help asap select three of the following compounds that are ionic

[He] 2s² 2p⁴

Explanation:

just look it up

Answer:

[He] 2s² 2p⁴.................

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:

Chemical

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: Silicon dioxide

Explanation:

di is 2 and since oxygen is 2

Answer:

1. Gases can be easily liquefied into very small volumes and stored in liquid form Eg in LPGA cylinders and used in homes.

2. Balloons can be easily filled with air.

The fact that a gas is easily compressible is applied in the colling devices such as air conditioners as well as in the pumping of tyres with air.

Gases are easily compressible because they do not have a definite volume. This is positively applied in many areas of life.

The fact that a gas is easily compressible is applied in the colling devices such as air conditioners as well as in the pumping of tyres with air.

Learn more about compressibility of gases:https://brainly.com/question/12105531?

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Answer:

a item dropping

Explanation:

KE is movement and PE is height. As it's falling it gets KE and falls downward giving it more KE and less PE

Answer:

Explanation:

Trana make us pay for da answer smh

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:

The answer is (A)

Explanation:

When the weather changes, nature also changes because most plants rely on photosynthesis and if they don't get as much light then they can't support as much as they used causing them to shut down parts of the plant.

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 would use a weak base, as you want to combat acidity but do not want to damage your stomach. an example is tums™ which use carbon carbonate, a base.

Hope this helps, and if it did mind marking me brainliest? thanks >//-//<

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:

B - ide

Explanation:

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.

Learn more about Avogadro's number,here:

https://brainly.com/question/11907018

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Answer:

B

Explanation:

Pitch is determined by frequency. So if frequency increases, pitch increases and produces a higher sound. If frequency decreases, pitch decreases and produces a lower sound. Frequency and wavelength are inversely related, meaning that if frequency increases, wavelength becomes shorter and vice versa

Answer:

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

Answer:

changing

different

Explanation:

Answer: gamma. it is extremely deadly to living tissue

Explanation:

Answer:

As time increases, C-15 (Carbon) decreases. During radioactive decay, the amount of Carbon in a substance undergoes half-lives (A sample could have  a half life of 1002 years, for example.) When that substance ages to that timeframe, it loses half of its mass. Then for the next half-life, it loses half of that new mass, and so on.

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.

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:

Explanation:

Step One

Find the molar Mass of NH3

N =   14

3H =  3

Mass = 17

Step Two

Find the number of moles of NH3

mols = given mass / Molar Mass

given mass = 824 grams

molar mass = 17

mols = 824/17

mols =  48.47

Step Three

Find the moles of NO

Here you have to look at the balanced equation

Every 2 mols of HN3 produces 2 mols of NO

So the number of mols of NH3 = 48.47

The number of mols of  NO      = 48.47

Step Four

Find the mols of H2O

2 mols of NH3 produces 3 moles of H20

48.47 mols H20 produces x moles of H20

3/x = 2/48.47     Cross Multiply

2x = 3*48.47

2x = 145.41         Divide by 2

x = 145.41/2

x = 72.71            mols of water.

Answer: According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.

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