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Wewaii [24]
3 years ago
9

Which part of scientific design occurs when an experiment is conducted by more than one scientist to determine the validity of r

esults?
A. replication
B. research
C. trials
D. variables
Chemistry
1 answer:
statuscvo [17]3 years ago
8 0

Answer: c

Explanation:

i think the answer is c

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I think the answer is boiling

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In order to reduce the exposure to organic solvents like turpentine, some art instructors recommend the students clean brushes a
kykrilka [37]
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3 years ago
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6 0
2 years ago
In a 71.4 g sample of nahco 3 3 ​ , how many grams of sodium are present?
sweet [91]

There are 19.5 g Na in 71.4 g NaHCO₃

Calculate the <em>molecular mass of NaHCO₃</em>.

1 Na = 1 × 22.99 u = 22.99   u

1 H   = 1 × 1.008 u =    1.008 u

1 C   = 1 × 12.01  u =  12.01    u

3 O = 3 × 16.00 u =  <u>48.00  u </u>

               TOTAL =  84.008 u

So, there are 22.99 g of Na in 84.008 g NaHCO₃.

∴ Mass of Na = 71.4 g NaHCO₃ × (22.99 g Na/84.008 g NaHCO₃) = 19.5 g Na

4 0
3 years ago
How do you determine the chemical reactivity for metals using the periodic table?
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- and the chemical reactivity decreases as we go across the period because they want to give away valence electrons, they need more energy to get rid of them.
8 0
3 years ago
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