helppp.....Which one of the following statements does not describe gold?

A. It exist as free element in nature

B. It is an excellent conductor

C. It has a yellow color

D. It reacts with oxygen in the presence of moist air

​

To keep the food safe, avoid exposing it to a higher temperature of 90°F ( as in Sun) may spoil the food making it unsafe for eating.

Food safety comprises four steps: cleaning, separating, cooking, and chilling.

Cleaning

Unwashed utensils or raw food items contain a lot of bacteria and other harmful pathogens that can cause food poisoning if we don't wash them properly. Thus, it is advised to always use washed utensils, clean chopping boards, knives, and washed vegetables to cook food.

Always use hot, soapy water for cleaning.

Separating

This step includes a food process known as cross-contact. In this process, an allergen is transferred from one food item to another accidentally; this happens especially when they come in contact with each other.

Therefore, we should keep the tools and the raw items separately so that the pathogens do not get mixed up.

Cooking

Cooking is the next step toward food safety. Cooking the food at an appropriate temperature kills the germs and avoids any food poisoning that may occur.

Chilling

This step involves refrigerating the food after cooking. If the cooked food is not served immediately after cooking it's always better to store the food in the fridge. If exposed to the higher temperature outside, it may get spoiled within a few hours (especially during summers). The refrigerator should be set to 40°F or below to keep the food safe.

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The genetic engineer showcased their dedication to their craft while expressing their individuality and creativity.

The genetic engineer, known for their groundbreaking work in manipulating DNA, decided to don a whimsical yet scientifically inspired ensemble for the dinner occasion. Embracing their passion for genetics, they playfully incorporated elements of their field into their attire. Their outfit included a crisp, white lab coat tailored to perfection, adorned with subtle DNA helix patterns woven into the fabric. Beneath the coat, they sported a stylish, molecular-themed tie, featuring intricate renderings of nucleotides and base pairs. Complementing their look, they wore a pair of polished, microscope slide cufflinks, adding a touch of scientific elegance. To complete the ensemble, they slipped into sleek, black dress pants and a pair of comfortable yet sophisticated shoes, allowing them to effortlessly navigate any scientific discussion that might arise during the evening.

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Answer:

A chemical property is a characteristic of a particular substance that can be observed in a chemical reaction. Some major chemical properties include flammability, toxicity, heat of combustion, pH value, rate of radioactive decay, and chemical stability.

The correct statement is a. At low temperatures, intermolecular forces become important and the pressure of a gas will be lower than predicted by the ideal gas law.

The ideal gas law assumes that gas particles have no volume and do not interact with each other, which is not completely true for real gases. At low temperatures, the gas particles move more slowly and are closer together, making intermolecular forces, such as van der Waals forces, more significant. These forces cause the gas particles to attract each other, reducing the effective number of particles and lowering the pressure. Statements b, c, and d are false. At a given temperature, lighter gas particles travel faster than heavier particles, not more slowly (statement b). The average kinetic energy of a gas sample increases with temperature, not decreases (statement c). At high pressures, the volume of individual gas particles becomes significant and cannot be neglected (statement d).

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Answer: (P2/P1)=(T2/T1)

(P2/1200.0kPa)=(387/283)

P2=(387K/283K) * (1200kPa)

P2= 1641kPa

Explanation:

An Oxygen Tank has a pressure of 1200 Kpa at 283K and when temp. is increased to 378 K then pressure will be 1,602.82 kpa.

From the ideal gas equation it is clear that pressure of gas is directly proportional to the temperature, and for this question required equation will be:

P₁/T₁ = P₂/T₂, where

P₁ = initial pressure of oxygen tank = 1200 kpa

T₁ = initial temperature of oxygen tank = 283 K

P₂ = final pressure of oxygen tank = ?

T₂ = final temperature of oxygen tank = 378 K

On putting values, we get

P₂ = (1200)(378) / (283) = 1,602.82 kpa

Hence resultant pressure of the oxygen tank is  1,602.82 kpa.

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The correct answer to this open question is the following.

Two examples of how engineers use their knowledge of atoms to create new technologies would be the following.

1.- Engineers can develop new medicines for chronic diseases when they use their knowledge about atoms. With new technologies and different scientific approaches, this new molecular medicine can be more effective in the treatment of terrible diseases that affect humans. The challenge lies in how to make these new medicines more affordable to all kinds of people, not only rich people.

2.- Engineers can also apply their knowledge about atoms to improve the water conditions so more people can have freshwater. Engineers that specialize in the environment can research the properties of water molecules and atoms, so they can develop new ways to purify and improve the quality of water, that we know that water scarcity is a major problem in many parts of the world.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{4.78 \times {10}^{24} }{6.02 \times {10}^{23} } \\ =7.940199...\)

We have the final answer as

Hope this helps you

Answer:

2 moles H

2

Explanation:

Your tool of choice here will be the mole ratio that exists between zinc metal,  

Zn

, and hydrochloric acid,  

:HCl

, in the balanced chemical equation.

Zn

(s]

+

2

HCl

(aq]

→

ZnCl

2(aq]

+

H

2(g]

↑

⏐

You're dealing with a single replacement reaction in which zinc displaces the hydrogen from hydrochloric acid. The products of the reaction are aqueous zinc chloride and hydrogen gas.

Now, as you can see from the balance chemical equation, a  

1

:

2

mole ratio exists between the two reactants.

This tells you that in order for the reaction to take place, you need to have twice as many moles of hydrochloric acid as you do of zinc metal.

http://people.springfield.k12.or.us/jim.tyser/chemcom/Resources/unit1ans.html

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At the same time, you have a  

2

:

1

mole ratio between hydrochloric acid and hydrogen gas.

This means that the reaction will always produce half as many moles of hydrogen gas as you have moles of hydrochloric acid.

Since you know that  

4

moles of hydrochloric acid are taking part in the reaction, and assuming that you have enough zinc metal so that it doesn't act as a limiting reagent, you can say that the reaction will produce

4

moles HCl

⋅

1 mole H

2

2

moles HCl

=

2 moles H

2

Explanation:

Answer:

The less valence electrons an atom has, the least likely it will gain electrons. Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in a higher energy level far

Explanation:

Answer:

Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons. Remember that greater the distance, the less of an attraction; thus, less energy is released when an electron is added to the outside orbital. In addition, the more valence electrons an element has, the more likely it is to gain electrons to form a stable octet. The less valence electrons an atom has, the least likely it will gain electrons.

Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in a higher energy level far from the nucleus, thus a decrease from its pull. However, one might think that since the number of valence electrons increase going down the group, the element should be more stable and have higher electron affinity. One fails to account for the shielding affect. As one goes down the period, the shielding effect increases, thus repulsion occurs between the electrons. This is why the attraction between the electron and the nucleus decreases as one goes down the group in the periodic table. hope i helped

Explanation:

Answer:

0.054 moles

Explanation:

It is the rounded off answer.

Common sources of the pollutant are factories. The control techniques for each of the six pollutants.

People can be exposed to dangerous air pollutant that pose health risks in a variety of ways, including ingesting contaminated air. consuming contaminated foods, such as tainted meat, milk, or eggs, contaminated produce grown in polluted soil where air toxics have been deposited, and infected fruits and vegetables. contaminated water from dangerous air pollution, Consuming poisonous soil. Young children are especially vulnerable since they regularly put objects in their mouths or absorb soil from their hands. Exposing your skin to contaminated dirt, dust, or water (for example, during recreational use of contaminated water bodies). The two primary categories of pollution sources are point sources and nonpoint sources. Point sources—small, distinguishable sources of pollution—include factories, mines, power plants, refineries, and wastewater treatment facilities. Nonpoint sources are those that are distributed over a wide geographic area, such a watershed. Nonpoint sources can also include mobility sources like cars, buses, and trains. While each of these are single point sources, their total effects are spread across a vast area because they are all moving.

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Answer:

1.30 moles

Explanation:

As written, the molar mass of the fat is 770.5 g/mole.  Add all the C, H, and O's (I get C48H98O6) and multiply by the molar mass of each.  I obtain the 770.5 grams/mole figure, but would note that a more common fat is actually C3H5(OH(CH2)14(CH3))3 and not C3H5(OO(CH2)14(CH3))3.

Assuming C3H5(OO(CH2)14(CH3))3 is the correct structure, 1000g would mean 1000g/(770.5 g/mole) = 1.298 moles, or 1.30 moles to 2 sig figs.

By reacting 1.4 moles of aluminum with sulfuric acid, it produces 1.05 moles of hydrogen gas at standard temperature and pressure (STP). The volume of hydrogen gas can be calculated using the ideal gas law and converted to liters.

According to the balanced chemical equation \(2Al (s) + 3H_2SO_4\)→ \(Al_2(SO_4)_3 + 3H_2\), we can see that 2 moles of aluminum react with 3 moles of sulfuric acid to produce 3 moles of hydrogen gas. This means that for every 2 moles of aluminum, 3 moles of hydrogen gas are produced.

Given that there are 1.4 moles of aluminum, we can set up a proportion to determine the moles of hydrogen gas produced. The proportion is as follows:

(1.4 moles Al) / (2 moles Al) = (x moles H2) / (3 moles H2)

Cross-multiplying, we find that x = (1.4 moles Al) × (3 moles H2) / (2 moles Al) = 2.1 moles H2.

Since the problem asks for the volume at STP, we can use the ideal gas law, PV = nRT, where P is the pressure (standard pressure at STP is 1 atm), V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature (standard temperature at STP is 273 K).

Substituting the values, we have (1 atm) × V = (2.1 moles) × (0.0821 L·atm/(mol·K)) × (273 K).

Simplifying, we find V = (2.1 moles) × (0.0821 L·atm/(mol·K)) × (273 K) = 47.6 L.

Therefore, the volume of hydrogen gas produced when dissolving 1.4 moles of aluminum in sulfuric acid at STP is 47.6 liters.

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A) The partial pressure of oxygen at the mountain top is 0.105 bar.

B) The balloon's volume at the mountain top is 2 I.

C) The partial pressure of nitrogen on Mars is 0.4 bar.

A) The partial pressure of a gas is calculated by multiplying the total pressure by the fraction of the gas in the mixture. In this case, the partial pressure of oxygen at the top of the mountain would be 0.5 bar multiplied by the concentration of oxygen at sea level, which is 0.21, resulting in 0.105 bar.

B) Boyle's law states that the volume of a gas is inversely proportional to its pressure at a constant temperature. Therefore, if the pressure decreases from 1 bar to 0.5 bar, the volume of the balloon would double, so its volume at the top of the mountain would be 2 I.

C) In a mixture of nitrogen and carbon dioxide with equal proportions (50:50) and a total atmospheric pressure of 0.8 bar, each gas contributes equally. Therefore, the partial pressure of nitrogen would be half of the total pressure, resulting in 0.4 bar.

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Explanation:

Answer:

blue only

Explanation:

mark me as a brainlist

Answer:

yes

Explanation:

60/500 is less than 133/1000 meaning that the glucose will be able to disolve without a salute

the final volume of air in the balloon  when the balloon is taken to a depth of 10ft in a swimming pool, where the pressure is 981 torr is 10.8 L. Answer: d) 10.8 L.

We are given the initial volume of air in the balloon, Vi = 14.0 L. The initial pressure, Pi = 760 torr. The final pressure, Pf = 981 torr. The depth of the swimming pool, h = 10 ft. The temperature of the air, T is constant, which means that the gas in the balloon is an ideal gas.

We can use Boyle's law and the pressure difference to find the final volume of air.Boyle's law states that at a constant temperature, the volume of a gas is inversely proportional to its pressure. That is,V_1/P_1 = V_2/P_2where V1 and P1 are the initial volume and pressure, and V2 and P2 are the final volume and pressure.

Rearranging this equation, we getV_2 = V_1 × P_1/P_2= 14.0 L × (760 torr)/(981 torr)= 10.8 L

Therefore, the final volume of air in the balloon is 10.8 L. Answer: d) 10.8 L.

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The substances are the heterogeneous mixtures are : a. II and III that is  the milk of magnesia and the crude oil.

The mixture are formed when two or the more substances are mix together without taking part in the chemical change. The heterogeneous mixture is the mixture where the components throughout the solution is not uniform. The mixture are two types :

In the heterogenous mixture the particles is distributed non uniformly and it can not be separated by the physical method.

Thus, the heterogenous mixture in the given option are the milk of the magnesia and the crude oil.

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Answer: C HNO3 and NaOh

Explanation:

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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Answer:

I guess it's nervous system

Answer:

Yah Its Nervous System.

Answer:

the answer is D

Explanation:

Air over the beach heats up, rises, and is replaced by cool, denser ocean air

The ocean heats up much slower and becomes relatively cooler than the beach making it a high pressure zone. The air moves from the water to the land each morning forming a sea breeze. These pressure zones might equal out later in the day and the winds may diminish. ... A sea breeze blows from the ocean towards the beach.

Answer: It is a Covalent Bond

Explanation:

In a chlorine molecule, the atoms bonded by a covalent bond as a chlorine atom needs one electron to complete its octet and shares one electron with another chlorine atom.

Answer:

mono covalent bonds

Explanation:

Cl shares 1 electron with another Cl atom

so it makes Cl2 a mono covalent compound

Answer:

True

Explanation:

Cell specialization is the process by which generic cells change into cells meant to do certain tasks within the body

hope this helps :)

Approximately 148.59 grams of carbon dioxide could be made.The remaining reactant, since \(O_2\)is the limiting reactant, all the CO will not be completely consumed. There would be no CO leftover as it is completely consumed in the reaction.

To determine the grams of carbon dioxide produced, we need to identify the limiting reactant first. The balanced chemical equation for the reaction is:

2 CO +\(O_2\) -> 2 \(CO_2\)

To find the limiting reactant, we compare the number of moles of each reactant and determine which one is present in a lower amount relative to the stoichiometry of the reaction.

First, we convert the given volumes of gases to moles using the ideal gas law equation:

n = PV / RT

where:

n = number of moles

P = pressure

V = volume

R = ideal gas constant

T = temperature

Assuming the reaction takes place at standard temperature and pressure (STP), which is 273.15 K and 1 atm, we can use the values to convert the volumes to moles:

For carbon monoxide (CO):

n(CO) = (75.3 L) / (22.414 L/mol) = 3.36 moles

For oxygen (O2):

n(O2) = (38.0 L) / (22.414 L/mol) = 1.69 moles

According to the balanced equation, the stoichiometry of the reaction is 2:1 for CO to \(O_2\)This means that for every 2 moles of CO, we need 1 mole of \(O_2\). In this case, the ratio of moles is 3.36:1.69, which shows an excess of CO.

To find the limiting reactant, we compare the mole ratio to the stoichiometry ratio. Since there is a surplus of CO, it is the excess reactant, and\(O_2\)is the limiting reactant.

To determine the amount of carbon dioxide produced, we use the stoichiometry of the reaction. From the balanced equation, we know that for every 2 moles of CO, 2 moles of CO2 are produced.

Since\(O_2\) is the limiting reactant, we use its moles to calculate the moles of \(Co_2\)produced:

n(\(CO_2\)) = 2 * n(\(O_2\)) = 2 * 1.69 moles = 3.38 moles

Finally, we convert the moles of\(CO_2\) to grams using the molar mass of carbon dioxide, which is 44.01 g/mol:

mass(\(CO_2\)) = n(\(CO_2\)) * molar mass(\(CO_2\) = 3.38 moles * 44.01 g/mol ≈ 148.59 grams

Therefore, approximately 148.59 grams of carbon dioxide could be made.

As for the remaining reactant, since \(O_2\)s the limiting reactant, all the CO will not be completely consumed. To determine the amount of CO leftover, we subtract the moles of CO used from the initial moles of CO:

Remaining moles of CO = Initial moles of CO - Moles of CO used

Remaining moles of CO = 3.36 moles - 2 * 1.69 moles ≈ 0 moles

Thus, there would be no CO leftover as it is completely consumed in the reaction.

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The atom that contains exactly two unpaired electrons is option (A) S.

The atom that contains only one electron in the highest occupied energy sublevel is Ga. option (B).

The electronic configuration of sulfur is 1s2 2s2 2p6 3s2 3p4. The p subshell can accommodate a maximum of 6 electrons but here it holds 4 electrons which means that sulfur has 2 unpaired electrons. both located in the p-subshell. Sulfur will have a pair of electrons in the 1st 3p orbital, 1 electron in the 2nd 3p orbital and 1 electron in the 3rd 3p orbital.

Gallium is a alkali metal. The highest occupied energy sub-level is defined as number of electrons present in the outermost energy level of an atom. for alkali metals general electronic configuration is nS1. This means that in the highest occupied energy sub-level of an alkali metal there will be only one electron. so Ga has only one electron in the highest occupied energy sub level.

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A. Sucrose (aq) + H₂O(l) ⇌ Glucose (aq) + Fructose (aq) (k = 1.4 × 10⁵)

B. NH₃ (aq) + H₂O(l) ⇌ NH⁴⁺(aq) + OH⁻(aq) (k = 1.6 × 10⁻¹⁵)

C. Fe₂O₃(s) + 3 CO(g) ⇌ 2 Fe(s) + 3 CO₂(g) (k at 727°C = 24)

A. Sucrose (aq) + H₂O(l) ⇌ Glucose (aq) + Fructose (aq) (k = 1.4 × 10⁵)

The high value of the equilibrium constant (k = 1.4 × 10⁵) indicates that the reaction strongly favors the products (glucose and fructose) at equilibrium. This means that at equilibrium, there will be a high concentration of glucose and fructose compared to sucrose and water.

B. NH₃ (aq) + H₂O(l) ⇌ NH₄⁺(aq) + OH⁻(aq) (k = 1.6 × 10⁻⁵)

The low value of the equilibrium constant (k = 1.6 × 10⁻⁵) indicates that the reaction favors the reactants (NH₃ and H₂O) at equilibrium. This means that at equilibrium, there will be a higher concentration of NH₃ and H₂O compared to NH₄⁺ and OH⁻.

C. Fe2O₃(s) + 3 CO(g) ⇌ 2 Fe(s) + 3 CO₂(g) (k at 727°C = 24)

The value of the equilibrium constant (k = 24) does not provide information about whether the reaction favors the reactants or products. To determine which side is favored, one would need to compare the initial concentrations or partial pressures of the reactants and products. However, the presence of the solid Fe2O₃ indicates that it is likely the reactant side (Fe2O₃ and CO) that is favored at equilibrium, as the solid does not contribute to the equilibrium expression.

Overall,

A. The reaction strongly favors the products.

B. The reaction favors the reactants.

C. The information provided is insufficient to determine which side is favored at equilibrium.

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Hope it helps