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nadezda [96]
3 years ago
6

"uses for simple machines" whats a piano that needs to be moved up to a third floor apartment

Chemistry
1 answer:
STALIN [3.7K]3 years ago
5 0

Answer:

Pulley

Explanation:

You can't the piano up the stairs, you need to something to bring it up

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How many liters of 4.0 M NaOH solution will react with 1.2 mol H2SO4? (Remember to balance the equation.)
nydimaria [60]

Answer:

The answer is D. 0.60 L

Explanation:

The balanced reaction equation including states of matter is;

H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l)

More simple:

H2SO4 + 2NaOH → Na2SO4 + 2H2O

Now, we can see from this reaction equation that the mole ratio of NaOH to H2SO4 is 2:1

Number of moles of H2SO4 reacted = 1.2 moles

Hence;

2 moles of NaOH reacts with 1 mole of H2SO4

x moles of NaOH reacts with 1.2 moles of H2SO4

x = 2 * 1.2/1 = 2.4 moles of NaOH

Recall that;

Number of moles = Concentration * Volume

Volume = number of moles/concentration

Volume of NaOH  is obtained from;

Volume = 2.4 moles/ 4.0 M

Volume =  0.60 L

6 0
3 years ago
Read 2 more answers
A meal containing a burger, fries, and a milkshake contains 53.0 grams of fat, 38.0 grams of protein, and 152 grams of carbohydr
RSB [31]

Answer:

286 minutes

Explanation:

Given the content of fat in a meal= 53g

the content of protien in a meal= 38g

the content of carbohydrate in a meal= 152g

Also given that fuel value of protien = 17 KJ/g

the fuel value of fat = 38 KJ/g

the fuel value of carbohydrate = 17 KJ/g

Now to burn all the molecules the energy recquired is content of molecule times the fuel value.

the energy recquired to burn fat = 53\times 38=2014KJ

the energy recquired to burn protien = 38\times 17=646KJ

the energy recquired to burn carbohydrate =152 \times 17=2584KJ

The total energy=2014+646+2584=5244KJ

The energy spent on swimming is 1100KJ/hour

for 1 hour 1100 KJ are spent

to spend 5244 KJ of energy the time taken is = \frac{5244}{1100}=4.76hours

We know 1 hour=60 minutes

The total time = 4.76\times 60=286minutes

6 0
4 years ago
What is hydrolysis?​
harkovskaia [24]

Answer:

Hydrolysis is any chemical reaction in which a molecule of water ruptures one or more chemical bonds.

Explanation:

Example:

Dissolving a salt of a weak acid or base in water is an example of a hydrolysis.

8 0
4 years ago
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What 2 solutions could help restore the ecosystem back to normal?
Pavel [41]
  • Renewable energy and energetic efficiency. ...
  • The electric vehicle. ...
  • Greater environmental control. ...
  • Air purifiers. ...
  • Graphene filter for water. ...
  • Food sovereignty and agroecology. ...
  • Sustainable development.
6 0
3 years ago
What happens when a student/ classmate gets Sulphuric in there eyes?
agasfer [191]

Answer:

don't try this in lab

Explanation:

  1. it can irritate eyes and cause burning
  2. swelling and tearing of eyes
  3. blurred vision and may cause blindness
4 0
2 years ago
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