Solid potassium fluoride decomposes into fluorine gas and solid potassium .

If a compound containing only magnesium and oxygen consists of 0.564 g mg and 0.376 g o, what is the compound's empirical formul

jasenka [17]

the Empirical formula of the compound is calculated as follows

find the moles of each element
moles = mass/molar mass

that is Magnesium= 0.564 g /24 g/mol = 0.0235 moles

For oxygen = 0.376 g /16 g/mol= 0.0235 moles
find the mole ratio by dividing both moles of by 0.0235 moles

magnesium = 0.0235/0.0235= 1mole
oxygen= 0.0235 /0.0235= 1mole

therefore the empirical formula = MgO

3 0

3 years ago

Antibodies, which are produced by your immune system to search for infections, are made of

Fofino [41]

When the body senses foreign substances (called antigens), the immune system works to recognize the antigens and get rid of them. B lymphocytes are triggered to make antibodies (also called immunoglobulins). These proteins lock onto specific antigens.

4 0

3 years ago

A scientist observed a sample of an unknown material. His observations are shown.

Vikentia [17]

The physical state that best describes the scientist's sample is solid (option C).

<h3>What are the states of matter?</h3>

Matter refers to any substance that has mass and occupies space. The states of matter are as follows;

Solids; a substance in the fundamental state of matter that retains its size and shape without need of a container.
Gases; a matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid
Liquids; substance that is flowing such as water; Liquids readily change their relative position, and which therefore retains no definite shape, except that determined by the containing receptacle.

According to this question, a scientist observed a sample of an unknown material to have molecules that are packed closely together and have fixed positions in space relative to each other. It has resistance to deformation and change of volume.

This description best fits the solid state of matter.

Learn more about solids at: brainly.com/question/14237862

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1 year ago

Question 10 of 25

Over [174]

Answer: 0

Explanation: A P E X

5 0

3 years ago

Read 2 more answers

Two electrons are found in the same atom. One has the quantum number set (3, 2, 0, +?), and the other has the quantum number set

Vilka [71]

D. Same energy level but different sublevel.

<h3>Explanation</h3>

There are four quantum numbers [1]:

n, the principal quantum number,
l, the orbital angular momentum quantum number,
 $m_l$ , the magnetic quantum number, and
$m_s$ , the electron spin quantum number.

As their names might suggest:

n determines the main energy level of an electron.
l determines the type of sublevel of an electron.
Each sublevel might contain more than one orbital. $m_l$ gives the orbital of an electron.
Each orbital contains up to two electrons. $m_s$ tells two electrons in the same orbital apart.

The two electrons in question come from the same atom. The question suggests that they have the same n, $m_l$ , and $m_s$ . As a result, both electrons are in main energy level n = 3. They share the same spin.

However, the two electrons differ in their value of l.

l = 2 for the first electron. It belongs to a d sublevel.
l = 1 for the second electron. It belongs to a p sublevel.

<h3>Reference</h3>

[1] Kamenko, Anastasiya, et. al, "Quantum Numbers", Physical & Theoretical Chemistry, Chemistry Libretexts, 24 Mar 2017.

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4 years ago