Which answer defines exothermic reaction? a process in which energy is released as heat a process in which energy is absorbed as heat a process in which energy is stored and released a process in which energy is not present in a system

Consider the following unbalanced equation: $N_{2}(g)+H_{2}(g)\rightarrow NH_{3}(g)$ How many moles of $H_{2}$ will be required to react exactly with 3.83 mol $N_{2}$ HOW DO WE GET THERE? What is the balanced equation for this reaction (in lowest multiple integers)? $\square N_{2}(g)+\square H_{2}(g)\rightarrow \square NH_{3}(g)$

The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56.Which comparison is best supported by this information? They are in the same group because they have similar atomic masses but they are in different periods because they have different chemical properties. They are in the same group because they have similar chemical properties but they are in different periods because they have very different atomic numbers. They are in the same group because their atomic numbers are each multiples of four, but they are in different periods because they have different chemical properties. They are in the same group because they have similar atomic masses but they are in different periods because they have very different atomic numbers.

All organic compounds contain: Alkene Carbon Chlorine Nitrogen

Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized eleme Both Newlands and Mendeleev arranged elements according to their chemical properties, but used atomic mass as well. Both Newlands and Mendeleev arranged elements according to their atomic masses, but only chemical properties as well. Both Newlands and Mendeleev organized elements into groups, but only Newlands used a tak columns. Both Newlands and Mendeleev organized elements into a table with rows and columns , but ol named different groups of elements.

Choose the proper coefficients for each substance to balance this equation. $\underline {\quad }C_{2}H_{4}(g)+\underline {\quad }O_{2}(g)\rightarrow \underline {\quad }CO_{2}(g)+\underline {\quad }H_{2}O(g)$ 2,3,4,2 2.2.4.2 1,3,2,2 1,1,2,2

Which term refers to the number of protons in an atom of an element? atomic number period average atomic mass symbol

The following chemical reaction takes place in aqueous solution: $FeBr_{2}(aq)+(NH_{4})_{2}S(aq)\rightarrow FeS(s)+2NH_{4}Br(aq)$ Write the net ionic equation for this reaction.

Which polyatomic ion formula and name is NOT correctly paired? 1. $CN^{-}$ cyanate 2. $NO^{-}$ nitrate 3. $ClO^{-}$ chlorate 4. $SO42^{-}$ sulfate 5. $CrO42^{-}$ chromate

How many atoms would be in 3 moles of Oxygen? (3) $(6.02\times 10^{24})$ of 0 atoms (2) $(6.02\times 10^{23})$ of 0 atoms (3) $(6.02\times 10^{23})$ of 0 atoms (4) $(6.02\times 10^{23})$ of 0 atoms

__ is/are types of chemical reaction. Synthesis reaction Redox reaction Precipitation reaction All of the choices