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3 years ago

Need help on question 3 plz URGENT HELP PLZ

Chemistry

1 answer:

Law Incorporation [45]3 years ago

5 0

Alloys are the homogeneous mixture of metals and non metals.... they are used in making cars and jewellery to make them more featurable,,, means that they would possess high regidity to the destruction .... both features of metal and nonmetal

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Plz help I need help plz ASAP

snow_lady [41]

6:c

7: might be ice but im not really sure, hope you do well.

Explanation:

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3 years ago

How does magnification occur in an electron microscope?

Nady [450]

An electron beam makes the object become larger.

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3 years ago

Read 2 more answers

What will be the theoretical yield of tungsten(is) ,W, if 45.0 g of WO3 combines as completely as possible with 1.50 g of H2

Anarel [89]

Answer:

35.6 g of W, is the theoretical yield

Explanation:

This is the reaction

WO₃ + 3H₂ → 3H₂O + W

Let's determine the limiting reactant:

Mass / molar mass = moles

45 g / 231.84 g/mol = 0.194 moles

1.50 g / 2 g/mol = 0.75 moles

Ratio is 1:3. 1 mol of tungsten(VI) oxide needs 3 moles of hydrogen to react.

Let's make rules of three:

1 mol of tungsten(VI) oxide needs 3 moles of H₂

Then 0.194 moles of tungsten(VI) oxide would need (0.194 .3) /1 = 0.582 moles (I have 0.75 moles of H₂, so the H₂ is my excess.. Then, the limiting is the tungsten(VI) oxide)

3 moles of H₂ need 1 mol of WO₃ to react

0.75 moles of H₂ would need (0.75 . 1)/3 = 0.25 moles

It's ok. I do not have enough WO₃.

Finally, the ratio is 1:1 (WO₃ - W), so 0.194 moles of WO₃ will produce the same amount of W.

Let's convert the moles to mass (molar mass . mol)

0.194 mol . 183.84 g/mol = 35.6 g

3 0

3 years ago

A block is pulled 0.90 m to the right in 2.5 s.

Blizzard [7]

The block’s average speed : 0.36 m/s

<h3>Further explanation</h3>

Distance is the length traveled by an object within a certain of time .

Average speed = total distance/total amount of time ,

Can be formulated :

$\tt avg.s(speed)=\dfrac{\Delta D}{\Delta t}$

ΔD= total distance

Δt= total time

A block is pulled 0.90 m to the right in 2.5 s :

ΔD= total distance = 0.9 m

Δt= total time = 2.5 s

The block’s average speed :

$\tt avg.s=\dfrac{0.9}{2.5}=0.36~m/s$

7 0

3 years ago

Please help me with all the questions and needs to be right thank u

murzikaleks [220]

Answer:

7. b

8. d

9. c

10. c

11. d

Explanation:

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3 years ago