Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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chemistry: exam 3 test review 1. what is the name of the group of eleme…
1. Noble gases 2. Alkali metals (metals) and halogens (non - metals) 3. Same number of electron shells 4. An electron in the outermost shell of an atom that participates in chemic…
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5) calculate the frequency (in hz) of a photon with a wavelength of 425…
A. $7.05\times 10^{14}\ Hz$ ### 6)
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practice: experimental design read each scenario and answer the questio…
1. Presence of bread 2. Moistness of brownies 3. If bread is placed with brownies, the brownies will stay moist longer 4. Brownies without bread 5. Brownies with bread 6. Size of …
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chapter 3 states of matter wordwise use the clues and the words below t…
Hidden Term: States of Matter Definition: The different forms in which matter can exist, including solid, liquid, and gas, and the phase changes between them such as evaporation, …
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7. how many grams of carbon are in 15.0g of co₂? 8. how many grams of h…
4.09 g ### 8. How many grams of hydrogen are in 12.0g of H₂O?
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for centuries, human and animal muscle pulled plows and wagons and oper…
1. It could do more work with less muscle - power and was not limited by wind or water power, enabling continuous and large - scale operation of machinery. 2. A legal right giving…
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gatorade is made by mixing purified water with sugars, electrolytes lik…
The type of change in making Gatorade is a physical change. Evidence: Combining purified water, sugars, electrolytes, and flavorings does not create new substances; it's just a mi…
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12. na2o(s) + h2o(ℓ) → naoh(aq) → na+(aq) + oh−(aq) 13. k2o(s) + h2o(ℓ)…
12. \(Na_2O(s)+H_2O(l) ightarrow NaOH(aq)\), \(NaOH(aq) ightarrow Na^{+}(aq)+OH^{-}(aq)\) 13. \(K_2O(s)+H_2O(l) ightarrow KOH(aq)\), \(KOH(aq) ightarrow K^{+}(aq)+OH^{-}(aq)\) 14.…
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how do different factors affect solubility? check all of the boxes that…
- Increasing temperature decreases the solubility of gases. - Increasing pressure increases the solubility of gases.
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pre - investigation questions before watching the demonstration, predic…
1. Stirring sugar in water will dissolve faster because it increases the rate of contact between sugar and water molecules. 2. Crushed ice will melt faster in warm water as it has…
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procedure: complete and balance the equations below. to help supply the…
1. $8O_2$ 2. $5O_2$ 3. $C(s), O_2(g)$ 5. $H_2SO_4(aq)$ 6. $P_4O_{10}(s)+6H_2O(l) ightarrow4H_3PO_4(aq)$ 7. $H_2CO_3(aq)$ 8. $4Li, O_2$ 9. $2Mg, O_2$ 10. $2Ca, O_2$ 11. $Ba, O_2$ 1…
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lab station 3. substances: elements versus compounds in our life we wor…
1. Aluminum (Al) is the element. Table - salt (sodium chloride: NaCl) is the compound. Determined by checking if the name is on the Periodic Chart (Al is, NaCl is a combination of…
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in our life we work almost exclusively with compounds, but a few object…
Aluminum (Al) is the element. Sodium chloride (NaCl) is the compound. Reason: Elements are on the periodic table, compounds are made of multiple elements. Element 1 - Hydrogen, H …
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there are a number of mixtures that are solid at room temperature. bras…
1. Brass is homogeneous. Test: Analyze composition of multiple small samples from different parts using spectroscopy. 2. Soil is heterogeneous. Test: Visual observation of differe…
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4. record the volume shown by each graduated cylinder and label each me…
Top cylinder volume = 2.6 units, Bottom cylinder volume = 23 units
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as shown in the diagram below, when water freezes in the cracks of rock…
mechanical weathering
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question 1 1 pts which element has 9 protons? beryllium potassium fluor…
Question 1: C. fluorine Question 2: 39
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question 1 1 pts which element has 9 protons? beryllium potassium fluor…
Question 1: C. fluorine Question 2: 39
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1. made up of two types of matter that can be physically separated 2. m…
1. Mixture - a 2. Heterogeneous Mixture - b 3. Homogeneous Mixture - c 4. Matter - g 5. Element - d 6. Compound - e 7. Meter - a 8. Kilo - (no specific match in given right - hand…
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13 multiple choice 1 point which of the following is not an example of …
B. Calcium
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which scenario best demonstrates how social values influence financial …
Purchasing a luxury car to impress colleagues and maintain social status
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jose needs 6.2 lb of organic blueberries to make smoothies. organic blu…
Jose incorrectly rounded $2.85$ down to $2$. The estimate should be $18$.
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multiple choice 1 point ethans arms are crossed, and hes leaning away f…
Identify the feelings behind the words
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6. a student decides it is possible to estimate the capacity of a test …
6. $0.5\%$ 7. $\approx0.96\%$ 8. $\approx0.023\%$ 9. $\approx0.66\%$ 10. The percent errors are equal, approximately $9.26\%$ for both students.
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directions: complete the sentences by writing the letters of the correc…
16. b. atom 17. a. colloid 18. b. solution
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directions: choose the correct category from the list for each item. ea…
1. b. compound 2. a. element 3. d. heterogeneous mixture 4. e. homogeneous mixture 5. d. heterogeneous mixture 6. b. compound 7. b. compound 8. f. colloid 9. e. homogeneous mixtur…
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# question answer a answer b answer c answer d 1 this term describes co…
1. D. Organic 2. B. 4 3. D. All are correct 4. A. Functional groups 5. A. Phosphate 6. B. Hydroxyl 7. A. Amino 8. D. Carboxyl 9. C. Macromolecule 10. B. Polymerization 11. D. Mono…
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directions: circle the term in parentheses that makes each statement co…
7. invisible, can 8. physical 9. chemical 10. conserved
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which option best describes the carbon structure below? ¿qué opción * 2…
Chain / Cadena
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carbon forms bonds with other atoms. carbon can form up to * 20 points …
Covalent, 4; Covalente; 4
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use the passage to answer the question. with that reflection gortsby ro…
the rising action
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heterogeneous compound elements substances homogeneous mixtures matter …
1. Substances 2. Elements 3. Compounds 4. Mixtures 5. Homogeneous mixtures 6. Heterogeneous mixtures
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which option best describes the carbon structure below? / ¿qué opción d…
B. Chain / Cadena
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which option best describes the carbon structure below? / ¿qué opción *…
Ring / Anillo
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which would be considered an empirical formula? o h₂o o h₄n₈ o n₂h₄ o c…
$H_2O$
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a compound is formed through the mixture of two or more elements. o tru…
False
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the compound is the indivisible form of matter. true false
False
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20. what does caco₃ represent? a chemical subscript. a chemical reactio…
D. A chemical formula.
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physical science m (prescriptive) (gp) / chemical interactions / 03 - c…
D. They are the reactants.
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18. what always occurs during a chemical reaction? a change in color. a…
# Breve Explicación: En una reacción química, siempre hay un cambio en la energía. Esto se debe a que se rotura y forma enlaces químicos, lo que implica un intercambio de energía.…
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what does the empirical formula show? o the atomic radius o the atomic …
the atomic ratio
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which would be considered a molecular formula, but not an empirical for…
A. $N_2H_4$
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17. the ____ of a compound shows the ratio of elements present in the c…
chemical formula
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16. what is the only sure evidence for a chemical reaction? changes in …
The production of one or more new substances.
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15. in a chemical equation, numbers often appear in front of a chemical…
The number of molecules or atoms of each substance in the reaction.
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u3:pretest physical science m (prescriptive) (gp) / chemical interactio…
D. All three indicate chemical change.
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what is happening to the flame in the candle above? it is undergoing a …
# Breve explicación: La combustión de una vela es un proceso químico. Cuando la vela se quema, el parafina (sustancia de la vela) reacciona con el oxígeno del aire para formar dió…
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03:pretest physical science m (prescriptive) (gp) / chemical interactio…
D. can enter from or escape to the surroundings
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11. what is a shorter, easier way to show chemical reactions, using sym…
C. a chemical equation
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10. what happens when chemical bonds break and new bonds form? a physic…
C. a chemical reaction
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9. what does every chemical reaction involve? a change in mass. a chang…
C. A change in energy.
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14. human hair is ___. a. never used for hair replacement products b. a…
14. b. a desirable choice for a quality hair solution 15. c. Human 16. a. Human 17. b. when washed 18. b. to create a softer and more natural look 19. c. onion skin 20. b. Hackling
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8. which is the correct chemical equation for the following statement? …
# Explicación: ## Paso 1: Comprobar la ley de conservación de la masa Una ecuación química correcta debe tener el mismo número de átomos de cada elemento en ambos lados de la ecua…
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03:pretest physical science m (prescriptive) (gp) / chemical interactio…
# Breve explicación: Las propiedades químicas de una sustancia se observan cuando la sustancia experimenta una reacción química, lo que significa que se transforma en una sustanci…
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03:pretest physical science m (prescriptive) (gp) / chemical interactio…
D. Change it into a different substance.
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6. in chemical reactions, what does the principle of conservation of ma…
Matter is not created or destroyed.
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5. what is the number placed below an elements symbol in a chemical for…
# Breve explicación: En una fórmula química, el número colocado debajo del símbolo de un elemento se llama subíndice. Un coeficiente es un número que se coloca delante de una fórm…
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4. how is a chemical reaction that absorbs energy in the form of heat d…
# Breve explicación: Una reacción química que absorbe energía en forma de calor se denomina reacción endotérmica. Las reacciones exotérmicas liberan calor, la combustión es un tip…
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how many valence electrons are in a carbon atom? * 1 point 2 4 5 6
B. 4
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which model correctly depicts a sulfur atom? * 1 point option 1 option …
Option 2
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3. which is the number placed in front of an elements symbol in a chemi…
# Breve explicación: En una fórmula química, el coeficiente es el número que se coloca delante del símbolo de un elemento o de una molécula. El subíndice está ubicado abajo y a la…
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what element is shown in the bohr model shown below? * carbon oxygen ni…
Carbon
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2. what type of change is the process of solid ice changing into liquid…
C. physical
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what element is depicted in the bohr model shown below? * 1 p carbon si…
Silicon
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1. what is chemistry? the study of matter and how matter changes. the s…
La primera opción. The study of matter and how matter changes.
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1. what is the definition of matter? give an example of something that …
Matter is anything that has mass and takes up space. An example of something that is not matter is light. 2. | |Particle Structure|Compressibility|Motion of Particles|Shape|Volume…
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5. because ions in an ionic crystal are tightly bound together, ____. i…
# Breve Explicación: En un cristal iónico, los iones están fuertemente unidos. Esto significa que los partículas cargadas no pueden moverse libremente. La conducción de corriente …
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4. an ionic compound can conduct electricity when ____. its crystals ar…
# Breve Explicación: Los compuestos iónicos conductan electricidad cuando los iones están libres para moverse. En estado sólido, los iones están en una red cristalina fija y no pu…
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3. ionic bonds are strong; therefore, ionic compounds ____. cannot be b…
melt at high temperatures
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2. which is true of ionic compounds? they have characteristically low m…
They form hard, brittle crystals with characteristic shapes.
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1. why do ions in an ionic compound typically form an orderly crystal s…
# Breve explicación: Los iones en un compuesto iónico se organizan en una estructura cristalina ordenada debido a las fuertes fuerzas de atracción electrostática entre iones de ca…
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a. use function notation to represent “the student has english at 10:00…
a. Let \(S(t)\) represent the subject the student has at time \(t\). Then \(S(10:00)=\text{English}\) b. The function \(C(t)\) gives the subject at time \(t\). The statement \(C(1…
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2. find $\frac{8.5\times10^{5}}{1.3\times10^{2}}$. write your answer in…
$4.23\times 10^{1}$
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a. p(0)=0 b. p(4)=10 c. p(10)=4 d. p(20)=0 1. after 20 minutes, the bat…
## 1. A. $P(0) = 0$ corresponds to "The bathtub starts out with no water." B. $P(4)=10$ corresponds to "The height of the water is 10 inches after 4 minutes." C. $P(10)=4$ corresp…
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regularly dissolve in water: 20. what allows solid water (ice) to be le…
20. Hydrogen bonding causes water molecules in ice to form a more open hexagonal lattice structure, increasing the space between molecules and making ice less dense than liquid wa…
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19. what does it mean that water is the “universal solvent”? list five …
Salt, sugar, baking soda, vinegar, ammonia
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13. how does information pass through the neuron? 14. identify each of …
13. Information enters dendrites as electrical - chemical signals, travels as an action potential along the axon, and neurotransmitters are released at the axon terminal to cross …
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leveled practice in 1 and 2, complete the expressions to 1. simplify th…
$9.6002\times 10^{-6}$ ### 2. Find $\frac{6.5\times 10^{11}}{1.3\times 10^{8}}$
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explain why the biodegradation of plastic might be more hazardous to th…
The biodegradation of plastic can release harmful chemicals like micro - plastics and toxic additives into the environment, which can enter the food chain and cause more widesprea…
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column a 1. nicotine 2. carcinogen 3. short term effect 4. long term ef…
1. i 2. e 3. n 4. g 5. f 6. p 7. a 8. k 9. h 10. c 11. l 12. b 13. d 14. m 15. j 16. o
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question 13 (1 point) use your anchor charts to answer, which is not a …
Question 13: A. Anxiety Question 14: B. Chronic Bronchitis Question 15: True
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the owner of an organic pet food store would like to analyze the sales …
$15\%$
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how many chemical bonds can carbon form with other elements? 1 2 3 4
# Explicación: ## Paso 1: Considerar la valencia del carbono El carbono tiene 4 electrones de valencia. ## Paso 2: Relacionar con enlaces químicos Puede formar hasta 4 enlaces quí…
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multiple - choice question compounds must be separated using a chemical…
True
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what is being shown on the screen now? (choose 3 that are true.) two di…
two different elements, two different types of molecules, two different pure substances
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2021 pc physical/chemical changes, pha... multiple - choice question wh…
element
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which of the following is a molecule? carbon dioxide (co₂) iron (fe)
Carbon dioxide ($CO_2$)
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2024 ipc physical/chemical changes, pha... types of matter, elements, c…
Solid sodium and chlorine gas forming sodium chloride (salt)
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physical/chemical changes,pha... multiple - choice question this type o…
A. Chemical
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why do you need to know the temperature of the reaction? (select all th…
The rate constant k is affected by the temperature. The rate of the reaction depends on the temperature of the solution. The Arrhenius Equation is based on the reaction being run …
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what can you do to determine the order of the phenolphthalein reaction …
plot 1/absorbance vs. time, plot the ln absorbance vs. time, plot the absorbance vs. time
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# of protons: 10 # of neutrons: 11 # of electrons: 10 what element is i…
8. The subatomic particle that determines the identity of the element is the proton. 9. An atom is stable when its out - most electron shell is full. An atom is neutral when the n…
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if any chemical gets on your hands, or any other part of your body, you…
Other (The most appropriate immediate action is usually to wash the affected area with plenty of water immediately. Since this option is not given, the best choice is 'Other'.)
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(co) and nickel (ni) are metals, sulfur (s) is a nonmetal, and antimony…
Niobium (Nb) is a metal. Astatine (At) is a metalloid.
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what is a column on the modern periodic table called? a metal b period …
d. group
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which particles in the nuclei of atoms are used to arrange the elements?
Protons
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the tide rises, the tide falls by henry wadsworth longfellow the tide r…
It strengthens the connection between the two lines.
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blimps were once filled with hydrogen, but now helium is used instead. …
A. Hydrogen is flammable, while helium is not.
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what is the only nonmetal that is a liquid at room temperature? a chlor…
C. bromine
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properties of nonmetals include a high boiling point. b ability to cond…
C. dull appearance