Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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the molecule shown here contains four functional groups. choose the opt…
(No answer can be provided as the image is unclear and the highlighted atoms in each option cannot be properly discerned. If the options were clear, we would analyze each one to i…
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students will be able to demonstrate their knowledge of the states of m…
Solid: Has definite shape and volume, molecules closely - packed with low kinetic energy. Liquid: Has definite volume, takes shape of container, molecules can slide past each othe…
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fill in the blank with the correct term that you learned from your stud…
1. Fibrillation 2. Double - insulated/ungrounded tools 3. Polychlorinated biphenyls (PCBs) 4. Ground fault circuit interrupter (GFCI) 5. Error precursors 6. Grounded tool 7. Quali…
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which molecules show an appropriate number of bonds around each carbon …
The first, second, and fifth structures.
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which molecules show an appropriate number of bonds around each carbon …
All of the given structures show appropriate number of bonds around each carbon atom.
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select the significant figures in the measurement 25.00 grams
4
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fill in the blank question surface tension of water is created by , whi…
cohesion
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these molecules are _. amines thiols enantiomers structural isomers cis…
C. enantiomers
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perform the calculation. 14.0230 g ÷ (58.44 g/mol × 0.1000 l) write you…
$2.400$
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perform the calculation. 1.2 cm × 2.0 cm × 7.6 cm write your answer wit…
$18\ cm^{3}$
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the energy needed to get a reaction started is called the (1 point) coh…
activation energy
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identify the reactant(s) in the chemical reaction, co₂ + h₂o → h₂co₃. (…
A. $\mathrm{CO_2}$ and $\mathrm{H_2O}$
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perform the calculation. 3.5 atm × 13.05 l ÷ 0.50 atm write your answer…
91
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when hydrogen and oxygen combine to form water, water is a(n) (1 point)…
B. a product
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in chemical reactions, atoms are o destroyed o rearranged o created
B. rearranged
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perform the calculation. 0.75 atm × 210 k ÷ 315 k write your answer wit…
$0.5$ atm
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perform the calculation. 7.25 g ÷ (98.15 g/mol × 0.150 l) write your an…
$0.492\ mol/L$
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how does frost use irregular blank verse to affect the language of his …
Frost makes the language sound like everyday speech through irregular blank verse.
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using science skills element symbol protons neutrons electrons atomic n…
30. 12 31. 1 32. 13 33. Helium
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perform the calculation. 0.025 l × 0.5000 mol/l × 84.314 g/mol write yo…
1.1 g
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perform the calculation. 6.0 j ÷ (10.1 g × 4.7 j/g°c) write your answer…
$0.13$ °C
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why is carbon so special compared to other elements? ethane c₂h₆ ethene…
Carbon atoms can bond to one another and form a lot of different structures.
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beryllium has an atomic number of 4. how many neutrons does the isotope…
5
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there are three stable forms of neon: neon - 20, neon - 21, and neon - …
Their atomic masses differ.
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rubidium has an atomic number of 37 and a mass number of 85. how many p…
37 protons, 48 neutrons, and 36 electrons
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an element has an atomic number of 16. an ion of this element has a 2 -…
A. A neutral atom gained 2 electrons.
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complete the following chart on subatomic particles. subatomic particle…
19. +1 20. 1 amu 21. nucleus 23. 0 24. 1 amu 25. nucleus 27. -1 28. $\frac{1}{1836}$ amu 29. electron - cloud outside the nucleus
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which statement describes the number of protons in each atom of an elem…
The number of protons is given by the atomic number, which increases by one moving from left to right across each row of the periodic table.
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2) complete the following, writing your answer in standard scientific n…
a) Volume of metal: 6.5 ml b) Density of metal: 4.67 g/ml c) Percent error: 3.78%
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chemistry atomic structure practice i x = element symbol a = mass numbe…
| Name | Symbol | Z | A | #p | #e | #n | Isotopic Symbol | |---|---|---|---|---|---|---|---| | Sodium | Na | 11 | 23 | 11 | 11 | 12 | $^{23}_{11}Na$ | | Chlorine | Cl | 17 | 35 | …
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atoms, elements, compounds & molecules figure 1. figure 2. the particle…
Each particle in Figure 1 is a molecule. Figure 1 represents an element because all particles are identical molecules made of the same - type atoms. Each particle in Figure 2 is a…
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16. which substance is electrically neutral? substance # of protons # o…
16. a. Lithium 17. a. X is ionic; Y is covalent
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scientific notation 2) complete the following, writing your answer in s…
a) $9.18\times10^{-3}$ b) $7.54\times 10^{5}$ c) $1.01325\times 10^{4}$ d) $8\times10^{14}$ e) $3\times10^{5}$
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what separation technique is used to separate a dissolved solid from th…
# Breve explicación: La evaporación es la técnica que se utiliza para separar un sólido disuelto de un líquido. En la evaporación, se calienta la solución para que el líquido se e…
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10. the most abundant compound in most living things is a. carbon dioxi…
10. b. water 11. d. solvent 12. a. 4.22 13. a. An acid 14. d. preventing a lake from freezing solid 15. c. 8
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your one - pager must include: - a title (what is the unit we are study…
a) 0.06 kg b) 2 L c) 7607 mm d) 450 ms
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what separation technique involves passing a liquid through a material …
# Breve explicación: La filtración es una técnica de separación que implica pasar un líquido a través de un material con poros pequeños que permiten que algunas sustancias pasen a…
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complete the sentence using one of the following words: chromatography,…
evaporación
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6co₂ + 6h₂o → c₆h₁₂o₆ + 6o₂ in a chemical equation, what do we call the…
B. Reactant
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6co₂ + 6h₂o → c₆h₁₂o₆ + 6o₂ in a chemical equation, what do we call the…
A. Product
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which method of separation would be most effective to achieve the follo…
# Explicación breve: La filtración es una técnica de separación que se utiliza para separar un sólido de un líquido. En el diagrama, se muestra una mezcla de un líquido (A(l)) y u…
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in which of the following ways would one separate a miscible solution o…
# Explicaciones breves: La distilación es una técnica común para separar mezclas miscibles de líquidos con diferencias en puntos de ebullición. Benzeno y cloroformo son líquidos m…
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1. the three particles that make up an atom are a. protons, neutrons, a…
1. Protons, neutrons, and electrons 2. Electrons 3. Protons and neutrons 4. 11 5. Two atoms of hydrogen and one atom of oxygen 6. Sharing an electron pair 7. Valence 8. Positive 9…
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complete the sentence using one of the following words: chromatography,…
# Breve explicación: La cromatografía es una técnica que separa componentes de una mezcla en diferentes velocidades a medida que pasan a través de un medio. La destilación se basa…
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in the sandwiches mode, select the \cheese\ option and observe the equa…
- 6 bread slices and 4 cheese slices: Bread is the limiting ingredient - 4 bread slices and 1 cheese slice: Cheese is the limiting ingredient - 8 bread slices and 5 cheese slices:…
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part d find the number of moles of water that can be formed if you have…
164 mol
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in the sandwiches mode, select the \cheese\ option and observe the equa…
20
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the reaction between nitrogen and hydrogen to form ammonia is carried o…
For Part A: 37.1 g $NH_3$ For Part B: 87.3%
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a reaction was conducted between barium nitrate and sodium phosphate. 3…
$95\%$
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magnesium burns in air with a dazzling brilliance to produce magnesium …
E. 9.12
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part a if the percent yield for the following reaction is 75.0%, and 40…
$27.4\ g$
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how many grams of h₂ are needed to produce 13.56 g of nh₃? express your…
2.39 g 5.56×10^{19} molecules
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9. which type of mixture is mayonnaise * homogeneous heterogeneous 18. …
A. Homogeneous
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e. a pure substance made up of two or more elements that are chemically…
compound
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which of the following statements does not apply to a compound? a. it i…
C. It can be separated into components by physical methods.
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a ______________ is a pure substance made up of two or more different k…
D. compound, atoms
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in a solution, water molecules interact with solute particles, allowing…
C. Hydrogen bonds
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complete este cuestionario para finalizar la tarea de química moderna q…
Siguiendo todas las reglas de seguridad del laboratorio
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chemical reactions reactants vs products eactants yield products\ is a …
C. Light
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e. a pure substance made up of two or more elements that are chemically…
E. compound F. distillation G. homogeneous mixture (not listed in options but for clarity) H. heterogeneous mixture (not listed in options but for clarity)
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complete este cuestionario para finalizar la tarea de química moderna q…
# Breve Explicación: - El desechar desechos químicos según las instrucciones del maestro ayuda a evitar contaminación y riesgos químicos. - El usar gafas protectoras protege los o…
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complete este cuestionario para finalizar la tarea de química moderna q…
D. cilindro graduado
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find the correct amount! if you have 100 kg of a steel alloy that is 94…
Iron: 94 kg Carbon: 5 kg Chromium: 1 kg
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ph measures the acidity of a substance, and is described by the equatio…
$7.3$
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complete este cuestionario para finalizar la tarea de química moderna q…
Ninguna de las opciones es correcta. La precisión en un laboratorio de química se refiere a la reproducibilidad de una medición, es decir, que al realizar la misma medición múltip…
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let’s calculate bronze is an alloy of copper and tin. we know that bron…
176 kg of copper and 24 kg of tin
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ph measures the acidity of a substance, and is described by the equatio…
The pH of the substance is approximately $3.40$ and the substance is acidic.
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which element shares similar properties with titanium (ti)? calcium (ca…
Zirconium (Zr)
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3. draw a venn diagram comparing physical and chemical properties. on e…
Volume of copper: 5 ml Mass of copper: 44.8 g
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the bond holding two water molecules together is a(n) blank bond.
hydrogen
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one pager (formative assessment - due the day of the test) a one pager …
Volume of copper: $5ml$ Mass of copper: $44.8g$
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ph measures the acidity of a substance, and is described by the equatio…
7
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true or false question a water molecule is polar because the opposite e…
True
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ph measures the acidity of a substance, and is described by the equatio…
The pH of the substance is 2 and it is acidic.
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ph measures the acidity of a substance, and is described by the equatio…
A. \(3.16\times10^{-6}\)
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ph measures the acidity of a substance, and is described by the equatio…
D. $3.63\times10^{-8}$
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find the ph of a solution if the hydrogen - ion concentration, h⁺, is 4…
A. 5.4
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multiple - choice question ionization energy ______ down a group becaus…
C. decreases
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the following unbalanced chemical equations are provided in the phet si…
For Combust Methane ($CH_4 + 2O_2 ightarrow CO_2+2H_2O$): Carbon is balanced, Hydrogen is balanced, Oxygen is balanced. For Separate Water ($2H_2O ightarrow 2H_2 + O_2$): Hydrogen…
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multiple - choice question ionization energy ______ across a period inc…
increases because atom is smaller
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1. a chemical change is shown in the picture below. name three signs th…
1. Three signs of a chemical change in the rusting of the car: Color change, formation of a new substance (rust), and potential heat/light change (less obvious in rusting). 2. Gla…
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5. reactivity, as a chemical property, refers to the ability of a subst…
D. Undergo a chemical reaction with another substance
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which of the following purely forms ionic compounds only a (nh4)cl b cl…
A. $(NH_4)Cl$
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valence electrons carbons versatility stems from its ability to form fo…
B. organic compounds
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9. when iron (fe) reacts with hydrochloric acid (hcl), hydrogen gas (h₂…
The chemical properties of iron allow it to displace hydrogen from the acid.
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total number of fe atoms in this sample of 122 g fe2o3 is is 9.15x 10^2…
False
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7. consider the following unbalanced chemical equation: mg(s) + o₂(g) →…
7. B. Reactants 8. B. Different from the properties of both magnesium and oxygen.
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q1 chemistry: u2l3 isotopes prework part 2: average atomic mass directi…
24.3202 amu
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5. reactivity, as a chemical property, refers to the ability of a subst…
5. Undergo a chemical reaction with another substance. 6. Reactivity
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3. flammability is a chemical property that describes a substances abil…
3. Undergo combustion in the presence of oxygen. 4. Methane (CH₄)
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solvent and solute compared to a solution what is the term for the subs…
A. solvent
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1. which of the following is the best example of a chemical change? ice…
1. A metal nail rusting when exposed to air and moisture. 2. A gas is produced when two solutions are mixed.
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multiple choice question water can dissolve more things than any other …
A. universal
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multiple - choice question why do smaller atoms have a higher ionizatio…
the valence electrons are closer to the pull of the protons in the nucleus
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in the given question on fe2o3, the number of moles of fe atoms is ___ …
C. 1.525, 2.29
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question 10 of 10 pure liquid water has a ph of 7, which means that wat…
B. neutral
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the more an element is in the internal part of the periodic table, it w…
False
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1. *complete the table below based on the models provided. number of pr…
4. A, C, D 5. A 6. C 7. B 8. C 9. No, two atoms with the same mass number cannot be isotopes of each other. Isotopes have the same number of protons but different mass numbers due…
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what two things need to be studied in order to develop a new drug? 5 po…
B. The body and the disease
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multiple choice question during the melting of ice, the added heat ____…
D. breaks hydrogen bonds