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3 years ago

Compare the mass number and atomic number for isotopes of an element

1 answer:

3 0

An isotope is when there is same amount of atomic number but different mass number. It also mean that only the number of neutrons changes if there is an isotope present.

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Be sure to answer all parts. Carbon disulfide, a poisonous, flammable liquid, is an excellent solvent for phosphorus, sulfur, an

sveticcg [70]

Explanation:

Experiment Initial [CS2] (mol/L) Initial Rate (mol/L·s)

1 0.100 2.7 × 10−7

2 0.080 2.2 × 10−7

3 0.055 1.5 × 10−7

4 0.044 1.2 × 10−7

a) Choose the rate law for the decomposition of CS2.

Comparing equations 1 and 3, reducing the initial concentration by almost half (from 0.100 to 0.055) leads too the rate of reaction to be reduced by almost half (from 2.7 × 10−7 to 1.5 × 10−7).

This signifies that the reaction is a first order reaction.

Rate = k [CS2]

(b) Calculate the average value of the rate constant.

Taking equation 1.

Rate = k [CS2]

k = Rate / [CS2]

k = 0.100 / (2.7 × 10−7) = 0.037 x 10^8 = 3.7 x 10^6s-1

4 0

3 years ago

Which of the following halogens has the largest atomic radius?

pickupchik [31]

Answer:

$\boxed {\boxed {\sf B. \ Iodine }}$

Explanation:

Atomic radius is the measurement from the nucleus to the outer edge of the electron cloud.

As you go down a group (vertically) the atomic radius increases because more electron shells are added. As you go across a period horizontally, the atomic radius decreases.

If we look at the halogens group (17), we see they follow this order from top to bottom:

F - Fluorine

Cl - Chlorine

Br - Bromine

I - Iodine

Since it increases down the group, iodine must have the largest atomic radius.

4 0

3 years ago

33. Hydrocarbons that release pleasant odors are called_________ hydrocarbons. (1 point)

olya-2409 [2.1K]

Answer:

Aromatic Hydrocarbons

Explanation:

Aromatic (Pleasant Odour) Hydrocarbons are those having pleasant odours.

8 0

3 years ago

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The total number of valence electrons in the phosphate ion is

Vitek1552 [10]

Answer:

Step-by-step explanation:

There are two ways you can count the valence electrons.

A. From the Periodic Table

1 × P (Group 15) = 5

4 × O (Group 16) = 4 × 6 = 24

+3 e⁻ (for the charges) = 3

Total = 32

B. From the Lewis structure

In the Lewis structure (below), each line (bond) represents a pair of bonding electrons, and each dot represents an unbound electron (half a lone pair).

5 lines (bonds) = 5 × 2 = 10

3 single-bonded O atoms = 3 × 6 = 18

1 double-bonded O atom = 4

Total = 32

4 0

4 years ago

Could someone help me please?

sergey [27]

Answer:

2,4,2

Explanation:

by looking at the subscripts (small number behind the element) you can tell how many of these atoms are presented in the compound.

your compound is C2H4O2

so there are two carbon atoms present, four hydrogen atoms present, and 2 oxygen atoms present.

hope this helps :)

8 0

3 years ago

Read 2 more answers