化学
化学反応、化学量論、分子構造、元素の性質。
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is the compound soluble or insoluble in water? al₂(so₃)₃ aluminum sulfi…
insoluble (s)
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q2 chemistry: u3l2 effective nuclear charge prepwork part 2: atomic rad…
1. C. Increased \(Z_{eff}\) 2. B. More shielding and energy levels 3. C. \(F\) 4. D. \(Ba\) 5. False 6. True 7. True 8. True 9. True
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which best describes ionic compound formulas? they have more positive c…
They have an equal number of positive and negative charges.
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which is a valid ionic compound? sodide chlorine sodium chlorine sodium…
sodium chloride
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the charges for four ions are sodium (na) +1, calcium (ca) +2, fluorine…
\(Na_2S\)
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zinc has a charge of +2, and oxygen has a charge of -2. which is the ch…
A. $ZnO$
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which is a representation of a compound that gives the number of atoms …
chemical formula
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a list of different ions is shown. which combination of ions will resul…
B. \(NaF\)
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magnesium has a charge of +2, and chlorine has a charge of -1. to form …
1
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an ionic bond for calcium and oxygen is cao. if an oxygen ion has a cha…
+2
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sarah is asked to sort out the list of ions and ionic compounds. how ca…
Ions have a positive or negative charge, but an ionic compound’s overall charge is zero.
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the chemical formula for lithium phosphide is li₃p. which best describe…
Lithium ions have 1 positive charge, and phosphorus ions have 3 negative charges.
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a monomer is a chain of molecules building block large chain of buildin…
building block
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1. start with the substance as a solid. ○ what do the particles look li…
1. - Particles in solid: Closely - packed, vibrating in fixed positions. - Effect of heating solid: Particles vibrate more vigorously. - Change of state in solid: At melting point…
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part a: observations 1. start with the substance as a solid. ○ what do …
1. - Particles in solid: Closely - packed, orderly. - When temp increased: Vibrate more. - Change of state: At melting point (solid → liquid). 2. - Liquid particles: Move past eac…
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which sentence contains a dependent clause? a. please use more than one…
B. Until we get to Brooklyn, we're not allowed to sleep.
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nitric acid is produced commercially by the ostwald process. the three …
\(5.4\times 10^{5}\space kg\)
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the chemical formula for an ionic compound made of potassium and chlori…
potassium chloride
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use the drop - down menus to order the steps for writing chemical names…
1. Identify the positive ion and write its name as is. 2. Identify the negative ion and write its name. Replace the ending with the suffix -ide. 3. Write the complete chemical nam…
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nitric acid is produced commercially by the ostwald process. the three …
\(5.4\times 10^{5}\space kg\)
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the ratio of na to o is 2:1. what is the chemical formula for this ioni…
Na₂O
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for every o ion, two na ions are needed to balance charges. which ratio…
\(2\ Na:1\ O\) (the third option)
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an na ion has a charge of +1 and an o ion has a charge of -2. how many …
\(2\)
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hydrogen and oxygen gases are mixed. the hydrogen gas exerts a pressure…
203 kPa
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a mixture of helium and nitrogen has a total pressure of 2.8 atm. the p…
0.039 mols
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chlorine and nitrogen gases are mixed in a 2.85 l container at 405 k. t…
0.074 mols
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hydrogen and oxygen gases are mixed in a 2.0 l container at 350 k. the …
0.017 mols
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nitrogen and oxygen gases are mixed in a 0.85 l container at 285 k. the…
0.020 mols
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18 g of helium gas and 25 g of neon gas are mixed in a 3.50 l container…
26 atm
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question 1 (1 point) true/false: valence electrons are the innermost el…
Question 1: B. False Question 2: A. True
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1. fill in the table below 2. which subatomic particle is positively ch…
\(92\)
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question 9 (2 points) (03.04 mc) what best describes the bonding in a s…
d. A silicon atom shares two electron pairs with each oxygen atom. # Question 10
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question 7 (2 points) (03.04 lc) which phrase best describes the bond i…
Question 7: A. Double covalent bond Question 8: D. Non - bonded valence electrons
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question 4 (2 points) (03.03 mc) what happens when the compound hcl is …
- **Question 4**: d. Hydrogen forms an ion with +1 charge, chlorine forms an ion with -1 charge. - **Question 5**: d. \(CaO\) because the total positive charge on \(Ca\) is two. -…
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determine which of the following electron configurations are not valid:…
16) Not valid 17) Not valid 18) Not valid 19) Valid 20) Not valid (assuming non - Xe element context)
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question 1 (2 points) (03.01 lc) lithium is located in the first group …
- Question 1: a. 1 - Question 2: a. A will give up electrons to form bonds - Question 3: c. Two negative charges
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determine what elements are denoted by the following electron configura…
11) Sulfur (\(S\)) 12) Yttrium (\(Y\)) 13) Antimony (\(Sb\)) 14) Osmium (\(Os\)) 15) Einsteinium (\(Es\))
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question 4 (4 points) (03.06 mc) what is the strongest intermolecular f…
d. Ion - dipole force ### Question 5
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question 1 (4 points) (03.06 lc) an induced dipole occurs when one mole…
A. True ### Question 2
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3. how did j.j. thomsons discovery of the electron change daltons atomi…
Thomson's discovery of the electron showed that atoms are not indivisible (as Dalton's theory proposed), but have smaller sub - atomic particles. ### Question 4
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which factor given is the most significant agent of erosion? pressure c…
ice
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in the space below, write the abbreviated electron configurations of th…
6) \([Ar]3d^{7}4s^{2}\) 7) \([Kr]4d^{10}5s^{1}\) 8) \([Kr]4d^{10}5s^{2}5p^{4}\) 9) \([Rn]7s^{2}\) 10) \([Rn]5f^{14}6d^{1}7s^{2}\)
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unit test: composition of the earth - part 1 what characteristic makes …
It has a definite chemical composition.
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one way a solar oven works is by transferring energy from the sun to...…
thermal energy in water or food / energía térmica en agua o alimentos
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heating an object to a higher temperature increases that objects... cal…
thermal energy
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bromine has two naturally occurring isotopes: br - 79 (abundance = 50.6…
The atomic mass of bromine is close to a value halfway between 78.92 u and 80.92 u. The calculated average atomic mass of Br is \(79.904\space u\)
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this table compares two atoms. use the information provided to determin…
a) 16, b) 16, c) 16, d) 20, e) 44, f) 20
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explain how the four isotopes of chromium, atomic number 24, differ fro…
The four isotopes of chromium (atomic number \(Z = 24\)) have the same number of protons (\(Z = 24\)) but different numbers of neutrons. The average atomic mass of chromium is app…
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write the chemical symbol for the isotope of cobalt with 37 neutrons. 2…
\(^{64}_{27}Co\)
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calculate the average atomic mass of silver using the isotopic composit…
\(106.65\)
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2. what physical properties do metals have because of electron delocali…
Metals have electrical conductivity (free - moving electrons carry current), thermal conductivity (electrons transfer heat), malleability (electron sea adjusts during deformation)…
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kissimmee river to its natural course. in addition, the state of florid…
Government wants to keep the Everglades' unique plant and animal life safe.
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question 4 suppose lashonda wants to find out about hydrogen sulfide. s…
C. in a guide to the most common gases
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8. order the following from lowest to highest electronegativity: o, na,…
\(Na < Li < C < O < F\) ### 9. Ordering by ionization energy
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compare and contrast mass number and atomic mass. 250 words remaining
Mass number is the sum of protons and neutrons in an isotope's nucleus (integer, isotope - specific). Atomic mass is the weighted - average mass of an element's isotopes (non - in…
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how many protons are in the atom designated by this symbol? a) 56 b) 30…
C. 26
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which is the correct symbol for the atom with 42 protons and 49 neutron…
A. \(_{42}^{91}Mo\)
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the modern periodic table is arranged from left to right in order of in…
atomic number
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manganese has a single natural isotope. use the information from the pe…
Atomic mass: \(54.938\) Number of protons: \(25\) Number of electrons: \(25\) Number of neutrons: \(30\)
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scandium has a single natural isotope. use the information from the per…
Atomic mass: \(44.956\) Number of protons: \(21\) Number of electrons: \(21\) Number of neutrons: \(24\)
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for a science fair project about food and chemistry, bill looks around …
He can demonstrate that water can be boiled on a simple kitchen stove.
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in carbon dioxide (co₂), there are two oxygen atoms for each carbon ato…
eight.
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an atom of tin has an atomic number of 50 and a mass of 119. how many p…
- Protons: \(50\), located in the nucleus. - Neutrons: \(69\), located in the nucleus. - Electrons: \(50\), located in the electron - cloud around the nucleus.
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why can a hydrogen atom form a covalent bond without fulfilling the oct…
Hydrogen’s valence shell can hold only up to two electrons.
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what is the mass number of an atom containing 12 protons and 13 neutron…
A. 25
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which element can join with other elements to form covalent bonds? bery…
carbon (C)
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after a covalent bond has stabilized an atom, the atom will have fewer …
a full valence electron shell.
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a candles wick is the fabric string that holds the flame, and it burns …
a low melting point
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the compound cyanogen (cn)₂ has covalent bonds shown in this diagram. h…
three
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which element has 14 protons? a) nitrogen b) aluminum c) silicon d) sul…
C. Silicon
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which diagram shows how the covalent bonds most likely form in a phosph…
The diagram with only single bonds (\(Cl - P - Cl\) with appropriate lone - pair dots) is the correct one. (Since the options are not labeled, but based on the bond - type analysi…
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the element carbon (c) is most likely to form covalent bonds with the e…
selenium (Se).
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what is the approximate mass of a proton? a) 0.98 u b) 1.01 u c) 1.10 u…
B. \(1.01\ u\)
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which chemical is processed less efficiently by cocaine addicts than by…
glucose
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text to speech reference sheet calculator >> the subatomic particles wi…
proton; neutron
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which scientists research led to the construction of the atomic model s…
D. Rutherford
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which scientist constructed the model of an atom in which the atom is m…
C. Thomson, yes
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which scientists research led to the construction of an atomic model in…
D. Rutherford
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democritus believed that matter is made up of tiny individual particles…
atoms
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identifying covalent compounds based on properties which compound is mo…
Compound A
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nylon is a \big\ covalent molecule used to make backpacks. which proper…
soft
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identifying the type of bond based on the number of electrons shared ho…
4
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showing electron sharing using electron dot diagrams which electron dot…
The second electron - dot diagram (the one with two dots between the two $\text{Cl}$ atoms and 3 lone pairs on each $\text{Cl}$ atom) is the correct one.
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determining the number of valence electrons chlorine, which is used to …
7
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identifying atoms that form covalent which of these atoms is most likel…
F (Fluorine)
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unit 1, lc2 practice when a chemical equation is balanced, this means t…
the same as
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balance the following chemical equations and show your work! ___sicl₄ +…
1. \(1SiCl_{4}+2H_{2}O = 1SiO_{2}+4HCl\) 2. \(2As + 6NaOH = 2Na_{3}AsO_{3}+3H_{2}\) 3. \(Zn + 2HCl = ZnCl_{2}+H_{2}\) 4. \(Au_{2}S_{3}+3H_{2}=2Au + 3H_{2}S\) 5. \(2N_{2}+5O_{2}+2H…
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unit 1, lc2 practice in a chemical reaction, the products have chemical…
different.
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unit 1, lc2 practice which of these is not evidence that a chemical rea…
solids dissolving in liquid
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unit 1, lc2 practice which of these is an example of a chemical change?…
bananas turning brown as they ripen
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sort each phrase by whether it is an individual, local, or national env…
- **Individual**: Turning off lights when not needed, Using back - porch bins for metal, paper, and plastic garbage. - **Local**: Implementing a ban on plastic grocery bags, Estab…
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sodium - 24 has a half - life of 15 hours. how many grams of a 900 g sa…
14.0625 g
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fill in the blanks to explain how different forms of energy are related…
During a fireworks display, chemical energy stored in the fireworks is converted to light energy (what we can see) and sound energy (what we can hear). The reactions in the firewo…
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carbon (c) is one of the most abundant elements on earth and is a criti…
Carbon has 6 protons, 6 electrons, and 6 neutrons.
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what determines whether and how much an atom will react with another at…
the number of outermost electrons
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what happens to the atoms and molecules as you add heat?
As heat is added, the atoms and molecules gain kinetic energy. Their motion (vibration in solids, translation in liquids and gases) becomes more vigorous. In solids, they vibrate …
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test content page 9 of 25 question 9 select the correctly punctuated se…
B. Taylor's favorite subjects are English and chemistry.
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56ni 28 1. elemental symbol: 2. atomic number: 3. number of protons: 4.…
1. \( \text{Ni} \) 2. \( 28 \) 3. \( 28 \) 4. \( 56 \) 5. \( 28 \)
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b. calculate the mass (in g) of cl₂(g) produced if 18.2 grams hcl(aq) o…
$8.875\ g$
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multiple choice 1 point what is the predicted noble gas configuration o…
\([Kr]4d^{8}5s^{1}\) (the second option)