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Red

Litmus paper turn red when it comes in contact with acid. It turn blue if it come in contact with a base. Neutral litmus paper is purple

Answer:

See explanation

Explanation:

Initially, when the paper is hung over the light bulb, we observe that nothing happens at all.

As time goes on, air surrounding the lamp begins to heat up. Remember that hot air is lighter and less dense than cold air.  Air surrounding the lamp which has now become hotter and less dense rises and pushes on the spiral. This causes the spiral to begin to spin.

Answer:

mutualism,commensalism and parasitism

Answer:

mutualism, commensalism, and parasitism

Answer:

A)  0.0499

Explanation:

According to the mole concept, 2.80 g of calcium oxide sample  has 0.0499 moles.

According to the mole concept,mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

As per the formula for number of moles, which is mass/molar mass

number of moles of calcium oxide is:2.80/56.08=0.0499 moles.

Hence, 2.80 g sample of calcium oxide has 0.0499 moles.

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Answer:

Tonsillitis is inflammation of tonsils. It is caused by viral infection and very rarely by bacterial infection.

It is a very serious problem in case of children, adults and teenagers. The continuous coughing can lead to swelling in the throat which in case affects the  passage of airways.

This hindered air passage can cause breathing problems. The inflammation can also affect the passage of air and affects breathing.

Explanation:

Answer:

Physical change: A,C ,D, F, H, I

Chemical Change: B, E, G, J, K

Answer:

yes they carry charges

Answer:

cementation

Explanation:

part of the rock cycle

The sedimentary rocks that are formed from physical/chemical process within the earth are given the general name of chemical precipitation.

Chemical precipitation is the process of turning a liquid into a solid by either making the liquid insoluble or making it very saturated.

Chemical precipitation, which starts when water moving through rock dissolves part of the minerals, creates chemical sedimentary rocks. When the water evaporates, the minerals are finally redeposited or precipitated after being moved away from their source.

A chemical compound that develops when the solution it was dissolved in, often water, evaporates and leaves the compound behind is known as a chemical precipitate.

Thus,Chemical precipitation is the process that gives rise to chemical sedimentary rocks including limestone, halite, and flint.

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Answer:

1235

Explanation:

if thers a  a guess in that number

The compound V₂O₅ has a Seebeck coefficient at a temperature of 50 °C of -990 μV/K.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds .Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Answer:

Aluminum iodide (AlI₃)

Explanation:

The synthesis reaction of aluminum (Al) and iodine (I) can be illustrated as shown below:

Aluminium exhibit trivalent positive ion (Al³⁺)

Iodine exhibit univalent negative ion (I¯)

During reaction, there will be an exchange of ion as shown below:

Al³⁺ + I¯ —> AlI₃

Thus, we can write the balanced equation for the reaction as follow:

Al + I₂ —› AlI₃

There are 2 atoms of I on the left side and 3 atoms on the right side. It can be balance by putting 2 in front of AlI₃ and 3 in front of I₂ as shown below:

Al + 3I₂ —› 2AlI₃

There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Al as shown below:

2Al + 3I₂ —› 2AlI₃

Thus the equation is balanced.

The product on the reaction is aluminum iodide (AlI₃)

Answer:

it's SrSO4

Explanation:

Answer:

1. anion

2. compund

3. ionic bond

4. polar molecule

5. molecule

6. covalent bond

7. cation

8. metallic bond

Explanation:

Answer:

C. the carbons in ethene are linked by double bonds

Explanation:

The reason for the lack of free rotation about the carbons of ethene is that they are linked with with double bonds.

In single bonds afforded with the ethane compound, there is free rotation.

The double bonds confer a special restriction on the rotational potential of the bonded atoms round the carbon.

Answer:

Electromagnetic waves

Explanation:

The description given is that of an electromagnetic wave.

Electromagnetic waves are propagated by the vibration of electrical and magnetic fields in a perpendicular direction to one another.

Answer:

both sugar and phosphate molecules

Answer:

Both sugar and phosphate molecules

Explanation:

Answer:

It is an ionic bond.

Explanation:

Ionic bonds occur when a metal and a nonmetal combine, while covalent bonds occur between two nonmetals. Lithium is a metal and sulfur is a nonmetal.

Answer:

2,1

Explanation:

the electron configuration is 2s1

Answer:

Explanation:

Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms.

Answer:

type D

balance form .b

Explanation:

Answer:

The order and arrangement of the planets and other bodies in our solar system is due to the way the solar system formed. Nearest the Sun, only rocky material could withstand the heat when the solar system was young. For this reason, the first four planets—Mercury, Venus, Earth and Mars—are terrestrial planets.

Explanation:

Answer:

The enthalpy change of solution refers to the amount of heat that is released or absorbed during the dissolving process (at constant pressure).

Explanation:

answer is atom.Hope it is helpful.

Answer:

Atoms are the smallest particles that made up matter.

Answer:

wood

Explanation:

hope this helps! good luck on ur test :)

Answer:

Wood

Explanation:

Answer:

The final velocity of the motorcycle is 64.7 m/s

Note: Since the value for the acceleration of the motorcycle is not clear, it is assumed to be 4.55 m/s² in the calculation

Explanation:

Using the equation of motion that contains all the given values in the question: v² = u² + 2as

where v is final velocity; u is initial velocity; a is acceleration; s is horizontal distance

v = ?, u = 0 (since the motorcycle starts from rest), a = 4.55 m/s², s = 460 m

v² = 0² + 2 * 4.55 * 460

v² = 4186

take square root of both sides

v = 64.7 m/s

Therefore, the final velocity of the motorcycle is 64.7 m/s

Answer:

2 elements

Explanation:

There are the two elements that make water