Does the reaction between sodium
and chlorine indicate a CHEMICAL or a
PHYSICAL change in matter?

Answer:

It is a combination of two or more substances in which each pure substance retains its

individual chemical properties.

C. Mixture

Answer:

The correct option is;

A warm front is approaching the city and temperatures will increase

Explanation:

A low pressure forms by the movement of air away from a particular spot such that the pressure reduces. The movement of air away from a spot occurs when there is a boundary of warm and cold air such that the air moves to maintain a uniform temperature.

Low pressure centers are associated with warm fronts, resulting in the fall of barometric pressure or observed low pressure and are characterized by a rise in temperature.

Answer:

I think probably diet because the type of food you put in your body (if it has high calorie or sodium) can severley affect your overall health and therefore affect your bpm(beats per minute)

Explanation:

Answer:

Running is the factor that I think influences breathe/minute

Answer:C

Explanation:

Answer:

Rock is formed when the crust cracks, magma pushes up through the cracks, water cools it.

Answer:

Physical Changes:

Let's say during your camping trip you stepped on a twig. This would be a physical change.

Let's also say that while there, you accidentally stepped on a flower, causing it to fall off of it's stem. This would also be a physical change.

Chemical Changes:

Let's say you start a fire using wood that you got from this rainforest. Since the act of burning something is a chemical change, this would apply.

Let's also say you forget a banana peel there. After a while, it would start to rot. And since rotting is a chemical change, this would apply as well.

Explanation:

Hope this helps!

Answer:

EBLM J0555-57AB

Explanation:

hope this was helpful! :)

Answer:

See explanation

Explanation:

Lanark proposed a theory of evolution hinged on use and disuse of body parts. This is a theory that upholds the transfer of acquired traits to offsprings. Darwin's theory of evolution was rather based on natural selection or 'survival of the fittest'. Darwin's theory has more evidence backing it compared to Lamarck's theory. The field of genetics which appeared long after Darwin's death confirmed that inherited traits are indeed passed from parents to offsprings. These inherited traits are usually those that give organisms an edge over others in their environment.

Earthworms are brown and not green or beige because, the brown earthworms have the same colour as the soil and are better enabled to escape from predators. From Darwin's theory, the brown earthworms are the 'fittest' hence they survive in their environment. Lamarck's theory may approach the matter from the point that earthworms move with their bodies on the soil more frequently, hence they 'acquired' the brown colour and passed it on to their offspring.

From the activity, "Hiding in the Background", individual worms spent their entire life cycle in either green or beige colour. Their colour didn't change as a result of the environment where they lived, rather the green earthworms were more in number, not particularly because of any specific changes the earthworms themselves had undergone, but because most of their predators concentrated on eating the beige worms. As a result of this, there were many green worms when the next generation began compared to the number of beige worms. Hence, there were more green earthworms.

Answer:

Three half lives corresponds to (12)3 . So a 18 quantity of the original isotope is retained. And the percentage of quantity of a radioactive material that remains after 5 half-lives will be . ∴NN0×100=10032=3.125.

Answer:

Use a spoon, scoop up a small amount of the syrup. When you do, you won't be able to see any sugar crystals in the liquid which is water.

Answer:

61

Explanation:

Answer:

most probably potential energy to chemical energy

Answer:

To minimize the intake of fats and oils by suggesting them simple ways-

Explanation:  FATS -: Fats are usually derived from animals. Fats contain a larger proportion of fatty acids that are saturated. Fats at room temperature are solid.

 OILS - Oils at room temperature are liquid.  From plants, oils are extracted.   A greater proportion of unsaturated fatty acids are found in oils.

Answer:question1 forty40

the second is  fifty one 51

Explanation:

Answer:

Explanation:

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

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

From the question

mass = 12 g

volume of pencil = 6 cm³

We have

[tex]density = \frac{12}{6} \\ [/tex]

We have the final answer as

Hope this helps you

Answer: The greater the objects mass is the greater its gravitational force.

Explanation: i got it right:)

Have a blessed day!!!!!

Answer:

i should be A i hope this helps

Explanation:

Answer:

Particles in a gas move in a straight line and do not lose kinetic energy when they collide with each other and the walls of their container.

example of oxide ore are hematite ,magnetite,chromite, zincite

Explanation:

Several species of oxide minerals are also quite useful for industrial purposes, and hold significant economic value. These include chief ores such as Hematite and Magnetite (Iron), Chromite (Chromium), Manganite (Manganese), Cassiterite (Tin), Ilmenite and Rutile (Titanium), Franklinite and Zincite (Zinc).

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Answer:

The battery is a store of internal energy (shown as chemical energy). The energy is transferred through the wires to the lamp, which then transfers the energy to the surroundings as light. These are the useful energy transfers - we use electric lamps to light up our rooms.

Explanation:

Answer:

Detail is given below.

Explanation:

Atomic radii along period.

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Atomic radii trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.

Answer:

¹₀P

Explanation:

 Nuclear reaction:

                ⁹₄Be  + ⁴₂He  → ¹²₆C + ?

To balance this equation, as with other combining specie, the mass number on both sides of the expression must be the same. Also, the atomic number must be the same.

   Let us represent the unknown by X;

          ⁹₄Be  + ⁴₂He  → ¹²₆C + ᵇₐX

 Now;

  Sum of mass number;

            9 + 4 = 12 + b

               13 = 12 + b

                    b = 1

   Sum of atomic number;

             4 + 2  = 6 + a

               a = 0

So the specie is a position ¹₀P

Answer:

i think B

Explanation:

B b b b b b b b b b b b b b b b b b b b b b b b b b b  b b b b b b  bb bb b b b b b b b b b b

Answer:garden steps that get closer together the further they are from teh ground

Explanation:

Quantized energy levels are discrete and get closer together the further they are from the nucleus

Answer:

b

Explanation:

Answer:

16.8 g/L.

Explanation:

Given that,

Mass of sugar, m = 4.2 g

Volume of tea, V = 0.25 L

We need to find the concentration of sugar in Nora's tea.

Here, 4.2 g is the mass of solute and 0.25 L is volume of the solution.

We know that,

[tex]\text{Mass concentration}=\dfrac{\text{Mass of solute}}{\text{Volume of solution}}\\\\C=\dfrac{4.2\ g}{0.25\ L}\\\\C=16.8\ g/L[/tex]

So, the concentration of sugar is 16.8 g/L.