A student performs an experiment to study how sound waves are transmitted by placing a ringing buzzer inside a bell jar and sealing the jar. The student then connects the bell jar to a vacuum pump to remove the air from inside of the jar. The table shows the student’s observations before and after removing the air from the bell jar.


What can be concluded from the experiment?

A. Sound waves are transverse waves.

B. Sound waves do not transmit through material mediums.

C. Sound waves do not carry energy when they are transmitted.

D. Sound waves transfer energy through the vibration of particles in mediums.

Answer:

-3

Explanation:

The charge of the ion is determined by the number of protons and the number of electrons.

Protons are a positive + charge.

Electrons are a negative - charge.

We have 7 protons and 10 electrons.

+7 charge

-10 charge

-10 + 7 = -3 charge

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass of iron (II) oxide = 76.6 g

volume = 12 mL

We have

[tex]density = \frac{76.6}{12} \\ = 6.3833333...[/tex]

We have the final answer as

Hope this helps you

Answer:

it 76.6

Explanation:

cause it is what it is

Answer/Explanation:

Tentative means that something is uncertain. So if some aspect of science is described as "tentative" it probably means that there is some evidence to support a hypothesis, but there is more work to be done to be sure about the statements being made.

You may also see these reports described as "preliminary", as they are acknowledging the work is not complete

Answer:

Chlorine can be found in abundance in both the Earth's crust and in ocean water. In the ocean, chlorine is found as part of the compound sodium chloride (NaCl), (table salt). In the Earth's crust, the most common minerals containing chlorine include halite (NaCl), carnallite, and sylvite (KCl).

Chlorine can be found in abundance in both the Earth's crust and in ocean water

Answer: energy

Explanation:hope this helps.

Answer:

Temperature

Explanation:

Answer:

Should be Mercury.

Explanation:

The atmospheres of the terrestrial planets range from thin to thick. Mercury has almost no atmosphere.

Given parameters:

Density of the rock = 2.2g/cm³

Volume of rock = 66.5mL

Unknown:

Mass of the rock = ?

Solution:

Density is the mass per unit volume of a body. It is mathematically expressed as shown below;

          Density  = [tex]\frac{mass}{volume}[/tex]

So;

         Mass = Density x Volume

We need to take the given parameters to the same unit before we solve;

              convert mL to cm³

                 1mL  = 1cm³;  66.5mL is the same as 66.5cm³

Now solve;

          Mass  = 2.2 x 66.5  = 146.3g

The mass of the rock is 146.3g

Answer:

2.7 moles of neon contain 16.3 × 10²³ atoms of neon.

Explanation:

Given data:

Number of moles of neon = 2.7 mol

Number of atoms of neon = ?

Solution:

We will use using Avogadro number to solve given problem.

"It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance"

The number 6.022 × 10²³ is called Avogadro number.

1 mole of neon = 6.022 × 10²³ atoms of neon

2.7 mole of neon × 6.022 × 10²³ atoms of neon / 1 mole of neon

16.3 × 10²³ atoms of neon

Thus, 2.7 moles of neon contain 16.3 × 10²³ atoms of neon.

Answer:

F

Explanation:

has 7 valence electrons , it really want to hog another electron to reach an octet.

therefore it has a highest electronegativity

Answer:

D.

Explanation:

I looked it up and said increases, i'm taking a test today in chemistry and had the same question lol.

Answer: Neutrons

Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

Answer:

neutrons

Explanation:

isotopes has the same proton number but different nucleon number because there's different numbers of neutrons in isotopes

Answer:

it s not on periodic table this is not real element

Explanation:

Answer:

Talc

Explanation:

Talc only has a hardness of one on the Moh's scale of hardness. This translates into a very soft material, which results from its layered nature. Naturally, this substance is hydrophobic (dislikes water), and tends not to absorb water, therefore giving some of its favourable water-resistant characteristics.

Explanation:

B and C they are the pure substances

Elements are considered as  pure substances . Elements are mostly metals, non - metals and metalloids , so option C is right.

An element is a substance that cannot be broken down by non - nuclear reaction. Elements considered as a pure substance . All elements are mostly pure substances. A few of them include gold, copper, oxygen, chlorine, diamond, etc. Compounds such as water, salt or crystals, baking soda amongst others are also grouped as pure substances.

An element is a fundamental item that cannot be easily broken in smaller pieces. There are about 100 elements ,each with it's own types of atom. Everything in universe contain an atom of at least on or more than one elements.

Elements are pure substances ,hence option C is correct.

To learn more about elements refer the following  link;

https://brainly.com/question/14347616

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Answer:

cancerous

Explanation:

Answer:You have it right the answer is c!

Explanation:

Answer:

c ........................!

Answer:

h2s

Explanation:

The closest chemical analogue for water is hydrogen sulphide or H₂S. Because, both oxygen and sulfur are same group elements and shows similar properties.

Hydrogen sulphide or  H₂S is a covalent compound formed by the combination of two hydrogens and one sulphur atoms. In this compound, each hydrogen shares one electron to sulfur and sulfur shares its two valence electrons to each hydrogen.

Water is  H₂O, which is formed by the strong hydrogen bonding between hydrogen and oxygen and it exists as liquid mostly. Most of the compounds can be dissolved in water.

Lithium oxide Li₂O is a covalent compound with partial ionic character and it does not exhibit any similarity with water in any case.

Bothe sulfur and oxygen are in 16th group. They are gases with high electronegativity. Hence, both H₂O, H₂S are polar compounds. Both sulfur and oxygen have affinity towards hydrogen. Both have similar shape and bond angle.

Moreover, H₂S can dissolve some minerals and acts as a good solvent like water.

Hence, the better substitute for water is H₂S.

To find more about H₂S, refer the link :

https://brainly.com/question/20365774

#SPJ2

Answer:

A

Explanation:

With the given choices, A would be correct for this question.  But, both liquids and gases have particles that are far apart so that they can fill their containers.

Answer:

Liquid

Explanation:

The substance had appears to have a fixed volume but took the shape of the bottle it was transferred to.

If the substance doesn't have the same volume, the answer would be gas.

Answer:

5 grams < 9.4 grams < 0.35 kilograms

Explanation:

Kilograms (Kg) and grams (g) are both units of measurement for MASS quantity. However, these units are not the same as they vary in magnitude. The kilograms is bigger unit of measurement than the grams. 1000grams makes 1kilograms.

According to this question, 0.35 kilograms 9.4 grams and 5 grams are to be arranged in ascending order i.e. from smallest to largest. First, we need to change all the units to the same.

We change 0.35kg to g

Since 1000g = 1kg

Then, 0.35kg = 0.35 × 1000

= 350g.

Rearranging the values, we have:

5 grams < 9.4 grams < 0.35 kilograms

Answer:

Diagram of the nuclear composition and electron configuration of an atom of barium-138 (atomic number: 56), the most common isotope of this element. The nucleus consists of 56 protons (red) and 82 neutrons (blue).

Answer:

3 g/cm3

Explanation:

d=m/v

=45/15

= 3 g/cm3

Answer:

2.46621 cm

Explanation:

i used the formula p = m/V

Answer:

there is about 6 zeros in 1,000,000

Answer:

6   0's

Explanation:

happy bday #LibraGurl

Answer:

it is A

Explanation:

Answer:Option D

Explanation:i took the test

Answer:

9.11 x 10 -28 grams

Explanation:

Answer:

It A(Ba3P2)

Explanation:

I took the test

Answer:

It A(Ba3P2)

Explanation:

Answer:

just the second

Explanation:

Answer:

both are changes in state, and both conserve mass. Hope it helps and please have a good day or night