What is formed during a chemical reaction when electrons are lost and gained?

A piece of iron (mass = 25.00 g) at 398.0 K is placed in a styrofoam coffee cup containing 25.00 mL of water at 298.0 K. Assumin

Cloud [144]

Answer:

The final temperature of the water is 36,93°C

Explanation:

When iron comes into contact with water, it gives it heat to increase its temperature. The heat that the iron yields to match the water temperature is.

Q = m . C . ΔT

Q = 25 g . 0,4990 J/g°C (298K - 398K)

Q = 25 g . 0,4990 J/g°C - 100°C = -1247,5 J

Kelvin or Celsius is the same, because ultimately the formula only takes the result of a subtraction

This is the heat (-1247,5 J) that water wins to increase its temperature. As in iron it is a detached heat, the result was negative, however, for water it is a gained heat, that's why it is positive.

1247,5 J = 25g . 4,180 J/g°C (Tfinal - 25°C)

For units, it's more confortable to work in Celsius.

1247,5 J / (25g . 4,180 J/g°C) = Tfinal - 25°C

11,93°C = Tfinal - 25°C

11,93°C + 25°C = Tfinal = 36,93 °C

It is reasonable that the water has increased its temperature because the iron temperature was 100 degrees higher, before both substances came into contact

5 0

3 years ago

How many grams of NaOH are required to neutralize 700 mL of 3.0 M HCl?

sveta [45]

A gram of NaOH required to neutralize 700 ml HCL is 84 grams.

Neutralization or neutralization is a chemical response in which an acid and a base react quantitatively with each different. I

Moles of solute = Molarity × Liters of solution

= 3 × 0.7 L

= 2.1 mole

The molar mass of NaOH = 40

mass of NaOH = 40 × 2.1 g

= 84 gram.

A neutralization response may be described as a chemical reaction in which an acid and base quantitatively react together to shape salt and water as products. In a neutralization response, there's a combination of H+ ions and OH– ions that form water.

A neutralization response is when an acid and a base react to shape water and salt and includes the mixture of H+ ions and OH- ions to generate water. The neutralization of a sturdy acid and robust base has a pH equal to 7.

Learn more about neutralization here:-brainly.com/question/23008798

#SPJ1

5 0

1 year ago

A student finds a piece of metal that she thinks is aluminum. She finds the volume to be 245 cm^3 and the mass to be 612 grams.

natta225 [31]

Answer:

Density = 2.5 g/cm³ , The metal is aluminium.

Explanation:

Density is defined as the ratio of the mass and the volume

Thus,

$Density=\frac {Mass}{Volume}$

Given that:

Mass = 612 grams

Volume = 245 cm³

Thus, Density is:

$Density=\frac {612}{245}\ g/cm^3$

Density = 2.5 g/cm³

Metals are shiny with high density.

The density of aluminium falls is approx 2.6 g/cm³ and not other metal's density falls in this range.

The metal is aluminium.

3 0

4 years ago

Which of the following can explain the daily change in sea level observed along a coast?

Paul [167]

The answer is: A.The gravitational pull of the moon on the water near the coast

4 0

3 years ago

Which of the follow statements about isotopes is NOT correct?

worty [1.4K]

Answer: B- Isotopes are often used for dating artifacts and fossils is incorrect.

Explanation: I hope that helped

8 0

3 years ago