Metals, Non-Metals, Metalloids
Students were asked to analyze the descriptors of the following elements.

Answer: 2.86 inches

Explanation: To find the radius, then, we insert 18 in for the circumference. So 18=2∏r. Solving for r gives 9/∏, or approximately 2.86 inches.

Answer:

2.86 inches

Explanation:

Answer:

Have anyone found the answer to this? I’m on this grade result course right now

Explanation:

The concentration of a potassium manganate(VII) solution (KMnO4) is 10 g /L. What is the concentration of this solution in molarity is 0.06 M.

The ratio of number of moles of solute to the volume of the solution in litre is called molarity. it is denoted by symbol M.

Given concentration (C) of potassium manganate(VII) solution in g/L is 10 g /L

Molarity = C/molar mass of KMnO4 = 10g/L ÷ 158.02g/mol = 0.06 mol/L

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Answer:

1. short allele

2.tall allele

Answer:

8.29g NaCl are present

Explanation:

To solve this question we must, as first, find the moles of NaCl in 260mL of the solution. These moles can be converted to grams using its molar mass (NaCl = 58g/mol)

Moles NaCl:

260mL * (1L / 1000mL) = 0.260L * (0.55mol / L) = 0.143 moles NaCl

Mass NaCl:

0.143 moles NaCl * (58g / mol) = 8.29g NaCl are present

Answer:

Speed is a ratio of a distance an object moves to the amount of time the object moves

Explanation:

Have a good day :)

Answer:

If the data is given we can find out the density, melting point and solubility by using the formula given below.

Explanation:

Density is defined as mass of the substance per unit volume of the solution and its formula is p = mass / volume. We can calculate melting point by noting the temperature at which the particular substance starts melting. Solubility refers to the maximum amount of a substance or solute that can be dissolved in a solvent at a given temperature. Divide the mass of the compound by the mass of the solvent and then multiply by 100 g we get solubility in g or in 100g.

Answer:

V = 1.46 L.

Explanation:

Hello there!

In this case, according to the given information, it is possible for us to solve this problem based off the definition of molarity, as the moles of solute divided by the volume in liters of solution:

[tex]M=\frac{n}{V}[/tex]

In such a way, we first calculate the moles of K2(MnO4) by using its molar mass of 197.132 g/mol:

[tex]n=75g*\frac{1mol}{197.132g}=0.38mol[/tex]

Next, we solve for the volume in the equation of molarity to obtain:

[tex]V=\frac{n}{M}[/tex]

And plug in as follows:

[tex]V=\frac{0.38mol}{0.26mol/L}\\\\V=1.46L[/tex]

Regards!

Answer:

Living things can have a minimum of one cell

Explanation:

Living things can have a minimum of one cell; these are called unicellular organisms. Some examples of unicellular organisms: bacteria, algae (plants), some fungi, and protozoa

hope this helps!

In an ecosystem ,cell is the minimum amount of material that must be present in a living organism.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

Explanation:

Fridge magnets are made of weakly ferromagnetic ceramics like barium ferrite or strontium ferrite. The magnetic field created by the fridge magnet aligns the spins of unpaired electrons in metal atoms in the fridge in such a way that the magnet and the fridge door are attracted to each other; this force keeps the magnet stuck to the fridge.

Answer:

the fridge is a magnet

Explanation:

magnets connect to fridge

Answer:

9.0 moles of CaO

Explanation:

We have the reaction equation as follows;

Fe2O3 + Ca3(PO4)2 -------> 2FePO4 + 3CaO

Now we know from the equation that;

1 mole of iron III oxide yields 3 moles of CaO

Therefore;

3 moles of iron III oxide yields 3 * 3/1

= 9.0 moles of CaO

Answer:

No. If you were to set up what the friend said it would look like this:

19.7g × [tex]\frac{grams}{moles}[/tex] ==>  [tex]\frac{19.7 grams}{1}[/tex] ×

The above does not look right because the grams do not cancel out. If it's not cancelled, it would be included in your final answer, but you're looking for moles not grams.

When setting up a stoichiometry equation, you have to put the same unit of measurement (ex- grams, cm, mm, etc.) on the numerator of one side and the denominator of the other side.

This would cancel out the unit.

For example: If you wanted to find out how much of 320 cm are in a meter.

*there are 100 cm in 1 meter*

(1. always start with the given number!)

(2. set up the next fraction where you can cancel out cm)

[tex]\frac{320cm}{1}[/tex] × [tex]\frac{1 meter}{100 cm}[/tex] = 3.2 m

Going back, your friend would have to switch the units from grams/moles to moles/grams. It would cancel out grams, which would leave moles. Therefore, moles will be included in your final answer.

[tex]\frac{19.7 grams}{1}[/tex] × [tex]\frac{moles}{grams}[/tex] = _?_ moles

You will take the ratio of mass and molar mass. Hence my friend is wrong.

The formula for calculating the number of moles is expressed as:

[tex]Moles=\frac{mass}{molar mass}[/tex]

Given the following

Mass = 19.7 grams

Since the molar mass is measured in gram per mole, hence to get the number of moles, you will take the ratio of mass and molar mass. Hence my friend is wrong.

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Answer:

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Answer:

molecules in a substance move around relative to each other

Explanation:

It means that molecules of a substance are mobile or locomotive or localised.

such as gases

Answer:

Lungworms live in the lungs of bighorn sheep causing them to be sick, or even die.

Explanation:

hope this helps

pls mark me brainliest

Answer:

The correct answer is - Pine tree.

Explanation:

Coniferous trees or cone-bearing trees normally called conifers adapted their leaves and have needles like leaves that retain more water. Needles do not appear to be leaves but are modified leaves.

Conifer trees adapt this leaf modification to prevent water loss due to transpiration in the case of dry air or atmosphere. Important members of the conifer trees are pine trees, cedars, spruces, and Pines.

Answer:

380

Explanation:

Q=mco

Q is the energy

M is mass

C is specific heat

O is increased in temperature

Explanation:

The major disadvantage of coal is its negative impact on the environment. Coal-burning energy plants are a major source of air pollution and greenhouse gas emissions. In addition to carbon monoxide and heavy metals like mercury, the use of coal releases sulfur dioxide, a harmful substance linked to acid rain.

Several principal emissions result from coal combustion: sulfur dioxide, which contributes to acid rain and respiratory illness.

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Actually Welcome to the concept of Bond Formation.

Answer is :-

B.) O and Cl

These both are Non-Metals with high Electronegativity nature, hence none of them can share electrons to foram any bond to eventually form a Electro valentines Compound.

Answer:

5.3586262014272155

Explanation:

You have to go from grams --> moles --> molecules. You can find the equation online.

First you have to find the molar mass of AlF3 which is 83.98 g/mol.

To convert it to moles you simply

450.0 grams × [tex]\frac{1 mol}{83.98 grams}[/tex] = 5.358 mol

To convert mol to molecules: (multiply by Avogadros # = 6.022*10^23)

5.358 mol × [tex]\frac{6.022*10^2^3}{1mol}[/tex] = [tex]3.23 *10^{24}[/tex]

Answer:

The Chesapeake Bay watershed continues to develop as population in the region grows. Development and urbanization at the cost of natural landscapes can lead to increased pollution of nutrients and sediment to the Bay, especially from stormwater runoff.

Explanation:

Answer:

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.

Explanation:

if this helped you should mark this the brainliest answer also you should join a meeting if you like it would be fun

Answer:

physical change is reversible but chemical change is irreveesable4

Answer:

a. 0.14 M

Explanation:

Molarity is the molar concentration of a solution and can be calculated using the formula below:

Molarity (mol/L) = number of moles (lol) ÷ volume (L)

To convert the mass of CO2 to moles, we use the formula: mole = mass/molar mass.

Molar mass of CO2 = 12 + 16(2)

= 12 + 32

= 44g/mol

mole = 2.2/44

mole = 0.05mol

Volume of can = 335mL = 335/1000 = 0.335L

Molarity = n/V

Molarity = 0.05/0.335

Molarity = 0.149

Molarity = 0.14 mol/L or M

Answer:

Some human activities that contribute to climate change would be fracking, driving vehicles, deforestation, and developing cities. Fracking releases methane and other greenhouses gases into the atmosphere. Driving vehicles, like cars or trains, also releases carbon dioxide into the atmosphere. Deforestation decreases the amount of oxygen being produced. Developing cities also contributes because it consumes almost 80% of the world's energy, as well as producing 60% of the greenhouse gases.

Answer:

the addition to solute decreases the solvent's vapor pressure. a temperature must then be applied to overcome the change

Explanation:

Answer:

long story short: A

Explanation:

Answer:

Percent yield = 65.2 %

Explanation:

The reaction determines this:

2 moles of Al react to 3 moles of chlorine gas in order to produce 2 mol of aluminum chloride.

We determine the moles of chlorine:

52 g . 1mol /70.9g = 0.733 moles of Cl₂

3 moles of gas can produce 2 moles of salt

Then, our 0.733 moles may produce (0.733 . 2) / 3 = 0.489 moles of AlCl₃

We convert moles to mass to predict the 100 % yield

0.489 mol . 133.3 g /mol = 65.19 g

Percent yield = (Yield produced / 100 % yield) . 100

Percent yield = (42.5 g / 65.19g) . 100 = 65.2 %

Answer:

If an object falls from one point to another point inside a gravitational field, the force of gravity will do positive work on the object, and the gravitational potential energy will decrease by the same amount

I believe the answer is number 1 but I could be wrong ><

Water is a substance composed of hydrogen and oxygen and exists in solid, liquid and gaseous state in nature.

Hydrogen is "a colourless, odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements".

Oxygen is "a non-metallic chemical element of Group 16 (VIa) of the periodic table".

Solid is a state of matter in which atoms or molecules are tightly packed.

Liquid is a state of matter in which atoms are held loosely and are free to flow.

Gas is a state of matter which has no fixed shape and volume.

Hence, water exists in three states of matter.

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