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Oliga [24]
4 years ago
15

Which element has 38 electrons, is found in group 2, period 5? Fun fact: This element gives us the bright red colors in firework

s!
Chemistry
1 answer:
SpyIntel [72]4 years ago
5 0

Strontium is the second element placed in the 5th period. It is an alkaline earth metal, a relatively reactive group, although not nearly as reactive as the alkali metals.                                

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Which of the following molecules would you expect to act as allosteric activator of an enzyme in glycolysis?ADPNADP+pyruvateNADP
ludmilkaskok [199]

in absence of oxygen.

i have resd about in my biology textbook.

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8 0
3 years ago
When a strip of magnesium metal is placed in an aqueous solution of copper(II) nitrate, elemental copper coats the surface of th
Lera25 [3.4K]

Answer:

1. 2+ (Cu^{2+}).

2. 0 (Cu^0).

Explanation:

Hello,

In this case, the described chemical reaction is a redox reaction in fact, since the oxidation states of both magnesium and copper change as shown due to the displacement:

Mg(s)+Cu(NO_3)_2(aq)\rightarrow Mg(NO_3)_2(aq)+Cu(s)

Therefore:

1. Since copper is the cation in the copper (II) nitrate, the (II) means that its charge is 2+ (Cu^{2+}).

2. Since copper is alone, it means no electrons are being neither shared not given, its charge is 0 (Cu^0).

Best regards.

4 0
3 years ago
What is the identity of a gas that has a density of 1.4975 g/L and a volume of 8.64 L at a pressure of 2.384 atm and with a temp
bagirrra123 [75]
Answer: H2O (water)

Explanation:

The answer choices for this question are:

A) H2O
B) N2
C) SO2
D) NO3
E) Cl2

The solution of the problem is:

1) Data:

<span> density, d = 1.4975 g/liter
volume, V = 8.64 liter
pressure, p = 2.384 atm
temperature, T = 349.6 K

2) Formulas:

d = m/V => m = d*V

n = m / molar mass => molar mass = m / n

pV = nRT => n = pV / RT

3) Solution

n = pV / RT = 2.384 atm * 8.64 liter / (0.0821 atm*liter/K*mol * 349.6K)

n = 0.7176 moles

</span>m = dV = 1.4975 g/ liter * <span>8.64 liter = 12.9384 g

molar mass = m / n = 12.9384 g / 0.7176 moles = 18.03 g/mol

That molar mass corresponds to the molar mass of water, therefore the gas is H2O (water vapor).</span>
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Which of the following is an example of improved functioning as related to the benefits of muscular strength and endurance train
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I believe the answer is letter A

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4 years ago
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Which describes bedrock?
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D, forms from decomposed material
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