05. When a gold pebble is placed in a graduated cylinder that contains 12.0 mL of water, the water level rises
to 19.4 ml. What is the mass of the gold pebble? [The density of gold is 19.3 g/cm]

Answer:

0.00026

Explanation:

it is in the picture

Answer: I agree with the student because in the question prior to this One question stated thatExtensive properties very with the amount of matter ina sample, so yes i agree.

Explanation:

Answer:

the proton

Explanation:

Inside an atom there are neutrons which  have a neutral charge (no charge) and protons which have a positive charge. Outside an atom there are electrons those have a negative charge.

Answer:

The answer is 60300000

Explanation:

The standard notation is the counterpart of the scientific notation, while the scientific notation tries to make the number smaller by using exponential numbers with base 10, the standard notation leaves them as whole numbers or decimal numbers.

Example: 5x10∧3 is written in standard notation as 5000; Where 3 tells us the amount of 0 that follows the whole number.

2.05x10∧2 is = 205 in standard notation; Where the 2 tells us the number of times the comma is moved to the right.

Answer:730

Explanation:

Answer:

(1) See below, (2) About 8.4 pH, (3) About 3.981 * 10⁻⁶ mol dm⁻³

Explanation:

1. A buffer is a solution that resist pH when adding a basic or acidic compound. It's purpose is to neutralize added acids and bases.

2. Remember that the formula for pH is -log [H+]. We have a 0.1 M solution of baking soda in water with [H+] of about 4.0 × 10⁻⁹. Therefore we can calculate the pH as follows...

pH = -log (4.0 × 10⁻⁹)

pH = -(-8.39794...) = (About) 8.4 pH of 0.1 M of baking soda

3. This question has a similar set up...

pH = -log [H+]

[H+] = inverse of log^- pH

[H+] = 10^-5.4 = (About) 3.981 [tex]*[/tex] 10⁻⁶

Answer:

Hey there!

22.0 has three significant figures.

Let me know if this helps :)

Answer: all can be affected by the natural environment ( not sure answer hope it helped)

Explanation:

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, rock, air and water all are matter.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. Rock, air and water all are matter.

Therefore, rock, air and water all are matter.

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Answer:

Explanation:

Combustion can be defined as the burning of a compound in the presence of oxygen to produce carbon dioxide and water. Because it involves the release of heat (energy), it is referred to as an exothermic reaction.

Fuel is an organic compound and it's combustion will also go through the process above and also releases heat (exothermic reaction) into the atmosphere after burning. However, same can be said about forest fire also; as the forest is made up of plants (whose major constituents are organic also). The forest fire can also be termed as combustion because it burns in the presence of oxygen, releasing heat (energy) into the atmosphere (which also makes it an exothermic reaction).

A forest fire models the energy flow of fuel combustion by:

Combustion is the chemical process whereby there is a redox reaction that causes burning and produces smoke in the form of gas.

For combustion to occur, the following processes must occur:

As a result of this, a forest fire models the energy flow of fuel combustion by making use of a reactant like wood to create combustion.

Because this process expels energy, then it is known as an exothermic reaction.

Therefore, forest fire occurs:

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Answer:

(a) from the anode to the cathode through the external circuit

Explanation:

In an electrochemical cell, there are two half cells; the oxidation half cell and reduction half cell. Oxidation typically refers to loss of electrons and reduction refers to gain of electrons.

Electrons always flow from the anode to the cathode or from the oxidation half cell to the reduction half cell.

The electrical circuit in an electrochemical cell confirms the flow of electron. Usually a light bulb is attached. The correct option is;

(a) from the anode to the cathode through the external circuit

In an electrochemical cell, the direction which electrons travel is: (a) from the anode to the cathode through the external circuit.

Electrons can be defined as the subatomic particles of a chemical element that are negatively charged and have a magnitude of -1.

An electrochemical cell refers to a device that is capable of either generating electric current from the electrical energy released by a spontaneous redox reaction or using an electrical energy to cause chemical reactions.

Generally, an electrochemical cell is also referred to as a secondary cell and a good example is a rechargeable battery.

In Science, the direction of flow of current is usually from the anode (positive side) to the cathode (negative side) in an electrical circuit.

On a related, current is made up of electrons and as such the direction which electrons travel is usually from the anode to the cathode through the external electrical circuit.

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The density of Block A is equal to the density of Block B, therefore  statement  (c) is correct .

Density is the ratio between mass and volume or mass per unit volume.

The SI unit of density is kilogram per cubic meter (kg/m3).

It is  represented in the c g s unit of grams per cubic centimeter (g/cm3).

It is formulated by -:

Density=Mass/Volume

To calculate densities in each boxes -:

For Block A -

mass=2 kg

volume=  l b h

volume=5×2×1

volume=10 cm³

Therefore,

density for block A=mass/volume

density for block A=0.2 g/cm³

For Block B-

mass=2 kg

volume= l b h

volume=10cm³

Therefore,

density for block B=mass/volume

density for block B=0.2 g/cm³

For Block C-

mass=3 kg

volume= l b h

volume=10cm³

Therefore,

density for block C=mass/volume

density for block C=0.3 g/cm³

Hence the density of Block A is equal to the density of Block B ,therefore option (c) is correct.

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Answer:

Inventing gadgets to make their work easier.

Protecting the country using bombs and guns.

Explanation:

Explanation: The Ice Would Sink Toward the Bottom

Density of Ice at 0 Celsius is 0.92 grams per milliliter. Therefore the Ice has a greater density than ethanol, and the ice cube should sink toward the bottom

Answer:

A

Explanation:

Benedict's test is the ideal standard test to distinguished between reducing(glucose) and Non reducing(diasaccharides,sucrose).

Benedict's tests gives a positive test for the presence of reducing sugar,with the initial mixture of the sugar solution changing from  the initials green and orange  color   and brick red precipate of copper (ii) ,which would not dissolve in solution.

However, with non reducing the Benedict's gives a negative test.Because no color change occurs.

In either case,the chemical reaction that occurs as the solution gained heat  is exothermic and this may lead to boiling of the solution and spilling onto the burner,which may lead to explosion.

Answer:

2.32 liters

Explanation:

you would just divide 24 by 3 which is 8 and multiply 290 by it which is 2320 and divide by 1000 which is 2.32

The quantity of milk that will the lamb give in 24 hours is 2.32 Liter.

Lamb may be defined as the youngest form of sheep. In other words, it may be characterized as the little offspring produced by a sheep.

According to the question,

The amount of milk given by lamb in three hours = 290 milliliters.

∴ The amount of milk given by lamb in one hour = 96.66 milliliters.

Now, the amount of milk given by a lamb in 24 hours = 24 × 96.66 = 2320 milliliters.

Now, as per the requirement of the question, convert milliliter into liter.

One liter = 1000 milliliters.

∴2320 milliliters = 2320/1000 = 2.32 liters.

Therefore, the quantity of milk that will the lamb give in 24 hours is 2.32 Liter.

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Answer:

The moon should be at 543 cm.

Explanation:

If according to scientists the distance from the earth to the moon is approximately 384400 km

.

The earth has a radius of 6371 km.

A basketball has a radius of 9 cm.  (Using a basketball of this radius as a reference)

With these data you can make a rule of 3:

The earth in centimeters has a radius of 6.371e+8 cm.

So: If the earth has a radius of 6.371e+8 cm and a distance to the moon of 384,400 km, what would the distance be if the earth had a radius of 9 cm?

6.371e+8 cm      :      9 cm

384400 km       :       X

X = (384400 km * 9 cm) / 6.371e+8 cm

X = 5.43e-3 km converting to centimeters would give that:

X = 543 cm

The moon should be at 543 cm from Earth.

The reason wet clothes spread out dry faster than when left in a pile is because there is more surface area therefore the rate of evaporation increases and this decreases the time it takes for the water molecules to diffuse into the air.

Answer:

Give any two application for isotopes

Isotopes of iodine are used for radiotherapy in treatment of hyperthyroidism, cancer, etc.

Uranium, Radium, Polonium isotopes are used in atomic reactors.

Cobalt isotopes are used for irradiation of food products.

✅1) Isotopes of iodine are used for radiotherapy in treatment of hyperthyroidism, cancer, etc.

✅2) Uranium, Radium, Polonium isotopes are used in atomic reactors.

IamSugarBee

Answer:

Physical properties is that is value a state of the describes that physical system.

Explanation:

Physical property is that perform physical system can be used to the momentary and to referred the physical quantity.

Answer:

The volume of water vapor produced at STP is 11.60 L.

Explanation:

The decomposition reaction of H₂O₂ is:

2H₂O₂ → O₂ + 2H₂O     (1)

We have:

m(H₂O₂): mass = 17.0 g

M(H₂O₂): molar mass = 34 g/mol    

To find the volume of water vapor produced we need to find first the number of moles of H₂O₂ and H₂O:

[tex] n_{H_{2}O_{2}} = \frac{m}{M} = \frac{17.0 g}{34 g/mol} = 0.5 moles [/tex]

From the reaction (1) we have that 2 moles of H₂O₂ produce 2 moles of H₂O, so the number of moles of H₂O is:

[tex] 2n_{H_{2}O_{2}} = 2n_{H_{2}O} \rightarrow n_{H_{2}O} = 0.5 moles [/tex]

Now, we can find the volume of water vapor produced at STP, using Ideal gas law:

[tex] V = \frac{nRT}{P} = \frac{0.5 moles*0.085 L*atm/K*mol*273 K}{1 atm} = 11.60 L [/tex]  

Therefore, the volume of water vapor produced at STP is 11.60 L.

I hope it helps you!

Answer:

Everything that has mass and takes up space is matter. Every day, you encounter phenomena that either don't have mass or don't take up space. They are non-matter. Basically, any type of energy or any abstract concept is an example of something that is not matter.

An apple.

A person.

A table.

Air.

Water.

A computer.

Paper.

Iron.

hope this helped you

Answer:

Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.

Answer:

Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.

Answer:

it is option A

Explanation: nitrification, is the process by which bacteria in the soil convert ammonia to nitrites and nitrates. Ammonia (NH3) was produced by nitrogen fixation, but plants prefer nitrites and nitrates as a source of nitrogen and oxygen.

hope it helps

Answer:

All matter consists of indivisible particles called atoms. Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements. Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms. Hope that helps : )

hello,

here is your answer:

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Postulates of Dalton's atomic theory:

⇒ All matter is made up of very tiny particles called atoms.

⇒ Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.

⇒ Atoms of a given element are identical in mass and chemical properties.

⇒ Atoms of different elements have different masses and chemical properties.

⇒ Atoms combine in the ratio of small whole numbers to form compounds.

⇒ The relative number and kinds of atoms are constant in a given compound.

⇒ Atoms of the same elements can combine in more than one ratio to form more than one compound.

**********

hope this helped,

:)

Explanation:

Alkali metals have low melting points, low electronegativity, and low ionization energies.  They are malleable and ductile.  They are also good conductors of heat and energy.

Since they have one electron in their valence, alkali metals are very reactive.  This means that they are not found alone in nature.

Answer:

Becausee deep - water waves do not interact with the ocean bottom as they travel , their speed is independent of the water depth . But as waves enter shallow water , interaction with the bottom alters the waves . Wave speed decreases , wavelength shortens and wave height increases .

Hope this helps :)