10. Is the identity of an element determined by its mass number or atomic number?

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I don't unerstand what I'm supposed to do for these Heat = mass * c * temp change 175g 0.79J/gC 75 C Heat = mass * c * temp change 352g 1.65J/gC 25 C Heat = mass * c * temp change 268g 4.18J/gC 40 C Heat = mass * c * temp change 74g 0.

45.62mg of toluene is combusted and we get 152.5mg of carbon dioxide and 35.67mg of water vapor. What is the empirical formula of toluene?

Identify the nuclide produced when carbon-14 decays by beta emission: 14 6c? 0?1e?

The following chemical reaction occurs in a basic solution. NO3 - (aq) + ClO - (aq) + H2O (l) → NO (g) + ClO2 - (aq) + OH - (aq) How many moles of electrons are transferred when the equation is balanced using the smallest whole-number coefficients?

Which of the following statements about alkali metals is true? alkali metals have full valence shells alkali metals form 1 - cations alkali metals are very reactive alkali metals form 2 - cations

Hexane and hexene are hydrocarbon compounds from different homologous series. the combustion of these two compounds produce different amount of soot. explain the difference based on the percentage of carbon by mass.

Reactants → products Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

What is the first step in the scientific method? A. form a hypothesis B. illustrate the process C. observe and ask questions D. draw conclusions

Nitrogen oxide racts with bromine to form nitrosyl bromide. A sample of 0.0655 mol NO with 0.0328 mol Br2 gives an equilibrium mixture containing 0.0389 mol NOBr.

Determine the elements present in sodium hydrogen carbonate