Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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a scientist is working with methane (ch₄) and butane (c₄h₁₀). which sta…
The correct statement is: "They are compounds made of the same two elements, but each contain different numbers of atoms." (Assuming this is the first option boxed as per the layo…
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which component is affected when a catalyst is added to a chemical reac…
the activation energy
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what must happen before a chemical reaction can begin? the activation e…
The activation energy must be reached. (The option with the text "The activation energy must be reached.")
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which statement correctly describes a chemical reaction? energy is alwa…
Bonds between atoms break and reform.
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how does a catalyst work? options: by decreasing the pressure of a chem…
by decreasing the activation energy of a reaction
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which statement best describes the amount of catalyst that remains at t…
The amount of catalyst is the same at the end as at the beginning of the reaction.
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if the activation energy required for a chemical reaction were reduced,…
The rate would increase.
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sulfur dioxide is a gas released when volcanoes erupt. it can react wit…
- O atoms: \(24\) - S atoms: \(8\) - \(SO_3\) molecules: \(8\)
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acetaldehyde is a substance commonly used in chemical factories. it is …
### Part 1: Completing the table (number of atoms) #### For Hydrogen (H): ## Step1: Calculate H from $C_2H_4$ Each $C_2H_4$ has 4 H atoms. There are 4 molecules of $C_2H_4$. So to…
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properties of atoms and compounds 1 can be solids, liquids or gases at …
2, 4, 6, 7
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in the atmosphere, nitric oxide forms when a lightning strike causes ni…
s: - Number of N atoms: \( 6 \) - Number of O atoms: \( 6 \) - Number of NO molecules: \( 6 \)
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ammonia is commonly used as a fertilizer for plants. it is made when ni…
s: - Number of H atoms: \( \boldsymbol{18} \) - Number of N atoms: \( \boldsymbol{6} \) - Number of \( \text{NH}_3 \) molecules: \( \boldsymbol{6} \)
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the number of protons in an atom is known as its atomic number. atoms t…
3 ### Second Sub - Question: Which of the following models also represents a lithium atom? (Note: Since the specific models' details are not fully visible in text, but based on th…
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below are two atomic models. each model represents a different atom. at…
electrons
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13. label the following statements describing: 1 ionic bonds 2 covalent…
2 1 1 2
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example 3-3 the haber reaction for the formation of ammonia releases en…
Approximately \( \boldsymbol{1.20 \times 10^3 \, \text{kJ}} \) (or \( 1199 \, \text{kJ} \)) of energy is released.
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an atom is an example of a system, or a group of objects that interact …
Top label: proton; Middle label: electron; Bottom label: neutron
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multiple choice 12. the octet rule states that when atoms form bonds, t…
D. the electron configuration of the nearest noble gas (assuming the options are labeled A, B, C, D in order as given: A. an equal number of protons and electrons, B. eight electr…
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protons and neutrons are found in the nucleus of an atom. traveling aro…
A. An electron has a negative electrical charge. B. A proton is much bigger and heavier than an electron.
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11. when a bond forms between lithium and chlorine □ 1 electron is tran…
1 electron is transferred from lithium to chlorine
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almost all of an atoms mass is found in its nucleus, located in the cen…
- can contain two types of particles: nucleus - is a particle present in all atoms: proton - has no electrical charge: neutron
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though they are too small to see without a special microscope, atoms ma…
A. Atoms are too small to see with the naked eye B. Atoms make up every substance around you
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10. what is the definition of electronegativity? □ bonding that occurs …
D. The relative tendency for an atom to attract electrons to itself when bonded
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an atom is an example of a system, or a group of objects that interact …
- Left - most label: atom - Label pointing to yellow (+) particles: proton - Label pointing to gray particles: neutron - Labels pointing to blue orbiting particles: electron
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9. metals tends to ____i____ electrons to become ____ii____ ions the st…
The row with "lose" in column i and "positive" in column ii (the last row in the table).
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protons and neutrons are found in the nucleus of an atom. traveling aro…
- An electron has a negative electrical charge. - All of an atom's electrons are located outside its nucleus.
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8. diatomic molecules (like o₂) are held together by □ polar covalent b…
D. non - polar covalent bonds
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multiple choice 7. how many valence electrons does carbon have? ☐ 12 ☐ …
C. 4 (assuming the options are labeled as A. 12, B. 8, C. 4, D. 6)
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6. atoms form bonds in order to □ have electrons transferred between th…
D. attain a full valence shell
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5. you would expect magnesium oxide to have a □ low melting point and c…
D. high melting point and conduct electricity when dissolved (assuming the options are labeled A, B, C, D in order as presented, with the last option being D)
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=4693655&p=65b01be6 use the following information to answer the next tw…
I
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carbohydrates are also known as saccharides. the word saccharide is a t…
$\boldsymbol{C_6H_{12}O_6}$
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30. name each piece of lab equipment below. discuss what the following …
- A: Beaker - Used for holding, mixing, heating liquids (approx. volume measurement). - B: Erlenmeyer Flask - Used for mixing, heating, storing liquids (reduces splashing). - C: T…
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use the atom builder interactive to answer the question. identify each …
To solve this, we use the definitions: - **Neutral atom**: Protons (\(p^+\)) = Electrons (\(e^-\)) - **Positive ion**: \(p^+ > e^-\) (lost electrons) - **Negative ion**: \(p^+ < e…
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which of the given is described by the octet rule? ○ elements randomly …
C. When some elements form chemical bonds, the elements share, donate, or accept electrons so that their valence electron shell contains eight electrons.
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30. name each piece of lab equipment below. discuss what the following …
a) Beaker - Used for holding, mixing, heating liquids (approximate volume measurement). b) Erlenmeyer Flask - Used for mixing, heating, storing liquids; titrations (narrow neck pr…
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the model shows the chemical structures of lactose and sucrose. lactose…
- Sucrose and lactose have different chemical structures. - The monosaccharides in sucrose are fructose and glucose. - The monosaccharides in lactose are galactose and glucose. - …
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which of the given substances can be classified as a compound? □ methan…
- methane ($\ce{CH4}$) - table salt (NaCl) - sucrose ($\ce{C_{12}H_{22}O_{11}}$)
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answer the following questions. 1. describe how the quantum theory of a…
- Bohr's theory: Electrons follow fixed, circular orbits (definite paths) around the nucleus, with discrete energy levels (electrons transition between levels by photon absorption…
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alternate test for module 2 match the definitions (a - j) to the terms …
c. electron ### Question 12
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multiple choice 2. potassium ion has the same electron configuration as…
B. argon (assuming the options are labeled with A: helium, B: argon, C: krypton, D: neon)
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1. which element would form non-polar, covalent bond with carbon? □ cal…
sulphur
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12. how many unpaired electrons are there in the following atoms? (cons…
3 (Orbital diagram for 2p: $\uparrow \; \uparrow \; \uparrow$ in three separate boxes representing the 2p orbitals) ### Part (b): Iodine Atom
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10. scientists at nasa are studying the potential for growing plants on…
The scientists can conclude that mass conservation holds in the system when no matter escapes. Initially, the mass of dry soil (100g) plus added water (20g) equals the mass immedi…
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maps stearic acid oleic acid complete the table. | | stearin | triolein…
| | stearin | triolein | | --- | --- | --- | | is a saturated fat | $\boldsymbol{\bigcirc}$ (checked) | | | is an unsaturated fat | | $\boldsymbol{\bigcirc}$ (checked) | | is like…
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the models show the chemical structures of stearic acid (a fatty acid) …
3
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11. what is wrong, if anything, with the following ground state electro…
To solve this, we analyze each electron configuration using the Pauli Exclusion Principle (no two electrons in the same orbital have the same spin) and Hund's Rule (electrons fill…
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select the true statements. steroids help regulate growth in the body. …
The true statements are: - Steroids help regulate growth in the body. - Steroids have carbon atoms arranged in rings. (Note: The statement "Steroids contain nitrogen atoms" is inc…
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orbital name | # of orbitals | max # of electrons s | | p | | d | | f |…
The completed table is as shown above with s: 1, 2; p: 3, 6; d: 5, 10; f: 7, 14.
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arrange the following steps in the correct order to describe how studen…
The correct order is A, B, C, D, E. ### For the second part (explaining mass conservation in the iron - sulfur experiment):
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b. the mass of aluminum used was 108 grams and the mass of aluminum oxi…
D. The mass of oxygen used was 18 grams and the total mass of the reactants equals mass of the product.
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which of the following forms of alcohol can be consumed? a. propanol b.…
D. ethanol
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a digital balance reading of 101 grams a small candle a large glass jar…
A. 108 grams ### Question 5
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name date secured (s2) lo: swbat observe cause-and-effect relationships…
B. The mass of water produced is equal to the mass of hydrogen and oxygen combined. ### Question 2
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use the drop-down menus to complete the passage. some forms of elements…
To solve this, we analyze each blank based on nuclear medicine and radioisotope concepts: ### First Blank: The sentence refers to using isotopic (radioactive) forms of elements. T…
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11. indique la formule chimique des ions formés. a. un atome de calcium…
\( \text{Ca}^{2+} \) ### b. Un atome de chlore gagne un électron
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5. which of the following reactions correctly represents the masses of …
A
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1 self - check activity for questions 1 - 11, complete each statement b…
1. Chemistry 2. inorganic, physical, analytical 3. central science, energy 4. natural phenomena, materials 5. discoveries 6. Measurement tools 7. observations, hypotheses, theorie…
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question 1 out of all the social media tools available today, the best …
C. Marketing and advertising tools because they can help you identify people who are interested and talking about your brand.
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which statement best describes the rhyme schemes of the author to her b…
Bradstreet uses couplets for their overall rhyme scheme and structure. Wheatley uses couplets to enhance the poem as a song of praise for creation.
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read the excerpt from the author to her book. \thou ill - formd offspri…
C. A.A.B.B
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the primary motivation behind basic research is to o develop new produc…
1. B. gain knowledge 2. D. lags behind basic research on the same substance
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determine what element is denoted by the following electron configurati…
Mg
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the study of the composition, structure, and properties of matter; the …
C. chemistry
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determine what element is denoted by the following electron - configura…
Ba
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two chemistry students are investigating the properties of quartz cryst…
B. inorganic chemistry
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the branch of chemistry that deals with substances containing carbon is…
C. organic chemistry
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which of the following is the correct noble gas notation(shorthand) for…
b) [Kr] \(5s^{2}4d^{10}5p^{2}\)
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chemistry is usually classified as a biological science. a physical sci…
B. a physical science
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a scientist is working on developing refrigerants that do not release c…
B. applied research
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using mathematical models and computer models to understand a chemical …
D. theoretical chemistry
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the branch of chemistry that involves the study of substances and proce…
B. biochemistry
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how many grams of co2 are there in 2.5 moles? 44.01 g 125.22 342.23 g 1…
110.03 g
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the definition of a chemical is a toxic substance made in a laboratory.…
any substance that has a definite composition
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all of the following are strong points of comparison. check any you inc…
All of the above can be included as strong points in a comparison paragraph.
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which of the following is the noble gas notation/shorthand for the elem…
c) [He]2s²2p²
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approximately how many atoms are in 12.6 grams of oxygen (o)? 2.37 x 10…
B. $4.74\times10^{23}$
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how many atoms are there in 1.2 moles of carbon? (a) 18.02 (b) 6.62 x 1…
$7.23\times 10^{23}$
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what do the superscripts represent in electron configurations? nothing.…
number of electrons
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solve the problem. 5) in a chemistry class, 7 liters of a 4% silver iod…
D. 3.5 L
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determine what element is denoted by the following electron configurati…
As
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3. describe the process of polymerization. (use the terms polymer and m…
Polymerization is the process by which monomers combine to form a polymer. Monomers are small molecules that act as building blocks, and through chemical reactions, they link toge…
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what is the molar mass of water? 18.02 g/mol 12.01 g/mol 33.02 g/mol 22…
18.02 g/mol
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which of the following electron configurations is correct for the eleme…
c) 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶
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1. what is organic chemistry?
Organic chemistry is the study of carbon - containing compounds, exploring their structure, properties, composition, reactions, and synthesis.
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periodic table how many valence electrons does the fluorine atom have? …
D. 7
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periodic table. the atomic number of an element is 15. what is the like…
C. There are 5 valence electrons and 10 core electrons.
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when organic matter becomes trapped underground, it may be transformed …
B. fossil fuels
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7. a water pitcher has 118 ml of water in it. the pitcher is being fill…
\(y = 139x+118\) ### 8.
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a compound is found to consist of 94.08% oxygen and 5.92% hydrogen. wha…
1 1
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4. compare and contrast each of the following terms: a. mass and matter…
a. Matter is what has mass and occupies space; mass is amount of matter. b. Atom is smallest element unit; compound has different atoms bonded. c. Physical property: observed with…
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12. what is the correct relationship between monomers and polymers? mon…
Monomers are subunits of polymers.
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you should frequently open and close the crucible when heating the magn…
False C. Class D Extinguisher E. Dry Sand
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in the poems, how does shakespeare allude to, or refer to, ovids poem? …
by personifying time as cruel and destructive
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a compound is found to have the empirical formula ch₂o and a molar mass…
For the first part: C: 6 H: 12 O: 6 For the second part: not enough oxygen
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passage poems great expectations, a novel written by charles dickens (1…
by copying the rhyme scheme and meter of the original poem
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a compound is found to consist of 94.08% oxygen and 5.92% hydrogen. wha…
For the empirical - formula problem: H 1, O 1 For the moles of nitrogen problem: 0.813
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which statement primarily appeals to logos to support the position that…
While it is true that electives may not be explicitly academic, in reality, electives can still help students develop valuable skills, such as critical thinking and creativity.
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which pair of compounds below would have the same empirical formula k₂c…
1. C. $\mathrm{C_2H_4}$ and $\mathrm{C_4H_8}$ 2. HO
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which of the following should you do when you perform this experiment? …
1. Check the crucible for any fractures or cracks 2. $NO_2$