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3 years ago

CAN SOMEONE HELP ME PLEASE!!!!! blank carry blood away from the heart, while blank carry blood back to the heart.

Chemistry

2 answers:

Verizon [17]3 years ago

4 0

Answer:

Blood Vessels (C)

Explanation:

The circulatory system is made up of blood vessels that carry blood away from and towards the heart.

Blank Number 1 is Arteries and Blank Number 2 is Veins

Serhud [2]3 years ago

3 0

Answer:

arteries

Explanation:

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What volume (in mLmL) of a 0.175 MHNO3MHNO3 solution is required to completely react with 44.2 mLmL of a 0.108 MNa2CO3MNa2CO3 so

r-ruslan [8.4K]

Answer:

54.5 mL

Explanation:

Let's consider the following balanced equation.

Na₂CO₃(aq) + 2 HNO₃(aq) → 2 NaNO₃(aq) + CO₂(g) + H₂O(l)

44.2 mL of 0.108 M Na₂CO₃ solution react. The moles of Na₂CO₃ that react are:

0.0442 L × 0.108 mol/L = 4.77 × 10⁻³ mol

The molar ratio of Na₂CO₃ to HNO₃ is 1:2. The moles of HNO₃ that reacted are 2/1 × 4.77 × 10⁻³ mol = 9.54 × 10⁻³ mol

9.54 × 10⁻³ moles of HNO₃ are in a 0.175 M solution. The required volume of HNO₃ is:

9.54 × 10⁻³ mol × (1 L/0.175 mol) × (1000 mL/1 L) = 54.5 mL

6 0

4 years ago

For the reaction:

Rom4ik [11]

Answer:

Half-life at 310 K is 6.54 × 10³ s.

Explanation:

Let's consider the following reaction:

2 N₂O₅(g) → 4 NO₂(g) + O₂(g)

The rate law is:

(Δ[O₂]/Δt) = k . [N₂O₅]

Since [N₂O₅] is raised to the power of 1, the reaction order is 1.

For a first-order reaction:

$t_{1/2}=\frac{ln2}{k}$

where,

$t_{1/2}$ is the half-life

$k$ is the rate constant

At 300 K,

$(t_{1/2})_{1}=\frac{ln2}{k_{1}}\\k_{1}=\frac{ln2}{(t_{1/2})_{1}} =\frac{ln2}{2.50 \times 10^{4} s} =2.77 \times 10^{-5} s^{-1}$

We can use two-point Arrhenius equation to solve for k₂ at 310 K

$ln\frac{k_{2}}{k_{1}} =\frac{-Ea}{R} (\frac{1}{T_{2}} -\frac{1}{T_{1}} )\\ln\frac{k_{2}}{k_{1}} =\frac{-103.3kJ/mol}{8.314 \times 10^{-3} kJ/mol.K} .(\frac{1}{310K}-\frac{1}{300K} )\\ln\frac{k_{2}}{k_{1}}=1.34\\k_{2}=1.06 \times 10^{-4} s^{-1}$

At 310 K,

$(t_{1/2})_{2}=\frac{ln2}{k_{2}}=\frac{ln2}{1.06 \times 10^{-4} s^{-1} } =6.54 \times 10^{3} s$

4 0

3 years ago

Balance the following equation. Choose "blank" if no coefficient other than 1 is needed.

Ann [662]

Explanation:

Pb+2 AgNO3=Pb(NO3)2+2Ag

8 0

3 years ago

Read 2 more answers

Part A

sertanlavr [38]

Volume HNO₃ : 51.4 ml

Mass CO₂ : 0.17 g

<h3>Further explanation</h3>

Reaction

Na₂CO₃ + 2 HNO₃ ⇒ 2 NaNO₃ + CO₂ + H₂O

V Na₂CO₃ = 35.7 ml

M Na₂CO₃ = 0.108

mol Na₂CO₃ :

$\tt 35.7\times 0.108=3.8556~mlmol$

mol ratio Na₂CO₃ : HNO₃ = 1 : 2

mol HNO₃ :

$\tt \dfrac{2}{1}\times 3.8556=7.71~mlmol$

Volume HNO₃ :

$\tt mol=n=M\times V\\\\V=\dfrac{n}{M}=\dfrac{7.71}{0.15}=51.4~ml$

mol CO₂ = mol Na₂CO₃ = 3.8556 mlmol=0.00386 mol

mass CO₂(MW=44 g/mol) :

$\tt 0.00386\times 44=0.17~g$

5 0

3 years ago

What is the Difference between Research and Investigation???

Usimov [2.4K]

<span>Research is a human activity based on intellectual investigation and is aimed at discovering, interpreting, and revising human knowledge on different aspects of the world. Research can use the scientific method, but need not do so.

</span><span>Investigation is the process of inquiring into a matter through research, follow-up, study, or formal procedure of discovery.</span>

7 0

3 years ago

CAN SOMEONE HELP ME PLEASE!!!!! *blank* carry blood away from the heart, while *blank* carry blood back to the heart.

CAN SOMEONE HELP ME PLEASE!!!!! blank carry blood away from the heart, while blank carry blood back to the heart.