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2 years ago

The density of an object is 1.23 g/cm3. In which of the following materials will it float?

2 answers:

7 0

In order to float the demsoty of the floating obkect must be lower then the liquid it is in. the only one that works for is Citric acid

Oliga [24]2 years ago

6 0

Answer: The correct option is Citric acid which has a density of $1.660 g/cm^3$

Explanation: Density plays an important role to determine whether a substance will float or sink.

A substance will float when its density is less than the density of liquid in which it is placed.

And the substance will sink, if it is placed in the liquid having less density than its own.

Density of object = $1.23g/cm^3$

And we are asked in which liquid will it float, hence the liquid having higher density than the object will make the object float.

Hence, the correct option is Citric acid having density $1.660g/cm^3$

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C3H8 + 5 O2 → 3 CO2 + 4 H2O What is the number of atoms on each side of the equation?

Roman55 [17]

Answer: 1.2642*10²⁵ on both sides

Explanation:

First check how many moles are there on each side.
Since this is a balanaced equataion the number of moles on each side is the same thus the number of atoms is also same on both sides

There are 3 moles of carbon and 8 moles of hydrogen in C3H8
and 2 moles of oxygen in O2 but there 5 infront so 2*5 is 10
Number of moles on the right is 10+8+3 = 21

Now use Avogrado's constant

21 Moles* (6.02*10²³)/Mol
= 21*6.02*10²³

= 1.2642*10²⁵

6 0

1 year ago

Read 2 more answers

Find [cu2+] in a solution saturated with cu4(oh)6(so4) if [oh − ] is fixed at 2.3 ✕ 10−6 m. note that cu4(oh)6(so4) gives 1 mol

ki77a [65]

$Cu_4(OH)_6(SO_4)$

You have OH- conc = 2.3 ✕ 10−6 m
From the formula, you can observe the ratio of Cu2+ to OH- is 4 : 6 = 2:3

So, for 2.3 ✕ 10−6 m OH-
[Cu2+] = $\frac{2}{3} \times 2.3 \times 10^{-6}$

$= 1.53 \times 10^{-6} 
$

6 0

3 years ago

Two basic properties of the liquid phase

melamori03 [73]

Fixed density
Particles move smoothly

6 0

3 years ago

Which chemical bonds are found within water molecules?

Anni [7]

D. Hydrogen chemical bonds are found within water molecules.

4 0

2 years ago

At rest, a neuron has a lower concentration of sodium than the surrounding fluid. The neuron also has a higher concentration of

pshichka [43]

Answer:

a. Remaining at rest requires the use of ATP.

Explanation:

The resting membrane potential is maintained by the sodium-potassium pump. The sodium potassium pump does this by actively pumping sodium ions out of the cell and potassium ions inside the cell in a ratio of 3:2. This movement of ions by the sodium-potassium pump is against their concentration gradient. In a neuron at rest, there are more sodium ions outside the cell than there are inside the cell. Also, there are are more potassium ions inside the cell than there are outside the cell. However, there are ion channels through which these ions enter and leave the cell. Sodium ion channels allow sodium to enter the cell following its concentration gradient, whereas, potassium ion channels allow potassium to leave the cell following its concentration gradient. However, more potassium ions leave the cell than do sodium ions enter the cell because of the higher permeability of the cell to potassium ions.

In order to maintain the resting membrane potential, the sodium potassium pump powered by the hydrolysis of an ATP molecules pumps sodium ions out of the cell and potassium ions into the cell.

Therefore, the correct option is A, as ATP is needed by the sodium-potassium pump in order to maintain the resting membrane potential.

6 0

2 years ago