Homework helps pls.?

1. Which of the following is not an example of a model?


A. a floor lamp


B. a globe


C. a road map


D. a wind tunnel





2. A 1-g sample of the compound hydrogen chloride was analyzed and found to be 2.74 percent hydrogen and 97.3 percent chlorine. What percentage of hydrogen is present in a 2-g sample of hydrogen chloride?


A. 1.37%


B. 2.74%


C. 5.48%


D. 97.3%





3. The atomic number of an element whose atoms have 9 electrons and 10 neutrons is?


A. 9


B. 19


C. 1


D. 18





4.One isotope of carbon has 6 protons and 6 neutrons. The number of protons and neutrons of a second isotope of carbon would be?


A. 7 and 6


B. 6 and 7


C. 7 and 7


D. 6 and 6





5. If 9.0 g of water contain 1.0 g of hydrogen, what mass of oxygen is contained in 36 g of water?


A. 4.0 g


B. 8.0 g


C. 10.0


D. 32 g





Impossible chemistry questions 2 :(?


Is the following reaction a redox reaction? H2SO4 + 2NaOH- Na2SO4 + 2H2O


A. yes


B no


C if energy is added


Dit is impossible to determine


f you add 202g of Na2HPO4 to 2.00L of water, haveyou created a 0.750M Na2HPO4 solution?


A. yes


B it will be less than .750


C. It will be more than .750


D need more information


Calcium oxide can be prepared by heating calcium metal in oxygen. How much calcium would be needed to make 15.0g of calcium oxide?


A 5.3g


B 10.7g


c 15.5g


d 20.1g





# 19


A white solid is heaed in a test tube. The solid slowly changes color to a grayish powder and a gas escapes from the tube. Is the whit solid an element or a compound?


A. it must be an element since it underwent a chemical change.


B. It must be an element since it underwent a physical change


C. It must be a compound since it broke down into two substances


D. cannot be determined


15


A colorless, oderless gas combines with a magnetic element. What can you predict about the product?


A. It will also be magnetic


B. A gas and solid produce a liquid


C. The compound will be shiny and oderless


D. IT will likely have different properties, but they can't be predicted without more information.


#5


f 9.0g of water conatin 1.0g of hydrogen, what mass of oxygen is contained in 36g of water?

Homework helps pls.?
Shouldn't you be doing this yourself?


P.S. I would delete this question no one will answer. ☻☻☻☻
Reply:u actually think someone is going to answer?
Reply:hey thats cheating
Reply:you should just give up i did
Reply:holy F it really sucks to be you right now