CHEMISTRY MIDDLE SCHOOL

Steve puts some cheddar cheese in a pan on the stove and starts to melt it. After a little while, there is a layer of oil floating on top of the cheese. From the way the cheese melted, Steve knows it is aA Element
B Solid
C Mixture
D Pure Substance.

Answers

Answer 1

Answer:

From the way the cheese melted, Steve knows that Cheese is a mixture.

Thus, option C is correct.

What is a mixture?

Mixtures are composed of two or more different substances that have not been chemically combined.

The following is a list of mixture’s properties:

Each of the components in a mixture retains its unique features.

Component separation is simple to carry out.

The components' relative proportions vary.

A physical combination of two or more pure chemicals that maintains each substance's unique chemical identity is referred to as a mixture.

A single type of matter, known as a pure substance, cannot be physically separated into other types of matter.

Mixtures are not pure substances, but elements and compounds are. The elements that make up a compound are substantially distinct from one another.

Hence, cheese is a mixture since it’s components can be easily separated and are not chemically combined.

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Answer 2

Answer: The answer is C. Mixture

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Help me plsssssssss Brainliest to correct answer

A chemistry student needs 50.0 g of dimethyl sulfoxide for an experiment. By consulting the CRC handbook of chemistry and physics, the student discovers that the density of dimethyl sulfoxide is 1.10 g×10^-3. Calculate the volume of dimethyl sulfoxide the student should pour out

Answers

Answer:

45.45 ml of dimethyl sulfoxide

Explanation:

density of dimethyl sulfoxide is 1.10 g/10⁻³L which is 1.10 g/mL

now we devise the next reasoning:

If 1.10 g of dimethyl sulfoxide have a volume of 1 mL

Then 50 g of dimethyl sulfoxide have a volume of X mL

X = (50 × 1) / 1.10 = 45.45 ml of dimethyl sulfoxide

Final answer:

To calculate the volume of dimethyl sulfoxide needed, you must divide the mass by the density. With the given values, the resulting volume is approximately 45.45 L.

Explanation:

The subject of this question relates to the concept of density, which is directly related to mass and volume. We can apply the formula Density = Mass / Volume, hence Volume = Mass / Density. The mass provided in the question is 50.0 g and the density of dimethyl sulfoxide is given as 1.10 g×10^-3. Plugging in these values into the Volume equation gives us Volume = 50.0 g / 1.10 g×10^-3, which equals ~45,454.55 mL or approximately 45.45 L.

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Which state of matter has the least amount of energy?

Answers

Solid has the least amount of energy.

This is so because liquid is free to move and can fit in any shape.
Gas floats and is usually always free to move.

Solid isn't free to move unless some force moves it.

Matter has the least energy as a solid

A container of hydrogen at 172 kpa was decreased to 85.0 kpa producing a new volume of 765 mL. What was the original volume

Answers

Answer:

$\boxed{\text{378 mL}}$

Explanation:

The temperature and amount of gas are constant, so we can use Boyle’s Law.

$p_(1)V_(1) = p_(2)V_(2)$

Data:

$\begin{array}{rclrcl}p_(1)& =& \text{172 kPa}\qquad & V_(1) &= & \text{?} \np_(2)& =& \text{85.0 kPa}\qquad & V_(2) &= & \text{765 mL}\n\end{array}$

Calculations:

$\begin{array}{rcl}172V_(1) & =& 85.0 * 765\n172V_(1) & = & 65 025\nV_(1) & = &\textbf{378 mL}\n\end{array}\n\text{The original volume was } \boxed{\textbf{378 mL}}$

Please help!!!! A group of students is studying convection currents. They fill two identical balloons with the same amount of helium. One balloon is placed in a freezer and the other in an area with warm air. After 10 minutes, the balloons are released from a height of 1 meter. Which of the following do the students most likely observe? A. The balloons both rise. The cold balloon is larger than the warm balloon.

B. The balloons rise at the same rate. Both balloons are the same size.

C. The warm balloon expands and rises. The cold balloon shrinks and sinks.

D. The cold balloon expands and rises. The warm balloon shrinks and sinks.

Answers

The correct answer is option C, that is, the warm balloon expands and rises, and the cold balloon shrinks and sinks.

It is known from the ideal gas equation, that PV = nRT

Here, P is pressure, V is volume, n is the number of atoms in gas, R is gas constant, and T is temperature.

From the equation, it is clear that the volume of balloon is directly proportional to the temperature. It signifies that at constant pressure when temperature elevates than at that time volume of the balloon will increase and when temperature reduces the volume of balloon will decrease.

Thus, the volume of warm balloon will increase because of which its density increases and it can rises easily as a less dense substance can easily rises in air in comparison to more dense gas or substance. Thus, the cold balloon shrinks and sinks.

PLEASE PLEASE HELP WITH THESE QUESTIONS PLEASE!!!!!!!!Is this statement true or false?

Living things are classified by the characteristics they have in common.
______________________________________________________________________________
There are seven major levels of classification. Kingdom and Phylum are just two of the levels. Which of the following are also major levels of classification?

Choose all answers that are correct.

A.
Class

B.
Order

C.
Family

D.
Level
______________________________________________________________________________
Which of the following are also major levels of classification?

Choose all answers that are correct.

A.
Genus

B.
Species

C.
Group
HELP

Answers

I learned this in grade 7 and we had to study an animal . The most important is genus, species, order, and family. I believe this is the answer but I am not 100% sure. Good Luck :D

Really all are important, but this should help.It goes,DOMAINKINGDOMPHYLUMCLASSORDERFAMILYGENUSSPECIESA good way to remember this is by thinking,DidKingPhilipCameOverForGoodSpeghettiHope this helps.

Why do you need a reference point to know if an object is moving