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3 years ago

Please anyone help me

Chemistry

2 answers:

serg [7]3 years ago

6 0

Answer:

It is c

Explanation:

Fofino [41]3 years ago

3 0

Answer:

W and Z, because they are in the same group as one another

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A 2 kg toy car and a 5 kg toy car are pushed with an equal amount of force. Which toy car will have the least acceleration?

pishuonlain [190]

Answer:

The 5 kg toy car will have least acceleration

Explanation:

3 0

3 years ago

A sample of a pure compound that weighs 60.3 g contains 20.7 g Sb (antimony) and 39.6 g F (fluorine). What is the percent compos

Volgvan

Answer:

The percent composition of fluorine is 65.67%

Explanation:

Percent Composition is a measure of the amount of mass an element occupies in a compound. It is measured in percentage of mass.

That is, the percentage composition is the percentage by mass of each of the elements present in a compound.

The calculation of the percentage composition of an element is made by:

$percent composition element A=\frac{total mass of element A}{mass of compound} *100$

In this case, the percent composition of fluorine is:

$percent composition of fluorine=\frac{39.6 g}{60.3 g} *100$

percent composition of fluorine= 65.67%

<u><em>The percent composition of fluorine is 65.67%</em></u>

4 0

4 years ago

Measurements show that enthalpy of a mixture of gaseous reactants decreases by 228. kJ during a certain chemical reaction, which

Tcecarenko [31]

Total change in energy = Heat produced by system + work done on the system
= 228 - 55
= 173 kJ

Because this energy is released as heat, the reaction is exothermic.

7 0

3 years ago

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The naturally occurring isotopes of vanadium are vanadium-50 and vanadium-51. Vanadium-50 has an abundance of 0.250% and a mass

fomenos

Answer:

The answer to your question is letter A

Explanation:

Abundance Atomic mass

V-50 0.25% 49.947

V-51 99.750% 50.944

Formula

Average atomic mass = [V-50-Abundance x V-50-Atomic mass] +

[ V-51-Abundance x V-51-Atomic mass]

Substitution

Average atomic mass = [ 0.0025 x 49.947] + [0.9975 x 50.944]

= 0.125 + 50.817

Result

= 50.942 amu

4 0

3 years ago

Which type of material becomes molten rock at subduction zones?

Andrei [34K]

Answer:

Light plates, heavy plates, continental crust, or new oceanic crust

Explanation:

3 0

4 years ago

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