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3 years ago

¿Cuáles son las características de los materiales de laboratorio? Por ejemplo: exactitud, resistencia a la temperatura, etc.

Chemistry

2 answers:

ira [324]3 years ago

6 0

No se perdón que no pueda ayudar:(

irina [24]3 years ago

4 0

Answer:

gfchjklnmbvh

Explanation:

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What might be a long term benefit for the nation from space exploration. A. Taxes will be slower. B. More people will be interes

strojnjashka [21]

B. sounds like the most reasonable answer.
With an increase of people studying space exploration and sharing their discoveries, then it is likely for it to inspire other people in study science as well.

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3 years ago

BRAINLIESTTT ASAP!!! PLEASE HELP ME :)

Alex_Xolod [135]

It is the 3rd option. Theories must be substantiated by a large amount of evidence and previous research

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4 years ago

When scientists look at these examples, what do they know about the atoms? Carbon-12 Carbon-14

lorasvet [3.4K]

Carbon-12 and Carbon-14 are isotopes of Carbon. Although they have the same number of protons, the <span>number of neutrons in each atom is not the same~</span>

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4 years ago

2. A 10.0 g ice cube, initially at 0.0ºC, is melted in 100.0 g of water that was initially 20.0ºC. After the ice has melted, the

arlik [135]

Answer:

The heat lost by the water $Q_{water} =$ 3.8 KJ

The heat gain by ice $Q_{ice}$ = 228.76 J

The heat required to melt the ice $Q_{melt}$ = 3340 J

Explanation:

Mass of ice cube $m_{ice}$ = 10 gm

Initial temperature of ice cube $T_{ice}$ = 0 °c

Mass of water $m_{water}$ = 100 gm

Initial temperature of water $T_{w}$ = 20 °c

Final temperature of mixture $T_{f}$ = 10.93 °c

(a). Total heat lost by the water $Q_{water} =$ $m_{water}$ $C_{w}$ ( $T_{f}$ - $T_{w}$ )

⇒ $Q_{water} =$ 100 × 4.184 (20 - 10.93)

⇒ $Q_{water} =$ 3.8 KJ

This is the heat lost by the water.

(b). Heat gained by the ice cube $Q_{ice}$ = $m_{ice}$ $C_{ice}$ $(T_{f} - T_{ice} )$

⇒ $Q_{ice}$ = 10 × 2.093 × ( 10.93 - 0)

⇒ $Q_{ice}$ = 228.76 J

This is the heat gain by ice.

(C). Heat required to melt the ice $Q_{melt}$ = $m_{ice}$ × Latent Heat

⇒ $Q_{melt}$ = 10 × 334

⇒ $Q_{melt}$ = 3340 J

This is the heat required to melt the ice.

7 0

3 years ago

An element X forms a compound XH 3 with hydrogen. Another element Y forms a compound YX 2 with X. Given that the valency of hydr

Marina CMI [18]

X $H_{3}$
H has a positive 1 charge. This means that having 3H = +3<span>. This is a neutral compound so x= -3 because X+3H= 0

Y</span> $X_{2}$ is also neutral so 2X+Y= 0
we know X=-3 So, 2(-3)+Y=0
-6+y=0
Y=+6 charge

Answer: The valency of X is -3. The valency of Y is 6

7 0

4 years ago