Which quantity is equivalent to 50 kilocalories

Chemistry

1 answer:

Tanya [424]3 years ago

7 0

I believe this problem have these following choices:

5,000 cal

0.05 cal

5 x 10^3 cal

5 x 10 ^4 cal

Now 1 kilocalorie = 1000 calories, therefore:

50 kilocalories * (1000 calories / 1 kilocalorie) = 50,000 calories

Since there are 4 zeroes, so the scientific notation is:

5 x 10 ^4 cal (ANSWER)

You might be interested in

Please Help!!!!!!!!!!!!!!

defon

Answer:

i can't see it

Explanation:

8 0

2 years ago

Read 2 more answers

What must occur for a change to be a chemical reaction? a. There must be a change in chemical properties. b. There must be a cha

sergey [27]

Answer:

A. There must be a change in chemical properties.

At least 2 or 3 atoms must change for it to be considered chemical. There must be some type of reactants that will change this. Otherwise, it's not a chemical reaction.

Hope this helps!

8 0

1 year ago

Research the compositions of Pennies. What was the composition of each of your Pennies prior to treatment

LenKa [72]

Answer:

History of composition

Years Material Weight (grains)

1944–1946 gilding metal (95% copper, 5% zinc) 48 grains

1947–1962 bronze (95% copper, 5% tin and zinc) 48 grains

1962 – September 1982 gilding metal (95% copper, 5% zinc) 48 grains

October 1982 – present copper-plated zinc (97.5% zinc, 2.5% copper) 38.6 grains

7 0

1 year ago

Calculate the number of grams of sodium chloride in the solution. (Hint: Remember that sodium chloride is a strong electrolyte.)

creativ13 [48]

The question is incomplete, here is the complete question:

A solution contains 0.115 mol $H_2O$ and an unknown number of moles of sodium chloride. The vapor pressure of the solution at 30°C is 25.7 torr. The vapor pressure of pure water at this temperature is 31.8 torr. Calculate the number of grams of sodium chloride in the solution. (Hint: Remember that sodium chloride is a strong electrolyte.)