Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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when the following equation is balanced using the smallest possible int…
(First Question): 4 (the option with 4, e.g., if options are numbered as 1:1, 2:2, 3:3, 4:4, 5:6, then 4. Option D: 4)
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when the following equation is balanced using the smallest possible int…
(Question 1): 1 (the coefficient of \( \mathbf{H_2} \) is 1)
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4 the end result of this certification process is food on supermarket s…
By showing how organic labels are more specific than advertising buzzwords (the last option in the choices, corresponding to "By showing how organic labels are more specific than …
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a is generally a poor conductor of heat and electricity and has a wide …
a. Nonmetal
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why does the author discuss large agricultural businesses? to suggest r…
C. To develop the idea that small family farms are not the primary producers of organic foods. (Note: Assuming the third option is labeled C; adjust identifier based on actual lab…
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unit 4 molecular geometry practice test three rules of bonding: it is..…
$\ce{CaCl_{2}}$ is an ionic compound.
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for many people, the word \organic\ evokes the image of mother nature a…
Since no specific question is provided about this text, it's not possible to determine the appropriate subfield or solution. If you have a question related to this text, such as a…
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which sentence from the text provides the strongest evidence that organ…
B. "A farm certified as organic has to emphasize the use of renewable resources and focus on conserving soil and water quality."
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what is the only metal that is not a solid at room temperature? a iridi…
b. mercury
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question 8. state the number of electrons either lost or gained in form…
a. Lost, 3 b. Gained, 1 c. Gained, 2 d. Lost, 1 e. Lost, 2 f. Gained, 3
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mercury is the only metal which is liquid at room temperature. a true b…
a. TRUE
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4. death stands above me, whispering low i know not what into my ear be…
Personification ### Question 5 (Type of Rhyme)
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write the balanced equation. write the ionic equation and net ionic equ…
$\ce{Bi(NO_{3})_{3}(aq) + 3NaOH(aq) -> Bi(OH)_{3}(s) + 3NaNO_{3}(aq)}$
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using the following below, you must make 20 compounds using one from co…
20 Ternary Ionic Compounds: 1. $K_2SO_4$ (Potassium Sulfate) 2. $Na_2CO_3$ (Sodium Carbonate) 3. $Fe(OH)_3$ (Iron (III) Hydroxide) 4. $Be(NO_3)_2$ (Beryllium Nitrate) 5. $FrClO_3$…
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a neutral atom has equal numbers of and electrons.
protons
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what is the only metal that is liquid at room temperature on earth? ent…
Mercury (or Hg)
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an element is located in group 11 on the periodic table. would this ele…
metal
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find the balanced coefficients of the following chemical reaction: aque…
2, 1, 2, 1
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identify the reactant(s) in the reaction: hypochlorous acid + hydrochlo…
D. hypochlorous acid and hydrochloric acid
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identify the type of chemical reaction given here: c₂h₄(g) + 3o₂(g) → 2…
C. complete combustion
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which of the following explanations outlines an incomplete combustion r…
A hydrocarbon reacts with oxygen to form solid carbon, carbon monoxide, and water vapour.
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what is the skeleton equation for the synthesis of aluminum oxide? a. $…
d. $\ce{Al + O_{2} -> Al_{2}O_{3}}$
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the mole - practice ques 1. using the periodic table, calculate the mol…
To solve these problems, we'll use the concepts of molar mass, moles, and mass calculations. Molar mass is the sum of the atomic masses of all atoms in a compound. The formula rel…
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question 7. what is the formula of the ions formed when atoms of the fo…
a. $\ce{F^-}$; b. $\ce{N^{3 - }}$; c. $\ce{O^{2 - }}$; d. $\ce{Na^+}$; e. $\ce{Ca^{2 + }}$; f. $\ce{Al^{3 + }}$
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which of the following molecules is known for having a triple bond? car…
C. nitrogen
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question 7. what is the formula of the ions formed when atoms of the fo…
a. $\boldsymbol{\ce{F^-}}$ b. $\boldsymbol{\ce{N^{3-}}}$ c. $\boldsymbol{\ce{O^{2-}}}$ d. $\boldsymbol{\ce{Na^+}}$ e. $\boldsymbol{\ce{Ca^{2+}}}$ f. $\boldsymbol{\ce{Al^{3+}}}$
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question 6. how many electrons must be gained by each of the following …
a. Chlorine (Cl): 1 b. Nitrogen (N): 3 c. Oxygen (O): 2 d. Iodine (I): 1 e. Sulfur (S): 2 f. Phosphorus (P): 3
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the correct formula for nitrous acid is * a. hno₃(aq) b. hno₂(aq) c. nh…
b. $\ce{HNO_2(aq)}$
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question 5. how many electrons must an atom of each element lose to att…
a. Potassium (K): 1 b. Aluminum (Al): 3 c. Strontium (Sr): 2 d. Cesium (Cs): 1 e. Barium (Ba): 2
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damayia has been seeing a lot of social media ads about an exciting new…
D. Confirmation bias
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the picture shows the formation of an ionic compound. what is the name …
D. ammonium chloride
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why does carbon, a nonmetal, tend to form covalent bonds rather than io…
It requires gaining or losing four electrons, which is energetically unfavorable for ion formation.
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in the formation of an ionic compound, what is the role of the metal at…
It transfers electrons away to form a positive ion (cation).
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question 4. drag the appropriate terms or numbers into the correct spac…
The table is filled as shown above with the respective number of electrons, electron configurations, and noble gas configurations for each ion.
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question 3. complete the statements by identifying the noble gas config…
s (for each sub - question): 1. The electron configuration of \( \text{Li}^+ \) matches the noble gas \(\boldsymbol{\text{Helium (He)}}\). 2. The electron configuration of \( \tex…
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what type of energy is required to maintain carbon dioxide levels in th…
mechanical
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question 2. complete the following statements by filling in the blanks …
s: 1. octet 2. positive; loses 3. negative; gains 4. xenon (Xe) 5. gaining; 1
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question 1. match each term with its correct definition or description …
- Valence Electron → The electrons found in the highest occupied energy level of an element’s atoms. - Octet Rule → A principle stating atoms are stable when they have eight (8) v…
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true/false. the tendency for elements to achieve a stable electron conf…
True
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score: 454/600 sunlight contains ______ energy. ○ mechanical ○ potentia…
None of the given options (mechanical, potential, kinetic, chemical) are correct. Sunlight contains electromagnetic energy (specifically radiant energy, a form of electromagnetic …
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the chemical reactivity of nonmetals generally increases as you move: f…
From left to right across a period, then down a group
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how many protons? the atoms of any particular element always contain th…
Hydrogen: 1; Carbon: 6; Magnesium: 12; Atomic number
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an atomic mass unit (amu) is defined as the * mass of a carbon atom one…
B. one - twelfth the mass of a carbon atom
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which of the following bonds would be the most polar based on the given…
O-H ### Second Question (Lewis Diagram for NaCl)
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practice: predicting bonds fill in the reference box below to help you …
For K and Br, the type of bond predicted is Polar Covalent.
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read the passage. there are several questions about this passage. power…
2. widespread presence ### Part B
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a chemist makes a graph showing the electronegativity of some of the el…
C. 3.5
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1. directions: the suggested time for answering this question is about …
- Chemical Soil Test: **Soil pH Test** – Measures soil acidity/alkalinity. If pH is too low (acidic), lime is recommended to improve nutrient availability (e.g., phosphorus) for c…
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what electron configuration matches an oxygen ion (o²⁻)? 1s²2s²2p⁴ 1s²2…
The option with electron configuration $1s^2 2s^2 2p^6$ (the fourth option in the display).
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what quantities vary between isotopes of an element? neutrons and elect…
neutrons and atomic mass
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from return of the native the scene was strangely homogeneous, in that …
4. No, because the figure remains inseparable from the structure as a whole until she moves, implying that the word means "motionlessness."
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warm up: its all about the atom fill in the following chart for your el…
| Symbol | Br | | --- | --- | | Atomic Number | 35 | | Atomic Mass | ~79.90 (or 80) | | Mass Number | 80 (for common isotope) | | # of Protons | 35 | | # of Electrons | 35 | | # o…
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using figure 1 and figure 4, predict the most likely events that will r…
1. The chemical composition of the sun's core will begin to change. 2. The sun will continue to produce heavier elements. 3. The circumference of the sun will change.
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63\\atop{29}}cu # of protons? # of electrons? atomic number atomic mass…
- # of protons: 29 - # of electrons: 29 - Atomic Number: 29 - Atomic Mass: 63 - # of neutrons: 34
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3 multiple choice 1 point the total of the number of protons plus the a…
A. atomic mass
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2 fill in the blank 2 points ions differ by the number of choose your a…
First blank: electrons Second blank: neutrons
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ions & isotopes assignment (hw) 1 fill in the blank 1 point if you chan…
element
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1. the unbalanced chemical equation below represents the formation of a…
3:2 (So the correct option is the one with 3:2, i.e., the option labeled "3:2")
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question 14 of 14 which substances have an alkaline ph? select the two …
drain cleaner, baking soda
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question 13 of 14 what is the relationship between acids, bases, and hy…
Acids contain relatively few hydroxide ions, whereas bases contain excess hydroxide ions.
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which part of an atom forms covalent bonds with other atoms? ○ electron…
electrons in the outermost energy shell
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what characteristics make a particular molecule organic? select the two…
presence of carbon, a carbon-hydrogen bond
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silver has an atomic mass of 107. how many neutrons can be found in the…
60
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a scientist has isolated an organic molecule from a new alien life form…
A. A carbon atom in this molecule will share electrons with one or more carbon atoms also contained within this molecule.
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carbon has 6 electrons and 6 protons. using this information and the pe…
17
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using the illustration below, which substance has the highest concentra…
soda
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the number of protons an element has is its _____, whereas the number o…
atomic number; the type of bond it can form
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hummingbird food consists of sugar and water. when making hummingbird f…
A. solute; solvent
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using the periodic table in the diagram below, how many protons can be …
79
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water is considered a polar molecule. true false
true
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how many known elements exist? 115 118 110 100
B. 118
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as an acidic compound dissolves in water, the ph of the water ○ becomes…
B. decreases.
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which substance has a higher concentration of hydrogen ions than orange…
battery acid
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which substance has a higher concentration of hydrogen ions than coffee…
orange juice
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which substance has a lower concentration of hydrogen ions than ammonia…
liquid drain cleaner
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question 36 of 41 the \stickiness\ of water results from the _________ …
B. hydrogen
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which substance is most likely to dissolve in olive oil? ○ both nonpola…
a nonpolar molecule
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which statements accurately describe the polarity and electronegativity…
The atoms of the water molecule are held together by covalent bonds., The oxygen atom in a water molecule is strongly electronegative., A water molecule is polar, but it has no ne…
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question 33 of 41 identify the solute and solvent of each solution. sol…
sugar water: sugar (solute), water (solvent) oil-based paint thinned with paint thinner: mineral spirits (solvent), paint (solute) cup of instant sports drink: drink powder (solut…
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question 30 of 41 if the solid form of most molecules is heavier than t…
The crystalline structure of ice is less dense than liquid water. Ice provides arctic and antarctic animals with a land habitat. Aquatic animals can survive when the surface of wa…
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what property of water molecules leads to the high surface tension of l…
formation of hydrogen bonds between water molecules
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question 24 of 41 which statement about organic compounds is true? a co…
An organic compound typically has at least one carbon–hydrogen or carbon–carbon bond.
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mid year practice 23. matter and energy can neither be created nor dest…
Energy and matter move to the consumer ### Question 24
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18. scientists, such as biologists and physicists, study different topi…
All scientists ask questions and use evidence to answer them. ### Question 19
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glucose (a monosaccharide) has the molecular formula c₆h₁₂o₆. how many …
6
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the bond between the oxygen atom and a hydrogen atom in a water molecul…
E. covalent
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in terms of bond strength, which of the following is the weakest? ○ cov…
D. hydrogen
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question 16 of 41 what is a polymer? ○ a small subunit that can react w…
a large molecule composed of many repeated subunits
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what is a monomer? ○ a small molecule that can react with similar molec…
a small molecule that can react with similar molecules to form a polymer
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when an atom loses an electron, what happens? ○ atoms cannot lose elect…
C. It becomes positively charged.
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question 9 of 41 consider the image of carbon. how many electrons are i…
D. 2,4
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what effect do valence electrons have on the reactivity of elements? th…
The way elements react with each other is determined by the number of electrons in their outermost shells.
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question 7 of 41 why are noble gases, such as argon, chemically inert? …
Noble gases have a full outer electron shell.
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question 6 of 41 how many protons, neutrons, and electrons does a neutr…
8, 8, 8
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which of the choices is the unique, defining property of atoms of a par…
the number of protons
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question 3 of 41 which of the properties is the unique, defining proper…
atomic number
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11.) how many grams is 924 kilograms? 924 kilograms = ______ grams
\( 924000 \)
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9.) how many milligrams is 8.4 grams? 8.4 grams = ______ milligrams
\( 8400 \)
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how does the structure of passage 2 help the speaker approach love and …
It lacks any rhyme scheme, making the poem sound erratic, which mirrors the speaker’s state of mind.
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how does the structure of passage 2 help the speaker approach love and …
The option with the red dot: "It lacks any rhyme scheme, making the poem sound erratic, which mirrors the speaker’s state of mind."