A student records the mass of a piece of iron. The iron is then left outside until it rusts. What type of reaction occurs, and how does the mass of the object after rusting compare with its original mass?

Answers

Answer 1

Answer: A student records the mass of a piece of iron. The iron is then left outside until it rusts. The type of reaction that occurs is oxidation reaction. The mass of the object decreases after rusting compared with its original mass.

Answer 2

Answer:

Answer:

oxidation reaction

Explanation:

Rusting is the oxidation of iron in the presence of air and moisture. Rusting in a chemical change in which iron combines with oxygen to form iron oxide. The molar mass of iron oxide is greater than iron. So the mass of an object after rusting is greater than its initial mass.

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1. Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent 40Ar and 40Ca atoms. How many years old is this rock?
The specific heat of a solution is 4.18 J/(g•°C)and its density is 1.02 g/mL. The solution is formed by combining 25.0 mL of solution A with 25.0 mL of solution B with each solution initially at 21.4°C. The final temperature of the combined solution is 25.3°C. Calculate the heat of reaction, q, assuming no heat loss due to the calorimeter. I got 831 JThe part I cannot figure out is the question afterwards which is If the calorimeter has a heat capacity of 8.20 J/°C and a correction is included to account for the heat absorbed by the calorimeter what is the heat of reaction q

A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?

Answers

Answer : The number of moles of isopropanol are 1.308 moles.

Solution : Given,

Mass of isopropanol = 78.6 g

Molar mass of isopropanol = 60.1 g/mole

Formula used :

$\text{ Number of moles}=\frac{\text{ Given mass}}{\text{ Molar mass}}$

Now put all the given values in this formula, we get the number of moles of isopropanol.

$\text{ Number of moles}=(78.6g)/(60.1g/mole)=1.308moles$

Therefore, 1.308 moles of isopropanol are contained in this sample.

The thing we are asked to calculate here is the amount of the substance in the given sample in units of moles. To obtain this value, the molar mass of the substance is needed. Molar mass has the units of grams per mole so it is a useful value for converting mass into moles.

78.6 g ( 1mol / 60.1g) = 1.31 mol isopropanol

The recipe for pumpkin pie calls for 3 tablespoons of flour and 1.5 cups of sugar for each pie. Which of the following conversion factors would be used to find out how many pies could be made from 7.5 cups of sugar.

Answers

Answer:

5 pumpkin pies could be made with 7.5 cups of sugar.

Explanation:

The conversion factor to solve the problem is:

$7.5 cups of sugar*(1 pie)/(1.5 cups of sugar) = 5 pies$

Which solution will change litmus paper red?B) CH300 (aq)A) NaOH (aq)How many milliliters 0.100 M NaoH(aq) would be needed to compofB) 50.0 mLA) 300. mL

Answers

None of the solutions will change the litmus paper to red. Normally, a litmus paper is colored blue and when acidic solution is present it will turn to red. Since the given choices are CH3OO- (Acetate Ion) and NaOH (Sodium Hydroxide) are both base.

Which is true about covalent compounds?Have a high melting point

Conduct electricity when dissolved in water

Have a low boiling point

Are extremely hard

Answers

Covalent compounds have a low boiling point. All the other answers apply to ionic compounds.

Covalent compounds have a low boiling point.

How many milliliters of 0.02 M HCl are needed to react completely with 100 mL of 0.01 M NaOH?A) 200 mL
B) 100 mL
C) 75 mL
D) 50 mL
E) 25 mL

Answers

Answer: Option (D) is the correct answer.

Explanation:

Molarity is number of moles divided by volume of the solution.

Mathematically, Molarity = $(no. of moles)/(Volume)$

Also, in the given situation number of moles of both HCl and NaOH are equal. Therefore, volume of HCl will be calculated as follows.

$M_(HCl)V_(HCl)$ = $M_(NaOH)V_(NaOH)$

$0.02 M * V_(HCl)$ = $0.01 M * 100 mL$

$V_(HCl)$ = $(0.01 M * 100mL)/(0.02)$

= 50 mL

Thus, we can conclude that volume of HCl is 50 mL.

The reaction of HCl and NaOH is HCl + NaOH = NaCl + H2O. So the mole number of HCl and NaOH is equal. So the volume of HCl =0.01*0.1/0.02=0.05 L =50 ml. So the answer is D).

In nature, rings with ____ carbon atoms are the most abundant

Answers

Answer: Five and Six

Explanation: In nature, usually we can observe the rings with 5 or 6 carbon atoms are most abundant.

First of all, the rings with 5 or 6 carbon atoms are the most stable rings which are not affected by any free energy factor or enthalpy factor or entropy factor.

Moreover 6 membered rings are found to be the most stable ones because of the extra stability provided by the term known as Aromaticity like Benzne is known to be most stable and most aromatic compound.

5 membered rings are found in our body as ribose sugar which makes the important nucleic acids which are RNA (ribose nucleic acids)and DNA(de oxyribose nucleic acids) .

In nature, rings with five to six carbon atoms are the most abundant

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