Matter Around us -pure or mixture?

Which of the following statements are true for pure substances?

(i) Pure substances contain only one kind of particles

(ii) Pure substances may be compounds or mixtures

(iii) Pure substances have the same composition throughout

(iv) Pure substances can be exemplified by all elements other than nickel

• (a) (i) and (ii)

• (b) (i) and (iii)

• (c) (iii) and (iv)

• (d) (ii) and (iii)

Which of the following are homogeneous in nature?

(i) ice (ii) wood (iii) soil (iv) air

• (a) (i) and (iii)

• (b) (ii) and (iv)

• (c) (i) and (iv)

• (d) (iii) and (iv)

Which of the following are physical changes?

(i) Melting of iron metal

(ii) Rusting of iron

(iii) Bending of an iron rod

(iv) Drawing a wire of iron metal

• (a) (i), (ii) and (iii)

• (b) (i), (ii) and (iv)

• (c) (i), (iii) and (iv)

• (d) (ii), (iii) and (iv)

Which of the following are chemical changes?

(i) Decaying of wood

(ii) Burning of wood

(iii) Sawing of wood

(iv) Hammering of a nail into a piece of wood

• (a) (i) and (ii)

• (b) (ii) and (iii)

• (c) (iii) and (iv)

• (d) (i) and (iv)

Combination of two or more pure substances that are not chemically combined

• compound          
• atom
• mixture 
• element

A mixture that is uniform and well mixed is _____.

• homogeneous
• hetergeneous
• pure substance
• compoud

This is made up of one or more of the SAME kind of atom

• Element
• Mixture
• Compound
• Matter

Tags

NGSS.MS-PS1-1

___________ are the smallest unit of an element that maintains the properties of that element.

• Atoms

• Elements

• Compounds

• Mixtures

Tags

NGSS.MS-PS1-1

Elements are broadly classified as metals, nonmetals, and _________________.

• compounds

• organic

• metalloids

• Metallica

A ______________ mixture is one that does not have a uniform composition.

• heterogeneous

• homogenous

• pure substance