I need to know numbers 6, 7, and 8.

Which organelles surround the cell? Select two options.

rjkz [21]

Cell Wall
Cell Membrane

3 0

2 years ago

Sulfuric acid (H2SO4) reacts with potassium hydroxide (KOH) as follows. H2SO4(aq) + 2 KOH(aq) K2SO4(aq) + 2 H2O(l) Calculate the

8090 [49]

Answer: The volume of $H_2SO_4$ comes out to be 10.2625 mL.

Explanation:

To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2SO_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is KOH.

We are given:

$n_1=2\\M_1=0.100M\\V_1=?mL\\n_2=1\\M_2=0.0821M\\V_2=25mL$

Putting values in above equation, we get:

$2\times 0.100\times V_1=1\times 0.0821\times 25\\\\V_1=10.2625mL$

Hence, the volume of $H_2SO_4$ comes out to be 10.2625 mL.

6 0

3 years ago

For the following compound, determine each element and if the element is a metal or nonmetal. Also determine if the compound has

Artyom0805 [142]

NaCl - also known as sodium chloride or table salt; an ionic bond; it’s a chemical compound, so both
SO2 - also known as sulfur dioxide; a covalent bond; nonmetal
CaO - also known as calcium oxide; an ionic bond; metal
HF - also known as hydrogen fluoride; polar covalent; metal
NO2 - also known as nitrogen dioxide; covalent; nonmetal
H2O - also known as water; covalent; nonmetal

4 0

2 years ago

If the density of an object is 60 g/cm 3 and its mass 20 grams what is its coulume in cm 3

Licemer1 [7]

3 cubic centimeters, Volume= density/ mass

7 0

3 years ago

A mixture of 50.0 mL of ammonia gas and 60.0 mL of oxygen gas react. If all the gases are at the same temperature and pressure,

fredd [130]

Answer:

72.0 mL of steam is formed.

Explanation:

The reaction is :

$4 NH_{3} + 5O_{2} \rightarrow 4NO+6H_{2} O$

You can treat coefficient of compounds as amount of volume used.

Therefore for 4 mL of ammonia 5 mL of oxygen is used to form 4 mL of nitric oxide gas and 6 mL of steam.

For 1 mL of ammonia $\frac{5}{4}$ (=1.25) mL of oxygen is used to form $\frac{4}{4}$ (=1) mL of nitric oxide gas and $\frac{6}{4}$ (=1.5) mL of steam.

OR

Just transform the chemical equation by dividing the whole equation by 4 so that the coefficient of $NH_{3}$ become one like this

$NH_{3} + \frac{5}{4} O_{2} \rightarrow \frac{4}{4}NO+\frac{6}{4}H_{2} O$

We don't know which one will be completely exhausted and which one will be left so we have to consider two cases :

1. Assume ammonia to be completely exhausted

For 50 mL of ammonia $50 \times \frac{5}{4}$ (= 62.5) mL of oxygen is needed. But we have just 60 mL of oxygen so this assumption is false.

2. Assume oxygen to be completely exhausted

For 60 mL of oxygen only $60 \times \frac{4}{5}$ (=48) mL of ammonia is needed. In this case we have sufficient amount of ammonia. So this case is true.

$60\times\frac{4}{5}NH_{3} + 60\ O_{2} \rightarrow 60\times\frac{4}{5}NO+60\times\frac{6}{5}H_{2} O\\\\48NH_{3} + 60\ O_{2} \rightarrow 48NO+72H_{2} O$

Now we know that during complete reaction 48 mL of ammonia and 60 mL of oxygen is used which will form $60 \times \frac{4}{5}$ (= 48) mL of nitic oxide gas and $60 \times \frac{6}{5}$ (= 72) mL of steam.

Therefore 72 mL of steam is formed.

5 0

3 years ago

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