Science test 22/22/22/22/22/22/22 Flashcards
Property changes, elements, compounds, & metals
Does color change indicate that a new substance has formed?
Yes
Does formation of gas indicate as evidence that a new substance has formed?
Yes
Does formation of perciptate indicate as evidence that a new substance has formed?
Yes
Does color change indicate as evidence that a new substance has formed?
Yes
Does change in state of matter indicate as evidence that a new substance has formed?
No
Does dissolving indicate that a new substance has formed?
No, it just changes the state of matter
Does increasing the temp indicate that a new substance has formed
Yes
What do all chemical changes do
Form new substances
What are bubbles evidence of
A gas being formed
True or False:
Crystals dissolving is not an indicator of evidence that a new substance was made
True
Precipitate is evidence that…
A new evidence has formed
What element makes up of most of earth’s atmosphere
Nitrogen (78%)
How are elements and compounds different?
A compound is represented by a chemical formula, and elements are represented by a chemical symbol
What 3 elements make up most living things on earth?
Carbon, hydrogen, and oxygen
The oceans are primary composed of which two elements?
Hydrogen and oxygen
The smallest particle of any particular type of matter is known by…
Atom
What three elements are most abundant in the plants and animals that make up the biosphere
Oxygen, carbon, hydrogen
Compounds are different than elements, because compounds are-
Combinations of 2 or more elements
Carbon is considered an element file. Carbon dioxide is considered a compound. This is because carbon dioxide is…
Made of 2 different elements
How many elements are in the compound Fe2O3
2
What is the best description of an elements?
A substance that cannot be broken down into simpler substances
When a precipitate forms it’s evidence that..
A new substance has formed
What is an element of a major component of living organisms
Carbon
Is water a compound
Yes
What is the property of nonmetals?
Low conductivity
Which element would be expected to have reactivity similar to that of phosphorous
Nitrogen
Why are electrical wires made from metal such as copper and chromium
Metals are good conductors of electricity
