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3 years ago

Define and then describe the difference between a polar covalent bond, nonpolar covalent bond and ionic bond.

1 answer:

3 0

Polar covalent bond- a bond where atoms are unevenly shared due to a larger difference in electronegativity of the bonded elements.

Non-polar covalent bond- These are bonds between elements with a low difference in electronegativity. Electrons are shared equally in these bonds between the elements.

Ionic bonds- have such large difference in electronegativity that they take/give electrons to the element they are bonded to. They do not share electrons at all. Bonds between a non-metal and a metal.

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Scientist think that many species have one common ancestor. Which answer choice best tells why scientists think this way?

BigorU [14]

Answer:

homologous structures.

Explanation:

If you look at many different organisms, you will see similar structures. Like humans have a forearm, birds have a wing, whales have fins, leopards have legs. The bones evolvolved to fit the animal

3 0

3 years ago

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

3 years ago

Where are stars from in the spiral galaxy

zzz [600]

Stars form in the regions with the densest gas.

6 0

3 years ago

A student observed a chemical reaction take place in an insulated calorimeter.CaO + H2O + Ca(OH)2The student noted that the temp

mixer [17]

First, let's remember the concepts of spontaneous and nonspontaneous reaction:

A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. This would be called an exothermic reaction, it releases energy.

A nonspontaneous reaction is a reaction that does not favor the formation of products at the given set of conditions. In order for a reaction to be nonspontaneous, it must be endothermic, accompanied by a decrease in entropy, or both.

In this case, when the reaction takes place, the temperature of the system increases which means that heat is released and heat is a form of energy. Energy is released.

The answer based on this logic would be D.

6 0

1 year ago

For the following reaction, 5.80 grams of hydrogen sulfide are mixed with excess oxygen gas. The reaction yields 2.21 grams of w

Nata [24]

Answer:

See Bottom!

Explanation:

Wouldn't that create a fire reaction?

I'm not 1000% sure, but I do think so!

5 0

3 years ago