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4 years ago

What’s the answer to this?

Chemistry

1 answer:

Arturiano [62]4 years ago

5 0

Answer : The balanced chemical reaction will be:

$3Ca(s)+2Al(NO_2)_3(aq)\rightarrow 2Al(s)+3Ca(NO_2)_2(aq)$

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

When solid calcium metal reacts with aqueous aluminum nitrate then it gives aqueous calcium nitrate and solid aluminium.

The balanced chemical reaction will be:

$3Ca(s)+2Al(NO_2)_3(aq)\rightarrow 2Al(s)+3Ca(NO_2)_2(aq)$

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What is the third period element with 2 valence electrons

tia_tia [17]

Answer:

<em>The</em><em> name of the element is magnesium </em>

I Hope this is right if not so sorry :)

7 0

3 years ago

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Which isotope will spontaneously decay and emit particles with a charge of +2?

VikaD [51]

Answer: The correct option is 4.

Explanation: All the options will undergo some type of radioactive decay processes. There are 3 decay processes:

1) Alpha decay: It is a decay process in which alpha particle is released which has has a mass number of 4 and a charge of +2.

$_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\alpha$

2) Beta-minus decay: It is a decay in which a beta particle is released. The beta particle released has a mass number of 0 and a charge of (-1).

$_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+_{-1}^0\beta$

3) Beta-plus decay: It is a decay process in which a positron is released. The positron released has a mass number of 0 and has a charge of +1.

$_Z^A\textrm{X}\rightarrow _{Z-1}^A\textrm{Y}+_{+1}^0\beta$

For the given options:

Option 1: This nuclei will undergo beta-plus decay process to form $_{25}^{53}\textrm{Mn}$

$_{26}^{53}\textrm{Fe}\rightarrow _{25}^{53}\textrm{Mn}+_{+1}^0\beta$

Option 2: This nuclei will undergo beta-minus decay process to form $_{80}^{198}\textrm{Hg}$

$_{79}^{198}\textrm{Au}\rightarrow _{80}^{198}\textrm{Hg}+_{-1}^0\beta$

Option 3: This nuclei will undergo a beta minus decay process to form $_{56}^{137}\textrm{Ba}$

$_{55}^{137}\textrm{Cs}\rightarrow _{56}^{137}\textrm{Ba}+_{-1}^0\beta$

Option 4: This nuclei will undergo an alpha decay process to form $_{85}^{216}\textrm{At}$

$_{87}^{220}\textrm{Fr}\rightarrow _{85}^{216}\textrm{At}+_2^4\alpha$

Hence, the correct option is 4.

7 0

4 years ago

Read 2 more answers

Chlorine 37 can be represented as

Ivahew [28]

Answer:

(37 is a superscript to the left of the symbol, and 17 is a subscript to the left of the symbol)

Explanation:

1) Chlorine-37 is the chlorine isotope with mass number 37.

2) The atomic mass of chlorine is 17. All the atoms of chlorine have the same atomic number (all the atoms of an element have the same atomic number). You find this number in a periodic table.

3) The isotope representation consists of:

i) The symbol of the element (Cl in this case) at the center of the representation.

ii) The mass number (37) as a superscript to the left of the symbol. That is:

iii) The atomic number (17) as a subscript to the left of the symbol. That completes the representation in this form:

5 0

4 years ago

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How many molecules are in 9.95 moles of Co2?

AlekseyPX

by applying the equation :

n = N/L

where

n = mol

N = number of molecules

L = avagardro constant

therefore :

N = n × L

= 9.95mol × 6.022 ×10²³ mol-¹

= 59.9189

(this has no units)

5 0

4 years ago

What is the oxygen number of N in NO2-¹

Leno4ka [110]

Answer: two

Explanation:

Oxidation Number of Nitrogen in NO2 (Nitrogen Dioxide) Nitrogen dioxide (NO2) is a molecule which contain two oxygen atom and one nitrogen atom.

8 0

3 years ago