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3 years ago

Insects interact with other living organisms carrying pollen and diseases true or false

Chemistry

1 answer:

MA_775_DIABLO [31]3 years ago

3 0

Answer:

True

Explanation:

Because of a mosquito, for example, they carry diseases they interact with other organisms.

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deff fn [24]

Answer:

In first shell 2 electrons are present and 7 electrons are present in last shell

Explanation:

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3 years ago

What is heat energy in science

Ket [755]

Answer:

Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. the transfer or flow from one object to another is called heat.

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3 years ago

You have 100 g of Pb(NO3)2. How many moles is this?

topjm [15]

Answer:

0.302 moles

Explanation:

Data given

Mass of Pb(NO₃)₂ = 100 g

Moles of Pb(NO₃)₂ = ?

Solution:

To find mole we have to know about molar mass of Pb(NO₃)₂

So,

Molar mass of Pb(NO₃)₂ = 207 + 2[14 + 3(16)]

= 207 + 2[14 + 48]

= 207 + 124

Molar mass of Pb(NO₃)₂ = 331 g/mol

Formula used :

no. of moles = mass in grams / molar mass

Put values in above formula

no. of moles = 100 g / 331 g/mol

no. of moles = 0.302 moles

no. of moles of Pb(NO₃)₂ = 0.302 moles

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3 years ago

Is alcohol evaporating a chemical or physical change

snow_tiger [21]

Physical change , the states are changing from liquid to gas

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3 years ago

Which lists the structures, in correct order, through which light passes when it enters the eye?

Mashutka [201]

Answer:

cornea, pupil, lens, vitreous humor

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3 years ago