All categories

3 years ago

I need help I’ll give you brainliest

Chemistry

2 answers:

FinnZ [79.3K]3 years ago

6 0

Pretty sure it’s 3 otherwise idk

Svetlanka [38]3 years ago

5 0

Answer:

2 or 3 i think

Explanation:

You might be interested in

the atomic mass of chlorine is 35.45 u. Is it possible for any single atom of chlorine to have a mass number of exactly 35.45? E

KonstantinChe [14]

No, this number is the result of the natural mixture of Cl-35 and Cl-37, which produces the observed value.

The mass of Cl on the periodic table is 35.45 atomic mass units. This is an average mass of the isotopes (different Cl atoms in nature). Most Cl atoms in nature have a relative mass of about 35 atomic mass units. Most of the remaining Cl isotopes have a relative mass of 37 atomic mass units.

8 0

3 years ago

Use the given molar solubilities in pure water to calculate ksp for each compound. part a bacro4; molar solubility =1.08×10−5m

Margaret [11]

When BaCrO4 dissolves, it dissociates like this: BaCrO4 (s) --> Ba2+ + CrO42-

The expression for Ksp is [Ba2+] x [CrO42-]

There is a 1:1 molar ratio between the BaCrO4 that dissolves and Ba2+ and CrO42- that are in solution. This means that, when 1.08×10⁻⁵ moles per liter of BaCrO4 dissolves, it produces 1.08×10⁻⁵ mol/L of Ba2+ and 1.08×10⁻⁵ of CrO42-. So, applying the expression:

Ksp = (1.08×10⁻⁵ ) x (1.08×10⁻⁵ )
= 1.166 x 10⁻¹⁰

5 0

4 years ago

Two posssible lewis structures for the molecule ch2s are given. determine the formal charge on each atom in both structures

jok3333 [9.3K]

The formal charge on each atom can be known by counting up the number of valence electrons that is present on each atom.

<h3>What is Lewis structure?</h3>

The term Lewis structure is the representation of a compound using its symbols and showing the valence electrons as dots. This question is incomplete as the Lewis structures were not shown.

If it is shown, we can know the formal charge on each atom by counting up the number of valence electrons that is present on each atom.

Learn more about Lewis structure: brainly.com/question/4144781

8 0

2 years ago

Various plant and animal species are on the verge of extinction.

olga2289 [7]

Answer:

1: A.) adapted

2: A.) habitat destruction

Explanation:

Some (few) animals are capable of adjusting their behaviors in relation to human activity and the changes humans make in their habitat. Most are so well adapted to the details of their habitat that they are incapable of surviving when those details change.

"Because all organisms are adapted to their native habitat, human activities that result in habitat destruction are a major reason for their extinction."

_____

Comment on human activities

My friendly local rodent exterminator observed that rodent activity has picked up substantially, since so much human activity has been curtailed by quarantine orders.

3 0

4 years ago

A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is

MArishka [77]

Answer:

1577 °C

Explanation:

Step 1: Calculate the volume of the cylinder

The diameter of the base (d) is 13.0 cm and the height (h) is 15.6 cm. We will use the following expression.

V = h × π × (d/2)²

V = 15.6 cm × π × (13.0 cm/2)² = 8.28 × 10³ cm³ = 8.28 × 10³ mL = 8.28 L

Step 2: Calculate the moles of BF₃

We have 0.0985 kg (98.5 g) of BF₃, whose molar mass is 67.81 g/mol.

98.5 g × 1 mol/67.81 g = 1.45 mol

Step 3: Convert 2.70 MPa to atm

We will use the conversion factor 1 MPa = 9.86923 atm.

2.70 MPa × 9.86923 atm/1 MPa = 26.6 atm

Step 4: Calculate the maximum safe operating temperature

We will use the ideal gas equation.

P × V = n × R × T

T = P × V / n × R

T = 26.6 atm × 8.28 L / 1.45 mol × (0.0821 atm.L/mol.K) = 1850 K

We can convert 1850 K to Celsius using the following expression.

°C = K - 273.15 = 1850 K - 273.15 = 1577 °C

7 0

3 years ago