Doing science, and having a bit of trouble.
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Which is the father of chemistry?
If a substance is ionic, then it likely will what?
Consider the unbalanced equation for the combustion of hexane:2C6H14(g)+19O2(g)→12CO2(g)+14H2O(g)Determine how many moles of O2 are required to react completely with 7.9 moles C6H14.
Write a chemical equation for the following decomposition reaction.Nickel(II) hydroxide(s) decomposes to produce nickel(II) oxide(s) and water.
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Answer:
Correct answer: B). Global climate is changing due to burning of fossil fuels and deforestation.
Forest holds a large amount of carbon, plants are known to absorb carbon dioxide from the atmosphere as they grow, that carbon dioxide is stored in plants in the form of carbon in plant's roots, leaves and in the soil. When trees are cut down, that stored carbon is released in the environment in the form of carbon dioxide, which accounts for approximately 18% of global greenhouse gas emission.
The burning of fossil fuel like coal, petroleum, oil, gas for the energy purpose is one of the major contributors for the rising level of carbon dioxide in the atmosphere, which leads to global warming and affect the climate.
Hence, the correct answer would be option B.
Explanation:
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1. Nucleus: Contains genetic material, controls cell activities.
2. Mitochondria: Produces energy through cellular respiration.
3. Golgi apparatus: Modifies and packages proteins.
1. Nucleus: The nucleus controls the cell by storing DNA instructions. It affects cell growth, reproduction, and metabolism by regulating gene expression.
2. Mitochondria: Cellular respiration powers mitochondria. They convert foods into cell energy source ATP. Metabolism and cell signalling depend on mitochondria.
3. Golgi apparatus: It changes and packages endoplasmic reticulum proteins and lipids. Cisternae are stacked membranous sacs. The Golgi apparatus adds carbohydrates or lipids to proteins, organises them into vesicles, and guides them within or outside the cell. It is crucial for intracellular transport and secretion.
Learn more about organelles, here:
#SPJ3
nucleus: controls cell
cell membrane: controls what goes in and out of a cell
cytoplasm: where chemical reactions take place
(2) The gas particles have no attractive forces between them.
(3) The gas particles are larger than the distances separating them.
(4) As the gas particles collide, the total energy of the system decreases.
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Ans: (2) The gas particles have no attractive forces between them.
The kinetic theory explains the behaviour of a hypothetical ideal gas. It explains pressure in terms of the collision of gas particles against the walls of the container which it occupies.
The kinetic theory of gases is based on three main postulates:
1) The collision between gas particles is elastic i.e. no energy is lost or gained
2) The gas particles are treated as point masses i.e. the volume occupied by the gas particles is negligible when compared to the volume of the container
3) There are no attractive or repulsive forces between particles.
The statement that describes the particles of an ideal gas, based on the kinetic molecular theory is .
Further Explanation:
Kinetic theory of gases depicts gas as a large number of particles that are in continuous random motion. It explains the macroscopic properties of gases by taking into account their molecular composition and motion.
Postulates of kinetic theory of gases:
i) The gas molecules are very small and are located far apart from each other. Most of the volume occupied by the gas is an empty space.
ii). The molecules of the gas are in rapid random motion. These can move in all directions.
iii). The gas molecules undergo collisions with each other and with the walls of the container. The collisions between molecules and container walls are responsible for the pressure of the gas.
iv). There is no loss of kinetic energy when gas molecules collide so their collisions are known as perfectly elastic.
v). No interaction occurs between different molecules of gas during collisions.
(1) The motion of the gas particles is orderly and circular.
The molecules of a gas move randomly in all directions so their motion is not orderly and circular.
(2) The gas particles have no attractive forces between them.
The molecules of a gas move randomly in all directions so their motion is not orderly and circular.
(3) The gas particles are larger than the distances separating them.
The particles of gas are very small and are situated far away from each other. So the distance between the particles is larger than their size and not vice-versa.
(4) As the gas particles collide, the total energy of the system decreases.
The collisions of gas molecules are considered to be perfectly elastic. So the total energy of the system remains constant. It neither increases nor decreases.
Therefore option (2) describes the particles of an ideal gas on the basis of the kinetic molecular theory.
Learn more:
- What is the kinetic energy of electrons? brainly.com/question/5031462
- Which statement is true for Boyle’s law: brainly.com/question/1158880
Answer details:
Grade: High School
Subject: Chemistry
Chapter: Ideal gas equation
Keywords: collisions, gas, random motion, kinetic energy, perfectly elastic, interaction, container, kinetic theory of gases, volume, motion, orderly, circular, decreases.
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3
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16
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The relation between number of half-lives (n) and decimal amount remaining (x) can be expressed as:
We need to calculate n, but we need x to do that. To calculate what percentage of a radioactive species would be found as daughter material, we must calculate what amount remained:
1.28 - 1.12 = 0.16
If 1.28 is 100%, how much percent is 0.16:
1.28 : 100% = 0.16 : x
x = 12.5%
Presented as decimal amount:
x = 0.125
Now, let's implement this in the equation:
Because of the exponent, we will log both sides of the equation:
Therefore, 3 half-lives have passed since the sample originally formed.
Answer:
3
Explanation: