Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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what ion is a component of atp, one of the most important energy carrie…
$PO_{4}^{3 - }$
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neutral atoms that gain electrons become ________ select the correct an…
C. anions
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what is a cation? select the correct answer below: an atom that has los…
an atom that has lost electrons
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question what is the difference in the number of electrons between the …
2
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elements in group 17 will tend to form ions with a charge of ________. …
C. 1−
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question 25 of 28. why do elements in the same group tend to have simil…
C. They have the same number of valence electrons.
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question use the periodic table below to answer the question that follo…
B. 2+
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question 24 of 28 which of the following tools do you need in order to …
C. A balance and a graduated cylinder
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question 22 of 28. which of the following tend to take on electrons in …
B. Nonmetals
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this painting is by pablo picasso, entitled the blind mans meal. what t…
b. He used a monochromatic color scheme, which occurs when one color predominates, shades of black, tints of white, values of a hue.
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question 20 of 28 which of the following is true of elements in the sam…
C. They are likely to have similar chemical properties.
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question 18 of 28 when is an atom most stable? a. when it has 2 electro…
D. When its outermost electron shell is full
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question 15 of 28 what is temperature? a. a measure of how hot or cold …
A. A measure of how hot or cold something is
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research worksheet: ionization energy and electron affinity in this res…
1. Ionization energy: The energy needed to remove an electron from a gaseous atom/ion. 2. Becomes a positively - charged ion (cation). 3. Helium; due to small size and stable conf…
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question 12 of 28 elements in which family are most likely to have prop…
B. Transition metals
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question 11 of 28 which of the following best describes the charge of t…
A. The nucleus always has a positive charge
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question 8 of 28 how does conduction transport heat through a steel rod…
D. Energy spreads from one end of the rod to the other through molecular collisions.
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question 7 of 28 which of the following groups contains elements that a…
B. Noble gases
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question 6 of 28 sodium metal reacts with chlorine to produce salt. neo…
D. Chemical property
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question 9 of 28 which best explains how dmitri mendeleev organized ele…
B. Elements with similar properties were grouped together.
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the diagram shows the major divisions of the periodic table. which of t…
A. Both B and C
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question 2 of 28. the diagram shows the major divisions of the periodic…
A. Transition elements
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question 1 of 28. which particles in an atom are found outside the nucl…
C. Electrons
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why is it incorrect to use the value 12.01 when calculating the number …
It is not a whole number
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what is the atomic mass of carbon - 12? 16 18 14 12
12
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which of the following elements has an atomic number of 12? zinc magnes…
B. Magnesium
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what is the atomic number of an element? the number of neutrons in the …
The number of protons in the nucleus
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carbon has an atomic number of and a mass number of drag these tiles an…
Atomic number: 6, Mass number: 12
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what is the definition of isotopes? atoms with different numbers of pro…
C. Atoms with the same number of protons but different numbers of neutrons.
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4c₃h₅n₃o₉ → 12co₂ + 6n₂ + o₂ + 10h₂o 2.50 kg of nitroglycerin detonates…
The mass of $CO_2$ produced is $1.45\ kg$ and the mass of $H_2O$ produced is $0.496\ kg$.
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what is the relative abundance of carbon - 12 in a naturally occurring …
D. 99.99%
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which isotopes of carbon are naturally occurring? carbon-13 and carbon-…
C. Carbon - 12 and Carbon - 13
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why might atomic models be useful for students? they allow students to …
They help students understand the structure of atoms
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what does the atomic mass of an element represent? the number of proton…
The average mass of all the isotopes of an element.
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recitation week 4 (rw4) chem 2510 dr. chang 8. for the given cyclohexan…
Newman projection and flipped chair conformation are drawn as per instructions. Keq for OH - substituted cyclohexane is approximately $0.36$. The percentage of axial form is appro…
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2. encercle lisotope de lélément fictif $_{130}^{280}$pou (2 points) : …
$\ce{^{282}_{130}Pou}$
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what do you predict will happen to the concentration of free water mole…
Decrease
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law of conservation of mass—mass ________ be ________ ________ ________.
cannot; created; or; destroyed
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23. honey is composed mostly of the sugars glucose and fructose. what p…
23. C. Water is a polar molecule and so is honey. 24. A. Adhesion 25. D. The Hydrogen end is positive and the Oxygen end is negative. 26. A. Ice is denser than liquid water 27. A.…
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10. les isotopes dun élément sont des atomes qui ont le même nombre de …
protons, neutrons, masse atomique
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part a. stoichiometry given the reaction: 2 c₈h₁₈ + 25 o₂ → 16 co₂ + 18…
- Grams of O₂ used in C₈H₁₈ combustion: 87.6 g - Grams of CO₂ produced in C₈H₁₈ combustion: 77.1 g - kg of CO₂ produced in nitroglycerin detonation: 1.45 kg - kg of H₂O produced i…
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9. remplir le tableau suivant pour les ions suivants : (7 points) * ass…
# Explications étape par étape: ## Étape 1: Compléter le tableau pour le bore Le bore (B) a un numéro atomique de 5. En perdant 3 électrons, il forme un cation $B^{3 +}$. Le nombr…
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phase changes are ______________ ______________ freezing point— _______…
PHASE CHANGES ARE TRANSITIONS BETWEEN STATES OF MATTER freezing point—LIQUID to SOLID melting point—SOLID to LIQUID MELTING point = FREEZING point boiling point—LIQUID to GAS cond…
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phases of matter solids shape ___ volume particles ___ liquids shape __…
Solids: definite, definite, closely - packed Liquids: indefinite, definite, move past each other Gases: indefinite, indefinite, widely - spaced Physical change: change, physical p…
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definitions of properties physical properties can be ____________ witho…
Physical properties can be **observed or measured** without **changing the identity of** matter. Chemical properties describe how a **substance undergoes a chemical change or reac…
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6. dessine le modèle de bohr - rutherford (court) : (4 points) 19k 7. q…
6. Impossible de dessiner dans ce format. 7. 84 (en considérant l'isotope le plus abondant) 8. 19 9. | Nom de l'élément | Symbole de l'ion | Anion ou cation ? | Donné ou gagné des…
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write formulas for the following: nitric acid chloric acid acetic acid …
| Acid Name | Formula | |--|--| | Nitric acid | $HNO_3$ | | Chloric acid | $HClO_3$ | | Acetic acid | $CH_3COOH$ | | Hydrobromic acid | $HBr$ | | Sulfurous acid | $H_2SO_3$ | | Ch…
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question 10 (1 point) which of the following is the correct noble gas n…
A. [Ne] 3s²
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question 6 (1 point) what is the highest energy level (valence shell) a…
A. $4s^{2}$
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question 7 (1 point) how many electrons does a neutral atom of oxygen h…
A. 8
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question 5 (1 point) which is the correct electron configuration for th…
A. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
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5. dessine la notation de lewis des éléments suivants : (3 points) a) b…
# Explications succinctes: Pour le brome (Br), il est dans le groupe 17 de la classification périodique et a 7 électrons de valence. On représentera le symbole du brome au centre …
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question 4 (1 point) which of the following is the correct noble gas no…
B. [Ar] 4s²3d⁶
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question 3 (1 point) which of the following is an incorrect way to writ…
A. 1s²2s¹2p⁶
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2. encierra en un círculo el isótopo del elemento ficticio 180pou (2 pu…
1. Pas de réponse précise pour l'isotope fictif. 2. Moseley : numéro atomique croissant ; Mendeleev : propriétés chimiques et masse atomique approximativement croissante. 3. $1s^{…
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nacl and kbr are ionic compounds. h₂o and c₆h₁₂o₆ are covalent compound…
B. Ionic compounds have higher melting points than covalent compounds. Ionic compounds are composed of a metal and a nonmetal while covalent compounds are composed of all nonmetal…
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practice directions: identify whether the following substances are held…
2. Covalent 3. Ionic 4. Covalent 5. Ionic 6. Ionic 7. Ionic 8. Covalent 9. Covalent 10. Covalent
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cas + hcl → acl₂ + h₂s
1
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calcium forms the cation ca²⁺. which model can be used to represent the…
We cannot provide the answer as the options (A, B, C, D) are not clearly visible in the provided image. Please describe the electron - dot models in each option for a proper respo…
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how many valence electrons does an atom of the element neon (ne) have? …
C. eight
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fluorine (f) is a nonmetal. it has a strong tendency to complete its ou…
A. It will gain one electron and form F⁻.
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this is a 2 points chem cup erlenmyer flask beaker graduated cylinder c…
C. beaker
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question 10 (1 point) which group will have an electron configuration t…
A. Alkaline earth metals (Group 2)
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question 9 (1 point) which is the correct electron configuration for th…
B. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
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question 8 (1 point) which of the following is an incorrect way to writ…
A. 1s²2s¹2p⁶
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marie curie arrives in paris when marie curie arrived in paris in septe…
1. b. "Curie once thought of quitting but never did" 2. d. To inform readers of Curie's early challenges and resilience
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question 7 (1 point) what is the highest energy level (valence shell) a…
D. 4s²
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atoms: inside out label the parts ii. place the correct letter(s) in th…
1. A is neutron, D is nucleus, in a neutral atom, protons and electrons have the same number, C is proton, B is electron. 2. The element in the diagram is carbon. Its mass number …
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question 6 (1 point) which of the following is the correct noble gas no…
C. [Ne] 3s²
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calculate the atomic weight: 75% have a mass of 5g 25% have a mass of 1…
$7.5$ g
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li₃po₄ → li + p + o₂ cs₂ + f₂ → cf₄ + s fe + cl₂ → fecl₃
Balanced equations: $\mathrm{Li_3PO_4}\to3\mathrm{Li}+\mathrm{P}+2\mathrm{O_2}$ $\mathrm{CS_2}+2\mathrm{F_2}\to\mathrm{CF_4}+2\mathrm{S}$ $2\mathrm{Fe}+3\mathrm{Cl_2}\to2\mathrm{F…
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question 3 (1 point) what is the correct noble gas notation for gallium…
Question 3: $[Ar]4s^{2}3d^{10}4p^{1}$ Question 4: 8
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question 1 (1 point) which of the following is the correct noble gas no…
Question 1: B. [Ar]4s²3d⁶ Question 2: D. d orbital
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4. which of the following elements has the most metallic properties? ni…
Cs
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examine the data table below and use the data to answer questions 5 - 9…
5. b) Atom A and atom C 6. d) Beryllium - 7 7. E 8. C
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mookie has a solution of ph 6 and keebo has a solution of ph 3. keebo s…
No, Keebo is wrong. Keebo's solution has 1000 times the hydrogen - ion concentration of Mookie's solution, not double, as calculated from the pH formula $pH = -\log[H^+]$.
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complete each row of the table below by filling in the missing prefix o…
| Missing Prefix/Exponent | Value | |--|--| | Prefix for $10^{-6}$ | $\mu$ (micro) | | Prefix for $10^{6}$ | M (mega) | | Exponent for $1\ d\ \text{mol}$ | $-1$ | | Exponent for $…
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use the periodic table to identify the element indicated by each electr…
Ne P K Ni Tc
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what are valence electrons? . electrons found in the outermost energy l…
First atom: Element Name: Carbon, Valence Electrons: 4 Second atom: Element Name: Oxygen, Valence Electrons: 6
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which change is likely to happen to an atom of the element strontium (s…
It will give up electrons, forming a positive ion.
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use the phase diagram of substance x below to find the temperature at w…
300 K
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water cycle review part 1: a water molecules journey. using the startin…
| Starting Location | Ending Location | Transition(s) Name(s) | What drives this/these transition(s)? | | --- | --- | --- | --- | | Clouds | River | Precipitation, Collection | Gr…
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part 1: a water molecules journey. using the starting and ending locati…
| Starting Location | Ending Location | Transition(s) Name(s) | What drives this/these transition(s)? | | ---- | ---- | ---- | ---- | | Clouds | River | Precipitation, Collection …
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how many oxygen atoms (o) are in a carbon dioxide molecule? hint: in th…
2
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in its pure form, what state of matter is oxygen? liquid solid gas
Gas
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how many oxygen atoms (o) are in a water molecule? hint: in the model, …
1
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fictitious symbols are used for the first 18 elements in the periodic t…
The full placement of symbols on the periodic table requires a visual representation. But based on the above - described steps, each symbol can be placed in its appropriate positi…
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how many carbon atoms are in a carbon monoxide molecule? hint: in the m…
1
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how many total atoms are in a carbon dioxide molecule? hint: the sphere…
3
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nearly all living cells can use the sugar glucose as an energy source. …
D. potential energy in a molecule's bonds
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electron configuration practice worksheet in the space below, write the…
1. Sodium: $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. Iron: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}$ 3. Bromine: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}$ 4. Barium: $1s^{2}2s^{2…
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atoms of different elements contain different numbers of protons and el…
For a general atom with mass number $A$ and atomic number $Z$: - Number of protons = $Z$ - Number of neutrons = $A - Z$ - Number of electrons = $Z$
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atoms of different elements contain different numbers of protons and el…
For a given nuclear notation $_{Z}^{A}X$, Atomic number = $Z$, Mass number = $A$, Number of protons = $Z$, Number of electrons = $Z$ (neutral atom), Number of neutrons = $A - Z$.
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agriculture has no impact on the levels of organic content in soil beca…
F
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question 20 1 pts every business, including your practice, must follow …
be informed of all chemicals you may be exposed to while doing your job.
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station summarize read the provided science article down below. summari…
The electromagnetic spectrum encompasses different forms of light energy. Wavelength and frequency are key concepts. The spectrum has seven wave types. Radio waves have long wavel…
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differentiate between a monomer and polymer. a monomer is smaller and a…
monomer; macromolecule
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4. an atom of an element \a\ have equal percentage of isotopes, a - 50 …
51 amu
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3. from the picture below, what are true options (select two) for the i…
- The isotopes have same "Z" but different "A" - The isotopes have same number of Protons and different number of neutrons.
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2. chlorine - 35 is an isotope of chlorine that has 17 protons and 18 n…
$_{17}^{35}Cl$