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Hunter-Best [27]

2 years ago

15

Which equation illustrates conservation of mass?

1 answer:

saul85 [17]2 years ago

6 0

Answer: d

explanation: in both reactants and products there are 2 hydrogen and 2 chlorine atoms

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You are instructed to create 900. mL of a 0.29 M phosphate buffer with a pH of 7.8. You have phosphoric acid and the sodium salt

Aleksandr [31]

Answer:

B and C

Explanation:

When we have to do a buffer solution we always have to choose the reaction that has the <u>pKa closer to the desired pH value</u>. When we find the pKa values we will obtain:

$pKa_1=-Log[6.9x10^-^3]=2.16$

$pKa_2=-Log[6.2x10^-^8]=7.20$

$pKa_3=-Log[4.8x10^-^13]=12.31$

The closer value is pKa2 with a value of 7.2. Therefore we have to use the second reaction. In which $H_2PO_4^-^1$ is the <u>acid</u> and $HPO_4^-^2$ is the <u>base</u>. Therefore the answer for the first question is B and the answer for the second question is C.

8 0

2 years ago

Two processes are described below:

UNO [17]

Answer:

i would say D i just did this but i kinda forgot so sorry if im wrong or A

Explanation:

4 0

3 years ago

Read 2 more answers

Name one other organ system that would be affected if it had no marrow.Explain?

muminat

It can possible be you're arteries or also you're intestines with is large and small.

6 0

2 years ago

What would happen to a animal cell if it had n\an lysosome?

pantera1 [17]

Honestly I don't know

4 0

2 years ago

The digit that would have to be estimated in reading this instrument would be the nearest:

wariber [46]

Answer:

The least count of vernier calipers is 0.01 g.

(B) is correct option.

Explanation:

Given that,

The digit that would have to be estimated in reading this instrument,

According to figure,

We need to calculate the pitch

Using formula of pitch

$pitch=\dfrac{distance\ moved}{Number\ of\ complete\ rotation}$

Put the value into the formula

$pitch=\dfrac{1}{10}$

$pitch=0.1\ g$

We need to calculate the least count of vernier calipers

Using formula of least count

$Least\ count=\dfrac{pitch}{number\ of\ vernier\ scale\ division}$

Put the value into the formula

$Least\ count=\dfrac{0.1}{10}$

$Least count = 0.01\ g$

Hence, The least count of vernier calipers is 0.01 g.

(B) is correct option.

4 0

3 years ago

Read 2 more answers