Emergency me 100 points 5 basic questions
question 1
when an atom of calcium (ca) forms an ion by losing two electrons, what is the ion’s type and charge?
cation, 2+
anion, 2+
cation, 2−
anion, 2−
question 2
which options describe a heterogeneous mixture?
select all that apply.
cool air mixes with warm moist air, and the mixture condenses to form fog.
a cookie made from flour, eggs, sugar, butter, and chocolate chips.
melted copper and zinc are blended together and the mixture cools to form brass.
sugar and flavorings are dissolved in water, and the mixture is bottled to form a tasty beverage.
question 3
what correctly explains a specific characteristic of a physical property of matter?
melting point is a physical property of matter because when a substance melts, it changes state from a solid to a liquid but is still the same substance.
reactivity is a physical property of matter because when a substance reacts, it changes into a new substance.
boiling point is a physical property of matter because when a substance boils, it changes its state of matter and is no longer the same substance.
freezing point is a physical property of matter because when a substance freezes, it changes state from a liquid to a solid and all its properties change.
question 3
why is melting point considered a physical property?
melting point is the temperature at which a substance changes from a liquid to a solid state. it is a physical property because measuring melting point does not change the identity of the substance.
melting point is the temperature at which a substance changes from a solid to a liquid state. it is a physical property because measuring melting point does not change the identity of the substance.
melting point is the temperature at which a substance changes from a solid to a liquid state. it is a physical property because measuring melting point changes the identity of the substance.
melting point is the temperature at which a substance changes from a liquid to a solid state. it is a physical property because measuring melting point changes the identity of the substance.
question 4
a potassium ion will commonly lose an electron to form an ion. when a potassium (k) ion is formed, what is its charge and why?
a potassium ion will form a 1− charge because it will have more neutrons than electrons.
a potassium ion will form a 1− charge because it will have more protons than electrons.
a potassium ion will form a 1+ charge because it will have more neutrons than electrons.
a potassium ion will form a 1+ charge because it will have more protons than electrons.
question 5
based on electrostatic forces, how would two electrons interact with each other?
the electrons would attract each other because they have the same charge.
the electrons would repel each other because they have the same charge.
the electrons would bond with each other because they have the same charge.
the electrons would not interact with each other because they have the same charge.