Why do more gas bubbles mean the gold is less pure

Answer:

sugar

Explanation:

because sugar dissolves

in water, while flower    because it is insoluble

SOMEONE ANSWER DA QUESTON

Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual volume = 4.13 mL

error = 4.13 - 4.09 = 0.04

We have

[tex]p(\%) = \frac{0.04}{4.13} \times 100 \\ = 0.968523002...[/tex]

We have the final answer as

Hope this helps you

Answer:

C

Explanation:

4.They are different states of the same pure substance

Answer:

The answer to this question would be electron.

Electron is located on the outer side of the atom and constantly moving in an orbit so its location cannot be accurately determined. The cloud around the center of the atom is drawn to picture the orbit.

Neutron and proton located in the middle of an atom in a part that called nucleus. Nucleus location is kept at the center and it doesn't move.

Explanation:

Answer:

it s not on periodic table this is not real element

Explanation:

Answer:

D. What is the effect of a boat’s shape on its speed?

Explanation:

Kinetic energy can be defined as the energy possessed by an object or body due to its motion. It is the amount of work required to accelerate an object or body with a specific mass from its point of initial rest to a final velocity.

Mathematically, kinetic energy (K.E) is equal to 1/2(mv²).

Hence, the question which would involve the investigation of kinetic energy is "what is the effect of a boat’s shape on its speed?" because speed is directly related to the motion of the boat. Generally, the shape of the hull of a boat has an effect on the speed of the boat.

Answer:

What is the effect of a boat’s shape on its speed?

Answer:

An electromagnet is a coil of wire wrapped around a bar of iron or other ferromagnetic material. When electric current flows through the wire, it causes the coil and iron bar to become magnetized. An electromagnet has north and south magnetic poles and a magnetic field.

Explanation:

The three main components of an electromagnet are the iron core, copper wire, and an electricity source.

An electromagnet is a magnet in which a coiled or wrapped wire is given electricity. When Current is given to this wire, it acts like a magnet. An electromagnet is used to create a magnetic field.

The three main parts of the electromagnet are the iron core, that is the magnet, which is a small round, or square brick-like. The wire, wire, is made up of copper. The electricity source, by which electricity is given to the electromagnet.

Examples of electromagnets are induction cookers, doorbell rings, etc. They are controllable and adjustable magnets and are used in most electric appliances.

Thus, the three parts are the iron core, copper wire, and an electricity source.

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Answer:

A:

Explanation:

Because im smart

Answer: There should be 3.

Explanation:

Answer:

Separating or rubbing materials.

Explanation:

Static electricity occurs when positive (+) or negative (−) electrical charges collect on an object's surface. There are several ways this condition can be caused.

Answer:

The answer is

[tex] \huge 4\%[/tex]

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual mass = 6.25 g

error = 6.25 - 6 = 0.25

So we have

[tex]p(\%) = \frac{0.25}{6.25} \times 100[/tex]

We have the final answer as

Hope this helps you

Answer:

The acceleration of a moving object can be calculated by dividing the change in velocity by the change in TIME

Explanation:

Took the practice

Answer:

Liquid

Explanation:

The substance had appears to have a fixed volume but took the shape of the bottle it was transferred to.

If the substance doesn't have the same volume, the answer would be gas.

moisture, condensation, and temperature. 2. Evaporation and condensation are part of how a cloud forms.

Answer:

The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

Explanation:

Answer:

By just counting sigma bond and lone pair in central atom , one can easily find hybridization.

CO2 sp

SO2 sp2

NH3 sp3

BCl3 sp2

Answer:

Chemical reaction involved is:

CaCO

3

→CaO+CO

2

Molar mass of CaCO

3

=40+12+16×3=100 g

According to the balanced reaction 100 g of CaCO

3

produces 1 mol of CO

2

i.e. 22.4 L at STP.

∴50 g CaCO

3

will produce

100

22.4

×50=11.2 L CO

2

at STP.

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Considering the reaction stoichiometry, from the balanced equation and reation stoichiometry, the number of moles of calcium  oxide produced is 1 mole.

Chemical reactions are characterized by the appearance of new substances from others. That is, they are processes in which the nature of the substances changes, that is, from some initial substances called reagents, totally different ones called products are obtained.

In this case, you know that the balanced reaction is:

CaCO₃ → CaO + CO₂

Stoichiometry establishes relationships between the molecules or elements that make up the reactants of a chemical equation with the products of said reaction. In other words, stoichiometry determines the ratios between reactants and products in a chemical reaction.

The stoichiometry of a chemical reaction is perfectly established by the chemical equation. In it, the formulas of reactants and products appear preceded by numbers (the stoichiometric coefficients) that indicate the proportions according to which the transformation occurs.

The stoichiometric coefficients of a chemical equation are due to the fact that the atoms present before the reaction must be the same after the reaction, even though the atoms will have been rearranged to produce new substances.

In this case, by reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

In summary, from the balanced equation and reation stoichiometry, the number of moles of calcium  oxide produced is 1 mole.

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Answer:

D. create metal works of art. The bronze age was the age of crafting out of metal. So, using swords of metal would fit directly into the bronze age as they're metal.

Answer:

mechanical

Explanation:

cause mechanical energy is the sum of potential and kinetic enery

Answer:

1. Write the symbol and charge of the cation (metal) first and the anion (nonmetal) second. 2. Transpose only the number of the positive charge to become the subscript of the anion and the number only of the negative charge to become the subscript of the cation

Answer: A double replacement because potassium ions bond with sulfate ions to form a salt

Explanation:

Answer :The reason why compression is more difficult is a direct illustration of quantum mechanics.

Answer:

Your answer is D (gain enough kinetic energy to get past each other.)

Explanation:

Melting can be best described as a process in which molecules gain enough kinetic energy to get past each other and the correct option is option D.

Melting is the process by which a substance changes from the solid phase to the liquid phase. Melting is also known as fusion, although this term has several meanings in science.

Melting occurs when the kinetic energy of a solid increases by application of heat or pressure, such that the molecules of solid start vibrating faster but stay close to their neighboring particles, rolling around each other. This particle movement allows the substance to flow and form a liquid.

Therefore, melting can be best described as a process in which molecules gain enough kinetic energy to get past each other and the correct option is option D.

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Answer:

because it is a theory

Explanation:

The best explanation for why scientific theories are modified is simply because it is a theory. Theories are created as a set of suppositions that help humanity understand something that would otherwise be unexplainable. Since they are not proven through scientific facts but instead are more of ideas that help further our understanding of a phenomenon, they tend to be modified as new ideas are introduced and others are proven to be false/wrong.

1. v= 20 miles/hr

2. d = 45 miles

Velocity is a vector that has both magnitude and direction

Velocity is the ratio of distance per time

Can be formulated :

[tex]\tt v=\dfrac{d}{t}[/tex]

v , m/s

d , m

t, s

1. d = 40 miles

t = 2 hr

[tex]\tt v=\dfrac{40~miles}{2~hr}\\\\v=20~miles/hr[/tex]

2. maybe you meant the distance traveled

v = 15 miles/hr

t = 3 hr

[tex]\tt d=v\times t\\\\d=15\times 3\\\\d=45~miles[/tex]

Answer:

Don't mark me brainliest because of this but I'm pretty sure your supposed to give us the words because teachers don't give you things like that without the words you will the answer in with.

Answer:

Same as number of NUETRONS

POSITIVE charge

number of protons is the same as the atomic NUMBER

Located in the Nucleus

Larger mass than ELECTRONS

Explanation:

GOOD LUCK

Answer:

I think acetone has more because water is just H20

Answer:

Acetone

Explanation:

Acetone has three carbon atoms, six hydrogen atoms, and one oxygen atom.

When water has an oxygen atom and two hydrogen atoms.