Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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select the statement(s) that are true about carbon. carbon dioxide abso…
Carbon atoms are essential to all life on Earth. The ocean stores more carbon than the atmosphere.
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what is the hybridization of the central atom in the nitrogen trifluori…
sp³
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question 10 (1 point) excerpt from a chemistry article: \chemical react…
D. The law of conservation of mass suggests that no mass is lost or gained in a reaction.
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what is the hybridization of the central atom in the orthosilicate (sio…
$sp^{3}$
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what is the hybridization of the central atom in the boron trifluoride …
sp²
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what is the hybridization of the central atom in the beryllium hydride …
$sp$
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what is the hybridization of the central atom in the phosphorus pentach…
$sp^3d$
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what is the hybridization of the central atom in the hydrogen - sulfide…
$sp^3$
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answer the questions below about the highlighted atom in this lewis str…
In how many sigma bonds does the highlighted atom participate? 4 In how many pi bonds does the highlighted atom participate? 0 What is the orbital hybridization of the highlighted…
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which of the highlighted chemical bonds in the molecules below is longe…
| compound | length of highlighted bond | energy of highlighted bond | |--|--|--| | $H - P - H$ | In between | In between | | $H - As - H$ | Longest | Lowest | | $H - N - H$ | Sho…
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question 10 (1 point) what happens when there is not enough activation …
C. The chemical reaction does not proceed
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this chemical formula is called an element atom compound substance
C. compound
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match the following phase changes: gas → solid, solid → gas, liquid → s…
gas → solid - Deposition solid → gas - Sublimation liquid → solid - Freezing liquid → gas - Vaporization gas → liquid - Condensation
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which of these is an element? oxygen (o) salt (nacl) carbon dioxide (co…
Oxygen (O)
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h₂so₄ sulfuric acid is a atom based compound corrosive element
B. compound, C. corrosive
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30/33 the number at the top of each square on the periodic chemical sym…
atomic number
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how many atoms of oxygen are in this chemical formula? one two four thr…
B. two
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magnesium has a chemical symbol of (mg) is listed as a compound element…
B. element
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how many total elements are in the chemical formula of chn₃au?
A. 4
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in the modern periodic table elements are arranged by: atomic number nu…
A. atomic number
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a__________ has a least two or more capital letters. solution compound …
B. compound
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this substance cannot be separated physically or chemically. atom eleme…
atom
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which element is in the same group as chlorine (cl) and lithium (li) li…
C. bromine (Br)
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which answer choice is an element?
C. X
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what is the difference between an element and a compound? an element is…
An element is a pure substance made up of only one type of atom, while a compound is a substance made up of two or more different types of atoms chemically bonded together.
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which of the following answer choices would not be listed on the period…
A. Salt (NaCl)
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pure substances are divided into two categories 1. elements and compoun…
elements and compounds
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an element’s identity is determined by the number of valence. electrons…
D. protons
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which of the following answer choices is a compound sb n si3 h2so4
D. H₂SO₄
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16/33 the atomic number tells you what? number of neutrons number of el…
C. number of protons
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14/33 helium(he) + helium(he) would be considered an compound with 1 at…
C. element with 2 atoms of Helium
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true or false: elements and compounds are pure substances.
True
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pure substance that is the more pure is atom elements compounds mixtures
atom
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an element has __________ number of atoms. two or more one four three o…
B. one
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the table listed above is named solutions table metals found in the ear…
C. periodic table of elements
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an element cannot be separated. with an atom, socially, chemically, phy…
D. physically
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an element cannot be separated with an atom socially chemically physica…
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name______ period______ date______ directions: solve each problem. circ…
1. Atomic number: 45, Mass number: 103, Symbol: $Rh$ 2. $^{39}_{19}K$ 3. $^{80}_{35}Br$ 4. $^{42}_{20}Ca$ 5. $^{238}_{92}U$ 6. 24.45 amu 7. Boron - 11 is more abundant. Justificat…
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a vertical column is called... period group tower crew
B. group
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which of the following answer choices is not a compound? nacl si pbso h…
Si
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the colors on this picture gives a clue this image is element mixture c…
D. molecule
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the horizontal row on the periodic table is called a family atomic numb…
C. period
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elements in a ...............have similar chemical properties. period r…
C. group
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a substance with 1 capital letter or 1 capital letter and a lower case …
C. element
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which of the following can be separated chemically? elements and mixtur…
B. compounds only
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a moving bus transfers chemical potential energy into electrical energy…
D. kinetic energy
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which of these is a compound? carbon dioxide (co2) nitrogen (n) sand al…
Carbon Dioxide (CO2)
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a boy pushes on a parked car with a force of 200 n. the car does not mo…
1. **Question 1: At what point on a roller - coaster is the gravitational potential energy (GPE) the LOWEST?** - # Explanation: - ## Step1: Recall the formula for gravitational po…
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what is the correct way to balance a chemical equation? * balance the e…
A. Balance the equation by changing the coefficients so that the number of atoms of each element is equal on both sides.
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how do the chemical properties of elements affect chemical reactions? *…
The chemical properties of elements determine which substances can react together and what products will form.
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what happens to atoms during a chemical reaction according to the law o…
Atoms are rearranged during a chemical reaction, but the total number of each type of atom remains the same.
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consider the equation: h2 + o2 → h2o. why is this equation not balanced…
The equation is not balanced because there are 2 oxygen atoms on the reactant side and only 1 on the product side.
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which chemical equation correctly represents the reaction between sodiu…
No options are correct as the correct equation is $2Na + Cl_2 ightarrow2NaCl$. If we assume there was a typo in the options and the first option was meant to be $2Na+Cl_2 ightarro…
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which chemical equation correctly represents the reaction between sodiu…
1. None of the given options for the first question is correct. The correct equation is $2Na + Cl_2 ightarrow2NaCl$. 2. D. The periodic table can be used to predict how elements w…
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how do the outermost electrons of atoms influence chemical reactions? *…
The outermost electrons determine how atoms bond and react with other atoms.
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what does the law of conservation of mass state about chemical reaction…
The law of conservation of mass states that atoms are neither created nor destroyed in a chemical reaction.
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consider the chemical equation: 2h2 + o2 → 2h2o. which statement about …
The equation is balanced because there are 2 hydrogen atoms and 2 oxygen atoms on both sides.
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organizing elements worksheet name:______ date:______ period:______ is …
1. True 2. True 3. Electrons 4. a. The atoms are arranged in order by increasing atomic number 5. Rubidium: alkali metal Cesium: alkali metal Bromine: halogen Iodine: halogen Stro…
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consider the chemical equation: 2h2 + o2 → 2h2o. which statement about …
The equation is balanced because there are 4 hydrogen atoms and 2 oxygen atoms on both sides.
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which statement best describes the purpose of a chemical equation? * a …
A chemical equation uses symbols and formulas to represent the reactants and products in a chemical reaction.
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which statement best describes the purpose of a chemical equation? * 1 …
1. C. A chemical equation uses symbols and formulas to represent the reactants and products in a chemical reaction. 2. The equation is balanced because there are 4 hydrogen atoms …
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why are atoms considered to be conserved during chemical reactions? * a…
Atoms are conserved during chemical reactions because the total number of each type of atom remains the same before and after the reaction.
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this three dimensional version of the periodic table shows ionization e…
Halogens have high ionization energies, making it difficult to remove a valence - electron and thus they do not form positive ions easily.
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in the chemical equation: 2al + 3o2 → 2al2o3, how many oxygen atoms are…
For the number of oxygen atoms on the reactant side: There are 6 oxygen atoms on the reactant side of the equation. For the number of hydrogen atoms in 4 molecules of methane: The…
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how many chlorine atoms are present in 2 units of magnesium chloride (m…
There are 4 chlorine atoms in 2 units of magnesium chloride (MgCl2).
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how many oxygen atoms are present in 2 molecules of carbon dioxide (co2…
1. There are 4 oxygen atoms in 2 molecules of carbon dioxide (CO2). 2. There are 24 hydrogen atoms in 2 molecules of glucose (C6H12O6).
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how many sodium atoms are present in 2 units of sodium sulfate (na2so4)…
There are 4 sodium atoms in 2 units of sodium sulfate (Na₂SO₄).
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how many hydrogen atoms are present in 3 molecules of ammonia (nh3)? * …
There are 9 hydrogen atoms in 3 molecules of ammonia ($NH_3$).
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what is the name of this compound? cs2o cesium oixide cesium oxide dice…
dicesium monoxide
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what is the name of this compound? nh3 nitrogen trihydride nitrogen hyd…
nitrogen hydride, nitrogen trihydride
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what is the name of this compound? h2o2 dihydrogen oxide water hydrogen…
Hydrogen peroxide
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what is the name of this compound? ca3p2 not a compound calcium phosphi…
calcium phosphide
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what is the name of this compound? co carbon monoxide carbon oxide mono…
carbon monoxide
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15. why are noble gases generally unreactive? a) they have high atomic …
C. Their outer electron shells are full
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what is the name of this compound? cs2o cesium monoxide cesium oxide no…
cesium oxide
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what is the name of this compound? nh3 nitrogen trihydride nitrogen hyd…
nitrogen hydride
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what is the name of this compound? li3n lithium mononitride trilithium …
lithium nitride
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12. which of the following groups contains elements that are most react…
12. A. Group 1 (Alkali Metals) 13. C. Protons are added to the nucleus without much shielding 14. D. Ba
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9. which of the following best explains why atomic radius decreases acr…
9. B. Number of protons increases, pulling electrons in 10. B. It decreases 11. C. He
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what is the name of this compound? h2o2 water dihydrogen dioxide dihydr…
hydrogen peroxide
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what is the name of this compound? n2o nitrogen oxide dinitrogen oxide …
nitrous oxide (or dinitrogen monoxide)
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what is the name of this compound? mgcl2 magnesium chloride not a compo…
magnesium chloride
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what is the name of this compound? ca3n2 calcium dinitride calcium nitr…
calcium nitride
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what is the name of this compound? nh3 nitrogen hydride not a compound …
nitrogen trihydride
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what is the name of this compound? nacl not a compound sodium chloride …
sodium chloride
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what is the name of this compound? co carbon oxide carbon monoxide mono…
carbon monoxide
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what is the name of this compound? bane2 monobarium neon barium neon ba…
not a compound
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6. electronegativity generally increases as you move: a) down a group a…
6. B. Up a group and right across a period 7. B. Fluorine 8. A. Increases
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3. which of the following elements has the highest ionization energy? a…
3. B. Fluorine (F) 4. B. The energy required to remove an electron from a neutral atom 5. B. Alkali metals
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1. which of the following elements has the smallest atomic radius? a) n…
1. C. Cl 2. B. Decreases
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what is the name of this compound? cs2o not a compound dicesium monoxid…
dicesium oxide
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what is the name of this compound? nacl monosodium chloride not a compo…
sodium chloride
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what is the name of this compound? ca2o3
The formula Ca2O3 is incorrect. The common calcium - oxygen compound is calcium oxide (CaO).
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match the act with its purpose. note: to complete this question without…
1. The Organic Act 2. The Natural Forest Management Act 3. The Forest and Rangeland Act 4. The Forest Reserve Act
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select the correct answer. if someone has had feelings of sadness, hope…
C. Depression
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what rule is violated here? 1s 2s 2p aufbau principle hunds rule pauli …
Hund's rule
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classifying matter review practice 1) identify each substance as either…
| Material (formula or ingredients listed) | Is it a pure substance or mixture? | For pure substances: Is it an element or a compound? | For mixtures: Is it homogeneous (solution)…
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which one is larger in size? po se s o
Po
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what rule or principle is violated here? 1s 2s 2p aufbau principle paul…
C. Hund's Rule
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shade metals blue and the non - metals red. 5. how many valence electro…
5. b. Metals have less than 4 valence electrons. 6. d. Non - metals have 4 or more than 4 valence electrons. 7. Their valence shell is full (helium has 2 valence electrons, neon a…