Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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identify the element, the mass, and the charge. 10. p = 37 e = 36 n = 4…
10. Element: Rubidium (Rb), Mass: 85, Charge: +1 11. Element: Oxygen (O), Mass: 15, Charge: -2
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an iron pipe has a density of 7.86 g/ml and a volume of 324.4 ml. what …
$2549.784\ g$
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you sprinkle 5 grams of sugar on your cereal. sugar has a density of 1.…
$3.14$ cm³
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multiple select question select all that apply the term carbohydrate re…
water, carbon
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5. what is the effect of adding a basic substance such as a stomach aci…
A. It raises the pH of the acid and brings it closer to neutral.
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a silver necklace has a density of 10.5 g/ml and a volume of 1.5 ml. wh…
$15.75\ g$
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a thermometer contains 5.00x10^(-1) ml (0.5 ml) of mercury and mercury …
$6.795\ g$
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a thermometer contains 5.00×10⁻¹ ml (0.5 ml) of mercury and mercury has…
$6.795\ g$
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an atom with 4 protons and 4 neutrons: play with the simulation. which …
Protons and electrons affect the charge of an atom or ion.
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5. a lead pellet has a volume of 1.2x10⁻³ ml (0.012 ml) and a density o…
The mass of the silver necklace is $15.75\ g$, the mass of mercury in the thermometer is $6.795\ g$, and the mass of the lead pellet is $0.1356\ g$.
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positive ions have __________________ protons than electrons. negative …
more, fewer
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determine the number of protons, electrons, and neutrons for each isoto…
5. p = 19, e = 19, n = 39 - 19=20 6. p = 14, e = 14, n = 28 - 14 = 14 7. p = 40 - 21=19, e = 19, n = 21 9. Osmium (Os) has atomic number 76. So p = 76, e = 76, n needs more info o…
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a lead pellet has a volume of 1.2×10⁻² ml (0.012 ml) and a density of 1…
$0.1356\ g$
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c an atom with 4 protons and 4 neutrons. 6. play with the simulation. w…
a. the same number of b. more c. fewer
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1. which of the following foods taste sour? banana, lime, pineapple, br…
1. Lime, Pineapple, Lemon 2. Laundry detergent, Soap
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5. what is the name of the following atoms? a. an atom with 3 protons a…
a. Lithium b. Helium c. Beryllium
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3. what particle(s) are found in the center of the atom? 4. play until …
3. Protons and neutrons 4. Protons 5. (Incomplete information)
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for each statement below write true or false. if false, make the statem…
1. False 2. True 3. True 4. True
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3 what particle(s) are found in the center of the atom? 4 play until yo…
3. Protons and neutrons 4. Protons 5a. Lithium 5b. Helium 5c. Beryllium 6. Protons and electrons 7a. the same number of 7b. more 7c. fewer
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solubility always increases as temperature increases. at 40°c, kcl has …
The rate of change in the solubility of \(KNO_3\) changes as temperature increases.
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a scientist collects data on the solubility of different salts at diffe…
For most of the salts ($Pb(NO_3)_2$, $KNO_3$, $KCl$, $NaCl$) shown in the graph, the solubility increases as the temperature increases, while the solubility of $Ce_2(SO_4)_3$ decr…
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which would make water impure? adding chemicals adding ice
adding chemicals
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which of the following medication categories require special handling p…
B. Chemotherapy agents
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what is the most common cause of diaper rash? (select all that apply.) …
A. Allergies B. Irritating chemicals in diapers C. Incontinence D. Taking antibiotics
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molar mass of baking soda (nahco₃), g/mol how to get the value: calcula…
84.008 g/mol
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a pharmacy technician has just finished preparing a chemotherapy medica…
Hazardous medication bin
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how does the way a buffer stabilizes ph during addition of acid differ …
First question: It's the same reaction running backward or forward. Second question: Amino acid side chains have many carboxyl and amino groups.
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part c buffers work best when ... the ph is nearly neutral. nearly all …
about half of the buffer molecules are dissociated
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the (whmis) symbols were developed to standardize the labelling of dang…
Can cause long - term health effects like organ damage or cancer.
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question 10 match the following for its physical state: _1_ definite sh…
1. 1. solid 2. 3. gas 3. 2. liquid
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data sheets (to fill) table 1. titrating baking soda with vinegar: expe…
$60.052\ g/mol$
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though you add heat, the temperature of boiling water remains constant …
1. It takes energy to break hydrogen bonds. 2. (a) Water molecules make hydrogen bonds at definite angles.
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1) how many elements have positive melting points? element melting poin…
1. **Explicación paso a paso**: - **Paso 1: Identificar los elementos con puntos de fusión positivos** - Miramos la columna de puntos de fusión en la tabla de elementos. Los punto…
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mixtures can occur between and among all phases of matter. which of the…
C. sugar in water
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18 pure copper metal has a very high conductivity. brass, an alloy of c…
D. because the physical properties of the mixture are different than its components
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which statement helps to explain why ice is less dense than liquid wate…
First question: A. Water molecules make hydrogen bonds at definite angles. Second question: A. aquatic life to exist at the North Pole.
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8. examine the diagram below. choose a word from the drop - down menu f…
8. Choice 1: valleys; Choice 2: transform 9. A. fault 10. deposition: Physical concrete walkway expanding during a hot summer day: Physical wind erosion: Physical nail rusting: Ch…
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a solid substance looks uniformly brown. seen under a microscope, it lo…
B. a mixture
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part g which factor is important in making it possible to cool yourself…
Part G: E. (a), (b), and (c) Part H: it takes energy to break hydrogen bonds
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a compound is a pure substance that is composed of more than one type o…
D. Compounds have definite chemical compositions that can be described by chemical formulas.
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which of the following helps most to explain why water has a high speci…
A. A water molecule can make 4 hydrogen bonds.
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water has surface tension because... hydrogen bonds between surface wat…
For the first question: hydrogen bonds between surface water molecules resist being stretched. For the second question: (a) A water molecule can make 4 hydrogen bonds.
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which of the following is an example of a pure substance? a. salt b. wa…
D. all of these
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in the early 1900s, what trend emerged concerning chemical weapons? che…
Chemical weapons became deadly, as did other aspects of warfare.
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14. what physical property could be used to easily separate a mixture o…
C. density
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which of the following substances is an element? a. methane (ch4) b. br…
C. carbon (C)
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6. understanding chemistry is important for truly understanding homeost…
No specific examples can be provided without Eugene's story, but generally, regulation of blood glucose by the endocrine system is an example of the relationship between chemical …
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10 substance m is a blue, brittle solid. substance n is a colorless, fl…
D. There's no way to tell based on the information given.
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9 cations have positive charges. anions have negative charges. what for…
D. Electrostatic attraction
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8 atom a has seven electrons in its outer shell. atom b has one electro…
B. Ionic
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7 the relationship between the number of electrons in an atoms outer sh…
B. It refers to sets of eight.
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chemical bonds 1 quiz (graded) - 10 questions 6 an atom has 15 total el…
C. Five
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5 which of the following atoms is most likely to bond with another atom?
Without seeing the specific electron - shell details of each atom in the images (A, B, C, D), we cannot definitively choose an answer. However, in general, an atom with 1, 2, 3, 5…
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4 an atom with 10 electrons must have how many shells? a 1 b 2 c 8 d 10
B. 2
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3 which of these is an ion?
B.
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2 based on what you know about atomic structure, what can you infer abo…
A. It relates to protons and neutrons.
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1 if an atom has no charge, which of the following must be true? a it h…
C. Its number of protons is equal to its number of electrons.
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what does it mean that water is a super solvent? it is very, very good …
It can dissolve MANY substances
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electron configuration is the distribution of electrons in atomic orbit…
¿Por qué los elementos de la misma columna en la tabla periódica tienen configuraciones electrónicas de la capa exterior relacionadas y cómo afecta esto a sus propiedades químicas?
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5) there are several different measurements used for density. if you ha…
0.072 pounds per cubic inch
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which of the following types of medications are vials used to hold? cre…
Question 1: C. Liquid Question 2: B. Active ingredients, dosage form, route of administration, and strength
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2 multiple choice 20 points what does the atomic number tell you? the n…
The number of protons and electrons an atom contains
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multiple - choice question in adhesion, water molecules stick to each o…
stick to different substances.
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question 19 of 20 identify the type of bonding within each substance. c…
Co(s): B. metallic CoCl₂(s): C. ionic CCl₄(l): C. covalent
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question 18 of 20 solid matter held in place by electrostatic attractio…
D. metallic
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a pharmacy technician observes someone make a near - error in the pharm…
1. D. Talk to the pharmacist in a private setting. 2. It is the trademarked name given to a medication by the company (assuming the second option among the two provided for the se…
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question 16 of 20 the properties of several unknown solids were measure…
Ionic: B Molecular: D Metallic: C Covalent: A
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question 15 of 20 consider the table. | solid | triple point | normal m…
A
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interpreting graphics use the image below to answer the questions that …
6. Solid 7. Particles are held together by strong intermolecular forces.
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(b) what number, in addition to the answer to part (a), is needed to de…
Avogadro's number ($6.022\times 10^{23}$ atoms/mol)
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199.8831mol (b) what number in addition to the answer to part (a) is ne…
Avogadro's number ($6.022\times 10^{23}$ atoms/mol)
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question 14 of 20 ice floats on water. for most other substances, howev…
Water: - The solid is less dense than the liquid. - The molecules are closest in the liquid phase. - High pressure will cause the solid to become liquid. - In a phase diagram, the…
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2. a teacher records that a chemical smells like bananas. (1 point) qua…
# Breve explicación: - La sensación de olor es una característica cualitativa, ya que no se mide numéricamente. - Las puntuaciones de examen son datos cuantitativos, ya que son va…
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1. a researcher records the weight of a chemical. (1 point) qualitative…
Quantitative
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question 14 of 20 > ice floats on water. for most other substances, how…
Water: The solid is less dense than the liquid. Most other substances: High pressure will cause the liquid to become solid., The molecules are closest in the solid phase., In a ph…
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now, one thing you didnt mention was what you needed to control. you co…
It is challenging and takes hard work to complete.
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his friend marco stood on tiptoe. \i dont see her,\ he said. backing up…
He pays attention to details and enjoys exploring new angles of a project.
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d. 7.74 x 10^26 formula units al₂o₃ to moles answer: 1.29 x 10³ mol al₂…
$1.29\times 10^{3}$ mol $Al_{2}O_{3}$
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0.943 mole h₂o to molecules answer: 5.68 x 10²³ molecules h₂o
$5.68\times 10^{23}$ molecules $H_2O$
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multiple choice 1 point 17 which energy transfer model correctly shows …
Energy flows from water molecules to ice molecules.
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b. 50.4 g cabr₂ to moles answer: 0.252 mol cabr₂
$0.252\text{ mol}$
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18. fill in the rest of the chart.
| Ion/Isotope | Element Name | Atomic Number | Mass Number (P + N) | Protons | Neutrons | Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | $K^+$ | Potassium | 19 |…
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question 9 of 20 for liquids, which of the factors affect vapor pressur…
temperature, volume, intermolecular forces
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2. make each of the following conversions: a. 0.638 mole ba(cn)₂ to gra…
121 g
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15. effective nuclear charge is the relative force of attraction experi…
The formula for calculating the effective nuclear charge experienced by a valence electron is $Z_{eff}=Z - S$, where $Z$ is the atomic number (number of protons) and $S$ is the sh…
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question 8 of 20 the heat of vaporization for ethanol is 0.826 kj/g. ca…
$65047.5$
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14. which subatomic particle is identified by the atomic number? 15. wh…
14. Protons. 15. Neutrons have no electric charge. 16. They are isotopes. 17. Isotopes are atoms of the same element with different numbers of neutrons.
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1. (a) how many moles is 1.20 x 10²⁵ molecules nh₃ ( ammonia)? 19.9 mol…
(a) 19.9 mol (b) 338 g
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9. an isotope of uranium contains 92 protons and 146 neutrons. what is …
238
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question 7 of 20 arrange the compounds by boiling point. answer bank pe…
Highest boiling point: hexane Next: pentane Lowest boiling point: propane
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question 3 of 20 classify each substance based on the intermolecular fo…
Hydrogen bonding, dipole - dipole, and dispersion: $H_2O$ Dipole - dipole and dispersion only: $CH_3Cl$, $CO$ Dispersion only: $CH_4$
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what is the meaning of the word credulous as used in the passage? in jo…
B. easily fooled
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notes: changes in matter change - change in size or shape change - a ne…
- A precipitado forms when two solutions are mixed together. - Ejemplos de cambio de color: reacción entre hierro y ácido sulfúrico. - NO - Ejemplos de cambio de color: mezclar ag…
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8. write the chemical symbol for a magnesium ion with 12 protons, 12 ne…
$Mg^{2 + }$
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5 multiple choice 1 point which change in matter is an example of a pha…
Water evaporating into vapor
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notes: changes in matter change- change in size or shape change- a new …
1. Cambio físico 2. Cambio químico, re - organizados 3. Diferentes 4. Precipitado
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7. an oxygen atom has a mass number of 17 and an atomic number of 8. ho…
9
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notes: changes in matter change- change in size or shape change- a new …
- Cuando se forma una nueva sustancia en una reacción química, los átomos se reorganizan y las propiedades de la nueva sustancia son diferentes de las del reactivo original. - Un …
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change- change in size or shape change- a new substance is formed when …
1. Precipitado: Una precipitación se forma cuando dos soluciones son mezcladas y se forma un sólido insoluble. 2. Cambio en la temperatura: La temperatura aumenta o disminuye cuan…
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directions: decide if the change is chemical or physical. then color th…
- Chemical: Iron Rusting, Food Rotting, Baking a Cake, Fireworks, Burning Fire, Digesting Food, Cooking Chicken - Physical: Saltwater, Chopping Wood, Oil and Water, Temperature Ch…