help pls this is physical science (9th grade )

Answer:

The nucleus of an atom is positively charged.

Explanation:

The nucleus of an atom is positively charged because :

The nucleus is a small dense region at the center of the atom. It consists of a positive protons and neutral neutrons. so, It has an overall positive charged.

Answer: Yes you are.

Explanation:

A deep teeth cleaning can remove a buildup of plaque and tartar on your teeth, reducing gum inflammation and improving gum health. Plaque is a sticky film that forms on teeth. It contains bacteria and develops when food particles mix with saliva. You can remove plaque, which collects on teeth daily, by brushing your teeth.

Answer:

An aqueous solution is water that contains one or more dissolved substances. The dissolved substances in an aqueous solution may be solids, gases, or other liquids.

1,516.31168 grams of Magnesium Hydroxide

Explanation:

Transmutation, conversion of one chemical element into another. A transmutation entails a change in the structure of atomic nuclei and hence may be induced by a nuclear reaction (q.v.), such as neutron capture, or occur spontaneously by radioactive decay, such as alpha decay and beta decay (qq. v.).

Answer:

no se

ablar inglés losiento princesa

por que todo me sale en inglés?

Explicación?:

Answer:

6.022  ×10(index 23) / 7.5 = 0.8293 ×10(index 23)

Explanation:

molar mass of C =  12gmol

therefore in 12g of C there is one mole or an amount of 6.022 ×10(index 23)

∴12g/6.02210(index 23) ×1.6g

Answer: 2 The Proximity toward the ocean

Explanation:

May i plz have brainiest  

answer:lettter B that is answer

Answer:

It must first melt to become a liquid and then evaporate to become a gas

Explanation:

Answer:Douse the fire with baking soda: The chemical compound sodium bicarbonate, commonly called baking soda, is effective for extinguishing this type of fire. It takes a lot of baking soda to smother a grease fire, so pour it on while the flames are still small for the greatest effect

Explanation:

The grease fire has been put down by the addition of sodium bicarbonate as the extinguisher.

Grease fire has been defined as the fire that has been started with the over heating of the cooking oil at home. The fire has been started with the burning of the flammable liquids.

The fire in the cooking oil has been controlled with the addition of the sheet over the fire and turning off the flame.

The addition of water to grease fire results in the splashing of water over the fire and the spreading, resulting in the hazardous effects.

The sodium bicarbonate or baking soda has been used to put down grease fire.

Learn more about grease fire, here:

https://brainly.com/question/1142755

Answer:

The relationship between Voltage, Current and Resistance forms the basis of Ohm's law. In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down.

Answer:

Sr-84 + He-2  -> Na-25 + Pm-61

Explanation:

Answer:

El número atómico se refiere al número de protones o electrones de un átomo.

Explicación:

El número atómico se refiere a la cantidad de protones o la cantidad de electrones que giran alrededor de las capas u órbita de un átomo, por lo que el número atómico 7 representa que el átomo tiene 7 electrones o protones mientras que, por otro lado, el número atómico 17 muestra el número de electrones o protón. Solo hay dos electrones que entran en la primera órbita y en el resto de las capas tiene espacio para 8 electrones por lo que los átomos pierden o agregan electrones en su capa más externa para obtener estabilidad.

Answer:

three-seventh

Explanation:

CH₄ + 2O₂ = CO₂ + 2H₂O

False. To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from 10.0 M stock solution, 4.0 mL of the stock solution and 16.0 mL of water would be needed.  

Recall the law of diffusion that:

C1V1 = C2V2, where C1 = initial concentration, V1 = initial volume, C2 = final concentration, and V2 = final volume.

In this case, if C1 =10.0 M, V1 = ?, C2 = 2.00 M and V2 = 20.0 mL

V1 = 2 x 20/10

         = 4.0 mL

Hence, 4.0 mL of the stock solution would be taken. Since the final volume is 20.0 mL, only 16.0 mL of water would need to be added and not 20.0 mL.

More on dilution can be found here: https://brainly.com/question/13844449

Answer:

True

Explanation:

A titration can be defined as the experiment where the volume of known con concentration is mixed into another solution whose concentration is not known.

Most of the titration are acid-base titration. When performing titration the indicator which is used is usually phenolphthalein. The end point of the titration is the point where the indicator changes its color.

In case of acid base reaction, the end point is achieved when the phenolpthalein turns faint pink in color from transparent.

Hence, the given statement is correct, the indicator changes its color close to the end point of titration.

Answer:

None of these

Explanation:

The mass percent is 35.4% (3 s.f.)

14/4+35.5 = 14/39.5 x 100 = 35.4 (3 s.f.)

Answer:An oxygen atom usually has 8 protons, 8 neutrons, and 8 electrons. Looking at the periodic table, oxygen has atomic number 8 and atomic weight 15.999.

Explanation:

The mass of the atom with 8 protons, 8 electrons, and 8 neutrons would be approximately 16 atomic mass units as the number of electrons has an almost negligible contribution to the mass of the atom.

It is the sum of the mass of all the protons as well as the neutrons that are present inside the nucleus.

Atomic mass = total number of protons present in the nucleus + total number of neutrons present in the nucleus of an atom,

As given in the problem we have to find the atomic mass of the atom with  eight protons, eight electrons, and eight neutrons,

This given specified atom clearly represents the oxygen atom as it has eight electrons protons and neutrons each.

Thus, the atomic mass of the given atom would be 16.

Learn more about atomic mass from here, refer to the link;

brainly.com/question/11681718

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Answer:

15

Explanation:

because since the outer shell has 5 electron then add 5 and 10 to get 15

Answer:

I believe it's A. to reduce air bubbles. Tbh, it's been a while

Answer:

vegetative reproduction and asexual reproduction

Explanation:

Answer:

Asexual and vegetation reproduction

Explanation:

N + H2 → NH3

balance the equation

2N + 3H2 → 2NH3

3H2 → 2NH3

3 : 2

3.91 ÷ 3 = 1.303 mol

1.3 × 2 = 2.606 mol

Answer:

4L

Explanation: