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oksano4ka [1.4K]

4 years ago

7

The modern periodic table is arranged by increasing

1 answer:

Lilit [14]4 years ago

5 0

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.

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If the mass of a material is 118 grams and the volume of the material is 12 cm3, what would the density of the material be?

Sliva [168]

Density is equal to mass divided by volume.

So D=118/12

D=9.83

5 0

3 years ago

(I ONLY HAVE 15 MIN LEFT IN MY TEST PLEASE HELP ME!!)

zloy xaker [14]

Answer:

183g

Explanation:

mass can't be created or destroyed so i think you just add up the total amounts of matter

8 0

3 years ago

Given the balanced equation 2C4H10 + 13O2 → 8CO2 + 10H2O, how many moles of CO2 are produced when 14.9g of O2 are used?

Anna [14]

Answer: The number of moles of $CO_2$ produced are, 0.287 moles.

Explanation : Given,

Mass of $O_2$ = 14.9 g

Molar mass of $O_2$ = 32 g/mol

First we have to calculate the moles of $O_2$

$\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}$

$\text{Moles of }O_2=\frac{14.9g}{32g/mol}=0.466mol$

Now we have to calculate the moles of $CO_2$

The balanced chemical equation is:

$2C_4H_{10}+13O_2\rightarrow 10H_2O+8CO_2$

From the reaction, we conclude that

As, 13 mole of $O_2$ react to give 8 moles of $CO_2$

So, 0.466 mole of $O_2$ react to give $\frac{8}{13}\times 0.466=0.287$ mole of $CO_2$

Therefore, the number of moles of $CO_2$ produced are, 0.287 moles.

3 0

3 years ago

During a chemical reaction, an iron atom became the ion Fe2+. What happened to the iron atom?

kirill115 [55]

Explanation:

Iron atom is been oxidised as it losses 2 electron to form 2 + ion.

4 0

3 years ago

Which option is an example of a physical change? Question 3 options: baking bread burning paper cooking eggs cutting paper

Aleks04 [339]

Answer:cutting paper

Explanation:

4 0

3 years ago