A chemist is given an unknown gas sample. Which observation describes a chemical property of the sample?
Consider the chemical reaction described asethylene + hydrogen > catalyst > ethaneIdentify the products(s) in this example.

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Consider the reaction below. How many grams of C will be needed when 5.00 grams of Na2SO4 reach are produce 3.09 grams of CO2 and 2.75 grams of Na2S?
you have 1.0 gram of iron and iron and 1.0 gram of lead. The specific heat of iron is 0.473J/g C and the specific heat of lead is 0.0305 j/g C
The farther apart two oppositely charged particles are to each other the stronger their force of attraction will be.
Main group elements that are non-metals usually ___ one or more electrons to form ___ which have a ___ charge.

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three atoms of nitrogen, twelve atoms of hydrogen, one atom of phosphorus, and four atoms of oxygen (B)
If an element G could react with sulfur to form an ionic compound with formula GS2, the charge on the ion formed by G would be ___
I have a beaker which contains 100 mL of a pure liquid. I determine that the freezing point is -10 degrees C. I now dissolve a second compound into the liquid. What will happen to the freezing point?
A 1.0 - kg sample of antimony took 46.0 kj of heat, thus raising the temperature of the Antimony from 20.0 degrees C to it"s melting point 630.0 degree C. Calculate the the specific heat of antimony in calories> 1 calorie = 4.184 J
Classify as either a physical change or chemical change.A. a nail rustingB. grating cheese for a meal C. firecracker exploding
A. chemical change because metal is changing to rustB. physical because cheese remains the same just different shapeC. Chemical change because fireworks is exploding and cannot change back
Explain how the law of definite composition and the law of multiple proportions using water H2O and hydrogen peroxide H2O2 as examples.
A. Law of definite composition:Compounds can have the same element but different mass ratios H2O=(H) 2.02 (O) 16H2O2 = (H) 2.02 , (O) 32B Law of multiple proportions:Compounds can have the same element by different atom ratio2:1 H2O, 2:2 H2O2
The mass of a sodium atom in atomic mass units is 23.0 amu. what doe the atom weigh in grams? express your answer with the correct number of significant figures. ( 1 amu = 1.660539 x 10-24g)

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