****I RLY NEED HELP RN!!! ITS CHEMISTRY AND I AM SOOOO LOST. CAN SOMEONE PLZ PLZ PLZ HELP A GIRL OUT??? I WILL MARK BRAINLIEST, ETC!!!!!
Balance the following chemical equations:

1) AgNO3 + KCl AgCl + KNO3

2) H2O + SO3 H2SO4

3) KI + Cl2 KCl + I2

4) NaHCO3 Na2CO3 + H2O + CO2

5) Zn + HCl ZnCl2 + H2

6) BaCl2 + Na2SO4 BaSO4 + NaCl

Answer:

We in daily life use technology to pay virtually through virtual wallets, work at home, purchase packages to travel abroad, many businesses handle virtual advertising, that is why it is called the new "market window" to social networks or internet pages, university universities playful methods through virtual campuses or virtual classes.

The serious impact is very great since many of the activities of daily life change, and they will return to being as before the technology affected in our lives, reversing customs and technological generations.

The new technologies are: computer science, engineering, arquetectonica, scientific, industrial, commercial ... Where a fourth industrial revolution arises where many processes that were carried out by humans today would be automated by computers or technological devices that improve market efficiency, of consumption and industrialization.

Explanation:

In addition, new technologies are those that are based on electronic devices that are based on social communication, the development of social networks and technology based on global communications.

An engine using gasoline to power a car and mixing glue and laundry powder to create putty are both examples of chemical reactions.

Gasoline is considered an energy source due to its ability to release stored chemical energy in the form of heat and mechanical work when it is burned in an engine. When gasoline is ignited in an engine, the chemical energy stored in its molecular bonds is released, causing a rapid combustion reaction that generates heat and expanding gases that push the pistons and create mechanical work.

The energy content of gasoline is typically measured in units of joules or British thermal units (BTUs), which are used to quantify the amount of energy released during combustion. Gasoline is a widely used and important energy source, but its combustion also produces harmful emissions that contribute to air pollution and climate change.

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The null hypothesis for this experiment reaction is that there will be no significant difference in the number of fish caught using cheese as bait versus hot dogs as bait.

The independent variable in this experiment is the type of bait being used - cheese or hot dogs. The dependent variable is the number of fish caught with each type of bait. The control variable would be the location where they are fishing, the time of day they are fishing, and any other external factors that could affect the outcome of the experiment.

The dependent variable is the outcome that is measured, in this case, the number of fish caught. The control variable is a factor that remains constant throughout the experiment, in this case, the fishing location.
Hypothesis: "The type of bait (cheese or hot dog) will affect the number of fish caught."
Null Hypothesis: "The type of bait (cheese or hot dog) will have no effect on the number of fish caught."
Predicted Results: The predicted results will show whether using cheese or hot dog as bait has a significant effect on the number of fish caught, ultimately determining which bait is more effective.

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He did not meet his goal because 25% is lesser than 30% and he needs 30% or more Osvoldo's objective was not achieved.

If he had 220 grams of carbohydrates today, and 55 of those grams came from whole grains, then the proportion of his total carbohydrates that were made up of whole grains was.

It is assumed that Osvoldo aims to consume at least 30 percent of his daily grams of carbohydrates from whole grains.

He consumed 220 grams of carbohydrates today.

55 grams of whole-grain carbohydrates

We must ascertain whether Osvoldo achieved his objective or not.

We must determine if 55 is at least 30% of 220.

He only obtains 25% of his daily grams of carbohydrates from whole grains because 55 is 25% of 220.

55/220 × 100 = 25%

he has a goal of getting at least 30% percent of his grams of carbohydrates each day from whole grains, Hence, Osvoldo did not meet his goal.

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Two products are expected to form: methyl α-D-galactopyranoside and methyl β-D-galactopyranoside.

The reaction follows an S_N2 substitution mechanism. In the presence of excess methyl iodide and Ag2O, the iodide ion (I-) attacks the anomeric carbon of -D-galactopyranose, resulting in the displacement of the leaving group (OH) and formation of a new C-I bond. This step leads to the formation of two isomeric products due to the stereochemistry of the reaction.

Methyl α-D-galactopyranoside is formed when the iodide ion attacks the anomeric carbon from the opposite side of the hydroxyl group (trans configuration). This results in the methyl group and the hydroxyl group being in a cis relationship.

Methyl β-D-galactopyranoside is formed when the iodide ion attacks the anomeric carbon from the same side as the hydroxyl group (cis configuration). In this case, the methyl group and the hydroxyl group are in a trans relationship.

Overall, the chemical reaction results in the substitution of the hydroxyl group of -D-galactopyranose with a methyl group, leading to the formation of two methylated galactopyranoside isomers.

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Option (d) acetylcholine is the right answer.

Acetylcholine is the chemical compound released by the motor-neuron axon terminals.

Chemically speaking, acetylcholine is an organic chemical that is an ester of acetic acid and choline.

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Average atomic mass of X is 35.22 amu

What will be the average atomic mass?

The average atomic mass of X will be closer to 35

Let Isotope X³⁵ be A

Let Isotope X³⁷ be B

Let Isotope X³⁸ be C

According to the given question:

The average atomic mass of X can be obtained as follow:

For isotope A (X³⁵):

Mass of A = 35 amu

Abundance of A (A%) = 90%

For isotope B (X³⁷):

Mass of B = 37 amu

Abundance of B (B%) = 8%

For isotope C (X³⁸):

Mass of C = 38 amu

Abundance of C (C%) = 2%

Atomic mass of X =?

Atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100] + [(mass of C × C%)/100]

= [(35 × 90)/100] + [(37 × 8)/100] + [(38 × 2)/100]

= 31.5 + 2.96 + 0.76

Average atomic mass of X = 35.22 amu

Therefore, average atomic mass of X will be closer to 35

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The complete reaction equation, using the lowest number of coefficients possible is;  HF(aq)  +  OH^-(aq)  ----> F^-(aq) + H2O(l)

The reaction equation here shows the reaction between hydrogen fluoride and the the hydroxide ion from a base. This is a neutralization reaction as shown.

The reaction can fully be represented as;

HF(aq)  +  OH^-(aq)  ----> F^-(aq) + H2O(l)

This is the full reaction equation using the lowest number of coefficients possible in the reaction equation.

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The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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Answer:

35

Explanation:

Given parameters:

  Atomic number of zinc  = 30

  Mass number of zinc = 65

Unknown

  Number of neutrons  = ?

Solution:

The mass number of an atom is the sum of its protons and neutrons;

     Mass number  = Protons + neutrons

Atomic number is the number of protons in an atom;

   Atomic number  = Protons

So;

     Mass number  = Atomic number + Neutrons

Neutrons  = Mass number  - Atomic number

 Neutrons  = 65 - 30  = 35

The number of neutrons in the atom is 35

Answer:

B unless not up to u if u learned about two letters with the - in the middle. dont stress me

Answer:

One element takes the place of another in a compound

Explanation:

I just took a test for it and got it right. :)

Hope This Helps :)

Answer:

es la letra a)

Explanation:

síganme en insta

Investing   :

"I'm considering investing in equities."

"I need a system for handling my finances."

"I need to put money away for the future."

No Investment :

"My knowledge of investment is limited."

"I am unable to purchase stocks."

"I don't particularly enjoy taking chances."

Explanation:

These are accurate because I recently completed the course that taught me these things.

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The species oxidized in both electron-transfer reactions is Mg, while the species reduced is Co2+ in the first reaction and Pb2+ in the second reaction. The oxidizing agent in both reactions is the species that is reduced, while the reducing agent is the species that is oxidized.

In the first electron-transfer reaction, Mg is oxidized and Co2+ is reduced. Mg is the reducing agent and Co2+ is the oxidizing agent. As the reaction proceeds, Mg loses two electrons to become Mg2+ while Co2+ gains two electrons to become Co(s).
In the second electron-transfer reaction, Mg is oxidized and Pb2+ is reduced. Mg is the reducing agent and Pb2+ is the oxidizing agent. As the reaction proceeds, Mg loses two electrons to become Mg2+ while Pb2+ gains two electrons to become Pb(s).
The process of oxidation involves the loss of electrons, while reduction involves the gain of electrons. The species that loses electrons is the reducing agent, while the species that gains electrons is the oxidizing agent. In both reactions, Mg is oxidized and serves as the reducing agent, while Co2+ and Pb2+ are reduced and serve as the oxidizing agents.
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Answer:

Explanation:

Lattice energy is a way to measure the bond strength in ionic compounds. Ionic compounds tend to have high melting and boiling points. Ionic compounds tend to be hard. Ionic compounds have a range of solubilities.

Answer:

It's C.

Explanation:

According to the site, "http://needtoknow.nas.edu/energy/energy-sources/renewable-sources/wind/" ... "Wind energy is an indirect form of solar energy created by a combination of factors, including the uneven heating of Earth’s atmosphere by solar radiation, variations in topography, and the rotation of Earth. People have been putting wind energy to use throughout history to propel sail boats, mill flour from grain, and pump water."

Answer:

filtration and Chromatography

Explanation:

The first method used for separation of solids from the mixture is filtration. Filtration is used to separate different solids in a mixture which has particles of different sizes. Other method is Chromatography in which the compounds in the mixtures are separated from each other by moving the mixture at high speed. Due to high speed, the compounds are separated from each other because different compounds have different speeds so it is separated easily.

The compound that will not pass through filter paper when stirred in water is (1) Hg₂Cl₂. This is because Hg₂Cl₂ is insoluble in water and forms precipitate when stirred in water. This precipitate will not pass through filter paper and can be separated from solution.

Compound is a substance that is made up of two or more different elements that are chemically bonded together in a fixed proportions. The elements in a compound cannot be separated by physical means, but can only be separated by chemical reactions. Compounds have their own unique chemical and physical properties that are different from the elements that make them up.

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total entropy change:

S total = S hot +  S cold  = 0.0615kJ/k

which is violation of Clausius inequality of increase of entropy principle S total >= 0

What is entropy ?

Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive work. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion. Entropy theory offers profound understanding of the direction of spontaneous change for many commonplace events.

Entropy is a concept that gives mathematics a way to express the intuitive understanding of which operations are impossibly impossible even though they wouldn't go against the fundamental tenet of energy conservation.

T cold = 600k

T hot  =  950k

Q=100kj

Shot=-Q/T hot = -0.1052kJ/k

S cold=Q/Tcold = 0.1667kJ/k

total entropy change:

S total = Shot +  S cold  = 0.0615kJ/k

which is violation of Clausius inequality of increase of entropy principle S total>=0

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Answer:

An orbit is a regular, repeating path that one object in space takes around another one.

From the problem, we know that:

The half-life of the nuclide is 30 years.

The time that we're going to study are 120 years.

The first thing we need to do is to find the number of half-lives that has elapsed (n). To do this, we divide the time studied by the half life:

How to determine the original mass?

We know that the amount remaining (N) is = 4.1g and the number of half-lives (n) = 4. To find the original amount (No), what we do is to use the following equation:

The original mass of Cs-131 sample was 65.6 grams.

Answer:

C. Theories have been confirmed through tests; hypotheses haven't.

Hope this helps!!

Answer:

180g

Explanation:

So, 10 mole of water will weigh (18x10) = 180g.

Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

The size of a sample can affect the melting point measurement by either increasing or decreasing the observed melting point.

A larger sample size can lead to a broader melting range due to uneven heating, while a smaller sample size can result in a higher melting point due to surface effects.
The rate of heating can also affect the melting point measurement. A slow heating rate can result in a lower melting point due to partial decomposition, while a rapid heating rate can lead to a higher melting point due to kinetic factors.

The degree of chemical purity of a substance can affect the melting point measurement by increasing the observed melting point and narrowing the melting range. Impurities can lower the melting point and broaden the melting range due to eutectic effects.

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Answer:

El agua oxigenada se encuentra en cuatro concentraciones diferentes expresadas “en tanto por ciento”: 8%, 30%, 35% y 50%. Sin embargo, hay quien prefiere hablar de “volúmenes” y no de “porcentajes”.

The reaction of prop-2-en-1-ol with HBr in the presence of a peroxide catalyst would produce a product that exists as optical isomers.

Prop-2-en-1-ol (allyl alcohol) has a chiral center, which means that it can exist as optical isomers. To form a product that could exist as optical isomers, the reagent should react with the chiral center of the molecule, causing it to become asymmetric.

One reagent that could achieve this is hydrogen bromide (HBr) in the presence of a peroxide catalyst. This reaction, known as hydrobromination, involves the addition of HBr across the double bond of prop-2-en-1-ol to form 2-bromopropan-1-ol. The addition of HBr to the double bond creates a new chiral center, which results in the formation of two enantiomers of the product.

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To determine the number of moles of water produced in the given reaction 2C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(g), we need to compare the stoichiometric coefficients of water (H2O) with the other reactants and products. From the balanced equation, it can be concluded that 18 moles of water are produced for every 2 moles of C8H18 consumed.

The balanced equation shows that for every 2 moles of C8H18 consumed, 18 moles of H2O are produced. This ratio is obtained by comparing the stoichiometric coefficients of water and C8H18 in the balanced equation.

Therefore, if we have a known amount of C8H18 and want to determine the corresponding moles of water produced, we can use the ratio:

moles of H2O = (moles of C8H18) x (18 moles of H2O / 2 moles of C8H18)

The ratio of 18 moles of H2O to 2 moles of C8H18 indicates that for every 2 moles of C8H18, 18 moles of H2O are produced in the reaction.

Using this ratio, you can calculate the number of moles of water produced by multiplying the number of moles of C8H18 by the ratio of 18 moles of H2O to 2 moles of C8H18.

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