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JulijaS [17]
1 year ago
12

HELP!!!! Will mark give 5 stars and thank!! Please!

Chemistry
1 answer:
Aloiza [94]1 year ago
7 0

Answer:

An endothermic reaction is a reaction where heat is taken in from the surroundings. This could be in the process of vaporisation from liquid to gas. However an exothermic reaction is when heat is given out to the surroundings. An example of this would be condensation gas to liquid!

Explanation:

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A student is worried about determining if a chemical is radioactive. Which
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Answer:

Hazards Identification

Explanation:

A safety data sheet, SDS, is an informational document provided by the manufacturer or importer of a hazardous chemical detailing the chemical, physical, health, and environmental health hazards associated with the chemical as well as safety precautions in handling the chemical.

Some of the sections in the SDS include:

Product Information: It identifies the chemical as well as its recommended uses. The contact information of the manufacturer is also provided.

Fire fighting methods: It gives measures and guidelines necessary for fighting a fire caused by the chemical.

Physical and chemical properties: states the physical and chemical properties of the chemical substance such as:  appearance, odor, pH, melting/freezing point, boiling point and boiling range, flammability, etc.

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<em>From the above information provided, the student should refer to the hazards identification section.</em>

8 0
3 years ago
What is the percent composition of calcium fluoride
vladimir1956 [14]

Answer:

78.07

Explanation:

them seperatly is

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Fluorine F 48.667%

8 0
2 years ago
A gas evolved during the fermentation of sugar was collected at 22.5°C and 702 mmHg. After purification its volume was found to
miskamm [114]

Answer:

A) 0.95 mol

Explanation:

We will assume the gas given off in the fermentation is an ideal gas because that allows us to use the ideal gas equation.

PV  = nRT

First let's convert all measurements to units that we can use

P = 702 mmHg * 1 atm/760 mmHg = 0.92368 atm

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R = 0.08206 L-atm/mol-K

T = 22.5 °C +273.15 = 295.65 K

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0.92368 atm * 25.0 L = n * 0.08206 L-atm/mol-K * 295.65 K

                                  n = 0.9518 mol

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3 years ago
Which type of rock forms as a result of cooling and crystallization?
allochka39001 [22]
Igneous <span>rock ! Of course oh how i miss middle school.........</span>
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3 years ago
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