On the chemical equation of Na and the equation of compound containing Na Na containing compounds can appear on both the reactant side and the product side,

On the chemical equation of Na and the equation of compound containing Na Na containing compounds can appear on both the reactant side and the product side,

Na2O + H2O = 2naoh2na2o2 + 2H2O = 4naoh + O2 ↑ Na2O + SO3 = na2so4na2o + CO2 = Na2CO3 Na2O + 2HCl = 2nacl + h2o2na + H2 = 2nah4na + O2 = 2na2o2na22na + O2 = na2o22na + S = Na2S (explosion) 2Na + 2H2O = 2naoh + H2 ↑ 2Na + 2nh3 = 2nnh2 + H24

HCN o Na AI Si CI is a common liquid compound composed of these two atoms in the ratio of 1:1, which is easy to catalyze
The common liquid compounds of hcno Na AI Si Ci, which are composed of these two atoms in the ratio of 1:1, are easy to be catalytically decomposed. The catalyst that can be used is a MnO 2 B Feci 3 C Na 2SO 3 D KMnO 4

The compound is hydrogen peroxide and the catalyst is manganese dioxide
Choose a

Na, Mg, Al, Si, P, s write the chemical formula of the compound composed of two of the above elements

Na2S

The equation (K & # 178; - 1) x & # 178; + 9 (K + 1) x + (9K + 2) y = K + 3, when what is the value of K, the equation is one variable linear equation 0 and two variable linear equation?

It is a linear equation of one variable
(k²-1)=0
(K + 1) = 0, that is, k = - 1
It is a quadratic equation of two variables
9k+2=0
k=-2/9
Explanation: this question type is concerned about the coefficients in front of the unknowns

The known equation (k2-1) x2 + (K + 1) x + (k-7) y = K + 2=______ When k, the equation is linear=______ &The equation is a quadratic equation of two variables

Since the equation does not indicate whether it is about X or Y, we should refer to the equation of first degree with respect to X or y. when k2-1 = 0 and K + 1 = 0, the equation is the equation of first degree with respect to y, and the solution is k = - 1. When k2-1 = 0 and K + 1 ≠ 0, the equation is the equation of second degree with respect to y, and the solution is k = 1. So the answer is: - 1,1

Equation (k2-1) x2 + (K + 1) x + (K + 2) y = 9.1, equation is binary linear equation, find K; 2, equation is unitary linear equation, find K

1. When it is a quadratic equation of two variables: the original formula can get (K 2 - 1) x 2 = 0, K2 - 1 = 0, then k = 1 or K = - 1; the original equation requires a quadratic equation of two variables, then (K + 1) x is not equal to 0, that is to say, K + 1 is not equal, that is, K is not equal to - 1, so only k = 1;
2. When the equation is a linear equation of one variable: case 1 (y) requires (K2 - 1) = 0 and K + 1 = 0, the solution is k = - 1;
Case 2 (reservation x): it requires (K2 - 1) = 0 and K + 2 = 0
By synthesizing cases 1 and 2, it can be concluded that k = - 1 when the equation is a linear equation of one variable

A series of linear equations with two variables
A table consists of a table top and four legs. One cubic meter of wood can make 50 tables or 350 legs. There are 11 cubic meters of wood. How to distribute the wood? How many tables can the table top and legs match

Set X cubic meters as table top and Y cubic meters as table legs
x+y=11
4*50x=350y
The solution is x = 7
y=4
A: with 7 cubic meters as the table top and 4 cubic meters as the table legs, you can make 4 tables (because the number of tables is 7 * 50 = 350 and the number of table legs is 4 * 350)

Solving binary linear equations
x+y=90
50x+30y=3300
Urgent!!!
beg!!!
Konsumida!!!

x=30
y=60

From January to May 2010, a travel agency received 5000 tourists to Ningde World Geopark with Fuding Taimu mountain, Pingnan Baishuiyang and Fu'an Baiyun Mountain as the main scenic spots. This year's number increased by 40% over the same period of last year, including 50% for foreign tourists and 10% for local tourists?

In the same period last year, the number of foreign tourists was x, and the number of local tourists was y According to the meaning of the question, x + y = 5000 (1 + 50%) x + (1 + 10%) y = 5000 × (1 + 40%) The solution is x = 3750y = 1250 (9 points) a: from January to may last year, the travel agency received 3750 foreign tourists and 1250 local tourists (10 points)

To set up a system of linear equations of two variables
The existing cloth is 25 meters long, and it needs to be cut into two kinds of clothing for adults and children. It is known that adults use 2.4 meters of cloth for each set and children use 1 meter of cloth for each set. How many sets of cloth can be cut just to use up the cloth?

Let X and y be integers
2.4x+y=25
So y = 25-2.4x
Because X and y are integers, so
X = 5, y = 13 or x = 10, y = 1
That is to say, 5 sets for adults, 13 sets for children, or 10 sets for adults and 1 set for children