question 1 (1 point)
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in the first reaction with epsom salt added to ammonia, what evidence was there for a chemical reaction taking place?

question 1 options:

color change

formation of a precipitate

increase in temperature

formation of bubbles

question 2 (1 point)
in the second reaction with iron and oxygen, what evidence for a chemical reaction was not observed?

question 2 options:

new substance formed

formation of a precipitate

color change

change in temperature

question 3 (1 point)
in the third reaction which gas is released when baking soda is added to vinegar?

question 3 options:

carbon dioxide

hydrogen gas

water

oxygen

question 4 (1 point)
in the fourth reaction with copper sulfate and sodium hydroxide, what is the precipitate that is formed?

question 4 options:

cu(oh)2

naoh

cuso4

na2so4

Question #1) The formation of a precipitate

Question # 2) ? Insufficient information

Question # 3) when you mix baking soda (sodium bicarbonate) with vinegar (acetic acid) the baking soda is the base and the vinegar is the acid, the baking soda takes a proton from the acid and the products of the reaction are H2O and CO2. The initial two products are carbonic acid and sodium acetate and the second part of the reaction is the decomposition reaction with the carbonic acid immediately decomposing into water and carbon dioxide gas. The CO2 rises to the surface creating bubbles.

Question #4) when sodium hydroxide, a strong base reacts with copper sulfate an acidic salt as a blue precipitate of copper hydroxide is produced with ions of sodium sulfate in solution. This represents a double displacement reaction as well as a precipitation reaction.

Explanation:

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

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