CHEMISTRY HIGH SCHOOL

Choose the correct one plz!

Answers

Answer 1

Answer:

Answer:

Explanation:

Answer 2

Answer:

Answer:

13 N to the right

Explanation:

Related Questions

If you change the number of an atom has, it becomes a different element. If you change the number of it has, it becomes a different isotope.
Although expensive, platinum is used as a catalyst to break down harmful gases in car exhaust into less harmful gases. Which statement best describes platinum in this use? a.It is a homogeneous catalyst, so only a small amount is needed even though it exits with the products. b.It is a heterogeneous catalyst, so only a small amount is needed and it is easily separated from the products. c.It is a homogeneous catalyst, so although a large amount is needed, it is easily separated from the products. d.It is a heterogeneous catalyst, so a large amount is needed and it exits with the products.
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When an individual has an energy surplus, he or she stores the extra energy as: A. nucleic acids. B. lipids. C. None of the answer options is correct. D. carbohydrates. E. proteins.
14 Which phrase describes a molecule of CH4, in terms of molecular polarity and distribution of charge?(1) polar with an asymmetrical distribution of charge(2) polar with a symmetrical distribution of charge(3) nonpolar with an asymmetrical distribl1tion of charge(4) nonpolar with a symmetrical distribution of charge

Why do scientists use stirbars in the laboratory?a. to cool a solution
b. to heat a solution
c. to decrease the surface area of a solute
d. to agitate a solution

Answers

Answer : The correct option is, (d) to agitate a solution

Explanation :

Stir bars is a type tool which is used in the chemical laboratory for mixing the solute in the solvent.

Stir bars is a magnet which is covered with such type of material that does not react with any liquid it is immersed in. Its cover is not react for any type of liquids.

The stir bar magnet is placed in a container or flask. The stir bar magnet made to spin with an external magnetic field.

The stir bar magnet is used in the laboratory to agitate a solution.

Hence, the correct option is, (d) to agitate a solution

D. to agitate a solution

Based on their locations in the periodic table, which of these elements would you expect to have the greatest atomic radius?A. cesium (Cs)
B. lithium (Li)
C. neon (Ne)
D. radon (Rn)

Answers

Answer: Option (A) is the correct answer.

Explanation:

It is known that atomic size of atoms decreases on moving from left to right in a period of the periodic table. Whereas atomic size increases on moving from top to bottom in a group.

Lithium and cesium are both alkali metals. On the other hand, both neon and radon are noble gases.

Both cesium and radon belongs to sixth period. Cesium being at the extreme left side is larger in size than radon which is at the extreme right side of periodic table. Therefore, atomic radius of cesium will be larger than atomic radius of radon.

Whereas both lithium and neon belongs to second period. Lithium being at the top left side of periodic table has larger atomic radius than neon which is at the top right side.

Thus, we can conclude that out of the given options cesium has the largest atomic radius.

A because it has the highest energy level and lowest protons

Glycerol is a syrupy liquid often used in cosmetics and soaps. A 3.25-L sample of pure glycerol has a mass of 4.10 X 10^3 g. What is the density of glycerol in g/cm^3?

Answers

Answer: The density of glycerol will be $1.26cm^3$

Explanation:

Density is defined as the mass contained per unit volume.

$Density=(mass)/(Volume)$

Given : Mass of glycerol= $4.10* 10^3$ g

Volume of bromine = 3.25 L= $3250cm^3$ $(1L=1000cm^3)$

Putting in the values we get:

$Density=(4.10* 10^3g)/(3250cm^3)=1.26g/cm^3$

Thus density of glycerol will be $1.26cm^3$

The density of glycerol used in cosmetics and soaps is 1.26 g/cm³.

FURTHER EXPLANATION

Density is the measure of the compactness of a material. It is the mass per given volume. This can be expressed mathematically as:

$Density = (mass)/(volume)$ (equation 1)

To solve the problem, we first sort the given in the problem:

mass = 4.10 × 10³ g

volume - 3.25 L

The problem is asking for the density in units of g/cm³ which means that we must first convert the volume from liters to cm³.

$volume \ (in \ cm^3) = 3.25 \ L * (1000 \ mL)/(1 \ L) * (1 \ cm^3)/(1 \ mL)\nvolume \ (in \ cm^3) = 3250 \ cm^3$

Now we can plug in the values of mass and volume into equation 1:

$Density = (4.10 * 10^3 \ g)/(3250 \ cm^3)\n\nDensity = 1.2615 (g)/(cm^3)$

Since the given in the problem both have 3 significant figures, the final answer must also have three significant digits only. Therefore,

$\boxed {Density = 1.26 (g)/(cm^3)}$

The density of glycerol is greater than 1, so when mixed with water it will sink.

LEARN MORE

Learn more about Displacement Method brainly.com/question/11474085
Learn more about Liquid Density brainly.com/question/11301218
Learn more about Dimensional Analysis brainly.com/question/1557970

Keywords: Density, Mass, Volume, Unit Conversion

How many moles of sodium hydroxide, NaOH, are in a 35.65 g sampleof NaOH? (The molar mass of NaOH is 40.01 g/mol.)

Answers

A 35.65 g sample of NaOH contains 0.8910 moles of NaOH.

What is mole?

The mole, denoted by the sign "mol," is the volume of a system that has the same number of atoms in 0.012 kilograms of carbon-12 as there are elementary particles.

The mole, often known as mol, is a SI unit used to measure how many particles are present in a given substance. A mole is made up of 6.02214179 atoms or other fundamental building blocks like molecules.

Mass off NaOH = 39.997

given = 35.65 g of NaOH

No of moles of NaOH =35.65 g of NaOH × 1 mol NaOH /40.01 g

No of moles of NaOH = 0.8910 moles.

To know more about mole visit:

brainly.com/question/26416088

#SPJ2

Answer:

0.8910 mols of NaOH in a 35.65 g sample of NaOH

Explanation:

Mass off NaOH = 39.997

given = 35.65 g of NaOH

35.65 g of NaOH * 1 mol NaOH = 0.8910, since there are 4 sig figs.

/40.01 g

Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2? A. 2Na + Br2 --> 2NaBr B. NaBr --> Na + Br2 C. 2NaBr --> 2Na + Br 2 D. 2Na + Br2 → NaBr

Answers

Answer:

A) 2Na + $Br_(2)$ = 2NaBr

Explanation:

As the problem says that you should find the balanced chemical equation for the synthesis of NaBr from Na and $Br_(2)$ , the reactants are Na and $Br_(2)$ and the product is NaBr, so it can be writen as:

Na + $Br_(2)$ = NaBr

Then you shoud balance the equation, it means that you should have the same number of each element in each part of the equation, so if you put a number 2 for the NaBr and the Na, the equation will be balanced:

2Na + $Br_(2)$ = 2NaBr

A. 2Na + Br2-->2NaBr.

When sodium metal is added to water, an orange flame is observed on the metal surface. Based on this observation, what can best be concluded

Answers

Answer:

the answer i belive is c

Explanation:

A chemical reaction occurs because heat and light are given off.

Explanation:

A property which causes change in chemical composition of a substance is known as a chemical property. For example, reactivity, toxicity, combustion etc.

Whereas a property which causes no change in chemical composition of a substance is known as a physical property. For example, mass, volume, density etc.

Sodium is a very reactive metal and it reacts readily with oxygen, water etc. So, when sodium is added to water then occurrence of an orange flame represents its reactivity.

Thus, based on given observation it can be concluded that chemical reaction takes place when sodium is added to water.

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