One kg of Aluminum ( 2,700 kg/m3 ) and one kg of Lead ( 3,000 kg/m3 ) are dropped into a beaker of water, and they both sink, of course. Which object has the largest magnitude buoyant force on it? A) Aluminum B) Lead C) Same buoyant force on both, and the buoyant force is upwards.
D) Same buoyant force on both, and the buoyant force is downwards E) Same buoyant force on both, and the buoyant force is zero

The molecular mass of a compound is the sum of the atomic masses of all the atoms in a molecule. It is calculated by adding up the atomic masses of each element in the compound, as indicated by its molecular formula.

On the other hand, the formula mass is the sum of the atomic masses of all the atoms in a formula unit of an ionic compound. It is calculated in a similar manner as the molecular mass, but instead of using the molecular formula, we use the empirical formula or the simplest ratio of elements in the compound.

To differentiate between the two, molecular mass is used for covalent compounds, where atoms are held together by covalent bonds, while formula mass is used for ionic compounds, where ions are held together by ionic bonds.

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Sirloin steak typically has the lowest water content and the correct option is option 4.

Meat, being a protein-rich food, generally contains a lower percentage of water compared to fruits, vegetables, and bread. While lettuce and tomatoes are primarily composed of water, with high water content contributing to their crispness and juiciness, whole grain bread also retains a significant amount of moisture.

On the other hand, sirloin steak consists mostly of muscle tissue, which contains less water. However, it is important to note that the exact water content can vary depending on factors such as the specific cut of meat, cooking method, and degree of doneness.

Thus, the ideal selection is option 4.

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Answer: nitrogen

Explanation:

Answer:

weathering and erosion

Explanation:

Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.

Answer:

weathering and erosion

The controversy surrounding beryllium's atomic mass arose from differing assumptions about its valence and resulting formula of its oxide. Berzelius believed it was trivalent (Be3+), while Mendeleev thought it was divalent (Be2+). A. Combes later reacted beryllium with an anion and measured the density of the gaseous product to determine its atomic mass, obtaining data in two different experiments.

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Answer:

Chemicals are substances in any form of matter with a chemical composition and property. Chemical reaction involves the combination of two or more different atoms chemically combined together, which are not easily separated.

Explanation:

CHEMICALS

CHEMICAL REACTIONS

NEITHER

The temperature of the ball is one element that might affect how it bounces. A ball will bounce higher than a cold one if it is warmer. This is due to two factors.

When the temperature of a hollow ball changes, the air pressure inside the ball also changes. The balls bounced higher when they were hot and lower when they were cold. The air temperature inside the ball and the rubber's elasticity were both impacted by the temperature shift, which also changed the height of the ball's bounce. The sum of a ball's material characteristics surface textures, constituent materials, air content, hardness or softness, etc. affects the height of its bounce.

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Answer:

(I would appreciate a thanks, a rating and/or a Brainliest rating if this helped you)

Answer:

2.35 x 10^-19 joules

Explanation:

The energy (E) of a photon can be calculated using the following formula:

 E = hν

where h is Planck's constant (6.626 x 10^-34 joule seconds) and ν is the frequency of the radiation.

So, to calculate the energy of a photon with a frequency of 3.54 x 10^14 hertz, we can substitute the values in the formula:

 E = (6.626 x 10^-34 J s) x (3.54 x 10^14 Hz)

E = 2.35 x 10^-19 joules

Therefore, the energy of a photon of radiation with a frequency of 3.54×10^14 hertz is 2.35 x 10^-19 joules.

Argument against the Fifteenth Amendment: The Fifteenth Amendment, which grants the right to vote regardless of race, should not have been ratified because it undermines the principle of states' rights.

Reason why this argument is incorrect: The argument incorrectly assumes that the Fifteenth Amendment infringes upon states' rights. However, the purpose of the amendment is to protect the individual right to vote and prevent discrimination based on race. By ensuring equal voting rights for all citizens, the amendment upholds the principles of equality and democracy. It does not undermine states' rights but rather promotes the fundamental democratic values upon which the United States was founded. The Fifteenth Amendment serves to rectify historical injustices and expand the inclusive nature of the democratic process, contributing to a more equitable and representative society.

Argumentation is derived from the verb to argue which means to prove or convey reasons and convince the reader. Argumentative paragraphs aim to convey an opinion, conception, or written opinion to the reader

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Answer:

k

Explanation:

Hypothesis: The most absorbent paper product will be paper towels. The benchmark group will be plain white paper.

The paper towel experiment hypothesizes that the paper towel rate of water absorption is influenced by its thickness.

More specifically, the hypothesis states that thicker paper towels will have a faster rate of water absorption than thinner ones. The researcher will measure the amount of time it takes for each kind of paper towel to absorb a certain volume of water in order to test this hypothesis.

They will then compare the results to see if there is a connection between the paper towel's rate of water absorption and its thickness.

The hypothesis states that the thicker paper towels should be able to absorb water more quickly than the thinner ones.

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The mass of H2O2 dissolved is not directly provided in the given information. Additional calculations or data are required to determine the mass of H2O2 dissolved.

The mass of hydrogen peroxide (H2O2) dissolved in 100 ml of water is calculated to be approximately X grams.

To determine the mass of H2O2 dissolved, we can use the balanced chemical equation for the reaction between hydrogen peroxide and potassium permanganate:

5H2O2 + 2KMnO4 + 3H2SO4 → 5O2 + 2MnSO4 + 3H2O + K2SO4

From the balanced equation, we can see that the mole ratio between H2O2 and KMnO4 is 5:2.

Given that 21 ml of 1.68 M KMnO4 solution was required for the titration, we can calculate the number of moles of KMnO4 used:

Volume of KMnO4 solution = 21 ml = 0.021 L

Molarity of KMnO4 solution = 1.68 M

Number of moles of KMnO4 = Molarity × Volume

= 1.68 M × 0.021 L

= 0.03528 moles

Using the mole ratio, we can determine the number of moles of H2O2:

Number of moles of H2O2 = (5/2) × Number of moles of KMnO4

= (5/2) × 0.03528 moles

To convert moles of H2O2 to grams, we need to multiply by its molar mass. The molar mass of H2O2 is approximately 34.02 g/mol.

Mass of H2O2 = Number of moles of H2O2 × Molar mass of H2O2

= (5/2) × 0.03528 moles × 34.02 g/mole

The mass of hydrogen peroxide (H2O2) dissolved in 100 ml of water is approximately X grams. This value was determined by titrating the H2O2 solution with a 1.68 M KMnO4 solution, and the titration required 21 ml of the KMnO4 solution. The calculation involved using the balanced chemical equation, molar ratios, and the molar mass of H2O2 to convert the volume of KMnO4 used to the mass of H2O2 dissolved.

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Answer:

D) absorbs energy

The general formula for an aldehyde is CnH2n+1CHO or CnH2nO.

An aldehyde is an organic chemical that contains a functional group with the formula RCH=O. The functional group (without the "R" side chain) is an aldehyde, however it can also be categorized as a formyl group. Aldehydes are widely used and serve vital roles in industry and biology.

Aldehydes have a carbon center that is linked to oxygen by a double bond, hydrogen by a single bond, and a third substituent, which is carbon or, in the case of formaldehyde, hydrogen by a single bond. The middle carbon is frequently described as sp2-hybridized. The aldehyde group is polar in several ways. The length of the C=O bond is around 120-122 picometers.

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The factor most sensitive to changes in temperature is the thermal expansion coefficient of a material.

In physics, the sensitivity of a factor to changes in temperature is determined by its thermal expansion coefficient. The thermal expansion coefficient measures how much a material expands or contracts when its temperature changes. Different materials have different thermal expansion coefficients, which determine their sensitivity to temperature changes.

For example, solids generally expand when heated and contract when cooled. This is because the atoms or molecules in a solid vibrate more vigorously as the temperature increases, causing them to move further apart and the material to expand. Conversely, when the temperature decreases, the atoms or molecules vibrate less, causing the material to contract.

Gases, on the other hand, are highly sensitive to changes in temperature. When a gas is heated, its molecules move faster and collide more frequently, leading to an increase in pressure and volume. As a result, gases expand significantly with temperature increases. Conversely, when a gas is cooled, its molecules move slower and collide less frequently, leading to a decrease in pressure and volume.

Liquids also expand with temperature, but to a lesser extent than gases. The expansion of liquids is due to the increased kinetic energy of their molecules, which causes them to move further apart. However, the intermolecular forces in liquids are stronger than in gases, limiting their expansion.

Understanding the thermal expansion properties of materials is important in various fields. For example, in engineering and construction, knowledge of thermal expansion helps prevent structural damage caused by temperature changes. In manufacturing, it is crucial for designing and producing components that can withstand temperature variations without failure.

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The factor that is most sensitive to changes in temperature is the enzyme activity or enzymatic reactions.

What is an enzyme?

An enzyme is a biomolecule that is a catalyzer in various biological and chemical processes, accelerating the rate of a chemical reaction without itself being affected.

What is the effect of temperature on enzymes?

Temperature affects enzyme activity by modifying the enzyme's three-dimensional shape, leading to a higher rate of reaction until a particular temperature is reached, after which the reaction rate begins to decrease, resulting in enzyme denaturation and a decrease in enzyme activity.

Factors that affect enzyme activity are:

Temperature: Enzyme activity is highly influenced by temperature, with the optimal temperature for enzyme activity generally ranging from 30°C to 40°C, depending on the enzyme's origin. When the temperature is lowered, the enzyme activity slows down until it ceases to function, resulting in a decrease in the rate of reaction. The rate of reaction increases with increasing temperature until it reaches the maximum point at which the enzyme becomes denatured and stops functioning. Therefore, enzymes are the most temperature-sensitive factor.

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The subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).

The properties of an element are primarily determined by its atomic structure. Elements are characterized by the number of protons, neutrons, and electrons they possess.

Protons and neutrons are located in the nucleus of an atom, while electrons orbit around the nucleus in energy levels or shells.

The electron configuration of an atom, specifically the arrangement and distribution of electrons in the outermost shell, is what primarily influences the chemical and physical properties of an element. The behavior of atoms in chemical reactions, bonding patterns, and electrical conductivity are all related to the movement and interactions of electrons.

Although protons and neutrons contribute to factors such as atomic mass and stability, the electron's involvement in chemical reactions and interactions is most significant in determining an element's properties.

Therefore, the subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).

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A metal ion or perhaps an ammonium ion takes the place of the acid's H+ ion. A neutralization is the process by which a base and an acid combine to form a salt.

Any substance is called an acid if it tastes bad in water solution, colors blue litmus litmus red, reacts with certain metals so release hydrogen, mixes with bases to form salts, and activates chemical reactions (acid catalysis).

In industrial or organic chemistry, acids are utilized as catalysts; for instance, sulfuric acid is often used in extremely high volumes during the alkylation process of creating gasoline. Some acids, including hydrochloric, phosphoric, and sulfuric acid ( h2so4, can also cause condensation and dehydration processes.

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This suggests that the unknown starting material is likely an organic compound containing a carboxylic acid functional group.

Compound is a combination of two or more elements which are chemically bonded together. Compounds can exist in both organic and inorganic forms, and are formed when atoms of different elements combine to form molecules. Inorganic compounds are generally composed of metal and non-metal elements, while organic compounds are composed of only carbon and hydrogen atoms. Compounds can also be classified according to their physical state, such as solid, liquid, or gas. Compounds are important in many areas of science, such as chemistry, physics, and biology, and play an essential role in the production of many products, including medicines, plastics, and fuels.

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Answer:

18 electrons

Explanation:

Answer:

18 electrons

Explanation:

Ca has 20 electrons. Ca^2+ has 18 electrons

B) Surfactant is a phospholipid molecule that prevents alveoli from collapsing. It reduces surface tension in the lungs, allowing the alveoli to remain open and facilitating efficient breathing.

Phospholipid molecules that prevent the alveoli from collapsing are known as surfactants. Surfactant is a substance composed of phospholipids, proteins, and other components. It is produced by specialized cells in the lungs called type II alveolar cells.

The primary function of surfactant is to reduce the surface tension within the alveoli, which are tiny air sacs in the lungs where gas exchange takes place. Without surfactant, the surface tension would be too high, causing the alveoli to collapse during exhalation. Surfactant molecules disrupt the cohesive forces between water molecules on the alveolar surface, allowing the alveoli to remain open and preventing them from sticking together. The presence of surfactant is crucial for efficient breathing and maintaining lung function. In conditions where surfactant production is reduced or absent, such as in premature infants or certain lung diseases, respiratory distress syndrome and other breathing difficulties can occur.

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120 ice cubes were left in the ice cube tray

a) If the average mass of an ice cube is m_ice cube ≈ 325 g and 1.24 × 10^6 J of energy is absorbed by ice cubes from the environment, then the mass of the ice cubes left in the tray would be: ΔHfusion = mL ice = 334 × 10^3 J/kg

m_ice cube = ΔH/ΔHfusion

                    = (1.24 × 10^6 J)/(334 × 10^3 J/kg) × 325 g

                    ≈ 120 ice cubes

b)

We can use the formula for entropy change to calculate the total change in entropy of the ice cubes:

ΔS_ice = m_ice cube × c_ice × ln(T_f/T_i) + m_ice cube × ln(melting)

where c_ice is the specific heat capacity of ice, T_f is the final temperature of the ice (0°C), T_i is the initial temperature of the ice (-18°C), and "melting" is the ratio of the mass of the ice that melts to the total mass of ice. At 0°C, all the ice that melts has to absorb energy to complete the melting process, but no temperature change occurs. We can express this energy as mL_ice, where L_ice is the heat of fusion of ice. Hence:

melting = mL_ice/(m_ice cube × ΔH_fusion)

            = 1

We have:

c_ice = 2100 J/kg

KΔH_fusion = L_ice

                    = 334 × 10^3 J/kg

T_f = 0°C

T_i = -18°C

To calculate ln(T_f/T_i), we first need to convert the temperatures to Kelvin: T_f = 273 K T_i = 255 K, ln(T_f/T_i) = ln(273 K/255 K) ≈ 0.067

The entropy change for each ice cube is thus:

ΔS_ice = m_ice cube × c_ice × ln(T_f/T_i) + m_ice cube × ln(melting)≈ 325 g × 2100 J/kg K × 0.067 + 325 g × ln(1)≈ 47.4 J/K

The total change in entropy is therefore:

ΔS_total = ΔS_ice × N_ice cube

               ≈ 47.4 J/K × 120 ≈ 5688 J/Kc)

The change in entropy of the environment can be calculated using the formula:

ΔS_env = ΔQ/T_envwhere

ΔQ is the heat absorbed by the environment, and T_env is the temperature of the environment. Since the ice cubes absorb heat from the environment, ΔQ is negative, and we have:

ΔS_env = -|ΔQ|/T_env

= -1.24 × 10^6 J/298 K

≈ -4161 J/K

The negative sign indicates that the entropy of the environment decreased during the process, which is consistent with the fact that heat is transferred from the environment to the ice cubes. This entropy change is larger in magnitude than the entropy change of the ice cubes, which means that the net change in entropy is negative. This is expected, since the process is not reversible (the ice cubes cannot spontaneously refreeze), and the total entropy of a closed system tends to increase over time. Therefore, our answer makes sense.

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Answer:

B A B  sorry if its wrong

Explanation:

Circuits can be connected in series or parallel but the maximum voltage is obtained in series connection, thus, light bulbs shine brightest in series connection.

A parallel circuit connection is one in which the terminals of all the components in th circuit meet at two points.

The components are parallel to each other and current flows in multiple directions.

A series connection in a circuit is one in which the terminals of the component parts in a circuit are joined end to end. Current flows in one direction.

The voltage in a series connection is the sum of all the individual cells, therefore, the light bulb in series connection shines brightest.

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A chemical element is a substance that can not be degraded chemically. Although chemical responses don't change rudiments, nuclear responses can produce new rudiments.

What is Compound?

Each matter in the macrocosm is made up of tittles from over 100 different chemical rudiments, which can be set up in pure form or combined in chemical composites. A pure element sample is made up of only the tittles that are characteristic of that element, and each element's tittles are unique.

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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 = 47 g

volume = 75 mL

The density is

\(density = \frac{47}{75} \\ = 0.626666666...\)

We have the final answer as

Hope this helps you

Sigma bonds are known to have cylindrical charge symmetry around the axis of the bond. No symmetry exists in pi bonds. Atoms with sigma bonds are less reactive. Atoms with pi bonds are highly reactive when compared to those with only sigma bonds.

Answer:

O2(oxygen)

Explanation:

Reduced means the valence electrons are gained. From this equation we see in CO2, C is 4+ and for each O there's a 2-, however, originally, C and O2 are all 0, it's obvious that O is reduced from 0 to 2-

Answer:

4.6 kJ

Explanation:

The energy required to raise the temperature of a substance from its initial temperature to a final temperature is given by:

Q = mcΔT

Where Q = energy, c = specific heat capacity of substance and ΔT = final temperature - initial temperature

Given that:

c = 2.1 kJ/kg°C, m = 87.5 = 0.0875 kg, ΔT = final temperature - initial temperature  = 0 - (-25) = 25

Q = 0.0875 * 2.1 *25

Q = 4.6 kJ

Answer:

solid=(s)

Explanation:

A solubility table may be something your class may want you to memorize. Where an aqueous (aq) solution is formed by a soluble compound dissolving in water, our solvent. So if we refer to this solubility table, it says phosphate (PO4) is usually insoluble, so in the reaction it won't break down in water and will stay as a solid (s). The only exceptions are group 1 alkali metals or ammonium (NH4+).