Directions: Write True if the statement is correct, if it is not, make the false statement true by changing the underlined word or phrase 1. A constellation is a configuration of stars that form a pattern. 2. The Little Dipper is a part of the constellation Ursa Major 3. The North Star is found in the Little Dipper 4. The North Star is also called Merak. 5. The North Polar Constellations can be seen in the Northern Hemisphere. ales atterns in the night sky constellations

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Answer:

6-

[tex]{ \sf{XCO _{3} }}[/tex]

because X has only one positive charge.

7-

[tex]{ \sf{increases}}[/tex]

because there is increase in hydroxyl ions which decrease the acidity or hydrogen strength of hydrochloric acid.

8-

[tex]{ \sf{Ca(NO _{3} ) _{2} }}[/tex]

Calcium has a valency of 2 and nitrate ion radicle has valency of 1

Polymers can be found naturally in plants as well as in animals or can be human made or synthetic. Here nucleic acids and proteins similar, because They are both polymers. The correct option is A.

The large macromolecules which are formed by the combination of a large number of smaller subunits called the monomers are defined as the polymers. The polymers are present all around us, also in DNA which is a naturally occurring biopolymer.

Proteins, starch, cellulose, etc. are natural polymers. Nucleic acids are the polynucleotides of very high molecular mass formed from the linking of nucleotide units. They are important biopolymers for the transmission of hereditary character.

Proteins are also complex molecules from the amino acids and they are responsible for the metabolism, defense, etc. Keratin is a protein found in the outer part of skin.

Thus the correct option is A.

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Water is the solvent in the saline solution. Hence, option D is correct.

A solute is something being dissolved, a solvent is a thing dissolving the item, and the solution is the mixture of the two items.

In a hospital, bags of saline solution are used to rehydrate patients. They are made by dissolving a specific amount of salt in water. Water is the solvent in the saline solution.

Hence, option D is correct.

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Answer:

Thermal energy transfers hear from the students hand to the ice

Answer:

NaCl is an electrovalent compound because the sodium and chlorine atoms give one electron from their outermost shells to each other in order to complete their octets

Explanation:

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Answer:

2. Chemical reactions changes occur when the bonds between atoms in a molecule are created or destroyed.

3. When you reach your its boiling point, the molecules in liquid have enough energy to become a gas.

4. When you have a solid with more than one type of compound, it is called a mixture.

5. A Crystal is a form of solid where the atoms are arranged is a very specific order.

6. If you have different types of molecules dissolved in a liquid, it is called a solution

Answer:

They are branch of science.

Explanation:

hope this helps

Answer:

Branch's of science yk

Explanation:

I'm smart lol

Answer:

there are 4 possible isomers

Answer:

MgO2

H202

NH4)2SO4

Explanation:

hope this helps you

Answer:

B

Explanation:

I would say theory since a law is already set and proven by evidence. Theories arent necessarily proven.

Answer:

The SI system : The international system of units.

It is a scientific method of expressing the magnitudes or quantities of important natural phenomena.

Benefits of SI system

Answer:

don't know..............

Answer:

increase temperature, increase surface areas, add catalyst, stir

The rate of reaction can be increased with the increase in temperature, surface area, adding catalyst and allowing stirring. Thus, option C is correct.

The rate of reaction is given as the rate of formation of product or the rate of disappearance of reactant in unit time.

The rate of reaction can be affected with:

Thus, the rate of reaction can be increased with the increase in temperature, surface area, adding catalyst and allowing stirring. Thus, option C is correct.

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Answer:

The answer is below

Explanation:

1.

Tap water - Mixtures

Sodium - Compound

Nitrate - Compound

Rust - Compound

Distilled - Compound

Water - Compound

Paint - Mixture

Sugar - Compound

Carbon dioxide  - Compound

Brine - Mixture

Apple Juice - Mixture

Petrol - Mixture

Ink - Mixture

Alcohol - Compound

____________________________________________

A) - Chromatography

B) - Fractional Distillation

C) Simple Distillation

D) Filtration

Q.1 Classify the following as mixture or compound :

MIXTURE :

COMPOUND :

Q.2

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Answer:

О

because it has the fewest number of electrons

Answer:

The cathode is the electrode where reduction takes place.

so

reduction occur in Cathode in an electrochemical cell.

Answer: Cathode

Explanation:

.

Answer:

a measuring cylinder containing water only.

Explanation:

If we want to measure the volume of an irregular object. We need a properly calibrated measuring cylinder filled with water of known volume.

The irregular object is now inserted into the measuring cylinder containing water and the change in the volume of water is noted. The volume of the irregular object is now obtained as;

New volume of water - initial volume of water.

Hence, only a measuring cylinder filled with water is required to measure the volume of a small irregularly- shaped stone.

Answer: A. ( VO2)

Explanation:

Answer:

B) VO

Vanadium(II) oxide is the inorganic compound with the idealized formula VO.

Answer:

camphor sublimates salt is soluble in water while sand does not sublime and does not dissolve in water you first heat the mixture in a beaker covered with a watch glass camphor will then accumulate on the watch glass then you dissolve the remaining mixture of sand and salt salt will dissolve forming a salt solution then you filter using a filter paper and a beaker the residue on the filter paper is sand while the filtrate is salt solution you then heat the salt solution so that it can evaporate leaving salt particles thus you will have obtained salt sand and camphor

Answer:

Sodium.  

Explanation:

Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is ²³Na.

Answer:

sodium

atomic mass 22.99

atomic number 11

period 3 group 1 1a

sodium is also an Alkali metal

Explanation:

I have a periodic table on my computer I hope I helped

Answer:

H20is water andN20is nitrogen 4 oxide

Answer:

a

Explanation:

the rat felt the normal diet with vitamin are gain weight than the rat felt with diet

Answer:

C

electrons are negatively charged particles

Answer: D

Explanation:

just took the test

Answer:

See explanation

Explanation:

Intermolecular forces are forces of attraction that exist between molecules of a substance in a particular state of matter.

The dominant intermolecular force of attraction in H2O is the hydrogen bond. The hydrogen bond exists between molecules of a substance when the substance is made of hydrogen atoms bonded to atoms of a highly electronegative element. Hence, strong hydrogen bonding accounts for the high boiling point of water.

The magnitude of hydrogen bonding between molecules depends on the electro negativity of the atoms to which hydrogen is bonded.

The more the electro negativity of the atoms to which hydrogen is bonded, the greater the magnitude of intermolecular hydrogen bonding.

Since the electro negativity of elements decrease down the group, the strength of intermolecular hydrogen bonding between the molecules decreases as follows;

H2O> H2S> H2Se> H2Te

Answer:

Energy is absorbed, so the mass is increased. Energy is released, so the mass is increased

Answer:

Consciousness refers to your individual awareness of your unique thoughts, memories, feelings, sensations, and environments. Essentially, your consciousness is your awareness of yourself and the world around you. This awareness is subjective and unique to you.

Explanation:

Answer:

It's about mass of 40.1⋅g

Explanation:

I hope this helps you out. Have a nice day!