All categories

2 years ago

How are elements and compounds different?

Chemistry

2 answers:

Nataliya [291]2 years ago

3 0

Answer:

Elements only contain one type of atoms while compounds contain two or more types of atoms.

Explanation:

An example of an element is sodium --> Na (only Na atoms)

An example of a compound can be water --> H2O (contain H and O atoms)

*But the particles within a compound are all the same.

krok68 [10]2 years ago

3 0

No. Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions.

You might be interested in

The Henry's law constant (kH) for O2 in water at 20°C is 1.28 × 10−3 mol/(L·atm). (a) How many grams of O2 will dissolve in 4.00

Burka [1]

Answer:

Solubility of O₂(g) in 4L water = 3.42 x 10⁻² grams O₂(g)

Explanation:

Graham's Law => Solubility(S) ∝ Applied Pressure(P) => S =k·P

Given P = 0.209Atm & k = 1.28 x 10⁻³mol/L·Atm

=> S = k·P = (1.28 x 10⁻³ mole/L·Atm)0.209Atm = 2.68 x 10⁻³ mol O₂/L water.

∴Solubility of O₂(g) in 4L water at 0.209Atm = (2.68 x 10⁻³mole O₂(g)/L)(4L)(32 g O₂(g)/mol O₂(g)) = <u>3.45 x 10⁻² grams O₂(g) in 4L water. </u>

4 0

2 years ago

Can someone easily explain to me how to do reaction rates?

iVinArrow [24]

Explanation:

Reaction rate is a measure of speed of a chemical reaction.

Usually, based on rates, reactions can be divided into two parts:

Slow reactions which usually takes a long time.
Fast reactions which takes place completely in seconds or microseconds.

Reaction rate can be defined as a change in the concentration of a reactant or product per unit time:

The unit is mol dm⁻³ s⁻¹

Reaction rate = $\frac{change in concentration of a reactant and product}{time taken }$

The measurement of the reaction rate is based on the disappearance of a reactant or appearance of a product with increasing reaction time.

Learn more:

Reaction rate brainly.com/question/9642960

#learnwithBrainly

5 0

3 years ago

Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical

Kazeer [188]

Answer:

$2H_2O\rightarrow 2H_2+O_2$

Explanation:

Hello there!

In this case, for the reaction by which water is decomposed to molecular hydrogen and oxygen:

$H_2O\rightarrow H_2+O_2$

It is necessary to perform the inspection balance process since there is a dissimilar number of atoms of oxygen on both sides; therefore, by putting a 2 on water we balance oxygen:

$2H_2O\rightarrow H_2+O_2$

But now, there are four hydrogens on the left; therefore, we put a 2 on hydrogen to finally balance it:

$2H_2O\rightarrow 2H_2+O_2$

And obviously, the coefficient in oxygen is an unwritten 1.

Best regards!

7 0

2 years ago

What is the number of valence electrons in a nitrogen atom in the ground state

ddd [48]

Answer: 5

Explanation:

It just is

6 0

2 years ago

When water was added to a 4.00 gram mixture of potassium oxalate hydrate (molar mass 184.24 g/mol) and calcium hydrate shown bel

Sliva [168]

Answer:

% (COOK)2H2O = 37.826 %

Explanation:

mix: (COOK)2H2O + Ca(OH)2 → CaC2O4 + H2O

∴ mass mix = 4.00 g

∴ mass (CaC2O4)H2O = 1.20 g

∴ Mw (COOK)2H2O = 184.24 g/mol

∴ Mw (CaC2O4)H2O = 146.12 g/mol

∴ r = mol (COOK)2H2O / mol (CaC2O4)H2O = 1

% (COOK)2H2O = (mass (COOK)2H2O / mass Mix) × 100

⇒ mass (COOK)2H2O = (1.20 g (CaC2O4)H2O)×(mol (CaC2O4)H2O / 146.12 g (CaC2O4)H2O)×(mol (COOK)2H2O/mol (CaC2O4)H2O)×(184.24 g (COOK)2H2O/mol (COOK)2H2O)

⇒ mass (COOK)2H2O = 1.513 g

⇒ % (COOK)2H2O = ( 1.513 g / 4 g )×100

⇒ % (COOK)2H2O = 37.826 %

7 0

3 years ago