Which of the following is a property of a liquid?
А A
It has a definite shape.
B
It does not have a definite mass.
с
It takes the shape of the container you choose.
D
Its atoms are packed tightly together.

Answer:

Explanation:

Start by restating the question.

So how is the crumple zone rigidity, crumple zone deformation , and the maximum force of the dummy similar, and how are they different?

The crumple zone increases, the crumple zone deformation increases then decreases then repeated in increasing and decreasing , and the maximum force decreases. Hope that helps!

Answer:

The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people. The trachea begins just under the larynx (voice box) and runs down behind the breastbone (sternum).

Explanation:

Answer:

two

Explanation:

Answer:

Explanation:

In a solid, the attractive forces keep the particles together tightly enough so that the particles do not move past each other. ... The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other.

enthalpy of reaction AH° = +650 kJ  for the following thermochemical equation. 5H2S04(1) -> 5S03(8) 5H20(1)

Given ,503(g) + 420/1) + H2S04(0); . Reverse the reaction is also change the sign of OH. H₂ So3 (1) 503(g) + H2O(1), DH" = +130kJ.Multiplying this equation by s. 512 804 11) 550₂ (g) + SH₂0 (1), DH" = 5X (+130kJ)= +650kJ. AH° = +650 kJ.This quantity, H, is referred to as the enthalpy of reaction or the reaction's heat. The quantification of heat published or soaked up by a chemical reaction is known as calorimetry. The quantity of heat transferred by the reaction causes the the solution's temperature to change. A scientist can use Delta H to ascertain whether a reaction emits heat (or is exothermic) or absorbs heat (or is endothermic) (or is endothermic). Delta H = m x s x Delta T, at which m represents the mass of a reagents, s is the heat capacity of the product, as well as Delta T is the temperature change caused by the reaction.

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Answer:

A chemical change results in a new substance being formed whereas a physical change will result in a different state of matter

The grams of NH₃ produced in the reaction is approximately 0.879 g.

To calculate the grams of NH₃ produced, we need to determine the limiting reactant and then calculate the theoretical yield.

1. Calculate the moles of N₂:

Molar mass of N₂ = 28.02 g/mol

moles of N₂ = mass / molar mass = 25.0 g / 28.02 g/mol ≈ 0.892 mol N₂

2. Calculate the moles of H₂:

Molar mass of H₂ = 2.02 g/mol

moles of H₂ = mass / molar mass = 2.00 g / 2.02 g/mol ≈ 0.990 mol H₂

3. Determine the mole ratio between N₂ and NH₂:

From the balanced equation for the formation of ammonia (NH3) from nitrogen (N₂) and hydrogen (H₂):

N₂ + 3H₂ -> 2NH₂

The mole ratio between N₂ and NH₃ is 1:2.

4. Identify the limiting reactant:

Compare the moles of N₂ and H₂ to identify the limiting reactant. The reactant that produces fewer moles of NH₃ will be the limiting reactant.

moles of NH₃ formed from N₂ = moles of N₂ × (2 moles of NH₃ / 1 mole of N₂) ≈ 0.892 mol N₂ × (2 mol NH₃ / 1 mol N₂) ≈ 1.784 mol NH₃

moles of NH₃ formed from H₂ = moles of H₂ × (2 moles of NH₃ / 3 moles of H₂) ≈ 0.990 mol H₂ × (2 mol NH₃ / 3 mol H₂) ≈ 0.660 mol NH₃

Since the moles of NH₃ formed from N₂ (1.784 mol NH₃) are higher than the moles of NH₃ formed from H₂ (0.660 mol NH₃), N₂ is the limiting reactant.

5. Calculate the theoretical yield of NH₃:

Theoretical yield of NH₃ = moles of NH₃ formed (limiting reactant) × molar mass of NH₃

Theoretical yield of NH₃ = 0.660 mol NH₃ × 17.03 g/mol ≈ 11.258 g NH₃

6. Calculate the actual yield:

The actual yield is given as 7.82% of the theoretical yield.

Actual yield of NH₃ = theoretical yield of NH₃ × (7.82 / 100) ≈ 11.258 g NH₃ × (7.82 / 100) ≈ 0.879 g NH₃

Therefore, the grams of NH₃ produced in the reaction is approximately 0.879 g.

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The following remains constant when water undergoes a phase change  is temperature.

The temperature remains constant during the phase change of any substances. the energy is used in the process of phase change to breaks the bonds ,since there is no increase in kinetic energy , so. there is rise in temperature. heat is used in latent heat conversion. Latent heat is the heat that absorbed or released during the phase change. temperature remains same until the phase change is completed. the phase happens with the change of heat.

Thus, The following remains constant when water undergoes a phase change is temperature.

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Answer:

covalent

Explanation:

flourine and sulfur are both nonmetals/anions, therefore it is covalent.

Aluminum chloride (AlCl₃) is a chemical compound formed from aluminum and chloride.

Aluminum chloride is a chemical compound that, while uncontaminated, is a white solid and, when contaminated with iron chloride, a yellow powder. The periodic table's group 13 and period 3 elements of aluminum and group 17 and period 3 elements of chlorine make up the entire formula for aluminum chloride.

Aluminum and chlorine ions combine to form aluminum chloride, a neutral ionic compound. Aluminum chloride has zero net charge overall. The chloride anion is a negatively charged ion Cl⁻, whereas the aluminum cation is a positively charged ion Al³⁺. The aluminium cation, which has three of its valence electrons transferred to chlorine, has more protons than electrons. Although it only requires one electron to reach the electron configuration of the noble gas argon, chlorine cannot accept more than one electron.

Hence, aluminum chloride is a neutral chemical compound

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Answer:

Explanation:

The equation for the reaction between potassium and water to produce potassium hydroxide and hydrogen gas is:

K + H2O -> KOH + H2

Using the ion-electron method, we can balance the equation as follows:

Write the unbalanced equation

K + H2O -> KOH + H2

Write the ionization equation for H2O (water)

H2O -> H+ + OH-

Multiply the coefficients in the ionization equation by the number of H2O molecules in the unbalanced equation (in this case, one) to balance the number of H+ and OH- ions

H2O -> H+ + OH-

Substitute the H+ and OH- ions into the unbalanced equation

K + H+ + OH- -> KOH + H2

Balance the remaining atoms and charge

K + H+ + OH- -> KOH + H2

check charge and atom balance

K + H+ + OH- -> KOH + H2

Simplify the equation

K + H2O -> KOH + H2

The balanced equation is K + H2O -> KOH + H2

Answer:

The metamorphism of limestone results in the formation of marble

Explanation:

The reaction has not yet started, and the time required for 16.8% of the reactant to remain cannot be calculated using the given rate constant.

Given,The rate constant for this first-order reaction is 0.0830 s−1 at 400 ∘C.A⟶products After how many seconds will 16.8% of the reactant remain-The time taken for a first-order reaction to reach a particular percentage of completion can be calculated using the following formula:t = (ln(A/A₀))/kwhere A₀ is the initial concentration of the reactant, A is the concentration of the reactant at a given time, k is the rate constant, and t is the time elapsed since the reaction began.In this question, we are given the rate constant, k = 0.0830 s−1 at 400 ∘C, and we want to find out the time required for 16.8% of the reactant to remain.Let's assume that the initial concentration of the reactant is 100 units (we can assume any value as it does not affect the percentage of completion).Therefore, the concentration of the reactant remaining after 16.8% of completion would be: A = 16.8 units.Substituting these values in the above formula, we get:t = (ln(16.8/100))/0.0830t = (−1.7918)/0.0830t = −21.58 sThis time value is negative, which means that the reaction has not even started yet. Therefore, we need to check the given percentage of completion.

If it is less than 50%, we can assume that the reaction has not yet started. In this case, the percentage of completion is 16.8%, which is less than 50%.

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0.0989 grams of KOH is needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

Volume of HCl solution = 12.6 mL = 0.0126 L

The concentration of HCl solution = 0.14 M We have to find the amount of KOH required to neutralize the given volume and concentration of HCl.

In order to calculate the amount of KOH, we need to first calculate the number of moles of HCl using the formula of Molarity;

Molarity = (Number of moles of solute) / (Volume of solution in liters)0.14 M = n(HCl) / 0.0126L0.14 × 0.0126 = n(HCl)n(HCl) = 0.001764 moles of HCl

Now, the balanced chemical equation for the reaction of KOH with HCl is;KOH + HCl → KCl + H₂OOne mole of KOH reacts with one mole of HCl.

Therefore, the number of moles of KOH required to neutralize the given amount of HCl would be equal to 0.001764 moles. Now, let's calculate the amount of KOH in grams.

Molar mass of KOH = 39.1 + 16.00 + 1.008 = 56.108 g/mol0.001764 moles of KOH would weigh = 0.001764 × 56.108 = 0.0989

hence, the amount of KOH required to neutralize the given volume and concentration of HCl would be 0.0989 grams.

Thus, 0.0989 grams of KOH is needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

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Answer:2

Explanation:

The percent yield of the reaction is approximately 22%, which is closest to answer choice (a) 5.4%.

First, we need to determine the theoretical yield of H2O that would be produced based on the amount of H2 and O2 used in the reaction.

From the balanced chemical equation, we know that the ratio of H2 to H2O produced is 2:2, or 1:1. Therefore, if 4.00 g of H2 is used, the theoretical yield of H2O would be:

(4.00 g H2) / (2.016 g H2O/mol) x (2 mol H2O / 2 mol H2) x (18.015 g H2O/mol) = 8.91 g H2O

Next, we can calculate the percent yield of the reaction using the actual yield (1.94 g) and the theoretical yield (8.91 g):

Percent yield = (actual yield / theoretical yield) x 100%

Percent yield = (1.94 g / 8.91 g) x 100%

Percent yield = 21.8%

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Answer:

A catalyst speeds up a chemical reaction, without being consumed by the reaction. It increases the reaction rate by lowering the activation energy for a reaction. ... Remember that with a catalyst, the average kinetic energy of the molecules remains the same but the required energy decreases

Explanation:

...

hope that is helpful

The statement which is considered to be a good example of radiation is: B. Earth is heated by energy from the Sun.

In Science, there are three (3) main types of heat transfer and these include:

Radiation can be defined as the transmission (transfer) of energy in the form of waves particles through a material medium or space. Thus, radiation is a type of heat transfer which causes a person on Earth that is sitting under the Sun to feel warm.

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To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

Answer:

A. goat milk

Explanation:

Took the Quick Check

The phrase that describes carbon-14 dating is "decays into carbon-14 dates the remains of organisms to determine when they died" (Option B).

Carbon-14 dating is a method used to determine the age of organic materials by measuring the amount of carbon-14 in the sample and comparing it to the initial amount of carbon-14 when the organism was alive. As carbon-14 decays over time, the ratio of carbon-14 to carbon-12 in the sample changes, allowing scientists to calculate how long ago the organism died. It is not a method used to measure the number of unstable elements in ancient volcanic rocks.

Your options are incomplete, but most probably your options were

A) uses the rate at which nitrogen-14

B) decays into carbon-14 dates the remains of organisms to determine when they died

C) measures the number of unstable elements in ancient volcanic rocks

D) determines the age of ancient fossils older than 50,000 years old

Thus, the correct option is B.

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Answer: B.

Explanation:

The constituents of an aqueous solution that can transmit charge in a current are: chloride ions, sodium ions, hydroxide ions, and acetate ions.

In an aqueous solution, ions are responsible for transmitting charge in a current. When certain substances dissolve in water, they dissociate into ions, which are electrically charged particles. These ions can move freely in the solution and facilitate the flow of electric current.

Common ions found in aqueous solutions include:

Cations: Positively charged ions. Examples include hydrogen ions (H+), sodium ions (Na+), potassium ions (K+), calcium ions (Ca2+), and magnesium ions (Mg2+).

Anions: Negatively charged ions. Examples include hydroxide ions (OH-), chloride ions (Cl-), sulfate ions (SO42-), nitrate ions (NO3-), and carbonate ions (CO32-).

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Based on the balanced chemical equation provided:

ammonium chloride (aq) ⟶ ammonia (g) + hydrochloric acid (aq)

The stoichiometric coefficient in front of ammonium chloride is 1, indicating that for every 1 mole of ammonium chloride, we produce 1 mole of hydrochloric acid. Therefore, if we have 0.619 moles of hydrochloric acid, we would require an equal number of moles of ammonium chloride. So, the number of moles of ammonium chloride necessary would also be 0.619 moles.

In the given chemical reaction, the stoichiometric coefficients represent the mole-to-mole ratio between the reactants and products. Since the coefficient of ammonium chloride is 1, it indicates that 1 mole of ammonium chloride reacts to produce 1 mole of hydrochloric acid. Therefore, if we have 0.619 moles of hydrochloric acid, we can infer that the same amount of moles, 0.619 moles, of ammonium chloride is required to form that quantity of hydrochloric acid. The stoichiometry of the reaction allows us to establish this relationship and determine the amount of ammonium chloride needed based on the given amount of hydrochloric acid.

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The structure of the product formed when compound 3 is the substrate of a laccase-catalyzed reaction would depend on the specific reaction and conditions.

Laccases are oxidoreductase enzymes that catalyze the oxidation of substrates by reducing molecular oxygen to water. The reaction typically involves the removal of electrons from the substrate, resulting in the formation of a radical intermediate that can undergo further reactions.

The structure of the final product would therefore depend on the specific substrate and reaction conditions, including pH, temperature, and substrate concentration. Without further information about the specific reaction, it is difficult to determine the exact structure of the product

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The 14.6 kJ of heat is needed to raise the temperature of 300 g of ethanol from 0°C to 20°C. The correct option is C.

Thus, the following formula can be used to determine how much heat is needed to raise a substance's temperature: Heat (Q) is equal to mass (m), specific heat capacity (C), and temperature change (T).

The change in temperature (T) = 20°C, mass of ethanol (m) = 300 g, and specific heat capacity of ethanol (C) = 2.44 J/g-•C. The Q is computed using the following formula: Q = 300 g 2.44 J/g-•C 20°C, Q = 14,640 J

J to kJ conversion: Q = 14,640 J x 1000 = 14.64 kJ. Based on the known specific heat capacity of ethanol, this shows the amount of heat needed to increase the temperature of 300 g of ethanol from 0°C to 20°C.

Thus, the ideal selection is option C.

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Answer:

5 Significant Figures

Explanation:

State not play an important a significant role in the extent of harm upon exposure to a chemical.

What is meant by chemical?

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