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azamat
3 years ago
9

A student can hold her breath for 94 seconds if another student records that the time she can hold her breath is 92 seconds, wha

t is the percent error in this measurement?
Chemistry
1 answer:
Studentka2010 [4]3 years ago
6 0

Answer:  -2.13%

Explanation:

I will assume that the correct time is 94 seconds, since it is stated as a fact.  The measured time of 92 seconds is -2 seonds from the actual.  That gives a percent error of:

[(Measured-Actual)/Actual] or (-2/94) or -2.13%

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How did Dalton describe the relationship between atoms and elements? An element is made up of one kind of atom. Atoms are made u
victus00 [196]

Answer: An element os made up of one kind of atom.

Explanation: Dalton's concept states that all atoms of an element is identical.

5 0
3 years ago
Read 2 more answers
Suppose you made 40 atoms of Highlinium and it has a
Karo-lina-s [1.5K]

Answer:

After 6sec 5 atoms will be left.

Explanation:

Given data:

Total atoms of Highlinium = 40

Half life = 2 sec

Atoms left after 6sec = ?

Solution:

First of all we will calculate the number of half lives passes during 6sec.

Number of half lives = Time elapsed/ half life

Number of half lives = 6 sec / 2sec

Number of half lives = 3

Now we will calculate the number of atoms left

At time zero = 40 atoms

At 1st half life = 40 atoms/2 = 20 atoms

At 2nd half life = 20 atoms/2 = 10 atoms

At 3rd half life = 10 atoms / 2 = 5 atoms

Thus, after 6sec 5 atoms will be left.

6 0
3 years ago
A set of aqueous solutions are prepared containing different acids at the same concentration: acetic acid, chloric acid and hydr
navik [9.2K]

Answer:

The solutions of hydrobromic acid and of chloric acid are the most electrically conductive.

Explanation:

The electrical conductivity of a solution is determined by the concentration of ions in the solution. The acids listed react with water to form ions. In the case of hydrobromic acid, for example, the reaction is as follows:

HBr + H2O >> H3O(+) + Br(-)

Hydrobromic acid and chloric acid are strong acids, meaning the reaction is considered to proceed at 100%. Acetic acid, however, is a weak acid and the reaction with water does not go to completion, so there are less ionic species in the solution of acetic acid, which makes it less electrically conductive.

3 0
3 years ago
Combustion reactions are a notable source of carbon dioxide in the environment. Using the following balanced equation, how many
iris [78.8K]

Answer:

Explanation:

Number of moles of propane:

=Mass in grams ÷ Relative molecular Mass

= 100/((12*3) + (1*8))

= 100 ÷ 44

= 2.2727

Mole ratio propane:carbon (IV) oxide = 1:3(from the equation)

Number of moles of CO2 = 3*2.2727 = 6.8181

Mass in grams = Relative molecular Mass * Number of moles

= 44 * 6.8181

= 299.9964 grams

8 0
4 years ago
Models need to be changed when _______.
dedylja [7]
B. When scientific understanding changes. 
8 0
3 years ago
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