Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
-
which statement best explains why heating a liquid affects its viscosit…
The molecules move faster at higher temperatures and overcome attractions more easily.
-
waters molar mass is 18.01 g/mol. the molar mass of glycerol is 92.09 g…
glycerol because it is more viscous and has a larger molar mass
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 10 which of these is …
reactivity
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 which is an intensive…
density
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 10 a student investig…
The student investigated more physical properties than chemical properties of lead.
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 which of these is an …
sugar dissolving in warm water
-
16. which has more atoms: 2.5 mol of calcium carbonate, $\text{caco}_3$…
16. 3.5 mol of calcium hydroxide ($\text{Ca(OH)}_2$) has more atoms. 17. $45.0\ \text{g}$ 18. $3.61\times10^{24}\ \text{atoms}$ 19. $0.435\ \text{mol}$ 20. $2.96\times10^{24}\ \te…
-
15 if you are writing a persuasive essay in favor of banning performanc…
A. Athletes have always used artificial means to increase their advantage.
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 which list includes onl…
property (involves chemical change). - Option2: Boiling point, conductivity, color are all physical properties (no chemical change needed to observe/measure). - Option3: Flammabil…
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 10 which statement de…
It can be reshaped by a force.
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 58:…
a chemical change in step 1 and a physical change in step 2
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 which of these is an …
volume
-
garage/storage bedroom living room dining room other area questions 1. …
1. What were the most common hazardous chemicals in your home/work? Bleach, drain cleaner, paint, and cold medicine are common examples. 2. Circle the hazardous or toxic chemicals…
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 59:…
A. He is identifying the metal using physical properties only.
-
changes in matter quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 59:…
A. He is identifying the metal using physical properties only.
-
the arguments about smoking are usually centered around its effects on …
B. Smoking not only produces negative effects on human health but also on the environment.
-
investigation 51. for each pair listed, which has more representative p…
a. They have the same number of representative particles b. 0.75 mol $\text{H}_2$ c. 3.0 mol $\text{SnO}_2$ d. 0.33 mol $\text{Fe}_2\text{O}_3$ --- ### Question 2
-
acid deposition causesthe ph scalethis is the ph scale with some exampl…
neutral
-
normal rain, which has not been contaminated by pollutants, has what ph…
Slightly acidic
-
which method involves solving one equation for one variable and substit…
1. b. Substitution 2. d. Business and economic forecasting
-
sulfur dioxide and nitrogen dioxide are both primary pollutants. what d…
Water
-
making predictions about reactions choose the correct products for the …
$\text{KNO}_3 + \text{AgCl}$ (the second option)
-
making predictions about reactions choose the correct products for the …
$\text{KNO}_3 + \text{AgCl}$ (the second option)
-
making predictions about reactions choose the correct products for the …
PbSO₄ + MgCl₂
-
1. electric charge2. static electricity3. electrical force4. coulomb5. …
### Matching Section (corrected): 1. Electric charge → C. Property of matter responsible for electrical events; it has two forms, positive and negative. 2. Static electricity → E.…
-
making predictions about reactions complete the following equations (no…
For $\text{Al} + \text{AgCl} ightarrow$: $\text{AlCl}_3 + \text{Ag}$ For $\text{Mg} + \text{Ca(OH)}_2 ightarrow$: no reaction
-
making predictions about reactions complete the following equations (no…
For $\text{Al} + \text{AgCl} ightarrow$: $\text{AlCl}_3 + \text{Ag}$ For $\text{Mg} + \text{Ca(OH)}_2 ightarrow$: no reaction
-
making predictions about reactions complete the following equations (no…
A. $\text{AlCl}_3 + \text{Ag}$
-
limiting reactants da 1. given the reaction: $ce{s + o_{2} -> so_{2}}$ …
a) $219.76\ \text{g}$ b) $173.0\ \text{g}$ c) Oxygen d) $173.0\ \text{g}$
-
phase changes quiz complete 1 2 3 4 5 6 7 8 9 10 time remaini 57:55 h₂o…
from a gas to a liquid
-
phase changes quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 58:16 i…
solid turns directly into a gas, matching the description. - Evaporation is liquid to gas, freezing is liquid to solid, deposition is gas to solid, so they do not fit.
-
phase changes quiz complete 1 2 3 4 5 6 7 8 9 10 the diagram below show…
A. Molecules are speeding up as boiling occurs.
-
2) what is the percent yield of the reaction below if 84.0 grams of $\t…
80.8%
-
in this reaction: $ce{mg(s) + i_{2}(s) -> mgi_{2}(s)}$ if 10.0 g of mg …
Approximately 84.5%
-
writing formulas ( criss-cross method)directions: write the formulas of…
| | $\text{F}^-$ | $\text{O}^{2-}$ | $\text{N}^{3-}$ | $\text{S}^{2-}$ | $\text{SO}_4^{2-}$ | |--|--|--|--|--|--| | $\text{Fe}^{3+}$ | $\text{FeF}_3$ | $\text{Fe}_2\text{O}_3$ | $…
-
ionic bonding 6.1-6.3 test directions: using a periodic table, fill in …
| Number of Protons (+) | Number of Electrons (-) | Overall charge | Symbol and Charge | Cation (C) Anion (A) Neutral (N) | |------------------------|--------------------------|--…
-
1 pointthe smoke inhaled from a burning cigarette contains a mix of ove…
1. 7000 2. 70 3. Melanoma
-
name: homework phosphorus trichloride is a slightly yellow fuming liqui…
Lewis dot diagram for $\text{PCl}_3$: ``` .. :Cl:P:Cl: .. :Cl: .. ``` (Note: The central P has one lone pair, each Cl has three lone pairs, and single bonds connect P to each Cl.)…
-
baking soda, or sodium bicarbonate, is used in baking to ______ foods l…
D. encourage
-
baking soda, an alkaline chemical formula, is used in baking to make ca…
D. achieve
-
if human minds were as uniform as atoms of the same elements or molecul…
C. predictable
-
the third type of chemical bonding, metallic bonding, occurs between me…
- Valence electrons move freely throughout a metal. - Metallic bonding occurs between metal atoms.
-
use the activity series below to predict the products of each of the fo…
NaCl + Ag
-
1 point cigar users cannot be exposed to nicotine because they dont ful…
1. False 2. True 3. False
-
making activity series predictions use the activity series below to pre…
NaCl + Ag
-
chemistry resources ionic compounds can be represented by bohr model di…
A. A sodium cation has zero valence electrons. C. Both the Bohr model and the Lewis dot structure represent an ionic bond between a metal and a nonmetal. D. Valence electrons are …
-
solids and plasmas quiz complete 1 2 3 4 5 6 7 8 9 10 which best explai…
cannot be pushed closer together, making the crystal incompressible. The other options are incorrect: solid molecules vibrate in place (so A is wrong), crystal molecules do not ac…
-
chemistry resources covalent compounds can be represented by bohr model…
- There are two bonding electrons in a chlorine molecule. - A chlorine molecule has 14 total valence electrons.
-
there are three types of chemical bonds: covalent, ionic, and metallic.…
A covalent bond forms between two **nonmetal** chlorine atoms. Before reacting, each chlorine atom has **7** valence electrons. When **2** electrons are shared, each chlorine atom…
-
sodium metal (na), chlorine gas ($cl_2$) and table salt (nacl) have dif…
- electrons are transferred: bonds in table salt - electrons are shared: bond in chlorine gas
-
1. $\boldsymbol{agno_2}$ |element|atoms|mass|total| | ---- | ---- | ---…
### $\text{AgNO}_3$ | Element | Atoms | Mass (g/mol) | Total (g/mol) | |---------|-------|--------------|---------------| | Ag | 1 | 107.87 | $1 \times 107.87 = 107.87$ | | N | 1 …
-
1) what is the term for something that attaches dye molecules to textil…
1) A mordant is the substance 2) Iron produces dull, dark colors and can weaken fibers. 3) To remove impurities, concentrate active components, and ensure consistent, effective dy…
-
when two atoms with different electronegativities form a bond, the more…
When sulfur and oxygen react, valence electrons are **shared** between the atoms because their EN difference is **less than** two. When magnesium and oxygen react, valence electro…
-
chemistry resources when forming chemical bonds, metal atoms tend to lo…
- In general, metal atoms have lower electronegativities than nonmetal atoms. - When sulfur bonds to oxygen, electrons are more strongly attracted to the oxygen atom. - Atoms with…
-
multiple choice questions 1. which process occurs in the suns core to r…
1. C. Nuclear fusion 2. B. Stellar life span model 3. C. Evidence of nuclear fusion and energy output 4. B. It began as a single, dense point and has been expanding ever since.
-
chemical bonds form when atoms share valence electrons or when one atom…
- Oxygen atoms tend to gain or share electrons when forming chemical bonds. - Magnesium atoms tend to lose electrons when forming chemical bonds. - Atoms with three or fewer valen…
-
empirical and molecular formula calculation propene has an empirical fo…
$\text{C}_3\text{H}_6$
-
making activity series predictions think about it use the activity seri…
Ca₃(PO₄)₂ + Zn
-
making activity series predictions use the activity series below to pre…
NaCl + Ag
-
is an example of○ energy transformation○ law of conservation of energy○…
- Incomplete top question: Cannot be answered without the referenced scenario. - Energy type question: A. Chemical - Mass conversion question: 0.625 kg (the corresponding option, …
-
select the correct answer a chemist is performing an experiment by obse…
C. from hour 0 to hour 5
-
making activity series predictions use the activity series below to pre…
no reaction
-
making activity series predictions use the activity series below to pre…
B. $\text{K}_2\text{CO}_3 + \text{Na}$
-
mass x gravity x height is the formula for *○ kinetic energy○ mechanica…
1. Gravitational Potential Energy 2. mass, velocity (speed) 3. Sorry, the text for the third question is incomplete. Please provide the full question details to answer it.
-
a block has a mass of 23 grams and a volume of 10 cm³. using the table …
Glass
-
reactions you may have noticed an (s) next to one of the products in so…
1. $\text{CdS}$ 2. $\text{Fe(OH)}_3$ 3. barium carbonate
-
you may have noticed an (s) next to one of the products in some double …
1. $\text{CdS}$ 2. $\text{Fe(OH)}_3$ 3. $\text{BaCO}_3$
-
1. a plastic toy with a mass of 18 g occupies 9 cm3 of space. its densi…
1. 2.0 g/cm3 2. 22 cm3 3. Cannot be solved: Required reference table is not provided.
-
predict the products of the double replacement reactions given. check t…
$\text{BaSO}_4 \text{(s)} + \text{MgCl}_2$ (corresponding to the fourth option)
-
11. what is the correct procedure for students to follow if a chemical …
11. c) Stand back and advise the teacher of the spill. 12. d) things in an experiment that don't change 13. b) Quantitative
-
reactions predict the products of the double replacement reactions give…
$\text{NaNO}_3 + \text{AgCl (s)}$
-
try it reactions predict the products for the single replacement reacti…
$\text{ZnCl}_2 + \text{H}_2$
-
liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time re 56: glycerol boils a…
boils at a higher temperature than water, its intermolecular attractive forces must be stronger.
-
liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaini 56:31 which ter…
naturally mix without an agent, immiscible liquids do not mix on their own, and compressed molecules are unrelated to this mixing function.
-
liquids quiz complete 1 2 3 4 5 6 7 8 9 10 what is produced on the top …
surface tension
-
part 2: write out and balance: iron and oxygen react to form iron (iii)…
3. $160\ \text{g}$ (rounded to 2 significant figures) 4. $2.00\times10^{23}$ molecules
-
liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remain 57:08 which proc…
boiling
-
liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 57:30 carla m…
way that causes forward motion, it does not significantly increase water molecule kinetic energy to move the boat, and soap mixes with water (it is not immiscible) rather than for…
-
liquids quiz complete 1 2 3 4 5 6 7 why are liquids well suited for hyd…
The other options are incorrect: liquid density is not the key factor, liquids do not change volume easily (they are incompressible), and the number of molecules is irrelevant to …
-
predict the products for the single replacement reactions given. check …
$\text{CaCl}_2 + \text{Mg}$
-
liquids quiz complete 1 2 3 4 5 6 7 8 9 which type of substance is wate…
" rule. It dissolves ionic substances by hydrating ions, and also dissolves polar substances via hydrogen bonding and dipole-dipole interactions.
-
liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 58:54 the par…
Water particles have strong intermolecular forces.
-
liquids quiz complete 1 2 3 4 5 6 7 8 9 10 what happens when a solid is…
olved solids (floating, sinking, suspending) rather than dissolution.
-
temperature of chemical reactions over time 3. label the chemical react…
**Endothermic** - Citric acid and baking soda - Ammonium Chloride **Exothermic** - Calcium chloride - Sodium sulfate
-
limiting reactions worksheet 3 part 1: first, write out and balance the…
Limiting reactant: $\text{P}_2\text{O}_5$; Mass of phosphoric acid: ~54 g --- ### Problem 2
-
2 select the correct answer from each drop-down menu. complete the foll…
First blank: National Environmental Policy Act (NEPA) Second blank: Love Canal
-
invitation if you are a dreamer, come in, if you are a dreamer, a wishe…
a. BAAABBB
-
name: _________________________ percent comp. worksheet find the percen…
$\ce{Al2(SO4)3}$: Al: 15.77%, S: 28.12%, O: 56.11% $\ce{CuBr2}$: Cu: 28.45%, Br: 71.55% $\ce{NaOH}$: Na: 57.48%, O: 40.00%, H: 2.52% $\ce{(NH4)2S}$: N: 41.18%, H: 11.76%, S: 47.06…
-
# 6 on the diagram fill in the phase changes in the blank provided. pha…
b. evaporation
-
question 5 (1 point) # 5 on the diagram fill in the phase changes in th…
a. condensation
-
# 6 on the diagram fill in the phase changes in the blank provided. pha…
b. evaporation
-
# 3 on the diagram: fill in the phase changes in the blank provided. ph…
d. sublimation
-
# 2 on the diagram: fill in the phase changes in the blank provided. ph…
a. freezing
-
question 5 (1 point) # 5 on the diagram fill in the phase changes in th…
a. condensation
-
select all the correct answers. which two scientific theories were deve…
- three laws of motion - law of gravity
-
20 if a bond had a electrongativity of 1.7 and higher, what type of bon…
A. ionic bond
-
chemistry unit 6 stoichiometry homework / notes packet limiting reactan…
1. Limiting reactant: Magnesium ($\text{Mg}$) 2. Mass of magnesium peroxide: $\approx 27.8$ grams
-
30 which contains covalent bonds? zncl₂ k₂s co₂ nacl types of chemical …
CO₂
-
which of these is an empirical formula? $ce{co_{2}}$ $ce{c_{3}h_{6}}$ $…
$\text{CO}_2$
-
vitamin dthe down-low on vitamin dusing vitamin d to prevent bone lossb…
1. First blank: absorb (matches the function of vitamin D for calcium; note: if restricted to the dropdown, the intended functional term aligns with enabling the body to take in c…