chemistry a semester exam?
new exam questions and answers
1. Fe2O3+3H2SO4
how many atoms of oxygen will be found in the product(s) of the reaction?
12
15**
3
4
answer: 15
sorry i wanna play roblox so here are the rest answers;
2. the number of atoms, types of elements, and mass of reactants and products are equal.
3. 64 grams
4. 1.503x10^23
5. polar sugar molecules dissolve in water, which is polar.
6. high temps mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility.
7. it accepts protons and only partially dissociates in water.
8. ph3 is stronger acid than nh3
9. cooling a purple solution will turn it pink
10. both are flexible, but one conducts electricity while other insulates.
11. high pressure, high temp water extraction
12. reducing environmental impact
13. the scientist is investigating charles’s law, which shows that temp and vol are directly proportional.
14. the relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same
15. fission is a process in which a large nucleus is split into smaller nuclei
16. beta-minus decay
17. alpha decay
17/17
100% <333
i dont think we can help unless we have questions shown for us to answer
yes, it is possible because they have similar intensive properties
homogeneous mixture
they have no attraction to eachother, they move faster than molecules of a liquid or gas
due to repulsion between elections, valence electrons will be arranged as far apart from
each other as possible
aluminum has 6 electrons in its p orbital, carbon has 2 electrons in its p orbital
neutral atoms lead must have 82 protons, ions must have 82 protons, as well
experiments that identified…
a covalent bond would form because the electron would be shared so both hydrogens have a full, stable shell
K and Cl
0
it has a higher boiling point than water, and it likely has stronger electrostatic forces between its molecules than water
castor oil
substance b has stronger bonds, and it takes more energy
the student should preform multiple trials of the same experiment, then take the
average of all of the results
the results of several trials are all very close to each other, but they are noticeably different from the accepted value for the boiling point.
it will likely be unreactive
student b, because of the law of conservation of matter
the atoms have the same electronegativity
bromine br
no, it will not because iodine is less reactive than chlorine
AI2Si206H4
6H20 + 6C02 - C6H1206 + 602
+2
methane, CH4
0.24 M
cS-br
fr-cl = 2.46
hotter molecules have more kinetic energy
the reaction is exothermic
anabolism
every process that takes place in mitosis also takes place in meiosis
mrna
polysaccharides
more bond energy is absorbed on the reactants side than is released on the products side
an exothermic reaction
endothermic reactions have a higher activation energy. endothermic reactions require more energy to break up the bonds of the reactants
heat must be released by the products in order to convert from the reactants
100% :)
angel (^ *-* ^) i was making my own question to answer it for other people lol
Then you failed to make a case for anything.
To prepare for a chemistry semester exam, it's important to understand the key concepts, review class notes, and practice solving problems. Here are some steps you can take to study effectively:
1. Review your class materials: Go through your lecture notes, textbooks, and any other resources provided by your instructor. Pay special attention to the topics that were emphasized or covered in detail during the semester.
2. Organize key concepts: Create an outline or a summary sheet of the main concepts you need to know for the exam. This will help you identify any gaps in your understanding and prioritize your studying.
3. Practice problem-solving: Chemistry exams often include calculations and problem-solving questions. Work through sample problems from your textbook or practice exams if available. Pay attention to the steps and formulas used to solve different types of problems.
4. Understand reactions and equations: Make sure you understand the different types of chemical reactions, balancing equations, and predicting products. Review any specific reaction types or mechanisms that were covered in class.
5. Memorize important information: While understanding concepts is crucial, there may be certain facts, equations, or formulas that need to be memorized. Create flashcards or use mnemonic devices to help you remember these specific details.
6. Work with classmates: Consider forming a study group with classmates to review and discuss key concepts. Explaining concepts to others can deepen your own understanding, and your classmates may ask questions that you hadn't considered.
7. Seek additional resources: If you need extra help or clarification on certain topics, consider using online resources, such as educational websites, tutorial videos, or virtual simulations. These tools can provide alternative explanations and visual aids to supplement your learning.
8. Practice time management: Allocate enough time for each topic based on its significance and your level of understanding. Create a study schedule and set specific goals for each study session, ensuring adequate time for both reviewing and practicing problem-solving.
Remember, effective studying involves regular review over an extended period rather than cramming right before the exam. By understanding the subject matter, practicing problem-solving, and seeking help when needed, you can approach your chemistry semester exam with confidence. Good luck!