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EastWind [94]
3 years ago
15

How can the existence of atoms help to explain the law of define proportions .

Chemistry
1 answer:
Dima020 [189]3 years ago
6 0

Answer:

Atoms of same element can combine in more than one ratio to form two or more compounds. Atoms are the smallest unit of matter that can take part in a chemical reaction. The law of definite proportions states that a chemical compound always contains exactly the same proportion of elements by mass.

Explanation:

Hope this helps :)

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PH3, explain why there is a partial positive on hydrogen and partial negative on phosphorus.
Paraphin [41]

Answer:

Phosphorus is more electronegative than hydrogen

Explanation:

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons towards itself thereby making a molecule to be polar. The Pauling scale is the most commonly used to measure electronegativity. Fluorine (the most electronegative element) is assigned a value of 4.0 on the Pauling's scale, and values range down to caesium and francium which are the least electronegative elements.

Electronegativity increases from left to right across the periodic table (across the period) hence, phosphorus is far more electronegative than hydrogen. Being more electronegative than hydrogen, phosphorus attracts the bonding electron pair of the P-H bond closer to itself than hydrogen. Since the electrons of the bond are closer to phosphorus than hydrogen, the phosphorus atom acquires a partial negative charge while the hydrogen atom acquires a partial positive charge.

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2 years ago
What do we mean by basic MgO?
aliina [53]

Answer:

Magnesium oxide is a simple basic oxide, because it contains oxide ions. It reacts with water to form magnesium hydroxide which is a base.

5 0
2 years ago
Will medal!!!
hjlf
Δ H reaction = q / n where q: amount of heat released and n is number of moles of substance.
q = m . C . ΔT where:
m = mass of substance (g)
C = Specific heat capacity (4.18)
ΔT = change in temperature = 24.25 - 23.16 = 1.09
q = 1000 x 4.18 x 1.09 = 4556 J = 4.556 kJ
number of moles (n) = Molarity (M) x Volume (L)
                                 = 0.185 M x 0.07 L = 0.01295 mole
Δ H = q / n = - (4.556 kJ / 0.01295 mole) = -351.8 kJ / mol
Note: it is exothermic reaction (-ve sign)  i.e. temperature is raised

5 0
3 years ago
Is the number of genes an organism has is equal to the number of traits that organism has
Delicious77 [7]
<span>For each inherited character an organism has two alleles for the gene controlling that character.. one form each parent</span>
6 0
3 years ago
Energy produced by the sun and stars comes from
Delicious77 [7]

Answer:

It's heat energy

Explanation:

which is transmitted through radiation.  The sun warms us.

4 0
2 years ago
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