CHEMISTRY HIGH SCHOOL

Given the reaction:Mg(s) + 2 AgNO3(aq)--> Mg(NO3)2(aq) + 2 Ag(s)
Which type of reaction is represented?
(1) single replacement (3) synthesis
(2) double replacement (4) decomposition

Answers

Answer 1
Answer:

Answer: (1) single replacement

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.Thus magnesium can easily lose electrons as compared to silver and result in the formation of magnesium nitrate and silver.

Mg(s)+2AgNO_3(aq)\rightarrow Mg(NO_3)_2(aq)+2Ag(s)

Double displacement is a chemical reaction in which ion exchange takes place.

Synthesis reaction is a chemical reaction in which two reactants combine to give a single product.

Decomposition is a chemical reaction in which one substance decompose to give two or more than two products.
Answer 2
Answer: reaction: Mg(s) + 2 AgNO3(aq) → Mg(NO3)2(aq) + 2 Ag(s)
Which type of reaction is represented?

double replacement



double replacement a bimolecular process involving the exchange of bonds between the two reacting chemical species, which
results in the creation of products with
similar or identical bonding affiliations.
To illustrate, consider two chemical species, AB and CD, which react to give AD and CB:

AB + CD → AD + CB

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Calculate how much gasoline and money could be saved if the automobile's fuel efficiency were increased by 25%.Gasoline = 25 gallons per week
Money = $2 per gallon ($50 total)

Answers

In the question it is already given the amount of actual gasoline and money consumed before the fuel efficiency gets increased by 25%
Gasoline consumption before the increase in fuel efficiency = 25 gallons per week
Gasoline saved after the increase in fuel efficiency = [25 * (25/100)] gallons per week
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So every week 6.25 gallons of gasoline can be saved after increasing the efficiency of the automobile by 25%.
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The amount of money saved against the 6.25 gallons of gasoline saved = (6.25 * 2) dollars
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How many atoms are in 0.05 moles of xenon gas at STP?2.2 x 10^23

3.0 x 10^22

6.0 x 10^23

3.0 x 10^24

Answers

Answer: Option (b) is the correct answer.

Explanation:

According to the mole concept there are 6.022 * 10^(23) atoms present in 1 mole of a substance.

Mathematically,    1 mole = 6.022 * 10^(23) atoms or molecules

Therefore, number of atoms present in 0.05 moles of xenon are as follows.

                 0.05 * 6.022 * 10^(23)

                   = 0.3011 * 10^(23) atoms

or,                = 3.0 * 10^(22) atoms

Thus, we can conclude that there are 3.0 * 10^(22) atoms present in 0.05 moles of xenon gas at STP.
To convert moles to atoms, multiply moles by Avogadro's number:
(0.05mol Xe)(6.02x10^23 atoms) = 3.0x10^22 atoms Xe

A sample of sulfur has a mass of 232 grams. How many moles of sulfur are in the sample?

Answers

Answer : The number of moles of sulfur present in sample are, 7.343 moles

Solution : Given,

Mass of sulfur = 232 gram

Molar mass of sulfur = 32 g/mole

Formula used :

\text{Moles}=\frac{\text{Given mass}}{\text{Molar mass}}

\text{Moles of Sulfur}=\frac{\text{Mass of Sulfur}}{\text{Molar mass of Sulfur}}=(232g)/(32g/mole)=7.343moles

Therefore, the number of moles of sulfur present in sample are, 7.343 moles
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Sarah is testing how quickly saltwater freezes. She adds saltwater to one ice tray and plain water to another ice tray. She places each tray in the freezer and records the time when each one starts to freeze. What treament did she do?. . A.Salt. B.Water. C.Freezer. D.Ice tray

Answers

The correct answer is A. Salt

That is because all of the conditions and the ingredients are the same. The one thing that makes the difference is the salt, which if removed, would cause everything to be the same. If she knows at how much regular water freezes, she can easily see how salt impacted the difference.

Answer:

salt

Explanation:

If a pH of water is 5.3 then 4.3 is it 1.0 less acidic 1.0 less basic

Answers

The pH of water is 7
5.3 to 4.3 is more acidic. 1 pH is more acidic than 2 pH The base starts at 8.
It would be 1.0 less basic, 1.0 more acidic

approximately how many grams of sodium chloride (NaCl) are required to prepare 500. mL of 3.00 M solution

Answers

First convert mL to L:
(500. mL)/(1000L) = .500L

Then convert molarity to moles:
(3.00M)(.500L) = 1.5mol NaCl

Then convert moles of NaCl to grams of NaCl by multiplying it by its molar mass:
(1.5mol NaCl)(58.44g/mol NaCl) = 87.66g NaCl are needed
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