Why were Opportunity and Spirit sent to Mars' surface? A. to look for alien life B. to study the rocks and soil C. to study the atmosphere D. to mine for specific minerals

Is a cation bigger than an anion

What type of reaction is shown below? Check all that apply. Ca + 2H2O → Ca (OH) 2 + H2 synthesis decomposition combustion single replacement double replacement

The only large land mass (es) not part of a sovereign state is/are

What is the mole ratio of D to A in the generic chemical reaction? 4A + B - -> C + D

Which one of the following statements is true? A. Some real gases have lower pressures than that calculated for the ideal gas because of attraction between molecules. B. For a real gas, PV is always less than nRT. C.

In a first order reaction, what fraction of the reactant will remain after 4 half-lives?

Which trends are observed when the elements in Period 3 on the Periodic Table are considered in order of increasing atomic number? (1) The atomic radius decreases, and the first ionization energy generally increases.

The enthalpy of formation of MX is ΔHf° = - 525 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 139 kJ/mol. The ionization energy of M is IE = 437 kJ/mol. The electron affinity of X is ΔHEA = - 313 kJ/mol. (Refer to the hint).

Which group of elements could you not use in making fireworks?

A 5.0 M solution of HCL in water has a proton concentration of _M