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3 years ago

The parent element 247 95 am decays by beta decay which daughter element will formn

1 answer:

6 0

Atomic mass of the parent element =247,
atomic number of the parent element = 95

In the process of β-decay electron leaves the nucleus, so instead of one neutron we get one proton.

Mass of proton≈mass of neutron,
so atomic mass will not change.

Charge of proton =+1, and charge of neutron = 0.
So, we will get atomic number increased by one.

New element (daughter) will have
atomic mass = 247,
and atomic number= 95+1=96

Number 95 - Am (parent),
number 96 - Cm(daughter),

So, from Am-247 we will get Cm-247.

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A solution has a pOH of 8.20. What is the concentration of H3O+?

Allisa [31]

The correct answer is B. $1.6\times 10^{-6}$

Explanation

The question provides us with information about the concentration of $[OH^{-} ]$ and we are supposed to use this information to find the $[H^{+} ]$ concentration. The pH of a solution gives us information about $[H^{+} ]$

If we the reaction is in equilibrium and with standard conditions of 25°C, then pH is given by the formula

$14 = pH + pOH\\\implies pH= 14 - pOH= 14-8.20= 5.8$ .

Once we find the pH we use the relationship $pH= -log[H^{+} ]$ , then the $[H^{+} ]$ ,is given by

$pH = -log[H^{+} ]\\\implies [H^{+} ]= 10^{-pH} = 10^{-5.8}= 1.58 \times 10^{-6}$

3 0

3 years ago

Calcium reacts with hydrochloric acid,HCI, to make calcium chloride and hydrogen gas (H2).

aleksandr82 [10.1K]

Answer:

1.)calcium+hydrochloric acid -->calcium chloride +hydrogen

2.)Ca + 2HCl -->CaCl2 + H2

3.)3.55g

Explanation:

1.) pretty self explanatory

2.)Ca + HCl -->CaCl2 + H2

then balance

Ca + 2HCl -->CaCl2 + H2 (+2 infront of Hcl)

3.) take calcium and calcium chloride

Ca + CaCl2

then you need the relative atomic mass of both

Ca=40

CaCl2=71 (40+(35.5x2))

Ca=40 40/40=1 1x2=2g

Then repeat that exact equation for calcium chloride

CaCl2=71 71/40=1.775 1.775x3=3.55g

3 0

3 years ago

Describe the relationship between"q" and energy in the melting of an ice cube.

klio [65]

Answer:

Now "q" is the heat and energy is the capacity of any object or body ton perform any work. So we can relate them if we take the term specific heat in consideration.

As specific heat is the the amount of heat required to raise the temperature of an object in specific from one degree Celsius, for ice it is 2.108 kJ/kgK.

Explanation:

c = specific heat capacity,

q = heat

ΔT = change in temperature

So, we have:

C= Q/ΔT

It is the ratio of the amount of heat energy transferred to an object to the resulting increase in temperature of the object.

4 0

3 years ago

Using two different instruments I measured the length of my foot to be 27 centimeters and 27.00 centimeters. Explain the differe

Sophie [7]

Answer:

As you used two diferent instruments, one is more sensitive than the other.

Explanation:

The sensitivity of an instrument is the minimum amount of magnitude that can be differentiate a measurement system.

In method A, you got 27 cm, so if in method B, you got 27.00, method B is more sensitive. It's like saying that one system measures more than the other

8 0

3 years ago

Mercury, which is sometimes used in thermometers, has a density of 13.534 g/ml at room temperature. what volume of mercury conta

Sergeu [11.5K]

D - density: 13,534 g/ml
m - mass: 10g
V - volume: ??
_____________
d = m/V
V = m/d
V = 10/13,534
V = 0,7389 ml

:•)

6 0

3 years ago