Question

Solids are often defined as having a definite shape, while gases and liquids have no definite shape. This can best be explained by the fact that
A) solids have a more ordered arrangement of atoms than liquids and gases.
B) in solids molecules move faster than in liquids or gases.
C) solids have less internal energy than liquids and gases.
D) solids have the least orderly internal structure.
15)
Color, shape, texture, and size are _____________ properties of matter.
A) chemical
B) liquid
C) physical
D) solid
16)
Which is evidence that a chemical reaction has occurred?
A) a phase change occurs
B) a new gas is observed in the form of bubbles
C) red and yellow paint mixing to make orange paint
D) the temperature of the substance remains constant
17)

reactant → product
If there are 4 grams of reactant, how many grams of product are produced by the chemical reaction?
A) 0 grams
B) 2 grams
C) 4 grams
D) 8 grams
18)
Which of these is an example of a physical change?
A) iron melting
B) steel rusting
C) paper burning
D) wood decaying
19)

A + B + C → D + E
Describe the mass of the reactants and products given the balanced chemical reaction.
A) The mass of the products is 2/3 that of the reactants.
B) The mass of the reactants equals the mass of the products.
C) The mass of the reactants is less than the mass of the products.
D) The mass of the reactants is greater than the mass of the products.

Answer 1

B) C) B) C) A) B) should be your answers

Answer 2

1) Solids have a more ordered arrangement of atoms than liquids and gases and this give solids a definite shape

2) When we defined colour, shape , texture and size of any matter we are defining the physical properties of matter (may be it is solid liquid or gas)

3) If there a new gas is observed in the form of bubbles, it means there must be some chemical reaction occuring or occured.

Like

CaCO3 (s)  --- > CaO(s)  + CO2(g)  so this is a chemical reaction.

4) There will be formation of four grams of product [law of conservation of mass]

5) Iron melting is a physical phenomenon

Steel rusting : a chemical reaction

paper burning : combustion is a chemical reaction

wood decaying : due to chemical action of environment.

6) The mass of the reactants equals the mass of the products.