Which part of an of the helium atom is positively charged

Is spoiling food a physical or chemical change

In a particular gravimetric analysis, the precipitate of caso4 was weighed before it was completely dried. the likely impact of this error on the calculated moles of caso4 will be:

Whose cell walls may contain cellulose can be plantlike, animal like or fungus

Identify the limiting and excess reactants when 1.00 g of zinc reacts with 150 mL of 0.250M Pb (NO3) 2. How many grams of lead are formed in this single replacement reaction

Which of these molecular electron configurations describe an excited state?

2) Which of the following is a true statement? A: All the atoms of an element must be identical. B: Compounds may be separated by physical means. C: Mixtures may not be separated. D: Homogeneous is one type of compound.

How to tell the difference between ionic and covalent bonding?

The combustion of propane may be described by the chemical equation C3H8 (g) + 5O2 (g) ⟶3CO2 (g) + 4H2O (g) C3H8 (g) + 5O2 (g) ⟶3CO2 (g) + 4H2O (g) How many grams of O2 (g) O2 (g) are needed to completely burn 83.3 g C3H8 (g) ?

Was the relationship among temperature, heat, and thermal energy?

What will most likely happen when a warmer air mass exists above a polar ice sheet? The temperature of the ice sheet will be lowered. Heat will be transferred from the air mass to the ice. The air mass will exert high pressure and rise upwards.