Answer:
Empirical formula
Explanation:
Castle learning
Answer: A balance is used to determine accurate mass of substances.
Explanation: Electronic balance is used to measure the small to large mass of substance from miligrams to grams to kilograms according to their features. Differnt different Electronic balances are used on the basis of amount to be measure.
In pharmaceuticals , other laboratories , schools , colleges mainly electronic balance is used , as it measure accurate weight of the substances.
spontaneous
combustion
endothermic
Answer: Option (d) is the correct answer.
Explanation:
A reaction in which heat is absorbed by the substance or reactant molecules is known as an endothermic reaction. In this process energy of reactants is less than the energy of products.
Whereas a reaction in which heat is released by the substance or reactant molecules is known as an exothermic reaction. In this process energy of reactants is more than the energy of products.
For example, when ice is warmed then heat is absorbed by ice molecules due to which there occurs decrease in its intermolecular forces. As a result, ice changes into water.
Therefore, we can conclude that if ice is warmed and becomes a liquid, then it is an endothermic process.
Answer:
The area is 2.5 m²
Explanation:
Step 1: Data given
A car has a 25 m² hydraulic lift platform that weighs 15000 N
The smaller piston required a force to lift = 1/100 its weight
Step 2: Calculate the area of the smaller piston
Pressure = Force / Area
F1 / A1 = F2 / A2
⇒ with F1 = weight of the hydraulic lift = 15000 N
⇒ with A1 = area of the hydraulic lift = 25 m²
⇒ with F2 = 1/100 of it's weight = 1500 N
A2 = F2 / (F1/A1)
A2 = 1500 ( 1500/25)
A2 = 2.5
The area is 2.5 m²