All categories

2 years ago

Write a description of how you know a chemical reaction is occurring.

Chemistry

1 answer:

Sladkaya [172]2 years ago

4 0

Answer:

See explanation

Explanation:

Chemical reactions are also referred to as chemical change. A chemical change often leads to the formation of new substances and is not easily reversible.

A chemical reaction may be accompanied by the emission of heat and light, formation of a precipitate, evolution of gas, or a color change.

These observable physical effects may tell us weather a chemical reaction has taken place or not so we have to observe the system closely for any of these effects stated above.

You might be interested in

Look at this image what type of galaxy is shown? A. barred B. elliptical C. irregular or D. spiral.

rosijanka [135]

It is D

SPIRAL............

4 0

3 years ago

Read 2 more answers

Which of the following are characteristics of ionic

Margarita [4]

Answer:

have high melting and boiling points
are hard
are good conductors of electricity when dissolved in water

Explanation:

Ionic compounds are compounds that are formed between a metal and non-metal with a significant electronegativity difference. The metals transfers their electrons to the non-metals and the electrostatic attraction of the ions brings about the bonding that forms the compound.

Ionic compounds are diverse in nature and form.

Here are some of their properties:

They are usually hard solids with a high melting point or liquids with high boiling points
They are soluble in water and non-soluble in non-polar solvents
They are able to conduct electricity in molten form.
They undergo very fast reaction in aqueous solutions.

6 0

2 years ago

Akeem cut his finger during an investigation, and it is bleeding slightly. Before helping him bandage the wound,

jeka57 [31]

Answer:

b.) Put on protective gloves

4 0

2 years ago

Read 2 more answers

What is Molecule made off? a) Electrons b) Protons c) Atoms d) Nuclei

Naya [18.7K]

Answer: C

There are 2 or more different type of atoms within a molecule

6 0

2 years ago

Read 2 more answers

You wish to measure the iron content of the well water on the new property you are about to buy. You prepare a reference standar

djverab [1.8K]

1.04 ⨯ 10 $^{-4}$ M

<h3>Explanation</h3>

A = ε $\cdot l \cdot c$ by the Beer-Lambert law, where

A the absorbance,
$l$ the path length,
ε the molar absorptivity of the solute, and
$c$ concentration of the solution.

A and ε are the same for both solutions. Therefore, $l \cdot c$ is constant; $l$ is inversely proportional to $c$ . The 100 mL sample would have a concentration 1/4.78 times that of the 45.0 mL reference.

The 13.0 mL standard solution has a concentration of 5.17 ⨯ $10^{-4}$ M. Diluting it to 45.0 mL results in a concentration of $5.17 \times 10^{-4} \times \frac{13.0}{45.0} =$ 1.494 M.

$c$ is inversely related to $l$ for the two solutions. As a result, c₂ = $c_1 \cdot \frac{l_1}{l_2} = 1.494 \times 10^{-4} \times \frac{1}{4.78} =$ 3.126 M.

The 30.0 mL sample has to be diluted by 30.0 / 100.0 times to produce the 100.0 mL solution being tested. The 100.0 mL solution has a concentration of 3.126 M. Therefore, the 30.0 mL solution has a concentration of $3.126 \times \frac{100.0}{30.0} =$ 1.04 ⨯ $10^{-4}$ M.

6 0

3 years ago