Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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atoms for each side of the equation. 11) k₃po₄ + 3hcl → 3kcl + h₃po₄ at…
| Atom | Reactants | Products | | ---- | ---- | ---- | | K | 3 | 3 | | P | 1 | 1 | | O | 4 | 4 | | H | 3 | 3 | | Cl | 3 | 3 |
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fitbq 2: the length of a period in the periodic table is determined by …
# Explicación: ## Paso 1: Recordar la relación entre periodos y electrones En la tabla periódica, el número de electrones que pueden ocupar los orbitales de un nivel energético de…
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which of the following is a nonmetal? a copper b carbon c calcium d ces…
# Breve explicación: Los metales son elementos que son buenos conductores de calor y electricidad, tienen lustre y son dúctiles y maleables. El carbono es un no - metal, mientras …
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37. the ionization energies for element x are listed in the table above…
1. C. Al 2. b. 2A
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22. in a laboratory, 178.8 g of water is separated into hydrogen gas an…
158.8 g
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for each item in column a, write the letter of the matching item in col…
17. c 18. a 19. d 20. e 21. b
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the only nonmetal that is a liquid at room temperature is _. enter the …
Bromo
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the only nonmetal that is a liquid at room temperature is _. enter the …
Mercurio
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which of the following are properties of nonmetals? select all that app…
A. pobres conductores de calor D. opacos y quebradizos
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which atom requires higher ionization energy to remove its valence elec…
Magnesium has a higher ionization energy than sodium, and sodium has a higher ionization energy than potassium. Magnesium's higher ionization energy compared to sodium is due to i…
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which of the following are properties of nonmetals? select all that app…
A. poor conductors of heat, D. dull and brittle
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section 3.2 changes in matter in your textbook, read about physical cha…
The mass of the oxygen gas produced is $158.8\ g$.
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which of the following statements are true about nonmetals? select all …
a. They tend to have higher melting points than metals. - Falso b. They can exist as solids, liquids, or gases. - Verdadero c. They make up the majority of the periodic table of e…
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which of the following statements are true about non - metals? select a…
# Breve explicación: - a. Los metales suelen tener puntos de fusión más altos que los no - metales. Esto es cierto. - b. Los no - metales pueden existir como sólidos, líquidos o g…
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section 3.1 properties of matter in your textbook, read about physical …
7. C. Chemical property 8. C. Chemical property 9. P. Physical property 10. P. Physical property 11. P. Physical property 12. C. Chemical property 13. P. Physical property 14. P. …
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bromine is sometimes used as a disinfectant in swimming pools instead o…
a. cloro
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a is generally a poor conductor of heat and electricity and has a wide …
c. No metal
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matching 13 points match each of the definitions with the correct vocab…
1. Geothermal energy 2. Recycling 3. Fossil fuels 4. Runoff 5. Conservation 6. Non - point source pollution 7. Compost 8. Ore
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multiple - choice question what is a covalent bond? atoms sharing elect…
B. Atoms sharing electrons with each other
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which is not a use for antimony? a fertilizers b bullets c alloys d ele…
# Breve explicación: El antimonio se utiliza en aleaciones para mejorar propiedades mecánicas, en balas debido a su dureza y en electrónica en componentes como diodos y transistor…
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one metal - like property of silicon is its ________, while a nonmetal …
# Breve explicación: El silicio es un semiconductor. Tiene un brillo (lustre) similar al de los metales, pero también tiene propiedades no - metálicas como una conductividad inter…
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what metalloid is used in glass to help prevent it from breaking or cra…
# Breve explicación: El boro se agrega a vidrio para mejorar su resistencia a los cambios bruscos de temperatura y prevenir la formación de grietas. Los metales y metales -oides c…
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which element is not a metalloid? a boron b aluminum c tellurium d anti…
# Breve explicación: Los metalloides son elementos que tienen propiedades intermedias entre los metales y los no - metales. Aluminio es un metal, no un metalloide. Los elementos b…
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how many valence electrons do metalloids have? a 2 - 4 b 3 - 6 c 1 - 2 …
# Explicación breve: Los metalloides son elementos químicos que presentan propiedades intermedias entre los metales y los no - metales. Generalmente, los metalloides tienen 3 - 6 …
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multiple - choice question how many electrons did each nitrogen atoms s…
3 electrons
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which of the following elements is not a metalloid? a boron b carbon c …
# Breve explicación: Los metaloides son elementos químicos que presentan propiedades intermedias entre los metales y los no - metales. El boro, el arsénico y el germanio son metal…
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which of the following elements is a metalloid? a boron b bismuth c alu…
# Breve explicación: Los metalloides son elementos químicos que presentan propiedades intermedias entre los metales y los no - metales. El boro es un metalloide, mientras que el a…
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which of the following elements is a metalloid? a boron b bismuth c alu…
# Breve explicación: Los metales son elementos que presentan características propias como conductividad eléctrica y térmica, maleabilidad y ductilidad. El aluminio (Al) es un meta…
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multiple - choice question how is a \single covalent bond\ shown with d…
With a one dash between symbols
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semimetals is a term which refers to _, a small group of elements that …
# Breve explicación: Los semimetales, también conocidos como metales - no metales o elementos semi - conductores, son un grupo de elementos químicos que presentan propiedades inte…
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which information must be included on a hazardous chemical label? (sele…
A. Precautionary statements B. Signal word D. Hazard pictogram
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which statement about the hazard communication standard is true? select…
The standard ensures that employees receive training and education about the proper use of chemicals.
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where is the best place to find detailed information about a hazardous …
B. On the safety data sheet (SDS)
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which statement best describes the purpose of your organizations hazard…
To provide important safety information about hazardous chemicals to workers
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based on periodic trends, rank the elements in order of increasing elec…
Li < H < C < N
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common personal protective equipment (ppe) used to protect against expo…
B. Latex or nitrile gloves, C. Splash - resistant disposable gowns, D. Safety glasses or goggles
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what information is contained on a safety data sheet (sds)? (select all…
PPE to wear when using the chemical, Instructions for cleaning up an accidental spill or leak of the chemical, First aid measures to take if you are exposed to the chemical
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according to the occupational safety & health administration (osha), wh…
A. Whenever new hazardous chemicals are introduced in your work area D. During orientation to your work area
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(a) which is the limiting reactant when 0.300 mol co and 0.400 mol fe₃o…
$CO$ is the limiting reactant.
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how does osha define a hazardous chemical? select the correct answer an…
A. A chemical that is classified as a physical or health hazard
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what metalloid has commonly been used as an insecticide due to its effe…
# Breve explicación: El arsénico es un metalloide que históricamente se ha usado ampliamente como insecticida y como veneno debido a su efectividad. Las otras opciones, el boro, e…
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what is the purpose of a safety data sheet (sds)? select the correct an…
To provide important safety information about a hazardous chemical
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name ______________________ sept 19 be prepared for a quiz on friday (s…
4, 1, 3, 4
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what information should your organizations hazard communication program…
How to identify hazardous chemicals in your work area
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select the correct answer then click submit. where should you obtain in…
A. Safety Data Sheet (SDS)
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which example of medication administration is considered chemical restr…
B. Medications that are not a standard part of the patient's treatment that are given to control behavior
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question 1 of 9 carbohydrates are organic compounds that primarily serv…
B. Carbon, hydrogen, and oxygen.
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26. garter snake the garter snake is a common species in north america.…
\(|x - 88|\leq42\)
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read the lines from act ii, scene ii of romeo and juliet. juliet: o rom…
hopefulness and longing.
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multiple choice 1 point hydrogen bonds between water molecules are caus…
A. Polarity
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name olivia bettis date 8/15/25 class welding 5th instructor instructor…
1. fused 2. B 3. D. All of the above 4. cold welding 5. tensile strength 6. Resistance spot welding passes an electric current through the metal pieces at the contact point. The r…
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phosphorus determine the ionic name. ion write the chemical symbol and …
Ion name: Phosphide Chemical symbol and charge: $P^{3 - }$ The ionic charge of 3 - is achieved when the atom gains 3 electrons.
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magnesium determine the ionic name. write the chemical symbol and charg…
1. Magnesium 2. Mg, 2+ 3. +2, loses, 2
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answer each question about the following atom when it becomes an ion. s…
- Ionic name: Sodium ion - Chemical symbol and charge: $Na^+$ - The ionic charge of $Na^+$ is achieved when the atom loses 1 electron.
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which compares the gases most commonly released by fertilizers and gase…
Chemicals from fertilizers can release nitrous oxide, while landfills release methane.
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fluorine determine the ionic name. fluoride ion write the chemical symb…
1. Chemical symbol and charge: F, - 1 2. The ionic charge of - 1 is achieved when the atom gains 1 electron.
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like mercury and lead. atmosphere high levels of methane gas detected. …
They will deny the company's drilling permit. Fracking reduces the soil, air, and water quality of an area.
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an oil and gas company plan to expand its fracking area. the company re…
deny
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answer each question about the following atom when it becomes an ion. o…
1. Oxide 2. $O$, 2 - 3. 2 -, gains, 2
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nitrogen determine the ionic name. write the chemical symbol and charge…
1. Ionic name: Nitride ion 2. Chemical symbol and charge: $N^{3 - }$ 3. The ionic charge of $N^{3 - }$ is achieved when the atom gains 3 electrons.
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this is according to the ancient chaldean doctrine of two creations of …
C. malign
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you might have never seen the structure of this molecule before, but yo…
d) Freshly squeezed orange juice
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so if you only know the chemical formula of a sugar, you cannot tell wh…
B. Arrangement of functional groups
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answer each question about the following atom when it becomes an ion. b…
1. Ionic name: Beryllium ion 2. Chemical symbol and charge: $Be^{2 + }$ 3. The ionic charge of +2 is achieved when the atom loses 2 electrons.
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answer each question about the following atom when it becomes an ion. i…
- Ionic name: Iodide - Chemical symbol and charge: $I^-$, - 1 - The ionic charge of - 1 is achieved when the atom gains 1 electron.
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what is the chemical formula of fructose? have a look at the molecular …
A. $C_{6}H_{12}O_{6}$
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when dissolved in water, most glucose molecules form into 6 - membered …
B. Oxygen atoms
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what is the difference between a mixture and a compound? a mixture must…
B. A compound can only be separated into its components by chemical means.
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part 2b 10 marks choose 5 of 6 (lesson 2a) write the atomic notation fo…
a) $\ce{_{93}^{237}Np}$ b) $\ce{_{95}^{241}Am^{1 -}}$ c) $\ce{_{110}^{281}Ds}$ d) $\ce{_{118}^{292}Og^{3 -}}$ e) $\ce{_{69}^{169}Tm}$ f) $\ce{_{107}^{269}Bh^{3 -}}$
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beaker a beakers a & c beaker b beaker c which of the beakers above con…
D. Beaker C
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25. a chemical property of silver wire would be its _____. reactivity w…
reactivity with chlorine
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24. a sheet of paper is torn into several small pieces. which type of c…
Physical change only
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23. you are doing an evaporation experiment of an unknown liquid. when …
A. A mixture because you separated it physically and it is a solution.
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a sample of an unknown pure substance x is analyzed and found to contai…
| substance | mass of $E_1$ | mass of $E_2$ | pure substance? | |--|--|--|--| | A | 13.8 g | 5.24 g | mixture | | B | 18.1 g | 23.9 g | mixture | | C | 26.4 g | 7.55 g | mixture |
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22. which of the following is evidence that a chemical change has taken…
B. All of the above
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21. what is the correct method to separate salt from sand? dissolve the…
dissolve the salt in water - filter off the sand - evaporate the water
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20. melting, evaporating and sublimation ______ heat. nothing happens r…
require
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18. three ice - cubes are mixed into a glass of water. classify the mix…
A. A heterogeneous mixture of a solid and a liquid
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18. which of following is a compound? k ch₄ h₂ o₂
CH₄
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17. which of the following is a homogeneous mixture? chex mix orange ju…
C. a glass of salt water
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16. which of the following is heterogeneous, has the tyndall effect, an…
B. colloid
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1. which of the following is a physical property of a substance in the …
D. definite volume
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14 which of the following is an example of a homogeneous mixture? pure …
Pure air
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13. which of the following is a chemical reaction involving grass? a co…
A patch of grass turning yellow due to lack of sunlight.
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12. how can you distinguish a pure substance from a mixture? a pure sub…
A pure substance has a fixed composition; a mixture has a composition that may vary.
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11. which of the following shows a physical change?
D. (assuming the blue object is ice and represents melting which is a physical change)
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10. calcium hydroxide ca(oh)₂ meets the definition of which of the foll…
O compound
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which picture is the best example of an element?
B. Picture B
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pregunta de opción múltiple ¿por qué no hay fósforo en la atmósfera? el…
Ninguna de las opciones es correcta. El fósforo es un sólido en condiciones normales y reacciona fácilmente con oxígeno y otros elementos, por lo que no se encuentra libre en la a…
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select the correct answer to the question below. which of the following…
A. A person using a pipette to transfer chemicals
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which is the main difference between physical changes and chemical chan…
B. A chemical change forms one or more new substances but a physical change does not.
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an incomplete lewis structure is shown below. the structure only shows …
The oxygen atom will have a positive charge, 3 bonds (C - O, O - H) and 2 lone pairs. The left - hand carbon has 4 single bonds (3 to H and 1 to C), the right - hand carbon has 4 …
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22. you are allowed to enter the chemical preparation/storage area any …
22. B. False 23. B. False 24. A. True
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4. which of the following is a chemical property for sodium (na)? densi…
D. reacts with water
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18. never remove chemicals or other equipment from the laboratory * tru…
18. True 19. False 20. True 21. True
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isotope practice problems element with same # protons, and # of neutron…
- Atom with 15 protons and 17 neutrons: Number of electrons: 15, Atomic number: 15 - Zinc - 64: Number of protons: 27, Number of neutrons: 37 - Zinc - 66: Number of protons: 27, N…
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isotopes - notes and practice introduction how are the hydrogen atoms t…
1. $\frac{37}{17}\text{Cl}$ 2. Isotope notation: $\frac{35}{17}\text{Cl}$, Protons: 17, Neutrons: 18, Electrons: 17 3. Isotope notation: $\frac{14}{6}\text{C}$, Protons: 6, Neutro…
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14. eating hot cheetos is allowed in the lab * true false 15. hot glass…
14. B. False 15. A. True 16. A. True 17. B. False
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11. horseplay or practical jokes in the laboratory are * always against…
11. always against the rules 12. the science instructor 13. wash hands thoroughly with soap and water
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7. personal eyeglasses provide as much protection as * face shield safe…
7. none of the above 8. tied back or kept entirely out of the way with an elastic band, clips, or other confining device