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loris [4]
3 years ago
15

What part of the scientific method involves controlling variables while testing a hypothesis

Chemistry
1 answer:
Minchanka [31]3 years ago
5 0

Answer:

<em>Making observation</em>

Explanation:

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A first-order reaction has a half-life of 20.0 minutes. Starting with 1.00 x 10^20 molecules
blsea [12.9K]

Answer:

E

Explanation:

100 minutes is   5 half lives  ( 100 min/20 min/half life)

         = (1/2 )^5

1 x 10^20    *    (1/2)^5 =   3.125 x10^18   molecules

7 0
2 years ago
What valence electron number do they all have in common
katovenus [111]
If they are in the same group they have the same valence electrons but since I cannot see what you’re talking about I’m not sure what your question is
5 0
3 years ago
Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H20
LenaWriter [7]

Answer:

A. 1350

You multiply 18.21HNO3* 1mol MgN2O6 * 148.30MgN2O6

Then divide it by the 2mol HNO3 to get 1350

3 0
3 years ago
How many oxygen molecules are in 5.17g of oxygen gas​
Alex787 [66]

Answer:

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4 0
3 years ago
Gold is currently trading at very high price. Suppose that gold is selling for around $1860/ounce. How
Ugo [173]

Answer:

The answer is "3.81041978"

Explanation:

\to 1 \ OZ= 28.349523125 \ grams\\\\

              =28.349523125\times {1000} \ miligrams\\\\= 28349. 5231  \ miligrams\\

In 1860 = 28349.5231 \ miligrams\\

\to In \$ \ 1 = \frac{28349.5231}{1860} \ \ miligrams\\

             = 15.2416791 \ miligrams

\ In \  1 \ quarter =  \$ \ 0.25

\to \$ \ 0.25 =  15.2416791  \times 0.25 \  miligrams\\

              = 3.81041978

3 0
3 years ago
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