CHEMISTRY COLLEGE

Blood samples for research or medical tests sometimes have heparin added. Why is this done? ​

Answers

Answer 1
Answer: It is essential for accurate results that the correct volume of blood is sampled to achieve a correct concentration (and dilution, if liquid heparin is used), and that blood and anticoagulant are well mixed immediately after sampling.

Related Questions

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The radius of an atom of gold (Au) is about 1.35 Å.How many gold atoms would have to be lined up to span 5.5 mm ?
What is the empirical formula of a compound composed of 36.7 g 36.7 g of potassium ( K K ) and 7.51 g 7.51 g of oxygen ( O O )? Insert subscripts as needed.
Why is predicting our future oil supply controversial and involves some uncertainty?I just need some explaining.

Nickel (II) ions form a complex ion in the presence of ammonia with a formation constant (Kf) of 2.0×10^8:Ni2+ + 6NH3 ⇌ [Ni(NH3)6]2+
Calculate the molar solubility of NiS in 3.1 M NH3. g

Answers

Answer:

The molar solubility of NiS is 7.7 * 10⁻⁷ M

Explanation:

To answer this question, we need to keep in mind two equilibriums.

First, we have the solubilization of NiS:

NiS ⇄ Ni²⁺ + S²⁻   ksp= 3.0 * 10⁻²¹  (we know this from standard tables)

Second, we have the formation of the complex:

Ni²⁺ + 6NH₃ ⇄ [Ni(NH₃)₆]²⁺   kf=2.0 * 10⁻⁸

Combine the two equilibriums and we have

NiS + 6NH₃ ⇄ [Ni(NH₃)₆]²⁺ + S²⁻  K= ksp * kf =6.0* 10⁻¹³=([S^(2-)][Ni(NH3)6^(+2)])/([NH3]^(6))

The molar solubility s is equal to both [Ni(NH₃)₆²⁺] and [S²]

At equilibrium, [NH₃]= 3,1 M - 6s

Thus, if we replace those terms in the formula for K, we're left with:

(s^(2) )/((3,1-6s)^(2))=6*10^(-13)

Using an approximation we can ignore the denominator and we have

  • s²=6.0 * 10⁻¹³
  • s=7.7 * 10⁻⁷

A balloon has a volume of 7.00 liters at a pressure of 740 mm Hg. If the temperature remains constant, at what pressure will the volume decrease to 2.00 liters?a. 749 mm Hg
b. 52.9 mm Hg
c. 211 mm Hg
d. 2590 mm Hg

Answers

Answer:

D

Explanation:

P1 x V1 = P2 x V2

7.00(740) = x(2.00)

2590 mm Hg

took me a while because i dont know this, hope its right good luck

What do lactate dehydrogenase, aspartate aminotransfcrase, and creatine kinase all have in common? a. they all are allosteric enzymes b. they are all zymogens c, they are all used to diagnose medical conditions d. they all function at abeornally high temperatures

Answers

Answer:

c. they are all used to diagnose medical conditions

Explanation:

Lactate dehydrogenase, aspartate aminotransfcrase, and creatine kinase all are used to diagnose medical conditions.

A chemical equation is balanced when thesubscripts of the reactants equal the subscripts of the products,
coefficients of the reactants equal the coefficients of the products,
products and reactants are the same chemicals,
same number of each kind of atom appears in the reactants and in the products,

Answers

same number of each kind of atom appears in the reactants and in the products

Be sure to answer all parts. (a) How many atoms are directly bonded to the central atom in a trigonal planar molecule?

i. two
ii. three
iii. six
iv. eight

(b) How many atoms are directly bonded to the central atom in a trigonal bipyramidal molecule?

i. three
ii. four
iii. five
iv. six

(c) How many atoms are directly bonded to the central atom in an octahedral molecule?

i. three
ii. four
iii. six
iv. eight

Answers

Answer:

a) ii

b)iii

c)iii

Explanation:

three atoms directly bonded then only it is possible to achieve trigonal planar

trigonal bipyramidal means five atoms should attach to central atom

for octahedral six atoms must directly connected to central atom

After clamping a barrette to a ring stand you noticed that the set up is tippy and unstable what should you do to stabilize the set up?

Answers

Move the buret clamp to a ring stand with a larger base.
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