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Tamiku [17]
3 years ago
11

Democritus contributed to our understanding of the atom in which of the following ways?

Chemistry
2 answers:
Marianna [84]3 years ago
7 0
I believe the answer is 3 - He hypothesized that all substances can be broken down into a smallest part called the atom. 
Novosadov [1.4K]3 years ago
5 0

Answer:

He hypothesized that all substances can be broken down into a smallest part called the atom.

Explanation:

done the topic

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If a buffer solution is 0.250 M 0.250 M in a weak base ( K b = 8.0 × 10 − 5 ) Kb=8.0×10−5) and 0.540 M 0.540 M in its conjugate
Kaylis [27]

Answer:

9.57

Explanation:

Given that:

pK_{b}=-\log\ K_{b}=-\log(8.0\times 10^{-5})=4.1

Considering the Henderson- Hasselbalch equation for the calculation of the pOH of the basic buffer solution as:

pOH=pK_b+log\frac{[conjugate\ acid]}{[base]}

So,  

pOH=4.1+\log\frac{0.540}{0.250}=4.43

pH + pOH = 14  

So, pH = 14 - 4.43 = 9.57

8 0
3 years ago
A dangerous condition in a nuclear reactor when fuel rods melt is called
Gnesinka [82]

Answer:

A dangerous condition in a nuclear reactor when fuel rods melt is called NUCLEAR MELTDOWN

4 0
3 years ago
5. The reaction A - C is shown in the diagram below. Is the reaction exothermic or
velikii [3]

Answer:

Exothermic reaction.

Explanation:

From the question given, we obtained the following:

The equation for the reaction:

A —> C

From the diagram given in the question above, the reactant, A has a higher energy than the product, C. This simply indicates exothermic reaction as the enthalphy change, ΔH will be negative for the reaction.

Enthalpy change, ΔH is simply the difference between the heat of product, Hp and the heat of reactant, Hr i.e

ΔH = Hp – Hr

Since the heat of the product is small, the enthalphy change, ΔH will be negative indicating that heat has be released to the surroundings. This is termed exothermic reaction.

8 0
3 years ago
The element chlorine is represented by the symbol ____. (Capitalization is important.)
Semmy [17]
Chlorine is represented by the symbol Cl
6 0
3 years ago
Read 2 more answers
How many lithium ions are present in 30.0 ml of 0.600 m li2co3 solution?
Nikolay [14]
First; use the relationship of molarity and moles/liter to find the moles of the solution.
so 0.600M ×0.030L = 0.018 moles
Then use the mole to mole ratio of lithium to lithium carbonate
0.18 × (2 Li ÷1 Li2CO3) = 0.036
and then multiply by Avogadro's number to find the ions of lithium
0.036 moles × (6.022×10^{23} ) = 2.167 ×10∧22 ions Li
4 0
3 years ago
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