Which is it , if you are right I will give brainliest

Answer:

heating point for water - 100°

The melting point (MP) of a substance is the temperature at which it melts. A solid's melting point is a physical characteristic that can be used to identify a substance. Here the correct option is B.

The melting point of a solid is the temperature at which it begins to liquefy. A substance's normal melting point is its melting point under atmospheric pressure. Ice often melts at 0 degrees Celsius.

A physical process called melting or fusing causes a substance to change its phase from a solid to a liquid. This happens when the solid's internal energy rises, usually as a result of heat or pressure being applied, which raises the substance's temperature to the melting point.

Thus the correct option is B.

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Answer:

it is A

Explanation:

Answer:

one valence electron

Explanation:

Each hydrogen atom has one valence electron and is univalent.

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:

1. Metals

2. Metaloids

3. Non-Metals

4. Alkali Metals

5. Transition Metals

6. Halogens

7. Noble Gases

Answer:

Iron's atomic number is 26

Explanation:

Answer:

C-

Ionic

Explanation:

Just did the quiz

The bonding occurs between the valence electron of an atom. The ionic bond involves the transfer of electrons between atoms. Thus, option c is correct.

A chemical bond that involves the complete transfer of electron/s from one element to another in a molecule or compound is an ionic bond.

The ionic bonds comprise cations that gave the electron to another element called the anion that gained or accepted the electron. This results in an attractive force between them to form a bond.

The positive and negative charges attract one another which leads to the formation of the ionic bond. The most common example is NaCl in which sodium has a positive and chloride has a negative charge.

Therefore, option c. ionic bond involves the transfer of electrons.

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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:

O

2−

:

Explanation:

The atomic number of O=8=number of electrons

Number of electrons in O

2−

are 8+2=10

Electronic configuration will be 1s

2

2s

2

2p

6

Answer:

124.586

Explanation:

A non-renewable also know as a finite resources are those resources whose availability is limited and can diminish is not used in a proper manner.

Eg:- fossil fuels, crude oil/petroleum, natural gas, and nuclear fuels.

Explanation:

Renewable resources  are those resources that can be repeatedly used and cannot run out of stock as they are naturally replaceable.

Eg:-Wood,Paper,Cotton

Among the options mentioned in the above question steel is not a renewable resource. Steel is made up of iron ,which is mined from the ground.

Brainliest?

The statement is "the steel frame used to make the bike."

A non-renewable resource is one that cannot be replenished by natural processes at a rate fast enough to keep up with use. Carbon-based fossil fuels are an example.

Metals are essential and valuable resources in general. Metals are extremely recyclable and reusable, despite the fact that their natural supply or the supply of components used to make diverse alloys are set.

Steel is created from iron, a nonrenewable resource.

Hence the correct option is A.

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Answer:

A is √34

Explanation:

We can solve for the hypotenuse "A" using the Pythagorean theorem.  

a²+b²=c²

3²+5²=c²

9+25=c²

34=c²

√c=√34

c=√34 --> A

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:

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.

Given parameters:

Volume of the ruby = 575cm³

Density of the ruby = 3.97g/cm³

Unknown:

Mass of the largest ruby = ?

Solution:

Density is the mass per unit volume of a substance. It is an intrinsic property of matter that is unique to each of them.

Mathematically;

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

Since mass is the unknown;

             Mass = density x volume

Input the parameters and solve;

          Mass = 3.97 x 575 = 2282.75g

The mass of the largest ruby is  2282.75g

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:

Density

Explanation:

The ratio of mass to the volume of an object is called its density. Unit of mass is grams and that of volume is mL.

Density = mass/volume

[tex]\text{Density}=\dfrac{\text{grams}}{\text{mL}}\\\\=\text{grams/mL}[/tex]

If you are calculating the grams to mL ratio, it means that we are trying to find the object's density.

Answer:

c

Explanation:

if you need explanation, ask freely

Answer:

For the complete combustion of 10 g of glucose 11.52 g of oxygen is required.

Explanation:

Given data:

Mass of glucose = 10 g

Mass of oxygen required for complete combustion = ?

Solution:

Chemical equation:

C₆H₁₂O₆ + 6O₂    →  6CO₂ + 6H₂O

Now we will convert the given mass of glucose into number of moles.

Number of moles = mass/ molar mass

Number of moles = 10 g/ 180.156 g/mol

Number of moles = 0.06 mol

Now we will compare the moles of glucose with oxygen.

         C₆H₁₂O₆            :              O₂

            1                     :               6

          0.06                :            6×0.06 = 0.36 mol

Mass of oxygen required:

Mass = number of moles × molar mass

Number of moles  = 0.36 mol × 32 g/mol

Number of moles = 11.52 g

For the complete combustion of 10 g of glucose 11.52 g of oxygen is required.

Answer:

The volume of stone is 5cm³.

Explanation:

Given data:

Volume of water = 30 cm³

Volume of water and stone = 35 cm³

Volume of stone was 5 cm³ = true or false

Solution:

To check weather the given volume of stone is true or not we have to calculate the volume of stone from given data.

Volume of stone = (volume of water + stone ) - volume of water

Now we will put the values.

Volume of stone =  35 cm³ - 30 cm³

Volume of stone = 5 cm³

Thus the given value is true. The volume of stone is 5cm³.

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:

cilicon 14

Explanation:

Answer:

1.33

Explanation:

sorry if im wrong :(

Answer:

Over the past few decades, humans have released so many different chemicals into the air that they have changed the mix of gases in the atmosphere. ... In addition, the exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air.

Answer:

Cell

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

Answer:

A

Explanation:

Curly Hair