Please answer this it’s due tomorrow I’ll give you brainliest

Answer:

cilicon 14

Explanation:

Use this formula: Density = Mass/Volume

Given in the question:

Mass: 10g

Volume: 5cm3

The calculations:

Density = Mass/Volume

= 10/5

= 2g/[tex]cm^{3}[/tex]

Therefore, the density will be 2g/[tex]cm^{3}[/tex]

Answer:

Answer:

Matter can be classified according to

physical and chemical properties. Matter is anything that occupies space and has mass. The three states of matter are solid, liquid, and gas. ... Pure substances can be either chemical compounds or elements.

Answer:

Iron's atomic number is 26

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density = 0.79 g/mL

1 L = 1000 mL

6.5 L = 6500 mL

We have

mass = 0.79 × 6500

We have the final answer as

Hope this helps you

Answer:

See explanation

Explanation:

The oxides or hydrides are formed by exchange of valency between the two atoms involved. The group of the atom bonded to oxygen or hydrogen in the binary compound can be deduced by considering the subscript attached to the oxygen or hydrogen atom.

Now let us take the journey;

R2O3- refers to an oxide of a group 13 element, eg Al2O3

R2O - refers to an oxide of group a group 1 element e.gNa2O

RO2 - refers to an oxide of a group 14, 15 or 16 element such as CO2, NO2 or SO2

RH2 - refers to the hydride of a group 12 element Eg CaH2

R2O7 - refers to an oxide of a group 17 element E.g Cl2O7

RH3- refers to a hydride of a group 13 element E.g AlH3

Answer:

36.44 g of He

Explanation:

To convert from moles to grams, you simply multiply by the atomic mass. The conversion table looks like the following:

[tex]\frac{9.11 mol}{1}[/tex] * [tex]\frac{4.00 g}{1 mol}[/tex]

The mol units then cancel, and you are left with 36.44 g of Helium.

Answer:

2=2.28*10^5

3=3.98*10^3

4=5.76*10^3

Answer:B

Explanation:

Heat boils it will get hot no heat/cold will freeze

Answer:

your  Answer is The first one, Its A,  resercher/ fact checker

Explanation:

Answer:

An atom is a basic unit of a chemical element, such as hydrogen, helium ... a fluorine atom since the three additional protons the fluorine has will pull its ... As an example, potassium (K) has a larger average atomic radius (

Explanation:

Sometimes it is necessary to put forth new theories to explain experimental results, Explanation:

Creativity is important to science because sometimes, it is necessary to put forth new theories to explain experimental results. Theories are explanation of scientific observations.

Answer: Without creativity, it would be difficult to come up with new methods to answer scientific questions, meaning we likely wouldn't learn anything new.​

Explanation: took the quiz

Answer:

The answer is C.

Explanation:

By the Law of conservation of mass, when a element, or product undergoes a physical change, mass always stays the same.

Hope you have a good day.

During physical change the mass of the material remains conserved. The correct option is C.

Even before to and after a physical change, the material implicated is unique architectural the same.

Physical changes include texture, shape, heat, and the beginning of a change in the state of matter. The texture of a substance influences how it feels.

A physical change is simply a change in appearance. The situation has not changed since the change.

Physical change can be seen in the use of cutting paper, melting butter, dissolving salt in water, and breaking glass.

Mass is neither created nor destroyed in chemical or physical changes, according to the law of conservation of mass.

Physical changes occur when the phage of a substance changes without changing its chemical composition.

Thus, the correct option is C.

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Answer:

D. O

_________________________________

F ----------¢ - 1

Ne --------¢ 0

Ca --------¢ + 2

Answer:

D. O

Explanation:

Answer:

In Australia, it's warmer than most of the United States during winter.

Explanation:

Answer:

[tex]4.7 * 10^{-7} meters[/tex]

Explanation:

Angstrom can be defined as a metric unit of length for used for the measurement of the wavelength of light (optics) such as visible light, x-rays, ultraviolet light, gamma rays etc. The symbol for Angstrom is "A" and it is named after the 19th century physicist from Sweden, named Anders Jonas Angstrom.

Given the following data;

Wavelength of spectral line = 4700A

To convert this value to meters;

One Angstrom is mathematically equal to [tex] 10^{-10} meters [/tex]

[tex] 1 Angstrom = 10^{-10} meters[/tex]

[tex] 4700 Angstrom = X \; meters[/tex]

Cross multiplying, we have;

[tex] X = 4700 * 10^{-10}[/tex]

X =  [tex]4.7 * 10^{-7} meters[/tex]

Therefore, 4700A is equal to 4.7e-7 or 0.00000047 meters.

Answer:

one valence electron

Explanation:

Each hydrogen atom has one valence electron and is univalent.

Answer:

Argon has 8 valence electrons making it non reactive.

Explanation:

Reactive chemicals are store in containers filled with Argon gas because the argon gas is non reactive. This is true because the argon gas has completely filled octet structure.

This can further be explained by writing the electronic configuration of argon.

The electronic configuration of argon is given below:

Ar (18) => 1s² 2s²2p⁶ 3s²3p⁶

Valence electron => 3s²3p⁶ = 2 + 6 = 8

From the above illustration, we can see that the outermost shell (i.e 3s²3p⁶) is having 8 electrons indicating that it is completely filled as the maximum number of electrons any shell can accommodate outside the first shell is 8 electrons. Thus, argon has 8 valence electrons ( i.e electrons in the outermost shell) and hence it is non reactive as the outermost shell is completely filled.

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.

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Answer:

it is A

Explanation:

Answer:

Exothermic

Explanation:

Exothermic reactions release heat, endothermic absorb heat, and precipitate is a solid formed from a solution

Answer:

B.

Explanation:

Gives off heat,.

Answer: Here are some examples!

Explanation: An example of a series circuit is a string of Christmas lights. If any one of the bulbs is missing or burned out, no current will flow and none of the lights will go on. Parallel circuits are like the smaller blood vessels that branch off from an artery and then connect to a vein to return blood to the heart.

anywhere inside ur house lma.o.

Answer:

Cell

A cell is the smallest unit of a living thing. Cells are the basic building blocks of all organisms

Answer:

1. Metals

2. Metaloids

3. Non-Metals

4. Alkali Metals

5. Transition Metals

6. Halogens

7. Noble Gases

Answer:

c

Explanation:

if you need explanation, ask freely