Describe two ways to add heat to liquid water.

Answer:

91.49 grams

Explanation:

No of molecules = no of moles × Avogadro's number

No of moles = No of molecules / Avogadro's number

Number of moles = 5.4×10^23/6.02×10^23

Number of moles = 0.897 moles of Al2O3

Number of moles = mass in gram / molar mass

Mass in gram = number of moles× molar mass

Mass in gram = 0.897× 102

91.49 grams

Answer:

invalid

Explanation:

Just imagine doing this experiment MULTIPLE TIMES and one of the trials you get 72 Kcal while in another u get 12kcal. It doesn't make sense. Somewhere in the experiment she went wrong. So its invalid

Answer:

\(\boxed {\boxed {\sf Option: B }}\)

Explanation:

The excess reactant is the reactant left over after a chemical reaction. It is found when the limiting reactant is completely done. The answer to your question is option B. The excess reactant is what is found after the reaction is complete. Our answer is Option B.

Answer:B

Explanation: Excess Reactant - The reactant in a chemical reaction that remains when a reaction stops when the limiting reactant is completely consumed consumed. The excess reactant remains because there is nothing with which it can react.

According to chemical equilibrium, \(\frac{d[I_2]}{dt}\) and \(\frac{d[NO]}{dt}\) is  the expressions for the rates of appearance of I₂ and NO respectively.

Chemical equilibrium is the state that develops during a reversible chemical reaction when there is no net change in the ratio of reactants to products. When a chemical reaction is reversible, the products immediately after they are generated combine to form the reactants once more. There is no net change in the quantity of the chemicals involved in the chemical reaction when the two opposing processes are in equilibrium and happening at equal rates. When the reaction is in equilibrium, it is deemed finished. The quantitative formulation identifies the conditions needed for equilibrium. Changes in concentration, changes in pressure and temperature, and the presence of a catalyst are all factors that influence chemical equilibrium.

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Answer:

22.715 moles of oxygen are used

Explanation:

Given data:

Number of moles of ethane = 6.49 mol

Number of moles of O₂ required = ?

Solution:

Chemical equation:

2C₂H₆ + 7O₂       →     4CO₂ + 6H₂O

Now we will compare the moles of oxygen with ethane.

                    C₂H₆           :           O₂  

                       2              :             7

                     6.49           :           7/2×6.49 = 22.715 mol

Thus, 22.715 moles of oxygen are used.

An eruption from a volcano can cause massive flows of basalt, a common kind of volcanic rock.

Due to the low viscosity of molten basalt lava (between 45% and 52%) and its low silica concentration, lava flows can spread over large areas quickly before cooling and solidifying.

One of the world's largest volcanic provinces is the flood basalt province known as the Deccan Traps, which is situated on the Deccan Plateau in west-central India. The Deccan Plateau, which spans about 500 000 km2, is made up of a series of flat-lying basalt lava flows that are more than 2000 m thick.

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Five causes of global warming are: 1. Burning of Fossil Fuels, 2. Deforestation, 3. Industrial Processes, 4. Fertilizers, 5. Transportation.

These can be explained further:

1. Burning of Fossil Fuels: The burning of fossil fuels such as coal, oil, and natural gas releases large amounts of carbon dioxide into the atmosphere, contributing to the greenhouse effect and causing global warming.

2. Deforestation: Forests absorb carbon dioxide from the atmosphere, but deforestation releases that stored carbon back into the atmosphere. This makes deforestation a significant contributor to global warming.

3. Industrial Processes: Industrial processes such as cement production, steel making, and chemical manufacturing release large amounts of carbon dioxide and other greenhouse gases into the atmosphere, contributing to global warming.

4. Fertilizers: Agriculture is responsible for around 14% of global greenhouse gas emissions. The use of fertilizers, livestock, and transportation all contribute to the emission of greenhouse gases.

5. Transportation: The burning of gasoline and diesel in vehicles releases large amounts of carbon dioxide and other greenhouse gases into the atmosphere. The growth of the transportation sector and the increase in the number of cars on the road is a significant contributor to global warming.

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The substances can only be properly identified if we carry out flame tests and qualitative analysis on the samples.

We know that the only way that we can be able to identify a substances in chemistry is to be able to perform a series of tests on the substances. In this case, we are told that we have the substances potassium carbonate, potassium chloride, potassium iodide, sodium chloride in solution.

We can only be able to identify the solutions by the use of flame tests and qualitative analysis. Flame test would show the colors that are characters of the cation while we could use qualitative analysis to identity the anion present.

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Chemical reactions produce compounds with entirely distinct features.

For instance, it is well known that two molecules of the gas hydrogen and one molecule of the gas oxygen combine to generate two molecules of the gas water. Chemically, this reaction can be described by the equation 2Hydrogen + Oxygen 2Water.

The creation of water is an illustration of a synthesis reaction (Water). When hydrogen gas and oxygen gas interact, this process takes place. Water that is in liquid form is the end outcome. A chemical equation is displayed.

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Question:

Liquid water (H₂O) is formed when two gases, hydrogen (H₂) and oxygen (O₂), react. Why are the properties of water different than those of the reactant gases?

A. When substances chemically combine, products with completely different properties form.

B. Water is a liquid, while hydrogen and oxygen are gases.

C. Water has a lower density than hydrogen and oxygen.

D. Water has a higher boiling point than hydrogen and oxygen.

Answer:

oxygen . 1 percent and 4 percent the are the awnsers

The element most abundant in Earth’s crust is oxygen. The percentage of titanium in the earth's crust is 1%.

The abundance of the elements is a measurement of the occurrence of one particular chemical element relative to all other elements in our environment.

The nine most abundant elements in the Earth's crust: oxygen(O) 46%, silicon (Si) 28%, aluminum (Al) 8.3%, iron (Fe) 5.6%, calcium (Ca) 4.2%, sodium (Na) 2.5%, magnesium (Mg) 2.4%, potassium (K) 2.0%, Other elements occur less than 0.15%.

The most abundant chemical element in the earth’s crust is oxygen (46%). The abundance of hydrogen is only 0.14%(percent by mass) in the earth’s crust which is the 10th most abundant element on the earth.

From the given graph, oxygen is the most abundant element in the earth's crust and the percentage of the abundance of titanium is 1% and calcium is 4%.

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Early geologists identified four features while examining sedimentary rock layers: strata or layering, fossils, angular unconformities, and cross-bedding.

Rock fragments from other types of existing rocks or organic substance are used to create sedimentary rocks. Clastic, organic (biological), and chemical sedimentary rocks are the three distinct types of sedimentary rocks. Sandstone is a type of clast sedimentary rock, which is formed from fragments of other minerals.

Igneous rock includes granite. Material is deposited, weathered, and other mechanisms that cause organic or mineral particles to settle down and collect result in the formation of sedimentary rock. All varieties of marble, as well as volcanic rocks like travertine and onyx, contain fossils.

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Answer:

the air pressure decreases

explanation

as altitude increases air pressure decreases the surface of the Earth is bottom of the ocean of the are the layer on top increase pressure so that sea levels a body is under 14.7 pounds of pressure per square inch moving up in altitude decreases weight of the air that causes the pressure

Answer: It decreases.

Explanation: As altitude rises, air pressure drops. In other words, if the indicated altitude is high, the air pressure is low.

Answer:

c

Explanation:

Tetraphosphorus trisulfide is the correct name for \(P_4S_3\). Hence, option C is correct.

IUPAC nomenclature is based on naming a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring.

Tetraphosphorus trisulfide is the correct name for \(P_4S_3\).

Hence, option C is correct.

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The microscopic interface asymmetry of grown semiconductor heterostructures.

The dispersion of restricted electrons. beginning from a multiband envelope formulation we practice matrix perturbation theory to derive specific expressions. Interface asymmetry, which in the conduction band Hamiltonian appear as a warping and a spin-splitting term. The warping term consequences in an inequivalence of the dispersion.

The microscopic interface asymmetry of grown semiconductor heterostructures that gives upward thrust to heavy-light hole coupling even at 0 in-plane wave vector, modifies also the dispersion of restricted electrons. beginning from a multiband envelope method we practice matrix perturbation principle to derive explicit expressions as a result of this interface asymmetry, which inside the conduction band.

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Answer:

40. B

41. B

Explanation:

Copper is a good insulator and conducts electricity.

Answer:

potassium (K) and fluorine (F)

Explanation:

Potassium is an alkali metal just like sodium and fluorine is a halogen just like chlorine. A metal and nonmetal will often join to form an ionic compound.

Aluminum, if it was going to bond to itself, would be a metallic bond.

Sulfur and oxygen are both nonmetals and would form a covalent bond.

Calcium would not bond with neon as neon is a noble gas.

Answer:

A) potassium (K) and fluorine (F)

Explanation:

got it right on time for learning :)

Answer:

mabye C at least if its not right sorry .

33.33 mL much liquid was delivered from the buret. Hence, the correct option is A.

The volume of liquid delivered from the buret can be calculated as the difference between the final and initial readings:

Volume delivered = final reading - initial reading

Volume delivered = 34.56 mL - 1.23 mL

Volume delivered = 33.33 mL

A buret is a laboratory apparatus used to dispense and measure volumes of liquid with high accuracy and precision. It is commonly used in titration experiments where a measured volume of a solution of known concentration is added to a solution of unknown concentration until the reaction reaches completion.

Hence, the correct option is A.

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Answer:

C

Explanation:

I hypothesis needs to be tested to know whether it is true or not. Here is the definition:

A supposition or proposed explanation made on the basis of *limited evidence as a started point for further investigation*

Answer:

Explanation:

Any factor that increases the Collison rate definitely increase the rate of reaction, concentration, temperature, surface area, pressure and catalyst are the major factor that affect the rate of reaction.

The rate of reaction is the study of change of concentration of reactant or product with respect to time.

There are so many factors that affect the rate of reaction

1)concentration: As the concentration of reactant increases the number of collisions increases so rate of reaction also increases.

2)temperature: As the temperature increases the movement of gaseous molecule increases hence the Collison rate increases and hence the rate.

3)surface area (for solid reactants ONLY): As the surface area of the catalyst increases, more molecule can sit on the reactive site hence more is the rate of reaction.

4)pressure (for gaseous reactants ONLY): As pressure increases the randomness increases and hence the Collison and hence the rate of reaction

5)catalyst: Catalyst increase the rate of reaction as they decrease the activation energy

Thus concentration, temperature, surface area ,pressure and catalyst are the factor that increases rate of reaction

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Answer:

The reaction you are referring to is:

Mg + 2AgNO3 → Mg(NO3)2 + 2Ag

0.960 moles of silver will be produced

Explanation:

The balanced equation shows that 1 mole of Mg reacts with 2 moles of AgNO3 to produce 2 moles of Ag.

If we start with 0.480 moles of Mg, then we will produce 0.480 * 2 / 1 = 0.960 moles of Ag.

Here is the calculation:

Number of moles of Ag produced = (Number of moles of Mg) * (Moles of Ag produced per mole of Mg)

= 0.480 moles * 2 moles/mole

= 0.960 moles

Therefore, 0.960 moles of silver will be produced if the reaction starts with 0.480 moles of Mg.

Iron produced in a blast furnace is harder than pure iron due to the presence of impurities and the way it is produced.

In a blast furnace, iron ore is reduced to iron using coke as a reducing agent and a source of carbon. The high temperatures involved in this process result in the formation of a cast iron product that contains carbon and other impurities in the form of carbides and other compounds.

The presence of carbon and other impurities in the iron makes it harder and stronger than pure iron, which is relatively soft and ductile. The carbides formed during the reduction process act as tiny cutting edges, strengthening the iron and increasing its hardness.

This hardened iron is then melted and poured into molds to form pig iron, which can then be further processed to remove impurities and refine its properties. The end result is a stronger and harder iron product that is better suited for various applications, such as construction or manufacturing.

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Answer:

ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Explanation:

Answer:

like a element is like water

Answer:

periodic table

In the given diagram,  the first atom contains one valence electron and the second have 7 valence electrons. The first atom donates the one electron to the second atom and both achieve octet and forms and ionic compound.

Ionic compounds are formed between a metal and non-metal. Metals are rich in electrons and easily loss one or more electrons to other atoms. Non-metals are electron deficient and can gain electron from metals. These electron loss and gain between atoms forms the ionic bond between them.

In the diagram the first atom contains total 11 electron of which one is valence electron. By donating this extra electron the atom can achieve octet. The second one contains total 17 electrons  of which  7 are valence electrons, thus need one more electron to attain octet.

The first atom represents sodium atom and the second one is chlorine atom. Sodium donates its valence electron to Cl and form the ionic compound NaCl.

Na⁺ + Cl⁻ ⇒ NaCl

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a) The amount of K for this reaction at 25°C is 3.95 x 10¹⁴.

b) The standard free energy change for the reaction is positive (ΔG° > 0), indicating that the reaction is non-spontaneous under standard conditions.

The standard free energy change for the reaction can be calculated using the following equation:

ΔG° = ΔH° - TΔS°

where ΔH° is the standard enthalpy change, ΔS° is the standard entropy change, and T is the temperature in Kelvin.

We can find the standard enthalpy and entropy changes for the reaction from standard formation data:

ΔH°f(N2) = 0 kJ/mol

ΔH°f(O2) = 0 kJ/mol

ΔH°f(NO) = 91.8 kJ/mol

ΔS°f(N2) = 191.6 J/(mol K)

ΔS°f(O2) = 205.0 J/(mol K)

ΔS°f(NO) = 210.0 J/(mol K)

Using these values, we can calculate the standard free energy change:

ΔG° = (2 ΔG°f(NO)) - (ΔG°f(N2) + ΔG°f(O2))

ΔG° = (2 x 91.8 kJ/mol) - (0 kJ/mol + 0 kJ/mol)

ΔG° = 183.6 kJ/mol

We can also calculate the equilibrium constant (K) for the reaction using the standard free energy change:

ΔG° = -RTlnK

K = e^(-ΔG°/RT)

At 25°C (298 K), we have:

K = e^(-183600 J/mol / (8.314 J/(mol K) x 298 K))

K = 3.95 x 10¹⁴

However, the actual free energy change for the reaction will depend on the concentrations of N2, O2, and NO present. If the concentrations are such that the actual free energy change is negative (ΔG < 0), the reaction can be spontaneous under those conditions.

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