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3 years ago

According to Newton’s Third Law, if someone jumps off a skateboard, the skateboard will roll backwards because -

Chemistry

1 answer:

Andrej [43]3 years ago

5 0

Answer:

for the force that sent the person forward, there is an equal force pushing back on the skateboard

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Which group of the periodic table contains two elements that are gases at stp?

Svetradugi [14.3K]

The group is might be labeled as VIIB or VIIA.

3 0

3 years ago

What is the oxidation number of each phosphorus atom in H4P2O7

nekit [7.7K]

Answer:

Explanation:

The oxidation number of phosphorus can be obtained as follows:

H4P2O7 = 0

4(+1) + 2P + 7(—2) = 0

4 + 2P —14 = 0

Collect like terms

2P = 14 — 4

2P = 10

Divide both side by 2

P = 10/2

P = +5

The oxidation number of phosphorus is +5

7 0

3 years ago

You have come down with a nasty cold and would like to understand why the virus that infected you is making you feel so lousy. W

umka21 [38]

Answer:

a) The volume is 5.236x10⁻¹³L

b) The molarity of a single virus is 1.91x10¹² mol/L

c) The molarity for a 100 virus particles is 1.91x10¹⁴ mol/L

Explanation:

a) Given:

D = diameter of the cell = 10 μm

r = radius = 10/2 = 5 μm

The volume of the spherical cell is equal:

$V=\frac{4}{3} \pi r^{3} =\frac{4}{3} \pi *(5)^{3} =523.6\mu m^{3}$

If 1 μm³ = 1x10⁻¹⁵L, then 523.6 μm³ = 5.236x10⁻¹³L

b) The molarity is:

$M=\frac{number-of-moles}{volume-of-solution}$

For a single virus within the cell

$M=\frac{1}{5.236x10^{-13} } =1.91x10^{12} mol/L$

c) For a 100 virus particles the molarity is:

$M=\frac{100}{5.236x10^{-13} } =1.91x10^{14} mol/L$

4 0

3 years ago

A book rests on a table. The book pushes downward on the table with a force of 8N. According to Newton's 3rd Law of Motion, what

Tems11 [23]

Answer:

The table is preventing the book from accelerating downwards.

Explanation:

7 0

3 years ago

How many moles of Fe are in 235.45g of Fe

Elena-2011 [213]

We are given with an element Iron, Fe, with a mass of 235.45 g. We are tasked to solve for its corresponding molar mass in mol. We need to find first the molecular weight of Iron, that is
Fe= 55.845 g/mol
With 235.45 g sample, its corresponding mol is

mol Fe= 235.45 g x 1 mol/55.845 = 4.22 mol Fe
Therefore, molar mass of Iron is 4.22 mol

3 0

3 years ago