Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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multiple-choice question which of the following are elements? select al…
A. (assuming A is an element), B. (assuming B is an element), C. (carbon, an element), D. (assuming D is an element) (Note: The exact answer depends on what A, B, D represent. If,…
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question 7 how many bonds (pairs of electrons) are in ch₂=ch₂? two bond…
D. Six bonds
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the repetition of similar sounds, typically at the end of lines in poet…
rhyme ### 2. Second Question
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calculate the amount of heat needed to boil 116. g of ethanol (ch₃ch₂oh…
To solve the problem of calculating the heat needed to boil ethanol, we need to consider three steps: heating the ethanol from \(-75.3^\circ \text{C}\) to its boiling point, vapor…
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how does free verse differ from other forms? a. it lacks rules of struc…
a. It lacks rules of structure, meter, and rhyme scheme ### Second Question: What is the main characteristic of free verse poetry?
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question 10 identify the formal charge for c in ch₃⁻. ○ −1 ○ 1 ○ 0 ○ 2
-1
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one method for estimating the enthalpy change for a reaction, δ h, is t…
-348
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the article states, ich in carbon, the solar-orbiting bennu is believed…
Carbon is an element.
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32 thermodynamics a chemical reaction absorbs 200 j of heat and causes …
-150 J
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what is the best definition of strategy? (1 point) ○ a plan for achievi…
A. a plan for achieving something
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11 matching 0.1 points what answer should be reported, with the correct…
# Explanation: ## Step1: Perform Multiplication First, calculate \( 471.23 \times 8.054 \). \( 471.23 \times 8.054 = 471.23\times(8 + 0.05 + 0.004)=471.23\times8+471.23\times0.05 …
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of, relating to, or derived from living matter. contains carbon escribi…
Orgánico
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(01.04 mc) matt has four samples of substances: sample a: 8 ml of hydro…
Sample B and Sample D
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(01.04 lc) what best defines an extensive property of a substance? a ph…
A. A physical property that depends on the sample size
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(01.03 mc) an object has a mass of 4.9 g and a volume of 14 ml. what is…
0.35 g/mL (corresponding to the option: 0.35 g/mL)
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which statement describes the properties of lanthanoids and actinoids? …
C. They are malleable and lustrous, and they tend to conduct both electricity and thermal energy (assuming the third option is labeled C, if the original options were labeled as A…
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in which group of elements does tellurium (te) belong? (1 point) alkali…
metalloids (the option with text "metalloids")
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based on patterns in the periodic table, which element is the least mal…
phosphorus (P)
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how does mercury differ from other metals? (1 point) it is not lustrous…
It is not solid under normal conditions.
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an element is highly conductive, highly reactive, soft, and lustrous. t…
alkali metals
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27. (03.07 hc) \for many americans, these four months have brought sorr…
Orientation—President George W. Bush included the story of a person who lost a loved one during the attacks.
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to the correct number of significant figures? 25.64 - 19.202 a) 6.438 b…
c) 6.44
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question 5 (1 point) which of the following is the correct answer for t…
c) 6.44
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question 3 (1 point) how many significant figures are in the number 301…
e) 6
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analysis and conclusion questions: 1. which water level heated up the f…
The 100 mL water level heated up the fastest. We know this by looking at the graph: the line representing 100 mL has the steepest slope (shows the most rapid increase in temperatu…
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question 8 a mixture of two or more substances that are uniformly mixed…
A. Solution
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what is made up of solutes and solvents? ○ suspension ○ solutions ○ col…
B. Solutions (assuming the options are labeled as A. Suspension, B. Solutions, C. Colloid) ### Second Question (You can make a solution more concentrated by adding what?)
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what is the concentration of a solution? the amount of solvent needed t…
The amount of solute that has been dissolved in a given amount of solvent ### Second Question (Which is an example of a solute?)
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5. if corey produces 7.3 grams of sodium carbonate in a reaction that r…
To solve this problem, we need to know the balanced chemical equation for the reaction involving sodium carbonate and sodium phosphate. Assuming the reaction is between calcium ph…
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what is the substance called that dissolves the other substance in a so…
C. Solvent ### Second Question (In a saltwater solution, what substance is considered the solvent?)
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question 1 what is the substance called that is being dissolved in a so…
D. Solute
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read: concept vocabulary identify the choice that best answers the ques…
C. No one shows up for Joshua's thirteenth birthday party.
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check all the ways listed below that ensure accurate reading of volume …
- using subtraction to determine the volume dispensed - making sure that you read the volume with the liquid inside the pipette at eye level - ensuring that air bubbles are not in…
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this energy diagram shows the allowed energy levels of an electron in a…
A ### 2. How many excited states are there?
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3. an object has a mass of 35.0 grams. on maxs balance, it weighs 34.85…
The percent error of Max's balance is approximately \( 0.43\% \) (or more precisely \( 0.4286\% \)).
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2. if the percent yield of a reaction was 65.0% and its theoretical yie…
The actual yield is $0.424\ \text{g}$ (or $0.4238\ \text{g}$ depending on precision)
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the diagram shows the logarithm of the first 13 ionisation energies of …
B. The element is aluminium.
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19. the chemical equation for formation of table salt is shown. 2na + c…
The total number of atoms in the sodium chloride molecules is equal to the total number of atoms in the sodium and chlorine gas molecules.
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1a. shane tested the properties of four samples and recorded data in th…
Sample 1
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the table shows the different physical properties an element can posses…
insulator, brittle
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the table shows the different physical properties an element can posses…
insulator
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16. matter can undergo physical or chemical changes. which of these are…
Freezing a popsicle, Breaking an egg
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16. matter can undergo physical or chemical changes. which of these are…
The examples of physical changes are: - Breaking an egg (checkbox should be selected) - Freezing a popsicle (checkbox is already selected)
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question 2 2.1 define the term molar mass. (2) 2.2 calculate the percen…
Molar mass is the mass of one mole of a substance (in g/mol), numerically equal to its relative atomic/molecular mass (sum of atomic masses of constituent atoms) in amu, scaled to…
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which of these are examples of physical changes? options: burning paper…
Freezing a popsicle
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15. the particle diagram below represents four molecules of a substance…
The particle diagram with four molecules, each consisting of one black and one white particle (same as the original in terms of molecular composition, just possibly different spac…
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a new element has been discovered that is a semiconductor, brittle as a…
In columns 13 - 16, because it is a metalloid
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the result of two liquids forming a solid is called options: a precipit…
a precipitate
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4. what is the density for a powder that weighs 40.0 g and when added t…
\( \approx2.67\space g/mL \) ### Problem 5 (already has a solution, verifying)
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question 1 (1 point) fatty acids are hydrophobic (water fearing) molecu…
True ### Question 2
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which of the following demonstrate evidence of a chemical change? selec…
- Substance sinking: Chemical Change Has Not Occurred - Precipitate forming: Chemical Change Occurred - Change in shape: Chemical Change Has Not Occurred - Production of gas: Chem…
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11. which of the following is examples of a chemical change? options: w…
Rust forming on a car door
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fatty acids are hydrophobic (water fearing) molecules; because they are…
A. True ### Question 2
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a pharmacy technician has just finished preparing a chemotherapy medica…
A. Hazardous medications (H)
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10. calcium nitrate ca(no₃)₂ is often used in fertilizers. which elemen…
Elements: Calcium (Ca), Nitrogen (N), Oxygen (O) (3 elements in total). Number of atoms: - Calcium (Ca): 1 atom - Nitrogen (N): 2 atoms - Oxygen (O): 6 atoms
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question 9. directions: drag and drop the correct answer choice to each…
First blank: color Second blank: was
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name: navel seg date: september learner / securing lo: swbat compare th…
- Primera línea (después de "A"): solution - Segunda línea (después de "which"): a solute - Tercera línea (después de "is"): dissolved (En los dibujos: salt (solute) + water (solv…
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8. when baking soda (sodium bicarbonate, nahco₃) reacts with vinegar (a…
60 g
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put the following numbers in order of increasing amount of sig figs (i.…
1. \(9.6\times10^{3}\) 2. \(7.57\times10^{6}\) 3. \(0.6363\) 4. \(737290\) 5. \(7.6136\times10^{5}\) 6. \(0.04321400\)
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students are testing the reactivity of different solutions by mixing th…
- Trials 3 and 4 formed a new substance because both trials resulted in a precipitate. - (Another correct one, if exists, but based on the table and options, the above is one, and…
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7. students are testing the reactivity of different solutions by mixing…
The correct option (from the visible choices) is: *Trials 3 and 4 formed a new substance because both trials resulted in a precipitate* (the yellow-highlighted option). If a secon…
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students are testing the reactivity of different solutions by mixing th…
To solve this, we analyze each option against the data table: ### Analyzing Option 1: "Trial 1 and 4 formed a new substance because both trials resulted in a change in shape." - T…
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an element has the following properties: - very highly reactive - shiny…
A. Location A
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the chemical equation for photosynthesis is: 6co₂ + 6h₂o → c₆h₁₂o₆ + 6o…
The number and type of atoms on both sides are the same, showing that atoms are rearranged, not created or destroyed.
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how many significant figures are in the measurement 1.050 l? a. 1 b. 2 …
d. 4
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20. —- a measuring cup that is accurate but not precise. 21. a student …
To solve the problem of finding the volume of a rock sample with a density of \(0.78 \, \text{g/cm}^3\) and a mass of \(24.8 \, \text{g}\), we use the formula for density: \[ ho =…
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ammonia, nh₃, is a common chemical compound used in cleaning products a…
The correct statement is "Three molecules of ammonia would contain 3 atoms of nitrogen and 9 atoms of hydrogen" (the last option among the given choices).
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2. what is the volume of water occupied by 100.0 g of water? remember t…
The volume of water is $100.0\space cm^3$ (or $100.0\space mL$ since $1\space cm^3 = 1\space mL$).
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the chemical formula for a molecule of acetaminophen is displayed below…
There are 20 total atoms involved in the chemical formula for a molecule of acetaminophen.
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2 which of the following lists all the elements that are present in a m…
The elements present in a molecule of calcium phosphate \( \text{Ca}_3(\text{PO}_4)_2 \) are Calcium, Phosphorus, and Oxygen. So we check the boxes for Calcium, Phosphorus, and Ox…
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abby added baking soda and vinegar to a flask. she stretched a balloon …
The mass should be the same since matter is conserved in a chemical reaction (the gas produced is trapped in the balloon, so total mass of the system remains unchanged). (The opti…
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element name | isotopic symbol | atomic number | mass number | # of pro…
To solve the missing values in the table, we use the following relationships: - Atomic Number = Number of Protons = Number of Electrons (in a neutral atom). - Mass Number = Number…
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value: 3 a ___ reaction is a process that occurs when two or more molec…
a. chemical
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name _______________ class _______________ date _______________ reinfor…
If the red chemical is in a liquid layer at the bottom (or a lower layer) of the tank, open the tap at the bottom of the tank to drain the liquid layer that contains the red chemi…
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value: 3 ____ reactions are processes in which one or more nuclides are…
b. Nuclear
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match the terms to their definition. 1. distress 2. endorphins 3. envir…
1. distress - Bad stress that creates sadness and anxiety 2. endorphins - chemicals released by the body that relieve mild depression and provide you with a feeling of peace and h…
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reinforcement continued class date 4. use colored pencils to sketch and…
If the red chemical is in a lower - density layer, we can carefully pour off the upper layers. If it is in a higher - density (lower) layer, we can open the tap at the bottom of t…
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value: 3 stable atoms have ____ energy states. ○ a. higher ○ b. lower #…
b. lower
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name semina dack date 9/10/25 scientific method read & write handout te…
Laura accidentally got black permanent marker on her new, white shirt. ### Question 2
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which of the following best describes anabolic steroids? ○ anabolic ste…
Anabolic steroids are hormone - like substances that are synthetic.
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a matter of density imagine that you work at a chemical plant. this mor…
s: ### 1. Densities: - Green liquid: $\boldsymbol{0.75}$ kg/L - Blue liquid: $\boldsymbol{0.9}$ kg/L - Red liquid: $\boldsymbol{1.2}$ kg/L - Black liquid: $\boldsymbol{0.8}$ kg/L …
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two iron rods are placed horizontally, touching end-to-end. one end of …
D. The molecular movement in the first rod transferred energy to the molecules in the second.
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match the terms to their definition. 1. club drugs 2. drug abuse 3. inh…
1. club drugs - ecstasy (MDMA), Gamma - hydroxybutyrate (GHB), Rohypnol (roofies), Ketamine (K) 2. drug abuse - Compulsive use or overuse of drugs 3. inhalants - any one of about …
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which of the following medications requires special disposal because it…
A. A partially used vial of chemotherapy medication
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a cold cast iron skillet is placed onto a stove top. when the stove is …
C. The skillet is gaining energy (heat) from the stove.
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a student conducts an experiment to test how the temperature affects th…
B. the temperature of the water
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vocabulary for each pair of vocabulary words, write one sentence that d…
The four characteristics of a state are: 1. Population (people living within it); 2. Territory (defined geographic area with boundaries); 3. Sovereignty (supreme authority within …
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tai chi is a good example of an activity that improves: a. energy level…
d. Balance ### Second Question:
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question 1 (4 points) saved which one of the following sets of quantum …
\(n = 4, l = 2, m_l=-1, m_s = - 1/2\) (the third option: \(n = 4, l = 2, m_l=-1, m_s=-1/2\))
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practice table - valence electrons & atoms vs. ions fill in the chart b…
To solve the table, we use the following concepts: - Atomic number ($Z$) = number of protons ($p^+$) = number of electrons ($e^-$) in a neutral atom. - For ions: Charge = $p^+ - e…
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practice table - valence electrons & atoms vs. ions fill in the chart b…
To solve the table, we use the following concepts: - Atomic number (\(Z\)) = number of protons (\(p^+\)) = number of electrons (\(e^-\)) in a neutral atom. - Charge = \(p^+ - e^-\…
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value: 3 when water turns into ice, its molecules ____. ○ a. expand ○ b…
a. expand
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value: 3 if 100g of ice is melted, 100g of water are formed. this 100g …
c. conservation of mass
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fill in the name and empirical formula of each ionic compound that coul…
### For $\boldsymbol{\ce{Zn^{2+}}}$ and $\boldsymbol{\ce{OH^-}}$: ## Step1: Balance charges The cation is $\ce{Zn^{2+}}$ (charge +2) and the anion is $\ce{OH^-}$ (charge -1). To b…
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exercise impacts mental health by improving levels of which two neurotr…
b. Dopamine and serotonin ### Second Question:
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quiz 6.2.1 - energy forms value: 16 match the description to the energy…
1. Elastic energy - e 2. Thermal energy - a 3. Gravitational energy - d 4. Nuclear energy - b 5. Electrical energy - c
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question 2 (1 point) saved what is obscured 2.00)/(1.2465 + 3.45) writt…
e) 62.8
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multiple-choice question the image below tells us that fluorine should …
7. The option corresponding to 7 (the checkbox next to 7) should be selected.
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the image below tells us that magnesium should be in group ____. (remem…
2 (the option with "2")
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which of the following is the number of grams of dextrose in 500 ml of …
50 g (corresponding to the option with 50 g)