The second period at the bottom of the table is called

Answers

Answer 1

Answer:

Actinides

Explanation:

The actinides are valuable primarily because they are radioactive.


Related Questions

What does the area between points D and E represent for the substance on the heating curve below?
A freezing point
B melting point
C boiling point
D sublimation point

Answers

Answer:

C. Boiling Point

Explanation:

A to B represents heat being added to the substance in a solid state, making B to C the melting point. C to D represents heat being added to the substance in a liquid state, making D to E the boiling point as the liquid is converted to a gas.

Hope this helps!

C. boiling point hahashhshddhdbvfbb for more words have a nice day

2. Which number in a chemical formula tells you how many molecules of
an element or compound you have? *

A. Coefficient

B. Chemical symbols

C. Subscript

D. Capitals

Answers

I think the answer is C2H6O

44 mL of H2CrO4 is needed to neutralize 176mL of a 10M solution of Pd(OH)4. What is the molarity of this solution?

Answers

Answer: The molarity of this solution is 2.5 M.

Explanation:

Given : [tex]V_1 = 44 mL[/tex],           [tex]V_2 = 176 mL[/tex]

[tex]M_1 = 10 M[/tex]

Therefore, the value of molarity of the solution is calculated using following formula.

[tex]M_1 \times V_1 = M_2 \times V_2[/tex]

Substitute the values into above formula as follows.

[tex]M_1 \times V_1 = M_2 \times V_2\\10 M \times 44 mL = M_2 \times 176 mL\\M_2 = \frac{10 M \times 44 mL}{176 mL}\\= 2.5 M[/tex]

Hence, molarity of the solution is 2.5 M.

HELP!
NaCl is made from 1 Na and 1 Cl. If I have 45.978 grams of Na, how many grams of NaCl can I make? (You will have to convert to moles of Na first!)
explain answer​

Answers

Answer:

116.88 g

Explanation:

Step 1: Write the balanced equation for the synthesis of NaCl

Na + 1/2 Cl₂ ⇒ NaCl

Step 2: Calculate the moles corresponding to 45.978 g of Na

The molar mass of Na is 22.990 g/mol.

45.978 g × 1 mol/22.990 g = 1.9999 mol

Step 3: Calculate the number of moles of NaCl formed from 1.9999 moles of Na

The molar ratio of Na to NaCl is 1:1. The moles of NaCl formed are 1/1 × 1.9999 mol  = 1.9999 mol.

Step 4: Calculate the mass corresponding to 1.9999 moles of NaCl

The molar mass of NaCl is 58.443 g/mol.

1.9999 mol × 58.443 g/mol = 116.88 g

Calculate the number of water (H2O) molecules produced from the decomposition of 75.50 grams of Iron (III) hydroxide (Fe(OH)3).

Answers

Answer: [tex]6.38\times 10^{23}[/tex] molecules of water are produced.

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} Fe(OH)_3=\frac{75.50g}{106.8g/mol}=0.707moles[/tex]

The balanced chemical reaction is:

[tex]2Fe(OH)_3\rightarrow Fe_2O_3+3H_2O[/tex]  

According to stoichiometry :

2 moles of [tex]Fe_2O_3[/tex] produce = 3 moles of [tex]H_2O[/tex]

Thus 0.707 moles of [tex]Fe_2O_3[/tex] will produce=[tex]\frac{3}{2}\times 0.707=1.06moles[/tex]  of [tex]H_2O[/tex]  

According to avogadro's law, 1 mole of every substance contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

Thus 1.06 moles of [tex]H_2O[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 1.06=6.38\times 10^{23}[/tex] molecules

Answer:

6.381 x 10^23

Explanation:

A woman needs a kidney transplant. The best candidate to donate a kidney to her is her
es -0)
A)
Co-Worker.
B)
daughter.
09
friend.
D
husband.

Answers

Answer: B

Explanation:

How is pascals law used in the brakes of a car?

I’m giving 67 points!

Answers

Answer:

A change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid. With that said; in a hydraulic brake system, if the piston in the master cylinder(the part your foot pushes on) is one inch square area and you push with 100 pounds, then 100 pounds per square inch is transmitted to all parts of the hydraulic system. Now if the brake caliper piston(the part that pushes against the brake pad) is 2 square inches then there will be a total of 200 lbs of force being applied by the wheel cylinder, because each square inch has 100 pounds pushing on it. This is basically how cars brake systems are designed in order to reduce the amount of force required by the driver.

Btw if u want to give 67 points u must multiply that by 2 since two people answer and they get half of 67.    Im still happy with my 34 though!

Which sentence best describes the relationship between genes and chromosomes?
A.
Genes are found within chromosomes.
B.
Several chromosomes make up one gene.
C.
Genes and chromosomes are the only things that form the nucleus.
D. Several genes are attached to different parts of the Golgi apparatus.

Answers

Answer:

A

Explanation:

What does Aluminum and Magnesium oxide create

Answers

Answer: MgAl2O4 or Spinel (gemstone)

Explanation:

It should create Spinel!

An elastic band with a spring constant of 62 N/m is extended by 0.15 m. What is the force applied to the rubber band?

Answers

Answer:

the force applied to the rubber band is -9.3N

Explanation:

The computation of the force applied to the rubber band is shown below;

We know that

Force in newtons = Spring constant × amount of extension

F = -k × x

where

-k = 62 N/m

And, x = 0.15m

So, the force applied is

= -62N/m × 0.15m

= -9.3N

hence, the force applied to the rubber band is -9.3N

the force applied to the rubber band is -9.3N

Explanation:

Explain what is happening during a redox reaction.

Answers

Answer:

Redox is a sort of compound response where the oxidation conditions of particles are changed. Redox responses are described by the real or formal exchange of electrons between substance species, frequently with one animal groups going through oxidation while another species goes through decrease

Explanation:

Brainliest?

Which term describes this diagram?

A) Element
B) Compound
C) Mixture

Answers

Answer:

b

Explanation:

the answer is B- compound

w
In your own words, what does the law of
conservation of energy tell us? Hint: It is
VERY similar to the law of conservation
of matter (we studied that in the first
semester).

Answers

Answer:

The law of conservation of mass States that matter can never be created or destroyed during c

Tetrachloroethene, C2C14 is a solvent used in many dry cleaning processes.
Write the empirical formula for tetrachloroethene.

Answers

An empirical formula presents the atoms of all the elements with the most simplified whole number ratios. In other words, divide each subscript by their greatest common factor.

The greatest common factor of 2 and 4 is 2.

2/2 = 1

4/2 = 2

So, the empirical formula for tetrachloroethene is CCl₂.

1. Identify the reactants in this chemical equation:
2H2 + O2 + 2H2O

Answers

Oxygen and hydrogen

What is the volume, in liters, of 0.250 moles of carbon monoxide at STP?

Answers

Answer:

5and I carbon dioxide and water

Answer:

5.6 L

Explanation:

Calculated it leads to the answer 5.6L

A 50.00 L sample of gas collected in the upper atmosphere at a pressure of 18.30 torr is compressed into a volume of 0.1500 L. What is the final pressure?

Answers

Answer:

the ans is in the picture with the steps  

(hope it helps can i plz have brainlist :D hehe)

Explanation:

The concept Boyles law is used here to determine the final pressure of the gas. Boyle's law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. The final pressure of the gas is  7.66 atm.

What is Boyles law?

At constant temperature, the volume of a given mass of gas is inversely proportional to its pressure. It can also be explained as at constant temperature, the product of pressure and volume of a given mass of gas is constant.

A straight line graph is obtained when pressure is plotted against the inverse of the volume.

Mathematically the law can be expressed as:

V∝ 1/P

PV = k (Constant)

Here 'V' is the volume and 'P' is the pressure of the gas.

For two different gases, the equation is given as:

P₁V₁ = P₂V₂

P₂ = P₁V₁ / V₂

1 torr = 0.00131 atm

P₁ = 0.023 atm

0.023 × 50.00  / 0.1500 = 7.66 atm

Thus the final pressure is 7.66 atm.

To know more about Boyles law, visit;

https://brainly.com/question/30367133

#SPJ2

What is the total number of grams of potassium fluoride
(molar mass = 58 g/mol) needed to make 9.4 liter of a 6.17 M solution?

Answers

Explanation:

molarity=no. of moles of solute/solution in litres

6.17M=no. of moles of solute/9.4 L

6.17×9.4=no. of moles of solute

57.9 =no. of moles of potassium fluoride KF

no. of moles=given mass /molar mass

57.9=given mass/58

3358.2 g

how to calculate density (what’s the formula)
density=_ divided by _

Answers

Answer:

density equals weigt divided by volume

Explanation:

[tex]density = \frac{m}{v} [/tex]

Calculate the volume in mL of 53.2 g of .251M solution of HCl.
Show work please

Answers

Answer:

5.813 mL

Explanation:

You need to use the formula : vol = mass / molar mass x molarity

the molar mass of HCl is 36.46 and the problem gives you the rest of the equation

0.251M x 36.46 = 9.151

53.2g / 9.151 = 5.813 mL

*I don't know some of the units so that's why some of them are blank sorry

*I'm also sorry if this is wrong but it's what I did so..

Which of the following represents an increase in kinetic energy?
A. Cooling steam from 165°C to 100°C
B. Melting 45g of ice
C. Condensing 60g of steam
D. Heating ice from -50°C to 0°C

Answers

Answer:

C

Explanation:

why does hexane have the weakest intermolecular force?

Answers

Answer:

The only intermolecular forces present in the compound Hexane are London dispersion forces which are generally the weakest. Hexane's molecular structure proves that Dipole-Dipole forces wont exist as there aren't very polar bonds in the structure.

An unknown mass of Al absorbs 187.9 J of heat and increases its temperature from 23.5 °C to 35.6 °C. What is the mass of the
aluminum?
Where:
Specific Heat of Aluminum is = 0.900 J/gºC

Answers

Answer:

mass = 17.2 grams

Explanation:

q = mcΔT => m = q/cΔT = 187j / (0.90j/g°C)(35.6°C - 23.5°C) = 17.2g

Which of these can be recycled in an attempt to conserve resources?

aluminum

natural gas

sunlight

gasoline

Answers

Answer:

aluminum

Explanation:

Hope this helped!!!

Answer:aluminum

Step-by step:

Please help i need help with this (if you can’t see the last one it says thermal)

Answers

Answer:

it would have sound a

thermal .why a train needs coal and coal get burned by heat that is thermal energy and sound beacuse a train makes sound by moving

Explanation:

have a good day /night

may i please have a branlliest

the charge of the atom is​

Answers

Answer:

the charge of an atom is zero.

Explanation:

i hope this is what you were asking for.

Use the following equation to answer the questions that follow.

Fe + 2 HCl --> FeCl2 + H2

a. If you have 3.000 moles of HCl, how many moles of gas could you make?

b. If you have 6.132 moles of each reactant, which one will run out first?

c. Based on your answer from (b), how many grams of FeCl2 would you expect to make?

d. How many moles of Excess Reactant reacted based on (b)?

e. How much Excess Reactant is left over, in moles, from (b)?

f. When actually carrying out the experiment with 6.132 moles of each reactant, you make 310.2grams of iron(II) chloride. What is your percent yield?

Answers

Sksklerodlekmdndleoeojfnfroror

1.
What is the molarity of a 3.6 L solution with 104 g of sucrose?

Answers

Answer:

.084 M

Explanation:

Molar mass of sucrose = 342.3

The formula to find molarity is moles of solute / liters of solution

Since we need to turn grams to moles for this equation we do 104 / 342.3 = 0.304

Now we can use the equation listed above. .304 / 3.6 = 0.084 M

PLEASE HELP
Find the kinetic energy of the horse using KE=1/2mv^2.

Answers

Answer:

78878

Explanation:

Is a shrimp an arachnid?
is a pill bug a insects, arachnid, or crustaceans?
is a scorpions a insects, arachnid, or crustaceans?

Answers

Answer:

Insects belong to the class Insecta, and arachnids to the class Arachnida; both classes fall under the Arthropoda phylum, along with crustaceans (crabs, lobster and shrimp). All arthropods have an exoskeleton and jointed legs. They have segmented bodies and appendages, which are divided into different segments. Arachnids belong to an even larger group of animals called “arthropods” which also include insects and crustaceans (lobster, crabs, shrimp, and barnacles).

Explanation:

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