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3 years ago

An ion with an atomic number of 34 and 36 electrons has a __________ charge

1 answer:

5 0

negative charge. The atomic number of 34 tells you immediately that the ion has 34 protons. Since it also has 36 electrons, it has 2 more electrons than needed to be neutral. So the ion will have a negative charge since electrons have a negative charge.

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Small quantities of hydrogen and helium gas at the same temperature are released simultaneously at one end of a laboratory. Stat

olga2289 [7]

Answer:

hydrogen

Explanation:

it diffuses faster compared to helium since it is less dense

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3 years ago

How many atoms are in 4 H2PO4

olya-2409 [2.1K]

Answer:

Explanation:

just add p has 1 o has 4 and h has 2

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3 years ago

A gas at 127०C and 10.0 L expands to 20.0 L. What is the new temperature in Celcius? (HINT: You need to convert to Kelvins solve

Snowcat [4.5K]

Answer:

526.85K

Explanation:

Based on Charles's law, the volume of a gas is directly proportional to absolute temperature. The formrula is:

V₁ / T₁ = V₂ / T₂

Where 1 represents the initial state and 2 the final state of the gas

Using the values of the problem:

V₁ = 10.0L

T₁ = 127°C + 273.15K = 400.15K

V₂ = 20.0L

Thus, replacing in the formula:

10.0L / 400.15K = 20.0L / T₂

T₂ = 800K

In Celsius:

800K - 273.15 = 526.85K

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4 years ago

The number 4.30 x 107 has significant figures.

777dan777 [17]

Answer: 4 sig figs

Explanation:

4.30 x 107=

4*107+0.30*107=

428+32.10=460.1 ==> 460 + 1 ==> 3 + 1=4 sig figs

6 0

2 years ago

How many liters of hydrogen are obtained from the reaction of 4.00 g sodium with excess water, at STP?

Lana71 [14]

Answer:

V = 1.95 L.

Explanation:

Hell there!

In this case, according to the following reaction between sodium metal and water:

$2Na+2H_2O\rightarrow 2NaOH+H_2$

We can realize that the moles of hydrogen can be calculated by using the initial mass of sodium, its atomic mass (23.0 g/mol) and the 2:1 mole ratio of sodium to hydrogen to obtain:

$4.00gNa*\frac{1molNa}{23.0gNa} *\frac{1molH_2}{2molNa}=0.0870molH_2$

Finally, we calculate the volume of hydrogen by using the ideal gas equation whereas the pressure is 1 atm and the temperature 273.15 K according to the STP conditions:

$PV=nRT\\\\V=\frac{nRT}{P}\\\\V=\frac{0.0870mol*0.08206\frac{atm*L}{mol*K}*273.15 K}{1 atm}\\\\V=1.95L$

Regards!

5 0

3 years ago