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3 years ago

I need help with this:

Chemistry

2 answers:

earnstyle [38]3 years ago

4 0

1 send astronauts to space and saw the earth round

2 saying something to do

3 science that been solved

4 science had have no evidence

5 have proved and stories

Airida [17]3 years ago

4 0

I am pretty sure that all your answers are correct.

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Two disadvantages of using biomass as a source of energy.

murzikaleks [220]

1)Agricultural wastes will not be available if the basic crop is no longer grown.
2.)Land used for energy crops maybe in demand for other purposes, such as faming, conservation, housing, resort or agricultural use.

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4 years ago

If you moved closer and closer to a star, how would its absolute magnitude change?

Goryan [66]

It would actually remain the same nothing will change.

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3 years ago

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How long ago did the Atlantic Ocean separate Canada from Ireland....plz answer I have no idea lol

Naddik [55]

Answer:

Around 150 million years ago

Explanation:

The Atlantic ocean was formed during the Jurassic period

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3 years ago

A block of aluminum weighing 140 g is cooled from 98.4°C to 62.2°C with the release of 1080 joules of heat. From this data, calc

GrogVix [38]

Answer:

Specific heat of a substance is the value that describe how the added heat energy of substance has the impact on its temperature.

Unit is $(\frac {J}{Kg.K})$

C = Q/m. ∆T

C – Specific heat $(\frac {J}{Kg.K})$ 

Q- heat energy (J)

M – Mass (Kg)

∆T- change in temperature (K) 

Explanation:

Given data:

M= 140 g = 0.14 Kg

Q – 1080 Joules.

∆T – 98.4 – 62.2 = 36.2

Substituting the given data in Equation

Specific heat of Aluminium = $\frac {1080}{(0.14 \times 36.2)} = 213.10 (\frac {J}{Kg.K})$

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3 years ago

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Group 2 in the periodic table contains the elements beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), a

Artist 52 [7]

Lose 2 electron to form 2+

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