Describe the ways you can know that a chemical reaction has occured

Em 150 gramas de alumínio, quantos átomos deste elemento estão presentes? Dados:MM (AI) = 27 gmol-¹ Número de avogadro = 6,02 x 10²³

One of the first properties you notice about an unknown mineral, and one of the least reliable in terms of identification, is which of the following? a. color b. streak c. hardness d. luster

Why do oxygen molecules have a double bond with carbon?

As the ball falls, its energy will decrease and its energy will increase

When an isotope emits an alpha particle, its atomic number , and its mass number A is reduced by 2, is reduced by 4 B is reduced by 4 is reduced by 2 C stays the same, is reduced by 4 D is increased by 1, stays the same

A woman carriers her 100-newton child for a distance of 50 meters to the child's bedroom. How much work does the woman do?

Which statement best describes the compressibility of a gas? A Increasing the temperature of a gas decreases the pressure. B Increasing the temperature of a gas increases the pressure. C Increasing the pressure on a gas decreases the volume.

How many grams are in 3.0 moles of KCI (potassium chloride) ?

3 During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when electrons in excited lithium atoms (1) are lost by the atoms (2) are gained by the atoms (3) return to lower energy states within the atoms

Select the answers below that represent the ionic compounds in this list: na2so4 h2so4 ch3-ch3 n2o4 cacl2 ca3 (po4) 2