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jok3333 [9.3K]
3 years ago
10

Mass is measured against a standard using a

Chemistry
2 answers:
Sholpan [36]3 years ago
6 0
The answer is c Balance hope it helps 
Tamiku [17]3 years ago
3 0
The answer is a balance
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Which statement accurately compares the trends in atomic number and atomic mass in the periodic table
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Answer: is C

Explanation:

Both the atomic mass and the atomic number increase from left to right

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Benzoic acid, c6h5cooh, has a ka = 6.4 x 10-5. what is the concentration of h3o+ in a 0.5 m solution of benzoic acid? 3.2 x 10-5
FinnZ [79.3K]
The answer for this issue is: 
The chemical equation is: HBz + H2O <- - > H3O+ + Bz- 
Ka = 6.4X10^-5 = [H3O+][Bz-]/[HBz] 
Let x = [H3O+] = [Bz-], and [HBz] = 0.5 - x. 
Accept that x is little contrasted with 0.5 M. At that point, 
Ka = 6.4X10^-5 = x^2/0.5 
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pH = 2.25
(x is without a doubt little contrasted with 0.5, so the presumption above was OK to make) 
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Which two things affect how a lens refracts light?
Romashka-Z-Leto [24]

Answer:

Explanation:

the correct answer is A

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2 years ago
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An object can become electrically charged if it gains or loses which particles?
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The pH of a solution is 3.81. What is the OH concentration in the solution?​
disa [49]

Answer:

6.46 × 10⁻¹¹ M

Explanation:

Step 1: Given data

pH of the solution: 3.81

Step 2: Calculate the pOH of the solution

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pH + pOH = 14.00

pOH = 14.00 - pH = 14.00 - 3.81 = 10.19

Step 3: Calculate the concentration of OH⁻ ions

We will use the definition of pOH.

pOH = -log [OH⁻]

[OH⁻] = antilog -pOH = antilog -10.19 = 6.46 × 10⁻¹¹ M

3 0
2 years ago
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