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3 years ago

Give the reason why the empty crucible should be heated before starting the experiment

1 answer:

3 0

To make sure no cracks are in the crucible and also to remove any moisture present in the crucible by the process of heating.

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What is the correct formula that would result from the combination of the two ionic species?

Soloha48 [4]

Answer:

CsCl

Explanation:

The ionic species are:

Cs⁺ and Cl⁻

6 0

2 years ago

If a compound begins with a metal, it most likely is a _______ compound

Bess [88]

Answer:

Metallic compound

Explanation:

Metallic compound -

A metallic compound refers to the species having at least one metal, is known as a metallic compound.

In general a metallic compound consists of two ions, a positive ion or the cation, is is basically a metal, and,

a negative ion or an anion, which is a non - metal.

Hence, from the given statement of the question,

The correct answer is - metallic compound.

8 0

3 years ago

A 4.7g sample of ethanol is burned in a calorimeter containing 95.8 mL of water. If the initial temperature of the water is 29.1

Anna11 [10]

Answer:

Anywhere you go, I'll go

Shadows in the camera light

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Hit you with some truth

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When we're together

I can't even lie

You and me got chemistry

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Feel it when you're close to me

And out of reach

And in between

We got la la la, lots of good vibrations

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You and me got chemistry

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You got my attention now

Can anybody ride my wave the same

You know what I'm talkin' about

Hit you with some truth

You're like a dream

I wanna believe

Hit you with some truth

When we're together

I can't even lie

You and me got chemistry

Got, got chemistry

Got chemistry

Feel it when you're close to me

And out of reach

And in between

We got la la la, lots of good vibrations

We got la la la, we got la la la

You and me got chemistry

Got, got chemistry

Got chemistry

You and me got, you and me got

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Got chemistry

Feel it when you're close to me

And out of reach

And in between

Ohh we got chemistry

Feel it when you're close to me

And out of reach

And in between

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'Cause you and me got

8 0

3 years ago

Salt is poured from a container at 10 cm³ s-¹ and it formed a conical pile whose height at any time is 1/5 the radius of the abo

Romashka-Z-Leto [24]

Answer:

$\displaystyle \frac{dh}{dt} = \frac{1}{10 \pi}$

Explanation:

Volume of a cone:

$\displaystyle V=\frac{1}{3} \pi r^2 h$

We have $\displaystyle \frac{dV}{dt} = \frac{10 \ cm^3}{sec}$ and we want to find $\displaystyle \frac{dh}{dt} \Biggr | _{h\ =\ 6}= \ ?$ when the height is 2 cm.

We can see in our equation for the volume of a cone that we have three variables: V, r, and h.

Since we only have dV/dt and dh/dt, we can rewrite the equation in terms of h only.

We are given that the height of the cone is 1/5 the radius at any given time, 1/5r, so we can write this as r = 5h.

Plug this value for r into the volume formula:

$\displaystyle V =\frac{1}{3} \pi (5h)^2 h$
$\displaystyle V =\frac{1}{3} \pi \ 25h^3$

Differentiate this equation with respect to time t.

$\displaystyle \frac{dV}{dt} =\frac{25}{3} \pi \ 3h^2 \ \frac{dh}{dt}$
$\displaystyle \frac{dV}{dt} =25 \pi h^2 \ \frac{dh}{dt}$

Plug known values into the equation and solve for dh/dt.

$\displaystyle 10 = 25 \pi (2)^2 \ \frac{dh}{dt}$
$\displaystyle 10 = 100 \pi \ \frac{dh}{dt}$

Divide both sides by 100π to solve for dh/dt.

$\displaystyle \frac{10}{100 \pi} = \frac{dh}{dt}$
$\displaystyle \frac{dh}{dt} = \frac{1}{10 \pi}$

The height of the cone is increasing at a rate of 1/10π cm per second.

7 0

3 years ago

How many molecules of h20 contain 2.0 x 10^22 molecules of water?

nasty-shy [4]

Water=h20
=2.0*10^22 molecules

5 0

3 years ago