Answer:
A mixture is physical, while a compound is chemical.
Explanation:
A mixture is a combination of two or more substances that are physically mixed together. The components of a mixture can be easily separated from one another by physical means, such as filtration or evaporation. The substances in a mixture retain their individual properties and do not chemically react with one another. For example, a mixture of salt and sand can be separated by dissolving the salt in water and then filtering the mixture to remove the sand particles. Each component of the mixture retains its own properties throughout the process. On the other hand, a compound is a substance that is made up of two or more different elements chemically combined in fixed proportions. The components of a compound are held together by chemical bonds, resulting in a new substance with different properties from the original elements. Compounds cannot be easily separated into their individual components by physical means. For example, water (H2O) is a compound made up of hydrogen and oxygen. The elements hydrogen and oxygen chemically react to form water, and it is not possible to separate the hydrogen and oxygen in water by physical means alone. In summary, a mixture is a physical combination of substances that can be easily separated, while a compound is a chemical combination of elements that cannot be easily separated. Mixture components retain their individual properties, while compounds have properties different from their component elements.
B)absorbs harmful radiation.
C)helps clouds form.
D)causes rain to fall.
2.
A. a
B. b
C. c
D. d
Answer:
B
Explanation:
Ozone in the Earth's atmosphere is crucial because it absorbs most of the sun's harmful UV radiation, protecting living beings from potential health risks. The correct answer is option B.
The ozone in Earth's atmosphere is primarily important because it absorbs harmful radiation. More specifically, it absorbs the majority of the sun's ultraviolet (UV) radiation, which can cause a variety of health issues like skin cancer and cataracts in humans and can also be detrimental to certain types of plant and marine life. Without the protective layer of ozone, these harmful UV rays would reach Earth's surface in much larger amounts.
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G The electrons are outside the nucleus and have no charge.
H The electrons are inside the nucleus and have a negative charge.
The electrons are outside the nucleus and have a negative charge.
which is correct
Answer:
D. The electrons are outside the nucleus and have a negative charge.
Explanation:
Electrons are located outside the nucleus while protons and neutrons are located inside the nucleus.
Electrons are negatively charged and attracted to nucleus as the nucleus carry protons that are positively charged and neutrons have no charge.
Electrons are arranged in different energy levels based on the attraction between the positively charged nucleus and negatively charged electron.
Hence, the correct answer is "D. The electrons are outside the nucleus and have a negative charge."
B) Polaris
C) Both A & B
D) The north pole