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3 years ago

If the element A have three protons in the nucleus. find the atomic number of the element A

Chemistry

1 answer:

sweet-ann [11.9K]3 years ago

3 0

Answer:

ATOMIC number of element A is 3

Explanation:

Atomic number is the same as number of protons of an element.

according to the periodic table, Lithium is the element with 3 protons in its neutral state and it's atomic number is 3.

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The volume of a sample of gas, initially at 25 °C and 158 mL, increases to

Artist 52 [7]

Answer:

The final temperature = 848.7 K or 575.7 °C

Explanation:

Step 1: Data given

Temperature = 25.0 °C = 298 K

Volume = 158 mL = 0.158 L

The volume increases to 450 mL = 0.450 L

The pressure is constant

Step 2: Calculate the final temperature

V1/T1 = V2/T2

⇒with V1 = the initial volume = 0.158 L

⇒with T1 = the initial temperature = 298 K

⇒with V2 = the increased volume = 0.450 L

⇒with T2 = the new temperature = TO BE DETERMINED

0.158 L / 298 K = 0.450 L / T2

T2 = 0.450 L / (0.158L/298K)

T2 = 848.7 T

The final temperature = 848.7 K or 575.7 °C

5 0

3 years ago

For the following aqueous reaction, complete and balance the molecular equation and write a net ionic equation, making sure to i

lozanna [386]

Answer :

The complete net ionic equation is :

$2OH^-(aq)+2H^+(aq)\rightarrow 2H_2O(l)$

Explanation :

Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.

Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The balanced molecular equation will be,

$Ca(OH)_2(aq)+2HNO_3(aq)\rightarrow Ca(NO_3)_2(aq)+2H_2O(l)$

The complete ionic equation in separated aqueous solution will be,

$Ca^{2+}(aq)+2OH^-(aq)+2H^+(aq)+2NO_3^{-}(aq)\rightarrow Ca^{2+}(aq)+2NO_3^{-}(aq)+2H_2O(l)$

In this equation the species, $Ca^{2+}^\text{ and }NO_3^{-}$ are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The complete net ionic equation is:

$2OH^-(aq)+2H^+(aq)\rightarrow 2H_2O(l)$

7 0

3 years ago

When completing an experiment, results will be much more accurate if multiple trials are completed and the results averaged. TRU

grandymaker [24]

<span>When completing an experiment, results will be much more accurate if multiple trials are completed and the results averaged. True. That's because you may get different results each time. </span>

5 0

3 years ago

Read 2 more answers

The enthalpy change for the reaction of titanium metal with gaseous iodine is given by the following thermochemical equation: 2

julia-pushkina [17]

Answer : The enthalpy change for the reaction is, 419.5 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

The given chemical reaction is,

$2Ti(s)+3I_2(g)\rightarrow 2TiI_3(s)$ $\Delta H=-839kJ$