Write a essay on endangered animals

How much heat is absorbed by 0.060 kg of copper when it is heated from 20.0°C to 80.0°C if the specific heat of copper is 385J/k

Elina [12.6K]

Answer:

its 1386J

Explanation:

7 0

3 years ago

Many chemistry problems result in equations of the form

Gnom [1K]

Answer:

When this equation is solved, the two values of the unknown are 0.0643 and -0.082

Explanation:

Given

$1.77 * 10^{-2} = \frac{x^2}{0.298 - x}$ --- the actual equation

Required

The values of x

We have:

$1.77 * 10^{-2} = \frac{x^2}{0.298 - x}$

Cross Multiply

$1.77 * 10^{-2} * (0.298 - x)= x^2$

Multiply both sides by 100

$1.77 * (0.298 - x)= 100x^2$

Open bracket

$0.52746 - 1.77x= 100x^2$

Rewrite as:

$100x^2 + 1.77x - 0.52746 =0$

Using quadratic formula:

$x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}$

Where:

$a = 100; b = 1.77; c = -0.52746$

So, we have:

$x = \frac{-1.77 \± \sqrt{1.77^2 - 4*100*- 0.52746 }}{2*100}$

$x = \frac{-1.77 \± \sqrt{214.1169}}{2*100}$

$x = \frac{-1.77 \± 14.63}{200}$

Split

$x = \frac{-1.77 + 14.63}{200}\ or\ x = \frac{-1.77 - 14.63}{200}$

$x = \frac{12.86}{200}\ or\ x = \frac{-16.40}{200}$

$x = 0.0643\ or\ x = -0.082$

3 0

3 years ago

Ozone is produced by incomplete burning of fuels combustion of sulfur containing fuel decaying organic matter photochemical oxid

VARVARA [1.3K]

Ncomplete combustion of fossil fuels; forest fires// heavy traffic ... NS: oxidation of H2S gasfrom decay of organic matter & volcanic activity ... primary pollutant; burning of sulfur containingfossil fuels, coal containing ... HS: combustion of fossil fuel, industrial plants that produce smoke, ash, dust ..... photochemical smog.

7 0

3 years ago

Read 2 more answers

A piece of unglazed porcelain used to test a minerals streak

GrogVix [38]

This piece of porcelain is called a streak plate. This method is a method of rapid qualitative isolation and was developed by Robert Koch. It was developed to obtain pure bacterial cultures.

4 0

3 years ago

Which of the following is a property of an ionic compound?

11111nata11111 [884]

Answer:

C. Involves a metal and a nonmetal.

Explanation:

Ionic compound involves a metal and a non-metal. Ionic compounds have electrovalent bonds between them.

These compounds are usually made up of metals and non - metals combining to form a unit.

The metals usually has low electronegativity and transfers it electrons to the non - metal.
The non-metal has high affinity for the electron.
The electrostatic attraction between the ions formed results in the ionic bond.

6 0

3 years ago