Chemistry and I think some physics

posted by .

Check my answers!
This site needs a preview post option!
And thanks for checking!


1. Classify each of the following pure substances as an element or a compound.
A) carbon
B) baking soda
C) nickel
D) gold
My answers: A) element B) compound C) element D) element


2. Perform the conversions
A) 345 Cal to kilowatt-hours
= 4x10^8 kWh

B) 23J to calories
= 5.5 cal

C) 5.7x10^3J to kilojoules
= 5.7kJ

D)326kj to joules
= 3.2x10^5J

3)Perform the following temperature conversions.

A) 102F to Celsius
= 38.8 C

B) 0(zero)K to Fahrenheit
= -459.4 F

C)48 C to F
=118.4F

D) 273K to C
= 0 C

4) calculate the amount of heat required to raise the temperature of a 27-g sample of water from 5 degrees celsius to 22 degrees Celsius.
= 1.91x10^3

5)An unknown metal is suspected to be gold. When 2.8J of heat are added to 5.6g of the metal, its temperature rises by 3.9 degrees Celsius. Are these data consistent with the metal being gold?
= 0.128 J/g C Yes its gold.





1. Classify each of the following pure substances as an element or a compound.
A) carbon
B) baking soda
C) nickel
D) gold
My answers: A) element B) compound C) element D) element

All of 1 ok.

2. Perform the conversions
A) 345 Cal to kilowatt-hours
= 4x10^8 kWh
Google shows 4E-4

B) 23J to calories
= 5.5 cal ok

C) 5.7x10^3J to kilojoules
= 5.7kJ ok

D)326kj to joules
= 3.2x10^5J I wouldn't drop the 6

3)Perform the following temperature conversions.

A) 102F to Celsius
= 38.8 C I get 38.88 which rounds to 38.9

B) 0(zero)K to Fahrenheit
= -459.4 F I get -459.67. Did you start with -273.15?

C)48 C to F
=118.4F ok

D) 273K to C
= 0 C ok

4) calculate the amount of heat required to raise the temperature of a 27-g sample of water from 5 degrees celsius to 22 degrees Celsius.
= 1.91x10^3 27*4.184*17=1.92E3

5)An unknown metal is suspected to be gold. When 2.8J of heat are added to 5.6g of the metal, its temperature rises by 3.9 degrees Celsius. Are these data consistent with the metal being gold?
= 0.128 J/g C Yes its gold. I assume you looked up the specific heat of gold. The value 0.128 J/g*C is correct.


The preview has been suggested.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. A.P Chemistry

    Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X 64.8% …
  2. A.P Chemistry

    Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X 64.8% …
  3. Chemistry (Check)

    Classify each of these statements as always true, sometimes true, or never true 1)___AT_____A mole of a pure substance contains 6.02 X 1023 atoms. 2)____ST____The representative particle of a compound is the molecule. 3)___NT_____A …
  4. chemistry

    The primary substance from which all other chemical compounds and substances are made is a____________. A) element B) compound C) mixture D) pure substance
  5. A.P. Chemistry

    Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X 64.8% …
  6. Chemistry

    I did the work, but I need help checking it... A compound contains 83.24% by mass carbon. Calculate the molar mass of the compound if it contains 5 moles of carbon per mole of compound. This was my process: I took 100g of compound …
  7. Chemistry(Please check)

    Classify the following functional groups: 1)CH3CH = CH2 I think this is an alkene 2) CH3CHCH3 I think it is an alcohol. ! OH Would you agree with my answers?
  8. chm

    How would you classify the following material?
  9. Chemistry

    Imagine that you have a pure sample of an unknown compound that you are told is either 2-naphthol OR benzoic acid. In the lab, you also have access to samples of pure 2- naphthol and pure benzoic acid. However, both of these pure substances …
  10. science-MS.SUE PLZ HELP

    Identify the following substances as pure substances, elements, compounds, mixtures, or solutions (answers may include more than one classification): mud, copper, salt water, carbon monoxide

More Similar Questions