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3 years ago

Choose the statement below that correctly describes electrons.

Chemistry

1 answer:

frutty [35]3 years ago

3 0

Answer:

d. Electrons have a negative charge and are lighter than protons

Explanation:

The best statement that describes electrons is that electrons are negatively charged and are lighter than protons.

There are three known subatomic particles which are:

Protons which are the positively charged particles within an atom.
Electrons are the negatively charged particles
Neutrons do not carry any charges.

The mass of the protons and neutrons are similar.

Electrons are lighter than both protons and neutrons.

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Find the initial temperature of 45.0g of water if its final Temperature after submerging a metal with the mass of 8.5g is 22.0°C

Korolek [52]

The initial temperature of the water that resulted in the final temperature of the water-metal mixture is 20.7 ⁰C.

"Your question is not complete, it seems to be missing the following information;"

the specific heat capacity of the metal is 0.45 J/g⁰C.

The given parameters;

mass of water, $m_w$ = 45 g
final temperature of the water, $t_w$ = 22 ⁰C
mass of the metal, m = 8.5 g
initial temperature of the metal, t = 82 ⁰C.
specific heat capacity of the metal, c = 0.45 J/g⁰C.

The initial temperature of the water will be calculated by applying the principle of conservation of energy;

heat gained by water = heat lost by metal

$Q_{water} = Q_{metal}$

$m_wc_w \Delta t_w = mc\Delta t$

where;

$c_w$ is the specific heat capacity of the water = 4.184 J/g⁰C.

Substitute the given values;

45 x 4.184 x (22 - t) = 8.5 x 0.45 x (85 - 22)

4142.16 - 188.28t = 240.98

188.28t = 4142.16 - 240.98

188.28t = 3901.18

$t = \frac{3901.18}{188.28} \\\\t = 20.7 \ ^0 C$

Thus, the initial temperature of the water that resulted in the final temperature of the water-metal mixture is 20.7 ⁰C.

Learn more here:brainly.com/question/15345295

8 0

3 years ago

HELP!!!!! How much does a sample of Argon weigh if it occupies 25.4 L at a pressure of 2.45 atm and a temperature of 482 K?

Artist 52 [7]

Answer:

62.82 g

Explanation:

From the question,

PV = nRT.................. Equation 1

Where P = Pressure, V = Volume, n = number of moles of argon, R = molar gas constant, T = Temperature.

But,

Number of mole (n) = mass (m)/molar mass(m')

n = m/m'................... Equation 2

Substitute equation 2 into equation 1

PV = (m/m')RT.............. Equation 3

From the question, we were asked to find m.

There make m the subject of formula in equation 3

m = PVm'/RT.............. Equation 4

Given: P = 2.45 atm, V = 25.4 L, T = 482 K

Constant: R = 0.082 atm.dm³.K⁻¹.mol⁻¹, m' = 39.9 g/mol

Substitute these values into equation 4

m = (2.45×25.4×39.9)/(0.082×482)

m = 62.82 g.

5 0

3 years ago

Which substance will require more energy to heat if all the samples have the same mass? A chart with two columns and nine rows.

Paraphin [41]

Here we have to identify the sample which need more energy to heat the sample 1 degree Celsius.

Among the given elements magnesium will require more energy than the others to heat.

As per the definition of specific heat of a compound, the amount of heat required to increase the temperature of the material 1 degree Celsius is the specific heat of the material.

The given data are-

substance specific heat

Lead 0.129

Tin 0.21

Silver 0.235

Iron 0.449

Calcium 0.647

Granite 0.803

Aluminium 0.897

Magnesium 1.023

From the given data lead, magnesium, iron and aluminium have the specific heat 0.129, 1.023, 0.449 and 0.897 respectively. Thus magnesium will require more energy than the others to heat.

6 0

3 years ago

A 10.0g sample of H2O(l) at 23.0degrees C absorbs 209 joules of heat. What is the final temp of the H2O(l) sample? Explain.

IRISSAK [1]

Answer:

Final temperature = 28.0 degrees C.

Explanation:

heat absorbed = mass * specific heat * rise in temperature.

The specific heat of water is 4.186 J /g/C so we have the equation

209 = 10 * 4.186 * x where x is the temperature increase

41.86x = 209

= 5 degrees C.

7 0

3 years ago

What role does the oxidizing agent play in a redox reaction?

mr Goodwill [35]

Answer is "the oxidizing agent receives electrons from the reducing agent".

There are two types of reactants in redox reactions. One is oxidizing agent and other is reducing agent.

Oxidizing agent is a substance which helps to oxidize other substance by gaining electrons. This is also called as oxidizer. Due to the gaining electrons, oxidizing agents tend to be reduced.

Reducing agent or reducer helps to reduce other substance while loosening electrons. Hence, reducing agents tend to be oxidized.

5 0

4 years ago