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belka [17]
3 years ago
9

4. Which of the following have mass? Select all that apply.

Chemistry
1 answer:
valkas [14]3 years ago
4 0
All of these EXCEPT helium in a balloon
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1. Write chemical reaction of burning of magnesium
shtirl [24]

Answer:

1.Mg+O2.......MgO2

Explanation:

2.Very reactive towards halogens and reacts with water at room temperature. 3, Magnesium oxide is a simple basic oxide. 4.It will react with water to form magnesium hydroxide which is a base turning red litmus to blue 5.should be white. hope it helped. I help people although when I post a question it is left unanswered and then gets answers after two days when I don't really need it

4 0
3 years ago
¿De dónde se originan los rayos alfa, Beta y gamma?
KATRIN_1 [288]
La radiación alfa consiste en núcleos de helio-4 (4He) y es detenida fácilmente por una hoja de papel. La radiación beta, que consiste en electrones, es detenida por una placa de aluminio. La radiación gamma es finalmente absorbida cuando penetra en un material denso.
5 0
3 years ago
What is one practical use of the paper battery
love history [14]

Answer:

A paper battery can work even if it is folded, cut or rolled up. A Paper battery consists mainly of carbon and paper; it can be used to power pacemakers within the body. A paper battery can be used both as a capacitor and battery. It is an ultra-thin storage device.Oct 10, 2014

Explanation:

5 0
3 years ago
Question 8 of 25
lozanna [386]
B. An early form of chemistry that people used to try to turn metal.

6 0
3 years ago
Aluminum hydroxide + nitric acid ➡ aluminum nitrate + water
m_a_m_a [10]

Answer:

Chemical equation:

HNO₃ + Al(OH)₃   →  Al(NO₃)₃ + H₂O

Explanation:

Chemical equation:

HNO₃ + Al(OH)₃   →  Al(NO₃)₃ + H₂O

Balanced chemical equation:

3HNO₃ + Al(OH)₃   →  Al(NO₃)₃ + 3H₂O

Ionic equation:

3H⁺ + 3NO⁻₃(aq) + Al(OH)₃(s)   →  Al³⁺(aq) + 3NO₃⁻¹(aq) + 3H₂O(l)

Net ionic equation:

Al(OH)₃(s)  +  3H⁺(aq)     →  Al³⁺(aq) +  3H₂O(l)

The NO⁻₃ are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

4 0
3 years ago
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