Maths Group11

What is the electron configuration for magnesium(Mg) metal? Z = 12

In Niels Bohr's model of the atom, electrons are said to occupy specific energy levels or orbits around the nucleus. What is the primary feature of these orbits?

The number of electron in the atom always equal to atomic number.

Which one of the following radioactive radiation consists of high-energy rays?

The charge of electron was determined by using the oil drop experiment. It was determined by:

Who discovered the word atoms at the frist time?

The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21.0cs. The total mass of the train is 875 g. What is the average power delivered to the train during the acceleration?

An older model car accelerates from rest to speed v in 10 seconds. A newer, more powerful car accelerates from rest to 2v in the same time period. What is the ratio of the power of the newer car to that of the older car?

A car with a mass of 400 kg is traveling at a velocity of 20 m/s. What is the kinetic energy of the car?

If I _________ him, I would study hard.

By the end of this month we__________ our frist final exam.

What is the direction of flow of electrons in an electrolytic cell?

Given matrixA with 3 × 4 size, matrix B with 4 × 6 size and matrix C with 6 × 3 size. Then which of the following is multiplication of matrices impossible?

How many grams of sodium metal are needed to react with 10.0 g of water?

How many moles of HCl are present in 0.8 L of a 0.5 M HCl solution?