States of matter
Lists the states of matter?
Solid, liquid, gases, plasma, bose-einstein condensate
what are all phase transition ?
melting, freezing, evaporation, condensation, sublimation and deposition
what are physical properties?
are characteristics that can be measured without the change of the composition
what is an atom?
is the smallest unit of matter
how many periods and groups are there in the periodic table
there are 7 horyzontal periods and 18 vertical columns(groups)
Why a solid mantein a fixed shape ?
Becouse the particles that make up the solid are packed closely together
How is called the phase that goes from solid to gas?
sublimation
why are mass and volume classified as extensive properties?
because they depend on the amount of material
which are the three subatomical particles?
protons, neutrons and electrons
what is the main difference between a molecule of an element and a molecule of a compound?
a molecule of an element consist on one or more atoms of the same kind while a molecule of a compound has different types of atoms
Why does a liquid take the shape of its container while a solid does not?
A liquid takes the shape of its container because its particles are close together but can move and slide past to another, while in a solid the particles are tightly packed and can only vibrate
What does steam means ?
the gaseous form of water
what makes chemical properties different from physical properties?
because they describe how a substance interacts with other substances
where are the subatomical particles located?
protons and neutrons in the nucleous while electrons orbitate around the nucleous
who was the chemist that first standardized the periodic table?
dimitri mendeleev
Why can gases be compressed easily while liquids and solids can't?
because in a gas the particles are bonded by weak forces while in a liquid and in a solid the particles are close togheder by strong forces
in chemistry or microbiology a sistem is the portion of matter that is being investigated?
false
how can you tell if a phenomenon is physical rather than a chemical?
because in a physical the substance has the same composition while in a chemical it changes
what is the difference between mass number and atomic number?
the atomic number is the number of protons while the mass number is the total number of protons and neutrons
how is a covalent bond formed?
when two atoms share a pair of electrons
which are the conditions to form bose Einstein condensate?
extremely low temperatures
what are the particles that have more energy in evaporation?
the particles on the surface
why a chemical phenomena involve the appearance of new substances?
because in a chemical phenomena we have structural rearrangements of the particles when two substances enter in contact
how can an atom become an ion and what determines its change?
an atom become ion when it gains on loses electrons.
explain how molecular structure can influence the chemical and physical properties of a substance? give at least two examples
molecular structure determines the 3d arrangement of atoms such as reactivity and polarity