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3 years ago

What contribution did Jonas Salk make to science in the 1950s?

Biology

2 answers:

victus00 [196]3 years ago

8 0

He basically made the first safe and effective vaccine for the disease Polio

Sergio039 [100]3 years ago

4 0

Jonas Salk made the Polio vaccine.

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Does the bone marrow of all bones produce immune cells?.

Ann [662]

Answer:

Yes

Bone marrow is the spongy tissue inside bones that produces blood cells. Bone marrow produces red blood cells, platelets, and white blood cells. Lymphocytes are produced in the marrow, and play an important part in the body's immune system.

Explanation:

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2 years ago

What life process removes wastes

densk [106]

"Excretory Process" is the process which removes wastes

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3 years ago

What is one potential benefit and one potential negative impact of genetically engineering crops?

strojnjashka [21]

Answer:

potential benefit: more nutritious food

potential negative impact:biodiversity loss

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2 years ago

Imagine a patient came into your medical practice. What are symptoms that, collectively, would indicate a possible respiratory p

o-na [289]

Answer: 1. Cancer 2. Blood virus 3. heart problems

Explanation:

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3 years ago

If you wanted to combine equal numbers of Na and Cl atoms in a flask, how much Cl would you have to add if you added 23g of NA?

Gwar [14]

Answer: The mass of chlorine atom required to combine is 35.5 grams.

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For sodium:

Given mass of sodium = 23 g

Molar mass of sodium = 23 g/mol

Putting values in equation 1, we get:

$\text{Moles of sodium}=\frac{23g}{23g/mol}=1mol$

According to mole concept:

1 mole of an atom contains $6.022\times 10^{23}$ number of particles

So, 1 mole of sodium will contain = $(1\times 6.022\times 10^{23})=6.022\times 10^{23}$ number of atoms

Number of atoms of chlorine = Number of atoms of sodium = $6.022\times 10^{23}$ = 1 mole

Now, calculating the mass of chlorine required by using equation 1:

Moles of chlorine = 1 mole

Molar mass of chlorine = 35.5 g/mol

Putting values in equation 1, we get:

$1mol=\frac{\text{Mass of chlorine}}{35.5g/mol}\\\\\text{Mass of chlorine}=(1mol\times 35.5g/mol)=35.5g$

Hence, the mass of chlorine atom required to combine is 35.5 grams.

5 0

3 years ago