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timurjin [86]
3 years ago
13

Which sample is a pure substance?

Chemistry
2 answers:
Drupady [299]3 years ago
6 0

Answer:

a test tube of zinc and oxygen

Explanation:

i just did on edgen

Tema [17]3 years ago
3 0
A test tube of zinc oxide
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Which statement describes the ocean floor?
Keith_Richards [23]

Answer: C

Explanation: The ocean floor is largely unexplored so no one knows what it is like.

4 0
2 years ago
is it true or false that all atom´s electrons can interact with the electrons of other atom to form bonds
Sveta_85 [38]
False. only valence electrons can bond with other atoms' electrons.
3 0
3 years ago
25.0 mL of nitrous acid (HNO2) is titrated with a 1.235 M solution of KOH. The equivalence point (stoichiometric point) is obser
tatuchka [14]

Answer:

0.456 M

Explanation:

Step 1: Write the balanced neutralization equation

HNO₂ + KOH ⇒ KNO₂ + H₂O

Step 2: Calculate the reacting moles of KOH

9.26 mL of 1.235 M KOH react.

0.00926 L × 1.235 mol/L = 0.0114 mol

Step 3: Calculate the reacting moles of HNO₂

The molar ratio of HNO₂ to KOH is 1:1. The reacting moles of HNO₂ are 1/1 × 0.0114 mol = 0.0114 mol.

Step 4: Calculate the initial concentration of HNO₂

0.0114 moles of HNO₂ are in 25.0 mL of solution.

[HNO₂] = 0.0114 mol / 0.0250 L = 0.456 M

3 0
3 years ago
How many significant figures are in the measurement 811.40 grams?
igomit [66]
There are 5 significant figures in this number because the zero counts and it  comes after a number and on the right of the decimal point 
3 0
3 years ago
Read 2 more answers
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Vikentia [17]

Answer:

A

Explanation:

I think it is A because a dinosaurs are extinct so it wold be possible to find a dinosaur fossil in the coal mine.

6 0
2 years ago
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