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Hitman42 [59]
3 years ago
10

A book is sliding across a horizontal tabletop. As it slides, slows down. Which of the following statements best explains this s

ituation?
There is a balanced force on the book caused by gravity.

There is no upward force acting on the book.

There is an unbalanced force on the book caused by friction.

There are no unbalanced forces acting on the book.
Chemistry
2 answers:
Anon25 [30]3 years ago
4 0

Answer:

There is an unbalanced force on the book caused by friction.

Explanation:

when solid slides on solid (excluding balls) it creates friction.

Soloha48 [4]3 years ago
4 0
There is an unbalanced force on the book caused by friction.
If there was no friction, the book would continue to slide.
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Answer:

the wax melts

Explanation:

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2 years ago
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Ammonia, nh3, is a weak base with a kb = 1.8 x 10-5. in a 0.8m solution of ammonia, which has a higher concentration: ammonia (n
insens350 [35]
Answer is: concentration ammonia is higher than concentration of ammonium ion.
Chemical reaction of ammonia in water: NH₃ + H₂O → NH₄⁺ + OH⁻.
Kb(NH₃) = 1,8·10⁻⁵.
c₀(NH₃) = 0,8 mol/L.
c(NH₄⁺) = c(OH⁻) = x.
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7 0
3 years ago
Compound A is an organic compound which contains Carbon, Hydrogen and Oxygen. When 0.240g of the vapour of A is slowly passed ov
vesna_86 [32]

(a)   In this section, give your answers to three decimal places.

(i)

Calculate the mass of carbon present in 0.352 g of CO

2

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Use this value to calculate the amount, in moles, of carbon atoms present in 0.240 g

of

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(ii)

Calculate the mass of hydrogen present in 0.144 g of H

2

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Use this value to calculate the amount, in moles, of hydrogen atoms present in 0.240 g

of

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(iii)

Use your answers to calculate the mass of oxygen present in 0.240 g of

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Use this value to calculate the amount, in moles, of oxygen atoms present in 0.240 g

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thank you

hope it helpsss

4 0
3 years ago
Consider the balanced reaction: 4Ga(s) + 3O2(g)⟶ 2Ga2O3(s)
Paha777 [63]

First we need to find the number of moles that 43.9g of gallium metal is. We can do this by finding the molar weight of gallium and cross-multiplying to cancel out units:


\frac{1mole}{69.723g}*\frac{43.9g}{1}=0.63mol_{Ga}


So we are dealing with 0.63 moles of gallium metal.


We can take from the balanced equation that 4 moles of gallium metal will react completely with 3 moles of oxygen gas. We can take this ratio and make a proportion to find the amount of oxygen gas, in moles, that will react completely with 0.63 moles of gallium metal:


\frac{4moles_{Ga}}{3moles_{O_{2}}} =\frac{0.63moles_{Ga}}{xmoles_{O_{2}}}


Cross multiply and solve for x:


4x=1.89


x=0.47moles_{O{2}}


So now we know that 0.47 moles of oxygen gas will react with 43.9g of gallium metal.

5 0
3 years ago
2.107 × 10^24 calculate the number of moles​
bulgar [2K]
2.1070000000000003e+24
3 0
3 years ago
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