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labwork [276]
3 years ago
8

ANSWER ASAP PLZ???????????????????????????????????

Chemistry
2 answers:
Furkat [3]3 years ago
7 0

Answer:

The answer should be A

Explanation:

sattari [20]3 years ago
7 0

Answer:

Leaving a Copper penny in vinegar until it turns green

Explanation:

the others are physical changes. when copper penny is put in vinegar, a reactive oixde layer is formed which is green in colour. namely, Cu(II) acetate.

The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes. Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.

You might be interested in
When forming ions, both gallium and sulfur take on the same electron configuration as what element​
guapka [62]

Answer:

GaS

Explanation:

GaS is Gallium and Sulfuric Acid.

Melting point = 965°C

Appearance: Yellow crystal

Density: 3.86 g / cm³

I hope this helps you :)

8 0
3 years ago
25.0 mL of an LiOH solution were titrated with 29.15 mLof a 0.205 M H3PO4 solution to reach the equivalence point. What is the m
borishaifa [10]

Answer:

0.717 M LiOH

Explanation:

(Step 1)

Calculate the moles of H₃PO₄ using the molarity equation.

29.15 mL / 1,000 = 0.02915 L

Molarity = moles / volume (L)

0.205 M = moles / 0.02915 L

0.00598 = moles

(Step 2)

Convert moles H₃PO₄ to moles LiOH using the mole-to-mole ratio from reaction coefficients.

1 H₃PO₄ + 3 LiOH -----> Li₃PO₄ + 3 H₂O
^                ^

0.00598 moles H₃PO₄            3 moles LiOH
------------------------------------  x  --------------------------  =  0.0179 moles LiOH
                                                  1 mole H₃PO₄

(Step 3)

Calculate the molarity of LiOH using the molarity equation.

25.0 mL / 1,000 = 0.0250 L

Molarity = moles / volume (L)

Molarity = 0.0179 moles / 0.0250 L

Molarity = 0.717 M

7 0
2 years ago
The sliding filament model of contraction states that __________.
alexdok [17]
In the sliding filament model of muscle contraction, the myofilaments slide over each other, resulting in the overlapping of actin and <span>myosin. Hope this helps. Have a nice day. Feel free to ask more questions. Thank you.</span>
4 0
3 years ago
the isotope of an atom contaning 40 protons and 51 neutons suddenlyhas 2 neutrons added to it. What isotope is created?
matrenka [14]

An isotope with 53 neutrons

3 0
3 years ago
Can someone help? This question is very difficult for me
stich3 [128]
<h3>Solution:</h3>
  • According to law of conservation of matter, mass of reactants = mass of product formed.
  • Here, mass of hydrogen = 30 grams
  • Mass of oxygen = 30 grams
  • Hydrogen + Oxygen = Dihydrogen monoxide
  • Therefore, Mass of hydrogen + Mass of oxygen = Mass of Dihydrogen Monoxide
  • So, 30 grams + 30 grams = 60 grams.
  • So, 60 grams of dihydrogen monoxide is present in the product.
<h3>Answer:</h3>

A. 60 grams

Hope it helps

3 0
3 years ago
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