The chemical formula of oxygen is o2 that means it is a single compound or molecule gas? It is pure substance or mixture?

Calculate the missing variable M1 = ? V1 = 500mL M2 = 1.6 M V2 = 300mL

The atomic number of an element is equal to the number of protons in each atom of the element. All helium atoms have 2 protons. What is the atomic number of helium?

What kind of energy transformations occur when you hit a coconut with a hammer

Mei wants to study whether heart rate increases more during certain exercises than during others. She designs an experiment to test the heart rates of classmates in the morning and in the evening for three days, immediately after doing jumping

Which of the following are likely to form an ionic bond? • copper atoms • hydrogen atoms • hydrogen and oxygen atoms • copper and fluorine atoms

Which combination of protons neutrons and electrons is correct for the isotope of copper - 63?

What is the purpose of a domain?

What is the ideal gas constant? A. It is a constant that applies only at STP. B. It is a specific constant for a particular gas. C. It is a universal constant used for all gases. D. It is a constant that depends on the conditions.

The greenhouse effect is a result of the Sun's energy being absorbed by objects on the Earth and converted into which type of radiation? A) Radio B) Visible C) Infrared D) Ultraviolet

Which was the limiting reactant: the zinc or the hydrochloric acid? Remember that the limiting reactant is completely consumed in a reaction and no new product is formed unless more of the limiting reactant is added.