Unknowsus

Which of the following scenarios is an example of thermal energy being removed and the particles slowing down due to this change in energy? A) An ice cube melting on a sidewalk in the summer B) An ice-cold coke can with condensation forming on the outside...

A 300 kg tree burns to the ground, leaving only ashes. The weight of the ashes after the burn is 10 kg. Explain these results. A) The remaining ashes were newly created mass from the old 300 kg tree. This is how new matter can be created during a chemical...

Two friends are discussing physical and chemical changes. Anna says that when you eat, it is a physical change because when you chew, the food is only being changed into smaller pieces. Elsa says that when you eat, it is a chemical change because your bod...

Raya collected data about a substance. She noted that: -- its density is 10 g/cm3 -- its melting point is 200 degrees celcius -- it reacts with oxygen -- its color is blue-green Which property that she observed is a chemical property? A) its density is 10...

What types of atoms have the same number of electrons and protons? A) all atoms B) stable atoms C) ions D) metalloids

Which statement is true about atoms? A) Most of the mass of an atom is found in the electron cloud. B) Protons and electrons both have a mass of 1 AMU. C) You can find the atomic mass by adding the number of protons and electrons. D) The number of protons...