CHEM Guías de estudio, Notas de estudios & Resúmenes

Chemistry - Answer-The Study of Matter Matter - Answer-Anything that occupies spaces and has mass How do Chemists Study Matter? - Answer-The Scientific Method Steps of The Scientific Method - Answer-Observation Hypothesis Experiments Theory - Answer-is an explanation of why Law - Answer-is a summary of observations that are true Volume - Answer-Measure of the amount of 3-D space occupied by a substance Classes of zeros - Answer-Leading, Captive, and Trailing Leading Zer...

In this list, which substance can be classified as a chemical? a. salt b. sleep c. cold d. heat e. temperature - Answer-Salt Which of the following is not a chemical? a. salt b. water c. light d. carbon dioxide e. sugar - Answer-Light Chlorofluorocarbons are broken down in the atmosphere by ________. a. nitrogen dioxide b. ozone c. iron d. AIDS e. ultraviolet light - Answer-UV Light The production of smog from NO gas requires ________. a. nitrogen b. chlorine c. water d. oxy...

There is no detectable change in quantity of matter in an ordinary chemical reaction. T/F - Answer-True Balanced chemical equations must always include the same number of each kind of atom on both sides of the equation. - Answer-True Combination reactions have same number of products as reactants True or False - Answer-False 2Mg(s) + O2(g) --> 2MgO(s), which is NOT trueIs a synthesis reaction This reaction produces 2 moles of magnesium oxide All these statements are true ...

Matter - Answer-anything that occupies space and has mass mass - Answer-the amount of matter in an object pure substance - Answer-elements and compounds that cannot be broken down mixtures - Answer-combinations of two or more substances that can be separated or physically mixed heterogeneous mixture - Answer-non uniform composition ex: trail mix homogeneous mixture - Answer-uniform composition ex: salt water qualitative data - Answer-physical characteristics quantitative dat...

What is the height of a 6 m building in centimeters? - Answer-600 cm A balance is used to measure...? - Answer-mass A sample of bismuth has a mass of 7872 g and a volume of 1.64cm3. WHat is the density of bismuth? - Answer-4.80x10cubed g/cm cubed A measurement is said to have high accuracy if it ... - Answer-agrees closely with the accepted standard Number of sig figs in 0.000305? - Answer-3 (1.5560x 10 to the -6) x (7.9860x 10 to the 13th) Don't forget about sig figs. - Answer-1...

When is a compound considered binary? - Answer-when it has two different elements bonded together Where are the anion and cation written in an ionic compound? - Answer-The cation is written before the anion in the name and formula of an ionic compound. Using chemical nomenclature, what is the name for MgI2? - Answer-magnesium iodide What is a polyatomic ion? - Answer-an ion made up of two or more atoms covalently bonded What is the difference between a molecular formula and a structu...

Accuracy? - Answer-Closeness of measurements to the TRUE VALUE of what is being measured Precision? - Answer-Closeness of a SET of measurements How do you calculate Percent Error? - Answer-I experimental-accepted I ____________________ x 100 accepted value Are zeros infront of non-zero digis significant? - Answer-Nope! ex: 0.0071 is only 2 sig figs Are zeros at the end of a number and to the right of the decimal significant? - Answer-Yep! ex: 9.100 is 4 sig figs Addition/S...

gram - Answer-SI unit for mass liter - Answer-SI unit for volume density - Answer-the amount of mass in a given volume (units: g/mL) exothermic - Answer-a reaction that releases heat as a byproduct pure substance - Answer-either an element or a compound chemical forumla - Answer-show the kind(s) and proportions of atoms in a compound (Ex: H2O) Chemical equation - Answer-a way to describe a chemical reaction using chemical formulas for substances and symbols for state of matter....

Fission only - Answer-a very large nucleus splits into smaller pieces fission and fusion - Answer-the total mass before a reaction is greater than the mass after a reaction fission only - Answer-the rate of a reaction can be safely controlled for energy generation in suitable vessels. fusion only - Answer-two small nuclei form a single large one fission and fusion - Answer-less-stable nuclei are converted to more-stable nuclei uncontrolled fusion, controlled fusion - Answer-it req...

What describes metallic compounds? Select all that apply. - Answer-in a solid state, they usually conduct electricity they generally have high melting points Using the electron configuration, how many valence electrons does sulfur (S) have? HINT: Sulfur's atomic number is 16. - Answer-S: 1s222s222p663s223p44 Since there are two electrons in 3s and four electrons in 3p, there are six valence electrons. Oxygen has six valence electrons, and an electronegativity of 3.44. Calcium has two va...