Junior 3 Mathematics Chemistry Problems, Junior 3 Chemistry Mathematics Problems

Idea: "10g of this gas mixture" cannot be used in chemical equations. Start with "15g white precipitate".

Solution: Let the generation of CaCO3 (i.e., 15g of white precipitate) react XGCo2CO2 + Ca(OH)2=CaCO3{precipitation symbol} + H2OX 15g to obtain x=

mco=m-total-mco2=

Answer:..

co2+ca(oh)2=caco3+h2o

x 15 solves: x=

Then the quality of the CO is.

CO2 = 15 Calcium carbonate molecular weight 100 times carbon dioxide molecular weight 44 = co=

CO does not react with Ca(OH)2...

Solution: Let CO2 have xg.

co2+ca(oh)2=caco3+h2ox 1544/x=100/15

x=so:mco=

Answer:..

1.The main ingredient of vinegar is acetic acid, and there are a variety of ingredients, as well as water, which is a mixture, and soy sauce is a mixture.

Iodized salt is table salt plus iodine-containing compounds that are a mixture of sucrose purity.

2 -16x doesn't have to be negative! When x is less than or equal to 0, -16x 0 can be squared.

So x must o answer 4x times the root number x3 under the root number a squared out is always the absolute value of a = absolute value 1 - root number 3

1 - root number 3 0

The original formula is equal to the root number 3-1

Hello 1Because sucrose is pure, everything else is a mixture.

2.(incomprehensible).

3..(incomprehensible).

The first organic and inorganic matter.

The second one, first of all, is a positive number under the root number, so x is a negative number, so the answer should be -4x under the root number, and -x under the root number

The third simple point is to treat the root number 3 as a, which is simplified to 1-2a+a squared, and bring in 1-2 times the root number 3 + 3 = 4-2 times the root number 3

1.The first three are mixtures, and sucrose is pure.

2.The answer is 4x root number under -x. x is definitely negative.

3.The answer is root number 3-1 because root number 3 is greater than 1

1, sucrose, because sucrose is pure, and everything else is a mixture 2, to -16x to make sense, -16x 0 so x 0 But if it is inferred from the answer, to make the answer make sense x 0, bring it into -16x, -16x 0, so it is very likely that the answer is wrong (if the answer is not wrong, then I don't understand).

3, because ( (1- 3) ) is equal to |1-√3|, which is equal to 3-1

I only know the third.

Because 1-root number 3 is less than zero, its square is -(1-root number 3) is root number three minus one.

A (personal opinion):

1: Vinegar, iodized salt, and soy sauce are all mixtures, while sucrose is pure.

2: This question should default to the negative number x, so that the square of x is -x,

1. Sucrose is pure, and the others are mixtures.

Because sucrose is an organic substance, the other three are inorganic.

1.Conservation according to mass. 3G A reacts exactly exactly with 5G B to produce 6G D and 2G C at the same time. So, if you generate 8G C, you need A 12G, B 20G, and D 24G.

2o2 ==fe3o4

==Rhizobia ==== 4 NH3 + 3CO2 ===N2 +2CO2

5.The gas is CO2 and H2O2 and there is no iron in the reactive substance, so it cannot be iron or iron oxide.

6.Since it is a quadratic equation, then there must be a quadratic term. So m2-2 is not equal to 0Then m is not equal to positive and negative root number 2

1) B2)3Fe+2O2=Fe3O4 (ignition) 3)2N2+6H2O+3C=4NH3+3CO24)NO+CO=N2+CO2

5] The CO2 conjecture is unfounded: 1. C is heated to produce carbon dioxide.

Math: You don't understand the number you give, or find how many m x is

Because the equation is quadratic, m2-2 cannot be equal to 0So m is not equal to plus or minus root number 2