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Sloan [31]
3 years ago
5

SOMEONE PLS HELP ITS FOR A TEST!!

Chemistry
2 answers:
n200080 [17]3 years ago
8 0
4 is true and 5 is true
Damm [24]3 years ago
6 0

Explanation:

4=true

5. true

hope this helps. good luck with your test.

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What allowed Mendeleev to make predictions of undiscovered elements
Andrej [43]

Answer:

he predicted the properties from known elements above and belws the unknown in the same group

Explanation:

What allowed Mendeleev to make predictions of undiscovered elements

He realized that an element on this table with one known element above it and one known  element below it had to have properties between the two known elements

How did Mendeleev predict gallium and germanium?

Based on gaps in the periodic table Mendeleev deduced that in these gaps belonged elements yet to be discovered. Based on other elements below and above in the same group he predicted the existence of eka-aluminum, eka-boron, and eka-silicon, later to be named gallium (Ga), scandium (Sc), and germanium (Ge).

3 0
2 years ago
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Which of the following is true for compounds?
soldi70 [24.7K]
Compound are formed by two or more elements chemically combined. For example: H^2O is the water formula, this is a compound because you two elements which are Hydrogen and Oxygen and together they form a compound. The (^2) is the amount of atoms the formula has, in this case Hydrogen has two atoms and Oxygen is neutral.
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Best example of heterogeneous mixture
barxatty [35]

Answer: Hello, Oil and water form a heterogeneous mixture.

Orange juice with pulp is a heterogeneous mixture. ...

Sandy water is a heterogeneous mixture. ...

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4 0
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Please help I don’t know if my answer is right!!
Temka [501]

Answer:

neutralization reaction! Aka: option C!

HOPE THIS HELPS! :)

Explanation:

8 0
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0.5 kg or 0.5 lb which is a larger quantity
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The correct answer is 0.5 kg If you whant me to explaine pls tell me
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