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2 years ago

(Dear brainly, you can't delete this question caue its about school work too)

Chemistry

2 answers:

NeTakaya2 years ago

5 0

Answer:

70% to 100% is the highest grade, a mark of Distinction. 60% to 69% earns a Merit. 50% to 59% is Pass.is what im guessing and if your grade is 90.5 and has lowerd or hasn't that is ok because it might lower to a c but i advise to work better and if it is just a 90.5 overall including the test score that is fine nbut you will pass is what im think

Explanation:

Try better next time :) hope i help so you pass im ptretty sure and if you dont just be a tryhard

STatiana [176]2 years ago

4 0

I don’t understand your question but It looks like the another person answered it already did

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Can i have help with this ???

Andreas93 [3]

Answer:

section 2

Explanation:

it has the shiny silver apperance but at the same time is hard and brittle

8 0

2 years ago

Hydrogen Peroxide, H2O2, in the presence of a catalyst decomposes into water and oxygen gas. How many L of O2 at STP are produce

Korolek [52]

Answer:

There is 11.2 L of O2 produced

Explanation:

Step 1: Data given

Molar mass of H2O2 = 34.01 g/mol

Molar mass of O2 = 32 g/mol

Mass of H2O2 = 34.0 grams

Step 2: The balanced reaction

2H2O2 → 2H2O + O2

Step 3: Calculate number of moles H2O2

Moles H2O2 = Mass H2O2 / Molar mass H2O2

Moles H2O2 = 34 grams / 34.01 g/mol

Moles H2O2 = 1 mol

Step 4: Calculate the number of moles at the equilibrium

Initial number of moles H2O2 = 1 mol

Initial number of mol H2O and O2 = 0 mol

Since the mol ratio H2O2 H2O O2 is 2:2:1

There will react x mol of H2O2; X mol of H2O and 0.5 x mol of O2

At the equilibrium, H2O2 has (1-x) mol. Since it's decomposed into H2O and O2, we know x =1 mol

At the equilibrium, there is 1 mol H2O and 0.5 mol O2

Under STP, 1 mol of gas has a volume of 22.4 L

This means 0.5 moles of O2 has a volume of 22.4*0.5 = 11.2 L

There is 11.2 L of O2 produced

4 0

3 years ago

What important thing to understand about fitness?

Oksana_A [137]

Answer:

There are many benefits to being fit.

Explanation:

Fitness isn't just about the physical part but also the mental wellbeing. For example the physical involves exercising, not just to lose weight or look more beautiful (remember everyone has unique looks) but to live longer, reduce the rick of diseases such as heart diseases and to enhance our bodies. Whereas the mental has to do with the brain, how you train the brain e.g logic puzzles, riddles and so on.

3 0

2 years ago

In an experiment, 26.5 g of metal was heated to 98.0°c and then quickly transferred to 150.0 g of water in a calorimeter. the in

allsm [11]

This is a common laboratory experiment called calorimetry which determines the specific heat capacity of the sample metal.

By the Conservation of Energy,

Energy of Metal = Energy of Water
mCmetalΔT = mCwaterΔT, wherein Cwater = 4.187 J/g·°C
(26.5 g)(Cmetal)(98 - 32.5°C) = (150 g)(4.187 J/g·°C)(32.5 - 20°C)
Solving for Cmetal,
Cmetal = 4.523 J/g·°C

4 0

3 years ago

How many atoms are in 5.33 x 10-5 mol C?

Alex Ar [27]

Hey there!

There are 6.022 x 10²³ atoms in one mole.

We have 5.33 x 10⁻⁵ moles.

(5.33 x 10⁻⁵) x (6.022 x 10²³)

3.21 x 10¹⁹

There are 3.21 x 10¹⁹ atoms in 5.33 x 10⁻⁵ mol C.

Hope this helps!

3 0

2 years ago