7.04: Chemistry Semester Test - All 25 Questions Correct!!!

What type of chemist would study the energies and heats involved in chemical reactions?

Which chemical formula represents both an element and a molecule?

A miner finds a small mineral fragment with a volume of 5.74 cm³ and a mass of 14.4 g. What is the density of the mineral fragment?

Which subatomic particles have the least mass?

An atom of magnesium has an atomic number of 12 and a mass number of 24. How many protons plus neutrons are in the nucleus?

In which group of the periodic table do you find inert gases?

Which element is the most electronegative?

Which class of elements will contain both solids and gases at room temperature?

Based on its type of chemical bond, which substance has the highest boiling point?

How many electrons are depicted in the electron dot diagram of an electrically neutral carbon atom?

Which feature of a chemical equation represents the law of conservation of matter?

Which equation describes a single-replacement reaction?

Which equation represents a correctly balanced chemical equation?

Hydrogen gas and nitrogen gas can react to form ammonia according to this equation: N2(g)+3H2(g)→2NH3(g) How many liters of hydrogen gas are required to produce 2 moles of NH3(g)?

Methane (CH4), ammonia (NH3), and oxygen can react to form hydrogen cyanide (HCN) and water according to this equation: 2CH4+2NH3+3O2→2HCN+6H2O How many grams of oxygen are required to produce 1 mole of HCN ?

Carbonic acid (H2CO3) forms when carbon dioxide (CO2) dissolves in water according to this equation: CO2 + H2O→H2CO3 How many moles of CO2 must dissolve in an excess of water to produce 4 moles of H2CO3 ?

Which example is a mixture of a gas dissolved in a liquid?

In a sample of which element would you expect to find a sea of electrons surrounding nuclei?

Which reaction substitutes one element in a reactant with another to form a product?

Which choice correctly describes the subatomic particles in the isotope 44Ca?

An electrically neutral atom contains 88 protons. How many electrons are in the atom?

Calcium oxide (CaO) reacts with tetraphosphorus decoxide (P4O10) to form calcium phosphate (Ca3(P4O10)2) according to this equation: 6CaO+P4O10→2Ca3(PO4)2 In a particular reaction, 14.2 g P4O10 reacts with excess CaO and produces 24.8 g Ca3(PO4)2 . Approximately what is the percent yield of the reaction?

What is the correct name for NH4OH ?

Who envisioned the atom as a miniature solar system?

Which of the following combinations of coefficients correctly balances this chemical equation: 2H2S(g)+__O2(g)→__SO2(g)+2H2O(g)

Good luck on your final!