CHEMISTRY HIGH SCHOOL

Use exponential notation to express the number 385,500 ha. one significant figure.
b. two significant figures.
c. three significant figures.
d. five significant figures.

Answers

Answer 1
Answer: To express the number 385,500 hours using exponential notation with a specific number of significant figures, you can use the following steps:

a. One significant figure:
- Expressing 385,500 as 3.9 × 10^5 hours (rounded to one significant figure).

b. Two significant figures:
- Expressing 385,500 as 3.9 × 10^5 hours (rounded to two significant figures).

c. Three significant figures:
- Expressing 385,500 as 3.86 × 10^5 hours (rounded to three significant figures).

d. Five significant figures:
- Expressing 385,500 as 3.8550 × 10^5 hours (rounded to five significant figures).

Keep in mind that the exponential notation represents the same value but with the specified number of significant figures.

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Which bond is most polar? A) N -H
B) C -H
C) O -H
D) H -H
Can anyone explain this one?

Answers

 A) N is more polar because of it electron negativity charge ex. N electron negativity charge is 3.0 and H is 2.1 
 B) C is more polar...electron negativity for C is 2.5 AND H is 2.1 
 C)O is more polar dues to it electron negativity charge being greater that hydrogen 
 D)H and H are both non polar because they cancel each other out due to the face the both share the electron negativity evenly 
 C .. ectronegativity values for each of the atoms but if you didn't know these you can just look at your periodic table and see where they are in relation to each other

A rigid cylinder contains a sample of gas at STP. What is the pressure of this gas after the sample is heated to 410 K?(1) 1.0 atm (3) 0.67 atm
(2) 0.50 atm (4) 1.5 atm

Answers

Answer:(4) 1.5 atm

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

(P_1V_1)/(T_1)=(P_2V_2)/(T_2)

where,

P_1 = initial pressure of gas at STP= 1 atm

P_2 = final pressure of gas = ?

V_1 = initial volume of gas at STP = V L

V_2 = final volume of gas = V L

T_1 = initial temperature of gas at STP= 273K

T_2 = final temperature of gas = 410 K

Now put all the given values in the above equation, we get the final pressure of gas.

(1atm* VL)/(273K)=(P_2* VL)/(410K)

P_2=1.50atm

Therefore, the pressure of gas will be 1.50 atm.
To solve the problem, we assume the sample to be ideal. Then, we use the ideal gas equation which is expressed as PV = nRT. From the conditions of the gas sample, we calculate the pressure as follows: (NOTE: At STP 1 mol is equal to 22.4 L of a molecule)

P = nRT / V
P = (1 mol) (8.314 Pa m^3/ mol K) (298.15 K) / .0224 L
P = 110660 Pa or 1.0 atm

Thus, the answer is the value in option 1.

Which structure is found in a plant cell but not in a animal cell is ita. chloroplast
b. cell membrane or
c. ribosome

Answers

The one on the left is an animal cell and the one on the right is a plant cell, the answer is chloroplast

Answer:

A.) Chloroplast

Explanation:

Chloroplasts are found in plant cells but not in animal cells. The chloroplast is the organelle that captures light energy and is the site where photosynthesis occurs.

What is the property of flowing very quickly in a liquid?

Answers

The answer is Fluidity.
Fluidity is the physical property that enables a substance to flow. Fluidity also refers to the state of being fluid. So basically, solid molecules has no fluidity.  It is also believed that the fluidity of water increases as the water gets warmer.

Suggest two reasons why the UK government wants to encourage recycling of iron and steel......

Answers

The two reasons why the UK government is encouraging citizens to recycle iron and steel is:
1.   The environment. Every machinery and device the industries makes which includes, infrastructures, mega structures to micro devices. Iron and steel is used. Reducing the extraction of ore and creating steel saves the environment, reduces mining.
2.   Economic reasons. When the ore mining and steel making is reduced in activity, the government won’t just be able to save the environment but it also save funds for other purposes.



Consider the following equation: 4NH₄ + 5O₂ → 4 NO + 6H₂O

How many moles of water are produced when 2 moles of NH4 react with excess Oxygen gas?

Answers

The moles of water are produced when 2 moles of NH4 react with excess Oxygen gas is 4 mole of H2O.

What is moles?

Moles are defined as a common unit used in science to measure vast numbers of extremely small things, such atoms, molecules, or other specific particles.

It can also be defined as a metric in chemistry that is used to describe a very high quantity of molecules, atoms, or particles.

Since we only have two moles of NH4, we switch out four for two.

2 NH4 + 3O2 --> 2NO + 4 H2O

As per the reaction, in order to produce 2 moles of NO2 and 4 moles of H2O, 2 moles of NH4 must react with 3 moles of oxygen gas.

Thus, the moles of water are produced when 2 moles of NH4 react with excess Oxygen gas is 4 mole of H2O.

To learn more about moles, refer to the link below:

brainly.com/question/26416088

#SPJ2
see we have two moles of NH4, so we replace 4 NH4 by 2 NH4.
Now, on balancing the equation, we get 2 NH4 + 3O2 ---> 2NO + 4 H2O (law of conservation of mass)
thus, 2 moles of NH4 react with 3 moles of oxygen gas to produce 2 moles of NO2 and 4 moles of H2O.
Thus, we get 4 moles of H2O 
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