Witch substance is a combination of different atoms

A - homogeneous mixture

B - heterogenous mixture

C - element

D - compound

Since no electromagnetic radiation escapes from astronomers locate them by looking for x-rays from gas accelerating toward them

Is 2H + O2 →2H2O a balanced chemical equation? Is it obeying the law of conservation of matter? No, the equation is not balanced. Neither the Hydrogen (H) nor the Oxygen (O) are balanced. No, the equation is not balanced.

Describe 4 real life examples of scientific inquiry

What is the mass in grams of 1 liter of nitrogen gas?

Why do North and South Pole have different winter times?

Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.