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melisa1 [442]
3 years ago
7

True or false an atom is the smallest particle of a whole element

Chemistry
1 answer:
alina1380 [7]3 years ago
5 0
True, as an atom has the same chemical properties as the first bulk element. Dalton’s Atomic Theory explains all :))
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Which of the objects in the table has the most gravitational potential energy? Explain your answer.
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Answer:

Bowling Ball

Explanation:

The bowling ball has the highest gravitational potential energy because the height at which it will fall is the highest of the rest objects on the table.

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6. An environmental chemist needs a carbonate buffer of pH 10.00 to study the effects of acid rain on limestone-rich soils. To p
pishuonlain [190]

Answer:

[Na₂CO₃] = 0.094M

Explanation:

Based on the reaction:

HCO₃⁻(aq) + H₂O(l) ↔ CO₃²⁻(aq) + H₃O⁺(aq)

It is possible to find pH using Henderson-Hasselbalch formula:

pH = pka + log₁₀ [A⁻] / [HA]

Where [A⁻] is concentration of conjugate base,  [CO₃²⁻] = [Na₂CO₃] and  [HA] is concentration of weak acid, [NaHCO₃] = 0.20M.

pH is desire pH and pKa (<em>10.00</em>) is -log pka = -log 4.7x10⁻¹¹ = <em>10.33</em>

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Replacing these values:

10.00 = 10.33 + log₁₀ [Na₂CO₃] / [0.20]

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5 0
3 years ago
How many grams of H2O are needed to produce 150 g of Mg(OH)2? (Molar mass: H2O = 18.02 g/mol; Mg(OH)2 = 58.33 g/mol )
Nuetrik [128]

Answer:

92.6

Explanation:

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108.12 g of h2o --> 174.99 of Mg(OH)2

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150g x 108.12g / 174.99 =

92.67

7 0
2 years ago
A sample of 1L of gas in a container at-73C has a pressure of 32.2inHg. To
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