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3 years ago

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HELP QUICK ILL GIVE YOU BRAINLIEST AND 25 POINTS! bromine (br) has four energy levels. name 2 other elements that would have fou

r energy levels.

2 answers:

Temka [501]3 years ago

6 0

Answer:

titanium and potassium

Explanation:

Ipatiy [6.2K]3 years ago

3 0

Answer: geranium and krypton

Explanation: hope this helps

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A 3.0 L sample of helium gas is stored in a rigid, sealed container at 25 °C and

diamong [38]

Answer:

C. 2.9 atm

Explanation:

- Use combined gas law formula and rearrange it.

- Convert C to K.

- Hope that helped! Please let me know if you need a further explanation.

5 0

3 years ago

An 8.42 g piece of metal with a specific heat of 1.020 J g-1 k-1 wasn't heated to an unknown temperature. The metal was then pla

ANTONII [103]

Answer:

$T = 61.344\,^{\textdegree}C$

Explanation:

The heat received by water is equal to the heat rejected by the piece of metal. That is to say:

$-Q_{piece} = Q_{water}$

$(8.42\,g) \cdot \left(1.020\,\frac{J}{g\cdot ^{\textdegree}C} \right) \cdot (T - 20.40\,^{\textdegree}C)= (44.2\,g)\cdot \left(4.187\,\frac{J}{g\cdot ^{\textdegree}C} \right)\cdot (20.40\,^{\textdegree}C-18.50\,^{\textdegree}C)$

$\left(8.588\,\frac{J}{^{\textdegree}C} \right)\cdot (T-20.40\,^{\textdegree}C) = 351.624\,J$

The initial temperature of the piece of metal is:

$T = 61.344\,^{\textdegree}C$

4 0

3 years ago

Read 2 more answers

12 = 3X X = <br> 7X = 57 X = <br> 11X = 27.7 X =

dybincka [34]

Answer:
1. $x=4$
2. $x=\frac{57}{7}$
3. $x=\frac{27.7}{11}$

Explanation:

Given the following questions:

$12=3x$
$7x=57$
$11x=27.7$

In order to find the answers to these questions, we have to recognize that in order to isolate the variable we need to divide on both sides.

Question one:
$12=3x$
$\frac{3x}{3} =\div3$
$12\div3=4$
$x=4$

Question two:
$7x=57$
$\frac{7x}{7} =\div7$
$57\div7=8.14285714=\frac{57}{7}$
$x=\frac{57}{7}$

Question three:
$11x=27.7$
$\frac{11x}{11} \div11$
$27.7\div11=2.51818182=\frac{27.7}{11}$
$x=\frac{27.7}{11}$

Hope this helps.

3 0

2 years ago

Naturally occurring hydrogen consists of three isotopes, hydrogen-1 (1.01 u),

Vlada [557]

Answer:

Hydrogen-1

Explanation:

Not sure what kind of explanation is needed for your question, because it doesnt specify.

The easiest should be:

Average mass of an element is calculated as the sum of the multiplication of each isotope by its percentage

And the mass of the hydrogen is 1, therefore the more abundant is hydrogen-1

3 0

3 years ago

Read 2 more answers

Naturally occurring copper is 69.15% copper-63 (atomic mass = 62.93 amu) and 30.85% of some other isotopic form of copper. what

agasfer [191]

<span>64.94 First, write out an expression about what we know 0.6915 * 62.93 + 0.3085 * x = 63.55 Now solve for x 0.6915 * 62.93 + 0.3085 * x = 63.55 43.5161 + 0.3085 * x = 63.55 0.3085 * x = 20.03391 x = 64.93972 Rounding the answer to 2 decimal places gives x = 64.94</span>

6 0

3 years ago