All categories

3 years ago

Write a sentence using the term atomic theory

Chemistry

2 answers:

ivolga24 [154]3 years ago

8 0

Atomic theory is the theory that all matter is made up of tiny invisible particles

ahrayia [7]3 years ago

5 0

Atomic Theory can be used in two subjects, physics and chemistry.

You might be interested in

Methyl phenolphthalein and litmus

Butoxors [25]

Answer:

Both are the indicators which helps to identity the acid and base

4 0

3 years ago

Read 2 more answers

What is the Gibbs energy, LaTeX: \Delta GΔ G, when the very first crystal of potassium nitrate forms in solution while cooling,

VARVARA [1.3K]

Answer:

74.344 kJ.

Explanation:

Below is an attachment containing the solution.

3 0

3 years ago

Strontium-90 is a radioisotope that will decrease in mass by one-half every 29 years. How many years will it take for a 10.0-gra

Lelechka [254]

Answer: It will take 29 years for a 10.0-gram sample of strontium-90 to decay to 5.00 grams

Explanation:

Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations. The radioactive decay follows first order kinetics.

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Half life is represented by $t_{\frac{1}{2}$

$t_{\frac{1}{2}=\frac{0.693}{\lambda}$

$\lambda$ = rate constant

Given : Strontium-90 decreases in mass by one-half every 29 years , that is half life of Strontium-90 is 29 years.

As half life is independent of initial concentration, it will take 29 years for a 10.0-gram sample of strontium-90 to decay to 5.00 grams as the amount gets half.

7 0

3 years ago

Classify the following as either an element, compound, homogeneous mixture or

Alecsey [184]

Sodium chloride is the chemical name for salt and is composed of sodium and chlorine, so it is a compound.

6 0

3 years ago

3) In the reaction below, how many grams of carbon dioxide are produced when iron III

Yanka [14]

<h3>Answer:</h3>

132.03 g

<h3>Explanation:</h3>

<u>We are given;</u>

The equation for the reaction as;

Fe₂O₃ + 3CO → 2Fe + 3CO₂

Molar masses of CO and CO₂ as 28.01 g/mol and 44.01 g/mol respectively
Mass of CO as 84 grams

We are required to calculate the mass of CO₂ that will produced.

<h3>Step 1: Calculate the number of moles of CO</h3>

Moles = Mass ÷ Molar mass

Molar mass of CO = 28.01 g/mol

Therefore;

Moles of CO = 84 g ÷ 28.01 g/mol

= 2.9989 moles

= 3.0 moles

<h3>Step 2: Calculate the number of moles of CO₂</h3>

From the reaction, 3 moles of CO reacts to produce 3 moles of CO₂

Therefore; the mole ratio of CO to CO₂ is 1 : 1
Hence; Moles of CO = Moles of CO₂

Moles of CO₂ = 3.0 Moles

But; mass = Moles × molar mass

Thus, mass of CO₂ = 3.0 moles × 44.01 g/mol

= 132.03 g

Hence, the mass of CO₂ produced from the reaction is 132.03 g

3 0

3 years ago