Answer:
(a) Dissolving sugar in water ⇒ physical change
(b) Crushing rock salt ⇒ physical change
(c) Burning sulfur ⇒ chemical change
(d) Digesting a chili dog ⇒ chemical change
Explanation:
<em>Physical changes</em> are those in which the substance does not alter its composition. They only involve changes of states of matter and the chemical substance is stil the same after the change occurs. By other hand, <em>chemical changes</em> are those in which new subtances are formed. So, the subtance is not the same after the change.
(a) Dissolving sugar in water ⇒ <em>physical change</em>; because we obtain a solution of sugar in water (sugar is stil sugar).
(b) Crushing rock salt ⇒ <em>physical change</em>; because we obtain crushed salt, but the chemical composition of the salt is not altered.
(c) Burning sulfur ⇒ <em>chemical change</em>; because sulfur is oxidized (chemical reaction) and new compounds are formed, for example sulfur dioxide.
(d) Digesting a chili dog ⇒ <em>chemical change</em>; because the digestion process is produced by the action of hydrocloric acid, and new compounds are formed.
Platinum, Copper, Palladium, Silver
Explanation:
These metals noble metals that are inert and nonreactive to a large extent. This is why they used for a wide range of engineering works.
- They are classified as platinum group metals.
- These metals are a group of minerals that are inert and nonreactive.
- They have huge economic values.
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Answer:
Any of various particles of matter smaller than a hydrogen atom, including the elementary particles and hadrons.
Explanation:
Answer:
Because it takes tremendous effort to break free from the laws of gravity to exit the Earth's atmosphere
Explanation:
Answer:
Substances can be classified according to how these atoms are assembled and is known as Classification of Matter: All matter falls into one of three categories: elements, compounds or mixtures. Furthermore, mixtures can be classified as homogeneous or in homogeneous.