|Question 1 |
The above drawings contain microscopic representations of small samples of three different substances. Which of these images represent a pure chemical compound?
The open circles represent atoms of type A. The solid circles represent atoms of type B.
|Question 2 |
Which substance has a high melting point, a high boiling point, conducts electricity when melted and when dissolved in water, but does not conduct as a solid?
|Question 3 |
This chemical equation is NOT balanced
Al + HCl → AlCl3 + H2
When balanced the coefficient of H2 is:
|Question 4 |
The following drawing contain a microscopic representation of a mixture of hydrogen H2() and oxygen O2 () in a closed flask.
If these substances react according to the following chemical equation
2H2 + O2 à 2H2Owhich of the following images best represents the content of the flask at the end of the reaction?
|Question 5 |
14. What is the mass percent of iron in iron(II) oxalate, FeC2O4?
A compound contains 43.64% P with the remainder being oxygen. What is the empirical formula of the compound?
According to the chemical equation,
4Fe(s) + 3O2(g) à 2Fe2O3(s),
what is the maximum number of grams of Fe2O3 that can be produced from 5.0 g Fe and an excess of O2?
|Question 8 ||(|
Which of these is a non polar molecule?
|Question 9 |
Which of these solids is likely to be least soluble in water?
Which of the following compound is likely to be insoluble in water: Na2CO3, ZnS, KOH, and NH4Cl?
What is the net ionic equation for the reaction below?
AgNO3(aq) + KBr(aq) ® AgBr(s) + KNO3(aq)
What is the oxidation number of nitrogen in N2O3?
|Question 13 |
All of the following chemical equations represent oxidation-reduction reactions EXCEPT:
|Question 14 |
A chemist needs 0.050 g of substance A to complete a reaction. If she has a solution with a concentration of 0.25 g/L, how many liters of this solution does she need to add?
3..on balancing we will get cofficient of H2 as 3.
Al by 2.....HCl by 6 AlCl3 by 2 and H2 by 3....got balanced
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