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2 years ago

5. What is common among the following phenomena?

Chemistry

1 answer:

Tanzania [10]2 years ago

5 0

Answer:

All are periodic changes

[And is that a todoroki pfp, I like MHA too

(・∀・) ]

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PLSS HELP ME! Read each statement below and decide if you agree or disagree. Write Agree or Disagree below each statement, based

motikmotik

Answer:

1. Temperature is the measurement of how hot or cold something is.

agree

2. When something heats up, new energy is created, and when something cools down, energy is destroyed.

disagree

3.When something heats up, it moves faster, and when something cools down, it moves slower.

agree

4. Hotter things have more energy than colder things.

agree

4 0

2 years ago

A chemist must prepare 800.0mL of sodium hydroxide solution with a pH of 12.10 at 25°C. She will do this in three steps: Fill a

AnnZ [28]

Answer:

0.42 g

Explanation:

pH = 12.10 (25 °C)

V = 800.0 mL = 0.800 L

To find the mass of sodium hydroxide (NaOH) we can use the pH:

$14 = pH + pOH$

$pOH = 14 - pH = 14 - 12.10 = 1.90$

$pOH = -log ([OH^{-}])$

$[OH]^{-} = 10^{-pOH} = 10^{-1.90} = 0.013 M$

Now, we can find the number of moles (η) of OH:

$\eta = ([OH]^{-})*V = 0.013 mol/L * 0.800 L = 1.04 \cdot 10^{-2} moles$

Since we have 1 mol of OH in 1 mol of NaOH, the number of moles of NaOH is equal to 1.04x10⁻² moles.

Finally, with the number of moles we can find the mass of NaOH:

$m = \eta * M$

<em>Where M is the molar mass of NaOH = 39.9 g/mol </em>

$m = 1.04 \cdot 10^{-2} moles * 39.9 g/mol = 0.42 g$

Therefore, the mass of sodium hydroxide that the chemist must weigh out in the second step is 0.42 g.

I hope it helps you!

3 0

3 years ago

exothermic reaction in which the reaction releases energy as heat. 4. How would the reaction would change if you added 2 g of st

Margaret [11]

Answer:

Explanation:

We know that the composition of Steel includes Carbon and Iron. So, if 2g of steel wool was added to the iron acetate, then the iron acetate is now being reduced. What will happen is that the solution will be triggered as it becomes denser and get highly concentrated. Hence, an increase in concentration leads to a decrease in reaction rates. Thus, a slow reaction will take place, and the reaction rate will decrease.

6 0

3 years ago

An agent of weathering where liquid water seeps into the cracks of rocks is called?

babunello [35]

Answer:

Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock. If temperatures drop low enough, the water will freeze. ... This specific process (the freeze-thaw cycle) is called frost weathering or cryofracturing.

5 0

2 years ago

Read 2 more answers

A nuclear _ is a large chamber where fuel rods are located

Mars2501 [29]

The answer is going to be a nuclear reactor

7 0

2 years ago