A chemist dissolves an unknown solute into 1000 grams of water and then measures the freezing point to be -2.88 C what can be determined from this data and from known constants for water?

Answers

Answer 1

Answer:

ANSWER ; The moles of solute particles in the solution

Answer 2

Answer: the known constant of water is that it freezes at 0 degrees Celsius and boils at 100 degrees Celsius. it can be determined that because of the solute added the water becomes a compound meaning it no longer has the constants of pure water hence the difference in freezing point

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Each enzyme functions in a different area of the body, but both work to harness the power in carbohydrates and break these complex molecules into simple sugars. Based on the information you have learned about the digestive system, what do you expect to be the optimal pH for the enzymatic action of pancreatic amylase?

Answers

The optimal pH is 6.9. The pancreatic amylase is a hydrolase secreted by the pancreas and will go into the alimentary canal. The working environment has a pH of 6.9. So the optimal pH for the enzyme needs to be 6.9.

Explanation:

The optimum pH scale for the catalyst activity of secretion enzyme ranges from half-dozen to seven. higher than and below this vary, the reaction rate reduces as enzymes get denaturated. The accelerator secretion enzyme is most active at pH scale 6.8.
Human duct gland alpha-amylase. II. Effects of hydrogen ion concentration, substrate and ions on the activity of the protein. refined human duct gland alpha-amylase (alpha-1,4-glucan 4-glucanohydrolase, EC 3.2.1.1) was found to be stable over a large vary of hydrogen ion concentration values (5.0 to 10.5.

The optimal pH is 6.9. The pancreatic amylase is a hydrolase secreted by pancreas and will go into the alimentary canal. The working environment has a pH of 6.9. So the optimal pH for the enzyme needs to be 6.9.

What are four physical properties of aluminum foil?

Answers

1) solid
2) ductile
3) malleable
4) silver in color

Malleable means that it is "flexible" or can be permanently reshaped easily. Ductile means that it can be drawn out into a wire. Aluminum foil's state of matter is solid, and it appears in a silver color.

Solid

Shiny

Dole

Conductor if electricity

The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.0°C, assuming none of the heat is lost to the surroundings?

Answers

The heat of combustion ( $\Delta$ Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions.

3.05988g. grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.0°C.

What is meant by heat of combustion?

The heat of combustion ( $\Delta$ Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions. In most cases, a hydrocarbon reacts with oxygen to produce carbon dioxide, water, and heat.
The heat of combustion of a substance is the amount of energy released when a specific amount (e.g., 1 mol, 1g, 1 L) of the substance completely burns in oxygen. The heat of combustion is typically measured at 298K (25 C) and 101.3kPa.
The energy released when a substance X completely burns with an excess of oxygen under standard conditions (25°C and 1 bar). It is the inverse of the enthalpy change for the combustion reaction in thermodynamic terms.

q=m*c*(change of T)

q=10000g(0.385J/g*c)*(65.0C-25.0C)or (338.2 K-298.2K)

q=154000J

154000J*(1 mol/2220 KJ)=69.36936 x $10 ^-3$ mol

here's where I'm stuck

0.069369 mol

and i know that for every 1 mol there is 44.11g of C3H8.

0.069369 mol* (44.11g C3H8)/1mol = 3.05988g.

To learn more about : Heat of combustion

Ref : brainly.com/question/25109613

#SPJ2

Answer:

Explanation:

q = (mass) (temp change) (specific heat)

q = (10000 g) (40 °C) (0.385 J/g⋅°C) = 154000 J = 154 kJ

154 kJ / 2220 kJ/mol = 0.069369369 mol

0.069369369 mol times 44.0962 g/mol = 3.06 g (to three sig figs)

answer choice 4

An inherited behavior that helps an animal meet its needs

Answers

Answer:

the answer is adaptations

Explanation:

A body part or behavior that helps an animal meet its need in its environment is called an adaptation. All adaptions are inherited traits. Camouflage is an animal's color or pattern that help it blend in with its surroundings.

Which layer of the suns atmosphere appears red during an eclipse

Answers

The part of the Sun that we see during eclipse is the photosphere. The photosphere is scattered by the loose electrons in the corona’s plasma. A total solar eclipse is when the Moon appears to cover the entire solar disc. It lasts no more than 8 minutes.

When molecules are joined I an ordered structure

Answers

Answer:

ice

Explanation:

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A food product claiming to be sugar free containsA. less than 10 grams of sugar per serving. B. less than 0.5 grams of sugar per serving. C. less than 5 milligrams of sugar per serving. D. less than 2 milligrams of sugar per serving.