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3 years ago

What does the element symbol on the periodic table indicate?

1 answer:

6 0

I hope this is right because i just took a chemistry mock exam

The element symbol on the periodic table indicate the states of matter

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What mass in grams of hydrogen is produced by the reaction of 2.0 g of magnesium? (Make sure to balance the reaction first)

denpristay [2]

Answer:

0.164541341 g H2

Explanation:

1) Convert grams to moles by dividing by RMM of Magnesium (24.31g).

2g Mg * (1 mol Mg / 24.31 g Mg) = 0.082270671 mol of Mg

2) Use the balanced equation's ratio of 1 mol Mg: 1 mol H2.

0.082270671 mol of Mg = 0.082270671 mol of H2

3) Convert the mol of H2 back into grams by multiplying by H2's RMM (2 g).

0.082270671 mol of H2 * 2 g H2 = 0.164541341 g H2

* Answer can be rounded to your liking *

7 0

4 years ago

TRUE or FALSE: Any measurement that has been cubed is volume.

zmey [24]

Answer:

True

Explanation:

Volume is measured in "cubic" units. The volume of a figure is the number of cubes required to fill it completely, like blocks in a box. Volume of a cube = side times side times side. Since each side of a square is the same, it can simply be the length of one side cubed.

7 0

4 years ago

Aluminum has a specific heat of 897 j/kg c. methanol has a specific heat of 2450 j/kg c.

Vikki [24]

Answer:

$\sf \: correct \: answer \: would \: be \: methanol!$

Explanation:

Specific Heat: The specific Heat of any material is the heat absorbed or evolved by the material to raise or fall it's temperature by 1°C per unit mass of the material.

The heat absorbed or evolved (Q) is directly proportional to the mass of substance(m) and rise or fall of temp(∆T)

The general formula for specific heat is,

$\sf \: \: \: \: \: s = \frac{Q}{m\Delta T}$

Where

s is specific heat,
Q is the Heat absorbed or evolved
m is mass of substance
& ∆T is change is temperature

Now coming to your question,

The specific heat of Aluminium is 897 J/kg °C

The specific heat of Aluminium is 897 J/kg °C& specific heat of methanol is 2450 J/kg ° C

The definition states that, if the specific heat would be more, more amount of heat will be required for per unit change in temperature.

The specific heat of Aluminium is 897 J/kg °C which means for one kilogram aluminium, 897 Joule energy is required to change it's temperature by 1°C & Similarly for one kilogram methanol 2450 joule energy is required.

Hence, the correct answer would be methanol!

learn more about specific heat here,

brainly.com/question/27365354

brainly.com/question/27598037

$\small \sf \: Thanks \: for \: joining \: brainly \: community!$

7 0

2 years ago

How do I find the volume of a gas at stp if it’s volume is 80.0mL at 109kPa and -12.5 degrees Celsius

Hatshy [7]

all i really know is that STP (standard temperature and pressure) represents conventional conditions established by IUPAC with T = 273.15 K, P = 1 atm . Now putting these values of temperature and pressure at STP, we can calculate easily volume occupied by 1 mol of gas and which comes out to be 22.4 L. hope this helps

4 0

3 years ago

Read 2 more answers

PLEASE HELP ME IM CONFUSED

lisov135 [29]

Given -

T = 450K

∆H = 3000J

∆S = 4J/K

Using formula

∆G = ∆H - T∆S

∆G = 3000- 4*450

∆G = 1200 Joule

∆G is positive so the reaction is non spontaneous!

6 0

4 years ago