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3 years ago

What is a common form for synthesis reactions?

Chemistry

1 answer:

mamaluj [8]3 years ago

8 0

Answer:

The Best Answer would be B but the correct answer is A+B --> AB

Explanation:

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A certain radioactive element has a half-life of one hour. if you start with 1.0 gram of the element at noon, how much of the ra

skelet666 [1.2K]

Answer: 0.25 g
I just took this test and that was the answer to it.

3 0

4 years ago

Read 2 more answers

Which element is most reactive and why?<br>Fe<br>Mg<br>Pb<br>Zn

murzikaleks [220]

Answer:

Magnesium is the most reactive element. it is higher than the other elements (Fe, Pb, Zn) in the electrochemical series

3 0

3 years ago

Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 1.20 MJ 1

mars1129 [50]

Answer : The mass of liquid sodium needed are, $3.17\times 10^3g$

Explanation :

First we have to calculate the number of moles of liquid sodium.

$q=n\times c\times (\Delta T)$

where,

q = heat absorb = 1.20 MJ = 1.20 × 10⁶ J

n = number of moles of liquid sodium = ?

c = specific heat capacity = $30.8J/mol.K$

$\Delta T$ = change in temperature = $10.0^oC=273+10.0=283K$

Now put all the given values in the above formula, we get:

$1.20\times 10^6J=n\times 30.8J/mol.K\times 283K$

$n=137.7mol$

Now we have to calculate the mass of liquid sodium.

Molar mass of Na = 23 g/mol

$\text{Mass of Na}=\text{Moles of Na}\times \text{Molar mass of Na}$

$\text{Mass of Na}=137.7mol\times 23g/mol=3167.1g=3.17\times 10^3g$

Therefore, the mass of liquid sodium needed are, $3.17\times 10^3g$

3 0

4 years ago

Define measurement. why is it important in our life?

Fiesta28 [93]

Answer:

Measurements are so often taken for granted we sometimes do not appreciate the grand importance measurements play in our lives. On a baseline level, measurements fall into the categories of weight, area, volume, length and even temperature. While we look at these various categories as stoic forms of mathematical measurements a closer examination of things we do in everyday life reveals their clear importance.

Explanation:

Measurements provide structure and remove the chaos that would result without any congruent method of understanding weight, mass, temperature, etc.

4 0

3 years ago

Read 2 more answers

What is the empirical formula of an oxide of chromium that is 48% oxygen

AnnyKZ [126]

Answer:

$CrO_3$

Explanation:

Hello,

In this case, considering that the compound is 48% oxygen, we infer it is 52% chromium, therefore, by using their atomic masses we compute the moles by assuming those percentages as masses:

$n_{Cr}=52g*\frac{1mol}{52g}=1mol\\ \\n_O=48g*\frac{1mol}{16g}=3mol$

Next, by dividing by the smallest moles, we find the subscripts in the empirical formula:

$Cr=\frac{1}{1} =1\\\\O=\frac{3}{1} =3$

Which are also expressed in the smallest whole numbers, therefore the empirical formula is:

$CrO_3$

Which corresponds to the chromic oxide or chromium (IV) oxide.

Regards.

6 0

3 years ago