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3 years ago

5

pls help If we multiply the mass of an object and the acceleration due to gravity, we find the downward force of the object whic

h is also known as: a. volume b. density c. weight

1 answer:

Furkat [3]3 years ago

8 0

C
Hope this helped you

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This method of treating water kills microbes and removes other contaminates such as heavy metals.

Ivenika [448]

The answer is (B).
Hope this helps :).

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3 years ago

In which reaction does the oxidation number of hydrogen change? In which reaction does the oxidation number of hydrogen change?

dedylja [7]

<u>Answer:</u> The correct answer is $2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq.)+H_2(g)$

<u>Explanation:</u>

Oxidation number is defined as the number which is given to an atom when it looses or gains electron. When an atom looses electron, it attains a positive oxidation state. When an atom gains electron, it attains a negative oxidation state.

Oxidation state of the atoms in their elemental state is considered as 0. Hydrogen is present as gaseous state.

For the given chemical reactions:

<u>Reaction 1:</u> $2HClO_4(aq.)+CaCO_3(s)\rightarrow Ca(ClO_4)_2(aq.)+H_2O(l)+CO_2 (g)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: +1

Thus, the oxidation state of hydrogen is not changing.

<u>Reaction 2:</u> $CaO(s)+H_2O(l)\rightarrow Ca(OH)_2(s)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: +1

Thus, the oxidation state of hydrogen is not changing.

<u>Reaction 3:</u> $HCl(aq.)+NaOH(aq.)\rightarrow NaCl(aq.)+H_2O(l)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: +1

Thus, the oxidation state of hydrogen is not changing.

<u>Reaction 4:</u> $2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq.)+H_2(g)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: 0

Thus, the oxidation state of hydrogen is changing.

<u>Reaction 5:</u> $SO_2(g)+H_2O(l)\rightarrow H_2SO_3(aq.)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: +1

Thus, the oxidation state of hydrogen is not changing.

Hence, the correct answer is $2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq.)+H_2(g)$

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3 years ago

a rock has a density of 17 g/cm3. If it is cut into 3 equal size pieces, what will be the density of each piece?

erma4kov [3.2K]

All pieces will be 17 g/cm^3 because the density is not affected by cutting (assuming the rock is uniform).

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2 years ago

To practice for an Ironman competition, John rode his bike for 15 kilometers. How many

puteri [66]

Answer:

15000

Explanation:

1000 Meters in a kilo meter. So multiply 15 by a 1000.

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3 years ago

propose a mathematical equation to calculate tje charge on an ion from the number of protons and electrons in an ion.

Y_Kistochka [10]

If the ion is a cation, it has a positive charge because it LOST electrons. If its an anion, then it has a negative electron because it GAINED electrons.

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3 years ago