12/22/17

you put 0.025 kg of water at 21.5 degrees C into a kettle and convert it all into steam. How much energy was required to heat the water to 100.0 degrees C?
I need to know how to solve this problem. I have an exam tomorrow and i need to know how to do this type of problem. 
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12/20/17

what is mitosis
What is mitosis  
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Lab

12/19/17

Empirical formula of the oxide of tin
Hhgghjbb bnbgccccc bbjb. Hbggh bbhfxc ddssyh huh. Hhggcvvbbbbvvvvv b high. Hhgghhbb bhhhhhhb 
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12/18/17

How many pounds of candy that sells for $0.88 per lb must be mixed with candy that sells for $1.34 per lb to obtain 7 lb of a mixture that should sell for $0.93
In need of help
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12/18/17

A 150 ml solution of 0.75 M HBr(aq) acid is bolied evaporating the water reducing the solution down to 85 ml
a explain what would happen to concentration of solution  b explain how you would expect the ph to change
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12/18/17

If 38.0 ml of 1.25 M sulphuric acid solution reacts with a 27.5 ml of 0.5 M solution containing BaCl2
a write a balanced chemical equation  b determine the theoretical yield of solid in reaction  c if 2.5 g of was actually produce, determine percent yield of reaction 
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12/18/17

Write a balance chemical reaction for this and explain why this words using the solubility tables
Vinegar (C2H4O2) is added to kettle to remove lime (CaCo3) bulid up 
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12/18/17

Is significant figure important for atomic radius calculations?
Is significant figure important for atomic radius calculations?Calculate the radius of a vanadium atom, given that V has BCC crystal structure, a density of 5.96g/cm3, and an atomic weight of... more
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12/18/17

Jacob drove 305 miles while using 9 gallons of gas. How many miles can he drive with 1 gallon of gas?
 I have wanted to know this for a whale so i felt bad when i could not remember how to do that
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12/18/17

It is an advantage for two species to share the same niche
Biology it is a biopsy question that I need help on please help true or false
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12/17/17

Can you tell from the formula of a substance whether the bonds are likely to be ionic or molecular in nature?
is it possible, or is it not? WHY?
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12/17/17

Atomic Physicist vs Chemist
Does atomic physicist deal with atomic radius of an atom? Imagine that we're calculating the atomic radius of iridium with given density and atomic weight. Who has better knowledge atomic physicist... more
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12/16/17

Question is about entropy
There are two gases A and B. Temperature of both gases is increased,but keeping the volume of gas A constant and pressure of gas B constant. What happens to entropy ,does Entropy of A increases or... more
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12/15/17

Which of the following cell parts is found in only eukaryotic cells?
Which of the following cell parts is found in only eukaryotic cells? Cell membrane Ribosomes Nucleus Cytoplasm
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12/15/17

Wavelength of musical notes
1.An F note has a frequency of 698.46 Hz. Calculate its wavelength in meters.2.A G note has a frequency of 783.99 Hz. Calculate its wavelength in meters.3.An E note has a frequency of 659.26 Hz.... more
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12/15/17

Driving from Texas to California The total mileage estimate please
    driving from Texas to California and a 2016 Scicon car putting $20 in gas for feel driving 1000 and 200 something miles what would be the total estimate please
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12/14/17

Chemistry Homework
You have 37.0 mL of a 0.400 M stock solution that must be diluted to 0.100 M. Assuming the volumes are additive, how much water should you add?   ? = mL
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12/14/17

Chemistry Concentration
What is the concentration of a solution made by diluting 85 mL of 6.0 M HCl to a final volume of 750 mL?   ? = M
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12/14/17

Mass Chemistry
The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common.   How many grams of sucrose are... more
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12/14/17

Calculate mass of aluminum cup
An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 438-g sample of silver at an initial temperature of 89°C is placed in the water. The stirrer is used to stir the... more
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12/14/17

How do I work out surface area to volume ratio ( for biology )
I'm unsure on how to work out the surface area to volume ratio
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12/14/17

One number added to three times another number is 24. Five times the first number added to three times the other number is 36. Find the numbers
Solve word problem using system of equations. Use elimination 
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12/14/17

You drink a beverage with 84mg of caffeine. Each hour , the caffeine in your system decreases by about 8%. How long until you have 10mg of caffeine?
You drink a beverage with 84mg of caffeine. Each hour, in your system decreases by about 8%. How long until you have 10mg of caffeine?
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12/14/17

Antigen and antibody
What is difference between antibody and antigen
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12/14/17

rachel drove 195 miles in 3 hours if she continues driving at the same rate how far will she drive 7 more hours
 i need so much help with thise can ou help me plece
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