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Svetllana [295]
3 years ago
9

Strontium metal is placed in water. write the balanced net ionic equation for the reaction.

Chemistry
1 answer:
VMariaS [17]3 years ago
6 0

Answer:

Sr(s)+2H20(l)--->Sr(OH)2(aq) + H2(g)

(s) denotes a solid

(l) (looks like an I, but it is an L,) denotes a liquid

(g) denotes a gas

(aq) denotes an aqueous solution, just something dissolved in water

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Scientists have discovered a new planet with many craters. Which of the following would be an appropriate hypothesis?
AnnZ [28]
Indicates that the planet does not have an atmosphere. If the planet had an atmosphere is would erode away at the meteors before they hit the surface.
8 0
4 years ago
A compound is composed of 85.6% Carbon and the rest is Hydrogen. The molecular mass of the compound is 42.078g/mol. What is the
s344n2d4d5 [400]

The molecular formula for the compound is  C_{3} H_{6}

<u>Explanation</u>:

As with all of these problems, we assume 100 g of an unknown compound.

And thus, we determine the elemental composition by the given percentages.

Moles of carbon = 85.64 / 12.011

                            = 7.13 mol.

Moles of hydrogen = 14.36 / 1.00794

                               = 14.25 mol.

There are 2 moles of hydrogen per mole of carbon. And thus the empirical formula is CH_{2}.

And molecular formula = n × (empirical formula)

Thus, 42.08 = n × (12.011 + 2 × 1.00794)

And thus n = 3, and molecular formula = C_{3} H_{6}

3 0
3 years ago
How much energy, in joules, is released when 17 kilograms of granite is cooled from 45 C to 21 C?
Lostsunrise [7]
Answer is: <span>D. 327,992.8 J.
</span>m(granite) = 17 kg = 17000g.
ΔT(granite) = 21°C - 45°C = -24°C (-24K).<span>
cp(granite</span>) = 0,804 J/g·°C, <span>specific heat capacity of granite.
Q = m(granite</span>) · ΔT(granite) · cp(granite).<span>
Q = 17000 g ·(-24</span>°C)<span>· 0,804 J/g·K.
Q = -327990 J.
</span>The granite lost 327990 joules of energy.<span>
Q - </span>amount of energy gained or lost.<span> 
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8 0
3 years ago
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How to balance chemical equations
Sonbull [250]
To balance a chemical equation, you want the same amount of elements to equal the same on both sides.

Step1. Write equation out
[CH4 + Cl2 ---> CCl4 + HCl] 
C:1; H:4; Cl:2      C:1; H:1; CL:5   /// Cl = 5 since 4Cl +  1Cl

The Carbon element is balanced, but Hydrogen isn't.
 So to balance it we will add a coefficient behind HCl, so now 

[CH4 + Cl2 ------> CCl4 + 4HCL]
C:1; H:4; Cl:2      C:1; H:4; CL:8 ///// Carbon and hydrogen are balanced, but now Chlorine is not. Now we balance that element by addind a coefficiant behind CL2////

[CH4 + 4Cl2 -----> CCl4 + 4HCl]
C:1; H:4; Cl:8      C:1; H:4; CL:8  ///// So now that we added a 4*Cl2, it equals to Cl:8. So now what most people want to see is if every element is at its lowest balance, so we see if we can any coefficient lower. Just like simplifying if possible. 

8 0
3 years ago
What is electronegativity​
Mama L [17]

Answer:

Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

Its symbol is the Greek letter chi: χ

The higher the electronegativity, the greater an atom's attraction for electrons.

Below is a periodic table of electronegativity: the lighter the shade of green, the higher the electronegativity. Gray means no value is known. (Click image for larger view that shows electronegativity values.)

Explanation:

3 0
3 years ago
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