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3 years ago

Which sentence about the periodic table of elements is true? *

1 answer:

5 0

Answer: metals are found on the left side of the periodic table

Justification:

A. All elements in period 2 are metals: FALSE.

The period 2 include metals and no metals: Li and Be are metals, while B is a metaloid, and C, N, O, and F are non-metals

B. All elements in group 18 are metals: FALSE.

The elements in group 18 are known as noble gases: He, Ne, Ar, Kr, Xe, Rn, and Og (recently named). All of them are non-metals.

C. Metals are found on the left side of the periodic table. TRUE.

With exception of H.

Alkalyne metals are the group 1 (Li, Na, K, Rb, Cs, and Fr).

Alkalyne-earth metals are the group 2: Be, Mg, Ca, Sr, Ba, and Ra.

Those two are the groups most to the left.

The non-metals are all on the right side of the periodic table.

D. Metals are found on the right side of the periodic table. FALSE.

According to the previous information.

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Example: Make 100 mL 0.05 M NaOH from a 1.5 M solution. 0.05 * 100 = 1.5 * ?

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Answer:

3.33

Explanation:

M= 0.05*100/1.5= 3.33

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3 years ago

What volume of a concentrated HCl solution, which is 36.0% HCl by mass and has a density of 1.179 g/mL, should be used to make 4

Ivenika [448]

Answer:

130ml of HCl(36%) in 4.90L solution => pH = 1.50

Explanation:

Need 4.90L of HCl(aq) solution with pH = 1.5.

Given pH = 1.5 => [H⁺] = 10⁻¹·⁵M = 0.032M in H⁺

[HCl(36%)] ≅ 12M in HCl

(M·V)concentrate = (M·V)diluted

12M·V(conc) = 0.032M·4.91L

=> V(conc) needed = [(0.032)(4.91)/12]Liters = 0.0130Liters or 130 ml.

Mixing Caution => Add 131 ml of HCl(36%) into a small quantity of water (~500ml) then dilute to the mark.

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3 years ago

Please complete the sentence. You can separate the parts of any mixture by using _____________ processes.

elena55 [62]

I believe the answer is filtration.

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4 years ago

Read 2 more answers

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valentinak56 [21]

Your answer would have to be #3

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3 years ago

Which of the following gases would have the greatest kinetic energy at 300 K?

tekilochka [14]

Answer:

D. All of them would have the same kinetic energy

Explanation:

The expression for the kinetic energy of the gas is:-

$K.E.=\frac{3}{2}\times K\times T$

k is Boltzmann's constant = $1.38\times 10^{-23}\ J/K$

T is the temperature

Since, kinetic energy depends only on the temperature. Thus, at same temperature, at 300 K, all the gases which are $N_2,\ NH_3\ and\ Ar$ will posses same value of kinetic energy.

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3 years ago