PLZ HELPPPP TIMED TESTT!!!!!!?????

    the water is 36 grams.

hope this helped

Answer:

The answer is Ionization energy.

Explanation:

Ionization Energy. The ionization energy tends to increase as one moves from left to right across a given period or up a group in the periodic table.

Answer:

5.9x10²² atoms of Cu are in one naira coin

Explanation:

To solve this question we need to find the mass of Copper. Then, using its molar mass (Cu = 63.546g/mol) we must find the moles of Cu and its atoms using Avogadro's number:

Mass Cu:

7.3g * 86% = 6.278g is the mass of Cu.

Moles Cu:

6.278g * (1mol / 63.546g) = 0.099moles Cu

Atoms Cu:

0.099moles Cu * (6.022x10²³atoms / 1mol) =

Answer:

hydrogen has the highest rate of effusion

Answer:

b, its a polymer that translates genetic information.

Answer:

A has the highest concentration

Explanation:

I'll simply explain it this way;

get a color pour the whole color in a solution in container A then add a little drop in the another container(B).

you'll find out that the first container has a thicker color than container B the same thing goes for this, Beaker A has a thick looking color unlike the rest.

Answer:

oh man i haven't taken chemistry but i've seen questions similar to this and i think it's B????? I'm not positive

Explanation:

Answer:

IT îs said that the cell separarea water into its constituent elemente hidrogen and oxigen . Turn the hidrogen will ne burned ți obtain energy nu restoring the water molecules.

Explanation:

i have done

see the picture

and please mark me brainiest

Answer:

Green plants and trees use photosynthesis to make food from sunlight, carbon dioxide and water in the atmosphere: It is their primary source of energy. The importance of photosynthesis in our life is the oxygen it produces. Without photosynthesis there would be little to no oxygen on the planet.

Answer:

The answer is C

Explanation:

I did look it up, the other kid just spams random bs for points, hope you didn't get it wrong because of him! :)

Answer:

1250joules

Explanation:

The kinetic energy is energy in motion and it's formula is

KE =1/2MV^2

M represent mass which is 100Kg.

V represent velocity which is 5m/s

Therefore, KE = 1/2×100×5× 5

= 50 × 25

KE= 1250joules

Answer:

Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water

(b) Zinc + Silver nitrate → Zinc nitrate + Silver

(c) Aluminium + Copper chloride → Aluminium chloride + Copper

(d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chlorid

Explanation:

Answer:

It could pollute other planets. Nuclear waste might be attracted by the gravitational pull of the sun and disintegrate there instead. The waste storage spacecraft could crash into a planet, moon, or another astronomical body. It could be dangerous for other life forms out there.

Explanation:

Answer:

In order to obtain a volume of

1 L

,

500 mL

of water must be added to the original solution of

500 L

.

Explanation:

Answer: linear

tetrahedral

bent

trigonal bipyramidal

Explanation:

When there are two atoms around the central atom and no lone pair of electrons, the number of electron pairs will be 2  that means the hybridization will be sp and the electronic geometry of the molecule will be linear.

When there are four atoms around the central atom and no lone pair of electrons, the number of electron pairs will be 4  that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be tetrahedral.

When there are two atoms around the central atom and two lone pair of electrons, the number of electron pairs will be 4  that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be bent.

When there are five atoms around the central atom and no lone pair of electrons, the number of electron pairs will be 5 that means the hybridization will be [tex]sp^3d[/tex] and the electronic geometry of the molecule will be trigonal bipyramidal.

Answer:

In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. ... A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

Answer:

Aerobic Energy System

Explanation:

Answer:

Digestive system. It contains chemical energy. The digestive system breaks down food. Food contains chemical energy. To break down the food, the digestive system contains enzymes. Enzymes have kinetic energy to move and break down the food. They are biological catalysts. They transfer to the thermal energy store since in order to break down food at the fastest rate, they need to be at an optimum temperature.

I'm not sure if it's correct, but I'll provide some energy stores to give you inspiration:

Kinetic energy

Chemical energy

Nuclear energy

Gravitational potential energy

Elastic potential energy

Thermal energy

Answer:

no volume does not

Explanation:

Answer:

temperature

Explanation:

increase in temperature increases the rate of reaction

Answer:

Molar Mass (moles  

⇌

grams)

Stoichiometric Coefficients (moles  )

Avagadro's number

Explanation:

The daughter isotope which is present in the given radioactive decay is ²¹⁸₈₆R.

A daughter isotope is the isotope that remains following the radioactive decay of an original isotope.

In the question parent nuclei is given that ²²²₈₈R, and given chemical equation is:

²²²₈₈R → ²¹⁸₈₆R + ⁴₂He

In the above equation ²¹⁸₈₆R is the daughter nuclei and ⁴₂He is the emitted particle or rays.

Hence ²¹⁸₈₆R is the daughter isotope.

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Answer:

222 88Ra

Explanation:

Atomic number of an atom is a number that represents how many protons are in an atom’s nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

1 mole of car

Explanation:

One mole of a substance is said to be equal to 6.02 × 10^23 atoms, which is Avagadro's number or constant. In other words, 1mole of every substance = 6.02 × 10^23 atoms. Hence, the number of moles in a substance can be calculated by dividing the number of atoms contained in that substance (nA) by 6.02 × 10^23.

According to this question, If I have 6.02 x 10^23 cars, this means that I have:

6.02 x 10^23 cars ÷ 6.02 x 10^23

= 6.02 ÷ 6.02 × 10^(23-23)

= 1 × 1^0

= 1mole of car

D. She is not right, because there will be more successful collisions

between reactants in the concentrated solutions.

Enid claims that two concentrated solutions will have a lower reaction rate than two dilute solutions. The statement tells that whether Enid is right given as ". She is not right, because there will be more successful collisions between reactants in the concentrated solutions.

So, option D is correct one.

A solution which has relatively large amount of dissolved solute.

Since, rate of the reaction depends upon collision between reactants molecules. Due to presence of large amount of dissolved solute in concentrated solution, more collision is takes place between solute molecules. So, rate of reaction of concentrated solution is more as compare to dilute solution.

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Answer:

This is very easy Cuz We have 2Na2O We have O2 so thats molecule of Oxygen and its same on product We need to balance Na on start We have 1 on product We have 2 so Just put 2 at start....

Explanation:

Sorry for bad english not my first language :(

2Na+O2-->2Na20