Derrick

This page lists questions and answers that were posted by visitors named Derrick.

Questions

The following questions were asked by visitors named Derrick.

Name and give the symbol for each of the following: a)the element in period 3 group 2 = Magnesium = Mg b)the halogen in period 4 = Bromine = Br c)the element in period 6 and group 11 = Gold = Au d)the akali metal in period 2 = Lithium = Li e)the noble gas...

15 years ago

Draw a Bohr diagram of the protons and electrons in each of the following. a) an atom of magnesium Do I draw this with 19 atoms surrounding the shell of Magnesium around?

15 years ago

Draw a bohr diagram of the protons and electrons in each of the following: The ionic compounds lithium fluoride, LIF, and beryllium chloride, Becl2. Do I draw these 2 compounds separately, and I'm unsure of how.

15 years ago

When it says, " Draw a Lewis diagram for each of the following. " a)One atom of each of the elements in the second period. Is it asking me to draw a Lewis diagram for Lithium and Beryllium?

15 years ago

List the total number of each type of atoms in the following reactants. A) 2HCL + Ca(OH)2 = 6 hydrogen, 2 carbon, 2 lithium, 2 calsium, 4 oxygen B) 2Na3PO3 + 3Ca(NO3)2 This one is a bit more complicated. May any chemistry teacher show me how to do this. T...

15 years ago

Balance each of the following skeleton equations. A) KCl + Pb(NO3)2 -> PbCl2 + KNO3 I balanced it out like this. KCl2 + Pb(NO3)2 -> PbCl2 + 2KNO3 After knowing if I've done this correctly, I'll post on my other questions.

15 years ago

I was getting restless to post these questions, so I decided to go ahead and post them. Balance each of the following skeleton equations. B) Na + F2 -> NaF I balanced out this equation like this. Na + F2 -> Na2F OR would I write it as -> Na + F2 -> NaF2 ,...

15 years ago

Balance each of the following skeleton equations. C) C3H8 + O2 -> CO2 + H2O This one was a bit harder for me to balance out, but this is what I managed to do. C3H8 + O2 -> 3CO2 + 8H

15 years ago

Balance each of the following skeleton equations. This is the last one left to balance. D) C4H10 + O2 -> CO2 + H2O = C4H10 + O2 -> 4CO2 + 10H

15 years ago

Complete and balance the following neutralization reactions. then, write the names of all the reactants and all the products in each chemical reaction. A) HNO3 + Al(OH)3 = 3HNO3 + Al(OH)3 -> Al(NO3)3 + 3H2O Reactants: Nitric acid, Aluminum hydroxide Produ...

15 years ago

DrBob222 I am beginning to understand about balancing equations well, thanks to your help, but there are still some other things, which I am having a hard time figuring out. Complete and balance the following chemical reactions between an acid and a metal...

15 years ago

Recognize each of the following reactions as synthesis, decomposition, single replacement, double replacement, neutralization, or combustion. A)H3PO4 + 3NaOH -> Na3PO4 + 3H20 This reaction is known as Neutralization. B)P4 + 5O2 -> P4O10 This reaction is k...

15 years ago

This question is very confusing, I do not understand what it wants me to do. Each reaction below has been identified by type. Use this information to help predict products. Copy and then complete each equation by writing the products of the reactions. Rem...

15 years ago

DrBob222 I am kind of stuck with the balancing stuff, and I already had send the post, did you not read it?

15 years ago

These are the other equations I've balanced. I need help with one. AgNO3 + K2Cr2O7 --> double replacement AgNO3 + K2Cr2O7 --> AgCr2O7 + K2NO3 Please tell me if I've balanced these right. Br2 + NiI3 --> single replacement, element is a non-metal Br2 + NiI3...

15 years ago

Which of the four factors affecting reaction rate is most important in each example below? Choose from among concentration, temperature, surface area, and catalyst. A? Extra dish soap is added to help cut the grease when washing a frying pan. = Concentrat...

15 years ago

What is used to tell different isotopes of a particular element apart? A. the mass number B. the atomic number C. the number of protons D. the number of electrons A is the answer. After how many half-lives are there equal amounts of parent and daughter is...

15 years ago

What is needed for nuclear fusion to occur? pressure, a beta particle or high temperature? I think it's only high temperature and pressure needed.

15 years ago

who was alleys with Britain during the war of 1812?

14 years ago

A 3kg block is resting on a table with a coefficient of friction of 0.4. It is now pushed with a force of 15n. What is the acceleration of the book?

14 years ago

For what values of a and b that make the function f continuous everywhere. f(x)={(x^2-4)/(x-2) if x<2 ax^2-bx-18 if 2<x<3 10x-a+b if x>3

14 years ago

How far away from the earth does acceleration due to gravity become 1% of its value at the earth's surface. Assume that the earth is a sphere of radius 638000000cm.

14 years ago

Write the pseudocode for a program to calculate the wages of a sales according to the following rules. The wage is calculated at a rate of 15% of sales. If the salesman has been with the company more than three years, he receives a loyalty bonus of 10% of...

13 years ago

The perimeter of a rectangular field is 560m.The length of the field is an eigth third of this distance.Find the length of the field.Find the width of the field

13 years ago

Which is not a subunit of the Department of Health and Human Services?

13 years ago

Carlos counted all of the tickets that were taken at a school carnival. Each time he counted 10 tickets, he placed a tally on the chart below. Adult 16 Child 18 Which number sentence could be used to find t, the total number of tickets he counted? A.(16+1...

13 years ago

Mrs. Garcia's class is making a banner to hang in the school's display case. They started by sewing 7/8 of a yard of gold fabric at the top, 5/8 of a yard of black fabric in the center, and 7/8 of a yard of red fabric on the bottom of the banner. How many...

13 years ago

The table shows the times a train left Austin and arrived in San Antonio on 5 nights last week. Mon 6:30pm left 7:22pm arrived Tues 6:18pm left 7:10pm arrived Wed 6:45pm left 7:37pm arrived Thu 7:05pm left 7:57pm arrived Fri 6:28pm left 7:20pm arrived Wha...

13 years ago

The Surpreme Court ruled that slaves were not citizens of the U.S. and had no rights. Answer:Dred Scott decision The number of slave states and free states was kept balanced when Missouri was allowed into the Untion as a slave state and Maine as a free st...

13 years ago

Max's pencil was 8/23ft and Ian's pencil was 6/12. How much loner is Max's pencil than Ian's? A.2/12 B.4/12 C.6/12 D.14/12 Is it A or C?

13 years ago

Allison's 11th birthday is just around the corner. Her parents are remodeling her bedroom for her birthday. They will replace her carpet and repaint her walls Allison's Room Height 8ft Width 11ft Length 13ft 1.Allison wants the top 1/2 of her walls painte...

13 years ago

Norton has cycled 15 miles and has drunk 7 liters of water. Which is the most reasonable prediction of the number of liters of water he will drink by the time he has cycled 50 miles? A.17 B.23 C.31 D.65 C?

13 years ago

The table shows the number of lemons needed to make different numbers of pitchers of lemonade 24lemons 3pitchers 32lemons 4pitchers 56lemons 7 pitchers 96lemons 12pitchers What is the relationship between the number of pitchers and the number of lemons? A...

13 years ago

1.What is refraction? The bending of light as it passes through matter 2.What type of lens would you use to magnify your view of a butterfly? Concave 3.What is a sound wave? Sound waves are waves of energy moving through matter.Sound waves are vibrations...

13 years ago

Robert and his dad want to build a sandbox for his sister's birthday.They wanted it to be 4 feet wide and have an area of 28 square feet. What is the length of the sandbox? 7? Robert's dad decided to make the sandbox bigger by extending the length and wid...

13 years ago

How does a periscope work when it has 2 mirrors and light? A.Lenses refract the light B.Light bends as it travels and mirrors bend the light more C.Light travels in a straight line and the mirrors reflect the light D.Lenses and mirrors reflect the light R...

13 years ago

Which is the closest to the speed of sound in air? A. 7miles per hour B. 70miles per hour C. 700miles per hour D. 7000miles per hour C?

13 years ago

What event in the U.S. History took place at Appomattox Court House in Virginia?

13 years ago

The first transcontinental road in the United States ran from New York City to where?

13 years ago

Pure water is added to 25.0 mL of a 1.00 M HCL solution. The new solution has a volume of 2.00 L. What is the pH of the new solution.

13 years ago

Which of the following are redox reactions? (a) Ba(NO3)2 (aq) + H2SO4 (aq) -> BaSO4 (s) + 2 HNO3 (aq) (b) NH4NO2 (s) -> N2 (g) + 2 H2O (g) (c) CuO (s) + H2 (g) -> Cu (s) + H2O (L)

13 years ago

5 cards are drawn at random from a standard deck of playing cards. What is the probability that all are the same suit?

13 years ago

What is located on 80 north latitude and 140 west longitude?

13 years ago

What is 22 degrees south latitude and 43 degrees west longitude? Rio de Janeino?

13 years ago

23 degrees north latitude 90 degrees west longitude Gulf of mexico?

13 years ago

40 North latitude and 160 west longitude Pacific Oceann? 23 North latitude 5 East longitude Sahara Desert? 10 South latitude and 76 west longitude Peru? 40 North latitude 135 East longitude sea of japan? 80 north latitude 140 west longitude artic ocean?

13 years ago

Which choice gives the correct order of operations needed to find the value of the expression below? 6+7(5-2)/3 A.+,-,x,/ B.-,x,+,/ C.-,x,/,+ D./,x,-,+

13 years ago

What does 8+6(7-4)/9 equal? is it 6

13 years ago

Which choice gives the correct order of operations needed to find the value of 4(6+3)-24? A.+,x,= B.x,+,- C.-,x,+ D.+,-,x A? What is the value of the expression 7(3x18-10)? A.53 B.168 C.186 D.308 D? Simplify 4(3+2)+2(16/4) A,88 B,44 C,32 D,28 A? Simplify...

13 years ago

Which choice gives the correct order of operations needed to find the value of 4(6+3)-24 A.+,x,- B.x,+,- C.-,x,+ D.+,-,x A?

13 years ago

What is the value of the expression 7(3x18-10) A.53 B.168 C.186 D.308 D?

13 years ago

What is the value of the expression below? (3+2)x5-6(6/2) A.10 B.22 C.12 D.20 B?

13 years ago

If a mineral is 10g, how much oxygen is in the mineral.

13 years ago

A rental car agency charges $50 plus .25 cents per mile to rent a car. How many miles can you drive for $400? How many miles can you drive for $300

12 years ago

A 0.4kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3 m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 65 N, what is the maximum rpm(revolution per minute) the ball can ha...

12 years ago

A pole 25m long is placed against a vertical wall such that its lower end is 7m from the foot of the wall on the same horizontal ground. If the upper end of the pole is push down by 2m, calculate correct to 2 significant figure: 1) how much further away f...

12 years ago

Two vertical poles, 3m and 7m long are on the same straight line with a point P on the ground. The shorter pole is 20m from P and the longer pole. The angle of elevation of the top T of the longer pole from the top R of the shorter one is 30degree, calcul...

A model rocket is launched at an angle of 80 degrees aboce the x axis, with a velocity of 30m/s. How high will the rocket be 5 seconds after launch? ROund your answer to the nearest tenth

12 years ago

In the Bohr model of the hydrogen atom, an electron in the 2nd excited state moves at a speed of 5.48X10^5 m/s in a circular path having a radius of 2.12X10^-10 m. What is the effective current associated with this orbiting electron?

12 years ago

How much work is done in lifting a 6kg object from the ground to a height of 4m? A 12n object is lifted 5m how much work is done How much work is done if a 5n object is lifted from the ground to a height of 8m? How much gravitational potential energy does...

11 years ago

I need help setting these up. 1.) Use the parallelogram rule to find the magnitude of the resultant force for the two forces shown in the figure. round to one decimal place. Theta= 35 degree, b=98 lbs, c=55lb 2.) Find the magnitude and direction angle for...

10 years ago

The length of a rectangle is four times its width. If the area of the rectangle is 392 yd, find the perimeter

10 years ago

Determine the oxidation states of Se and S in the products and reactants of the following equation. Amongst the reactants, which species would be called the oxidant and which would be called the reductant? 0.5 SeO4^2- (aq) + 0.125 H2S (aq) = 0.5 SeO3^2- (...

10 years ago

I have the mass of one element and the moles of a compound, How do I find the mass of it'd Product? [Zn + 2HCl = ZnCl2 + H2] (Slove for mass of ZnCl2)

9 years ago

Zinc - .5 grams HCl- .2 moles Find the Mass of ZnCl2 [How would you solve this?]

9 years ago

How many liters of HCl acid needed to dissolve at 1 ton of carbon and how long would it take?

9 years ago

A man buys a car at 25 gh cedis.he pays 20% of the cost of his own resources and takes a loan for the remainder at 2.5% simple interest per annum.calculate the total amount the man pays for the car if he pays the loan 8 years later.

8 years ago

A car mass 800kg starts from rest and accelerates at 1.2m/s^2 .determine the final velocity attained by the car

6 years ago

Explain why a mixture of zinc oxide and magnesium reacts when heated while there is no reaction when a mixture of zinc and magnesium oxide is heated

6 years ago

The distance, d, between two points, (x1,y1) and (x2,y2), can be found using the formula d=√(x2−x1)^2+(y2−y1)^2 How can you rearrange the given formula to correctly find y2?

5 years ago

In a simple machine the energy input is 120J. If the efficiency of the machine is 80%, calculate the energy output of the machine.

5 years ago

The coefficient of the expression 23y + 5

4 years ago

A girl gets n cedis pocket money each week. She saves her money for five weeks and buys a present for her mother which costs GH7900.00. 1) write an expression for the amount of money left. 2) what is the minimum amount she needs to save each week to be ab...

4 years ago

i) A breakdown truck tows a car of mass 1000kg along a level road, and accelerates at 0.5m/s2. What is the tension in the tow line

3 years ago

Answers

The following answers were posted by visitors named Derrick.

I understand

15 years ago

The noble gas in period 1 is not Hydrogen, so it would be Helium He. Sir, can you also take a look at my "Damon" post.

Thanks for the clarification

15 years ago

Thank you both very much for your assistance

15 years ago

Thank you sir

15 years ago

Thank you very much sir

15 years ago

The part I don't get is the atom part. That wording is just so complicated. "One atom of each of the elements in the second period"

15 years ago

Thank you very much sir

15 years ago

C) H3PO3 + Ca(OH)2 = H3PO3 + 3CaOH2 Reactants: Phosphic acid, Calcium hydroxide Products: Calcium phosphate, water Could you provide me an example of what you mean by that rule. I sort of understand, but an example would be better.

15 years ago

E) H2SO4 + NaOH = H2SO4+ 2NaOH --> 2H2O + Na2SO4 About the last 2 in Na2SO4, It should be a coefficient right? Not a subscript. Reactants: Sulphic acid, sodium hydroxide Products: Sodium sulphate, water

15 years ago

DrBob222 you have no clue how much you taught me in one day. Thank You so so much for this help of yours. How can I ever thank you.

15 years ago

I forgot to mention some parts. Each reaction below has been identified by type. Use this information to help predict products. Copy and then complete each equation by writing the products of the reactions. Remember to include subscripts and parentheses w...

15 years ago

They've given me the reaction type themselves, it was in the book. Also can you please stay on this site and provide me with help.

15 years ago

I'll try to write quickly and post what I've done on here, but please sir stay.

15 years ago

A) Al + F2 --> Synthesis Products: 2 molecules of aluminum fluoride 2Al + 3F2 --> 2AlF3 B) K+O2 --> Synthesis Products: 2 molecules of Potassium oxide 4K + O2 --> 2K2O C) C2H6+O2 --> Combustion Products: Carbon dioxide, water C2H6 + 4O2 --> 2CO2 + 3H2O D)...

15 years ago

C) C2H6+O2 --> Combustion Products: 2 molecules of Carbon dioxide, 3 molecules of water C2H6 + 4O2 --> 2CO2 + 3H2O D) C6H12O4 + O2--> Combustion Products: 6 molecules of Carbon dioxide, 6 molecules of water C6H12O4 + 7O2 --> 6CO2 + 6H2O sorry I forgot to...

15 years ago

The decomposition is a bit harder for me than the rest. I looked over the examples in my book tons of times, but I still don't get it. Rb2O --> Decomposition Rb + O2 I don't know what to do rest.

15 years ago

BaCl2 + Pb(NO3)2 Could you also show me how to do the double replacement thing. The obly reactions I am getting how to do are synthesis and combustion. I need to practise alot on the other ones. Could you please show me step by step how you balance this e...

15 years ago

DrBob222 I also want to ask you something which was confusing me like a nightmare all that time, and today I realized it. For ex. C6H12O4 + 7O2 --> 6CO2 + 6H2O This equation here is balanced. But on the right side the coefficients 6 and 6 equal up to 12,...

15 years ago

Also for this equation: BaCl2 + Pb(NO3)2 I know that there is an invisible 1 infront of Ba, and that Cl is 2, but say if there wasn't that 2 there, then would there be an invisible 1 coeffient infront of Cl?

15 years ago

Thank you very much DrBob222, if I ever get stuck again, I'll be sure to ask you, but before that I'll try to figure out the problems myself as a challenge. Thank you

15 years ago

Thank you very much sir for your assistance.

15 years ago

Sorry I wasn't finished posting, I accidentally pressed enter and it ended up posting. I don't get how to solve the half-life qquestion. My other questions are... The half-life of a particular radioactibe isotope is 6 hours. What percent of the daughter i...

15 years ago

Oh my, I only wanted to submit one post, so sorry about that.

15 years ago

The 2 posts above can be erased.

15 years ago

Thank you very much sir for your assistance.

15 years ago

A jumbo jet taxiing down the runway receives word that it must return to the gate to pick up an important passenger who was late to his connecting flight. The jet is traveling at 45.0 m/s when the pilot receives the message. What is the acceleration of th...

15 years ago

Ok,Thanks cause I wasn't sure with them

Can you help me with my math questions below?

13 years ago

Whats the 2 for on A = 2(11 * 8) and A = 2 (13 * 8) ?

13 years ago

* means to divide?

13 years ago

I got #1 for number 3 is the answer $202? I multiplied 14 and 3 and 80 and 2 then I added the product and got 202

13 years ago

Mrs.Nelson bought 3 boxes of cereal for her 2 children. Each box contains 24 ounces of cereal and the children eat cereal every day. What information is needed to find the approximate number of days the cereal will last? A.The amount of time 2 the 2 child...

13 years ago

Life is full of choices, so I must learn to make good ones.

13 years ago

Pure water is added to 25.0 mL of a 1.00 M HCL solution. The new solution has a volume of 2.00 L. What is the pH of the new solution.

13 years ago

I had developed a formula which works but, not always.All you need is to get four current event.search on face book.

23 degrees north latitude 90 degrees west longitude china?

The first one I think is actually B

13 years ago

Nevermind I got all the questions. A D D B

13 years ago

Answer 4(3+2)+2(16/4) A.88 B.44 C.32 D.28 D?

13 years ago

hey lily sup luv u girl

13 years ago

60/12=5cents per inch. 5*23=Xcents

12 years ago

on a.) it should be 1/2mV^2=1/2kx^2, however whenever I do this problem on my homework I get it wrong. Im not sure why.

the correct form is comen

10 years ago

the answer is 2 and 9/10

10 years ago

14. -9 16. -12 18. 16 22. -9

9 years ago

Zinc - .5 grams HCl- .2 moles Find the Mass of ZnCl2

9 years ago

Since each he can cut it into thirds, he can make 3 from each foot. Also he has nine feet, so the equation would be 9*3=27. He can make 27 bookmarks.

9 years ago

Yes, I got the same answers as well.

9 years ago

Importance of uniformity of tablets in pharmacy

9 years ago

.0134 .802 .47 .0562 .137

8 years ago

The answer actually comes out to roughly 0.034

3 years ago

(15.0 C/s) ((180 min) (60 s/min)) = 162000 C (162000 C) / (96485 C/mol e-) = 1.67 mol e- Cr2(SO4)3 ---> 2Cr^3+ + 3SO4^2- This reaction shows that for chromium we are transferring 3 moles of electrons. (1.67 mol e-) (mol Cr / 3 mol e- transferred) = 0.559...

3 years ago

3x-3y

2 years ago