Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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part 2 (1 point) the average single and double n - o bond lengths are 1…
Part 2: 129 pm Part 3: No
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describe how to do percent by mass by completing the following paragrap…
The percent - by - mass of a compound is equal to the sum of the masses of the elements that make up the compound. This demonstrates the law of definite proportions.
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get it? state the law of definite proportions. analyze the law of defin…
1. Identical compounds 2. Different compounds
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describe how to do percent by mass by completing paragraph. the ______ …
The percent by mass of a compound is related to the masses of the elements that make up the compound. This definition is based on the concept of the relative amounts of elements i…
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describe how to do percent by mass by completing the following paragrap…
The **percent - by - mass** of a compound is **equal** to the **ratio** of the **mass of an element** that make up the compound to the **total mass** of the compound. This demonst…
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exercise 4.30 - enhanced - with feedback and hints consider the followi…
2, 6, 8
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part b determine how many moles of ba(oh)₂ are required to completely n…
0.2125
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lesson 7: valence electrons & lewis electron dot diagrams unit 2: atomi…
- Core Electrons in Silicon: 10 - Valence Electrons in Silicon: 4 - Core Electron Interpretation: Inner - shell electrons, tightly bound to nucleus, not directly involved in chemi…
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when radioactive phosphorus releases beta radiation, what element is pr…
A. Sulfur
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an atom has an atomic number of 13. what type of element is the atom? a…
A. Aluminum
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2 atoms of the same element have different amounts of neutrons. these a…
C. isotopes
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according to the bohr model, electrons are only found in specific orbit…
C. Energy Levels
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who is the scientist who proposed the \solar system\ model of an atom w…
C. Niels Bohr
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snc2p chemistry putting it all together... ionic and molecular compound…
| Chemical Formula | Chemical Name | Ionic (I) or Molecular (M) | |---|---|---| | MgO | Magnesium oxide | I | | CCl₄ | Carbon tetrachloride | M | | NaBr | Sodium bromide | I | | L…
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part d how many molecules (not moles) of nh₃ are produced from 8.06×10⁻…
$1.61\times 10^{20}$
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get it? summarize how the properties of a compound and the properties o…
The properties of a compound are different from the properties of its component elements because chemical combination creates new substances with unique bonds and structures.
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jeffrey is sending a fancy organic fruit basket to his grandmother for …
$2.83x + 2.21y<35$
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compounds (continued) discuss elements and compounds by completing the …
Oxygen; compounds; thousands; year
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all matter is made of what compounds energy electrons atoms
D. atoms
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bell ringer: 1. sodium is in group 1 on the periodic table. which state…
1. cation with a +1 charge 2. anion with a -1 charge
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this number gives the number of protons in each atom of an element. ato…
atomic number
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discuss elements and compounds by completing the following paragraph. t…
Oxygen; compounds; thousands; year
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in daltons atomic theory, all elements consist of ____________ that can…
A. Atoms
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15) find the volume of 0.110 mol l⁻¹ hydrochloric acid necessary to rea…
A. 0.531 L
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which statement is not true about an atoms nucleus? it is positively ch…
It contains most of the volume of the atom.
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which model of the atom proposed that atoms were positive spheres with …
B. Plum Pudding Model
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which model is this? thomson model rutherford model bohr model cloud mo…
A. Thomson Model
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to change ca to ca+2, you need to: remove 2 electrons add 2 protons rem…
remove 2 electrons
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what must be true for all atoms? protons equal electrons protons equal …
protons equal electrons
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what is matter and what is it composed of? give an example
Matter is anything with mass and volume, composed of atoms. Example: water.
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which scientist developed the plum pudding/chocolate chip cookie model?…
B. Thomson
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vocabulary: covalent bond, diatomic molecule, lewis diagram, molecule, …
They can exchange the markers they are missing. 2.
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section 1 - electron configurations (4 points each) use noble gas notat…
1. Class: Non - metal; Valence Electrons: 4; Electron Configuration: $[He]2s^{2}2p^{2}$ 2. Class: Halogen; Valence Electrons: 7; Electron Configuration: $[Kr]4d^{10}5s^{2}5p^{5}$ …
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draw the lewis structure for phosgene (cocl₂). you do not need to provi…
 (The Lewis structure has a carbon atom in the center, double - bonded to an oxygen atom and single - bonded to two …
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for each of the following sets of elements, identify the element expect…
For K, Sc, Ca: Cross out K, circle Sc. For Br, F, At: Cross out At, circle F. For C, O, N: Cross out C, circle O.
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chemical bonding draw an illustration that would demonstrate the covale…
Draw O=O for the covalent - bond illustration and place an "x" at point R on the graph.
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ionic vs. covalent properties now that you know the different propertie…
1. C 2. I 3. I 4. C 5. C 6. C 7. I 8. I 9. C 10. I
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ionic vs. covalent properties now that you know the different propertie…
# Brief[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][LLM SSE On Failure]
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b. sulfur - 34 (z = 16)
18
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olivia observes bubbles while boiling water and concludes that this is …
I disagree, because the water molecules do not change.
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question 16 (1 point) changes in cerebrospinal fluid ph are detected by…
(16) D. chemoreceptors (17) B. Brain (18) None of the above (savory meats produce umami taste - not listed in options)
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2) if an isotope of uranium has 92 protons (z = 92) and 143 neutrons, w…
2) 235 3) a. 20
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calcium oxide and carbon dioxide combine to form calcium carbonate in t…
Calcium carbonate and calcium oxide are formed at the same rate.
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unit 2: atoms and isotopes directions: answer each question completely.…
235 (Note: For the first - part of drawing the atom model, it is a visual task. A simple way is to draw a small circle in the center to represent the nucleus where protons and neu…
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pregunta 1 de 10 ¿qué característica debe tener un isótopo utilizado pa…
D. Debe tener una vida media cercana a la edad del objeto que se está datando.
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¿qué es un radioisótopo? a. un isótopo que es radiactivo b. un isótopo …
# Breve Explicación: Los radioisótopos son isótopos que son radiactivos, es decir, tienen núcleos atómicos inestables que emiten partículas y radiación al desintegrarse. # Respues…
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pregunta 1 de 10 ¿qué mide la energía de enlace? a. las fuerzas que atr…
D. La energía utilizada para mantener unido el núcleo.
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which statement accurately describes nuclear fission? (1 point) fission…
Fission is a process in which a large nucleus is split into smaller nuclei.
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hydrochloric acid and sodium hydroxide react to produce water and sodiu…
More bond energy is absorbed on the reactants side than is released on the products side.
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when iron pipes come in contact with water and oxygen, iron transfers e…
Oxygen is reduced, and iron is oxidized.
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physical science a semester exam use the generalized equation to answer…
single replacement
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which generalized equation represents a double - replacement reaction? …
D. \(AB + CD ightarrow AD + CB\)
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molecules that are made up of two of the same atom have nonpolar covale…
The atoms have the same electronegativity.
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under certain conditions, water can be separated into oxygen and hydrog…
Student B, because of the law of conservation of matter.
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which is a sentence fragment? is an expert at distinguishing safe mushr…
Is an expert at distinguishing safe mushrooms from poisonous ones.
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how is an atom of the element xenon (xe) likely to act during a chemica…
It will likely be unreactive.
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06 question (1 point) nitrogen trifluoride, nf₃, is used in the electro…
The Lewis structure has N in the center with single - bonds to three F atoms. Each F atom has 3 lone - pairs and N has 1 lone - pair.
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which comparison is correct? (1 point) o h₂s is a stronger acid than hc…
$PH_3$ is a stronger acid than $NH_3$.
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which statement best describes a weak base? (1 point) it accepts proton…
It accepts protons and only partially dissociates in water.
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how do temperature changes lead to solubility changes for salt dissolve…
High temperatures mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility.
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which example accurately describes a solution? (1 point) ○ polar sugar …
Polar sugar molecules dissolve in water, which is polar.
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answer the following. (a) a certain solution has a hydrogen ion concent…
(a) $9.14\times10^{-5}$ moles per L (b) 9900 pounds
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a person is drinking a glass of soda with ice. which option describes t…
in: least and intermediate energy above: greatest energy
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which of the following elements are most likely to form an ionic bond? …
K and Cl
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physical science a semester review and exam physical science a semester…
dark gray circles
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hydrogen is in group 1 of the periodic table. which kind of bond would …
A. A covalent bond would form because the electron would be shared so both hydrogens have a full, stable shell.
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physical science a semester exam how did the study of the atom contribu…
Experiments that identified characteristics of atoms provided scientists with atomic weights and atomic numbers, which were used to organize the periodic table.
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10 multiple choice 1 point what is the main difference between the gas …
C. Liquid water has much less space in between its molecules than water vapor does.
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¿qué información proporciona una prueba de llama? a. el espectro de abs…
D. El espectro de emisión de un elemento
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dysentery is an: a inflammation of the intestine caused by ingesting wa…
A. Inflammation of the intestine caused by ingesting water or food containing chemical irritants, bacteria, or parasites; results in bloody diarrhea
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14.calculate the average atomic mass for oxygen. isotope information is…
$15.999$ amu
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isotopes lt: i can determine mass number from number of neutrons and vi…
| Isotopic Notation | Mass Number | Atomic Number | Protons | Neutrons | Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | \(^{22}_{10}Ne\) | 22 | 10 | 10 | 12 | 10 | | \(…
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why? how do atoms combine to make different types of matter? look at th…
1. a. (Student needs to circle another RSq molecule in the model). b. 2 2. a. 3 b. 2 3. a. 3 b. 2 4. Chemical bond 5. a. Yes b. Yes c. 3 d. A single atom, a molecule, or a small s…
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investigative phenomenon: claim - evidence - reasoning discuss the phen…
1. Question: Why did the chemical reaction occur at that rate in the video? 2. Make a Claim: The reaction rate was high because of the high concentration of reactants. Cite Eviden…
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match the reactants with the products. copper sulfate + oxygen copper +…
aluminum + copper chloride → aluminum chloride + copper copper + oxygen → copper oxide copper oxide + hydrogen → copper + water copper sulfate + zinc → zinc sulfate + copper
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drag the tiles to the correct boxes to complete the pairs. not all tile…
aluminum + copper chloride $ ightarrow$ aluminum chloride + copper copper + oxygen $ ightarrow$ copper oxide copper oxide + hydrogen $ ightarrow$ copper + water copper sulfate + z…
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13) define niche using an example from the story. * your answer
A niche is a specialized market segment. In a story about a coffee shop, offering organic, fair - trade coffee to environmentally conscious locals is an example of a niche.
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select the correct answer. samuel adds a teaspoon of salt to a glass of…
B. It's a physical change because the water and the salt kept their original properties.
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select the correct answer. what kind of chemical reaction does the chem…
D. synthesis
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select the correct answer. iron oxide reacts with aluminum to give alum…
C. replacement
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drag each chemical equation to the correct location. sort the chemical …
Synthesis: iron + oxygen → iron oxide, sulfur + oxygen → sulfur dioxide, sodium + chlorine → sodium chloride, potassium + chlorine → potassium chloride Decomposition: water → hydr…
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question select the correct answer from each drop - down menu. complete…
The reaction when a compound breaks down: Decomposition The reaction when two substances combine to form one product: Synthesis The reaction involving replacement of atoms: Replac…
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question select the correct answer from each drop - down menu. complete…
1. Combustion 2. Decomposition 3. Synthesis 4. Replacement
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atomic structure are found in the nucleus of the atom they have a charg…
# Explicación detallada: ## Paso 1: Partículas en el núcleo Los protones y neutrones se encuentran en el núcleo del átomo. Los protones tienen una carga positiva (+1) y una masa d…
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multiple - choice question how many oxygen atoms in each water molecule…
1. 1
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question select all the correct answers. which actions show that mixing…
- purifying water with a carbon filter - a soda fizzing when its cap is opened - a metal mixed with a very small amount of a nonmetal to make a metallic alloy
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which material forms the organic portion of soil? clay water dead plant…
dead plants
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1.) read the following and answer the questions below: the dead sea and…
a. Salt is the solute because it is the substance dissolved in water. b. Water is the solvent because it is the substance that dissolves the salt. c. 34.2% d. 0.7%
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besides cooling towers, what other methods are used to cool the water t…
spray and cooling ponds
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question select all the correct answers. which observations show that a…
Overnight, dew forms on the grass.
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what is the relationship between heat and dissolved oxygen? inverse rev…
inverse
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why is seawater not classified as a pure substance? a) samples taken fr…
B. Samples taken from different locations vary in composition.
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an orange - colored solid is heated in a bunsen burner flame to produce…
B) compound
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which is an example of a chemical change? a) grill marks forming on a h…
A. grill marks forming on a hamburger being barbequed
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which substance is a vapor at room temperature and standard atmospheric…
A. gasoline
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which is a chemical property of copper? a) has a boiling point of 2567 …
B. reacts in air to form a green layer
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select the correct answer. a scientist compares two samples of colorles…
D. Density calculations show that the gases are different, so a chemical reaction occurred.
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the chemical equation for the reaction of sodium metal with water is 2n…
B) 31 g
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part e what word chemical equation describes cavendishs experiment with…
Zinc + Acid → Hydrogen + Zinc - salt
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50 ml of vinegar and 2 g of baking soda are added to flask. the flask i…
A. more than 52 g