# 8th grd chemistry:D

59,372 results

**8th grd chemistry:D**

which of these statements is true about an atom of chromium? (A) has more protons then electrons. (B) has fewer parts than an atom of iron. (C) has an atomic number of 51.996. (D) has more electrons than neutrons.

**math-grd 11**

what do they mean by sine regression? i am currently working on the grd 11 isu and i am just wondering how i am supposed to incorpporate sine regreession into it? my isu is, you have a picture you have to find a curve in it and figure out the equation of it

**chemistry**

Im brenda,n i found its hard copng in chemistry.im dng grd 11,n i wish 2 hv sm1 wo wil help m cope.tnx

**chemistry**

Calculate the volume of HNO3 that must be introduced in the calorimeter,knowing that it were used 60 ml NaOH, Cc=100cal/grd and delta H=-13,5 kcal/mol.. please help me,i have no clue for this..

**grd 11**

what is sin regression?

**math grd 10**

factor the polynomials x^2 -6 x^2 +5x-6

**grd 12 U chemistry**

Hi, i have a project for chemistry, i have to choose a scientist (i chose Micheal Smith) his career is biochemistry and i have to create a career related to biochemistry.. Question: After finding the famous chemist and then using their field of chemistry, create a career that ...

**GRD 11-NEEED IT FAST, EMERGENCY**

WHAT IS SIN REGRESSION ?

**Chemistry grd 11**

Provided with enough heat, magnesium and oxygen can undergo a synthesis reaction. How much magnesium oxide is produced if 50g of Mg is reacted with 50g of oxygen?

**Chemistry grd 11**

Provided with enough heat, magnesium and oxygen can undergo a synthesis reaction. How much magnesium oxide is produced if 50g of Mg is reacted with 50g of oxygen?

**6th grd math**

How can i find the area of a 14inch circle? Thank You so much!

**functions grd 12**

what are the number of turning points for this equation? y=4x^2 and can you plz explain how u find them thanks :)

**math grd 11**

how do u draw an asymtote ? diff btwn set and interval notation? and example plz

**social studies**

i am a 7th grd and i have to do a three page eassy on been respectful it due by 3/23/11

**math**

build equation Of the 15 players on the boys' soccer team, 2/5 are 8th graders. On the girls' soccer team,1/3 of 18 are 8th graders. How many 8th graders plaayed on the two teams.

**8th Grade**

Whta is a verctorican (srry i can't spell that) award when the 8th graders get one?????

**Science grd 9**

Calculate the cost of watching TV for 5 h at night at a rate of 8.8 cents/kW•h. The TV has a power rating of 180W. Please show work

**math grd 11-midterm tomm**

please explain how do u draw an asymtote ? and whats the diff btwn set and interval notation? and example plz thanks

**6th grd. MATH QUIZ HELP!!!!**

Questions- 1) Solve the equation 3x=-3=-18 a) x=-7 b) x=-5 c) x=-3 d) x=5 THERE ARE MORE QUESTIONS!

**life orientation grd 12**

Critically discuss six ways that the human rights violations influence individuals,groups and the broader south african community

**5th grd math- metric conversion**

30m = 6000, i have converted to cm, in, and ft, no where close to getting 6000? help

**Grd 12 Math**

Can someone please help me work out how to get to the answer of: tanx + tan (pi-x) + cot (pi/2+x) = tan (2pi-x)

**8th Grade**

Me and my friend are making our own 8th grade binder, you know like writing down planns for our 8th grade year. Here are the sections: - To-Do-List - Doodles (if you are bored) - Projects that are do (school plans) - Graduation Plans (speech, to-do-list, etc.) - Dates for ...

**Math grd 12**

In how many ways can you make Rhe border if it requires 15 titles and you use only blue and white ones? Explain your reasoning. The final answer is 8008.

**physics grd 12**

two charged object are positioned 15cm apart. spere a has a charge 3.6 x 10^-7 C and b has a charge of -8.1 x 10 ^ -7 C. at what point is the field intensity 0 ?

**reading**

Could 8th grades books to read? I am more on a college/highschool reading level but i need the appropriateness for an 8th grader. thanks.

**Math grd 12**

How many different seven-digit telephone numbers are possible if no number may begin with 0?.....the answer is 9,000,000 but I'm not sure how to get that, plz explain:)

**Grd 12 life orientation**

Describe the life style behaviour and explain 5 factors that contribute to the substance abuse of both legal and illegal drugs among the youth

**Math**

Help me please to simplify 8 to 8th power x 8 negative 8th power

**chemistry**

(3.21x10 to the 8th)(6.32x10 to the -12th) is it... 20.2872x10 to the -4th?

**advanced functions grd 12**

im not sure wheer to start and how to do solve this problem solve: cosX(2sinX-3^1/2)=0 ,0<(or equal to)X<(or equal to)2(pie sign)

**chemestry grd 11**

indigo C16H10N2O2 (numbers are suppose to b as a subscript) is the common name of the dye that gives blue jeans their characteristic colour. Calculate the mass of oxygenin 25.0g og indigo. show your work.

**math grd 10**

a trapiziod has vertices A(-2,3) B(4,1) C(-1,-1) and D(2,-2). prove that the line joining the midpoints of the non-parallel sides is the average length of the two parallel sides of the trapaziod.

**8 Grd L.A.**

How does the repetition in the preceding sentence convey the author's negative attitude toward television? I think it shows how the author thinks negatively about television.

**science**

This is for a 4th grd science project. I am in doubt in what independent variables to use for the project. The topic that my daughter selected is Does heart rate INCREASE with INCREASING SOUND volume? Thank you for your help!!!

**8th grade**

im in advanced math so i do 8th grade math and i don't understand how too gragh the fractions in equations like y=2/3x+1

**Science grd 9**

Determine which appliance uses the most electrical energy: a clothes dryer that operates for 30 min/day or a freezer that operates for 24h/day. Please show work

**math-11**

okay this is the frst day of grd 11 math and i am doing review and i don't remember anything what do they mean when they say " determine the velue of the three primary trigonometric ratios for <BAC in each of the following triangle.? and they give us the length of A-C which...

**8th grade**

In chemistry what is the practical applicaiton of scientific principles to solve everyday problems?

**10th grade - chemistry**

what is 670.8/1000000000 and then what is 3.0 * 10 to the 8th power divided by the top answer ...

**8th grade chemistry**

which of the following molecules does not contain 5 atoms? A. CaCO3 B. Mg(OH)2 C. NaHCO3 D. Fe2O3

**Precalc**

Find a formula for the nth term if... a)the 8th term is 8 and the 20th term is 44 b) the 8th term is 4 and the 18th term is -96 thanks!! I am just confused how you do this if you don't know what n is.

**Maths literacy,history,life science,english,xhosa,life orantation,geography.**

I'am doing grade 11 now and when i passed grd 12 next year.i want to know what caree is good for my subjects ,because i don't know what caree should i take.

**8 Grd L.A.**

"When before in human history has so humanity collectively surrendered so much of its leisure to one toy, one mass diversion?" How would you answer the rhetorical question? ____________________________________________________________________________ I'm thinking the answer is ...

**math**

in an ap the difference is between the 8th and 4th term is 20 and the 8th term is one and the half times the fourth term what is the common difference

**algebra**

A plumber needs 4 sections of pipe 2and 7/8 feet long. Can this be cut from a 12 ft. section? If so, how much pipe will be left over? If not, why not? I came up with yes, you will use 11 1/8th amount and have a section of 1 and 1/8th left. Is this correct?

**math**

The question that have is to simplify and write the answer in exponential notation using positive exponents 2 to 4th power x 2 -2 These are my choices a 4 to the 8th power b 2 to the 8th power c 4 to the 2nd power d 2 to the 2nd power

**ahisco**

In an A.P the difference between the 8th term and 4th term is 20 and the 8th term is 1half timesthe fourth term. what is the common difference and the first term of the sequence

**math**

Ok, the problem says: a Middle school has 125 6th graders, 150 7th graders, and 100 8th graders. Which statement is NOT true? a. the ratio of 6th graders to 7th graders is 5 to 6. b. the ratio of 8th graders to 7th graders is 3:2. c. the ratio of 6th graders to students in all...

**4th grd math**

Belle gets 3 buckets of fish evreyday. there are 8 fish in each bucket.if Belle eats two and a half buckets of fish,how many fish will she have left

**Chemistry**

What is the wavelength of a photon having a frequency of 71.6 THz? So I know 1 THz = 10 to the power of 15 Hz And c= 3 x 10 to the 8th and h= 6.63 x 10 to the -34th

**Chemistry Numerical**

The half life period of a radioactive element is 27.96 days. Calculate the time taken by a given sample to reduce to 1/8th of its initial activity

**chem- science - grd 11**

okay so i have to prepare a procedure for the following experiment, except i have no clue what to do question- the science department had 5 different solutions but accidently lost thier labels. devise a procedure to help you determine which liquid is what? *hint- you may use ...

**kumasi polytechnic**

In A.P the difference between the 8th term and 4th term is 20,and the 8th term is one and half times the 4th term.Find the common difference, and the first term.

**8th grade math**

I am in 8th grade math as a sixth grader. I am stuck on one problem. It is this: You are making a necklace that is 9 inches long. You use 6 beads for each inch. what integer is the change in your supply of beads after making the necklace?

**fractions**

Mr.shafier has been teaching school for 10 years.For 6 of those years he taught 8th grade.what fraction represents the time Mr.shafier has not been teaching 8th grade?I knoe the answere is 2 5ths. but how do i show work?HELP!!!!!!!!!!!!!!!

**Science grd 9**

The estimated average energy that I used to operate a cloths dryer for a year is is kW•h. If the average rate to operate the dryer is 7.15 cents/kW•h, what is the average cost per year.

**Math**

Jim opens a savings account with $5. His account doubles every month. How much will he have after the 8th month? 1st 2x5=10 2nd 10x2=20 3rd 20x2=40 4th 40x2=80 5th 80x2=160 6th 160x2=320 7th 320x2=640 8th 640x2=1280 1280 was marked wrong. why?

**6th grd math**

Mary put new tiles on her kitchen floor. The floor measures 6 ft long by 5 ft wide. She used 10 tiles to cover the entire floor each tile was 3 ft long. Write an equation using the variable x to model this situation. What does x represent in the equation?

**8th grade Math**

I'm actually in 7th grade, but I'm doing 8th grade pre-algebra, but anyway, here: I'm supposed to simplify these four problems and I don't really understand how: 28s (15 power) ____ 42s (12 power) 4m+(n[7th power]m) 63m(5 power)n(6 power) ______________________ 27mn 3a·4a(4 ...

**Math: Mean, Median, Mode, Range & Finding the devi**

What is deviation? And what is the definition of frequency distribution & how would I solve a problem in 8th grade math with this problem...My child is asking about this problem she has in an 8th grade book. Given the following numbers 2,2,3,6,1,9,4,2,5,7,6,8,6, What is the ...

**Maths**

1) In the arithmetic progression, the 8th term is twice the 4th term and the 20th term is 40. Find the common difference and the sum of the terms from the 8th to the 20th term inclusive. 2) Find the least number of terms of the AP, 1+3+5...that are required to make a sum ...

**8th Grade Chemistry**

This is from the Glencoe book Chemistry, Book L. Unlike sodium and chlorine, some atoms becomre more stable by sharing_______, forming______________rather than charged__________. The bonds in a molecule of oxygen are _______ _______ bonds, while the bonds in molecule of water ...

**Grd.10 Science**

So i did a science lab today, and i am supposed to come up with the skeleton equation for it The chemical reaction is decomposition (starting with one compound that will break off into 1 or more compounds after reaction) This is what i have so far : Cu (CO3) ---> CO2 + ____...

**GEOGRAPHY,HISTORY,MATHS LIT AND LIFE SCIENCES**

HI I'M MLULEKI NDOVELA FRM UMLAZI SEC SCHOOL IM DOING GRD 12 STDYNG GEOGRAPHY,HISTORY,MATHS LIT,LIFE SCIENCES I WANT TO KNW WHCH CAREER PATH IS CAN I TAKE.

**Chemistry**

A sample of charcoal is found to have only 1/8th of Carbon-14. Half-life of Carbon-14 is 5730yrs, what is the age of the charcoal?

**Chemistry**

Ba-140 has a half life of 13.0 days. What fraction of a sample of Ba-140 will remain after 39 days? A. 1/8th B. 1/16th C. 1/2th D. 1/4th

**Grd 12 U English**

I am the discussion director for my group. I have to grab 4 reallyyy good discussion questions for the book The Kite Runner. I already found one good question, I need the other 3. It has to be from chapter 1-3 PLEASE help me out, i'm so stuck, honestly I really want my group ...

**chemistry**

i have a question on scientific notation. is you have: 8x10 to the 5th power over 2x10 to the -3rd power is the answer 4x10 to the 8th?

**what can i compare middle school to?**

what can i compare middle school to? (use in metaphor), based on 6th, 7th, and 8th grade. for example playing monopoly 6th grade - buying properties, 7th grade- adjusting to the game, 8th grade - stress over money

**need help**

There are 205 students in the middle school. If 41 students are girls in 8th grade, what percent of the middle school do the girls in 8th grade represent?

**math**

A school has 6th, 7th and 8th period Social Studies classes. One student from each class will be chosen to represent the school in an essay contest. The 6th period finalists are Mike, Sara, Luis and Ed. The 7th period finalists are Ben, Eric, and Sandy. The 8th period ...

**Math 3 grd**

How do I find the area and the volume of a prism using base-10 blocks? well, the area is found by multiplying length x width. so it would be 10 x 10, which equals 100. The volume, however, isn't much more work to find the answer. Volume=length x width x height... which means ...

**Math Unit Geometry Test 8th Grade**

Does anybody know the answers for the geometry unit test, 8th grade ?

**Algrebra and Math**

Can you help me answer this question? I'm confused, and show me how you did it, that way I can understand on how to solve it more? The total number of students in 8th Grade is 32, including Fran and Billy, Who are one of the female and male students respectively. Fran has ...

**Math grd 12**

You are setting a system programing codes for a universal TV remote control. Each code will have five digits and cannot include a 0 or repeat any digits. How many codes a)do not contain a 7? b)have 3 as the third digit, and 5 as the fifth digit c)begin with an even digit? d)...

**Chemistry grd 12**

for the below questions the food samples were onion juice, cornflakes, egg, milk, salad dressing and instant oatmeal. 1) Why are you required to wear safety eye wear and protective clothing while conducting an investigation of testing food samples for proteins,starch,sugar and...

**Math grd 12**

The number of nuts in a package of Nutty's premium cashews is normally distributed with mean of 432.4 nuts and standard deviation of 5.8 nuts packages with fewer than 420 nuts or more than 445 nuts will be rejected by quality control a) what is the probability that a package ...

**Pre-Algebra**

Find each product or Quotient. Express using exponents. 1. The quotient of a to the 8th power and a to the 8th power? a 2. The quotient of -x to the 5th power and -x? -x to the 4th power 3. (15/5)(n to the 9th power/ n)? 3n go the 10th power Neutral water has a pH of 7. Each ...

**Math**

Theo made the table below to show the number of middle school students who attented the last football game. if this data were displayed in a circle graph, how many degrees would be in the sector representing the 8th grade Grades 6,7,8 # of students in 6th grade: 375 7th grade...

**Business studies**

Hi, my question involves listing assets and liabilities for week ending 14th of January for a plumbing company. The plumber has bought some tools on the 8th but is not paying for them until the 23rd. Would I need to list the tools as a fixed asset (as they benifit the company)...

**science**

Is venus the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th or 9th smallest planet? Also is it the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th or 9th largest planet?

**8th grade**

what is x-y=6

**8th grade**

n+3=12

**8th grade**

-5+(5)

**8th grade**

a=1m,b=3m

**8th grade**

how do you do 9-y=1.5x?

**8th grade**

4+6x-9x=3x

**algebra 8th**

-4.7-(-4.7) = 0 ???

**8th Math**

-5x-10 = 2-(x+4)

**Math 8th gr.**

27 - (-9) (-2) ÷ 3 * (-4) - 0 - 33 - (-39)

**Math 8th gr.**

27 - (-9) (-2) ÷ 3 * (-4) - 0 - 33 - (-39)

**8th grade**

what is radiation

**8th grade**

what percent of 60 is 15

**8th grade**

what's the answer to .5x-y=8

**8th grade**

What is domain?

**8th math(Algebra)**

what is 8a+b=1 8a-3b=3

**8th grade**

how do you simplify: 3x+6 ---- 3x^2

**8th Grade Math**

If x/y=4, x-y=9, and y-x=-9, what is x & y?

**8th Grade Math**

If x/y=4, x-y=9, and y-x=(-9) then what is x and y?