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vesna_86 [32]
3 years ago
14

OMG HELP!!!! I SUCK AT SCIENCE

Chemistry
2 answers:
Mariana [72]3 years ago
7 0
The answer is B: phosphorous
Maksim231197 [3]3 years ago
6 0
Organism are made up of organic molecules consisting of carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus.

The answer is B.
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A scientist is examining a mixture of nitrogen, hydrogen, and ammonia. The individual pressures that are exerted by nitrogen and
Svetach [21]
Using Daltons Law which states that the total pressure of a gas mixture is the sum of the gasses partial pressure.Thus,

Pt(total pressure)= P1+P2+P3
where
Pt= 0.90 atm
P1= 0.26 atm
P2 = 0.28 atm
P3 = ?
substitute the formula with known variables
P3= 0.90 atm-(0.26atm+0.28atm)
P3 = 0.36 atm

The partial pressure of ammonia is 0.36 atm
6 0
3 years ago
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Define independent variable
GenaCL600 [577]
A variable that stands alone and isn't changed by the other variables you are trying to measure. For example, if you’re trying to see if drinking milk affects a persons height, then the independent variable is the milk, and the dependent variable is the persons height change
4 0
2 years ago
Which of the following is the closest to the observed abundance of 71Ga, one of two stable gallium isotopes (69Ga and 71Ga). The
Marina86 [1]
You must see the mass of Gallium in the periodic table. The mass present there is calculated by a weighted average of the mass of the isotopes, where the weights are the abundances of each isotope. Let X the isotopic abundance of Ga⁷¹. Since there are only Ga⁶⁹ and Ga⁷¹, the isotopic abundance of Ga⁶⁹ is 1-X. Then:

m(Ga)_{periodic~table}=(1-X)\cdot m(Ga^{69})+X\cdot m(Ga^{71})\\\\69.7=(1-X)\cdot69+X\cdot71\\\\ 69.723=69-69X+71X\\\\ 2X=0.723\\\\ X=0.3615\\\\ \boxed{X=36.15\%}

I don't know the options, but probably 40% is the closest to 36.15%.
7 0
3 years ago
A student uses red litmus paper to test the pH value of different solutions. Which would result in a color change of the litmus
OverLord2011 [107]
The answer is all of the above but fertilizer 
5 0
4 years ago
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How many significant digits are in this number: 0.0030670?
yarga [219]

Answer:

Answer:

Number of Significant Figures: 5

The Significant Figures are 3 0 6 7 0

Explanation:

hope this helps

6 0
3 years ago
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