What is the mass of the steel block?

Chemistry

2 answers:

Rzqust [24]2 years ago

7 0

Answer:

190.2 grams

Explanation:

each arrow points to the amount it weighs, just add it all up

Tatiana [17]2 years ago

3 0

Answer:

190g

Explanation:

Using the scale, you can see that both arrows are over 100 and 90. You simply add these integers together to get your answer. 100 + 90 = 190. But don't forgot your units! If you don't add the g, the answer may be considered wrong. Good luck!

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A buffer is composed of nh3 and nh4cl. How would this buffer solution control the ph of a solution when a small amount of a stro

Shkiper50 [21]

Answer:

According to Le-chatelier principle, equilibrium will shift towards left to minimize concentration of $OH^{-}$ and keep same equilibrium constant

Explanation:

In this buffer following equilibrium exists -

$NH_{3}(aq.)+H_{2}O(l)\rightleftharpoons NH_{4}^{+}(aq.)+OH^{-}(aq.)$

So, $OH^{-}$ is involved in the above equilibrium.

When a strong base is added to this buffer, then concentration of $OH^{-}$ increases. Hence, according to Le-chatelier principle, above equilibrium will shift towards left to minimize concentration of $OH^{-}$ and keep same equilibrium constant.

Therefore excess amount of $OH^{-}$ combines with $NH_{4}^{+}$ to produce ammonia and water. So, effect of addition of strong base on pH of buffer gets minimized.

5 0

3 years ago

Johanna makes the table below to organize her notes about centripetal forces. Which type of force should she place in the cell m

Valentin [98]

Answer: The correct answer is Option 2.

Explanation:

Centripetal force is defined as the force that acts on a body moving in a circular path and is directed towards the center around which the body is moving.

Mathematically,

$F_c=\frac{mv^2}{r}$