化学
化学反应、化学计量、分子结构与元素性质。
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what is formed when two or more different colored legos are combined? e…
Mixture
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what is represented when you combine 2 or more legos of the same color?…
Element
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what is represented when two or more legos are put together? atom mixtu…
C. Molecule
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multiple - choice question what does one individual lego represent? mix…
B. Atom
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multiple - choice question a pure substance can be an element only comp…
Could be both
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multiple - choice question which of the following are compounds? alumin…
salt, \(NaCl\) Carbon Dioxide, \(CO_2\)
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16. which of the following is an alkaline earth metal? a. potassium b. …
16. B. Barium 17. D. Noble Gases 18. A. Dmitri Mendeleev 19. C. Both 1A and 2A 20. D. are less reactive
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multiple - choice question elements are made up of one type of atom mol…
atom
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multiple - choice question both homogenous and heterogenous are pure su…
mixtures
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multiple - choice question which of the following would be a heterogene…
salad
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what type of mixture is the composition the same throughout? heterogene…
homogeneous
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multiple - choice question what type of mixture is the composition not …
heterogeneous
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10. which of these elements has atoms with the largest atomic radius? a…
10. B. Cs 11. B. \(I ightarrow Br ightarrow Cl ightarrow F\) 12. B. Period 2 14. B. 4 15. A. Beryllium
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5. which trends are observed as each of the elements within group 15 on…
5. D. Their metallic properties increase, and their atomic radii increase. 6. B. fluorine. 7. B. The chlorine atom gains an electron, radius becomes larger. 8. D. magnesium 9. B. …
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excerpt from \is it a crime for a u.s. citizen to vote?\ by susan b. an…
It emphasizes that all people, including women, are equal citizens of the United States.
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excerpt from \is it a crime for a u.s. citizen to vote?\ by susan b. an…
It was we, the people, not we, the white male citizens, nor yet we, the male citizens; but we, the whole people, who formed this Union.
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10. which factor has the least effect on cleaning? a brand of sanitizin…
10. A. brand of sanitizing solution 11. B. rinse 12. D. concentration, temperature, contact time, water hardness, and pH level 13. D. keeping eggs in their shells and refrigerated…
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excerpt from \is it a crime for a u.s. citizen to vote?\ by susan b. an…
People already had rights before governments were formed.
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5. sneezing or coughing while preparing cuisine will: a clear ones sinu…
5. C. contaminate the food. 6. B. National Standards Foundation (NSF) 7. D. poultry 8. C. pesticides 9. B. shellfish and salads
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excerpt from \is it a crime for a u.s. citizen to vote?\ by susan b. an…
She argues that the U.S. Constitution does not give the right to vote to certain people, but that it protects it for everyone.
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read the passage. the next step: composting composting is a process tha…
Part A: 2. "As recycling has become the norm for American households, widespread composting is the next logical step." Part B: 2. (Paragraph 2)
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question 5 read these passages from the article. which one is an opinio…
A. Who knew homework could be so much fun?
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select the correct answer. eastman kodak was very famous in the history…
C. It introduced C - 41, a color film developing process.
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is this reaction balanced? explain. hcl + naoh → nacl + h₂o
Yes, the reaction is balanced. Because the number of atoms of each element (\(H\), \(Cl\), \(Na\), \(O\)) is the same on both the reactant (\(HCl + NaOH\)) and product (\(NaCl + H…
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which of the following is not a factor that has contributed to agricult…
D. the prohibition of hybridized crops
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question 25 (1 point) which statement best describes electrons? ¿qué en…
C. They are negative subatomic particles and are found in the nucleus.
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19. list three physical properties of non - metals. 20. scroll down to …
19. Dull appearance, poor heat conductors, poor electrical conductors. 20. Silicon. 21. Semiconductor property. 22. Because it burns with a distinctive color.
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question 24 (1 point) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 is the electron con…
B. Potassium
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question 23 (1 point) what is the number of electrons in an al+3 ion? o…
C. 10
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which electron-dot symbol correctly represents an atom of its given ele…
A. Option a (Boron - B)
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read the passage. from geology of mesa verde national park the park is …
2. Water helped form the landscape by soaking into the rocks and sealing up cracks.
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question 10 (1 point) which of the following is not part of daltons ato…
B. Atoms of the same element can be different.
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question 9 (1 point) which atom in the ground state has a stable electr…
A. argon
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which electron configuration represents the electrons in an atom of ga …
C. \(1s^22s^22p^63s^23p^64s^23d^{10}4p^1\)
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question 7 (1 point) question 7 of 25 | page 7 of 25 the elements in gr…
C. number of valence electrons
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q.9. which of the following is a heterogeneous mixture? a) air b) steel…
- Q.9: C. Soil - Q.10: B. Vinegar - Q.11: D. solutions - Q.12: A. mixture
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q.5. which of the following statements is false? a) matter is anything …
d) All pure substances are elements. # Q.6
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the element sulfur is classified as a - a metal b non - metal c metalli…
B. non - metal
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question 5 (1 point) which general trends in ionization energy and elec…
a. The ionization energy decreases and the electronegativity decreases.
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question 4 (1 point) how many neutrons are on potassium - 40? ¿cuántos …
C. 21
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how many valence electrons does chlorine have? o a 35 o b 7 o c 17 o d 3
b 7
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q.3. which of the following is not an element? a) oxygen b) gold c) cop…
- Q3: d) Table salt - Q4: b)
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which products would form if chlorine gas was bubbled through a solutio…
# Explicación breve: La reacción entre cloro (\(Cl_2\)) y bromuro de sodio (\(NaBr\)) es una reacción de desplazamiento. El cloro es más electronegativo que el bromo, lo que signi…
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what is the word equation for atoms of magnesium reacting with molecule…
magnesium + oxygen → magnesium oxide
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a reaction occurs when one compound reacts and is broken down into diff…
B. decomposition
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which characteristic best identifies a decomposition reaction? a single…
a single compound as a reactant
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which statement best characterizes chemical reactions? their rates vary…
Their rates vary significantly.
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underground limestone caverns can be formed over long periods of time a…
chemical weathering
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pure substances and mixtures (worksheet) q.1. use the words in the box …
Q1: - Pure Substances: Element, Compound - Mixtures: Homogeneous, Heterogeneous Q2: a) Element b) Compound c) Heterogeneous mixture d) Homogeneous mixture
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consider the unbalanced equation for the oxidation of butene. $c_4h_8 +…
four carbon dioxide molecules and four water molecules
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25 - 26 physical science 1 chemical reactions this formula equation is …
2
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which statement describes a chemical reaction? reactants form products …
Reactants form products when atoms are rearranged.
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the equation shows lead reacting with sulfuric acid to produce lead sul…
single replacement
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consider the chemical equation for the combustion of sugar. _c₆h₁₂o₆(s)…
1, 6, 6, 6
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which reaction will most likely take place based on the activity series…
\(Li + ZnCO_{3}\to\)
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a chemical reaction has two elements as reactants. which type of reacti…
synthesis
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which type of reaction is represented by the generic equation ab + cd →…
double replacement
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which products are formed when aluminum is added to a silver chloride s…
\(AlCl_{3}\) and \(Ag\)
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considering the activity series given for nonmetals, what is the result…
no reaction
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an unbalanced chemical equation for the reaction of boron fluoride with…
6
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the chemical equation for the formation of ammonia is unbalanced. 3h₂(g…
2
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which statement describes a chemical reaction? atoms in the products ar…
Atoms in the reactants are rearranged to form new substances.
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which symbol can be used to indicate a chemical reaction that takes pla…
$\xrightarrow{Pt}$
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which is the most important question for deciding if a chemical reactio…
Was any heat energy given off?
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when two substances are mixed together, a color change is observed. doe…
No because some physical changes produce color changes.
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which chemical equation is unbalanced? 6h₂ + 3o₂ → 6h₂o sr + o₂ → 2sro …
La ecuación \(Sr + O_{2}\to2SrO\) está desbalanceada.
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which of these scenarios is most likely a chemical reaction? a liquid b…
Dos colorless liquids are added together, and a colorless liquid and a green solid remain.
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which statement about the two images is true? image a: a roasting marsh…
Image A shows a chemical reaction, and image B shows a physical change.
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chemical reactions the images show two unrelated events occurring at se…
Event 1 because there is a release of heat and light.
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the table below shows some behaviors of water that might be observed in…
2. Supporting the weight of a water insect in a pond.
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what is the element? phosphorus silicon sulfur chlorine
Phosphorus
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which is the electron configuration for beryllium? 1s²2s¹ 1s²2s² 1s²2s²…
\(1s^{2}2s^{2}\)
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no two electrons in the same atom can have the same four quantum number…
Pauli exclusion principle
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all orbitals of equal energy are occupied by one electron before any si…
Hund's rule
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for years, biologists have experimented with using grime - eating bacte…
A. Additionally,
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the structure of water allows it to dissolve many minerals allowing it …
C.
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the chemical trimethylamine n - oxide not only gives fish their fishy s…
B. As a result,
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draw the lewis structure of the following molecule. use it to give the …
Number of single bonds: 13 Number of double bonds: 0 Number of sigma bonds: 13 Number of pi bonds: 0 Number of unshared electrons: 0
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draw the lewis structure of the following molecule. use it to give the …
Number of single bonds: 0 Number of double bonds: 2 Number of sigma bonds: 2 Number of pi bonds: 2 Number of unshared electrons: 8
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draw the lewis structure of the following molecule. use it to give the …
Number of single bonds: 2 Number of double bonds: 1 Number of sigma bonds: 3 Number of pi bonds: 1 Number of unshared electrons: 4
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draw the lewis structure of the following molecule. use it to give the …
Number of single bonds: \(2\) Number of triple bonds: \(1\) Number of sigma bonds: \(3\) Number of pi bonds: \(2\) Number of unshared electrons: \(12\)
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draw the lewis structure of the following molecule. use it to give the …
Number of single bonds: \(6\) Number of double bonds: \(0\) Number of sigma bonds: \(6\) Number of pi bonds: \(0\) Number of unshared electrons: \(24\)
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mark all that are true about covalent bonds atoms share 6 electrons in …
- Atoms share 6 electrons in a triple bond - Triple bonds are stronger than double bonds - Triple bonds contain one sigma bond and two pi bonds
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fe + s → fes reading check integrate with visuals explain how the masse…
In the chemical reaction \(Fe + S ightarrow FeS\), the sum of the masses of \(Fe\) (\(14.0g\)) and \(S\) (\(8.0g\)) is \(14.0 + 8.0=22.0g\), which equals the mass of \(FeS\) (\(22…
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mass conserved figure 4 iron and sulfur react to form iron sulfide. the…
\(173.3\,\text{g}\)
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the ideal gas law, shown below, is used in chemistry, where p is pressu…
\( P=\frac{nRT}{V} \) (the third option)
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that are chemically rearranged in the reaction are the equation. readin…
Reactants: Methane (\(CH_4\)), Oxygen (\(O_2\)); Products: Carbon dioxide (\(CO_2\)), Water (\(H_2O\))
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i. directions: in the space provided, write the letter of the choice th…
1. c. hemophilia 2. d. all of the above 3. b. Hodgkin’s disease 4. a. anemia
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which statements describe processes involved in the accretion of planet…
B. Both involve the formation of solid particles from nebular materials, D. Both involve the trapping of gases and the clumping of masses of matter, E. Both involve the growing of…
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formation of ammonia figure 2 the diagram of the molecules and the chem…
1. Circle \(2NH_3\); underline \(1\) (for \(N_2\)), \(3\) (for \(3H_2\)), and \(2\) (for \(2NH_3\)). 2. \(3\) 3. No, atoms are neither created nor destroyed. There are \(2\) nitro…
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what charge do noble gasses elements form? 1 point +1 +2 +3 ±4 -3 -2 -1…
\(0\)
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what charge do group 16 elements form? 1 point +1 +2 +3 ±4 -3 -2 -1 0 w…
-2
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connect it! the rust on this ship formed from a chemical reaction betwe…
Iron source: The ship's metal (iron - containing materials). Oxygen source: The air (atmospheric oxygen).
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classify each of the following as a combination, decomposition, single …
Combustion reaction.
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in a lab experiment, students had four samples of elements. they made o…
A. Black pellet
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select the correct statement(s) about ionization energy. it decreases a…
- It decreases as you move down a group. - Ionization energy from highest to lowest is helium (\(He\)), krypton (\(Kr\)), magnesium (\(Mg\)), and potassium (\(K\)). - It increases…
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a student stirred sugar into a beaker of warm water until the sugar cry…
B. Sugar is soluble in water, meaning it dissolves.
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elements for this property. 4. analyze the tuva data set. select the co…
- It decreases as you move down a group. - It increases as you move across a period. - Electronegativity from highest to lowest is fluorine (F), oxygen (O), chlorine (Cl) and osmi…
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which statement best compares the solubility of these substances at 40°…
D. Substance D has the greatest solubility.
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1. c(s) + o₂(g) → co₂(g) what type of reaction is #1? decomposition com…
combustion