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mr_godi [17]
3 years ago
10

Humans have used rocks in the creation of tools and building materials true or flase

Chemistry
2 answers:
olga55 [171]3 years ago
8 0

Answer:

true

Explanation:

Anuta_ua [19.1K]3 years ago
4 0
True, if you would like an example look at Indian arrow heads or early architecture all use rocks.
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What happens when hydrogen gas is passed over hot ferric oxide​
Roman55 [17]

Answer:

When hydrogen is passed over hot ferric oxide (FeO) hydrogen reacts with oxygen present in the compound and forms water (H2O) and pure Iron

Explanation:

7 0
2 years ago
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When a fuel burns, what determines whether co or co^2 will be produced?
Galina-37 [17]
If it is incomplete or complete combustion. Normally the problems question with tell you.

EX:
"In the presence of plenty of oxygen" is complete combustion
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5 0
3 years ago
Someone please help me sort these out for either if they are Heterogenous, solution, suspension, or colloid. Tuna casserole, gre
Sphinxa [80]
Heterogeneous-a mixture of two or more things
solution-a substance that dissolves
suspension-mixture where solid particles do not dissolve
colloid-does not settle and cannot be seperated

Heterogeneous
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Colloid
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7 0
3 years ago
Which of these is not a covalent molecule?<br> 1. F2<br> 2. CO<br> 3. LiF<br> 4. NH3
beks73 [17]

LiF or lithium fluoride is the non covalent molecule or ionic compound.

Option 3.

<h3><u>Explanation:</u></h3>

Covalent molecules are those molecules which do have actual bonds between the atoms present in the molecule by sharing of the electrons. But in ionic molecules, there's no actual bonds between the atoms, but the oppositely charged ions are attracted towards each other by means of electrostatic force of attraction.

The molecules that are formed by the atoms with high electronegativity and electropositivity are actually ionic because the atoms with high electronegativity are able to actually gain electron readily and the atoms with high electropositivity are actually ready to give the electrons to the electronegative elements.

Lithium is highly electropositive and fluoride is highly electronegative. So they establish an ionic bond. But other molecules like fluorine molecule has both the electronegative elements, Carbon monoxide has carbon which isn't electropositive highly, and ammonia has hydrogen which isn't electropositive.

So lithium fluoride is the ionic compound.

4 0
3 years ago
10 POINTS
Snowcat [4.5K]
E=hc/λ =6.626×10^-34×3 ×10^8 / 3×10^7 × 10^-9 = 6.626×10 ^-24J.
7 0
2 years ago
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