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just olya [345]
2 years ago
14

A calcium atom has 20 protons, 20 electrons, and 20 neutrons. When calcium forms a positive two ion it's new composition is

Chemistry
1 answer:
miss Akunina [59]2 years ago
6 0

Answer:

40

Explanation:

I'm not sure

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Theories are used to make predictions true or false
Viktor [21]

Answer:

True

Explanation:

Theories are ideas which are used to make predictions

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3 years ago
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The probability that a person has immunity to a particular disease is 0.6. Find the mean number who have
gogolik [260]

Answer:

20

Explanation:

12 divide by 0.6 equal to 20 mean

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Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH
weeeeeb [17]

Answer:1)1.99 M

Explanation:

Molarity  is given as = moles solute/Liter solution

The solute which is LiOH is already given in moles as 1.495 moles

Given that solution  is  750 mL,  we convert to liters.

Liters of the solution=  mL of the solution   x (1 L/1000 mL)

750 mL x (1 L/1000 mL)

0.75 L

Molarity = moles solute/Liter solution

Molarity = 1.495 moles of LiOH/0.75 L of solution

Molarity = 1.99M

The molarity of this solution is 1.99M (moles per liter).

5 0
3 years ago
Object A has a mass of 12g and a volume of 8cm3. object B has a mass of 20g and a volume of 8cm3 . which object has a greater de
Charra [1.4K]

Answer:

Object B has a density of 2.5 g/cm³ which is greater than object A by 1 g/cm³

Explanation:

Since we know that the formula for density is d=m/v, we can divide each mass by its corresponding volume to find the densities

12/8=1.5

20/8=2.5

So we know that object B has a greater density than object A by 1 g/cm³ (gram per cubic centimeter). Also the standard unit for density is kilograms per cubic meter but I used gram per cubic centimeter since they were the given units. 1cm=100m, 1000g=1km

3 0
4 years ago
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