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bearhunter [10]

3 years ago

15

What is the chemical agent mixed with feces to determine if blood is present

2 answers:

77julia77 [94]3 years ago

6 0

Luminol is a chemical when mixed with hydrogen peroxide is sprayed on blood

gogolik [260]3 years ago

4 0

The chemical agent mixed with feces to determine if blood is present is Luminol.

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Of metals and nonmetals which tend to be positive ions

MA_775_DIABLO [31]

Answer:

metal atoms lose electrons to form positive ions (cations)

Explanation:

metal atoms lose electrons to form positive ions (cations ) non-metal atoms gain electrons to form negative ions (anions )

5 0

3 years ago

Atomic numbers of atoms of elements _____ as you read _____ along each row of the periodic table of the elements.

serious [3.7K]

The periodic table increases as you read left to right so it is A.

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3 years ago

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which two will help you measure how different colors absorb the energy in sunlight is it beaker or thermometer

KATRIN_1 [288]

Beaker does thermometer measures the thermal energy in the air

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3 years ago

do you agree or not that evidence is only used to back scientific laws and provide evidence why or why not!!!!!! thank you, will

suter [353]

Answer:

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Explanation:

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4 0

3 years ago

Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%, respectively)

Reika [66]

Answer:

Average atomic mass = 79.9034 amu

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

<u>For first isotope: </u>

% = 50.69 %

Mass = 78.9183 amu

<u>For second isotope: </u>

% = 49.31 %

Mass = 80.9163 amu

Thus,

$Average\ atomic\ mass=\frac{50.69}{100}\times {78.9183}+\frac{49.31}{100}\times {80.9163}\ amu$

$Average\ atomic\ mass=40.0036+39.8998\ amu$

<u>Average atomic mass = 79.9034 amu</u>

4 0

3 years ago