Which choices indicate a chemical change? _(select all that two liquids mix and release an odor two colors mix to make a new color liquid turns to gas in the form of bubbles when boiling two liquids form a precipitate they all seem correct but only two should be.

Two liquids mix and release an odour .

Two liquids form a precipitate .

Step-by-step explanation:

If the two liquids mix and release an odour, that is a sign that a new substance has formed — a chemical change.

Similarly, if two liquids mix and form a precipitate, a new substance has formed — another chemical change.

B is wrong. The mixing of two colours is a physical change. The coloured substances don’t change. Our eyes just combine the two colours into a new one.

C is wrong. When a liquid boils and forms bubbles of gas, the substance changes from the liquid to the liquid gaseous state, but it is still the same substance. Boiling is a hysical change.

these nuts

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.