化学
化学反応、化学量論、分子構造、元素の性質。
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the input in a chemical reaction that is changed is called the ○ produc…
reactant
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question 6 (5 points) retake question which of the following is electro…
K2Cl
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24. all are true about an sds sheet except: (a) is where detailed infor…
24. D. Sections 12 - 15 are mandatory to have completed. 25. C. OSHA
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22. the osha workplace safety ergonomic rules focus on training: (a) pr…
22. B. At time of employment, whenever an “Action Trigger” occurs, and every three years. 23. C. OSHA requires annual training for all staff on access and use of Safety Data Sheet…
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question 5 (5 points) the radius ratio range for tetrahedral coordinati…
B. 0.225 - 0.414 (small cation to large anion)
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question 4 (5 points) eight - fold coordination is also known as? trigo…
D. Cubic coordination
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question 3 (5 points) which has an ionic potential less than 10 nm^-1 (…
K
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question 2 (10 points) which is ionic potential? velocity of light in a…
Charge over radius
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what is the meaning of the word nebulous as used in the passage? use th…
vague
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read the passage. then, select the antonym of the word in bold. reba, a…
Clear
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5. how might the final traces (small amounts) of water be removed from …
5. Heat gently in an oven or use a desiccator with desiccant. 6. Incomplete washing; Re - deposition during drying.
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12. what is the reason that scientists have changed the atomic model? 1…
12. New experimental evidence and advanced theories. 13. The number of protons in the nucleus. 14. Equal number of protons and electrons. 15. The motion of particles slows down. 1…
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7. physical properties: a. what type of elements are good conductors of…
a. Metals b. Non - metals c. Iron, nickel, cobalt d. Increases e. Solids and liquids 8. Atom 9. Protons, neutrons, electrons 10. Protons, neutrons 11. Electron cloud surrounding t…
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a grant for waste recovery a factory produces a waste substance when a …
B. The manufacturing process will make the town safer for residents.
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determine whether each statement is true or false. cohesive forces hold…
1. True 2. False 3. False 4. True 5. False
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select the true statements. when adhesive forces are greater than gravi…
When adhesive forces are greater than gravity, water rises in a capillary tube.
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complete the sentences. less adhesive cohesive greater forces between w…
1. Cohesive 2. Adhesive 3. greater
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determine whether each statement is true or false. a scoop - shaped con…
1. True 2. False 3. True 4. True 5. False
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select the true statements. water rises farther in a narrow glass tube …
Water rises farther in a narrow glass tube than in a wide glass tube. Water molecules are held together by hydrogen bonds as they rise in a capillary tube.
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complete the sentences. forces cause water molecules to stick to the gl…
- Adhesion - Cohesion - Adhesion; cohesion
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complete the sentences. a concave meniscus forms in a glass column when…
A concave meniscus forms in a glass column when adhesive forces between water and glass are greater than cohesive forces between water molecules.
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select the true statements. surface tension only forms on large bodies …
C. Water molecules on the surface are pulled downward by the molecules below. D. Hydrogen bonds between water's surface and a water strider allow it to walk on water.
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select the true statements. cohesive forces push water molecules away f…
B. Cohesion is an attractive force between the same kinds of molecules. C. A water molecule can form hydrogen bonds with several other water molecules. D. The cohesive forces betw…
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are constantly broken and reformed as water molecules slide past each o…
A slightly negative oxygen atom in a water molecule forms a hydrogen bond with a slightly positive hydrogen atom in another water molecule.
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question 21 (1 point) the number of molecules contained in 22.4 l of an…
\(6.02\times 10^{23}\)
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question 18 (1 point) what is the ph of a 0.0001 m aqueous solution of …
4
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question 17 (1 point) if it takes 19 ml of h₂so₄(aq) to neutralize 50.0…
0.11 mol/L
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question 16 (1 point) find the percent concentration (m/v) when 14.2 g …
3.16%
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | $Ca^{2+}$ | $MnO_{4}^{-}$ | $Ca(MnO_{4})_{2}$ | calcium permanganate | | $Mn^{3+}$ | $NO_…
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multiply or divide the following measurements. be sure each answer you …
1.54 mol $1.1\times10^{3}\frac{mol}{L}$ 11.5 $\frac{g}{mL}$
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balance the chemical equation below using the smallest possible whole -…
$1N_2(g)+3H_2(g) ightarrow2NH_3(g)$
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instructions: choose an answer and hit next. you will receive your scor…
a chemical property.
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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of e) | approximate mass (amu) | location on diagram | |--|--|--|--|--| | electron | $e^-$ | - 1 | 0 | B | | neutron | $n^0$ | 0 | 1.0 | A |…
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a student conducts an experiment to determine the effect of adding salt…
amount of salt added
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for each list, place elements in order of least to greatest atomic radi…
1) Ar, Si, Na 2) B, Ga, In 3) Ne, Br, Cs
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a chemical engineer must report the average volume of a certain polluta…
\(13.1\) L
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a chemistry student must write down in his lab notebook the concentrati…
$2.78\ g\cdot mL^{-1}$
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question 5 (1 point) use your anchor charts to answer, which is a short…
Question 5: c. increased nausea and vomiting Question 6: a. brain damage Question 7: a. Heart disease and high blood pressure
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concept 1 multiple choice (2 pts each) 1. all of the following pieces o…
1. C. petri dish 2. D. Graduated cylinder
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question 1 (15 points) match the correct vocab word with its definition…
1. 1 - h 2. 2 - c 3. 3 - o 4. 4 - n 5. 5 - b 6. 6 - l 7. 7 - e 8. 8 - m 9. 9 - a 10. 10 - j 11. 11 - f 12. 12 - g 13. 13 - i 14. 14 - k 15. 15 - d
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14.) explain the 2 steps to measure the ph level of a substance: * *you…
1. Prepare a pH - indicator or pH - meter. 2. Immerse the indicator or pH - meter electrode in the substance and determine the pH value.
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6.) during a chemical reaction, ______ are either formed or broken. * o…
6. D. bonds 7. False
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10.) when 2 hydrogen atoms bond with an oxygen atom, it produces water.…
Hydrogen atoms and oxygen atom
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10.) when 2 hydrogen atoms bond with an oxygen atom, it produces water.…
Hydrogen and oxygen
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9.) what is the name of the new substance formed in a chemical reaction…
B. product
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4.) ________ is the amount of energy needed to start a chemical reactio…
B. Activation energy
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mrs. jacksons science class is learning about how baking soda and vineg…
$1\frac{2}{7}$ liters
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unit 2 assessment which bonds could a single carbon atom have? a. 2 tri…
C. a triple bond and a single bond
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unit 2 assessment the smallest particle of matter that can retain the c…
A. átomo
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unit 2 assessment atoms connected by covalent bonds share a. hydrogen i…
C. pares de electrones
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unit 2 assessment this model shows a fructose, a common sugar. which el…
C. Nitrógeno
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unit 2 assessment the images show carbon - based molecules found in liv…
# Breve explicación: El carbono tiene cuatro electrones de valencia y puede formar hasta cuatro enlaces químicos. Esto le permite crear enlaces con diferentes átomos, incluyendo o…
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unit 2 assessment which pair of molecules are both compounds? a. h₂, co…
# Explicación breve: Un compuesto químico es una sustancia formada por dos o más elementos químicos en proporciones fijas. En la opción C, CO₂ (dióxido de carbono) y H₂O (agua) so…
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unit 2 assessment the model shows water molecules interacting. the gray…
B. Los átomos de oxígeno en moléculas de agua se atraen a ambos átomos de oxígeno y átomos de hidrógeno.
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20) a coffee cup calorimeter has c_cal = 105.5 j °c⁻¹ and is initially …
C. $-64\ kJ\ mol^{-1}$
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in the context of abdominal pain, what condition should be considered w…
C. Irritable bowel syndrome
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question 33 which regulatory mechanism for hydrogen ion concentrations …
C. Renal mechanisms
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multiple choice 1 point what is the first reaction in the alarm respons…
The brain receives a danger signal.
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you can draw the structures of some common atoms by knowing their atomi…
For Helium: Nucleus with 2 protons and 2 neutrons, 2 electrons in first energy level. For Lithium: Nucleus with 3 protons and 4 neutrons, 2 electrons in first energy level, 1 elec…
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7. read this passage from the article: pets count on their human handle…
7. D. understanding and devoted 8. A. Being around animals can decrease stress and increase levels of feel - good chemicals in the body.
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self - esteem. and experts say thats probably because looking after ani…
B. Being around animals can increase levels of stress - reducing chemicals in the body like serotonin.
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what influences soil permeability? the ph and flavor of the soil the so…
C. soil texture, organic material, and pore space
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airborne chemical substances travel up the nose to the olfactory _, whi…
A. cilia
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13. use what you have just learned about chemical formulas to identify …
a. Element b. Compound c. Mixture d. Mixture e. Compound f. Element
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question 17 what is the formal charge on the central atom in the given …
0 A. Na < Si < N < O
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question 25 is this a valid lewis structure for clf₅? choose the best a…
Question 25: C. Yes, because Cl can have an expanded octet but F cannot. Question 26: (Assuming the option with Xe having 3 lone pairs and single bonds to F) The correct Lewis str…
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question 17 a student proposed the following lewis structure for ch2cl2…
0 O > N > P > Al
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choose the correct answer. what influences soil permeability? soil text…
soil texture, organic material, and pore space
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what kinds of substances can leaching carry downward through the soil? …
nutrients, pesticides, and potentially harmful chemicals
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what is the wrong with this proposed lewis structure for of2? :f≡o—f: i…
I, III, IV The first option (with C single-bonded to 2 H and 2 Cl, each Cl having 3 lone pairs)
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question 10 identify the best lewis structure for no₂⁺. :o—n—o: ⁺ :o=n=…
B. [:O=N=O:]+
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select the correct answer. which of these elements is a halogen? a. pot…
E. bromine (Br)
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select the correct answer. in this redox reaction, identify the reducin…
B. Li
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select the correct answer. which statement best describes the propertie…
B. They may be gases, liquids, or solids at room temperature, and have a low melting and boiling point.
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select the correct answer. which equation obeys the law of conservation…
A. \(2C_4H_{10}+2Cl_2 + 12O_2 ightarrow7CO_2+CCl_4 + 10H_2O\)
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select the correct answer. which of these 2a elements has the largest a…
E. radium
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select the correct answer. what is the characteristic angle between ato…
B. 180°
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select the correct answer. which of these elements has two valence elec…
B. barium (Ba)
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select the correct answer. which acid has the formula hno₂? a. hydronit…
D. nitrous acid
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select the correct answer. hydrogen (h - 1), deuterium (h - 2), and tri…
D. a = 1, b = 1, c = 2
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select the correct answer. dry ice, or solid carbon dioxide, has the mo…
B. compound
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select the correct answer. which statement is true of a chemical change…
A. It involves changes in the molecular structure.
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select the correct answer. the ions cr³⁺ and o²⁻ combine to form the io…
D. 2:3
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select the correct answer. which of these groups of elements show the l…
C. alkali metals (1A)
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select the correct answer. which is a chemical property of hydrogen? a.…
B. It is a combustible gas.
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what is the nature of the p - o bond in phosphorus pentoxide (p₂o₅)? el…
B. moderately polar covalent
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select the correct answer. if the coefficient 2 is placed in front of t…
A. 8 iodine atoms and 18 oxygen atoms
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which is the correct lewis structure for ethylene, c₂h₄?
A. A
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select the correct answer. which is the correct lewis dot structure of …
B. H—N—H with a single dot above the N
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select the correct answer. what is the order in which electrons start f…
A. 1s 2s 2p 3s 3p 4s 3d 4p
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select the correct answer. the atomic mass of iron is 55.85, and oxygen…
C. 159.7 g
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14 select the correct answer. using the information in the table, what …
B. 32.060 amu
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select the correct answer. which types of orbitals are found in the pri…
D. $s, p$
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select the correct answer. what can you say about a calcium atom by loo…
D. A calcium atom has 20 protons and 24 neutrons.
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select the correct answer. which of the following states that an orbita…
C. Hund's rule
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select the correct answer. what causes the difference in bond angles in…
C. the fact that the number of lone pairs of electrons on the central atom is greater in the case of water
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select the correct answer. the atomic mass of potassium is 39.1. what i…
B. 39.1 g
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select the correct answer. which pair of atoms has the highest electron…
A. Na - F
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select the correct answer. which is an example of a solution? a. flour …
C. salt and water
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select the correct answer. imagine that a new polyatomic anion called \…
B. platonic acid