hello can u answer these quickly?

1- If element X has 6 protons. How many electrons does it have? ______

2- If element Y has 10 protons. What is its atomic number? ______

3- If element Z has 15 protons & 17 neutrons. What are its number of electrons, atomic number & mass number? ____________

4- If element A has 7 electrons & 9 neutrons. How many protons does it have? And what is its atomic number? ____________



1- If the atomic number of an element is 15 & its mass number is 31? How many protons & neutrons does this element have? _______



2- If element B has 9 electrons. Find the number of protons & atomic number. ______________



3- If the mass number of element A is 60 & number of neutrons is 33. Find its number of protons & its atomic number. ______________

Answer:

kf

Explanation:

The molarity of a solution that contains 20.0grams of sodium hydroxide in 200. ml of solution is 2.3 M.

Molarity is defined as the ratio of number of moles of solute to the volume of the solution.

Molarity = number of moles of solute/ Volume of solution

Given,

given mass of sodium hydroxide= 20 g

Volume of the solution = 200 mL.

Firstly, we will calculate the moles of sodium hydroxide.

Mole is defined as the ratio of given mass of substance to the molar mass of substance.

Mole = given mass/ molar mass

Molar mass of sodium hydroxide = 40 g

Mole = 20/40

= 0.5 mol

Molarity = (0.5/ 200) × 1000 = 2.5M

Thus, we calculated that the molarity of a solution that contains 20.0grams of sodium hydroxide in 200. ml of solution is 2.3 M.

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Answer:

oxygen, carbon, aluminum, potassium

Answer:

yes its the correct one like bruhh find out ur self nah jk have a good day

Explanation:

Answer:

There are three significant figures

Explanation:

When counting sig figs you don't count the zeros unless it is between a number greater than zero. The two zeros aren't between the greater numbers so there are only 3.

Answer:

Scandium(III) fluoride, ScF3, is an ionic compound. It is slightly soluble in water but dissolves in the presence of excess fluoride to form the ScF63− anion.

hope it will help you......

A high melting point is caused by a high fusion heat, a low fusion entropy, or a blend of the two. The crystal phase of highly symmetrical molecules is densely packed with many efficient intermolecular interactions, resulting in a higher enthalpy change on melting.

An intermolecular force is a force that mediates the interaction of molecules, including electromagnetic forces of attraction or repulsion that act between atoms and other types of neighboring particles, such as atoms or ions.

The intermolecular forces can be in order of strength, ion-dipole, hydrogen bonding, dipole-dipole, and Van der Waals forces.

Because it is the power of attraction or repulsion between atoms or molecules rather than the ability to share or give/take electrons.

ScF3, or Scandium(III) fluoride, is an ionic compound. It is only slightly soluble in water, but in excess fluoride it dissolves to form the ScF63 anion.

Thus, due to the strong intermolecular forces, it have high melting point.

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Answer:

B. an alkene

Explanation:

pentene has 5 carbons and 10 hydrogen atoms and one double bond

Answer:

Number of moles = 3.82 mol

Explanation:

Given data:

Number of moles of CO₂ = ?

Mass of CO₂ = 168.2 g

Solution:

Number of moles = mass/molar mass

Molar mass of CO₂ = 44 g/mol

By putting values,

Number of moles = 168.2 g/ 44 g/mol

Number of moles = 3.82 mol

I am not sure why your teacher isn't asking for the layers, but here is the list of layers;

A -(topsoil) Mostly minerals from parent material with organic matter incorporated. A good material for plants and other organisms to live.

E - (eluviated) - Leached of clay, minerals, and organic matter, leaving a concentration of sand and silt particles of quartz or other resistant materials – missing in some soils but often found in older soils and forest soils.

B - (subsoil) Rich in minerals that leached (moved down) from the A or E horizons and accumulated here.

C - (parent material) The deposit at Earth’s surface from which the soil developed.

R - (bedrock) A mass of rock such as granite, basalt, quartzite, limestone or sandstone that forms the parent material for some soils – if the bedrock is close enough to the surface to weather. This is not soil and is located under the C horizon.

Answer: Energy is transferred from reactants to products .

Explanation: Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Reactants are your starting point, and products are your result.

Answer:

At higher altitudes, air pressure is lower. When atmospheric pressure is lower, such as at a higher altitude, it takes less energy to bring water to the boiling point. Less energy means less heat, which means water will boil at a lower temperature at a higher altitude.

In an ordinary container (exposed to atmospheric pressure). The freezing point will increase with altitude (and corresponding decrease in atmospheric pressure), but the difference is very slight.

Explanation:

When at a higher altitude , the atmospheric pressure is usually low and it

requires lesser amount of energy for the water to reach its boiling point. This

means that at higher altitudes , water boils at a lower temperature.

The freezing point of water increases with a higher altitude. This means that

water freezes at a higher temperature although the difference is very small.

The low pressure present in higher altitudes increases the melting point of

water(ice)

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Answer:

C. 101.2 L

Explanation:

N2 + H2= NH3

Balancing it,

N2 + 3 H2 = 2.NH3

(1 mol) (3 mol) (2 mol)

which means

1 molecule of nitrogen reacts with 3 molecule of hydrogen to form ammonia.

Likewise,

50.6 l of nitrogen reacts with 50.6 × 3= 151.8 l of hydrogrn to form 50.6 × 2= 101.2 l of ammonia.

Answer:

Primary goals were to discover the complete set of human genes and make them accessible for further biological study, and determine the complete study of DNA cells in the human genome.

Explanation:

Scientists undertake the Human Genome Project to provide researchers with powerful tools to understand the genetic factors in human disease, paving the way for new strategies for their diagnosis, treatment and prevention.

The Human Genome Project was an international scientific research project with the goal of determining the base pairs that make up human DNA, and of identifying, mapping and sequencing all of the genes of the human genome from both a physical and a functional standpoint.

The main objective was to discover the complete set of human genes and make them accessible for further biological study, and determine the complete sequence of DNA bases in the human genome.

Hence, Scientists undertake the Human Genome Project to provide researchers with powerful tools to understand the genetic factors in human disease, paving the way for new strategies for their diagnosis, treatment and prevention.

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Answer: 0.7 moles

Explanation:

Answer:

1 mole is equal to 6.022x10²³

Answer:

2.979 mol

Explanation:

mass of NaF=14+19

                    =33g

33g of NaF is the mass of 1 mol

98.3g of NaF is the mass of (98.3/33)*1=2.979 mol

Answer: Um pretty sure it is 22.35 m/s

1). Take your current speed in either kmph or mph.

2). Divide it by 60 to get kilometers per minute or miles per minute.

3). Divide by 60 again, getting kilometers per second or miles per second.

And der you go.

Answer:

1. it has more valence shells

2. its position in the periodic table is lower than Be

3. its bigger in atomic mass

Explanation:

=)

Answer:

acids and bases cancel each other out. acids increase H+ ions while bases release H+ ions

Explanation:

Answer:

Ring is made up off copper.

Explanation:

Given data:

Mass of ring = 89.2 g

Volume of water = 10 mL

Volume of water + ring = 20 mL

Ring is made up of = ?

Solution:

Volume of ring = (Volume of water + ring) - Volume of water

Volume of ring = 20 mL - 10 mL

Volume of ring = 10 mL

Density:

Density = mass/volume     ( 1 mL = 1 cm³)

d = 89.2 g/  10cm³

d = 8.92 g/cm³

Thus, ring is made up off copper.

Answer:

To make a cloud, air needs only to be cooled to saturation and beyond. ... Usually the water vapor amounts in air are less that this amount. When this is the case, we describe the air as being unsaturated. If we add more vapor to such air, we could reach the maximum for the temperature

Explanation:

The atmospheric conditions required for the formation of clouds are , air needs only to be cooled to saturation and beyond formation of clouds and precipitation.

Precipitation is defined as any liquid or frozen water which forms in the atmosphere and then gets received on Earth.It is one of the most important steps of the water cycle.

Precipitation takes place in form of clouds when water vapor gets accumulated in clouds and they get bigger and heavy, when the clouds become heavy enough they fall to the land in the form of rain.f a cloud is present at higher altitudes , the water present in the clouds freezes and fall to the ground in form of snow,hail.

Precipitation occurs always in case of fresh water because the sea salt does not evaporate with the water.The different types of precipitation are rain, drizzle,snow,snow hail,etc.

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All the given mixtures are classified as heterogenous and homogenous mixture in the image given below:

A mixture is composed of one or more pure substances in varying composition. There are two types of mixtures: heterogeneous and homogeneous. Heterogeneous mixtures have visually distinguishable components, while homogeneous mixtures appear uniform throughout.

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Answer:

P₂ = 2.4 atm

Explanation:

An empty beaker weighs 34.49 g. when completely filled with water, the beaker and its contents have a total mass of 299.25 g. Volume does the beaker hold 264.76 mL.

mass of water = total mass - mass of beaker

mass of water = 299.25 g - 34.49 g

mass of water = 264.76 g

density of water = mass / volume

volume = mass / density

V = 264.76 g / 1.00g/mL

V = 264.76 mL

A physical body's overall composition is measured by its mass. This term also measures inertia, or the body's resistance to acceleration when a net force is applied. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit.

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Answer:

i dont have a answer im just answering so you can give the person who answered brailiest :)

Explanation:

Answer:

I hope this helped you.

Explanation:

A: 1

B: 3

C: 3

D: 3

E: 5

F: 5