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2 years ago

Which regions on the periodic table can adopt positive and negative oxidation numbers?

1 answer:

7 0

<span>The region(s) of the periodic table which are made up of elements that can adopt both positive and negative oxidation numbers are the “non-metal” region. As we can see on the periodic table, the elements situated at the right side of the table have two oxidation states, one positive and the other a negative. </span>

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Is this statement true or false?<br><br> Gymnosperms reproduce using seeds, but angiosperms do not.

spayn [35]

Answer:

FALSE!

Explanation:

Gymnosperms do use seeds but are exposed like the pine cones of pines. Angiosperms still have seeds, however, they flower or fruit.

3 0

2 years ago

A changing magnetic field produces an electric field with open loop field lines.

Dimas [21]

Answer:

True

Explanation:

A changing magnetic field induces a current in a conductor. For example, if we move a bar magnet near a conductor loop, a current gets induced in it.

8 0

2 years ago

A sample of glass bead weighs 34.5g. The beads are heated to 100.0C in a boiling water bath and poured into a beaker containing

zaharov [31]

The heat lost by the beads is equal to the heat gained by the water. The specific heat capacity of water is 4.18 joules/gram. "w" will denote water's property and "b" will denote the beads' properties.
mw x Cpw x ΔTw = -mb x Cpb x ΔTb
100 x 4.18 x (29.9 - 25) = 34.5 x Cpb x (100 - 29.9)

Cpb = 0.84 joules/gram

3 0

2 years ago

What is the main intermolecular force in H2CO?

aivan3 [116]

Dipole-dipole interactions, and London dispersion interactions

5 0

3 years ago

Read the chemical equation.

Sladkaya [172]

Answer:- D. 1.8 moles of Fe and $2.7molCO_2$ .

Solution:- The balanced equation is:

$Fe_2O_3+3CO\rightarrow 2Fe+3CO_2$

let's first figure out the limiting reactant using the given moles and mol ratio:

$1.8molFe_2O_3(\frac{3molCO}{1molFe_2O_3})$

= 5.4 mol CO

From calculations, 5.4 moles of CO are required to react completely with 1.8 moles of Iron(III)oxide but only 2.7 moles of CO are available. It means CO is limiting reactant.

Products moles depends on limiting reactant. Let's calculate the moles of each reactant formed for given 2.7 moles of CO.

$2.7molCO(\frac{2molFe}{3molCO})$

= 1.8 mol Fe

$2.7molCO(\frac{3molCO_2}{3molCO})$

= $2.7molCO_2$

So, the correct choice is D. 1.8 moles of Fe and $2.7molCO_2$ are formed.

6 0

2 years ago