After being thoroughly stirred at 10.°C, which mixture is heterogenous?(1) 25.0 g of KCl and 100. g of H2O(2) 25.0 g of KNO3 and 100. g of H2O
(3) 25.0 g of NaCl and 100. g of H2O
(4) 25.0 g of NaNO3 and 100. g of H2O

Answers

Answer 1

Answer: The answer is (2) KNO3. This depends on the solubility of these four compounds at 10℃. For NaCl, it is 35.8 g, For NaNO3, 80.8 g. KCl, 31.2 g. KNO3, 21.9g. So only KNO3 is less than 25.0 g.

Answer 2

Answer:

Answer:

Explanation:

Because if look at the Solubity curves you will notice other three doesn't go 25 grams. They start above the 25 grams.

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Enzymes are proteins that speed up chemical reactions in the body how do they workA. they increase the surface area of reactants
B.they increase the concentration of reactants
C.they decrease the concentration of products
D. They act as reactants

Answers

The answer would be D, Enzymes are soluble protein molecules that can speed up chemical reactions in cells. These reactions include respiration, photosynthesis and making new proteins. For this reason enzymes are sometimes called biological catalysts.

Answer:

D) They act as reactants

Explanation:

I took the test.

Hope this helps!!

An isotope undergoes radioactive decay. The new isotope that forms has an atomic number that is 2 less than the original isotope’s. Which kind of decay has occurred, and how do you know?
alpha decay because alpha particles have a large mass
beta decay because beta particles can have negative charge
alpha decay because alpha particles have two protons and two neutrons
gamma decay because gamma rays are photons

Answers

The answer is alpha decay, because alpha particles have two protons and two neutrons. If the isotope has an atomic number two less than the original, it lost two protons, the same amount as in an alpha particle.

The kind of decay which has occurred is: C. alpha decay because alpha particles have two protons and two neutrons.

What is an alpha decay?

An alpha decay refers to a type of radioactive decay in which the atomic nucleus of a radioactive element emits an alpha particle (two protons and two neutrons), thereby, producing chemical elements with a different atomic nucleus.

Basically, this isotope has a mass number that is decreased by four (4) and an atomic number (protons) that is decreased by two (2), which is an atom of Helium (He).

Read more on alpha decay here: brainly.com/question/23303931

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Properties of a solution that depend only on the ratio of the number of particles of solute and solvent in the solution are known as:intensive properties

extensive properties

colligative properties

chemical properties

Answers

Properties of a solution that depend only on the ratio of the number of particles of solute and solvent in the solution are known as colligative properties

A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?

Answers

Number of moles:

mass of solute / molar mass

78.6 / 60.1 = 1.3078 moles

hope this helps!

26 PONITS FOR BEST ANSWER28

Which of the following is not related to the First Law of Motion?

An object in motion stays in motion unless acted on by an outside force.
An object at rest will stay at rest.
An object must overcome inertia to begin moving.
Having a heavier mass may increase the force of a moving object.

29

Which of the following is not an example of friction?

Pouring water off a bridge and watching it turn to small drops by the time it hits the ground.
A wrecking ball swinging towards its target.
A piece of ice dropping into a glass of water that sinks more slowly than it fell through the air.
Smoothing an ice rink with a Zamboni.

30

What three quantities are involved with the Second Law of Motion?

acceleration, gravity, inertia
acceleration, inertia, force
mass, gravity, acceleration
acceleration, force, mass

31

Why do phytoplanktons have projections and form long chains?

To catch more food
To respire oxygen more efficiently
To keep from sinking and capture more light
To evade predators

32

If an object's acceleration is zero, which of these could be true?

it is slowing down
it is stopped
it is not changing its speed
Both B and C could be true