All categories

2 years ago

State the postulates of Dalton's atomic theory.

2 answers:

4 0

A theory of chemical combination, first stated by John Dalton in 1803. It involves the following postulates: (1) Elements consist of indivisible small particles (atoms). (2) All atoms of the same element are identical; different elements have different types of atom. (3) Atoms can neither be created nor destroyed.

(Brainliest me)

Lelechka [254]2 years ago

3 0

Answer:

<h3>The Postulates of Dalton's Atomic Theory:</h3>

All matter is made of very tiny particles called atoms.
Atoms are indivisible particles which cannot be created or destroyed in a chemical reaction.
Atoms of given element are identical in mass and chemical properties.
Atoms of different elements have different masses and chemical properties.
Atom combine in the ratio of small whole numbers to form compounds.
The relative number and kinds of atoms are constant in a given compound.

-TheUnknownScientist 72

You might be interested in

How many valence electrons are in an atom of magnesium?

dimulka [17.4K]

There are two valence electrons in a single atom of magnesium.

8 0

3 years ago

Read 2 more answers

2. Explain what an isotope is and give two important physical properties of isotopes that make them useful in biological researc

katrin [286]

Answer:

<h2>isotope is a variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.All isotopes of a given element have the same number of protons but different number of neutrons in each atom.</h2>

<h2>The 2 important physical properties of isotope is</h2>

<h2>1.Melting Points</h2><h2>2.Boiling Points</h2>

8 0

3 years ago

What is a metal and a non metal

Mrac [35]

Answer:

I assume you mean as in elements

A metal "A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically malleable or ductile." (wiki)

a non-metal "In chemistry, a nonmetal is a chemical element that mostly lacks the characteristics of a metal. Physically, a nonmetal tends to have a relatively low melting point, boiling point, and density. A nonmetal is typically brittle when solid and usually has poor thermal conductivity and electrical conductivity." (wiki)

Explanation:

5 0

3 years ago

Read 2 more answers

Heating a carboxylic acid with a primary amine forms water along with what organic product? OA) A secondary amide OB) A primary

Bezzdna [24]

Answer:

A) secondary amide

Explanation:

When carboxylic acid reacts with a primary amine, a condensation reaction takes place with the elimination of a water molecule .

For example, ethanol reacts with methylamine which is a primary amine gives N-Methylacetamide and a water molecule as:

$CH_3COOH+NH_2CH_3\rightarrow CH_3-CONH-CH_3+H_2O$

The bond formed which is

-- C ---NH ---

is known as secondary amide group as only one hydrogen is attached to nitrogen atom in the amide bond.

5 0

3 years ago

Need help please it must be right thank u

vova2212 [387]

Answer:

13. c) Net

14. a) Gravity

15. d) Watt

16. b) the speed will suddenly decrease.

Explanation:

13. The net force is combination of all individual forces.

14. When we sit on the chair , then gravitational force acts on our body due to our mass.

F = mg

here, F = force due to gravity , g = acceleration due to gravity and m= mass of the body

15.Power : It is the force acting per unit area .It is discovered by James Watt

$Power =\frac{force}{area}$

$Power =\frac{N}{m^{2}}$

Its unit is $Nm^{-2}$ .In honor of the Scientist , its unit is Watt.

Watt = $Nm^{-2}$

16. When the parachute first opens , the speed of the skydiver suddenly decreases because of the resistance offered by the air particles.(For more details look at the figure attached)

17. Transfer of momentum from one object to other is the law of conservation of momentum (NOT ENERGY).So the answer is False

 Law of Conservation of Momentum :  Total momentum of a system is conserved if no external force attack on it. Momentum can neither be created nor destroyed but transferred from one form to other.

7 0

3 years ago

State the postulates of Dalton's atomic theory. ​

State the postulates of Dalton's atomic theory.