answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
laila [671]
2 years ago
15

Elena has two magnets. She puts one under a piece of paper. She holds the other one above it. The magnets attract each other. Th

is shows that
A) magnets can attract through solid materials.
B) magnets cannot attract through solid materials.
C) magnets must be suspended in air to attract each other.
D) magnets attract when they are placed on top of each other.
Chemistry
1 answer:
Sonbull [250]2 years ago
6 0
A) Magnets can attract through solid materials.
You might be interested in
How many moles of carbon are in 7.87*10^7 carbon atoms
bonufazy [111]
There is 7 moles in C
6 0
2 years ago
Read 2 more answers
Choose all the answers that apply. Lakes are recharged by _____. 1.evaporation 2.precipitation 3.rivers 4.transpiration 5.ground
sweet-ann [11.9K]
2. Precipitation, because when it rains the water that was taken when it was evaporated is replaced and it fills the lake back up
6 0
2 years ago
Read 2 more answers
Caffeine, a molecule found in coffee, tea, and certain soft drinks, contains C, H, O, and N. Combustion of 10.0 g of caffeine pr
denis-greek [22]

Answer:

194 g/mol.

Explanation:

Hello,

In this case, one first must compute the mass of each element as shown below:

C=18.13gCO_2*\frac{12gC}{44gCO_2} =4.945gC\\H=4.639gH_2O*\frac{2.016gH}{18.0152gH_2O}=0.519gH\\N=2.885gN_2\\O=10.0g-4.945g-0.519g-2.885g=1.651gO

Next, the corresponding moles:

C=4.945gC*\frac{1molC}{12gC}=0.412mol\\H=0.519gH*\frac{1molH}{1gH}=0.519mol\\N=2.885gN*\frac{1molN}{14gN}=0.206molN\\O=1.648gO*\frac{1molO}{16gO} =0.103molO

Then, each element's subscripts is found to be:

C=\frac{0.412}{0.103}=4\\H=\frac{0.519}{0.103}=5\\N=\frac{0.206}{0.103} =2\\O=\frac{0.103}{0.103}=1

Therefore, the empirical formula is:

C_4H_5N_2O

Nonetheless, it has a molar mass of 97bg/mol, thereby, by multiplying such formula by 2 one gets:

C_8H_10N_4O_2

Which has a molar mass of 194 g/mol being correctly contained in the given interval.

Best regards.

8 0
2 years ago
A lead cylinder has a mass of 540 grams and a density of 2.70 g/ml. What is its volume
ch4aika [34]
Volume = Mass / Density

Volume = 540g / 2.70 g/ml

Volume = 200 ml 
3 0
2 years ago
Read 2 more answers
The shape of an atomic orbital is associated with
Diano4ka-milaya [45]

The properties of the atomic orbital are actually dependent on the quantum numbers.

size of atomic orbital: governed by the principal quantum number (n)

shape of atomic orbital: governed by the angular momentum quantum number (l)

orientation in space: governed by the magnetic quantum number (ml)

 

Since we are asked about the shape, hence the correct answer is:

angular momentum quantum number (l)

8 0
2 years ago
Other questions:
  • Which element has the greatest density at stp? calcium, chlorine, carbon or copper?
    10·2 answers
  • A student titrates 10.00 milliliters of hydrochloric acid of unknown molarity with 1.000 m naoh. it takes 21.17 milliliters of b
    11·1 answer
  • What is the percentage of water in the following compound? Answer using three significant figures. Sodium carbonate decahydrate,
    7·2 answers
  • Jeremy had a set of 500 toy blocks that could be connected by snapping them together. At first, he used all the blocks to build
    9·2 answers
  • Draw the structures of the starting materials used to synthesize 3-methylbutyl propanoate. (draw the structures in the single sk
    5·1 answer
  • What is the mass of 2.15 liters of N2 gas at STP?
    12·1 answer
  • An empty beaker is weighed and found to weigh 23.1 g. Some potassium chloride is then added to the beaker and weighed again. The
    6·1 answer
  • The coordination number of cation and anion in fluorite CaF2 and antifluorite Na2O are respectively​
    15·1 answer
  • A 0.500 g sample of tin (Sn) is reacted with oxygen to give 0.534 g of product. What is the empirical formula of the oxide?
    12·1 answer
  • 8.45 cm - 3.55 cm = ?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!