CHEMISTRY MIDDLE SCHOOL

What differs between a radioactive isotope and a stable isotope?A. Stable isotopes are shorter
B. Radioactive Isotopes last for less time
C. Radioactive isotopes last longer.
D. There is no difference

Answers

Answer 1
Answer:  A radioactive isotope is emitting particles such as a fast moving electron or positron (radiation) and this is changing its structure. Eventually it may reach a stable configuration and will no longer decay. An stable isotope is simply a name for a form of an element which is chemically identical to other atoms of the element but with a different number of neutrons. I hope this helps!
Answer 2
Answer:

Radioactive isotopes last for less time, is the one among the following choices given in the question that shows the way a radioactive isotope and a stable isotope differs

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What is the balanced chemical equation for the reaction between Hydrochloride acid and calcium carbonate when the products of the reaction are calcium chloride Carbon Dioxide and water
Name the type of chemical reaction : CaO(s) + H2O(l) -----------Ca(OH)2(aq)

A potential energy diagram is shown.
What is the activation energy of this reaction?

Answers

Answer:

Ea = 35 kJ.

Explanation:

Activation energy (Ea) is the difference between the potential energy of intermediate "activated complex/ peak" and reactants.

Ea = P.E. of products - P.E. of reactants = 65 kJ - 30 kJ = 35 kJ.

kindly find the attached image.

Calculate the number of molecules in a sample of carbon dioxide with a mass of 168.2 grams

Answers

Answer: 2.30x10²⁴ molecules CO2

Explanation: Solution:

Convert mass of CO2 to moles

Convert moles of CO2 to molecules using Avogadro's number.

168.2 g CO2 x 1 mole CO2 / 44 g CO2 x 6.022 x10²³ molecules CO2 / 1 mole CO2

= 2.30 x10²⁴ molecules CO2

Final answer:

The sample of carbon dioxide weighing 168.2 grams contains approximately 2.30 x 10^24 molecules. This is calculated by first converting the sample mass to moles, and then multiplying by Avogadro's Number.

Explanation:

To calculate the number of molecules in a sample, you need to know the formula for the substance and the molar mass of the substance. For carbon dioxide (CO2), the molar mass is 44.01 grams/mole.

The sample mass is 168.2 grams, so to calculate the number of moles, we divide the mass of the sample by the molar mass:

Number of moles = Sample Mass / Molar Mass =168.2 grams / 44.01 grams/mole = 3.82 moles (rounded to two decimal places).

The number of molecules is then calculated by multiplying the number of moles by Avogadro's Number (6.022 x 10^23 molecules/mole):

Number of molecules = Number of Moles x Avogadro's Number = 3.82 moles x 6.022 x 10^23 molecules/mole = 2.30 x 10^24 molecules (rounded to two decimal places).

Learn more about Number of Molecules here:

brainly.com/question/32071669

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What findings led Thomson to infer that particles that are smaller than atoms do exist?

Answers

That electrons are small enough to fit in side a atom . (:

The spinning of an object on its axis is called?

Answers

The spinning of an object on its axis is called rotation. For example the the earth.
The answer would be called a rotation.

Iron Man died in Infinity Wars, so Mrs. Nogaki has decided that she is going to make her own super hero suit to save the world. She has decided that her suit must have these properties.• It must not be brittle (it must with stand Hulk’s temper without cracking)

• It must have a high melting temperature (so the rockets don’t melt it)

Which kind of bonds should the material Mrs. Nogaki chooses to make her suit from have?

Question 6 options:

Metallic Bonds


Covalent Bonds


Ionic Bonds

Answers

Answer:

Ionic Bonds

Explanation:
Yea it’s Ionic Bonds

What state of matter is carbon at room temperature

Answers

Carbon is a solid at room temperature. 
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