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3 years ago

What are the main organs for the respiratory system?

Chemistry

1 answer:

liubo4ka [24]3 years ago

5 0

Answer:

lungs and blood vessels, airway

Explanation:

because the respiratory system are a system that helps people breate. the lungs breathe in oxygen and then breathe out carbon dioxide. the blood vessels carries the oxygen into the body to other part of the system in the body that needed oxygen to make glucose.

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The balanced chemical equation for the reaction between PCl5 and water is given below. If 3.45 moles of HCl are produced, how ma

enyata [817]

The coefficients of the substances give you the ratio of the number of moles.
The 4 before the H2O and the 5 before the HCl tell you that for every 5 moles of HCl created, 4 moles of H2O had to react.

Therefore:
$(3.45mol HCl)(\frac{4 mol H2O}{5 mol HCl})$
can be used to find the moles of H2O that react.

$(3.45mol HCl)(\frac{4 mol H2O}{5 mol HCl}) = 2.76 mol H20$

6 0

3 years ago

When a substance experiences a phase change it is still the same substance, just in a different form. True of or false

forsale [732]

True because its still technically the same substance

8 0

4 years ago

Read 2 more answers

Susan conducts an experiment five times and gets a solution concentration of 1.9M, 2.1M, 1.8M, 1.9M, and 2.2M. The known concent

vlada-n [284]

Answer:

This question is incomplete; the complete part/options is:

A) They are precise, but not accurate.

B) They are accurate, but not precise.

C) They are both accurate and precise.

D) They are neither accurate nor precise

The answer is C.

Explanation:

Accuracy refers to how close a series of measurements is to a known or true value while precision is the closeness of the measurements to one another.

The known concentration of a solution is 2.0M. In an experiment which Susan conducts five times and gets a solution concentration of 1.9M, 2.1M, 1.8M, 1.9M, and 2.2M respectively.

Based on these measured solute concentrations, one would observe that the measured values of: 1.9M, 2.1M, 1.8M, 1.9M, 2.2M are close to one another. This means that the measurements are PRECISE.

Also, the measured values are not too distant from the known value of 2.0M, hence, it can be said that the measurements are ACCURATE.

Therefore, Susan's measurements of the solute concentration are both accurate and precise.

8 0

4 years ago

Question 3 please help :)

andrey2020 [161]

Explanation:

Removing B from the system

- Decreases the rate of the reaction. Backward reaction (formation of reactants) is favoured.

Crushing A into a powder

- Increases the rate of reaction. This is because of the increased surface area of A.

Warming the system

- Increases the rate of the reaction. Temperature is proportional to rate of reaction.

Adding more A to the system

- Increases the rate of reaction. Forward reaction (formation of products) is favoured.

Putting the system into an ice bath

- Decreases the rate of reaction. Temperature is proportional to rate of reaction.

Decreasing the pressure of the system

- Decreases the rate of the reaction.

7 0

3 years ago

How does the nucleus control cellular activity?

eimsori [14]

The nucleus directs all cellular activities by controlling the synthesis of proteins. ... The nucleus contains encoded instructions for the synthesis of proteins in a helical molecule called deoxyribonucleic acid (DNA). The cell's DNA is packaged within the nucleus in a structural form called chromatin.

3 0

3 years ago