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Serggg [28]
3 years ago
8

What will happen to the density of a substance if it contracts when it freezes?

Chemistry
1 answer:
Murrr4er [49]3 years ago
5 0
2 I am pretty sure of b/c water is basically the opposite of most liquids such as it gets larger when it freezes when most liquids get smaller b/c the molecules move slower and get closer together so 2
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According to this entry from the periodic table, a neutral nitrogen atom usually has
Sonja [21]
7 protons, 7 neutrons, and 7 electrons
8 0
2 years ago
4.2g of cerium reacted with oxygen to form 5.16g of an oxide of cerium. Find
olganol [36]

Answer:

CeO₂

Explanation:

Hello!

In this case, since we are given the mass of both cerium and the cerium oxide, we can first compute the moles of cerium and the moles of oxygen as shown below:

n_{Ce}=4.2gCe*\frac{1molCe}{140.12gCe}=0.03molCe\\

m_O=5.16g-4.2g=0.96gO\\\\n_O=0.96g*\frac{1molO}{16.0gO} =0.06molO

Now, we simply divide each moles by 0.03 as the fewest moles in the formula to obtain the simplest formula (empirical formula) of this oxide:

Ce=\frac{0.03}{0.03}=1\\\\O =\frac{0.06}{0.03}=2

Thus, the formula turns out:

CeO_2

Regards!

6 0
2 years ago
How is the rate of appearance of h2o related to the rate of disappearance of o2?
erastovalidia [21]
If we consider a combustion reaction of Methane:

The balanced equation is:

CH4 + 2O2 ---> 2H2O + CO2

The rate of appearance of H2O is rH2O, rate of disappearance of O2 is -rO2

(rH2O)^2 = (-rO2)^2
rH2O = -rO2
6 0
3 years ago
The process in which organisms grow and replace worn-out cells is called: A. Cell regeneration B. Cell division C. Mitosis D. Bo
djyliett [7]
The mitosis is the cell division so it both B and C
7 0
3 years ago
How many moles of potassium are contained in 449 g of<br> potassium?<br> pls help im so lost
e-lub [12.9K]

Answer:

449 (g K) / 39.1 (g/mol K) = 11.5 mol K

Explanation:

Potassium has atomic number 39.1

amount of K in 449g sample = 449/39.1 = 11.5 mol

4 0
2 years ago
Read 2 more answers
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