Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
-
3. what is the relationship between solvents and solutes? solutes disso…
Solvents dissolve solutes.
-
why is the atomic mass of an element not given as a whole number on the…
D. because atomic mass is the average relative atomic mass of all isotopes of the element
-
what is the average mass of carbon, if there is 97% c - 12, 2% c - 13, …
B. \((0.97)(12)+(0.02)(13)+(0.01)(14)=12.04\)
-
what is the average atomic mass of lithium, if it is 90% li - 7, 5% li …
C. (0.9)(7)+(0.05)(6)+(0.05)(5)=6.85
-
2. how does the structure of the water molecule lead to its ability to …
It is a polar compound
-
26 if an element has 3 common isotopes and the abundance of two of the …
C. 30%
-
25 what are isotopes? a very rare elements b atoms of elements that are…
C. Atoms of elements that have different numbers of neutrons
-
24 for what reason is atomic mass in a decimal form on the periodic tab…
C. It is the average relative atomic mass of all isotopes of the element
-
what two parts of the atom have an atomic mass of approximately 1 amu (…
B. protons and neutrons
-
1. what are some fundamental properties of water? choose all that apply…
It expands when it transitions to a solid. It is a universal solvent. It has the ability to corrode rocks. It can hold a large amount of heat.
-
complete the sentence with the best correlative conjunctions. on earth,…
not only... but also
-
below is the complete decay chain of uranium - 238. you need to work ou…
$_{90}^{234}Th ightarrow_{91}^{234}Pa + _{-1}^0e+\gamma$; $_{91}^{234}Pa ightarrow_{92}^{234}U+_{-1}^0e + \gamma$; $_{92}^{234}U ightarrow_{90}^{230}Th+_{2}^4He+\gamma$; $_{90}^{2…
-
atomic orbitals (see 117) 7. is the following sentence true or false? a…
7. True 8. more 9. 2 10. b. two 11. True 12. a. The electrons are in the most stable configuration.; c. The atom is in its ground state.
-
section 4.2 the structure of an atom (pages 108 - 112) this section com…
No specific question was asked in the provided text. However, if one were to fill the table: - What I Know About Atoms: Atoms are building blocks of matter, may contain subatomic …
-
bonus: after 4 half - lives, a sample of polonium - 218 has a mass of 1…
192 grams
-
section 4.3 modern atomic theory (pages 113 - 118) this section focuses…
Ground state; Returns to ground state
-
match the phrase with the subatomic particle being described. drag & dr…
What is the positively - charged particle of an atom? - Proton(s) What is the neutrally - charged particle of an atom? - Neutron(s) What is the negatively - charged particle of an…
-
what subatomic particle always determines the identity of an atom? a pr…
A. Protons
-
17 what sub - atomic particles are found in the nucleus of an atom? (se…
D. Protons, E. Neutrons
-
14 how many neutrons is in a tellurium atom? (this is a mathematic prob…
C. 76
-
13 how many electrons are on the outer most shell of boron? a 2 b 8 c 3
C. 3
-
of the x atoms in a certain molecule, 44% are carbon. which expression …
B. $0.44x$
-
part i - explore the atom open the build an atom simulation - click on …
1. The proton goes to the nucleus. 2. The neutron goes to the nucleus. 3. The electron goes to the orbits. 4. Protons and neutrons. 5. Electrons. 6. Hydrogen. 7. The element chang…
-
part ii - building atoms of elements build the following atoms of eleme…
| Directions | Subatomic Particles | What Element | Diagram (description) | |---|---|---|---| | Add 5 protons, Add 6 neutrons, Add 5 electrons | $p = 5$, $n=6$, $e = 5$ | Boron (B…
-
construct the expression for kp for the following reaction. n₂(g) + o₂(…
Numerator: $(P_{NO})^2$ Denominator: $P_{N_2}\times P_{O_2}$
-
problem 3 of 28 a (blue) ⇌ b (red) the equilibrium constant (k) for thi…
C
-
atomic structure practice complete the following table. *remember that …
| Symbol Notation | Atomic Number | Number of Protons | Mass Number | Number of Neutrons | Number of Electrons | |---|---|---|---|---|---| | $^{122}_{51}Sb$ | 51 | 51 | 122 | 71 |…
-
write the ions first then write the chemical formula 1) mg+1, o-2 → mg1…
1. \(MgO\) (Note: Magnesium forms \(Mg^{2 + }\) not \(Mg^{+1}\), so the correct formula is \(MgO\)) 2. \(LiBr\) 3. \(Ca_{3}N_{2}\) 4. \(Al_{2}S_{3}\) 5. \(KI\) 6. \(SrCl_{2}\) 7. …
-
which of the following statements are always true for a reaction at equ…
A. I and II
-
which of the following is true for a reaction at equilibrium? problem 1…
C. The rate of the forward reaction is equal to the rate of the reverse reaction.
-
which is a property of covalent compounds? a high boiling point b form …
B. form when atoms share electrons
-
6. draw the lewis structure diagrams for the following molecular compou…
1. $2\mathrm{H_2O}\to2\mathrm{H_2}+\mathrm{O_2}$, Decomposition 2. $2\mathrm{KI}+\mathrm{Pb(NO_3)_2}\to\mathrm{PbI_2}+2\mathrm{KNO_3}$, Double - displacement 3. $3\mathrm{H_2}+\ma…
-
chapter 4 atomic structure atomic number and mass number (page 110) 5. …
5. False 6. atomic 7. False 8. mass 9. Number of protons 10. protons, electrons 11. neutrons 12. Isotopes 13. b. 10 14. False
-
the arrangement of subatomic particles and the bohr model of the atom a…
Element A is carbon. The symbol of this element is C. It has an atomic number of 6 which tells me that there are 6 protons. In this neutral atom the number of protons = the number…
-
#16 formula sheet calculator periodic table heating curve of water temp…
A. the heat of fusion
-
which of the following best describes the difference between solids, li…
Solids have a definite shape and volume, liquids have a definite volume but no definite shape, and gases have neither a definite shape nor volume.
-
what would be the balanced formula for a compound made from beryllium a…
A. $BeCl_{2}$
-
which model correctly shows a stable ionic compound of magnesium chlori…
B.
-
10physicalscience_interim 1_25-26 #13 formula sheet calculator periodic…
B. The substance melts or boils because it is undergoing an endothermic phase change.
-
oxygen, $^{16}_{8}o$ $1s^{2}2s^{2}2p^{4}$ what would happen to this oxy…
C. It would transform into the atom carbon - 12 with an electrical charge of 2.
-
chapter 4 atomic structure thomsons model of the atom (pages 102 - 103)…
5. repel; attract 6. negative 7. a. An atom is filled with positive matter.; c. Negative charges are scattered throughout an atom. 8. alpha particle 9. a. More alpha particles wer…
-
section ii: balancing chemical equations balance the following chemical…
1. $2,3,4,3$ 2. $1,9,6,6$ 3. $2,6,2,3$ 4. $1,2,1,1$ 5. $3,2,3,1$ 6. $4,2,2,5$ 7. $1,1,1,1$ 8. $1,1,1,1$ 9. $3,2,1,6$ 10. $4,5,2$ 11. $1,4,3,4$ 12. $1,1,2,1$ 13. $1,12,12,11$ 14. $…
-
section 4.1 studying atoms (pages 100 - 105) this section discusses the…
1. atoms 2. True 3. atoms; divided 4. a. All elements are composed of atoms. b. In a particular compound, atoms of different elements always combine the same way.
-
density worksheet chemistry a instructions: answer the following questi…
1. The density of the brown sugar is $1.5375$ g/mL 2. The density of the cooking oil is approximately $0.8236$ g/mL 3. The density of the cork is approximately $0.253$ g/mL
-
2. what are all of the required components of a flow - diagram? 3. will…
# Explanation: ## Step1: Identify compound type for $NaClO_3$ $NaClO_3$ is an ionic compound. Sodium ($Na^+$) is a metal and chlorate ($ClO_3^-$) is a poly - atomic ion. The name …
-
phase change diagram navigate to question at position 2, unanswered the…
- From B -> C, the temperature does not change - As time advances, the particles are moving faster and faster from A -> B - This phase change diagram is not for water - The diagra…
-
learning goal: to understand several methods of measuring gas pressure.…
$1.19$ (rounded to two decimal places)
-
complete the sentence. an ____________ is a ____________ that _________…
An enzyme is a protein that speeds up the rate of a chemical reaction by lowering the activation energy needed for the reaction to proceed.
-
solar - powered cars use energy from the sun to work. a panel on the ca…
radiant, electrical, mechanical
-
first read: concept vocabulary identify the choice that best answers th…
D. How do two presidential candidates differ in their goals for the country?
-
solar - powered cars use energy from the sun to work. a panel on the ca…
radiant, electrical, mechanical
-
wood has chemical energy, which can be used to generate thermal and rad…
The total energy in the system remains the same as the decrease in chemical energy equals the increase in thermal and radiant energy.
-
4. observation and analysis (15 minutes) have students record their obs…
5. Chemical composition, pH, solubility etc. contribute to effectiveness. 6. From initial assumptions to knowledge of chemical reactions and mechanisms. 7. Observation, data analy…
-
the human body stores chemical energy from digested food. some of the c…
Digested food is a source of potential energy.
-
what are the two main types of energy? kinetic and potential thermal an…
kinetic and potential
-
savion listed the steps involved when nuclear power plants generate ele…
Reorder the steps so that step 6 appears before step 5.
-
which change is an example of transforming potential energy to kinetic …
None of the provided options are examples of transforming potential energy to kinetic energy.
-
a light energy, chemical energy b water, oxygen c electromagnetic energ…
A. light energy, chemical energy
-
reduction is the ______ of an electron; oxidation is the ______ of an e…
C. gain, loss
-
isotopes - problems given the information below, calculate the average …
$55.84$
-
archaeologists dont discover historical artifacts made from plant - bas…
A. The geology of the cave
-
the synthesis of novel superheavy elements, such as nihonium (nh), has …
C. It provides details about the qualification later in the sentence regarding the prospect of cataloging the full range of possible chemical compounds.
-
part b when carbon is burned in air, it reacts with oxygen to form carb…
96.8 g
-
40 multiple choice 1 point what is the first reaction in the alarm resp…
The brain receives a danger signal.
-
2. you are an astronaut on a malfunctioning rocket! you accidentally ej…
i. Thermosphere; Threat: Lack of oxygen and extreme cold. ii. Ionosphere; Threat: High - energy radiation. iii. Mesosphere; Threat: Extremely low temperatures and lack of oxygen. …
-
2. you are an astronaut on a malfunctioning rocket! you accidentally ej…
Thermosphere
-
7 0/1 point select the appropriate choice that describes the molecule s…
polar
-
select the appropriate choice that describes the molecule shown below. …
polar
-
2 0/1 point select the appropriate choice that describes the molecule s…
We need the actual options with descriptions to provide a specific answer. As it stands, we know the current selection of "nonpolar" is incorrect according to the red cross, but w…
-
how does therapy help in the treatment of depression? a changes negativ…
A. changes negative thinking patterns
-
chapter 12 test: matter, properties and changes total questions: 24 wor…
1. c) chemical property 2. b) ability to be crushed 3. b) density 4. d) mass and volume 5. a) soluble in water 6. b) ability to react with oxygen 7. c) flammability
-
what two states are pictured in this image? a) gas and solid b) volume …
a) gas and solid
-
16. match the substance with the state of matter ice cubes a) liquid c)…
16. b) solid 17. a) solid 18. a) gas 19. b) liquid 20. b) burning 21. b) burning paper 22. a) frying a hamburger 23. c) light
-
8. the rusting of iron is not a physical property because a) iron is ma…
8. c) a new substance with new properties formed 9. a) gas 10. a) displacement 11. b) the wall was blue 12. c) orange juice being made from fresh oranges 13. a) plant making food …
-
8. which state of matter has a very weak attractive force between parti…
8. a. gas 10. a. displacement 11. b. the wall was blue 12. b. leaves changing colors in the fall, c. orange juice being made from fresh oranges 13. a. plant making food out of wat…
-
chapter 12 test: matter, properties and changes total questions: 24 wor…
1. c) chemical property 2. b) ability to be crushed 3. b) density 4. d) mass and volume 5. a) soluble in water 6. b) ability to react with oxygen 7. c) flammability
-
multiple - choice question c₆h₁₂o₆ is the chemical formula for all of t…
A. Starch
-
which of these is most closely related to traditional agriculture and n…
the use of human or animal muscle power
-
how should chemical pesticides be used in integrated pest management? a…
C. sparingly, with the aim of controlling pests
-
1. multiple choice which of the following elements is in the same group…
B. Potassium (K) # 2.
-
practice: 1. identify the correct family. 2. explain the reasoning base…
| Element Description | Family? | Why? | | ---- | ---- | ---- | | Barium (Ba) - a reactive metal used in medical imaging and fireworks | Alkaline - earth metals | Has 2 valence el…
-
practice: 1 identify the correct family 2 explain the reasoning based o…
1. B. Potassium (K) 2. They have the same number of valence electrons. 3. C. They have the same number of valence electrons 4. Chlorine and iodine are both in Group 17 (halogens) …
-
valence electrons directions: determine how many valence electrons each…
Si: 4 Be: 2 B: 3 F: 7 Na: 1 P: 5 Mg: 2 He: 2 N: 5 Cl: 7 Al: 3 Li: 1 Ge: 4 Ca: 2 Rb: 1 Se: 6
-
directions: label the diagram below and place the charge next to each i…
1. Beryllium (Be) 2. 4 3. Group 2 4. Period 2 5. Yes, alkaline - earth metal
-
name: exit ticket sc.8.p.8.5 which compound is formed when magnesium (m…
1. A. MgO 2. C. $CaCl_{2}$ 3. A. R1
-
decide whether each chemical reaction in the table below is an oxidatio…
For $CO(g)+H_2O(g)\to CO_2(g)+H_2(g)$: redox reaction? yes reducing agent: $CO$ oxidizing agent: $H_2O$ For $Fe(s)+CuSO_4(aq)\to FeSO_4(aq)+Cu(s)$: redox reaction? yes reducing ag…
-
classify each chemical reaction: reaction type of reaction (check all t…
1. double replacement, acid - base 2. decomposition 3. double replacement, acid - base 4. combustion
-
set solvent water (polar) oil (non - polar) interact with molecules mov…
The hydrophilic heads orient themselves towards the inside of the micelle.
-
classify each chemical reaction: reaction type of reaction (check all t…
1. combustion 2. double replacement, acid - base 3. decomposition 4. combination
-
classify each chemical reaction: reaction type of reaction (check all t…
$2H_2O(g)\to2H_2(g)+O_2(g)$: decomposition $HBr(aq)+NaOH(aq)\to NaBr(aq)+H_2O(l)$: double replacement, acid - base $2CH_3(CH_2)_2CH_3(g)+13O_2(g)\to8CO_2(g)+10H_2O(g)$: combustion…
-
solid iron reacts with aqueous copper(ii) sulfate (cuso₄) to produce so…
$Fe(s)+CuSO_4(aq) ightarrow Cu(s)+FeSO_4(aq)$
-
oxygen gas reacts with nitrogen monoxide gas to produce nitrogen dioxid…
$O_2(g)+2NO(g) ightarrow 2NO_2(g)$
-
solid magnesium hydroxide decomposes into solid magnesium oxide and gas…
$Mg(OH)_2(s) ightarrow MgO(s)+H_2O(g)$
-
balance the chemical equation below using the smallest possible whole n…
$P_4(s)+3NaOH(aq)+3H_2O(l) ightarrow3PH_3(g)+Na_2HPO_3(aq)$
-
identify: tetrasaccharide a disaccharide polysaccharides monosaccharides
Monosaccharides
-
identify: tetrasaccharide polysaccharide monosaccharide disaccharide
Tetrasaccharide
-
balance the chemical equation below using the smallest possible whole n…
$CH_4(g)+2O_2(g) ightarrow CO_2(g)+2H_2O(g)$
-
balance the chemical equation below using the smallest possible whole -…
$CH_3(CH_2)_5CH_3(l)+11O_2(g) ightarrow7CO_2(g)+8H_2O(g)$
-
all carbohydrates are made up of carbon, hydrogen, and oxygen atoms. tr…
True
-
based on this virtual experiment, what color do starches (carbohydrates…
B. dark blue - black