OA. all the known elements that exist in the world today.
Water is a polar molecule because of its shape
Fills volume of the container.
Why? Because the gas particles have a very weak force of attraction so they move very freely and so they always fill the volume of containers.
Answer:
Co²⁺ ions
Explanation:
The ion responsible for the color change in the cobalt solution is Co²⁺ ions. This is because the chemical formula of the given compound is:
CoCl₂;
of the two elements that combined to form this specie, Co is a transition element.
- Transition elements are known to occupy the d-block on the periodic table.
- Most elements here are usually characterized by their variable oxidation states.
- They also produce a wide range of colors.
Explanation:
Yes, a chemical reaction can happen with only one substance.
A typical example of such reaction is the radioactive decay.
Radioactive decay is the loss of elementary particles from an unstable nucleus, ultimately changing the unstable element into another more stable element. .
When radioactive elements are let alone, they decompose to form stable harmless elements.
An example of radioactive decay is attached in the image below;
