Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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what should go into the empty box in this equation? * 293 116 lv→□+289 …
An alpha particle
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what causes an atom to have a positive charge? it loses a proton. it ga…
It loses an electron.
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which represents the ion formed when aluminum achieves a full valence s…
C. \(Al^{3+}\)
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which of the following formulas is correct? a d b c
A. \(Mg^{2+}\)
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why does carbon tend to not gain or lose electrons? because it has four…
Because it has four valence electrons, so it would need to gain or lose four electrons to have a full valence shell.
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how many electrons will bromine gain or lose when it becomes an ion? lo…
Gains 1
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there are 3 known isotopes of a mystery element a. what are acceptable …
\(10\%,10\%,80\%\) ### Second Question:
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what will be calciums charge when it becomes an ion? 6- 2+ 6+ 2-
B. \(2+\)
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why do atoms form ions? to balance the positive protons and negative el…
To achieve 8 valence electrons
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how many neutrons are in the most common isotope of chlorine: chlorine-…
18 neutrons ### Second Question
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the average atomic mass of nitrogen is... * 14.0067 amu 15.999 amu 1.00…
14.0067 AMU
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what causes an atom to have a negative charge? it gains an electron. it…
It gains an electron.
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how many electrons will calcium gain or lose when it becomes an ion? ga…
B. Loses 2
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what will be bromines charge when it becomes an ion? 1+ 1- 7- 7+
1 -
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southern and eastern asia today breathing polluted air pollution increa…
Pollution, New Delhi, Fossil fuels, Beijing
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8. an aluminum can has a mass of 229 grams. if you want to know how man…
\(1\space mole = 6.022\times10^{23}\space atoms\), \(1\space mole\space of\space aluminum = 26.98\space g\)
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7. how many particles are in 1.6 moles of magnesium bromide (mgbr₂)? 10…
9.63 x 10²³ particles
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4. a balloon contains 3.7 moles of helium gas. how would you convert th…
Multiply 3.7 moles times a conversion factor of 22.4 Liters / mole.
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3. how many moles of alcl₃ are there in 400.5 grams of alcl₃? 0.34 mole…
3.00 moles
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1. halloween is just around the corner! the chemical formula for sugar,…
\(6.02\times 10^{23}\)
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2 what is the formula for barium nitride? ban₂ ban ba₃n₂ ba₂n₃ clear all
\(Ba_3N_2\) (the option \(Ba_3N_2\) is correct)
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what is the name of the binary compound for the formula nh₄oh? enter th…
Ammonium hydroxide
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which component is affected when a catalyst is added to a chemical reac…
the activation energy
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the bond angle for a trigonal planar molecule is
120 Degrees
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read the following information from a material safety data sheet (msds)…
Remove the shirt, and rinse the skin with water.
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both carbon dioxide and water have atoms bonded to the central atom. ca…
1. two 2. non - polar 3. polar 4. lone pairs
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the structure shown here is of bcl₃. in this molecule, boron and chlo a…
trigonal planar
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what is the vsepr theory used to predict, and how does its application …
Molecular Shape
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a student wants to create a liquid volcano. the student observes bubble…
The candy tablets being added to the drink.
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which statement best describes the amount of catalyst that remains at t…
The amount of catalyst is the same at the end as at the beginning of the reaction.
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a substance that influences the reaction but does not participate in th…
catalyst
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10. a soap micelle can form when molecules are dissolved in water becau…
polar regions of the soap molecule experience electrical attraction to the polar water molecules.
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97. a molecule with the formula ab₂, in which a and b represent differe…
- **Linear shape**: - Sketch: \(B - A - B\) (straight line). - Name: Linear. - Example: \(BeCl_{2}\) (in the gas phase). The central \(Be\) atom has \(2\) bonding pairs and \(0\) …
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9. based on figure 1, soap molecules interact differently with water th…
some regions of the molecule are polar, while others are non - polar.
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8. the ways in which different types of matter interact with each other…
the electrical forces within and between atoms.
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7. soap molecules form micelles around oil molecules due to forces. the…
First blank: electric; Second blank: attracted to
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5. the characteristics or properties of a substance are mainly determin…
the types of atoms found within the substance and how they are bonded or arranged.
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3. which best explains how neverwet works against stains? neverwets sur…
Neverwet's surface is nonpolar which means that polar substances, such as water, are less soluble and repelled.
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5 multiple choice 14.3 points which of the following practices can help…
5. grow a vegetable garden 6. chicken 7. use the animal dung as a natural fertilizer
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your friend suggests that measuring contact angle is an accurate way to…
No, because contact angle is not related to polarity of a substance so it will not bead up at an angle.
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1. nonpolar molecules do not produce an electric field, which is what u…
Without an electric field, the polar water molecules form water droplets which cling to themselves and not to the nonpolar NeverWet surface.
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what is the h - c - h angle in methane, ch₄? * 180° 120° 109.5° 90°
\(109.5^{\circ}\) (the third option in the given multiple - choice list)
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which substance has three covalent bonds? * h₂o ch₂cl₂ ccl₄ nh₃
NH₃
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according to vsepr theory, the structure of the ammonia molecule, nh₃, …
trigonal pyramidal
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in which state of matter are the molecules spaced farthest apart? solid…
B. Gas
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use vsepr theory to predict the shape of the hydrogen sulfide molecule,…
angular
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4. make a rule: based on your data, how are elements arranged into chem…
- **Question 4**: Elements are arranged into chemical families based on similar chemical properties (due to the same number of valence electrons). - **Question 5**: Boron family: …
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2. gather data: four other pairs of elements in the same chemical famil…
| Element Pair | Valence Electrons | |---------------------|-------------------| | Beryllium - Magnesium | 2 | | Nitrogen - Phosphorus | 5 | | Oxygen - Sulfur | 6 | | Fluorine - C…
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b. turn on show formula. what is the formula of this compound? li2o c. …
- **A. Lithium and fluorine**: - Ionic charges: \(Li^{+}\), \(F^{-}\) - Chemical formula: \(LiF\) - **B. Beryllium and oxygen**: - Ionic charges: \(Be^{2+}\), \(O^{2 -}\) - Chemic…
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mass and volume are both extensive properties; they change with the amo…
1. Extensive 2. Intensive 3. Intensive 4. Extensive
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c. can a stable compound be made from these two atoms? explain why or w…
A. Yes. B. \(Li_{2}O\). C. \(Li^{+}\), \(Li^{+}\), \(O^{2 -}\).
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which of the following statements correctly describes rocks and mineral…
Rocks are composed of minerals.
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question: how are ionic compounds formed? 1. observe: look at the purpl…
A. 1 B. 2
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4. think and discuss: why is there an attraction between the two ions i…
There is an attraction between the two ions in the chemical bond because one ion is positively charged (cation) and the other is negatively charged (anion), and opposite charges a…
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3. form a bond: each electron has a charge of 1-, and each proton has a…
A. Sodium: \(1+\), Chlorine: \(1-\) B. Yes. Sodium ion (\(Na^{+}\)) has a full outer shell (2 - 8 configuration). Chloride ion (\(Cl^{-}\)) has a full outer shell (2 - 8 - 8 confi…
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2. observe: most atoms are stable with a configuration of eight valence…
Sodium has \(1\) valence electron. Chlorine has \(7\) valence electrons. After electron transfer, Sodium has a charge of \(+1\) and Chlorine has a charge of \(-1\).
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1. count: electrons move around the nucleus of atoms in specific shells…
A. Sodium: \(11\), Chlorine: \(17\) B. Sodium: \(11\), Chlorine: \(17\)
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gizmo warm - up just like students sharing markers, atoms sometimes sha…
A. Sodium (\(Na\)) is a metal. Chlorine (\(Cl\)) is a non - metal. B. Sodium becomes \(Na^{+}\), chlorine becomes \(Cl^{-}\), and an ionic bond is formed between them.
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gizmo warm - up just like students sharing markers, atoms sometimes sha…
Sodium: 1, Chlorine: 7
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which of the following is not among the many benefits of insect farming…
All of the answers here are benefits.
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problem #5: ___mgf₂ + ___li₂co₃ → ___mgco₃ + ___lif step 1: count mg= f…
\(1MgF_2+1Li_2CO_3 ightarrow1MgCO_3 + 2LiF\)
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student exploration: ionic bonds directions: follow the instructions to…
Nate can give 1 marker to Clara.
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1. label the parts of the atom by dragging and dropping the correct ter…
1. nucleus 2. proton 3. electron 4. neutron
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37. in the lewis structures listed here, m and x represent various elem…
(a) \(MgS\) (b) \(AlCl_{3}\) (c) \(Na_{2}S\) (d) \(Al_{2}S_{3}\)
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multiple - choice question water vapor turning back into a liquid is ca…
condensation
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matter is 1 anything that you can see 2 anything that takes up space an…
2. anything that takes up space and has mass
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oliver and heaou are enjoying a picnic on a hot summer day. they have b…
Melting
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on a hot summer day, angelina and gael are having a picnic. angelina no…
Condensation: molecules change from widely spaced (gas) to closely packed (liquid).
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in a science fair, isaac, lesha, and mykol are presenting their project…
Milk and air.
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sublimation evaporation condensation freezing melting a change from liq…
Evaporation
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during a winter science project, emiliany and lesha noticed that the mo…
Solid
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you move a substance from a small container to a larger container. whic…
Gas and Plasma.
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mhiel, kylie, hailey, oliver, and ashton are at the beach on a hot day.…
Evaporation has occurred; molecules are more spread out in the gas phase.
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oliver and hassan are enjoying a picnic on a hot summer day. they have …
Melting
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what is the mass number of the isotope lithium - 7? lithium has 3 proto…
7 5
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denise, sam, and jack were making a fruit punch. nick poured orange jui…
Liquid
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a___ has the same volume and shape that are always the same as the cont…
Solid
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as the movement of water molecules begin to slow down, they go into a p…
freeze
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sublimation condensation evaporation melting freezing a change from gas…
Condensation
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a change from solid to gas (without ever being a liquid) is called?
Sublimation
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abigail, leiah, and kayla are working on a chemistry project for their …
Table salt they purchased from the local grocery store.
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during a science experiment, lesha and lsooc observed the process of co…
The water vapor condensed into droplets on the glass.
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on a hot summer day, angelina and gael are having a picnic. angelina no…
Condensation; molecules change from widely spaced (gas) to closely packed (liquid)
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mhiel, janette, and gael are making popsicles at home on a hot summer d…
Solid state (ice)
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sulfar has a melting point of 215 oc. this means that if sulfars has a …
Only Liquid
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during a cooking class, hailey and ashton noticed that the molecules of…
Liquid
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angelina has left her ice cream out in the sun and is observing it turn…
Melting; molecules move from a fixed position to a more fluid state.
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during a science experiment, lesha and isaac observed the process of co…
The water vapor condensed into droplets on the glass.
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kylie and angelina were enjoying a hot cup of coffee on a chilly day. t…
condensation
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sulfar has a melting point of 215 oc. this means that if sulfar has a t…
Both Solid and Liquid
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a change from a solid to a liquid is called?
Melting
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a____ has the same shape and volume in any container.
Solid
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one mole of diatomic molecule a₂ reacts with one mole of diatomic molec…
\(-333\)
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sulfar has a melting point of 215 oc. this means that if sulfars has a …
Only Solid
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a___ has the same volume in any container, but takes the shape of the c…
Liquid
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the condenstaion point for h2o is --- (remeber to use the scientific te…
\(100^{\circ}C\)
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is a compound considered a pure substance? why or why not?
Yes, a compound is considered a pure substance. Because it has a definite composition with a fixed ratio of elements chemically bonded together.
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multiple - choice question to decompose means - synthesis or to make de…
decay or dissolve
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select the molecule that contains the most polar bond. note that you sh…
\(H_2O\)
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the element aluminum has an atomic number of 13. how many protons are i…
13 13