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valina [46]
3 years ago
11

*finished the test its B* In a science lab, a student heats up a chemical from 10 °C to 25 °C which requires thermal energy of 3

0000 J. If mass of the object is 40 g, the specific heat capacity of the chemical would be
Group of answer choices


100 J /g* °C


50 J /g* °C *its this one*


75 J /g* °C


25 J /g* °C
Chemistry
1 answer:
Illusion [34]3 years ago
8 0

Answer:

Yup! The answer is 50 J/g* °C

Explanation:

I also took the test but I know how to work out the problem for anyone who wants to know how to solve it.

Remember the formula q = m*C*ΔT

m = the mass in grams

C = the specific heat Capacity

ΔT = change in time

q = amount of energy

So, find out what was given and what we need to look for:

m = 40 g

C = ?

ΔT = we're heating up (the temperature increases) a chemical so it needs to be a positive number. 25 - 10 = 15 °C

q = 30000 Joules

Now, set up the equation:

q = m*C*ΔT

30000 = 40 * C * 15

Multiply 40 and 15 to get 600:

30000 = 600 * C

Divide both sides by 600 to get C by itself (plug this into your calculator):

30000/600 = 600 * C/600

You are left with 50 = C

Now, you just need to plug in the units to get B. 50 J/g* °C

I hope I helped clear up any confusion! :D

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Write a balanced half-reaction for the oxidation of gaseous nitric oxide to aqueous nitrous acid in acidic aqueous solution. Be
Bad White [126]

Explanation:

Reaction for oxidation of gaseous nitric oxide to aqueous nitrous acid is as follows.

            NO(g) \rightarrow HNO_{2}(aq)

By adding water, we will balance the oxygen atoms on both the sides as follows.

          NO(g) + H_{2}O(l) \rightarrow HNO_{2}(aq)

Now, we will balance the hydrogen atoms by adding H^{+} ions as follows.

         NO(g) + H_{2}O(l) \rightarrow HNO_{2}(aq) + H^{+}(aq)

Now, we will add OH^{-} ions on both the sides in order to neutralize H^{+} ions.

      NO(g) + H_{2}O(l) + OH^{-}(aq) \rightarrow HNO_{2}(aq) + H^{+}(aq) + OH^{-}(aq) ..... (1)

We will combine the H^{+} and OH^{-} ions in order to form water in equation (1) and cancelling the common terms as follows.

            NO(g) + OH^{-}(aq) \rightarrow HNO_{2}(aq)

Now, we will balance the charge on both the sides as follows.

         NO(g) + OH^{-}(aq) \rightarrow HNO_{2}(aq) + 1e^{-}

Thus, we can conclude that the balanced half-reaction equation is as follows.

         NO(g) + OH^{-}(aq) \rightarrow HNO_{2}(aq) + 1e^{-}

4 0
3 years ago
An object of mass 0.5 kg is swung in uniform circular motion. The radius is 2 meters, and the force exerted is 4 N. Calculate th
ZanzabumX [31]

Answer:

8 m/s²

Explanation:

m = 0.5kg

r = 2m

F = 4 N

f=  \frac{ {mv}^{2} }{r}

make v the subject

v =  \sqrt{( \frac{fr}{m}) }

v = √(4×2)/0.5

v = √16

v = 4 m/s

a =   \frac{ {v}^{2} }{r}

a = 4²/2

a = 16/2

a = 8 m/s²

7 0
3 years ago
Beaches along the eastern and western coasts of North America are composed chiefly of quartz grains.
lidiya [134]
I think the answer is true. These beaches are composed mostly with sandstone which is mainly sand-sized minerals. These grains is made up of quartz and feldspar since these are the most common mineral found in Earth.
3 0
3 years ago
How many moles of no2 are equivalent to 74.3g of no2
AfilCa [17]
<h3><u>Answer;</u></h3>

= 1.615 moles

<h3><u>Explanation</u>;</h3>

The molar mass of NO2

 = 46.01 g/mol

The mass of NO2 given is 74.3 g

Number moles = mass/ molar mass

                        = 74.3 g/ 46.01 g/mol

                       = 1.615 moles

6 0
3 years ago
Read 2 more answers
When magnesium chloride (MgCl2) dissolves in water, it dissociates into magnesium ions and chloride ions. How many moles of ions
timama [110]

0.448 moles of ions will form when a 42.66-gram sample of magnesium chloride is dissolved in water (option A).

<h3>How to calculate number of moles?</h3>

According to this question, when magnesium chloride (MgCl2) dissolves in water, it dissociates into magnesium ions and chloride ions as follows:

MgCl2(aq) ⟶ Mg2+(aq) + Cl−(aq)

However, if a 42.66-gram sample of magnesium chloride is dissolved in water, this means that 42.66g/molecular mass of MgCl2 will be the number of moles of the ionic products.

molecular mass of MgCl2 = 95.3g/mol

moles = 42.66g ÷ 95.3g/mol = 0.448mol

Therefore, 0.448 moles of ions will form when a 42.66-gram sample of magnesium chloride is dissolved in water.

Learn more about moles at: brainly.com/question/26416088

#SPJ1

7 0
2 years ago
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