Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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select the statement(s) that best describe what happens during physical…
- Chemical weathering is the breakdown of rock by chemical processes. - Chemical weathering is when the rocks or minerals react chemically with air or water to form new substances…
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question 7 of 10 which description is an example of direct characteriza…
B. Steve was the strongest wrestler on the team, yet he was several inches shorter than his opponents.
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question 11 1 pts when a base is added to water, the ph should ______. …
B. increase ### Question 12
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question 13 1 pts which of the following statements is true? acids and …
A. Acids and bases will neutralize each other.
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10 multiple choice 1 point where are the lowest energy electrons locate…
Innermost shell
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9 multiple choice 1 point electrons travel around the nucleus of the at…
C. shells or orbitals
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question 4 (1 point) 0.00028 g = ________ mg blank 1: |
\(0.28\)
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question 2 (1 point) 39 g = ____ mg blank 1: | next page back
\(39000\)
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which of the following are considered subatomic particles? neutrons ele…
- neutrons (checked) - electrons (checked) - protons (checked) - Ions (un - checked)
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question 1 (1 point) 15.8 g = ______ dg
158
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what do atoms make up? ○ periodic table ○ only solid matter ○ chemical …
D. everything (assuming the last option is labeled D; if the options are labeled A - D as A. periodic table, B. only solid matter, C. chemical reactions, D. everything, then the a…
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which of the following best describes a chemical reaction? a) atoms rea…
A) Atoms rearrange to form new substances
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which part of an atom carries a positive charge? electron proton neutro…
B. Proton
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which of the following is true about ionic bonds? ○ they are the weakes…
B. Electrons are transferred from one atom to another
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what is an atom? ○ a mixture of elements ○ the smallest unit of an elem…
B. The smallest unit of an element that retains its properties
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which of the following is a molecule? ○ oxygen gas (o₂) ○ neon (ne) ○ i…
A. Oxygen gas ($O_2$)
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which of the following is not a functional group that can bond with car…
All of these functional groups can bind with carbon.
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in a chemical reaction, which aspect of the reactants changes? (1 point…
A. arrangement of the atoms
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4. 100.0 g of 4.0°c water is heated until its temperature is 37°c. calc…
The heat energy needed is approximately \( 1.4 \times 10^4 \, \text{J} \) (or 13794 J, or 13.8 kJ).
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matter conservations matters quick check which change is chemical? (1 p…
B. water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules (assuming the options are labeled A, B, C, D with this as one of them; if original labels dif…
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in the following diagram, what does the number 12 represent? diagram: 6…
An atomic mass
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although all are true, what is the best conclusion from the fact that e…
B. Atoms are comprised mostly of empty space.
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how are molecules different from atoms? they consist of several atoms b…
A. They consist of several atoms bonded together.
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the word \atom\ comes from a greek word for \indivisible.\ in what way …
B. They cannot be broken apart without losing their chemical properties.
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which of the following is not a functional group that can bond with car…
All of these functional groups can bind with carbon.
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complete the activity to practice what you have learned. which statemen…
The number of carbon atoms in the reactants and products are equal.
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question 13 1 pts which of the following statements is true? ○ acids an…
A. Acids and bases will neutralize each other. ### Question 14
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question 11 1 pts when a base is added to water, the ph should ______. …
B. increase ### Question 12
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oxygen has an atomic number of 8. what can you conclude from this fact?…
D. An atom of oxygen has 8 protons.
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question 7 1 pts atoms that vary in the number of neutrons found in the…
B. Isotopes
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what do electrons in the same shell have in common? they have the same …
A. They have the same amount of energy.
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what is the significance of the periodic table of elements? choose the …
B. It predicts and lists all the chemical elements in the universe. (Here we assume the second option is labeled as B, if the original options have different labels, adjust accord…
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question 11 an example of a compound is ○ salt (nacl) ○ sodium (na) ○ c…
A. Salt (NaCl)
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choose all of the following that are compounds. water (h2o) carbon diox…
- water ($H_2O$) - carbon dioxide ($CO_2$) - Hydrochloric acid (HCl)
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______ are substances with constant composition that are made of elemen…
C. Compounds
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water’s chemical formula is \h₂o.\ what does this mean? ○ water is comp…
A water molecule contains two hydrogen atoms and one oxygen atom.
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a compound is ○ a pure substance that cannot be broken down into simple…
B. a pure substance made of two or more types of atoms that are chemically bonded together.
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what is a compound? a compound is a substance made up of two or more el…
A. a compound is a substance made up of two or more elements
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some iron and sulfur are mixed together, then heated. when the result i…
A. compound
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question 5 what is vanillin (c₈h₈o₃) ? (this is what smells like vanill…
A. Compound
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what happens to the chemical formula and structure of water when it cha…
D. Nothing happens to the chemical formula and structure.
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in what way are liquids different from solids? liquid molecules are lig…
C. Liquids don't have a fixed shape; solids do.
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what is hydrogen peroxide (h₂o₂) ? compound element homogeneous mixture…
A. Compound
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1 multiple choice 1 point what is matter? choose the best answer anythi…
B. Anything that takes up space
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check all of the following that are mixtures ☐ air ☐ distilled water (h…
- Air - Ocean water (H2O, NaCl, KCl, etc) - Tree leaves
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determine the electron configuration of: 1) o²⁻ e⁻= 10 p⁺= 8 n⁰= 10-8= …
$e^- = 10$, $p^+ = 8$, $n^0 = 8$, Electron Configuration: $1s^2 2s^2 2p^6$ ### 1. For $\boldsymbol{N}$ (Nitrogen):
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question 1 which of the following is a compound? phosphorus trichloride…
A. Phosphorus trichloride (PCl) (Note: Correct formula should be PCl₃, but among the given options, this is the compound as it consists of different elements chemically combined)
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question 6 1 pts if xenon has an atomic number of 54 and a mass number …
### Question 6 # Explanation: ## Step1: Recall neutron formula The number of neutrons ($n$) is calculated by the formula $n = \text{mass number} - \text{atomic number}$. ## Step2:…
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a silver necklace reacts with sulfur in the air which make... (partiall…
\(2\text{Ag}\) and \(\text{S}\) ### For "Which chemical formula(s) represents the products?"
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take quiz exit question 4 1 pts true or false: molecules with the formu…
False ### Question 5
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3. mg e⁻ = ____ p⁺ = ____ n⁰ = ______ electron configuration: no. of sh…
\( e^- = 12 \), \( p^+ = 12 \), \( n^0 = 12 \) Electron Configuration: \( 1s^2 2s^2 2p^6 3s^2 \) No. of Shells = 3, Valence \( e^- = 2 \) ### For 4. \( \text{Mg}^{2+} \):
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consider the figure below: atomic number 6 c 12 chemical symbol 6 c 13 …
carbon - 12: 6 neutrons; carbon - 13: 7 neutrons
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consider the figure below: figure showing electron shell diagrams for e…
1 (corresponding to the option "1" or the option with the text "1" among the choices, which in the given options is the one marked with the blue dot: "1")
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how many electrons do elements in groups 14 and 17 need to gain to achi…
Elements in group 14 need to gain 4 electrons and elements in group 17 need to gain 1 electron.
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name _________________________________________ polymer lab step 3- hypo…
An inference is a conclusion made from observations/evidence. A hypothesis is a testable prediction (often in an “if - then” format) made before an experiment to be tested.
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3. what is the value of n in the equation 2.6 × 10⁻² = (5.2 × 10⁷) ÷ (2…
\(n = 9\) ### Question 4
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step 3- hypothesis and variables think back to the original day of poly…
Inference: Conclusion from evidence/observations. Hypothesis: Testable prediction for an experiment. ### Hypothesis Completion (Example)
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1. identify the element. 2. identify this element. 3. identify the elem…
Zirconium (Zr) ### Problem 3:
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links. www.scilinks.org topic: origin of elements code: hk81082 section…
Mendeleev organized his periodic table by arranging elements in order of increasing atomic mass and grouping elements with similar chemical properties in vertical columns (groups)…
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this energy in the form of light. what happens to the electrons as the …
1. Electrons exist in discrete energy levels (orbitals) with specific energy values around the nucleus. 2. The nucleus is composed of protons (positive charge) and neutrons (neutr…
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no balanced chemical equation a silver necklace reacts with sulfur in t…
\(2\text{Ag}\) (Silver) and \(\text{S}\) (Sulfur) ### 2. Which chemical formula(s) represents the products?
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c:1 h:2 o:3 is this a balanced equation (yes or no)? explain why
No. A balanced chemical equation requires the number of each type of atom (C, H, O here) to be equal on both the reactant and product sides. The given data shows atom counts for o…
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4. calculate the atomic mass of lead. the four lead isotopes have atomi…
The atomic mass of lead is approximately 207.22 amu (rounded to two decimal places).
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multiple select question select all that apply which of the following a…
A. acesulfame - K, B. neotame, D. aspartame
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energy → c₆h₁₂o₆ + o₂ which chemical formula(s) represents the products…
\(C_6H_{12}O_6\) and \(O_2\) ### Second Sub - Question: How many of each atom is present in the products?
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what do these two changes have in common? dry ice sublimating and becom…
Both are only physical changes. Both conserve mass. (Note: "Both are caused by heating" is incorrect for pouring milk on oatmeal (it’s a physical mixing, not necessarily caused by…
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what do these two changes have in common? a log decomposing in the wood…
Both conserve mass. Both are chemical changes. (Note: The options "Both are caused by cooling" and "Both are changes of state" are incorrect. Log decomposition (rotting) and snail…
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what do these two changes have in common? an engine using gasoline to p…
Both conserve mass, Both are chemical changes. (Note: The options "Both are caused by heating" and "Both are caused by cooling" are incorrect. The engine using gasoline involves c…
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what do these two changes have in common? a dinosaur bone turning into …
The correct option is: Both are chemical changes.
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what do these two changes have in common? adding dish soap to water in …
A. Both are only physical changes.
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directions: read chapter 15 section 2- click here from the red earth sc…
To solve this fill - in - the - blank problem about Earth's energy and heat transfer, we analyze each blank based on the context and the word bank: ### Blank 1: The sun is the pri…
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what do these two changes have in common? a copper statue turning green…
B. Both are chemical changes
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what do these two changes have in common? dew appearing on grass in the…
A. Both are only physical changes
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what do these two changes have in common? stapling an envelope shut san…
A. Both are only physical changes.
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select and drag each item to the correct area. diethylene glycol, tar, …
Vape Juice Ingredients: Diethylene glycol, Ammonia, Diacetyl Cigarette Ingredients: Tar (Note: Tin seems out of place here, maybe a mistake in the question. If we have to place it…
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4. calculate the atomic mass of silicon. the three silicon isotopes hav…
The atomic mass of silicon is approximately \( 28.09 \) amu (more precise calculation: \( 27.9769\times0.922297 + 28.9765\times0.046832 + 29.9738\times0.030872 = 27.9769\times0.92…
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what do these two changes have in common? a puddle freezing into ice on…
A. Both are only physical changes.
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5 plant cells use water, carbon dioxide and en and oxygen this process …
$CO_2$, $H_2O$ ### Sub - question 2: How many of each atom is present in the reactants?
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diacetyl is... ○ ...an ingredient in vape juice that is not good to inh…
C. ...an ingredient that is considered safe in some foods to eat, but is not safe to inhale into the lungs.
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write the systematic name of each organic molecule: structure cl—c(cl)=…
1,1 - dichloro - 4 - methylpent - 2 - ene
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p⁺= e⁻= n⁰= 2. determine the number of protons, neutrons, and electrons…
For \(\boldsymbol{_1^1 H}\): \(p^+ = 1\), \(e^- = 1\), \(n^0 = 0\) For \(\boldsymbol{_1^2 H}\) (Deuterium): \(p^+ = 1\), \(e^- = 1\), \(n^0 = 1\) For \(\boldsymbol{_1^3 H}\) (Trit…
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name _______________________________ set 8th warm up 1. determine the n…
\( p^+ = 9 \), \( e^- = 9 \), \( n^0 = 10 \) ### Part b: \( \text{F}^- \) (Fluoride ion)
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uncertainty in measurement quiz cp chemistry a 0 / module 1: chemistry …
C. There are 30 students in the class, D. There are 100 cm in 1 m
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molecules are attracted to one another by van der waals forces. how do …
B. Van der Waals forces are weaker than ionic and covalent bonds.
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3. which of the following correctly shows the measurement 9.603 s round…
B. 9.60 s (assuming the options are labeled as A: 9.6 s, B: 9.60 s, C: 9.6030 s, D: 9.603 s)
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how does a molecular compound compare to the elements that make up the …
D. The properties of a compound are usually very different from the properties of the elements that make it up.
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2. what is the result of the following calculation? record to the corre…
7.535 mL
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the atomic number of carbon is six, which means that a carbon atom has …
B. All carbon atoms have six protons and six electrons. D. Atoms of some naturally occurring carbon isotopes may have six neutrons.
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deuterium is an isotope of hydrogen. it has a mass number of two. which…
A. a nucleus of one proton and one neutron, which is orbited by one electron
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write the systematic name of each organic molecule: | structure | name …
To solve the problem of naming the organic molecules, we follow the IUPAC nomenclature rules for alkenes with halogen substituents. Here are the systematic names for each structur…
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when electrons transfer from one atom to another, both atoms become cho…
First "Choose" (for the type of species after electron transfer): ions Second "Choose" (for the bond type with electron transfer): ionic Third "Choose" (for the bond type with ele…
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complete the table about subatomic particles. terms can be used more th…
To complete the table about subatomic particles, we use the properties of electrons, protons, and neutrons: ### First Row (Particle with negative charge): - **Particle**: electron…
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q1 chemistry: u1l7 unit 1 review teacher: ____________ date: __________…
c. A mixture can be separated by physical means. ### Question 4
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1. **carbon dioxide has a formula of co₂. use this knowledge to represe…
### Problem 1 (Carbon Dioxide Phase Changes) #### Explanation: To represent the phase changes of \( \text{CO}_2 \) (solid → liquid → gas) and create a key: 1. **Solid Phase (Dry I…
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if the known mass of an object is 2.5 grams, which of the following mea…
2.49 g
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read the descriptions of rhyme schemes below free verse: poetry that do…
A. free verse
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read the following passage: the problem began simply enough. in the 195…
A. By tracing the contamination problem over time
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2/11 which data set is most precise? 150 g 75 g 1.75 g 2.49 g 4.50 g 3.…
The dataset with values 1.75 g, 1.72 g, 1.79 g (the orange - colored option) is the most precise as it has the smallest spread (difference between maximum and minimum values) amon…
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read the following passage: the problem began simply enough. in the 195…
A. Government slowdowns can lead to environmental disasters.
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you have a mixture of hydrogen gas (h₂) and oxygen gas (o₂). the mixtur…
The partial pressure of oxygen gas is \( \boldsymbol{830 \, \text{mmHg}} \).