化学
化学反応、化学量論、分子構造、元素の性質。
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if the chemical reaction ab + cd → ad + bc releases heat, what is true …
The first question: The bond energy of the reactants is higher than the bond energy of the products. The second question: Products, Reactants
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a substance has a ph value of 12.5. this value means the substance is: …
C. A base
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which of the following shows the correct sequence of energy flow, as th…
Chemical potential energy → Thermal energy → Electrical energy → Sound energy
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a substance has a ph value of 1. this value means the substance is: neu…
D. An acid
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a molecule that will accept protons in a solution is defined as: an ion…
B. A Bronsted - Lowry base
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in the previous combustion experiment, the technician determined that t…
It is an open system because matter (gaseous products) is lost during the reaction and energy (heat) is transferred to the surroundings as the outside of the chamber is hot.
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which of the following best describes a base according to the bronsted …
B. A base will accept protons.
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use the data in the table to answer the following questions. how many g…
91.5 g
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the total mass of the products must ______ the total mass of the reacta…
A. equal
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a molecule that will provide protons in a solution is defined as: an io…
A Bronsted - Lowry acid
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determine which type of change each statement represents. physical chan…
grind coffee beans: physical change aluminum combining with oxygen to form aluminum oxide: chemical change crushing an aluminum can: physical change recycling used aluminum cans t…
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which of the following best describes an acid according to the bronsted…
An acid will donate protons.
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a transition of matter from one state to another physical change phase …
B. phase change
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change in a substance that does not alter its composition physical chan…
physical change
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process of forming anions how are anions formed from elements? these el…
These elements gain negatively charged electrons.
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a chemical change occurs whenever new substances form. substances are m…
new substances form.
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process of forming cations which of the following best describes how ca…
These elements lose negatively charged electrons.
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from a laboratory process designed to separate water into hydrogen and …
$89.4\ g$
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if 22.99 g of sodium and 35.45 g of chlorine fully react, how much sodi…
58.44 g
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identifying cations which of the following ions would be considered a c…
An element with 5 protons, 2 electrons, and 5 neutrons
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7. the most common mineral group 8. described as either metallic or non…
11. Inorganic 12. Irregular fracture 13. Streak 14. Cleavage 15. Tetrahedron 16. Oxide
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this state of matter has molecules that are close together, they vibrat…
1. A. Solid 2. B. The pressure
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which of the following is not a potential sign of chemical change? chan…
B. boiling
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part b based on what you know about matter, explain why the food colori…
The rate of food - coloring mixing varies due to temperature and the properties of the solvent. Temperature affects particle kinetic energy and diffusion rate, while the nature of…
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forming anions which of the following is most likely to form an anion? …
Group 7a halogens
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classify each example as a physical change or a chemical change. physic…
Crushing an aluminum can: Physical change Recycling used aluminum cans to make new aluminum cans: Physical change Aluminum combining with oxygen to form aluminum oxide: Chemical c…
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businesses like 3m and pharmaceutical companies are examples of * 1 poi…
1. Applied Chemistry 2. Anything that has mass and takes up space 3. It started as a combination of philosophy, religion, and science called Alchemy
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identify the anion in the following molecule: (nh3)3p p h nh3 n
A. P
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your car burns gasoline as you drive up a mountain road. what energy tr…
B. Chemical to kinetic
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which of the following is considered an anion? na+ f- f na
F⁻
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this state of matter has an indefinite shape and a definite volume * 1 …
1. B. Liquid 2. Neither (but if forced to choose, more like basic knowledge rather than applied chemistry) 3. C. A long explanation of how things work that has been tested again a…
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periodic trends worksheet using the periodic table and your knowledge o…
1. a. Bi; b. Se; c. O; d. Po; e. F; f. Cs 2. Metals 3. The distance from the nucleus of an atom to the outermost shell of electrons 4. Across a period, atomic size decreases; down…
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question 1. a change is a change in a substance that does not involve a…
Physical; melting ice (answers may vary for the example, other common ones like boiling water, breaking glass also work)
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identifying anions which of the following ions would be considered an a…
An element with 5 protons, 7 electrons, and 5 neutrons
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these can be observed without changing the substance. they include thin…
1. Physical Properties 2. Chemical Properties 3. A summary or equation that has been repeated endlessly with experimentation
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which of the following is most likely to form a cation? alkaline earth …
Alkaline earth metals
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physical chemistry studies what specifically? * 1 point polymers carbon…
1. D. Physics Principles to explain chemical reactions 2. B. Molecular structures made up of similar units bonded together
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determine the product of the equation below* n₂ + h₂ → nh₃
$NH_3$
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identify the cation in the following molecule: mgso4 mg so4 s o
Mg
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epsom salt (mgso₄·7h₂o) is commonly used in baths to reduce pain and mu…
A. $[\text{Mg}]^{2 + }$
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which of the following is considered a cation? n n3- ca2+ ca
$Ca^{2+}$
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question 3 10 pts true or false? when the temperature of a gas in a 8 -…
False ### Question 4
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a car engine uses the combustion of fuel to move a system of gears that…
B. It is transformed into sound energy. E. It is transformed into thermal energy.
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9. used to compare the hardness of minerals 10. a measure of density fo…
9. Mohs scale 10. Specific gravity 11. Inorganic 12. Fracture 13. Streak 14. Cleavage 15. Tetrahedron 16. Oxide
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6. valuable mineral prized for its rarity and beauty 7. the most common…
6. J 7. (No correct option provided in a strict sense based on common knowledge of silicates being the most common group) 8. P 9. Q 10. N 11. P
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part d like all metals, copper is malleable. this property is related t…
No, a straw is not a good model for showing the malleability of copper because the reasons for their bendability are different. Copper's malleability is due to metallic bonding, w…
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a writer is writing the content for the company website of a backpack m…
1. Contact 2. History 3. Products 4. History
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which of the following is the correct bohr model for a neutral nitrogen…
A. Option with 2 electrons in the first shell and 5 electrons in the second shell (assuming option A is the correct one based on the above - described electron configuration).
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match the following scams to the correct type of identity theft schemes…
II. Skimming, I. Phishing, III. Spyware
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determine the product of the equation below * n₂ + h₂ → nh₃ □ n2 □ h2 □…
NH3 ### 2. Second question
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final unit in dimensional analysis what are the final units in the foll…
mL
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the following bohr model represents a neutral atom of element x. which …
B. $\ddot{X}$
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identify whether each property is intensive or extensive * 7 points int…
Freezing Point: Intensive Mass: Extensive Density: Intensive Area: Extensive Length: Extensive Concentration: Intensive Odor: Intensive
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question 3 10 pts true or false? when the temperature of a gas in a 8 -…
False ### Question 4
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analytical chemistry studies what specifically? * isolating and underst…
1. Isolating and understanding chemical composition and its uses 2. The products are $CO_2$ and $2H_2O$
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the picture shows an example of a ______ * homogenous mixture heterogen…
Heterogenous Mixture
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build a model of copper. place your materials on a sheet of paper. conn…
Difficulties could include accurately representing the atomic structure, getting correct proportions, and model stability.
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periodic table worksheet choose answers from this list. terms may be us…
1. groups 2. periods 3. atoms 4. nucleus; protons; neutrons 5. Protons 6. Neutrons 7. atoms; protons; electrons 8. atomic number 9. mass number 10. protons; atomic number 11. isot…
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determine the reactants of the following reaction * combustion chemical…
CH4, O2
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two species with the same electron configuration are said to be isoelec…
D. $As^{3-}$ E. $Kr$ F. $Rb^{+}$
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post lab questions. 1. what is the purpose of crystallization in an org…
The purpose of crystallization in an organic chemistry procedure is to purify solid organic compounds.
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this easily compressible state of matter has very little interaction am…
1. C. Gas 2. Yes
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the picture shows an example of a ____. 1 point heterogenous mixture ho…
Heterogenous Mixture
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research that is directed towards a goal/application and using research…
1. B. Applied Chemistry 2. C. Life processes (like DNA and Respiration)
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record 27pokrja@perham.k12.mn.us as the email to be included with my re…
1. B. Dipole - dipole forces 2. A. Hydrogen bonds
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reactions worksheet when two (ionic) chemicals react, they split into t…
1. NaCl + H₂O 2. Al₂O₃ + 2Fe 3. Mg(NO₃)₂ + 2H₂O 4. Fe₂(SO₄)₃ + 6H₂O 5. CaF₂ + H₂ 6. 2LiCl 7. 2H₂O 8. 2NaOH + H₂ 9. No reaction 10. 2AgCl↓ + Ba(NO₃)₂ 11. 2NH₃
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1. using the table, what are 3 minerals you have used in the past week …
1. Calcite in toothpaste, halite as salt in food, quartz in computer. 2. Organic substances violate the inorganic criterion for minerals. 3. Quartz used in making glass, halite us…
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instructions: complete the questions below using the provided table com…
1. Mineral Name: Calcite, How you used it: In toothpaste Mineral Name: Halite, How you used it: As salt in food Mineral Name: Quartz, How you used it: In computer 2. a. Water: Min…
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2. solid in which the atoms are arranged in repeating patterns
Crystal
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1. naturally occurring, inorganic solid with specific chemical composit…
Mineral
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#4 chemistry a schoology 2025 12. what is the difference between a nucl…
A nucleon is a proton or neutron in the nucleus. A nuclide is a specific type of atom defined by its number of protons and neutrons.
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3. the table above does not show all of the uses for the minerals liste…
3. Quartz - used in making glass; Mica - used in electrical insulators 4. The arrangement of atoms greatly affects the physical properties and uses of a substance.
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#4 chemistry a schoology 2025 11. write the symbol and charge for each …
| Particle | Symbol | Charge | |--|--|--| | Alpha | $\alpha$ or $_{2}^{4}\text{He}$ | $+2$ | | Beta Plus | $\beta^{+}$ or $_{+1}^{0}e$ | $+1$ | | Beta Minus | $\beta^{-}$ or $_{-1…
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a local reaction is when a chemical enters the bloodstream. true false
False
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a picture of a ______ is the label pictogram on a chemical that warns o…
Skull and crossbones
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the term route of entry on an sds refers to the way a ______ enters the…
D. Chemical
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#4 chemistry a schoology 2025 10. what is the difference between the el…
The electrostatic force acts between charged particles and can be attractive or repulsive depending on the charges. It is an electromagnetic - type force. The strong nuclear force…
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title: mineral activity instructions: complete the questions below usin…
1. | Mineral Name | How you used it | |--|--| | Calcite | In toothpaste | | Halite | As salt in food | | Quartz | In a computer | 2. a. Water is a liquid, minerals are solid. b. P…
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#4 chemistry a schoology 2025 order the types of decay from least dange…
Gamma decay, Beta decay, Alpha decay
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4. select the answer from the menu. the natural isotope abundance of co…
63.6
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elements in a periodic table are arranged from left to right and top to…
increasing atomic number
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periodic table worksheet choose answers from this list: terms may be us…
1. groups 2. periods 3. atoms 4. nucleus; protons; neutrons 5. protons 6. neutrons 7. atoms; protons; electrons 8. atomic number 9. mass number 10. protons; atomic number 11. isot…
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#4 chemistry a schoology 2025 1. 20 protons and 24 neutrons 2. 40 proto…
1. Stable 2. Unstable 3. Stable 4. Unstable 5. Unstable
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label the shorthand for carbon - 14.
Top box: 14 Bottom - left box: 6 Bottom - right box: C
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3 multiple choice 1 point which of the following terms represents the s…
3. A. Atom 4. C. If the goldfish receives caffeine then the breathing rate of the goldfish will increase.
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color coding the periodic table student worksheet part 2: answer the qu…
1. Groups (or Families) 2. Periods 3. Metals 4. Metalloids 5. Non - metals 6. Alkali metals 7. Alkaline earth metals 8. Transition metals 9. Halogens 10. Noble gases
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match the term to the definition. the protons and neutrons in the middl…
A specific number of protons and neutrons that make a unique nucleus - Nuclide A subatomic particle that can be either a proton or neutron - Nucleon When different atoms of an ele…
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all elements with an atomic number above 82 will have unstable nuclei. …
Particles or high - energy waves; Lead; more stable nuclei
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question 20 (5 points) listen why is open pit mining so devastating to …
C. It completely removes any available topsoil.
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question 19 (5 points) listen how does the hydroelectric dam pictured h…
B. By blocking fish migration
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all elements with an atomic number above will have unstable nuclei. thi…
82; Lead; alpha particles, beta particles, gamma rays; more
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question 16 (5 points) listen how does the principle of faunal successi…
Question 16: C. Fossils appear in the strata in a specific order based on age. Question 17: B. Methane levels decreased and oxygen levels increased, promoting aerobic life forms.
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1. for the following structure: a) identify the parent chain. how many …
a) The parent chain has 10 carbons. b) Decane c) 3 - methyl, 6 - methyl
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what is a concentration? amounts of solute in the solvent a uniform mix…
Amounts of solute in the solvent
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15) what happens to gases when the temperature is increased? 16) what h…
1. The average kinetic energy of gas molecules increases, and they move faster and collide more frequently and with greater force against the container walls. 2. The volume of the…
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what is a solution? doing the dissolving what is getting dissol m mixtu…
A solution is a homogeneous mixture of two or more substances.
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10) postulate 1: gases are very small ____ and their size is insignific…
10. particles 11. speeds 12. collide 13. elastic 14. absolute
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1) the kinetic molecular theory is used to explain each of the experime…
1. True 2. Gas molecule 3. A. empty spaces 4. True 5. C. energy remains the same
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part a how many o2 molecules are needed to react with 3.32 g of s? expr…
$6.23\times 10^{22}$ molecules
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what is the fdas definition of its atural\ food label? minimally proces…
minimally processed and free of artificial ingredients, preservatives, and other unnaturally occurring chemicals