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Derrick
Questions and answers by visitors named
Derrick
Questions (92)
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
1 answer
236 views
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
6 answers
1,196 views
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
4 answers
1,742 views
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
5 answers
1,701 views
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
10 answers
643 views
Draw a bohr diagram of the protons and electrons in each of the following:
The ionic compounds lithium fluoride, LIF, and
3 answers
1,129 views
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
5 answers
632 views
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
4 answers
1,138 views
Balance each of the following skeleton equations.
A) KCl + Pb(NO3)2 -> PbCl2 + KNO3 I balanced it out like this. KCl2 + Pb(NO3)2
3 answers
1,261 views
I was getting restless to post these questions, so I decided to go ahead and post them.
Balance each of the following skeleton
1 answer
440 views
Balance each of the following skeleton equations.
C) C3H8 + O2 -> CO2 + H2O This one was a bit harder for me to balance out, but
2 answers
797 views
Balance each of the following skeleton equations. This is the last one left to balance.
D) C4H10 + O2 -> CO2 + H2O = C4H10 + O2
2 answers
866 views
Thank you sir for helping me out with those chemistry problems.
1 answer
347 views
Complete and balance the following neutralization reactions. then, write the names of all the reactants and all the products in
6 answers
1,910 views
DrBob222 I am beginning to understand about balancing equations well, thanks to your help, but there are still some other
2 answers
618 views
Recognize each of the following reactions as synthesis, decomposition, single replacement, double replacement, neutralization,
3 answers
1,656 views
This question is very confusing, I do not understand what it wants me to do.
Each reaction below has been identified by type. Use
14 answers
1,244 views
DrBob222 I am kind of stuck with the balancing stuff, and I already had send the post, did you not read it?
4 answers
380 views
These are the other equations I've balanced. I need help with one.
AgNO3 + K2Cr2O7 --> double replacement AgNO3 + K2Cr2O7 -->
3 answers
640 views
Which of the four factors affecting reaction rate is most important in each example below? Choose from among concentration,
4 answers
2,203 views
What is used to tell different isotopes of a particular element apart?
A. the mass number B. the atomic number C. the number of
4 answers
1,068 views
What is needed for nuclear fusion to occur?
pressure, a beta particle or high temperature? I think it's only high temperature and
5 answers
545 views
who was alleys with Britain during the war of 1812?
1 answer
383 views
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
2 answers
479 views
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
2 answers
972 views
How far away from the earth does acceleration due to gravity become 1% of its value at the earth's surface. Assume that the
1 answer
457 views
Write the pseudocode for a program to calculate the wages of a sales according to the following rules. The wage is calculated at
2 answers
890 views
Write the pseudocode for a program to calculate the wages of a sales according to the following rules. The wage is calculated at
4 answers
2,199 views
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
3 answers
584 views
Which is not a subunit of the Department of Health and Human Services?
3 answers
521 views
Carlos counted all of the tickets that were taken at a school carnival. Each time he counted 10 tickets, he placed a tally on
3 answers
934 views
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
2 answers
635 views
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
2 answers
1,082 views
The Surpreme Court ruled that slaves were not citizens of the U.S. and had no rights.
Answer:Dred Scott decision The number of
2 answers
622 views
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
5 answers
353 views
Allison's 11th birthday is just around the corner. Her parents are remodeling her bedroom for her birthday. They will replace
7 answers
590 views
Norton has cycled 15 miles and has drunk 7 liters of water. Which is the most reasonable prediction of the number of liters of
3 answers
339 views
The table shows the number of lemons needed to make different numbers of pitchers of lemonade
24lemons 3pitchers 32lemons
4 answers
619 views
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
4 answers
983 views
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
2 answers
758 views
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
2 answers
570 views
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
1 answer
1,063 views
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
2 answers
704 views
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
2 answers
1,103 views
What event in the U.S. History took place at Appomattox Court House in Virginia?
3 answers
481 views
The first transcontinental road in the United States ran from New York City to where?
2 answers
883 views
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
2 answers
574 views
Which of the following are redox reactions?
(a) Ba(NO3)2 (aq) + H2SO4 (aq) -> BaSO4 (s) + 2 HNO3 (aq) (b) NH4NO2 (s) -> N2 (g) +
4 answers
4,496 views
2 questions please:
The highest positive oxidation number that chlorine can exhibit an any compound is +7, whereas its most
1 answer
517 views
5 cards are drawn at random from a standard deck of playing cards. What is the probability that all are the same suit?
3 answers
867 views
write the structural formula for the dipeptide formed when the carboxyl end of cysteine bonds to the amino end of valine
1 answer
341 views
Find a point P on curve y = x^3 such that the slope of the line passing through point P & (1,1) is 3/4.
1 answer
351 views
What is located on 80 north latitude and 140 west longitude?
2 answers
875 views
What is located on 60 north latitude and 85 west longitude?
7 answers
2,837 views
What is 22 degrees south latitude and 43 degrees west longitude?
Rio de Janeino?
6 answers
1,033 views
23 degrees north latitude 90 degrees west longitude
Gulf of mexico?
2 answers
521 views
40 North latitude and 160 west longitude
Pacific Oceann? 23 North latitude 5 East longitude Sahara Desert? 10 South latitude and
6 answers
3,463 views
Which choice gives the correct order of operations needed to find the value of the expression below?
6+7(5-2)/3 A.+,-,x,/
4 answers
458 views
What does 8+6(7-4)/9 equal? is it 6
3 answers
311 views
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
4 answers
623 views
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?
1 answer
412 views
What is the value of the expression 7(3x18-10)
A.53 B.168 C.186 D.308 D?
3 answers
463 views
What is the value of the expression below?
(3+2)x5-6(6/2) A.10 B.22 C.12 D.20 B?
3 answers
343 views
If a mineral is 10g, how much oxygen is in the mineral.
1 answer
351 views
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
3 answers
1,391 views
Suppose the modified quota is 7.47. Fill in the blanks, and round your answers to two decimal places.
(a) Find the lower quota.
1 answer
399 views
Suppose the modified quota is 7.47. Fill in the blanks, and round your answers to two decimal places.
(a) Find the lower quota.
1 answer
450 views
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
2 answers
736 views
Superman, who likes physics, dangles his watch from a thin piece of string while he is taking off from ground horizontally at a
1 answer
491 views
In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." The radius of the room is 4.0 m, The
1 answer
718 views
A 10 m platform diver during his diving can increase his rotation rate from an initial rate of 0.8 rev/s to a maximum of 3.3
1 answer
457 views
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
4 answers
855 views
Algedra
3 answers
289 views
Factorization
1 answer
325 views
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
3 answers
581 views
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
3 answers
1,436 views
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
3 answers
1,305 views
In what way would Hill’s notion of “self-acceptance” correspond to Aristotle’s conception of eudaimonia? (Points : 1)
1 answer
398 views
I need help setting these up.
1.) Use the parallelogram rule to find the magnitude of the resultant force for the two forces
4 answers
5,244 views
The length of a rectangle is four times its width. If the area of the rectangle is 392 yd, find the perimeter
1 answer
448 views
Determine the oxidation states of Se and S in the products and reactants of the following equation. Amongst the reactants, which
1 answer
471 views
if a 1 kg mass is placed on top of the input piston what is the largest mass that the output piston
1 answer
357 views
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]
4 answers
497 views
Zinc - .5 grams
HCl- .2 moles Find the Mass of ZnCl2 [How would you solve this?]
1 answer
333 views
What is the "Percent Difference Formula for Momentum"?
2 answers
551 views
How many liters of HCl acid needed to dissolve at 1 ton of carbon and how long would it take?
3 answers
530 views
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
1 answer
495 views
A car mass 800kg starts from rest and accelerates at 1.2m/s^2 .determine the final velocity attained by the car
2 answers
605 views
Explain why a mixture of zinc oxide and magnesium reacts when heated while there is no reaction when a mixture of zinc and
4 answers
1,055 views
In a simple machine the energy input is 120J. If the efficiency of the machine is 80%, calculate the energy output of the
2 answers
603 views
The coefficient of the expression 23y + 5
2 answers
517 views
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
4 answers
773 views
