3 years ago

Which statement concerning elements is true?(1) Different elements must have different numbers of isotopes.

1 answer:

4 0

The correct statement is (4) All atoms of a given element must have the same atomic number.

Atoms come in different isotopes(which have different mass), which differ in the number of neutrons, but are still the same element (this tells you why the other options are bad).

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lisov135 [29]

Answer:

B :)

Explanation:

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7 0

3 years ago

What volume of 0.140 HCl is needed to neutralize 2.58 of Mg(OH)2 ? ...?

elena-s [515]

To make a first step you have to know the balanced form for neutralization formula: $Mg(OH)2(aq)+2HCl(aq)--\ \textgreater \ 2H2O+Mg(aq)+Cl(aq)
$
According to this, you can calculate what you are being asked : $0.0442molMg(OH)2(x)(2molHCl)/(1molMg(OH)2)=0.0885molHCl$
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2 years ago

Which of the following is a compound? H2 Ne CO2 O2

IRINA_888 [86]

Answer:

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Explanation:

4 0

3 years ago

A stuffed toy with a mass of 0.900 kilograms sits on the edge of a bed at a height of 0.830 meters. If the toy falls off the bed

olga nikolaevna [1]

PE @ 0.5m = mgh = 4.41 J
KE @ 0.5m = 0.5mv^2 = 2.91 J
ME @ 0.5m = 4.41 + 2.91 = 7.32 J

7.32 J