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4 years ago

A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal

Chemistry

1 answer:

Roman55 [17]4 years ago

6 0

Answer:

$\large \boxed{\text{Metal 4}}$

Explanation:

$\text{Density} = \dfrac{m}{V} = \dfrac{\text{mass}}{\text{volume}}\\\\\begin{array}{cccc}\textbf{Metal}&\textbf{Mass/g} & \textbf{Volume/cm}^{3} & \textbf{Density/g$\cdot$cm}^{-3}\\1 & 22.1 & 3.00 & 7.36\\2 & 42.0 & 4.00 & 10.5\\3 & 9.32 & 5.00 & 1.86\\\mathbf{4} & 8.13 & 3.00 & \mathbf{2.71}\\\end{array}\\\text{The manufacturer selected $\large \boxed{\textbf{Metal 4}}$}$

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Before the use of technetium-99m, patients with high risk coronary artery disease were evaluated using thallium-201 which has a

agasfer [191]

Answer: 243 hours

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = initial amount of the reactant = $5.000\mu g$

a - x = amount left after decay process = $\frac{10}{100}\times 5.000\mu g=0.5\mu g$

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.693}{73.00hours}=9.49\times 10^{-3}hours^{-1}$

b) for reducing the mass to 10.00 % of its original mass

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

$t=\frac{2.303}{9.49\times 10^{-3}}\log\frac{5.000}{0.5}$

$t=243hours$

The time taken to reach 10.00 % of its original mass is 243 hours

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3 years ago

which moving body has no acceleration? a.a satilite orbiting at a constant speed b.a person rnning once around a track at a cons

RoseWind [281]

The answer is D. for sure i took the test no acceleration means no turning going straight no turns i hope i helped

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3 years ago

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A gas sample in a rigid container at 455 K is brought to STP (273K and 1 atm). What was the original pressure of the gas in mmHg

Molodets [167]

1) V(CH₄) = 0,376 L.T(CH₄) = 304 K.p(CH₄) = 1,5 atm 101325 Pa/atm = 151987,5 Pa = 151,9875 kPa.R = 8,314 J/K·mol.Use ideal gas law: p·V = n·R·T.n(CH₄) = p · V ÷ R · T.n(CH₄) = 151,9875 kPa · 0,376 L ÷ 8,314 J/K· mol · 304 K.n(CH₄) = 0,0226 mol.V(CH₄) = n(CH₄) · Vm.V(CH₄) = 0,0226 mol · 22,4 dm³/mol.V(CH₄) = 0,506 dm³ = 0,506 L.
2) V(SO₂) = 5,2 L.p(SO₂) = 45,2 atm = 45,2 atm · 101,325 kPa/atm = 4579,89 kPa.T(SO₂) = 293 K.R = 8,314 J/K·mol.Use ideal gas law: p·V = n·R·T.n(SO₂) = p · V ÷ R · T.n(SO₂) = 4579,89 kPa · 5,2 L ÷ 8,314 J/K· mol · 293 K.n(CH₄) = 9,77 mol.There is not enogh SO₂, 225 mol - 9,77 mol = 215,23 mol is needed.
3) p(He) = 3,50 atm · 101,325 kPa/atm = 354,63 kPa.V(He) = 4,00 L.n(He) = 0,410 mol.R = 8,314 J/K·mol.Use ideal gas law: p·V = n·R·T.T = p · V ÷ R · n.T(He) = 354,63 kPa · 4,00 L ÷ 8,314 J/K· mol · 0,410 mol.T(He) = 416,14 K.n - amount of substance.
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4 years ago

Why is matter measured in mass and not weight?

wel

Answer:

But why should it even <u>matter</u>?

Explanation:

Mass is a measurement of the amount of matter something contains, while Weight is the measurement of the pull of gravity on an object.

The Mass of an object doesn't change when an object's location changes. Weight, on the otherhand does change with location.

Hope this helps!!

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3 years ago

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What type of reactions will produce radiation?

snow_tiger [21]

Answer:

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Explanation:

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3 years ago