Answer:
B.
Explanation:
Because when a pistol is fired, chemical changes happen to light the gunpowder or whatever substance to create the noise or effect.
Answer:
B. 4 ham slices
Explanation:
A chemical reaction involves one or more substances known as reactants combining chemically to give one or more substances known as products.
Reactants in chemical reactions combine in definite mole or mass ratios to give products. Therefore, when one substance is present in excess of what is required to combine with another to form products, that substance is known as the excess reagent. The other substance which is present in a smaller amount and which when used up, the reaction stops is known as the limiting reagent.
From the illustration of the sandwiches in the question, the recipe for one sandwich represents the chemical equation of a reaction. The equation form is given below:
2 cheese slices + 1 ham slice + 2 bread slices ---> 1 sandwich
The ratio of the reactant is 2 : 1 : 2
From the available ingredients, 12 cheese slices, 10 ham slices, 12 bread slices.
12 cheese slices will require 6 ham slices and 12 bread slices to produce 6 sandwiches.
However, since there are 10 ham slices, 4 ham slices will be left over unused. This is the excess or leftover reactant.
Answer:
AINO3 - 89 g/mol
Explanation:
Molar mass of a compound or molecule is obtained by summing the individual atomic masses of the elements that makes the compound.
In this question, the elements are Al, N and O
The molar mass is given as;
Molar mass = Al + N + 3 (O)
Al = 27
N = 14
O = 16
Molar mass = 27 + 14 + 3(16)
Molar mass = 89 g/mol
Answer:
heat must be supplied to the system at a rate of 6670.22 KJ/h
Explanation:
m = 8390 g/h * ( Kg / 1000g )
⇒ m = 8.39 Kg/h
P1 = P2 = 6,20 atm.......... constant pressure
T1 = 24°C = 297 K
T2 = 337.0°C = 610 K
⇒ ΔT = 610 - 297 = 313 K
Q = ?
starting from first law at constant pressure:
∴ Cp (24°C) = 2,54 KJ / Kg°K.......engineering toolbox CH3OH
⇒ Q = ( 8.39 Kg/h ) * ( 2.54 KJ / Kg K ) * ( 313 K )
⇒ Q = 6670.22 KJ/h
