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3 years ago

10

HELP!!!!!!!!!!!!!!!!!!!!!

2 answers:

Sergio [31]3 years ago

6 0

Its d. white reflects light.

alexgriva [62]3 years ago

5 0

d because black absorbs and white reflects light

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A 51.9 g sample of quartz is put into a calorimeter (see sketch at right) that contains 300.0 g of water. The quartz sample star

Trava [24]

Answer:

The specific heat capacity of quartz is 0.71 J/g°C.

Explanation:

Heat lost by quartz will be equal to heat gained by the water

$-Q_1=Q_2$

Mass of quartz= $m_1=51.9 g$

Specific heat capacity of quartz= $c_1=?$

Initial temperature of the quartz= $T_1=97.8^oC$

Final temperature = $T_2=T = 19.3^oC$

$Q_1=m_1c_1\times (T-T_1)$

Mass of water= $m_2=300.0 g$

Specific heat capacity of water= $c_2=4.18 J/g^oC$

Initial temperature of the water = $T_3=17.0 ^oC$

Final temperature of water = $T_2=T=19.3^oC$

$Q_2=m_2c_2\times (T-T_3)$

$-Q_1=Q_2$

$-(m_1c_1\times (T-T_1))=m_2c_2\times (T-T_3)$

On substituting all values:

$-(51.9 gc_1\times (19.3^oC-97.8^oC))=300.0 g\times 4.18 J/g^oC\times (19.3^oC-170^oC)$

we get:

$c_1 =0.7079 J/g^oC\approx 0.71 J/g^oC$

The specific heat capacity of quartz is 0.71 J/g°C.

5 0

3 years ago

Prokaryotic cell division is a___________process involving onc chromosom.

Trava [24]

Answer:

It’s is a simple

Explanation:the prokaryotic cell involves a simple process which intern involves one chromosom

5 0

3 years ago

69g of sodium reacts with chlorine to produce sodium chloride. calculate the number of moles of chlorine required to react with

Rus_ich [418]

Answer:

3 moles of $Cl^{-}$ is needed for $Na^{+}$ to be fully consumed.

Explanation:

For the balanced equation:

$Na^{+} + Cl^{-}$ ⇒ $NaCl$

First, find the moles of Na corresponding to the 69g used the general definition of mol:

$mol Na^{+} = \frac{69 g}{23 g/mol } = 3mol$

We observe that the equation is balanced and the stoichiometric ratio between them is 1: 1.

According to this, one mole of Na will react with one mole of Cl.

3 moles of $Cl^{-}$ is needed for $Na^{+}$ to be fully consumed.

7 0

3 years ago

I NEED HELP PLEASE, THANKS!

Xelga [282]

Answer:

See explanation

Explanation:

In the scientific method, you always begin with asking a question. Then, you do research, make a hypothesis, and test that hypothesis based on the initial question. If experimental data does not support your hypothesis, then you can restart by asking a new question, based on what you already know. Hope this helps!

5 0

3 years ago

Describe the way the moon moves in space?

Scilla [17]

Gravitational Pull, is the answer. just like we orbit the sun, the moon orbits us. we act almost like a magnet, we follow the biggest guy as leader. if the sun dissapeared, we would die, but probably, we would start to revolve around jupiter as it is the biggest

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3 years ago