Which element is a liquid at 1000 k

1.ag
2.al
3.ca
4.ni

The correct answer is Option 2.

Explanation:

All the given elements are considered as metals because they all are solid at room temperature and solids are generally solid at room temperatures.

For a solid to change into liquid, it has to attain a minimum temperature known as melting point of that solid.

The melting point of the given elements are:

Silver (Ag) = 1235 K

Aluminium (Al) = 933.5 K

Calcium (Ca) = 1115 K

Nickel )Ni) = 1728 K

From the above melting points, the element which will turn into liquid below  1000 K will be aluminium.

Hence, the correct answer is Option 2.

1.consider the following balanced equation and answer parts a through. show calculations for each part.  

3 ag(s) + 4 hno3(aq) → 3 agno3(aq) + no(g) + 2 h2o(l)  

a. calculate the number of moles of agno3 produced by the reaction of 3 moles of ag with excess hno3. if the number to the left of the compound represents the number of moles of the compound which are present, then 3 moles of ag react with 4 moles hno3 to produce 3 moles agno3 (aq).

so the answer to a would be 3 moles.

b. calculate the number of moles of agno3 produced by the reaction of 108 grams of ag with excess hno3.  

i'm not sure how to plug in the grams of silver into an equation using moles to find how many moles are produced.

c. calculate the number of grams of agno3 produced by the reaction of 108 grams of ag with excess hno3  

d. calculate the number of moles of no produced as a byproduct of the reaction of 108 grams of ag with excess hno3.  

e. calculate the number of grams of no produced as a byproduct starting with 108 grams of ag and excess hno3.  

explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.