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3 years ago

A lens is used in a magnifying glass.

1 answer:

6 0

Answer: A magnifying glass uses a convex lens, which is a converging lens to produce an image. The image produced is upright, magnified and virtual as long as the object is at or within the focal length of the lens.

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A sample of helium has a volume of 50.00 L at STP. How many helium atoms are in the sample? Show work

Setler79 [48]

Answer:

Explanation:

molar volume at STP=22.4 L

given volume=50.0 L

number of moles=given volume/molar volume

number of moles=50.0/22.4

number of moles=2.2

1 mole of helium =6.023*10^23 atoms

2.2 moles of helium =6.023*10^23*2.2=1.3*10^24

therefore 50.0 L of helium contain 1.33*10^24 atoms

4 0

2 years ago

How would the world be different if people were not aware of radioactive decay

allsm [11]

Answer:

everyone would die

Explanation:

if we did not know about it we would not do anything about it

6 0

2 years ago

What does variable mean in a science project.

Paul [167]

Well, an independent variable ids the thing that stays the same and a dependent variable is the thing that changes.

6 0

3 years ago

Read 2 more answers

What information does the percent composition of an atom in a molecule

max2010maxim [7]

This is basically the definition of percent composition which is how much mass a element contributes to a specific molecule.

7 0

3 years ago

For the reaction between aqueous solutions of acetic acid (CH3COOH) and barium hydroxide, Ba(OH)2, write

borishaifa [10]

Answer:

See explanation.

Explanation:

Hello!

In this case, since we are asked to note down the complete molecular equation, complete ionic equation and the net ionic equation for the reaction between acetic acid (weak acid) and barium hydroxide (strong base), we proceed as shown below:

- Complete molecular equation:

$2CH_3COOH(aq)+Ba(OH)_2(aq)\rightarrow Ba(CH_3COO)_2(aq)+2H_2O(l)$

- Complete ionic equation: in this case, since acetic acid is a weak one, it is not ionized, so we do this:

$2CH_3COOH(aq)+Ba^{2+}(aq)+2OH^-(aq)\rightarrow Ba^{2+}(aq)+2CH_3COO^-(aq)+2H_2O(l)$

- Net ionic equation: in this case, we cancel out the barium ions as they are the spectators one because they are present at both reactants and products:

$2CH_3COOH(aq)+2OH^-(aq)\rightarrow 2CH_3COO^-(aq)+2H_2O(l)\\\\CH_3COOH(aq)+OH^-(aq)\rightarrow CH_3COO^-(aq)+H_2O(l)$

Best regards!

3 0

2 years ago