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Mademuasel [1]
3 years ago
9

29. Some physical changes involve chemical reactions. TRUE FALSE

Chemistry
1 answer:
Verizon [17]3 years ago
5 0
True. Some physical changes involve chemical reactions. Ice melting is an example of a chemical change in matter
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If you weighed the atoms that appear on the reactant side of the equation, would they have the same mass as the atoms that appea
tatuchka [14]

Answer:

No

Explanation:

If you added the reactants on the reactant side because there is one atom for nitrogen on the product side while there is two atoms on the product side. There are more hydrogen products on the reactant side as well.

3 0
3 years ago
Name the following chemical compound.
Furkat [3]
Answer B

<span>Potassium carbonate .

hope this helps!</span>
6 0
3 years ago
Select all that apply. choose the two correct statements below. the elements of the halogen family are very reactive because: th
Harman [31]
Halogens are a group of elements consisting of Fluorine, Chlorine, Bromine, Iodine and Astatine. In their ionic form, they have a superscript of -1, for example, chloride ion is Cl-1. These means that they readily accept one electron in order to achieve the Octet rule. The Octet rule states that each atom must contain 8 electrons in their valence shell for it to be stable. The most stable set of elements are the noble gases. Because they already fulfill the Octet rule, they no longer take part in reactions. Halogens are also very electronegative, meaning, they attract more electrons toward them. This is also a consequence of the Octet rule.

From the choices, the answers would be:
<span>they require only one electron to complete their outer shell
they have a high electronegativity</span>
6 0
4 years ago
g How many grams of beryllium are needed to produce "11.5" g of hydrogen gas?Be(s) + 2H 2 O(l) → Be(OH) 2 (aq) + H 2 (g)
slega [8]

Answer:

m_{Be}=51.3gBe

Explanation:

Hello,

In this case, with the given chemical reaction:

Be(s) + 2H_2 O(l) \rightarrow Be(OH)_ 2 (aq) + H _2 (g)

We can notice a 1:1 mole ratio between hydrogen gas and beryllium metal, therefore, beryllium requirement is computed as shown below:

m_{Be}=11.5gH_2*\frac{1molH_2}{2.02gH_2} *\frac{1molBe}{1molH_2} *\frac{9.01gBe}{1molBe}\\ \\m_{Be}=51.3gBe

Regards.

6 0
4 years ago
Which diagram correctly describes the changes that occur as a small piece of rock falls from space and hits the earth
worty [1.4K]

Answer:

the motion of gravity

Explanation:

6 0
3 years ago
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