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3 years ago

What is the difference between “mass number” and “atomic mass”? which is found on the periodic table?

1 answer:

4 0

Mass number is the number of protons and neutrons in an atom, and it tells us about the mass of the atom in amu, or atomic mass units. Atomic mass is the average mass of all the isotopes of a certain type.

Mass number found on the periodic table

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During a new moon, the moon is

IgorLugansk [536]

It is A. This is because, according to your diagram, the sunlight hits the moon, and it is blocking some of the sunlight to reach the Earth. This means that it is in between both of them.

4 0

3 years ago

Two 0.75 Amp loads are connected in parallel with a 2500 Milliamperehour Ni-Cd battery. Approximately how long can the battery p

nikdorinn [45]

Explanation:

It is given that two loads have 0.75 Ampere current each. And, they contain 2500 milli ampere per hour Ni-Cd battery.

As both the loads are connected in parallel. Hence, total current will be calculated as follows.

I = $I_{1} + I_{2}$

= 0.75 A + 0.75 A

= 1.5 A

= $1.5 A \times \frac{1000 mA}{1 A}$

= 1500 mA

Relation between time and capacity of battery is as follows.

Capacity = Current × time (in hour)

therefore, time = $\frac{Capacity}{Current}$

= $\frac{2500 mA. h}{1500 A}$

= 1.667 hr

Thus, we can conclude that the battery provide power to the load up to 1.667 hours.

4 0

3 years ago

Carbon dioxide in the atmosphere can be reduced by _.*

pychu [463]

Answer:

As the use of plants as carbon sinks can be undone by events such as wildfires, the long-term reliability of these approaches has been questioned. Carbon dioxide that has been removed from the atmosphere can also be stored in the Earth's crust by injecting it into the subsurface, or in the form of insoluble carbonate salts (mineral sequestration).

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Explanation:

6 0

2 years ago

Read 2 more answers

Shifts in the rock layer locations cannot account for gaps in the rock record true or false

vivado [14]

Answer: That would be false because it is the contact between two layers representing a gap in the geologic record, usually from the erosion of the layers which would normally be expected to appear.

Explanation:

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4 0

3 years ago

Can somebody help me with this also plz

just olya [345]

ANSWER:

4 a) Specific elements have more than one oxidation state, demonstrating variable valency.

For example, the following transition metals demonstrate varied valence states: $Fe^{2+}$ , $Fe^{3+}$ , $Cr^{2+}, Cr^{3+}$ , etc.

Normal metals such as $Pb^{2+} and Pb^{4+}$ also show variable valencies. Certain non-metals are also found to show more than one valence state $Pb^{3+} and Pb^{5+}.$

4 b) Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.

For example, Carbon-14 is a naturally occurring radioactive isotope of carbon, having six protons and eight neutrons in the nucleus. However, C-14 does not last forever and there will come a time when it loses its extra neutrons and becomes Carbon-12.

5 a) $2Fe + 3Cl_2$ → $2FeCl_3$