WM "Please write the molecular formula for the following by criss cross method. 1. Calcium nitrate 2. Sodium bicarbonate 3. Magnesium nitrite 4. Sodium chloride 5. Hydrogen sulphate 6. Hydrogen chloride T-Aluminium bisulphate 8 Aluminium chloride 9. Aluminium sulphate 10. Hydrogen Nitrate
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Ответ:
1 Ca(NO3)2
Calcium- Ca, Valency 2
Nitrate- NO3, Valency 1
AFTER CRISS CROSS:
Ca1(NO3)2
Ca(NO3)2
2 sodium bicarbonate = NaHCO3
Na = Sodium = (Na)+
HCO3 = bicarbonate = (HCO3) -
Na HCO3
3 magnesium nitrite
+2 _ 1
Mg2(NO3)2
4 Na Cl
+1 _1
formula NaCl
5 hydrogen sulphide
H SO4
+1 _2
formula H2SO4
6 H Cl
+1 _1
HCl
7 AL2 HSO4
+2 -2
AL2(HSO4)3
8 NH4 Cl
+1 _1
NH4Cl
9 NH4 SO4
+1 _2
(NH3)2SO4
10 H NO3
+1 _1
HNO3
Ответ:
Part a) The equation in point slope form is![y-11.2=-0.025(x-37)](/tpl/images/0356/6234/1e6aa.png)
Part b)![6.1\ in](/tpl/images/0356/6234/c8d56.png)
Step-by-step explanation:
Part a) Determine the equation of the line in point slope form
Let
x -----> the time in minutes
y -----> the height of the candle in inches
we know that
After 37 minutes, the candle was 11.2 inches tall
so
we have the point
(37,11.2)
Eighteen minutes later, it was 10.75 inches tall
so
we have the point
(37+18,10.75) -----> (55,10.75)
Find the slope of the linear equation
The formula to calculate the slope between two points is equal to
substitute the values
The equation of the line in point slope form is equal to
we have
substitute
Part b) Determine the height of the candle after 4 hours
Remember that
so
For x=240 min
substitute in the linear equation
Round to the tenth place