化学
化学反应、化学计量、分子结构与元素性质。
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what is the name of the element? 63 29 cu europlum cobalt copper
copper
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what particle has 10 protons and 11 neutrons? 5 b 10.81 20 ca 40.08 10 …
Ne - 21
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2 matching 20 points match each element to the correct classification. …
fluorine (F) - nonmetal, arsenic (As) - metalloid, copper (Cu) - metal
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revisiting the atom what particle has 11 protons and 12 neutrons? 12 mg…
Na - 23
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which of the following best describes the locations of the metals, nonm…
II, VI, VII
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5 multiple choice 20 points which coefficients wil balance the chemical…
\(2,3,2\) (the fourth option)
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4 multiple choice 20 points identify the products in the chemical equat…
B. \(2H_2O\)
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3 multiple answer 20 points identify the examples that are chemical cha…
C. Water reacting with oxygen, D. Iron rusting
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identify the reactants in the chemical equation. 2h₂ + o₂ → 2h₂o 2 h₂ +…
\(2H_2+O_2\) (the first option)
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question 5 if we treat benzocaine with hcl, what will happen? askcuddy …
it will get protonated
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1 multiple choice 20 points which coefficients will balance the chemica…
1,3,2
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question 4 if we treat benzoic acid with hcl, what will happen? askcudd…
nothing
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according to figure 2, which compound would be extracted if we treat ou…
benzoic acid
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according to figure 2, which compound would be extracted if we treat ou…
A. benzoic acid
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1 multiple answer 20 points how can the image below be classified? comp…
C. mixture
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2 multiple answer 20 points which image represents a compound? a b c d …
C.
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3 multiple choice 20 points which image represents an element? z w x y
C. X
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4:37 w 62 x y 4 matching 20 points match each term to th definition. co…
Compound: Contains two or more different elements that are chemically combined. Mixture: Contain two or more different substances NOT chemically combined. Element: Contains only o…
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4:36 4 matching 20 points match each term to th definition. contains on…
Compound - Contains two or more different elements that are chemically combined. Mixture - Contain two or more different substances NOT chemically combined.
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question 1 of 5 which two terms are related to the energy you get by ea…
A. Chemical, D. Potential
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4:35 z w x y 4 matching 20 points match each term to th definition. com…
Matches with "Contains two or more different elements that are chemically combined."
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a dish is given to you, which contains a blackish - yellow powder. when…
The original powder was a mixture. We know this because it contained two different substances (the black magnetic particles and sulfur) that could be separated by a physical metho…
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23. according to documents you read about the history of ddt, how was t…
as a groundbreaking solution for several problems
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this image shows someone practicing good hygiene. what does this hygien…
the transmission of disease
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explain how two biogeochemical cycles are important for human livelihoo…
The water cycle is important to humans because it provides fresh water for drinking, irrigation, and industrial use. It also regulates climate and weather patterns. The carbon cyc…
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which is one method for detecting cancer? receiving radiation taking ch…
doing proper self - exams
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each orbital can hold how many electrons?
2
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what electron configuration matches an oxygen atom? 1s²2s²2p⁴ 1s²2s²2p⁶…
\(1s^{2}2s^{2}2p^{4}\)
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what is the most likely reason rita dove chose to call this poem a sonn…
The poem contains 14 lines.
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in which orbital diagram is paulis exclusion and hunds rule violated? *…
A.
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answer the following: * the orbital diagram for a ground state oxygen a…
D.
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what atom matches this electron configuration? xe 6s²4f¹⁴5d⁹ mercury go…
Gold
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what is the correct electron configuration for tellurium? * xe 5s², 5d¹…
[Kr] \(5s^{2}\), \(4d^{10}\), \(5p^{4}\) (the third option)
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matching: match the number of electrons found in each block. * 4 points…
S - 2, P - 6, D - 10, F - 14
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what was the first element discovered only by spectroscopy? * 1 point p…
Gallium
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2. list the elements below in order of decreasing atomic radius. (bigge…
\(Ra > Mn > V > As > Kr\); \(Sr>Mg>Be>B>Ne\); \(K > Li > Be > C > F\) (for the relevant subsets in question 2, applying the atomic radius trends across periods (decreasing left - …
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use the drop - down menus to select the correct structural elements. a …
stanza; line; rhyme scheme; meter
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1. fill in the blanks below, and then draw arrows on to the periodic ta…
Generally, atomic radius decreases across periods and increases down groups.
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in poetry, what is the ordered pattern of rhymes at the ends of lines o…
B. Rhyme Scheme
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what type of energy is used by your body when you eat food? thermal ene…
- Question 1: chemical energy - Question 2: thermal energy - Question 3: thermal (heat) energy, gravitational energy, electrical energy, chemical energy, nuclear energy, sound ene…
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what is the overall order of the following reaction, given the rate law…
C. 3rd order
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given the following balanced equation, determine the rate of reaction w…
C. Rate \(=+\frac{1}{2}\frac{\Delta[NH3]}{\Delta t}\)
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a. 40 g b. 88 g c. 104 g d. 256 g 16. which box contains only elements?…
C. Box C
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15. according to the law of conservation of mass, how much mass does th…
C. \(104\space g\)
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15. according to the law of conservation of mass, how much mass does th…
C. \(104\space g\)
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what is the name of this element? argon hydrogen helium
Argon
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13. what happens when an ice cube melts in a beaker of water? a. the te…
13. C. A physical change occurs because the ice changes from a solid to a liquid. 14. C. Hydrogen and oxygen are elements, and water is a molecule.
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which element does this bohr model represent? silicon aluminum magnesiu…
Silicon
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10. a student measured the mass of a candle before and after burning an…
D. Some of the products were gases which escaped and were not measured. ### Question 11
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6. table sugar, or sucrose, is made of carbon, hydrogen, and oxygen ato…
- **Question 6**: C. The properties of molecules are different from the elements they are made from. - **Question 7**: B. They are rearranged. - **Question 8**: C. A lactose molec…
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3. lab partners follow the instructions during their chemistry investig…
C. A chemical reaction occurred when the liquids were mixed. ### Question 4
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science 7 hindenburg explosion post-test (paper version) heat hazard in…
D. The liquids will generate thermal energy.
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science 7 hindenburg explosion post - test (paper version) 1. a student…
D. The liquids will generate thermal energy. ### Question 2
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solubility curve part a at what temperature do kcl and kno₃ have the sa…
- **Part A**: D. \(24^{\circ}C\) - **Part B**: D. It increases
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if i have an unknown quantity of gas at a pressure of 1.2 atm, a volume…
A. 0.125 moles
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1. what are the three main particles that make up an atom? 2. draw wher…
1. Protons, neutrons, electrons 2. In the nucleus 3. Nucleons 4. Positive charge (\(+1\) elementary charge) 5. Negative charge (\(-1\) elementary charge) 6. No charge (neutral) 7.…
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if i have 2.7 moles of gas at a pressure of 0.8 atm and at a temperatur…
B. 98 L
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which factor most increases the rate of dissolving? a cooling b reducin…
D. Stirring
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what is the molarity of 2.0 mol nacl in 4.0 l solution? a 0.5 m b 2.0 m…
A. $0.5\space M$
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a gas sample has an initial pressure of 1.18 atm and occupies a volume …
\(3.15\) L
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a gas sample has an initial pressure of 1.18 atm and occupies a volume …
\(3.14\)
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2.11 unit test: the chemistry of life mid - unit - part 1 due: fri oct …
lons are charged particles.
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30. which of the following factors are important to consider when deter…
All of the above
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which statement about bonding is true? covalent bonds hold atoms of dif…
In covalent bonds, electrons are shared equally.
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why can a carbon atom can form a variety of compounds? it has 2 valence…
It has 4 valence electrons that allows it to bond with up to 4 other atoms.
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how is an organic compound different from an inorganic compound? organi…
Organic compounds contain carbon atoms bonded to other atoms.
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27. an environmental health researcher is evaluating the risk posed by …
The most important factor in the toxicity of a substance is the route it enters our bodies.
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2.11 unit test: the chemistry of life mid - unit - part 1 due fri oct 2…
covalent bond
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what element do all organic compounds have? ○ hydrogen ○ chlorine ○ sod…
carbon
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which best explains why making a pancake from batter is an example of a…
C. A new substance forms when the batter is cooked.
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which of the following will decrease the pressure of a gas in a closed …
B. increasing the volume
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click oil basics to explore the natural resources needed for the produc…
volatile organic compounds
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solubility curve if you make a solution of rbcl with 50g at 10c, how wo…
A. Unsaturated # Part G
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part e what is the solubility of licl at 40c? a it does not exist b 100…
D. 90 g ### Part F
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solubility curve which substance is the most soluble at 70 c? a nano3 b…
A. \(NaNO_3\) # Part D
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read the pros and cons of plastic to explore some of the useful propert…
chemically resistant, non - reactive, durable, easy to manufacture
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solubility curve part a which two substance have the solubility of 115g…
A. \(LiCl\), D. \(NaNO_{3}\) # Part B
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which properties of plastics allow them to be solutions to many complex…
chemically resistant, non - reactive, durable
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a gas occupies a volume of 6.0 l at a pressure of 2.0 atm. if the gas i…
B. 4 atm
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a solution contains 1.5 mol of koh in 750 ml of solution. what is the m…
C. \(2.0\space M\)
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21. a toxicologist is monitoring a communitys long - term exposure to p…
Body burden
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which of these are chemical changes in matter? check all that apply. mi…
bleaching your hair, lighting a match, letting fruit rot
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which of these are physical changes in matter? check all that apply. bo…
boiling water, a pencil being sharpened, freezing water
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wind turning the blades of a windmill to spin a generator to create ele…
mechanical
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determine which type of property each statement describes by typing \ph…
1. physical 2. chemical 3. chemical 4. physical
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the definition of ______ is the sum of all kinetic and potential energy…
thermal energy
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what are three examples of energy transformation? flashlight batteries …
flashlight batteries changing chemical energy to electrical and light energy, the use of turbines and generators to change mechanical energy from wind or water, the human body cha…
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the illustration shows the effect of ___ on sea breezes. seismic energy…
convection currents
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match the definition with the correct term: 1. the substance in which t…
1. a. Solvent 2. b. Mixture 3. b. Adhesion 4. c. Suspension
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porcelain originated in china around 2,000 years ago, but its productio…
C. It identifies when and where porcelain eventually began to be produced in Europe.
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a chemist needs to know the mass of a sample of potassium sulfate to 2 …
\(4.0\times10^{-3}\text{ g}\)
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2. given the relative abundance of the following naturally occurring is…
The average atomic mass of oxygen is approximately \(16.00\) amu. ### Question 3:
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1) properties of ionic compounds a) ____________ melting and boiling po…
1. - a) High - b) Crystalline structures - c) electricity - d) Soluble - e) Brittle 2. - a. Sodium bromide - b. Magnesium oxide - c. Potassium sulfide - d. Lithium oxide 3. - a. \…
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which type of heat transfer occurs when particles of matter move or cir…
- First question: Convection - Second question: Kinetic/Thermal
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which statement correctly classifies gamma emission? (1 point) gamma em…
Gamma emission is a type of radioactive decay, but it is not a fission reaction.
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how can jared most effectively help minimize local environmental health…
by doing research and getting informed about local environmental problems
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which of the following best predicts the type of bond that forms betwee…
A. nonpolar covalent
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using the as\ idea, how many bonds are made in the compound sicl4? n = …
4
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using the as\ idea, how many electrons are \shared\ for the compound si…
\(8\)
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which is a source of water pollution? solid waste accumulation at a lan…
chemical waste discharged from an oil refinery