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UkoKoshka [18]
3 years ago
11

1. An element is defined by the number of:

Chemistry
1 answer:
IrinaVladis [17]3 years ago
3 0

Answer:

The correct answer for this question would be B) Protons

Explanation:

I got it right on my test (Can I have brainlyest)

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Pb(NO3)2+K2CrO4=PbCrO4+KNO3 reaction type​
Dmitry [639]
Precipitation reaction and double displacement reaction
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3 years ago
How many grams of potassium carbonate are needed to make 300ml of a 4.5M solution?
kenny6666 [7]

Answer:

186.3g

Explanation:

4.5moles of K₂CO₃  is in 1000ml

? moles of K₂CO₃ is in 300 ml

(4.5 × 300)/ 1000 = 1.35 moles of K₂CO₃

1 mole of K₂CO₃ = (39 × 2) + 12 + (16 × 3) = 78 + 12 + 48 = 138g

1.35 moles of K₂CO₃  = ?

= (1.35 × 138)/1 = 186.3g

4 0
3 years ago
State and explain the relative change in the pH and in the buffer-component concentration ratio, [NaA]/[HA], for each of the fol
melisa1 [442]

When pure HA is added to the buffer, the buffer component ratio and the pH decrease.

<h3>State and explain the relative change in the pH and in the buffer-component concentration ratio, [NaA]/[HA] for the dissolve of pure HA in the buffer.</h3>

When pure HA is added to the buffer, the buffer component ratio and the pH decrease. The added HA increases the concentrations of NA and HA. However, there is a greater relative increase in the concentration of HA. Hence, the ratio of [NaA]/[HA] decreases, causing the solution to become more acidic.

The capacity of a buffer to withstand pH change is measured. The concentration of the buffer's components namely, the acid and its conjugate base determine this ability. Greater buffer capacity is associated with higher buffer concentration.

To learn more about buffer-component, Visit:

brainly.com/question/9542245

#SPJ4

8 0
2 years ago
One difference between plant and animal cells is that animal cells do not have
rewona [7]

Chloroplasts.

Plants use chloroplasts to create their own energy by using sunlight.

3 0
4 years ago
Read 2 more answers
Semimetals is a term which refers to
SCORPION-xisa [38]
I guess you could call them that. In chemistry, we call them Metalloids though.
5 0
3 years ago
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