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3 years ago

A substance can absorb or release heat energy by the process of

1 answer:

3 0

<span>A substance can absorb or release heat energy by the process of radiation, convection, or conduction. Radiation refers to the transfer of energy through emission of electromagnetic waves or the movement of particles. An example of radiation is the Sun’s rays. This type of heat transfer does not require direct contact between objects. Convection, on the other hand, involves the hotter fluid rising while the colder fluid sinks. Convection occurs when you boil water in a pan. Lastly, conduction is a heat transfer that occurs as a result of temperature difference between two objects in contact. Heat is transferred from the hotter region to the colder region. Conduction occurs when ice melts in your hands. </span>

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An isotope with a mass number of 193 has 116 neutrons. What is the atomic number of this

Zinaida [17]

Answer:

Atomic number of this isotope = 77

Explanation:

Given that,

Mass number = 193

No of neutrons = 116

We need to find the atomic no of this isotope.

We know that,

Atomic mass = No of protons + No. of neutrons

Also, atomic no = no of protons

So,

Atomic mass = atomic no + No. of neutrons

⇒ Atomic no = Atomic mass - no of neutrons

Atomic no = 193 - 116

Atomic no = 77

Hence, 77 is the atomic no of the isotope.

6 0

4 years ago

The partial pressure of carbon dioxide in air varies with the seasons. Would you expect the partial pressure in the Northern Hem

Stels [109]

Answer:

It will be higher in the summer.

Explanation:

Usually, the winter season is more harsh a weather on leaves than summer because it is wet season and thus has less sunlight and this means there will be less photosynthesis reactions and therefore it means the partial pressure will be lesser here unlike in the summer when it is a more warm and dry weather with sunlight where photosynthesis reactions will be more favorable to occur.

Thus, CO2 which is a great component of photosynthesis is used more in the summer and as such the partial pressure in the summer will be higher.

4 0

3 years ago

Francium is an extremely rare alkali metal, many of whose physical properties

bazaltina [42]

Answer:

136 neutrons

87 protons

Explanation:

A neutral atom have equal number of protons and neutrons. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The number of protons or number of electrons are the atomic number of an atom while the number of protons and number of neutrons are the mass number of an atom. Every atom consist of nucleus or a positive center. The protons and neutrons are present with in the nucleus while electrons are present out side the nucleus. All these three subatomic particles construct an atom.

Example:

In Francium the number of proton and neutron can be found by subtracting the atomic number of francium from its atomic mass. The atomic number will be the number of protons and remaining will show the total number of neutrons present in nucleus.

Atomic number is 87

Atomic mass 223

223- 87 = 136

So number of neutrons are 136 and number of protons are 87.

6 0

3 years ago

If a bag of peas weighs 454 grams, how many peas would be in the bag?

OverLord2011 [107]

In a bag of peas that weighs 454 grams, there are between 1261 and 4540 peas.

The average pea weighs between 0.1 and 0.36 grams.

If we take the lower value (0.1 g/pea), the number of peas in 454 g is:

$454 g \times \frac{1pea}{0.1 g} = 4540pea$

If we take the higher value (0.36 g/pea), the number of peas in 454 g is:

$454 g \times \frac{1pea}{0.36 g} \approx 1261pea$

In a bag of peas that weighs 454 grams, there are between 1261 and 4540 peas.

You can learn more about conversion factors here: brainly.com/question/1844638

6 0

3 years ago

Write net ionic equations for the reaction, if any, that occurs when aqueous solutions of the following are mixed. ammonium sulf

aleksandr82 [10.1K]

Answer:

See explanation for details

Explanation:

ammonium sulfate and barium nitrate Answer ‍

Ba2+(aq) + SO4^2-(aq) ----------> BaSO4(s)

lead(II) nitrate and sodium chloride Answer ‍

Pb2+(aq) + 2Cl-(aq) -----------> PbCl2(s)

copper(II) chloride and sodium hydroxide Answer ‍ ‍ ‍ ‍ ‍

Cu2+(aq) + 2OH-(aq) -------------> Cu(OH)2(s)

There can only be a net ionic reaction when a precipitate is formed as the two solutions are mixed together.

4 0

3 years ago