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3 years ago

11

If your speed was 100 m/h and the distance was 50 miles how long did the car drive?

1 answer:

Vitek1552 [10]3 years ago

8 0

50 divided by 100= 0.5 x100 = 50

So I think it’s 50 minutes sorry if it’s wrong.

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How does an atom of one element differ from the atom of another element?

Temka [501]

Explanation:

The atoms of one element differs from the atoms of other elements in terms of the number of protons they contain. This is often taken as the atomic number of such an atom.

The number of proton is the best indicator of the atom one is dealing with.
Based on this number, elements are categorized into distinct columns and rows on the periodic table.
The atomic number is the number of protons or positively charge particles in the atom.

II.

It is possible to change the identity of an atom. This is only possible by altering the atomic number of the atom.

Only nuclear reactions have this capability.

When an atom undergoes nuclear reaction that involves change in number of protons, transmutation occurs and a new atom forms.

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3 years ago

Which species is the conjugate base of an ammonium ion, NH4+?

SIZIF [17.4K]

Answer:

The conjugated base of ammonium ion $NH_{4}^{+}$ is $NH_{5}^{2+}$

Explanation:

A conjugate base is obtained by addition of proton $H^{+}$ . In order to get the conjugate base of $NH_{4}^{+}$ , we need to add a proton to ammonium ion. We will get $NH_{5}^{2+}$ after addition of proton to ammonium ion.

Hence, the conjugate base of $NH_{4}^{+}$ is $NH_{5}^{2+}$

3 0

4 years ago

A scientist took notes about the fossil in the picture.

Dimas [21]

Answer:

b. forest ....

I think ansesters also lived in forest by wearing leaves like their clothes .... etc

6 0

3 years ago

When a 0.235-g sample of benzoic acid is combusted in a bomb calorimeter, the temperature rises 1.643 ∘C . When a 0.275-g sample

andrew-mc [135]

Answer : The heat of combustion per mole of caffeine at constant volume is 76197.18 kJ/mole

Explanation :

First we have to calculate the specific heat calorimeter.

Formula used :

$Q=m\times c\times \Delta T$

where,

Q = heat of combustion of benzoic acid = 26.38 kJ/g = 26380 J/g

m = mass of benzoic acid = 0.235 g

c = specific heat of calorimeter = ?

$\Delta T$ = change in temperature = $1.643^oC$

Now put all the given value in the above formula, we get:

$26380J/g=0.235g\times c\times 1.643^oC$

$c=68323.38J/^oC$

Thus, the specific heat of calorimeter is $68323.38J/^oC$

Now we have to calculate the heat of combustion of caffeine.

Formula used :

$Q=c\times \Delta T$

where,

Q = heat of combustion of caffeine = ?

c = specific heat of calorimeter = $68323.38J/^oC$

$\Delta T$ = change in temperature = $1.584^oC$

Now put all the given value in the above formula, we get:

$Q=68323.38J/^oC\times 1.584^oC$

$Q=108224.23J=108.2kJ$

Now we have to calculate the moles of caffeine.

$\text{Moles of caffeine}=\frac{\text{Mass of caffeine}}{\text{Molar mass of caffeine}}$

Mass of caffeine = 0.275 g

Molar mass of caffeine = 194.19 g/mole

$\text{Moles of caffeine}=\frac{0.275g}{194.19g/mole}=0.00142mol$

Now we have to calculate the heat of combustion per mole of caffeine at constant volume.

$\text{Heat of combustion per mole of caffeine}=\frac{108.2kJ}{0.00142mol}=76197.18kJ/mole$

Therefore, the heat of combustion per mole of caffeine at constant volume is 76197.18 kJ/mole

4 0

3 years ago

Which state borders California now México nevada and Utah?

vladimir1956 [14]

Arizona
It is surrounded by California, New Mexico, Nevada, Utah, and Mexico

3 0

3 years ago

Read 2 more answers