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Darina [25.2K]
3 years ago
11

Demonstrate a net force of 50 N to the left. Use three different combinations of people to get the same net force. How many peop

le did you place on each side?
Chemistry
2 answers:
balandron [24]3 years ago
7 0
They Combined together
Evgesh-ka [11]3 years ago
6 0

Answer:

They started to combine the forces all together.

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Which of the following is an example of a pure substance? *
Natali [406]

Answer:

Iron shavings

Explanation:

A substance that has a fixed chemical composition throughout and a mixture is when two or more substances are combined, but they are not combined chemically.

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3 years ago
Chemist question, helppp pls
Doss [256]

1: it is +2

2: it is +6

(Make this brainliest answer please)

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3 years ago
Which element has a total of 32 protons
BaLLatris [955]

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Germanium

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5 0
3 years ago
Read 2 more answers
A chemist measures the enthalpy change ?H during the following reaction: Fe (s) + 2HCl (g) ? FeCl2 (s) + H2 (g) =?H?157.kJ Use t
erik [133]

Correct Question:

A chemist measures the enthalpy change ΔH during the following reaction: Fe(s) + 2HCl(g)-->FeCl2(s) + H2 ΔH=-157.0 kJ. Use this information to complete the table below. Round each of your answers to the nearest kJ/mol

Answer:

-314 kJ

+628 kJ

+157 kJ

Explanation:

The enthalpy change of a reaction measures the amount of heat that is lost or gained by it. If ΔH >0 the heat is gained, and the reaction is called endothermic, if ΔH<0, the heat is lost, and the reaction is called exothermic.

If the reaction is inverted, the value of ΔH is inverted too (the opposite endothermic reaction is exothermic), and if the reaction is multiplied by a constant, ΔH will be multiplied by it too.

1) 2Fe(s) + 4HCl --> 2FeCl2(s) + 2H2(g)

This reaction is the product of the given reaction by 2, so

ΔH = 2*(-157) = -314 kJ

2) 4FeCl2(s) + 4H2(g) --> 4Fe(s) + 8HCl(g)

This reaction is the inverted reaction given multiplied by 4, so

ΔH = 4*(157) = +628 kJ

3) FeCl2(s) + H2(g) --> Fe(s) + 2HCl

This reaction is the inverted reaction given, so

ΔH = +157 kJ

4 0
3 years ago
Please help ————//-//
grandymaker [24]
Probably b because soil can’t be the exact same and so that cancels out a and d
6 0
3 years ago
Read 2 more answers
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