It is true that human impact on one system leads to changes in more of Earth’s systems.
Answer: Option A
Explanation:
Human impact had created large impacts on Earth’s systems. The pollution in air, deforestation, dumping of lakes lead to several changes in environment. Also emission of carbon, methane and other hazardous gases from several manufacturing unit effect the environment.
Along with this, increase in usage of non-renewable fuels and release of CFC's emitted from AC’s, fridge lead to elimination of ozone layer making the environment open to direct UV radiation. So yes, it is true that human impact on one system leads to changes in more of Earth’s systems.
Answer:
true
Explanation:
Explain why NH3 has stronger intermolecular forces of attraction than Cl2
Answer:
Because of Hydrogen Bonding!
Answer:
NH3 has stronger intermolecular forces compared to Cl2, due to NH3 having polar molecules, and hydrogen bonding.
Explanation:
There are three types of intermolecular forces:
Dipole-Dipole interactionsLondon Dispersion forcesHydrogen bondsCritical Thinking Questions
8. What relationship exists between an atom's valence electrons and the number of dots in the
Lewis structure of the atom?
Answer:
the dots on a lewis structure represent valence electrons so they are the amount of valence electrons in the lewis structures atom
2. When Thomson held a positively charged plate near the cathode ray, the beam bent toward the plate. What conclusion can be drawn from this observation? (2 points)
The beam was made of light.
The beam was positively charged.
The beam was negatively charged.
The beam was made of neutrons.
Answer:
option B is correct : The beam was positively charged.
Explanation:
In 19th century J.J Thomson conducted an experiment on cathode ray tube. These cathode ray tubes were sealed glass tubes inside which the pressure of the gas reduced by evacuating air. Then he applied a high voltage across two electrodes at end of the tube, that voltage caused a beam of particles to flow from the cathode to the anode.
Beam of the particles were originated at the cathode and detected on anode by a phosphorous beyond the anode. As at that time phosphorous sparks and emit light.
To test properties of particles he places two opposite charged electric plates around the cathode rays that is one negative and one positive plate.
Thomson observed that these rays deflected to positive electric plate so it indicated that these rays are composed of negatively charged particles as it was attracted by the positive charged electric plate. These particles later named as electrons.
So,
option B is correct : The beam was positively charged.
16. Nuclear decay is a random event and
A. is independent of other energy influences
C. can be sped up upon cooling
B. can be sped up upon heating
D. can be sped up at room temperature
Answer:
A. Is independent of other energy influences
Explanation:
Nuclear decay occurs at a constant rate. The rate of decay is independent of temperature.
B, C, and D are wrong. The decay rate cannot be sped up or slowed down at ordinary temperatures.
"The correct answer is C. can be sped up upon cooling.
Nuclear decay is a process that occurs when an atomic nucleus emits radiation in the form of particles or electromagnetic waves. This process is random and is not influenced by external factors such as temperature, pressure, or chemical state. The rate of decay of a radioactive substance is characterized by its half-life, which is the time required for half of the radioactive atoms in a sample to decay.
The half-life is a fundamental property of a radioactive isotope and is not affected by external conditions. Therefore, the statements A, B, and D are incorrect:
A. Nuclear decay is independent of other energy influences, meaning that external energy sources or conditions do not affect the rate of decay.
B. Nuclear decay cannot be sped up upon heating. The decay rate is intrinsic to the isotope and does not change with temperature.
D. Nuclear decay cannot be sped up at room temperature. Room temperature does not have any significant effect on the decay rate.
C. However, it is worth noting that certain nuclear reactions, not the decay itself, can be influenced by temperature. For example, nuclear fusion reactions, which are different from decay processes, can be affected by temperature because they involve the combining of light atomic nuclei to form heavier ones, and higher temperatures can provide the necessary energy to overcome the repulsive forces between positively charged nuclei. In the context of nuclear decay, the statement ""can be sped up upon cooling"" is not accurate in the sense that cooling does not affect the decay rate. The decay rate remains constant regardless of temperature changes. Therefore, the correct statement should be that nuclear decay is independent of temperature changes, and none of the options provided accurately describe the influence of temperature on nuclear decay.
In summary, the decay of a radioactive nucleus is a random process with a constant probability per unit time, and the rate of decay is not affected by external conditions such as temperature. The correct answer to the question is that nuclear decay cannot be sped up or slowed down by any known external means, including heating, cooling, or maintaining the sample at room temperature."
Ionising radiation is emitted all the time by __________ sources. What one word completes the sentence?
Radioactive
Explanation:
A substance that gives out radiation all the time is unstable, therefore called radioactive.
I checked the answer myself and got it correct so i hope that this helps. (✿◡‿◡)
The statement, that describes ionizing radiation is emitted all the time is by "radioactive sources."
What is an ionizing radiation?Ionizing radiation is the radiation released by unstable nuclei because it can dislodge outer electrons from atoms, forcing them to form ions as it passes through matter. This radiation generates energy from either natural or man-made sources.
Ionizing radiation is a type of energy that atoms emit as electromagnetic waves or particles. People are exposed to ionizing radiation from both natural sources, such as soil, water, and vegetation, and man-made ones, such as x-rays and medical gadgets. Ionizing radiation sources include radioactive materials that emit radiation all the time.
Hence the correct answer is radioactive sources.
Learn more about ionizing radiation here
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