Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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multiple choice question the term isotope describes two or more atoms w…
two or more atoms with the same atomic number but different mass numbers
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multiple choice question an element is defined as a pure substance that…
C. a pure substance that cannot be broken down into simpler substances by a chemical reaction
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match each subatomic particle with the correct description of its charg…
Proton - Charged particle residing in the nucleus Electron - Charged particle residing outside the nucleus Neutron - Uncharged particle residing in the nucleus
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fill in the blank question a compound is a pure substance made up of at…
elements
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6) what causes the different colors? include the part of the atom invol…
1. Similarities: Both involve light emission from excited atoms. Differences: Flame tests are for element identification in lab, fireworks are large - scale displays. 2. Different…
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match each elemental symbol with the correct element name. instructions…
- Cl: Chlorine - Co: Cobalt - Ca: Calcium - Cr: Chromium - Cu: Copper
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fill in the blank question an element is a pure substance that cannot b…
chemical
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q1 chemistry: u2l12 electron config day 2 prepwork part 1: follow the e…
| Element | # e- | Full e- configuration | Orbital diagram | | ---- | ---- | ---- | ---- | | Lithium | 3 e- | $1s^{2}2s^{1}$ | $\frac{1\downarrow}{1s}\frac{1}{2s}$ | | Aluminum | …
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name: q1 chemistry: u2l12 electron config day 2 teacher: date: uncommon…
| # | Element | # e- | Full e- configuration | Orbital diagram | | ---- | ---- | ---- | ---- | ---- | | 1 | Lithium | 3 e- | $1s^{2}2s^{1}$ | $\frac{1\downarrow}{1s}\frac{1\downar…
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which of these is a safe lab practice? picking up a hot beaker with you…
Labeling all chemicals immediately.
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what does this symbol indicate about a chemical? the chemical is flamma…
The chemical is an acutely toxic irritant.
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atoms and ions assignment i symbol # of protons # of electrons electric…
| Symbol | # of protons | # of electrons | electric charge | | ---- | ---- | ---- | ---- | | $Li^+$ | 3 | 2 | $1+$ | | $C$ | 6 | 6 | 0 | | $F^-$ | 9 | 10 | $1-$ | | $Mg^{2+}$ | 12…
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atoms and ions assignment i symbol # of protons # of electrons electric…
| Symbol | # of protons | # of electrons | electric charge | | ---- | ---- | ---- | ---- | | $K^+$ | 19 | 18 | $1+$ | | $He$ | 2 | 2 | 0 | | $O^{2 -}$ | 8 | 10 | $2 -$ | | $Cl^-$ …
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practice: other qualities of the table 1. name the three subatomic part…
1. Proton ($p^+$), neutron ($n^0$), electron ($e^-$) 2. First: 2, Second: 8, Third: 8 3. The number of protons in an atom's nucleus 4. The sum of protons and neutrons in an atom's…
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groundwater is a significant source of drinking water for many people. …
It may become contaminated with organic and inorganic chemicals that come from the soil above.
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drugs drugs are chemical substances that change the way the body works.…
1. A drug is a chemical substance that changes the way the body works. Drugs used as medicine help treat, prevent, or diagnose illness. 2. Drugs can enter the body in four ways: o…
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name drugs drugs are chemical substances that change the way the body w…
1. Drugs are chemical substances that change the way the body works, used as medicine to treat, prevent, or diagnose illness. There are prescription, over - the - counter, and ill…
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tobacco use tobacco use is the leading cause of death and disability th…
1. F; Tobacco use during adolescence is harmful as it reduces the rate of lung growth and can lead to long - term health problems. 2. F; It is extremely difficult to quit smoking …
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tobacco use tobacco use is the leading cause of death and disability th…
1. F; Tobacco use during adolescence is harmful as it reduces the rate of lung growth and can lead to long - term health problems even if the person quits before adulthood. 2. F; …
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dry ice is solid carbon dioxide that is used in the transport of food a…
sublimation
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which changes of state do the labels represent? a b c
A. Condensation B. Evaporation C. Freezing
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which changes of state do the labels represent? a b c
A. Sublimation B. Vaporization C. Melting
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to find out the standard, custom, and pantone color codes applied to a …
Click Font on the Home ribbon, from the drop - down menu click the "More Colors" option.
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multiple - choice question what is the name for this compound? nitrogen…
Trinitrogen Hexaoxide
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multiple - choice question true or false charges have to be balanced fo…
False
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methodology method: lab skill: off - gassing and stoichiometry procedur…
The mass percentage of \(NaHCO_3\) in the mixture (Pt. II) is approximately \(33.6\%\)
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purpose (lo): to determine the percent composition of sodium bicarbonat…
The balanced equations are: 1. $2NaHCO_3(s) ightarrow Na_2CO_3(s)+H_2O(g)+CO_2(g)$ 2. $2NaHCO_3(s) ightarrow Na_2O(s)+2CO_2(g)+H_2O(g)$ 3. $2NaHCO_3(s) ightarrow Na_2CO_3(s)+CO_2(…
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ionic and covalent nomenclature brittany kessler multiple - choice ques…
2+
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multiple - choice question what do you do to your polyatomic ions when …
put parenthesis around it
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atoms, elements, chemical bonds and enzymes 1. what is an atom made up …
1. Protons, neutrons, electrons 2. Protons: +, Electrons: -, Neutrons: neutral 3. In the nucleus 4. In electron - shells or orbitals around the nucleus 5. Number of neutrons = Ato…
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what is the formula for this compound? □ cu₆(no₃)₆ □ cu(no₃)₂ □ cu₂(no₃…
$Cu(NO_3)_2$
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multiple - choice question what is the name of mg(oh)2? magnesium (ii) …
C. magnesium hydroxide
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multiple - choice question what is the chemical formula of calcium phos…
A. $Ca_{3}(PO_{4})_{2}$
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which of these covalent bonds is polar, based on the electroneg? c - n …
C - N
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the bond formed by sharing valance electrons is hydrogen ionic covalent
C. Covalent
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question 6 in this molecule, what does the zig - zag line represent? tr…
carbon - carbon bonds (with as many hydrogens as needed)
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question 5 what functional group is this? carboxyl sodium sulfhydryl
C. sulfhydryl
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what functional group is this?
Thiol
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question 5 what functional group is this? o= c - oh h - c - ch2 - sh h …
For the first part: The molecule is a steroid because of its four - ring structure. For the second part: The functional group highlighted is a thiol (-SH).
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question 4 what is this molecule? steroid phospholipid monosaccharide
A. steroid
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question 3 which reaction builds a polymer? hydrolysis dehydration ques…
Question 3: B. dehydration Question 4: steroid
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multiple - choice question what does the roman numeral tell you? number…
D. charge of transition metal
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question 1 what molecule is this? a fat a polysaccharide a steroid
a fat
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is the image of the molecule below depicting a monomer or polymer?
Monomer
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what is the formula of the ionic compound between fe³⁺ and o²⁻? fe₆o₆ f…
$Fe_{2}O_{3}$
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multiple - choice question what is the charge of iron here? 2- 3+ 3- 2+
B. 3+, D. 2+
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practice: what is the chemical formula of potassium nitride? hint: pota…
C. $K_3N$
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food is digested in the stomach. * this is a physical change this is a …
1. This is a CHEMICAL change 2. This is a CHEMICAL change 3. This is a CHEMICAL change
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fireworks explode. * 1 point this is a physical change this is a chemic…
1. This is a CHEMICAL change 2. This is a PHYSICAL change 3. This is a CHEMICAL change
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grass grows on a lawn. this is a physical change this is a chemical cha…
1. This is a CHEMICAL change 2. This is a PHYSICAL change 3. This is a PHYSICAL change
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alka - seltzer gives off carbon dioxide when added to water. * this is …
1. This is a CHEMICAL change 2. This is a CHEMICAL change 3. This is a PHYSICAL change
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compare a water molecule, h₂o, to a hydrogen peroxide molecule, h₂o₂. w…
Water and hydrogen peroxide are made from the same types of atoms, but combine in different ways.
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the amount of matter in an object is the objects weight molecules volum…
1. D. mass 2. A. The amount of space an object takes up
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details no additional details were added for this assignment. how do at…
by sharing electrons with each other
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what is the smallest part of a compound called? mixture element molecul…
C. molecule
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which choice is not an example of a molecule? o ncl₃ o o₃ o f o h₂o₂
F
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open - ended question name the following: 1 - pb(clo₂)₄ 2 - c₅n₃ 3 - k₂…
1. Lead(IV) chlorite 2. Pentacarbon trinitride 3. Potassium sulfide
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given a formula, you have learned to write the name. given a name, you …
1) Writing FORMULAS for all types of ionic compounds 2) Writing FORMULAS for binary ionic compounds with transition metals 3) Writing FORMULAS for binary ionic compounds with poly…
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given a formula, you have learned to write the name. given a name, you …
1) Writing FORMULAS for all types of ionic compounds
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what is the formula of phosphorus pentachloride? pci p₅cl pcl₅
PCI₅.
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do you need to know the elements charges to write the formula for a cov…
No
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how do you write the name of a covalent compound? 1) write the name of …
1) Write the name of the first element. 2) Write the name of the second element, but change its ending to -ide. 3) Put a number prefix at the beginning of each element name to tel…
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do you need to know the elements charges to write the name of a covalen…
No
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do covalent compounds contain metal ions? no yes
No
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multiple - choice question when do we need parenthesis in the compound …
When there is multiple of 1 polyatomic ion
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what would be the formula of this compound? □ al₂(co₃)₂ □ alco₃ □ al₂(c…
$Al_{2}(CO_{3})_{3}$
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multiple - choice question what charge does ammonium have? +1 +2 -1 -2
+1
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since transition metals can have different charges, how do we figure ou…
Determine the charge based on the anion's charge and charge - neutrality of the compound.
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in your own words, why do we need roman numerals when writing the names…
Roman numerals are used to indicate the oxidation state of transition metals in compounds for clarity and precision in chemical naming.
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why dont we write roman numeral charges for representative elements? re…
Representative elements can only have one charge; transition metals can have two or more different charges.
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the roman numeral written after the name of a transition metal tells ho…
the charge on 1 atom of the transition metal in that particular compound
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elements, compounds, mixtures color by numbers directions: answer each …
1. C. atom (purple) 2. B. molecule (yellow) 3. B. compound (aqua green) 4. A. molecule (sky blue) 5. C. mixture (green) 6. A. molecule (orange) 7. C. mixture (pink) 8. C. at least…
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what is the trend of electronegativity as you go down a group, top to b…
It Decreases
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multiple - choice question the elements on the bottom left of the perio…
A. really DON'T want to get electrons through bonding
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multiple - choice question which element has the highest electronegativ…
Fluorine
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multiple - choice question if an element has an electronegativity of 4.…
really wants electrons
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cu(s) + 4 hno₃(aq) → cu(no₃)₂(aq) + 2 no₂(g) + 2 h₂o(l) a student analy…
1. Approximately $9.4\%$ 2. Approximately $0.344\ M$ 3. $0.01875\ mol$
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multiple - choice question electronegativity is a measure of an atoms _…
B. Attraction
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multiple - choice question which elements on the periodic table have hi…
B. Top Right
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multiple - choice question it is much harder to take an electron from a…
TRUE
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4. another student also expected 2.63 g of product, but isolated only 2…
93.2%
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multiple - choice question ionization energy is the energy needed to __…
A. Remove
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which is the largest atom? smallest atom? largest: francium smallest: f…
Largest: Francium Smallest: Helium
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for period 2 on the periodic table which element has the smallest radiu…
A. Fluorine
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multiple - choice question why does cs have a larger radius than rb? be…
Because Cs has 1 more electron shell than Rb
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multiple - choice question what happens as you move down group 1? elect…
More electron shells are added
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multiple - choice question what does atomic radius measure? the mass of…
The size of an atom
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multiple - choice question what is a \trend\ in chemistry? a fashion ch…
D. A pattern
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which statement about the balanced equations for nuclear and chemical c…
A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the number of atoms before and after the change.
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which phrase describes transmutation? (1 point) the conversion of an at…
the conversion of an atom of one element into a different element through nuclear changes
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consider the molecule ne₂. part: 0 / 2 part 1 of 2 draw the mo diagram …
A proper MO diagram for Ne₂ should have energy on the y - axis and molecular orbitals labeled on the x - axis. The $\sigma_{1s}$, $\sigma_{1s}^*$, $\sigma_{2s}$, $\sigma_{2s}^*$, …
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the element radium has a mass number of 226 and an atomic number of 88.…
138
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which of these is a common procedural error that could make it seem lik…
B. Losing small amounts of reactant during transfer
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periodic trends practice problems: electronegativity 1. define electron…
1. Electronegativity is the ability of an atom in a chemical bond to attract electrons to itself. 2. Oxygen > Manganese > Germanium > Francium 3. Selenium > Zinc > Vanadium > Tita…
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4 multiple choice 5 points which of the following best describes the la…
Mass remains constant in a closed system, even if substances change form
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are these two substances the same? explain why they are or are not. sub…
No, they are not the same substances because they have different density and melting - point values.
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during a slime - making lab, some students accidentally spill a little …
The mass of products will appear less than the mass of reactants
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11.rank the following elements by decreasing atomic radius: zinc, vanad…
11. Calcium > Vanadium > Titanium > Zinc > Selenium 12. The atomic radius increases as you move from top to bottom within a group. This is because new electron shells are added, i…
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if you mix two substances in a closed container and the reaction produc…
It stays the same
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periodic trends practice problems: atomic radius 1. define atomic radiu…
1. The distance from the nucleus of an atom to its outermost electron shell. 2. Oxygen, Carbon, Aluminum, Potassium 3. Fluorine, Oxygen, Beryllium, Lithium 4. Carbon, Germanium, T…