR) for LPG can be determined based on the balanced reaction equation and the stoichiometry of the combustion process. In the stoichiometric ratio, the exact amount of air is provided for complete combustion without any excess fuel or oxygen remaining.

From the stoichiometric reaction equation mentioned earlier, we can determine the molar ratio of oxygen to propane. Since the composition of LPG is known, we can use this information to calculate the stoichiometric AFR, which represents the ideal ratio of air to fuel required for complete combustion.

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Answer:

Ionic

Explanation:

A transfer of electrons occurs when fluorine and calcium react to form an ionic compound. This is because calcium is in group two and so forms ions with a two positive charge. Fluorine is in group seven so forms ions with a negative charge.

The genotype probability is :

PP = 25 %

Pp = 50 %

pp = 25 %

Phenotype probability:

Purple color) = 75 %

white color = 25 %

The genotype of an offspring is the sum total of all the genes inherited from the parents.

The phenotype is the physical expression of that genotype.

Given that purple color P is dominant over white color, p in flowers, the cross between two heterozygous purple-colored flower plant, Pp will produce the following genotype and phenotype probabilities:

Pp x Pp = PP, Pp, Pp, pp

Genotype ratio will:

PP = 25 %

Pp = 50 %

pp = 25 %

Phenotype ratio:

Purple color (PP, Pp, Pp) = 75 %

white color (pp) = 25 %

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Answer:

Some of the common impacts of earthquakes include structural damage to buildings, fires, damage to bridges and highways, initiation of slope failures, liquefaction, and tsunami.