The fact that solar systems only generate electricity during the day is typically not a problem because:
-they are often located in deserts.
-they currently do not produce much electricity on a global scale.
-the electricity can be used to power Stirling engines.
-demand for electricity is often highest during the day.
-many photovoltaic cells continue to generate electricity through the night.

Magnesium (Mg) has an atomic number of 12, which means it has 12 electrons.  In the case of magnesium, it has an electron configuration of [Ne] 3s2, which means it has 2 valence electrons.

The number of valence electrons in an atom is equal to its electron configuration in the highest energy level (also called the outermost energy level). In the case of magnesium, it has an electron configuration of [Ne] 3s2, which means it has 2 valence electrons. Valence electrons are the outermost electrons of an atom that are involved in chemical reactions and bonding with other atoms. They are the electrons in the highest energy level of an atom and determine its chemical reactivity and behavior. The number of valence electrons in an atom can be determined by its electron configuration and the periodic table, and is used to predict its chemical properties, such as its tendency to form bonds with other atoms and its reactivity with other chemicals.

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AA, EDTA, and TDS are all different methods used for measuring various properties of a sample. AA (Atomic Absorption Spectroscopy) is used to measure the concentration of a specific metal ion in a sample, while EDTA (Ethylenediaminetetraacetic acid) is used to determine the concentration of various metal ions present in a sample. TDS (Total Dissolved Solids) is used to measure the total concentration of dissolved solids in a sample, including both organic and inorganic substances.

Atomic Absorption Spectroscopy (AA) measures the concentration of a specific metal ion in a sample by analyzing the absorption of light at a specific wavelength. The amount of absorption is directly proportional to the concentration of the metal ion present in the sample. This method is commonly used in environmental analysis, clinical chemistry, and materials science.

Ethylenediaminetetraacetic acid (EDTA) is a chelating agent that is commonly used to determine the concentration of various metal ions present in a sample. EDTA binds to metal ions in a 1:1 stoichiometric ratio, forming a stable complex that can be easily quantified. This method is used in many applications, including water analysis, food science, and pharmaceuticals.

Total Dissolved Solids (TDS) is a measure of the total concentration of dissolved solids in a sample, including both organic and inorganic substances. This method is commonly used in water quality analysis to determine the overall quality of a water source. TDS measurements can also be used to monitor industrial processes, such as in the production of food and beverages.

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Answer:

There are 2.34×1023 atoms C 2.34 × 10 23 a t o m s C in 5.72 g of propane. To determine the number of carbon atoms in 5.72 grams of propane we.

Explanation:

Answer:

C

Explanation:

Cellular respiration is the metabolic process and is a reduction-oxidation reaction that yields ATP molecules. Thus, option C is accurate.

It is a redox reaction that utilizes glucose and oxygen molecules to release carbon dioxide and energy in the form of ATP. This energy released is used to drive the functions and roles of the cells.

The food molecule, glucose is broken in the presence of the oxygen molecule to release the carbon dioxide and the energy from the cells that are in the form of adenosine triphosphate molecule.  

Therefore, option C. cellular respiration is a redox reaction is correct.

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Answer: Most are solid at room temperature (25 degrees Celsius) except mercury

Explanation:

The temperatures that describes the value of B is A, 0 °C, because it is the melting point of ice.

The graph shows that the temperature of the ice is increasing as it is heated. The point at which the line changes from solid to liquid is the melting point of ice. This is the temperature at which the ice changes its phase from solid to liquid. The melting point of ice is 0 °C.

The other options are incorrect. The boiling point of water is 100 °C, and the temperature at which water evaporates is also 100 °C. The temperature at point A is greater than 0 °C, but it is not greater than 100 °C.

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The atoms of various elements on the periodic table have different numbers of protons.

However, the atomic number of an element is equal to the number of protons it contains in the nucleus.

1. The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains.

2. If an oxygen atom with 8 electrons, 8 protons, and 9 neutrons, this means that there are 8 protons in the nucleus, the atomic number is equal to the number of protons.

Therefore the atomic number for an element oxygen with 8 protons is 8.

3. The element in the periodic table with 7 protons, 7 neutrons, and 5 electrons is nitrogen

4. The atomic composition of carbon-14 reveals that carbon-14 contains 6 protons and 8 neutrons.

An atom can be defined as the smallest particle of an element which can take part in a chemical reaction.

So therefore, the atoms of elements on the periodic table of elements have different numbers of protons.

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Answer:

78% nitrogen, 21% oxygen and about 1 percent argon

Explanation:

Answer:

there should be around 41 moles

Answer: 39.99711 moles

Answer: lithosphere

Explanation:

continents are a part of lithosphere.

core is a structure of earth

(a) The molar mass of Li2CO3 can be calculated by adding the atomic masses of 2 Li atoms, 1 C atom, and 3 O atoms:

Molar mass of Li2CO3 = 2(6.941 g/mol) + 1(12.011 g/mol) + 3(15.999 g/mol) = 73.89 g/mol

Therefore, the molar mass of Li2CO3 is 73.89 g/mol.

(b) The molar mass of KNO3 can be calculated by adding the atomic masses of 1 K atom, 1 N atom, and 3 O atoms:

Molar mass of KNO3 = 1(39.0983 g/mol) + 1(14.0067 g/mol) + 3(15.999 g/mol) = 101.103 g/mol

Therefore, the molar mass of KNO3 is 101.103 g/mol.

(c) The molar mass of Mg3N2 can be calculated by adding the atomic masses of 3 Mg atoms and 2 N atoms:

Molar mass of Mg3N2 = 3(24.305 g/mol) + 2(14.007 g/mol) = 100.949 g/mol

Therefore, the molar mass of Mg3N2 is 100.949 g/mol.

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Answer:

salt and hydrogen gas

Explanation:

acid + metal = salt + hydrogen

Answer:

hope this helps

Explanation:

hydrogen gas

An acid will react with a metal to form a salt and hydrogen gas. The general word equation for the reaction between an acid and a metal is as follows: acid + metal → salt + hydrogen.

Explanation:

Carbon that is a part of rocks and fossil fuels like oil, coal, and natural gas may be held away from the rest of the carbon cycle for a long time. These changes add more greenhouse gases in our atmosphere and this causes climate change.

Answer:

1.058337 grams of hydrogen and 2H2 + O2 ==> 2H2O hydrogen peroxide

mols H2 = grams/molar mass

Using the coefficients in the balanced equation, convert mols H2 to mols O2.

Now convert mols O2 to grams. That's grams mols O2 x molar mass O2.

and it could also produce H2O water but no air but it could make other things

i) you would need 60 mL of the 50X TAE Buffer stock. ii)You would need 2940 mL of distilled water (dH2O) to make up the 1X TAE Buffer to a total volume of 3 liters.

To dilute the 50X TAE Buffer to a 1X working solution for a total volume of 3 liters, you would use the following calculations:

(i) 1X TAE Buffer - stock:

For a 1X TAE Buffer, the dilution factor is 50X. Since you want to prepare a total volume of 3 liters, the volume of the stock solution needed can be calculated as follows:

Volume of 50X TAE Buffer stock = (Final volume / Dilution factor)

                              = (3 L / 50)

                              = 0.06 L or 60 mL

Therefore, you would need 60 mL of the 50X TAE Buffer stock.

(ii) 1X TAE Buffer - dH2O: To make up the remaining volume with distilled water (dH2O), subtract the volume of the stock solution from the final volume:

Volume of dH2O = (Final volume - Volume of 50X TAE Buffer stock)

             = (3 L - 0.06 L)

             = 2.94 L or 2940 mL

Therefore, you would need 2940 mL of distilled water (dH2O) to make up the 1X TAE Buffer to a total volume of 3 liters.

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Answer:

B.

Solution given:

specific heat capacity of water [c]4.186 J/g °C

temperature[∆T]=?

mass[m]=3g

heat[Q]=8000J

we have

Q=mc∆T

8000=3*4.186*∆T

∆T=8000/12.558

∆T=637.04°C.

the temperature change is 637.04°C.

A compound is a substance made up of two or more elements that have chemically joined and can only be broken down chemically into simpler compounds. For instance, pure water is a compound.

Matter with a definite composition and set of characteristics is referred to as a substance. A substance is every pure element. It is a material when it is pure. Substance examples: Because iron is an element, it's also a substance. Methane is both a material and a compound.

There are two different types of pure substances: elements and compounds. One particular type of atom makes up each element, whether it exists on its own or as part of a molecule. Compounds are molecules made up of two simpler things than molecules.

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Answer:

Sodium reacts with the oxygen in air. It reacts vigorously with oxygen and the moisture that is already present in the air and thus catches fire.

It would be a bad idea to make coins made of sodium metal, beacause of their reactive nature.

Those species which are not stable in nature and always ready to show reaction with another species, is known as reactive species.

Sodium metal is highly reactive in nature, means it easly reacts with the atmospheric oxygen and shows oxidation or with the moisture content of atmosphere as a result of which vigorously catches fire. That's why we don't use sodium to make coin.

Hence, beacause of reactive nature sodium is not used.

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Iron has a higher atomic packing factor (APF) for its body-centered cubic (BCC) structure compared to chromium.

The APF is a measure of how efficiently atoms are arranged in a crystal lattice. It is calculated by dividing the total volume of atoms in a unit cell by the volume of the unit cell itself. In a BCC structure, there are two atoms per unit cell.

In the case of iron, even though its atomic weight is higher than chromium, its atomic radius is smaller. The smaller atomic radius allows iron atoms to pack more closely together in the BCC lattice. As a result, the volume occupied by iron atoms in the unit cell is larger compared to chromium.

The BCC structure consists of a cube with an atom at each corner and one atom at the center of the cube. The coordination number, which is the number of atoms touching a central atom, is 8 in a BCC structure. The efficient packing in the BCC lattice allows for a higher number of atoms to be in contact with each other, resulting in a higher APF.

Therefore, iron, with its smaller atomic radius and efficient packing in the BCC structure, has a higher APF compared to chromium.

The atomic packing factor (APF) is a key parameter used to describe the efficiency of atom packing in a crystal lattice. It represents the fraction of space within a unit cell that is occupied by atoms. The APF is calculated by dividing the volume of atoms in the unit cell by the total volume of the unit cell. In the case of a body-centered cubic (BCC) structure, there are two atoms per unit cell.

In the given question, it is mentioned that iron and chromium have BCC structures at room temperature. While iron has a higher atomic weight than chromium, its atomic radius is smaller. The atomic radius refers to the distance from the nucleus to the outermost electron shell of an atom.

When comparing iron and chromium in terms of their BCC structures, the smaller atomic radius of iron allows its atoms to pack more closely together in the crystal lattice. As a result, the volume occupied by iron atoms within the unit cell is larger compared to chromium. This efficient packing leads to a higher APF for iron in its BCC structure.

In summary, despite having a higher atomic weight, iron's smaller atomic radius enables it to achieve a higher APF in its BCC structure compared to chromium.

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The Combustion is the the limiting reactant.

What is combustion ?

The generation of heat and light in the form of flame together with a chemical reaction that often entails the presence of oxygen. When a substance interacts with oxygen, a chemical reaction known as combustion occurs that generates heat. Among them are ethane, wood, and propane. The word for these compounds is exhaust. The majority of the exhaust is produced by chemical processes involving fuel and oxygen.

What is reaction ?

In a chemical reaction, one or more chemicals change into one or more other substances. For instance, the reaction between iron and oxygen results in rust. Sodium acetate, carbon dioxide, and water are the end products of the reaction between vinegar and baking soda.

Therefore, the Combustion is the the limiting reactant.

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The heat of reaction (ΔH) for the given reaction is 180.4 kJ/mol. To calculate the heat of reaction (ΔH) for the given reaction:

CCl₄(g) + H₂O(g) -> CHCl₃(g) + HCl(g)

You would need the standard enthalpies of formation for each compound involved in the reaction. The standard enthalpy of formation (ΔHf) is the enthalpy change when one mole of a compound is formed from its elements in their standard states.

Here are the standard enthalpies of formation for the compounds involved:

ΔHf[CCl₄(g)] = -135.5 kJ/mol

ΔHf[H₂O(g)] = -241.8 kJ/mol

ΔHf[CHCl₃(g)] = -104.7 kJ/mol

ΔHf[HCl(g)] = -92.3 kJ/mol

To calculate ΔH for the reaction, you need to sum up the enthalpies of formation of the products and subtract the sum of the enthalpies of formation of the reactants:

ΔH = ΣΔHf(products) - ΣΔHf(reactants)

ΔH = [ΔHf[CHCl₃(g)] + ΔHf[HCl(g)]] - [ΔHf[CCl₄(g)] + ΔHf[H₂O(g)]]

ΔH = [(-104.7 kJ/mol) + (-92.3 kJ/mol)] - [(-135.5 kJ/mol) + (-241.8 kJ/mol)]

ΔH = -196.9 kJ/mol - (-377.3 kJ/mol)

ΔH = 180.4 kJ/mol

Therefore, the heat of reaction (ΔH) for the given reaction is 180.4 kJ/mol.

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Answer:

D

Explanation:

because they need it and hii

Answer: Apple

Explanation:
just took the test

Answer:

There is nothing attached to this question so I unfortunately cannot help you

Explanation:

Answer:

the youngest crust of the ocean floor can be found near the seafloor

Answer:

since you only need 11 grams of propane to produce 36 grams of water you can divide 273.6 by 36. This gives us 7.6 which would be our "unit rate". We can then multiply 7.6 by 11 grams, which gives us 83.6.

So the answer is 83.6 moles of propane.

I hope this answers your question(s). Have a good weekend!

Answer:

False

Explanation:

Let's break down the equation PV=nRT.

P=Pressure

V= Volume

n= number of mole

R= the universal constant

T= Temperature

The = sign is the barrier between them. Whenever one side of the equation increases, something on the other side is directly impacted. When Temperature increases, so will pressure--and vise versa.

Credit: https://climate.nasa.gov/causes/

The industrial activities that our modern civilization depends upon have raised atmospheric carbon dioxide levels from 280 parts per million to about 417 parts per million in the last 151 years. The panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in Earth's temperatures over the past 50-plus years.

The panel's full Summary for Policymakers report is online at https://www.ipcc.ch/site/assets/uploads/2018/02/ipcc_wg3_ar5_summary-for-policymakers.pdf.