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frozen [14]
4 years ago
8

What goes in the blank section? A. Rarely B. Sometimes C. Never D. Always

Chemistry
1 answer:
solmaris [256]4 years ago
5 0

Answer:

I believe the answer is B. Sometimes.

Explanation:

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A substance has a mass of 10 grams and a volume of 5mL. What is its density?
kodGreya [7K]

Answer:

The answer is

<h2>2.0 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

<h3>density =  \frac{mass}{volume}</h3>

From the question

mass = 10 g

volume = 5 mL

The density of the substance is

density =  \frac{10}{5}

We have the final answer as

<h3>2.0 g/mL</h3>

Hope this helps you

4 0
3 years ago
Write the balanced equation for the reaction of aqueous Pb ( ClO 3 ) 2 with aqueous NaI . Include phases. chemical equation: Wha
Citrus2011 [14]

<u>Answer:</u> The mass of lead iodide produced is 9.22 grams

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

Molarity of NaI = 0.200 M

Volume of solution = 0.200 L

Putting values in above equation, we get:

0.200M=\frac{\text{Moles of NaI}}{0.200}\\\\\text{Moles of NaI}=(0.200mol/L\times 0.200L)=0.04moles

The chemical equation for the reaction of NaI and lead chlorate follows:

Pb(ClO_3)_2(aq.)+2NaI(aq.)\rightarrow PbI_2(s)+2NaClO_3(aq.)

By Stoichiometry of the reaction:

2 moles of NaI reacts produces 1 mole of lead iodide

So, 0.04 moles of NaI will react with = \frac{1}{2}\times 0.04=0.02mol of lead iodide

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Molar mass of lead iodide = 461 g/mol

Moles of lead iodide= 0.02 moles

Putting values in above equation, we get:

0.02mol=\frac{\text{Mass of lead iodide}}{461g/mol}\\\\\text{Mass of lead iodide}=(0.02mol\times 461g/mol)=9.22g

Hence, the mass of lead iodide produced is 9.22 grams

6 0
3 years ago
What does calcium carbonate+ hydrolchloric acid =
Monica [59]
Calcium Carbonate is CaCO3
Hydrochloric Acid is HCl

CaCO3 + 2HCl ----> CaCl2 + H2O + CO2
6 0
4 years ago
What does this represent about the type of change
nasty-shy [4]

Answer:

<h3>A) a chemical change started immediately and finished at 8 minutes!!</h3>

Explanation:

it is stated that the substance <em>slowly </em>starts turning blue, not that it suddenly started changing!! and, this couldn't be a non-chemical change because there are very few chemicals that can turn a completely different color when the two substances were the same color!!! ^_^ please let me know if messed anything up

4 0
4 years ago
Question 19-20<br> I’m not really sure, can someone help me
Nesterboy [21]
Hi my name is Jaleesa The answer = -1
6 0
3 years ago
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