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dimulka [17.4K]
2 years ago
8

A sample was collected from a computer keyboard and a toilet seat using two separate cotton swabs. Then, each swab was wiped on

a petri dish and left to grow for 5 days.
*Which location had the most bacteria present? The computer keyboard or the toilet seat?

*What steps can you take to prevent the spread of bacteria in the office setting?
Chemistry
1 answer:
Gnom [1K]2 years ago
5 0

Answer:

toilet seat and washing of hands ✋ very well

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Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many liters of hydrogen gas ar
Studentka2010 [4]

Answer: 7.62L of Hydrogen

Explanation:Please see attachment for explanation

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3 years ago
Which of these is the balanced equation for this reaction?
Georgia [21]

Explanation:

This looks like a double-replacement reaction, and ALL YOU NEED TO DO is make sure that each element as the SAME AMOUNT on BOTH SIDES of the yield.

I am joyous to assist you anytime.

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Which cellular process allows a cell to make an exact copy of itself?
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Explanation:

the answer is letter A. mitosis

6 0
2 years ago
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Amount of moles in 3.34x10^34 formula units of Cu(OH)2
Naily [24]

 The amount of  moles in  3.34 x10³⁴  formula unit of Cu(OH)₂ is 5.55 × 10¹⁰  moles

  <u><em>calculation</em></u>

 The  amount  of  moles  is calculated  using  the Avogadro's  law   constant

That  is  1  moles =  6.02 × 10²³  formula units

                 ? moles = 3.34 × 10³⁴ formula  units

<em>by cross  multiplication</em>

= {1 mole  ×3.34 ×10³⁴  formula units ] / 6.02 × 10²³ formula units}  = 5.55 ×10¹⁰  moles


4 0
3 years ago
Why did it require two sodium atoms to complete the Na2O formula unit? Na has +2 charge and O has -1 charge. Na has +1 charge an
Artyom0805 [142]
Na₂O is an ionic compound. Na is in group 1 which means it has one electron in the outer shell. O is in group 6 so it has 6 electrons in the outer shell.
To become stable atoms need to either lose the electrons in the outer shell or gain electrons to gain a complete outer shell configuration. 
To become stable Na loses its outer electron and becomes positively charged. It only loses one electron, so net charge is +1. O to become stable gains 2 electrons to complete its outer shell and becomes negatively charged. since it gains 2 electrons, the net charge is -2. 
cation - Na⁺
anion - O²⁻
O gains 2 electrons but Na can give only one electron, therefore 2 Na⁺ ions are required. 
the compound can be written by exchanging the charges
  ions         Na⁺       O²⁻
charge       +1       -2
exchange   Na₂O
Correct answer is <span>Na has +1 charge and O has -2 charge</span>
5 0
3 years ago
Read 2 more answers
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