Can someone help me ?

Answer:

5.29936 x 10^23 atoms

Explanation:

To do this, we need to find the number of moles in the ring so that we can then multiply that by Avogadro's number (6.022×10^23).

equation for finding moles: [tex]n = \frac{mass}{M_{r} }[/tex]

substitute in the known values: [tex]n = \frac{17.3}{197 }[/tex]

divide to find the value of n: 0.088 mol

Multiply by Avogadro's constant: 0.088 x 6.022 x 10^23

= 5.29936 x 10^23 atoms in the ring.

hope this helps!

According to Avogadro's number, there are 5.289×10²² atoms of gold in 17.3 grams of ring.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number

In the given problem, number of atoms of gold is found out as, number of atoms=17.3/196.966×6.022×10²³=5.289×10²² atoms.

Thus, there are 5.289×10²² atoms of gold in the ring.

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Answer:

C. Moving Balloon 1 can make Balloon 2 move without the balloons touching.

Explanation:

When two balloons are rubbed with a wool cloth, they get electrostatic charge and both become negatively charged.

If both balloons will be place close together, balloon 1 will push the balloon 2 far from itself without touching it as they both are negatively charged and things with same charges repel each other.

Hence, the correct answer is "C. Moving Balloon 1 can make Balloon 2 move without the balloons touching."

Answer:

A flame test could help by seeing what things it could catch on fire from or the things that could happen with acids etc. I would test the medicine by asking someone who has had it in their life, asking doctors or I would maybe use it myself maybe. (I don’t know about c, sooo sorry)

Answer:

electropositivity or metallic character.

The ability of an atom to give away electrons and form positive ions i.e cations is known as electropositivity or metallic character.

Answer:

Air pollution can also cause headaches, dizziness, and nausea. ... Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs.

Explanation:

Answer:

19348.84 L

Explanation:

At STP, we know that;

6.02 × 10^(23) molecules = 22.4 L

Therefore, 5.2 × 10^(26) molecules = 5.2 × 10^(26) × 22.4/(6.02 × 10^(23)) = 19348.84 L

Thus, volume of CH4 with 5.2 X 10^26 molecules is 19348.84 L

Answer:

Explanation:

A chemical formula is the combination of atomic symbols that designate a particular chemical compound, or a substance with two or more different elements.  The formula shows which type and how many of each element makes up that specific compound

Answer: gamma. it is extremely deadly to living tissue

Explanation:

Answer:

I would say iconic

Explanation:

please correct me if i am wrong

Sodium sulfide compound is an ionic compound. There are 2 Na atoms per 1 Sulfide atom.

Ions with opposing charges are created in ionic compounds when metal atoms transfer electrons to nonmetal atoms. Sodium gives one electron to sulphur in the case of sodium sulphide, resulting in the formation of positively charged sodium ions (Na+) and negatively charged sulphide ions (S2-). The complex is held together in a lattice structure by the electrostatic attraction between these ion pairs with opposing charges. Sodium sulfide's high melting and boiling temperatures, as well as its capacity to conduct electricity when melted or dissolved in water, are indications of its ionic nature.

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Answer:

All three states of matter (solid, liquid and gas) expand when heated. The atoms themselves do not expand, but the volume they take up does.

When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small. Metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and don’t buckle.

Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids. This is the principle behind liquid-in-glass thermometers. An increase in temperature results in the expansion of the liquid which means it rises up the glass.

Molecules within gases are further apart and weakly attracted to each other. Heat causes the molecules to move faster, (heat energy is converted to kinetic energy) which means that the volume of a gas increases more than the volume of a solid or liquid.

However, gases that are contained in a fixed volume cannot expand - and so increases in temperature result in increases in pressure.:

Answer:

Therefore, for temperate areas in the northern hemisphere, spring begins on 1 March, summer on 1 June, autumn on 1 September, and winter on 1 December. For the southern hemisphere temperate zone, spring begins on 1 September, summer on 1 December, autumn on 1 March, and winter on 1 June.

Explanation:

The correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.

A season is a subdivision of the calendar year based on variations in the local climate, ecology, and amount of daylight hours. The axial parallel of Earth's inclinator orbit of the Sun causes seasons on Earth.

Seasons are distinguished by differences in the amount of sunlight reaching Earth's surface in temperate as well as polar areas. These fluctuations may lead certain animals to migrate or go into hibernation while others may cause vegetation to fall dormant. The correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.

Therefore, the correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.

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Answer:

1

Explanation: bases do not react with metals or carbonates

Answer:

A

Explanation:

I did the test and that's the correct answer

Answer:

B - ide

Explanation:

Answer:

The periodic table is a set of elements organized by their atomic number, from lowest (hydrogen 1) to highest (oganesson 118). That number is the amount of protons in the nucleus of an atom of the element. The table is split into three groups of elements (metals, nonmetals and metalloids). As you go down the table the elements are more reactive.

Explanation:

^^

Answer:

It's the first answer choice for sulfur and the second answer choice for magnesium I believe

Answer:

The ship's wheel is an example of a wheel and axle. It creates a mechanical advantage for the sailor because she can apply a small force over a large distance by turning the big ship's wheel.

(please mark brainliest if it's correct <33)

Answer:

nuclear power plant

Explanation:

Generation of electricity often involves the use of some kind of material or energy that is consumed as electricity is generated. There are various ways of generating electricity such as;

By burning coal

Use of a radioactive element as nuclear fuel

From wind energy

From water

From the sun, etc

Each process involves the intake of material or energy. The process that goes on in a nuclear power plant requires a radioactive fuel of which uranium is an example.

A nuclear plant uses the least amount of material (such as only 1g of uranium fuel) in electricity generation compared to the tons of coal burnt in order to generate electricity.

Answer:

changing

different

Explanation:

Answer:

Gases

Explanation:

Gases have the highest kinetic energy of any state of matter and thus occur at the highest temperatures. Increasing the temperature of a gas in an open system will not further change the state of matter because the gas molecules will only become infinitely further apart.

Answer:

Gas

Explanation:

There are many forms in which temperature increases, for example sublimation, (solid to gas) which is essentially vaporization which happens during a sub-like gas phase concluding the answer to gas.

Answer:

Chemical

Explanation:

Complete question is;

What is true of synthesis and decomposition reactions?

A) Synthesis reactions require more energy than decomposition reactions.

B) Synthesis reactions produce more products than decomposition reactions.

C) Synthesis reactions are the opposite of decomposition reactions.

D) Synthesis reactions have fewer reactants than decomposition reactions.​

Answer:

C) Synthesis reactions are the opposite of decomposition reactions.

Explanation:

Correct answer is option C. This is because, Synthesis reactions are defined as those whereby substances are combined together to form larger molecules/compounds. Whereas, decomposition reactions are the opposite due to the fact that they involve the breakdown of two or more substances.

Answer:

you can ride a bus, ride a bike, or walk to prevent greenhouse gasses from entering the atmosphere causing global warming and climate change

Explanation:

Answer:

One way that can be very helpful is finding a way to capture carbon and bad fumes from the atmosphere which Elon Musk is offering 100 million dollars to whoever can find a way to do it !

Explanation:

Answer:

The answer is 54.2 seconds

Explanation:

If you divide 542 by 10 you get 54.2 which is then labeled as seconds.

Answer:

[tex]\boxed {\boxed {\sf Hepta}}[/tex]

Explanation:

We are given the formula:

[tex]PCl_5[/tex]

This is a molecular formula, because it contains nonmetals.

1. Name the first element

The first element is phosphorous (P). Since this is the first element and there is only one, we don't need a prefix.

2. Second element

The second element is chlorine (Cl). It has a subscript of 5, so we must add the prefix of hepta-.

Add the ending of -ide.

The prefix used for the second element is hepta. The compound name is phosphorous heptachloride.