Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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chemistry i s1: sci6111s1 9 chemistry i s1 (lms) 3 - d assessment: chem…
A. The resulting sodium cation has a stable octet in its valence shell. B. The resulting chlorine anion has a stable octet in its valence shell. E. The electrostatic attraction be…
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chemistry i st: sci6111s1 9 chemistry i s1 (lms) 3 - d assessment: chem…
A sodium atom has 1 valence electron(s). A chlorine atom has 7 valence electron(s).
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chemistry i si scibi1ms1 9 chemistry i si (lms) 3 - d assessment: chemi…
B. The compounds in which bromine bonds with a metal have higher melting points than the compounds in which bromine bonds with a nonmetal. D. The compound with the lowest melting …
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chemistry i si: sci8ti1s1 9 chemistry i si (lms) 3 - d assessment: chem…
B. The compounds in which bromine bonds with a metal have higher melting points than the compounds in which bromine bonds with a nonmetal; C. The compound with the highest melting…
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the symbol for cadmium is cd, and it’s found in group 12 on the periodi…
B. 112.41
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use naming rules to explain why the following statement is not correct.…
The correct name should be lead(IV) chloride because lead is a transition - metal and its oxidation state (+4 in this case) must be indicated with Roman numerals in the compound's…
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periodic table which of the molecules has the highest boiling point? en…
4
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chemistry i si sci8tis1 9 chemistry i si (lms) 3 - d assessment: chemic…
Beaker IV, Beaker III, Beaker II, Beaker I
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chemistry i sci101ms1 9 chemistry i si (lms) 3 - d assessment: chemical…
Correct Lewis Structures for Carbon Dioxide: I, III Incorrect Lewis Structures for Carbon Dioxide: II, IV
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7 which best describes the transformation of energy of a rollercoaster?…
The potential energy of the rollercoaster is converted into kinetic energy when it is moving.
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periodic table which of the following statements about covalent bonds a…
B. Covalent bonds hold the atoms together in discrete molecules. C. Covalent bonds form when atoms of nonmetals are close enough to each other for their orbitals to overlap. D. Co…
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a team of scientists have synthesized a new element. theyd like to name…
A. Fg
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a team of scientists have synthesized a new element. theyd like to name…
A. Fg
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periodic table which of the following statements about metals are true?…
A. Metals can be drawn into wires C. Metals can be hammered into different shapes D. Metals in solid form have specific crystal structures F. The sea of electrons holds metal anio…
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periodic table which of the following lewis structures correctly repres…
A. :Cl:⁻ Ca²⁺ :Cl:⁻
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periodic table. fill in the blanks to complete the sentences. the octet…
valence
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get it? classify which techniques for separating mixtures depend on pha…
Techniques like distillation and evaporation - condensation depend on phase changes. Distillation uses liquid - to - gas (vaporization) and gas - to - liquid (condensation) change…
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periodic table fill in the blanks to complete the sentences the octet r…
First blank: electrons; Second blank: outermost
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8. describe btb. 9. name three conditions where changes in proton conce…
BTB is a pH - indicator. Three conditions are acidic, neutral, and basic. Table filled as above.
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part c matching match each description in column b to the correct term …
15. d. measure of the space occupied by an object 16. i. the amount of matter that an object contains 17. c. matter that has a uniform and definite composition 18. a. a quality or…
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get it? compare and contrast the mobile phase with the stationary phase…
The mobile phase moves and carries the sample, while the stationary phase is fixed and interacts with the sample for separation.
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6. explain why measurement is essential in chemistry.
Measurement is essential in chemistry for accurate determination of substances' amounts, reaction - conditions, and material properties, which aids in equation - formulation, stoi…
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4 mixtures of matter (continued) get it? predict the result of trying t…
The spices will be retained on the filter paper while the oil and vinegar will pass through the filter paper.
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drag the correct answer to the box. which counter - claim would help ba…
Herbicides quickly kill weed roots while preserving grass, making them efficient and easy gardening tools.
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name: match the letter with the color answer a. atomic # 17, used to ki…
A. Chlorine Green B. Bromide Brown C. Carbon Red D. Helium Brown E. Nitrogen Blue F. Sodium Blue G. Hydrogen Blue H. Mercury Brown J. Aluminum Brown N. Calcium Yellow O. Magnesium…
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people properties of matter class activity per: 1 date ____ chemistry a…
for Part B: 11. AT; Matter is defined as anything that has mass and occupies space. 12. NT; Liquids take the shape of their container and do not have a definite shape on their own…
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question 5 1 pts which option correctly matches the characteristics of …
B. Ionic bonds occur between metals and non - metals; atoms gain or lose electrons. Covalent bonds occur between non - metals; atoms share electrons.
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graphing periodic properties the periodic table relies on patterns and …
1. There is no simple linear relationship between atomic numbers and melting points. Trends vary among different groups. For some groups, melting - point may increase with atomic …
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when we draw pictures of molecules we often use a single solid line to …
C. N≡N
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covalent bonding is typically explained as a bond that forms when atoms…
Atoms are both trying to attract the same electrons, causing a situation where both atoms are pulled together.
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in order to build an ionic compound that sticks together you need atoms…
1. Opposite charges 2. Ionic bonds form between metals and nonmetals because metals form positive ions and non - metals form negative ions.
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identify five techniques that take advantage of different physical prop…
Technique 1: Filtration How it is done: Use a filter paper. Liquid passes through, solid is retained. Technique 2: Evaporation How it is done: Heat the mixture, liquid evaporates,…
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12. oxygen reacts with iron to produce rust and with hydrogen to produc…
A. New molecules are formed but the same elements are found
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11. a scientist studies the following chemical equation for the product…
mass of oxygen decreases
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sodium sulfate and barium chloride react with each other to form sodium…
The mass of the reactants is the same as the mass of the products.
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in the late 1700s, antoine lavoisier performed a series of experiments …
B. conservation of mass
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q 8. the equation below shows a chemical reaction. according to the law…
$7.32$ grams
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q7. the table below shows the data collected on four substances that we…
Substance 1
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q: a solution with a ph of 2 can be increased to a ph above 7 by adding…
a base
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1. **carbon dioxide has a formula of co₂. use this knowledge to represe…
# Explanation: ## Step1: Understand carbon - dioxide phase changes Carbon dioxide can undergo sublimation (solid to gas) without passing through the liquid phase under normal atmo…
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5. if an aqueous solution has a slippery feel, which type of solution w…
a basic solution
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a type of juice has a sour taste and turns a piece of litmus paper red.…
Acidic
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unsweetened chocolate has a very bitter taste. what does this taste ind…
They are basic
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what is one of the characteristics of an acidic compound? sour taste un…
sour taste
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1. calcium carbonate is used to treat acid reflux, which is sometimes c…
Calcium carbonate neutralizes acid in the stomach.
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q1 calcium carbonate is used to treat acid reflux, which is sometimes c…
It reacts with hydrochloric acid in the stomach to form calcium chloride, water, and carbon - dioxide gas.
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section 3: predicting the products of chemical reactions predict the pr…
1. No reaction, No reaction 2. No reaction, No reaction 3. 2H₂O, Synthesis reaction 4. Mn(NO₃)₂ + 2H₂O, Acid - base (neutralization) reaction 5. No reaction, No reaction 6. Cu(CN)…
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4 mixtures of matter (continued) get it? summarize the different types …
Matter includes pure substances (elements and compounds) and mixtures. Elements are the simplest, compounds are formed from elements chemically, and mixtures are physical combinat…
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9) brass is an alloy of copper (cu) and zinc (zn). if 8.32 g of copper …
A. $1.10\times 10^{23}$ metal atoms
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9) brass is an alloy of copper (cu) and zinc (zn). if 8.32 g of copper …
A. $1.10\times 10^{23}$ metal atoms
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question 3. complete the table for the following elements. element: chl…
| Element | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons | |---|---|---|---|---|---| | Chlorine | 17 | 35 | 17 | 17 | 18 | | Potassiu…
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question 2. consider the nuclear notation below. 23 11 na what is the n…
11 protons, 12 neutrons, 11 electrons
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question 1. which of the following statements are true about an atom wi…
It has 15 protons. It has 15 electrons if it is neutral. It has 16 neutrons.
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26. graph create a graph that illustrates the law of multiple proportio…
The graph will have the mass of one element on the x - axis and the mass of the other element that combines with it on the y - axis. Data points for different compounds formed by …
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1. physical change: 2. distillation: 3. chemical property: 4. chemical …
1. A mixture is a combination of substances not chemically combined, e.g., sand - water, salad. A solution is a homogeneous mixture with solute dissolved in solvent, e.g., salt - …
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3 elements and compounds (continued) discuss elements and compounds by …
There are more than 90 naturally occurring elements. Seventy - five percent of the universe is hydrogen. The Earth's crust and the human body are made of different elements. But o…
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item 30: acid base titration curve analysis titration of 0.100 mol/l h₂…
1. a. The sample is $0.100\ mol/L\ H_{2}SO_{3(aq)}$. b. The titrant is $0.750\ mol/L\ NaOH_{(aq)}$. 2. a. Region A is a buffer region. b. Other buffer - like zones are regions wit…
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question 21 (1 point) how does alcohol affect the brain a developmental…
Question 21: c. All of the above Question 22: a. All of the above Question 23: a. Releases toxic chemicals, b. Increased stomach acid Question 24: b. 0.08%
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question 5 (1 point) use your anchor charts to answer, which is a short…
Question 5: c. increased nausea and vomiting Question 6: a. brain damage Question 7: a. Heart disease and high blood pressure
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concept 1 multiple choice (2 pts each) 1. all of the following pieces o…
1. C. petri dish 2. D. Graduated cylinder
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question 1 (15 points) match the correct vocab word with its definition…
1. 1 - h 2. 2 - c 3. 3 - o 4. 4 - n 5. 5 - b 6. 6 - l 7. 7 - e 8. 8 - m 9. 9 - a 10. 10 - j 11. 11 - f 12. 12 - g 13. 13 - i 14. 14 - k 15. 15 - d
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14.) explain the 2 steps to measure the ph level of a substance: * *you…
1. Prepare a pH - indicator or pH - meter. 2. Immerse the indicator or pH - meter electrode in the substance and determine the pH value.
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6.) during a chemical reaction, ______ are either formed or broken. * o…
6. D. bonds 7. False
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10.) when 2 hydrogen atoms bond with an oxygen atom, it produces water.…
Hydrogen atoms and oxygen atom
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10.) when 2 hydrogen atoms bond with an oxygen atom, it produces water.…
Hydrogen atoms and oxygen atom
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9.) what is the name of the new substance formed in a chemical reaction…
B. product
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4.) ________ is the amount of energy needed to start a chemical reactio…
B. Activation energy
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mrs. jacksons science class is learning about how baking soda and vineg…
$1\frac{2}{7}$ liters
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unit 2 assessment which bonds could a single carbon atom have? a. 2 tri…
C. a triple bond and a single bond
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unit 2 assessment the smallest particle of matter that can retain the c…
A. átomo
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unit 2 assessment atoms connected by covalent bonds share a. hydrogen i…
C. pares de electrones
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unit 2 assessment this model shows a fructose, a common sugar. which el…
C. Nitrógeno
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unit 2 assessment the images show carbon - based molecules found in liv…
# Breve explicación: El carbono tiene cuatro electrones de valencia y puede formar hasta cuatro enlaces químicos. Esto le permite crear enlaces con diferentes átomos, incluyendo o…
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unit 2 assessment which pair of molecules are both compounds? a. h₂, co…
# Explicación breve: Un compuesto químico es una sustancia formada por dos o más elementos químicos en proporciones fijas. En la opción C, CO₂ (dióxido de carbono) y H₂O (agua) so…
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unit 2 assessment the model shows water molecules interacting. the gray…
B. Los átomos de oxígeno en moléculas de agua se atraen a ambos átomos de oxígeno y átomos de hidrógeno.
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20) a coffee cup calorimeter has c_cal = 105.5 j °c⁻¹ and is initially …
C. $-64\ kJ\ mol^{-1}$
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in the context of abdominal pain, what condition should be considered w…
C. Irritable bowel syndrome
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question 33 which regulatory mechanism for hydrogen ion concentrations …
C. Renal mechanisms
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multiple choice 1 point what is the first reaction in the alarm respons…
The brain receives a danger signal.
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you can draw the structures of some common atoms by knowing their atomi…
For Helium: Nucleus with 2 protons and 2 neutrons, 2 electrons in first energy level. For Lithium: Nucleus with 3 protons and 4 neutrons, 2 electrons in first energy level, 1 elec…
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7. read this passage from the article: pets count on their human handle…
7. D. understanding and devoted 8. A. Being around animals can decrease stress and increase levels of feel - good chemicals in the body.
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self - esteem. and experts say thats probably because looking after ani…
B. Being around animals can increase levels of stress - reducing chemicals in the body like serotonin.
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what influences soil permeability? the ph and flavor of the soil the so…
C. soil texture, organic material, and pore space
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airborne chemical substances travel up the nose to the olfactory _, whi…
A. cilia
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13. use what you have just learned about chemical formulas to identify …
a. Element b. Compound c. Mixture d. Mixture e. Compound f. Element
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question 17 what is the formal charge on the central atom in the given …
0 A. Na < Si < N < O
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question 25 is this a valid lewis structure for clf₅? choose the best a…
Question 25: C. Yes, because Cl can have an expanded octet but F cannot. Question 26: (Assuming the option with Xe having 3 lone pairs and single bonds to F) The correct Lewis str…
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question 17 a student proposed the following lewis structure for ch2cl2…
0 O > N > P > Al
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choose the correct answer. what influences soil permeability? soil text…
soil texture, organic material, and pore space
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what is the wrong with this proposed lewis structure for of2? :f≡o—f: i…
I, III, IV The first option (with C single-bonded to 2 H and 2 Cl, each Cl having 3 lone pairs)
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question 10 identify the best lewis structure for no₂⁺. :o—n—o: ⁺ :o=n=…
B. [:O=N=O:]+
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select the correct answer. which of these elements is a halogen? a. pot…
E. bromine (Br)
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select the correct answer. in this redox reaction, identify the reducin…
B. Li
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select the correct answer. which statement best describes the propertie…
B. They may be gases, liquids, or solids at room temperature, and have a low melting and boiling point.
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select the correct answer. which equation obeys the law of conservation…
A. \(2C_4H_{10}+2Cl_2 + 12O_2 ightarrow7CO_2+CCl_4 + 10H_2O\)
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select the correct answer. which of these 2a elements has the largest a…
E. radium
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select the correct answer. what is the characteristic angle between ato…
B. 180°
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select the correct answer. which of these elements has two valence elec…
B. barium (Ba)
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select the correct answer. which acid has the formula hno₂? a. hydronit…
D. nitrous acid
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select the correct answer. hydrogen (h - 1), deuterium (h - 2), and tri…
D. a = 1, b = 1, c = 2