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valina [46]
3 years ago
8

Why do you think scientists claim to offer only supporting evidence for a theory and not proof?

Chemistry
1 answer:
larisa [96]3 years ago
8 0
Because they're not confident enough to confirm it's indeed true but they will support it for they believe it's correct.
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Some elementary particles are positively or negatively
vodomira [7]
Hello there.
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Some elementary particles are positively or negatively 
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b. charged particles. 
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8 0
3 years ago
Phosphate buffers are commonly used in biological research. If a small amount of strong acid is added to a buffer solution that
lozanna [386]

Answer:

A) [H3PO4] will increase, [KH2PO4] will decrease, and pH will slightly decrease.

Explanation:

A buffer is a solution which resists changes to its pH when a small amount of acid or base is added to it.

Buffers consist of a weak acid (HA) and its conjugate base (A–) or a weak base and its conjugate acid. Weak acids and bases do not completely dissociate in water, and instead exist in solution as an equilibrium of dissociated and undissociated species. When a small quantity of a strong acid is added to a buffer solution, the conjugate base, A-, reacts with the hydrogen ions from the added acid to form the weak acid and a salt thereby removing the extra hydrogen ions from the solution and keeping the pH of the solution fairly constant. On the other hand, if a small quantity of a strong base is added to the buffer solution, the weak acid dissociates further to release hydrogen ions which then react with the hydroxide ions of the added base to form water and the conjugate base.

For example, if a small amount of strong acid is added to a buffer solution that is 0.700 M H3PO4 and 0.700 M KH2PO4, the following reaction is obtained:

KH₂PO₄ + H+ ----> K+ + H₃PO₄

Therefore, [H₃PO₄] will increase, [KH₂PO₄] will decrease, and pH will slightly decrease.:

4 0
3 years ago
How many moles of I2 will form 3.58 g of NI3?
Mila [183]

1.       The balanced chemical reaction is:

 

N2 +3 I2 = 2NI3

 

We are given the amount of product formed. This will be the starting point of our calculations.

 

3.58 g NI3 ( 1 mol NI3 / 394.71 g NI3 ) ( 3 mol I2 / 2 mol NI3 ) = 0.014 mol I2.

 

Thus, 0.014 mol of I2 is needed to form the given amount of NI3.

6 0
3 years ago
A chemical reactions occurs when, _____?
bixtya [17]

Answer:

Reactants are transformed into products

Explanation:

Chemical reactions are happening everywhere, it may be represented by the following equation:

A(aq) + B(s) ⇒ C(g) + D(l)

The left side represent the reactants that interact to get the products.

In the parenthetycal note is the state of the compound, in this case, aquose solution (aq), solid (s), gas (g), liquid (l)

7 0
3 years ago
What Period would this element be in?
AlladinOne [14]

Answer:

Period 2

Explanation:

From the picture provided, I am guessing this is Fluorine. Normal Fluorine has 9 protons, electrons, and atomic number. Thus, it can be found in the second period.

***Period # = # of electron shells

5 0
3 years ago
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