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finlep [7]
3 years ago
14

23. How many different elements are in the compound sodium carbonate (Na2CO3)? *

Chemistry
1 answer:
Mrac [35]3 years ago
5 0

Na, C, and O so the answer is c. 3

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What is the wavelength of radiation that has a frequency of 7.2×10^11 s−1 ?
Airida [17]

Explanation:

It is known that relation between wavelength and frequency is as follows.

                  \lambda = \frac{c}{\nu}

where,        \lambda = wavelength

                       c = speed of light = 3 \times 10^{8} m/s

                  [/tex]\nu[/tex] = frequency

It is given that frequency is 7.2 \times 10^{11} s^{-1}. Hence, putting this value into the above formula and calculate the wavelength as follows.

                    \lambda = \frac{c}{\nu}

                    \lambda = \frac{3 \times 10^{8} m/s}{7.2 \times 10^{11} s^{-1}}

                             = 0.416 \times 10^{-3} m

or,                         = 4.16 \times 10^{-4} m

Thus, we can conclude that wavelength of given radiation is 4.16 \times 10^{-4} m.

6 0
3 years ago
Mass defect for the isotope thorium-234 = 1.85864 amu.
SIZIF [17.4K]

Answer:

3.09 × 10-27  kg

Explanation:

I also had this question on edge and got it correct

8 0
3 years ago
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What are the different characteristics that can be used to identify an unknown mineral
brilliants [131]
These are just a couple ways to identify unknown minerals,touch taste smell 

4 0
4 years ago
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Cuantos gramos de hidróxido de calcio se necesitan para preparar 875ml de solución al 2M​
PtichkaEL [24]

Answer:

129,66 g

Explanation:

Desde,

Número de moles = concentración * volumen

concentración = 2 M

volumen = 875 ml

Número de lunares = 2 * 875/1000

Número de lunares = 1,75 moles

Número de moles = masa / masa molar

masa molar de hidróxido de calcio = 74.093 g / mol

1,75 moles = masa / 74,093 g / mol

masa = 1,75 moles * 74,093 g / mol

masa = 129,66 g

7 0
3 years ago
When explaining chemical reactions to a friend, Brianna models a reaction by taking several colors of modeling clay and making a
Ludmilka [50]

Answer:

True

Explanation:

A synthesis reaction is one that involves the combination of more than one reactants to form a single product. This is directly opposite to a decomposition reaction where a complex compound is broken down into various products.

Examples of synthesis reaction are;

1. The combination of sodium with chlorine to form sodium chloride.

2. The combination of hydrogen and oxygen to form water

so explaining what Brianna did, the models of clay are the reactants coming together to form a single product which is the sculpture.

5 0
3 years ago
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