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2 years ago

How does the name of CaS differ from the name of CdS?

1 answer:

7 0

The names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)

From the question,

We are to determine the how the name of CaS differ from the name of CdS

First, we will determine the identities of the elements in the given compounds

For CaS

Ca represents calcium

and

S represents sulfur

∴ The compound is named Calcium sulfide

For CdS

Cd represents the element Cadmium

and

S represent the element Sulfur

∴ The compound is named Cadmium sulfide

Hence, the names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)

Learn more here: brainly.com/question/19078303

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How many Joules are released to cool 250.0 grams of liquid water from 100°C to 0°C? The specific heat of water is 4.180 J/g.C.

nlexa [21]

$\bold{\huge{\orange{\underline{ Solution}}}}$

$\bold{\underline{ Given :- }}$

We have 250g of liquid water and it needs to be cool at temperature from 100° C to 0° C
Specific heat of water is 4.180J/g°C

$\bold{\underline{ To \: Find :- }}$

We have to find the total number of joules released.

$\bold{\underline{ Let's \:Begin:- }}$

We know that,

Amount of heat energy = mass * specific heat * change in temperature

That is, 

$\sf{\red{ Q = mcΔT }}$

Subsitute the required values in the above formula :-

$\sf{ Q = 250 × 4.180 ×(0 - 100 )}$

$\sf{ Q = 250 × 4.180 × - 100 }$

$\sf{ Q = 250 × - 418}$

$\sf{\pink{ Q = - 104,500 J }}$

Hence, 104,500 J of heat is released to cool 250 grams of liquid water from 100° C to 0° C.

$\bold{\underline{ Now :- }}$

We have to tell whether the above process is endothermic or exothermic :-

Here, In the above process ΔT is negative and as a result of it Q is also negative that means above process is Exothermic

Exothermic process :- It is the process in which heat is evolved .
Endothermic process :- It is the process in which heat is absorbed .

4 0

2 years ago

How is a compound different from an element 2.3 lesson check?

zavuch27 [327]

Answer:

Element: Element are pure substance consist of same type of atoms
Compound: Form by combination of atoms of different elements.

Distinguish features:

Compounds represented by chemical formula while elements are represented by symbols.
Compounds have fixed ratios of atoms of different elements while in elements are distinguished by atomic no.
Compounds can be converted into simple substance by chemical methods but the elements cant be converted into simpler substance by means of chemical methods.

Example:

Water (H2O) is a compounds.
Iron (Fe) is an element.

Summary:

When two or more elements are mixed then compounds are formed.

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3 years ago

When Silver (Ag) forms a metallic bond with other Silver atoms, what do the valence electrons move into? A. the all go to the sa

Korolek [52]

Answer:

D. the sea of electrons

Explanation:

Metallic bonds are defined as the bonds formed between two or more metals. Silver atom form metallic bond with other silver atoms.

In metallic bond, the free electrons or valence electrons present in s and p orbitals delocalize. The valence electrons do not move around the atoms or enter the atoms whereas they form a sea of electrons in which they surround the nuclei (positively charged) of the metal ions interacting. The valence electrons are then freely move in the space between the atomic nuclei.

Hence, the correct answer is "D. the sea of electrons".

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4 years ago

Saturated hydrocarbons are major components of

cupoosta [38]

Answer:

gasoline

Explanation:

....................

4 0

3 years ago

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An unknown compound has a percent composition of 52.10% potassium, 15.8% carbon, and 32.1% oxygen. The molar mass of the compoun

Dmitry [639]

1) You will need to use the atomics masses of the elements. So list them:

K: 39 g/mol
C: 12 g/mol
O: 16 g/mol

2) Your base is 100 grams, so you have:

K: 52.1 g
C: 15.8 g
O: 32.1 g

3) Convert grams to moles (dividing each element by its atomic mass)

K: 52.10g / 39 g/mol = 1.336 mol
C: 15.8 g / 12 g/mol = 1.317 mol
O: 32.1 g / 16 g/mol = 2.006 mol

4) Divide all the mol numbers by the least mol number:

K: 1.336 / 1.317 = 1.01
C: 1.317 / 1.317 = 1.00
O: 2.006 / 1.316 = 1.52

5) To have only whole numbers multiply by 2 and round to the nearest whole number

K = 2
C = 2
O = 3

So the empirical formula is K2C2O3

6) Find the molar mass of the empirical formula:

2*39 + 2*12 + 3*16 = 150.

7) Find the number of times that the molecular formula containd the mass of the empirical formula:

150 / 150.22 = 1

Then the molecular formula is the same empirical formula.

Answer: K2C2O3.

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3 years ago

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