Rare earth metals are a group of 17 elements - lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium - that appear in low concentrations in the ground
Answer:
3 protons and also 3 electrons
Explanation:
z=p=e
The molarity of the diluted solution is 2.36M
M₁L₁ = M₂L₂
M₂ = M₁L₁/L₂
M₂ = (5.00 M x 0.850 L)/ 1.80 L
M₂ = 2.36 M Cu(NO₃)₂
<h3>Molarity </h3>
The volume of a material present in a given volume of solution is known as its molarity (M). The number of moles of a solute in a liter of solution is referred to as molarity. The term "molarity" can also refer to a solution's molar concentration. Molarity (M) is the number of moles of a solute per liter of a solution, also referred to as the molar concentration of a solution. The symbols mol/L or, more commonly, M can be used to represent molarity. The word "molar concentration" refers to the amount of a substance per unit volume of solution and is used to describe the concentration of a chemical species, specifically a solute, in a solution. Molarity, amount, and substance concentration are other names for this term.
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Answer:
Heat energy is transferred to cooler objects to reduce the temperature of those objects.
Explanation:
The fourth option is not correct.
A correct way of writing it would be : " Heat energy is transferred from cooler objects to reduce the temperature of those objects.". When an object loses heat energy, its temperature reduces. Conversely, when an object receives heat energy, its temperature increases.