1. Los átomos son la unidad básica de la materia, la estructura que define a todos los elementos y con propiedades bien
definidas como la de estar en estado sólido, liquido o gaseoso.
Todos los elementos químicos de la tabla periódica están
compuestos por átomos con exactamente la misma estructura
y, a su vez, estos se componen de tres tipos de partículas,
como los protones, los neutrones y los electrones. Una
conclusión válida de la anterior información es que
A. las propiedades químicas de la materia son los protones,
neutrones y los electrones.
B. la estructura de la materia contiene tres partículas
atómicas.
C. todos los elementos químicos de la tabla periódica presentan
diferentes tipos de átomos.
D. los átomos no presentan propiedades químicas
definidas.​

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.

The identities of substances are the same before and after which type of change