[justmoi]

hey guys.. i just finished my 1st quiz (online class) and just submitted my answer, just wonderfin if i did good! i wont find out what i get till tom. can someone check how i did
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Question 1  (1 point) A sample of ocean water consists of water, chloride ions, sodium ions, and several other dissolved ions. The ions are evenly distributed throughout the ocean water. Which term or terms could be used to describe this sample of ocean water?

a.a homogeneous mixture
b.a heterogeneous mixture
c.an element.
d.a pure chemical substance
e.a compound *
f.a solution

Question 2  (1 point)A sample is composed completely of silver, absolutely free of impurities. Which term or terms could be used to describe this sample?

a.a heterogeneous mixture
b.a homogeneous mixture
c.a solution
d.a pure chemical substance
e.a compound
f.an element. *

Question 3  (1 point)A sample contsits of orange juice with ice cubes present. Which term or terms could be used to describe this sample?

a.a heterogeneous mixture *
b.a homogeneous mixture
c.a solution
d.a pure chemical substance
e.a compound
f.an element.

Question 4  (1 point)A balloon is filled with pure carbon dioxide. Which term or terms could be used to describe the contents of this balloon

a.a heterogeneous mixture
b.a homogeneous mixture
c.a solution
d.a pure chemical substance
e.a compound *
f.an element.

Question 5  (1 point)Which term or terms could be used to describe salt dissolved in water?

a.a heterogeneous mixture
b.a homogeneous mixture *
c.a solution
d.a pure chemical substance
e.a compound
f.an element.

Question 6  (1 point)Which term or terms could be used to describe methane, CH4?

a.a heterogeneous mixture
b.a homogeneous mixture
c.a solution
d.a pure chemical substance
e.a compound *
f.an element.

Question 7  (1 point)A sample of hydrogen has many properties, which of the following are chemical properties? (Include all the apply.)

a.It is a gas. *
b.It reacts with oxygen to form water.
c.It is compressible.
d.It reacts with chlorine to make hydrogen chloride gas. *
e.It does not conduct electricity.

Question 8  (1 point)Which of the following are physical properties of an ice cube? (Select all that apply.)

a.It is cold to the touch. *
b.Left in a room it melts to form liquid water. *
c.It has a density of 0.984 g/cm3 *
d.It reacts with carbon dioxide to form carbonic acid.

Question 9  (1 point)Consider the change:
CH4(g) +2O2(g) --> 2H2O(l) + CO2(g) Which term or terms describes this change?

a.evaporation
b.physical change
c.chemical change *
d.condensation

Question 10  (1 point)Consider the change: CO2(g) --> CO2(l)
Which term or terms describes this change?

a.chemical change
b.physical change *
c.evaporation
d.condensation

[Arkcon]

I see some mistakes that you don't repeat later in the same quiz.  Be more careful, the click-click-click nature of online quizzing can make you sloppy.

[Kryolith]

Assuming that every compound is a chemical substance, I would give you 1/10 points (only #3 is correct). Perhaps 2/10 for #8.

[irishnenglish]

LOL O DEAR!!!!

Question 10  (1 point)Consider the change: CO2(g) --> CO2(l)
Which term or terms describes this change?

CONDENSATION PERHAPS?

I mean who am I to know, I'm only a school kid


hehe

[Kryolith]

Question 10  (1 point)Consider the change: CO2(g) --> CO2(l)
Which term or terms describes this change?

CONDENSATION PERHAPS?

You are right. And a condensation is usually considered as a physical process (although one could argue about that...)

[irishnenglish]

 

thankyou


Yer i thought it can be reversed and therefore a chemical change