Balance each equation by writing the correct coefficient (put a space in the box if no coefficient is needed). Then, identify the type of reaction taking place.

1. CaCO3 → CaO+CO2
___CaCO3 → ___CaO+___CO2 is a decomposition reaction.
2. O2+ N2 → NO2
___O2+___N2 → ___NO2 is a synthesis reaction.
3. FeS+ HCl → FeCl2+ H2S
___FeS+___HCl → ___FeCl2+___H2S is a replacement reaction.

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by