CHEMISTRY HIGH SCHOOL

Which of the following is the largest volume? 4.5 x 102 m3
4.5 x 107 cm3
4.5 x 104 dm3
5.0 x 108 mm3

Answers

Answer 1
Answer:

if you convert all of the following metrics to m^3. Then the first one is the largest number. I know this stuff did it last year

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Which compound has the highest percent composition by mass of strontium?

Answers

Assuming all the compounds of interest are given. We proceed on the theoretical way of answering this question. Assume 1 gram of each compound. Multiply it by the reciprocal of the molar mass of the compound. Then multiply it by the molar ratio of the Strontium to the compound. Then, multiply it by the molar mass of strontium. Finally divide this answer by 1 gram and multiply by 100. 

Density is a measure of an object's _____ per unit _____.

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Density is a measure of an object's mass per unit volume.

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Density is a mesjre of an objects mass per u it volume

Quick chem question!

I’ll mark BRAINLIEST!!!!! :)

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What is the question

When farmers irrigate their crops, as much as 60 to 70 percent of the water _____. is ruined by pests, such as rabbits that are around the crops never reaches the crop is taken up by the plant is already contaminated by lead pipes

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Answer:

Option (2)

Explanation:

The water in most of the region is generally pumped out of the ground for the purpose of irrigation. This rate of pumping is much higher than the rate of replenishment. The over-pumping of water leads to the lowering of the water table

About 60 to 70% of the water that is used for irrigation purposes does not reach the crop. It is because the water most of the time gets percolated down into the deeper zones. In addition to this, the water also leaks through the fractures that are associated with the canals and increasing rate of evaporation.

Thus, the correct answer is option (2).

Answer:b never reaches the crop hopefully helps

Explanation:

Consider the following reversible, exothermic chemical reaction: 2C2H2(g) + 5O2(g) ↔4CO2(g) + 2H2O(g) All BUT one of the conditions will cause equilibrium to shift right and produce more of the products. Which change will cause the reaction to shift to the left?
A) adding oxygen
B) adding CO2
C) increasing the pressure
D) decreasing the temperature

Answers

Answer : The correct option is, (B) adding CO_2

Explanation :

Le-Chatelier's principle : This principle states that if any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

Option A : adding oxygen

If the concentration of O_2 is increased on reactant side then the equilibrium will shift in the direction where decrease of concentration of O_2 takes place. Therefore, the equilibrium will shift in the right direction.

Option B : adding CO_2

If the concentration of CO_2 is increased on product side then the equilibrium will shift in the direction where decrease of concentration of CO_2 takes place. Therefore, the equilibrium will shift in the left direction.

Option C : increasing the pressure

If the pressure of the container is increased then the equilibrium will shift in the direction where the less number of moles of gas molecules is taking place. As the number of moles of gas molecules is greater at the product reactant side and less at product side. So, the equilibrium will shift in the right direction.

Option D : decreasing the temperature

As the given reaction is an exothermic reaction in which the heat is released during a chemical reaction. That means the temperature is decreased on the reactant side. If the temperature is decreased in the equilibrium then the equilibrium will shift in the direction where, temperature is getting increased. Thus, the reaction will shift to the right direction i.e, towards the product.
Adding CO2 increases Q and makes Q > K (K being the equilibrium constant for this reaction).  As a result, the reaction will favor reactants until Q=K, so adding CO2 causes the reaction to proceed to the left.  B is the correct answer.
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