Chemistry :asked onShaylaaaaaaaa
17.05.2023the following question
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I think the answer is B.
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Chemistry
Where do most earthquakes occur ? a. within volcanoes where plates interact b. whar plates interact c. whar plates diverge d. at hot spots
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I think the answer is B.
Chemistry
rheumatoid arthritis is a disorder in which the joints swell and cause pain. rheumatoid arthritis causes the bodys own immune cells to attack the membrane of the joints. which body system does rheumatoid arthritis affect
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Answer: musculoskeletal
Explanation: The musculoskeletal system is a functional set of skeletal bones, their connections (joints and synarthrosis) and somatic musculature. Rheumatoid arthritis affects the joints, respectively, the musculoskeletal system of the body is most affected.
Chemistry
Which of the following statements about the properties of elements related to an atomic emission spectrum are true? Select all that apply. A. An atomic emission spectrum occurs when an element in the gas state absorbs energy, and emits light which corresponds to the energies of specific electrons. B. An atomic émission spectrum occurs when an element in the solid state absorbs energy, and emits light which corresponds to the energies of specific electrons. C. The light that an element emits is made up of a limited number of narrow lines of light
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Answer: A, C, E.
Explanation: A) An atomic emission spectrum occurs when an element in the gas state absorbs energy, and light that corresponds to the energies of specific electrons.
Atomic spectra occur when electromagnetic radiation is emitted or absorbed by ions, free or weakly bound atoms (in gases or vapors) => NOT in a solid state
C) The light that an element emits is made up of a limited number of narrow lines of light that produce a unique pattern, or atomic emissions spectrum, for that element.
Each elements emission spectrum is distinct because each element has a different set of electron energy levels. The emission lines correspond to the differences between various pairs of the many energy levels. The lines (photons) are emitted as electrons fall from higher energy orbitals to lower energies.
E) An atomic emission spectrum shows that pattern formed when light emitted by an element is separated into its different component wavelengths.
Atomic spectra caused by quantum transitions between different energy levels of free (weakly bound) atoms and resulting from the emission or absorption of electromagnetic radiation by them are linear, i.e. consist of separate spectral lines.
Chemistry
During an experiment vinegar without baking soda the following observations were recorded observation one: The container with the reaction mixture feels cooler Observation two: gas bubbles are released Based on the observation, justify the type of change (physical or chemical) that took place
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Answer: Chemical change.
Explanation: When vinegar (CH₃COOH) is added to baking soda (NaHCO₃) there is a chemical reaction involved which is neutralization. This reaction produces carbon dioxide which is observed as gas release of gas bubbles.
Simultaneously there is making and breaking of bonds and the energy needed to break the bond is greater than the energy released in making the bond thus the reaction is endothermic which overall decreases the temperature of container. Thus the feel of cooling is also a chemical change.
Chemistry
Pls fill in this sheet I need help thank you very much and also gimme how to do it :)
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Answer: We need to arrange the coefficients in the reaction equations (we need the sum of the coefficients on the left side of the equation to be equal to the right):
1) H2 + Cl2 = 2HCL
2) 2Zn + O2 = 2ZnO
3) 3Cl2 + 2Al = 2AlCl3
4) 4Na + O2 = 2Na2O
5) 2Mg + O2 = 2MgO
6) Mg + 2HCl = MgCl2 + H2
7) Fe2O3 + Al = Fe + Al2O3
8) CaCl2 + 2KOH = Ca(OH)2 + 2KCl
9) 2HCl + Na2CO3 = 2NaCl + H2O + CO2
10) HNO2 + NaOH = NaNO2 + H2O
11) 2HNO3 + Ca(OH)2 = Ca(NO3)2 + 2H2O
12) H2SO4 + 2KOH = K2SO4 + 2H2O
13) 2NaNO3 = 2NaNO2 + O2
Chemistry
match the project with the proper chemistry discipline
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Answer: look at the photo
Explanation: 1. biochemistry - study of the chemical processes that occur in living things. Metabolism, digestion, breaking down and using medications, etc.
2. organic chemistry - study of chemicals that contain carbon. Diamonds, humans, etc.
3. inorganic chemistry - study of chemicals that do NOT contain carbon. found in rocks and minerals, etc.
4. physical chemistry - study of physical and atomic properties in chemical systems. Reactions, physical structure of materials, etc
5. analytical chemistry - study of the composition of matter. such as analyzing the components of ink
Chemistry
Which phase of matter is the least common on earth? A: plasma B: liquid C: solids D: gases
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Answer: A: plasma
Explanation: Plasma is described as an electrically charged gas. Because of extreme temperatures, the particles move so quickly that their collisions release electrons from the atoms. This mixture of electrons and positively charged ions with high kinetic energy is described as the plasma phase.
Because of its extreme temperature, plasma is not common on Earth.
The sun and other stars are made of elements in the plasma state, and plasmas can also be found inside of a glowing fluorescent light bulb, the small fluorescent lights in plasma television screens, and at locations where high-energy lightning strikes in the air.
Chemistry
A passenger jet has a speed of 900 km/h. What is its speed in m/s?
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P Answered by PhD 1
Answer: 250 m/s
Explanation: If you need to convert from km/h to m/s, then you need to divide by 3.6, because there are 3600 seconds in 1 hour, and 1000 meters in 1 km.
900/3.6 = 250 m/s
Chemistry
How many liters of 3.0 M NaOH solution will react with 2.4 mol H2SO4? (Remember to balance the equation.) H2SO4 + NaOH → Na2SO4 + H2O (5 points) 1.2 L 1.6 L 2.4 L 2.8 L
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1.6 L is the volume of NaOH that has reacted
Explanation:
The balanced reaction is:
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
This is a neutralization reaction between a strong acid and a strong base. The products are the correspond salt and water.
We propose this rule of three:
1 mol of sulfuric acid needs 2 mol of NaOH to react to react
Then, 2.4 moles of H₂SO₄ will react with (2.4 . 2) / 1 = 4.8 moles of NaOH
As molarity is 3M, we can determine the volume of our solution
Molarity (M) = mol / volume(L) → Volume(L) = mol / Molarity
Volume(L) = 4.8 mol / 3 M = 1.6 L
Chemistry
which description best matches democritus s idea of the atom? a particle split into equal portions, a combination of small particles joined together, a particle that cannot be divided or destroyed, a gel with small particles spaced evenly throughout it
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Answer: a particle that cannot be divided or destroyed
Explanation: Democritus is a Greek philosopher440 B.C.E.thought you would eventually end up with a particle that could not be cut,this he called an atomfrom the word "atomos" meaning not able to be dividedHe thought that atoms are made of a single material formed into different shapes and sizesand that all atoms are small hard particlesDiscovered the atom
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