when sodium reacts with gold (III) chloride, gold metal and sodium chloride are formed. Balanced the equation and classify it

Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in ye

Dmitrij [34]

It will take 497.67 years to decay.

What is half-life ?

The duration needed for a quantity to decrease to half of its initial value is known as the half-life. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last. The phrase is also used more broadly to describe any kind of exponential decay (or, very infrequently, nonexponential decay). The biological half-life of medications and other compounds in the human body, for instance, is a term used in the medical sciences. Half-opposite life's in exponential growth is time's doubling.

The formula

At = (Ao)(0.5)(t/h)

where Ao is the initial amount determines the amount of material at a specific time t, At, with a half-life of h.

At/Ao = 0.45 from the stated results in (0.5)(t/432).

T in the equation has a value of 497.67 years.

To learn more about half-life click on the link below:

brainly.com/question/19500804

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3 0

2 years ago

Check out this long-form version of the periodic table. It shows where the two rows of

MatroZZZ [7]

Answer:

The long form version is too wide to easily fit on a computer screen or sheet of paper

Explanation:

8 0

3 years ago

Determine the kinetic energy of an 833.0 kg roller coaster car moving at a speed of 20.0 m/s

trasher [3.6K]

Answer:

166,600J

Explanation:

Kinetic energy (K.E), which is the energy due to motion of a body, can be calculated by using the formula;

K.E = 1/2 × m × v²

Where;

K.E = kinetic energy (joules)

m = mass of body (kg)

v = speed or velocity (m/s)

According to this question, the mass of the roller coaster is 833.0 kg while its velocity/speed is 20.0m/s.

K.E = 1/2 × 833 × 20²

K.E = 1/2 × 833 × 400

K.E = 1/2 × 333200

K.E = 166,600

Therefore, the kinetic energy of the roller coaster car is 166,600J.

6 0

3 years ago

1220 pounds / 1.45 inches =? What do you get when you quadruple 22.34 cm?

Brilliant_brown [7]

(a) 841 lb/in; (b) 89.36 cm

(a) 1220 lb/1.45 in = 841 lb/in

(b) To quadruple a measurement is to multiply it by 4.

∴ 4 × 22.34 cm = 89.36 cm

8 0

4 years ago

Attem A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 9

monitta

Answer: The mass of solid is 105.4 g

Explanation:

To calculate the density of a substance, we use the equation"

$\text{Density of a substance}=\frac{\text{Mass of a substance}}{\text{Volume of a substance}}$ .......(1)

For liquid:

Mass of liquid = 26.6 g

Density of liquid = 0.865 g/mL

Putting values in equation 1, we get:

$0.865g/mL=\frac{26.6g}{\text{Volume of liquid}}\\\\\text{Volume of liquid}=\frac{26.6g}{0.865g/mL}=30.8mL$

We are given:

Volume of solid + Volume of liquid = 91.0 mL

Volume of liquid = 30.8 mL

So, volume of solid = 91.0 - 30.8 = 60.2 mL

Now, calculating the mass of solid by using equation 1, we get:

Volume of solid = 60.2 mL

Density of solid = 1.75 g/mL

Putting values in equation 1, we get:

$1.75g/mL=\frac{\text{Mass of solid}}{60.2mL}\\\\\text{Mass of solid}=(1.75g/mL\times 60.2mL)=105.4g$

Hence, the mass of solid is 105.4 grams

7 0

3 years ago