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3 years ago

Reliable results are results that can be... A: communicated B: evaluated C: duplicated

Chemistry

2 answers:

TEA [102]3 years ago

5 0

I wanna say duplicated...because if you can repeat the same answer twice then its probably right

insens350 [35]3 years ago

4 0

Reliable results are results that can be... A: Communicated

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Give the nuclear symbol for the isotope of phosphorus for which a=31? enter the nuclear symbol for the isotope (e.g., 42he).

Bogdan [553]

A = number of mass = 31 => number of protons + number of neutrons = 31

Phosphours, Z = atomic number = 15 = number of protons

Symbol of the element phosphorus = P

=> The symbol of the isotope is the symbol of the element, P, with the number of mass, 31, to the left, as a superscript, and the atomic number, 15, to the left, as a suscript.

8 0

3 years ago

What is the distinction between magma and lava

lesya692 [45]

Answer:

Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth's surface.

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2 years ago

A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solutio

Alja [10]

Answer:

Concentration of original solution = 1.66

Explanation:

We know that

$H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O$

We have given concentration of NaOH = 0.1678

Volume of NaOH = 19.88 mL = 0.01988 L

So moles of NaOH = volume x concentration of NaOH

= $0.01988\times 0.1678=0.00333mole$

Moles of $H_2SO_4$ in 10 mL of diluted solution = 1/2 x moles of NaOH

= $\frac{1}{2}$ x 0.00333 = 0.00166 mol

Moles of $H_2SO_4$ in 25 mL of original solution

= moles of H2SO4 in 250 mL of diluted solution

= $\frac{250}{10}$ x 0.00166 = 0.0415 mol

Concentration of original solution = $\frac{moles}{volume}$

= $\frac{0.0415}{0.025}=1.66$

8 0

3 years ago

f 4.2 moles of copper metal react with 6.3 moles of silver nitrate, how many moles of silver metal can be formed, and how many m

alex41 [277]

<span>1. Balance the reaction
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
2. Find the limiting [divide moles of reactant by their balancing numbers]
Cu: 4.2/1 =4.2
AgNO3: 6.3/2= 3.15
AGNO3 is the limiting
How many moles of silver metal will be formed?
The ratio between the limiting reactant and silver is 2:2 or 1:1
therefore 6.3 moles of silver will be formed.

How many moles of excess reactant will be left?
Since each mole of copper is equal to 2 moles of AgNO3. divide 6.3 by 2 then minus it from coppers moles
6.3/2 = 3.15
4.2-3.15 = 1.05 moles of copper will be left
</span>

7 0

3 years ago

How many electrons does Rb1- have?

OLEGan [10]

Answer:

Explanation:

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5 0

3 years ago