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The no. of millimoles of HCl required to neutralize 10 ml of 0.2 M Na2CO3 is

(a) 2.0 m mole

(b) 4.0 m mole

(c) 0.2 m mole

(d) 0.4 m mole

Determine the mechanical energy of this object: a 1-kg ball sits on a 10-meter high cliff. a. 98 J b. 10 J c. 980 J d. The ball isn't moving, so the mechanical energy is zero.

A boy jumps into a cold swimming pool and his body temperature goes down. His muscles, blood vessels, and nervous system work together to restore his body temperature.

Which of the following methods for increasing the rate of chemical reaction increases the effectiveness of the interactions between reactants, instead of just causing the reactant molecules to bump into each other more frequently Increasing the

In the nitrogen cycle, bacteria combine nitrogen gas with hydrogen to form ammonia in a process called

In the chemical formula for ammonia, NH3, what does the subscript 3 represent?

The ideal gas law shows us how a gas will behave under many conditions. The formula is: P V = n R T Where P = pressure, V = volume, n = amount of the substance, R = ideal gas constant, and T = temperature.

The Suns ultraviolent Rays can cause skin damage including sunburn and even skin

Peas contain 250 kJ per 100 g. You would use the equivalent of 600 g of peas if you slept for.

A sample of gas in a balloon has an initial temperature of 21 ∘C and a volume of 1310 L. If the temperature changes to 70 ∘C, and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?

Which is a waste product of aerobic respiration? A. water B. energy C. oxygen D. glucose