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3 years ago

According to John Dalton’s observations when elements combine in a compound

Physics

2 answers:

Andrej [43]3 years ago

6 0

Answer: When elements combine in a compound, the ratio of their masses is always the same

Explanation:

Dalton's theory is based on mainly two laws:

Law of conservation of mass
Law of constant composition.

Law of conservation of mass states that mass can neither be created nor be destroyed, but it can transformed from one form to another form.

Law of constant composition states that a compound always contain the elements in the fixed ratio by their masses.

For Example: In water $(H_2O)$ , the hydrogen and oxygen are present in the fixed ratio of 1 : 9 by their mass.

Hence, when elements combine in a compound, the ratio of their masses is always the same

gayaneshka [121]3 years ago

3 0

The answer is A.) The ratio of thier masses is always the same

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Think of a mole of plutonium-239 (molar mass: 239 grams) as a mole of "reactions."

Energy used in the US per person annually = 3-5 X 1011
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2 years ago

What are three (3) things you can do before exercise or sports that will keep you safe?

zaharov [31]

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Explanation:

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3 years ago

An object is 50 cm from a converging lens with a focal length of 40 cm . A real image is formed on the other side of the lens, 2

Leno4ka [110]

Answer:

d) -4.0

Explanation:

The magnification of a lens is given by

$M=-\frac{q}{p}$

where

M is the magnification

q is the distance of the image from the lens

p is the distance of the object from the lens

In this problem, we have

p = 50 cm is the distance of the object from the lens

q = 250 cm - 50 cm is the distance of the image from the lens (because the image is 250 cm from the obejct

Also, q is positive since the image is real

So, the magnification is

$M=-\frac{200 cm}{50 cm}=-4.0$

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3 years ago

A dragster starts with zero velocity and completes a 404.5 m (0.2528 mile) run in 4.922 s. If the car had a constant acceleratio

KIM [24]

Answer:

a. a=33.34ms⁻², V=164.4m/s

Explanation:

Since the dragster started with zero velocity, de determine the acceleration using of the equations of motion.

Below are the data given

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time taken,t=4.922secs

Using the equation

S=ut+1/2at²

where u is the initial velocity and u=0

Making the acceleration the subject of the formula, we arrive at

a=2s/t²

a=(2*404.5)/4.922²

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To determine the velocity, we use

V=u+at

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3 years ago

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2 years ago