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# Chemistry

Bonita Tromp

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2021-11-02 18:34:37
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Cards in this guide (31)
What is an intensive property

In chemistry, an intensive property is a property that depends on the type of matter in a sample.

How many hours does an Electrician work

Most electricians work for a standard 35-40 hours in a week. However, once established, being an electrician is quite lucrative (it certainly is in Australia) and many have their own assistants and / or employees and can afford to spend a little more time off.

On a trip to Italy Cheyne rented a car to tour the country As he turned onto the highway he noticed that the speed limit was 95 kmh How fast can Cheyne drive in mph

Cheyne can drive 59 mph.

Which process would be most appropriate to separate a mixture

Filtration. :)

How many feet in one marla

1 marla= 272.25 square feet

Is odor an extensive or intensive property

intensive

Molten iron is extremely hot averaging about 1500C The specific heat of iron is 0.46 JgC How much heat is released to the atmosphere when 1kg molten iron cools to room temperature 25C

0.46 * 1475 = 678.5 Kjoules (The specific heat is given in terms of joules/ gramme/degC, whilst the question refers to 1kg ie 1000g )

A cork has a density of 0.240g cm3 what volume would 10.0 grams of cork have

density = mass/volume

volume= mass/density

The mean density of cork is 0,24 g/cm3.

And:

volume= 10 g/0,24 = 41,66 cm3

Is electric conductivity extensive or intensive

why electrical conductivity is an intensive property of matter

Calcium chloride is often used to de-ice roads in the winter What volume would 15.7 g calcium chloride occupy

6.28cm3

Carl's teacher has asked him to separate a mixture of sand and iron filings Which of these methods would correctly separate the mixture

the correct answer would be -( magnetic attraction of one part )

What is the specific heat of an unknown substance if 2000 J of energy are required to raise the temperature of 4 grams of the substance 5 degrees Celsius

q = m x C x Î”t, where q is amt of heat gained or lost, C is specific heat capacity, and Î”t is change in temperature.

Known:

q = 2000J

m = 4g

Î”t = 5oC

Equation:

C = q/mÎ”t

Solution:

C = 2000J/4g5oC = 2000J/20goC = 100J/goC

Which of these is a description of a chemical property

melting point

George intentionally threw a snowball directly at Chris The fact that the snowball will continue in the direction of Chris after leaving George's hand is an example of the snowball's

inertia

The last thing you should do before leaving the laboratory is

Classify texture as intensive or extensive

Texture is classified as intensive.

Stella described her chemistry notebook as being a green rectangle with curved edges It measured 30.0 cm x 22.1 cm What kind of properties did Stella describe

physical properties (:

Classify copper tubing as homogenous or heterogenous

Copper tubing is homogenous.

Classify this property as homogenous or heterogenous Click on the correct answer

homogeneous

Classify this property as intensive or extensive height

extensive

Classify this property as intensive or extensive width

Width is extensive.

Express this amount in dozens Use decimal form 7.5 cupcakes

6.25 (:

An ancient copper coin was found to absorb 545.8 J of heat when the temperature increases 31.4C The specific heat of copper is 0.387 JgC What is the mass of the copper coin

44.9g

Thuy's mother asked her to mix some baby formula by adding two scoops of the powdered formula mix to one liter of water then stirring well When she has correctly made the baby formula what will Thu

solution or mixture

How many significant digits are in the number 0007080

4 A+

A 050g ball of aluminum foil absorbs 1.42j heat when it is heated 31.6c what is the specific heat of aluminum foil

0.90 J/g°c

Which of the following is not a description of a physical property height density flammability melting point

flamability

While doing a demonstration for his class Mr Mathras dropped a peasized piece of silver solid into a beaker of distilled water The solid began fizzing then swirling before bursting into a yellow flame

Yellow flame

How many hours does a psycriatrist work ina day and how many days a week

A psychiatrist works an average of 8 hours per day, 5 days per week.

What Express this amount in dozens. (Use decimal form.) 75 pies

It is 6.25 dozen.

What classify melting point property as intensive or extensive

Melting point is an intensive propery because doesn't depend on the mass of sample.

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