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3 years ago

If a sample of gold is a cube what is the length of each edge in centimeters

1 answer:

4 0

This question cannot be answered in actual centimeters unless at least one edge has a known length however it can be written as (length^3) or (length cubed). As an example if the sample of gold cube had one length of 3cm then all lengths would be 3cm on the cube.

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A sample of magnesium is burned in oxygen to form magnesium oxide. What mass of oxygen is consumed if 74.62 g magnesium oxide is

lana [24]

74.62 g of magnesium oxide is formed from 45.00 g magnesium so 74.62-45.00= 29.62 g of oxygen is consumed or in other words a new compound is formed in the burning of magnesium in oxygen with a heavier mass than the pure magnesium.

3 0

3 years ago

A 52.0 g of Copper (specific heat=0.0923cal/gC) at 25.0C is warmed by the addition of 299 calories of energy. find the final tem

Leto [7]

Answer : The final temperature of the copper is, $87.29^oC$

Solution :

Formula used :

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

where,

Q = heat gained = 299 cal

m = mass of copper = 52 g

c = specific heat of copper = $0.0923cal/g^oC$

$\Delta T=\text{Change in temperature}$

$T_{final}$ = final temperature = ?

$T_{initial}$ = initial temperature = $25^oC$

Now put all the given values in the above formula, we get the final temperature of copper.

$299cal=52g\times 0.0923cal/g^oC\times (T_{final}-25^oC)$

$T_{final}=87.29^oC$

Therefore, the final temperature of the copper is, $87.29^oC$

4 0

4 years ago

Hydrogen bonds within liquid water are attractions between protons and hydroxide ions. are dipole-dipole attractions. are ion-in

barxatty [35]

Answer:

true because the bonds cannot be broken down

6 0

3 years ago

How many moles of hcl are required to neutralize aqueous solutions of these bases? 0.03 mol koh?

oksano4ka [1.4K]

The moles of HCl are required to neutralized aqueous solution of the 0.03 KoH

KOH + HCl = KCl + H2O

by use mole ratio between KOH to HCl which is 1:1 the moles Of HCl is also 0.03 moles

5 0

3 years ago

If a sample of radioactive isotopes takes 60 minutes to decay from 200 grams to 50 grams, what is the half-life of the isotope

qaws [65]

Answer:

I HOPE IT WILL BE YOUR ANSWER:

Explanation:

As given

60 min = 50 gm (1)

then we know half-life mean half amount decay time

so we can write as the half of 200 is 100 gm hence

T 1/2 = 100 (2)

solving these two equation by cross multiplication we will get

T 1/2 = 120 min

THANKS FOR ASKING QUESTION

6 0

3 years ago