Answer:
Matter has mass and takes up space.
Explanation:
Matter is everything around you. Atoms and compounds are all made of very small parts of matter.
Mass is a measure of the amount of matter in an object.
Answer : The correct option is, 3.75 mole
Explanation : Given,
Moles of = 2.5 mol
The balanced chemical equation is:
From the balanced reaction we conclude that
As, 2 moles of produce from 3 moles of
So, 2.5 moles of produce from moles of
Therefore, the moles of initially present was, 3.75 moles.
Answer:
The moment magnitude scale is a scale that rates earthquakes by estimating the total energy released by an earthquake . Estimating the total amount of energy released, enables comparison of earthquakes more accurately.
Answer:
a) 210 mL of 95% ethanol
b) 75 mL of water
Explanation:
a) We can use the dilution equation to solve this problem. C₁ and V₁ are the concentration and volume of the stock solution, respectively, while C₂ and V₂ are the concentration and volume of the diluted solution.
C₁V₁ = C₂V₂
We want to find V₁, the volume of ethanol stock we need to dilute to prepare the final solution:
V₁ = (C₂V₂) / C₁
The concentrations are represented in percentages. We substitute in the known values to calculate V₁. The units cancel to leave us with units of mL.
V₁ = (C₂V₂) / C₁ = (70%)(285mL) / (95%) = 210 mL
b) The final solution volume is 285 mL and we have added 210 mL of ethanol, so the remaining volume is from the water that we add:
(285 mL - 210 mL) = 75 mL
Answer:
neutron, has no charge