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TiliK225 [7]
3 years ago
7

Which of the following observations would indicate that a material is a pure substance

Chemistry
2 answers:
Lena [83]3 years ago
3 0
What is the following
yaroslaw [1]3 years ago
3 0

It does not dissolve in water.

It changes color after heating.

It cannot be physically broken down into different types of atoms.

It can be physically broken down into different types of molecules.

^the options

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1. (8pt) Using dimensional analysis convert 600.0 calories into kilojoules
Ivanshal [37]

Answer:

1. 2.510kJ  

2. Q = 1.5 kJ

Explanation:

Hello there!

In this case, according to the given information for this calorimetry problem, we can proceed as follows:

1. Here, we consider the following equivalence statement for converting from calories to joules and from joules to kilojoules:

1cal=4.184J\\\\1kJ=1000J

Then, we perform the conversion as follows:

600.0cal*\frac{4.184J}{1cal}*\frac{1kJ}{1000J}=2.510kJ

2. Here, we use the general heat equation:

Q=mC(T_2-T_1)

And we plug in the given mass, specific heat and initial and final temperature to obtain:

Q=236g*0.24\frac{J}{g\°C} (34.9\°C-8.5\°C)\\\\Q=1495.3J*\frac{1kJ}{1000J} \\\\Q=1.5kJ

Regards!

7 0
2 years ago
Name 3 sources of carbohydrates for the production of an alcoholic drink
icang [17]

Answer:An alcoholic drink is a drink that contains ethanol, a type of alcohol produced by fermentation of grains, fruits, or other sources of sugar. The consumption of alcohol plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages.

Explanation: vodka the preferred alcoholic beverage of choice among alcoholics? #3 Doesn't make you feel bloated or full like beer does. It goes down quickly and smooth. #4 Gets you drunk just as fast as any other hard liquor can, and obviously much faster than beer or wine.

4 0
3 years ago
An emission of green visible light from the Cu2+ ion. The literature reports emission of blue visible light from the Cu+ ion. Ch
lord [1]
B. Increasing the effective nuclear charge on an ion results in energy levels that are closer together.
hope it helps
3 0
3 years ago
When force are ____ the object does not move
REY [17]

when forces are balanced the object does not move.

Explanation:

if you and your friend push both sides of the chair at the same time with the same amount of strength the chair wouldn't move.

3 0
3 years ago
Why are most household items made up of oxygen?
Alchen [17]
It is in our atmosphere
5 0
3 years ago
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