BRITTTON PRESENTS YOU WITH QUALITY EXAM,TESTBANKS AND ASSIGNMENTS

The histogram below displays the distribution of 50 ages at death due to trauma (accidents and homicides) that were observed in a certain hospital during a week. What percentage of deaths were individuals younger than 35? - correct answer 68% From the histogram we can find that 3 + 18 + 13 = 34 out of the 50 observations fall below age 35 (those within the first three bars), and since the question asks about the percentage of observations, the answer is (34/50) * 100 = 68%. Here again...

bonding - correct answer chemical combination of atoms compounds - correct answer result of chemical combinations of atoms octet - correct answer having eight valence electrons that is the most stable Why do atoms bond? - correct answer atoms are trying to achieve an octet How can an octet be achieved? - correct answer 1. gaining/losing electrons 2. sharing electrons Octet Rule - correct answer atoms tend to lose, gain or share valence electrons with other atoms in order to...

Precision - correct answer how close measurements are to each other Accuracy - correct answer closeness of a measurement to the actual value observation - correct answer info that you obtain through senses inference - correct answer conclusions drawn based on observations directly proportional - correct answer if one variable goes up and the other variable goes up inversely - correct answer if one variable goes up and the other variable goes down manipulated variable - c...

Chemistry - correct answer - experimental science - studies the propertiesof materials and the changesthey undergo. - Supplies answers to questions in almost every aspect of our lives.• - Ex: Why does ice melt? How do batteries generate electricity? Why do leaves change color? - a "central science" Matter - correct answer - a material chemistry studies - the physical material of the universe - It is anything that has mass and occupies space. - has a volume ex: Our book, you...

Molecular Mass (Beginning of Ch. 3) - correct answer The atomic masses of all atoms in a molecule. Ex: O2, H2, Na, etc. Formula Mass - correct answer The atomic masses of all atoms in a formula unit of a compound, whether molecule or not (ionic bonds). Ex: Ca(OH)2, CH3NH2, etc. Avagadro's Number - correct answer Number of atoms in 12g of carbon-12 6.02 x 10^23 Percent Composotion - correct answer Mass percentage of each element in the compound. Determining Mass Percenta...

When the equation below is balanced, the coefficient of sulfuric acid, H2SO4 is: NaCN + H2SO4 → Na2SO4 + HCN A) 3 B) 4 C) 1 D) 2 - correct answer 1 The pH = -log[H+] for a solution. The pOH = -log[OH-] for a solution. The pH and pOH are related, and their sum is equal to 14 (pH + pOH = 14). If the concentration of a dilute solution of potassium hydroxide is 0.001 M, what is the pH of that solution? A) 11 B) 7 C) 3 D) 2 - correct answer 11 Which of the following is NOT ...

In order to test a hypothesis, what should the order of the following steps be? - Analyze data - Confirm or revise the experiment - Collect data - Design an experiment - correct answer 1. Design an experiment 2. Collect Data 3. Analyze Data 4. Confirm or revise the experiment Which of the following experiment setups would be the best way to test your hypothesis? A. After the exam, give students a survey questioning their study habits and what grade they made on their exam. B. Be...

True or False. An atom of magnesium has two valence electrons. Select one: True False - correct answer True True or False. Based on their respective locations on the periodic table, sodium and sulfur are expected to share similar chemical and physical properties. Select one: True False - correct answer False True or False. N3O5 is an example of an ionic compound. Select one: True False - correct answer False True or False. Six valence electrons are shared in a triple covalen...

What is the height of a 6 m building in centimeters? - correct answer 600 cm A balance is used to measure...? - correct answer mass A sample of bismuth has a mass of 7872 g and a volume of 1.64cm3. WHat is the density of bismuth? - correct answer 4.80x10cubed g/cm cubed A measurement is said to have high accuracy if it ... - correct answer agrees closely with the accepted standard Number of sig figs in 0.000305? - correct answer 3 (1.5560x 10 to the -6) x (7.9860x 10 to the 1...

What statements is true about any element? - correct answer It can be identified on the basis of its properties, it has a unique set of properties, it is different from all other elements. The mass number of an atom is its number of - correct answer protons plus neutrons. Bohr's model of the atom differs from Rutherford's model in - correct answer the location of electrons Rutherford's research involved - correct answer alpha particles and gold foil Which element has ato...

What is the term used for findings that are summarized based on a pattern or trend? a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction - correct answer a. Law Which of the following is a tentative explanation for a set of observations? Select one: a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction - correct answer b. Hypothesis If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? Select one: a. Solute b. Compound c...

According to ancient Chinese beliefs, what two forces were responsible for bringing the earthly world into existence? - correct answer yin and yang According to the Greek philosopher Thales in 600 B.C., what single element composed Earth, air, and space? - correct answer water According to the Greek philosopher Empedocles in 450 B.C., what four basic elements composed everything in nature? - correct answer water, air, earth, fire According to the Greek philosopher Aristotle in 350 B....

Which of the following is soluble in water? a. AgCl b. Rb2CrO4 c. Hg2I2 d. CaSO4 e. PbBr2 - correct answer b. Rb2CrO4 Based on the solubility rules, which of these processes will occur if solutions of CuSO4(aq) and BaCl2(aq) are mixed? Select one: a. CuCl2 will precipitate; Ba2+ and SO42- are spectator ions. b. CuSO4 will precipitate; Ba2+ and Cl- are spectator ions. c. BaSO4 will precipitate; Cu2+ and Cl- are spectator ions. d. BaCl2 will precipitate; Cu2+ and SO42- are specta...

What is Matter? - correct answer ______ is anything that occupies space and has mass. What is Mass? - correct answer ____ is the amount of matter in an object; never changes What is Weight? - correct answer _______ is the gravitational force exerted on an object; can change Define: Element - correct answer _______ is made up of molecules/atoms of the same kind; cannot be chemically subdivided into simpler substances Define: Compound - correct answer ________ is made up of molecu...

atom - correct answer -composes all mass -mostly empty space nucleus - correct answer -10^-10 angstrong radius -consists of protons and neutrons (together nucleons) -particles equal in size and mass -held together by strong nuclear forces -stability measured by binding energy binding energy - correct answer -energy required to break nucleus into individual particles electrons - correct answer -1 to 3 angstrom from nucleus -mass 1800x smaller than nucleon electronic charge -...

Science - correct answer A method of asking questions and finding answers. Matter - correct answer Everything in the universe that has mass or occupies space. Energy - correct answer The capacity to transfer heat or do work. Chemistry - correct answer The study of composition, structure, and properties of matter. Homogenous - correct answer A mixture that is uniform throughout. (i.e. vinegar) Heterogenous - correct answer A mixture that is NOT uniform throughout. (i.e. salad...

states of matter Solid Liquid Gas - correct answer Solid- Definite shape, definite volume, particules are in a fixed position, close to one another, vibrate in place, and move slowely. Liquids- Indefinate shape, definite volume, in a fixed position, and able to "flow" around each other. Gas- Indefinite shape, indefinite volume, Not in a fixed position, and they move freely and randomely. Define physical property and give an example. - correct answer Can be observed or ...

What is the term used for findings that are summarized based on a pattern or trend? a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction - correct answer a. Law Which of the following is a tentative explanation for a set of observations? Select one: a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction - correct answer b. Hypothesis If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? Select one: a. Solute b. Compound c...

matter - correct answer anything that has mass and takes up space physical property - correct answer characteristic of a substance observed without changing it into another substance solid - correct answer definite shape and definite volume liquid - correct answer definite volume but indefinite shape gas - correct answer indefinite shape, indefinite volume plasma - correct answer state of matter that occurs when energy such as electricity or heat is applied to a gas. mass...

An endothermic reaction causes the surroundings to: A. warm up B. become acidic C. condense D. decrease in temperature E. release CO2 - correct answer D An exothermic reaction causes the surroundings to: A. warm up B. become acidic C. expand D. decrease its temperature E. release CO2 - correct answer A Copper metal has a specific heat of 0.385 J/g•oC and has a melting point of 1083oC. calculate the amount of heat required to raise the temperature of 22.8 g of Cu from 20.0oC...