False.
Heat speeds up the motion of particles when it is added to the object/substance the atoms loosen up and move/vibrate faster and more. But when subtracting heat from the object/substance, the atoms move/vibrate slower. This is called the Kinetic theory of matter.
Why does it belong in this category? This galaxy belongs to the elliptical galaxy category. This is because it does not have spiral arms. Moreover, it has a smooth light whose brightness decreases as it stretches out from the center.
Dry air is a mixture of nitrogen, oxygen, carbon dioxide etc.
air is a mixture of gases 78% nitrogen an 21% oxygen and other components.
Answer:
B. HCl, C. H2SO4, F. HNO3
Explanation:
Acids have hydrogen (H) at the beginning
bases have OH at the end
The answer is: A molecule with a difference in electrical charge between two ends.
Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.
Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.
For example fluorine has electronegativity approximately χ = 4 and oxygen χ = 3,5, fluorine attracts electron and he has negative charge and oxygen has positive charge.