PLEASE APEZ HELP I DONT UNDERSTAND
A teacher placed a plastic cup of warm coffee with a lid in the freezer.
Which statement describes the frozen coffee in comparison with the warm
coffee?
A. The amount of coffee is the same.
B. The speed of the coffee molecules has increased.
C. The temperature of the coffee has increased.
D. The arrangement of the coffee molecules is the same.

Answers

Answer 1

Answer: The answer is A

Explanation:.


Related Questions


Convert the following to Kelvin
12) 0° C
13) -50° C
14) 90° C
15) -20° C

Answers

Answer:

12)273.15 kelvin

13)223.15 kelvin

14)363.15 kelvin

15)253.15 kelvin

Explanation:

thank u!!!

Answer:

12) 273.15

13) 223.15

14) 363.15

15) 253.15

Explanation:

Formula:

_C+273.15=_K

The most important ELEMENT found in all living things is


A. Oxygen

B. hydrogen

C. Nitrogen

D. Carbon

Answers

Answer:

A. Carbon hope this helps

Answer:

D. Carbon. I guess that's the answer


Why can astronauts jump so high, and "hang" so
long, on the moon?

Answers

gravity is stronger on the earth, and gravity is what brings you back down

so, if there's less gravity, then there's more air time

Answer:

Low gravity

Explanation:

The moon has lower gravity than Earth, therefor when someone jumps, they will not return to the surface automatically.

A train travels at an average speed of 25 miles per hour. How long does it take the train to travel 2000 miles?

Answers

nevermind. I was wrong. I didn't see the other answers

What kind of reaction happens when two compounds switch elements? Apex

Answers

Answer:

A replacement reaction occurs when elements switch places in compounds. This type of reaction involves ions. Generally, more reactive elements replace less reactive elements. A single replacement reaction occurs when one element replaces another element in one compound.

Explanation:

Just figured it out!

Answer: a double - replacement reaction

Explanation:

I just got it right on Apex

What are some of the regulations about cell phone waste?


Are the regulations the same everywhere, which countries have different regulations?


New technology to reduce waste?


Pls and thank you!

Answers

What are some of the regulations about cell phone waste?

In general, companies take part in the responsibility of taking back the e-waste resulted from their products.

Are the regulations the same everywhere, which countries have different regulations?

In 2005, two important directives were published in the European Union. The first stipulates that: 1) all manufacturers selling electrical and electronic equipment in and to EU countries label the equipment to inform customers that it must be recycled and 2) make sure that their products are properly disposed of or recycled after the life cycle. The second requires manufacturers to eliminate or minimize the use of lead, mercury, hexavalent chromium, cadmium, polychrome and diphelin biphenyl ethers in electrical and electronic equipment sold in the EU after 1 July 2006.

New technology to reduce waste?

Companies are trying to reduce the amount of resources needed in order to create their products. One alternative is the modular smarthphones, which aims to reduce the amount of e-waste of the phone by only upgrading a few elements of hardware.

How many fluorine atoms are present in 6.30 g of C2F4

Answers

Fluorine atoms = 1.517 x 10²³

Further explanation

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

[tex]\large{\boxed{\boxed{\bold{mol=\frac{mass}{molar\:mass}}}}[/tex]

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

Mass of F

[tex]\tt mass~F=\dfrac{4.Ar~F}{MW~C_2F_4}\times mass~C_2F_4\\\\mass~F=\dfrac{4.19}{100}\times 6.3=4.788~gr[/tex]

mol of F

[tex]\tt =\dfrac{4.788}{19}=0.252[/tex]

number of Fluorine atoms

[tex]\tt 0.252\times 6.02\times 10^{23}=1.517\times 10^{23}[/tex]

which of the following lists contains only elements?
A ) air , water,oxygen
b) hydrogen, oxygen, brass
c) air , fire , water, earth
d) calcium, sulphur, carbon

Answers

C. air, fire, water, earth. 4 elements

The atomic mass of an atom is calculated by adding up what two subatomic particles

Answers

The atomic mass of an atom is calculated by adding up protons and neutrons

Further explanation

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): protons, electrons, and neutrons

The charge of 1 proton is equal to a charge of 1 electron but has a different sign

The proton is positively charged (+1), the electron is negatively charged (-1). and neutrons not charged (neutral)

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

I NEED HELP ASAP!!
Scientific Inquiry

Science is the investigation of the ______________ ________________. Biology is the branch of science that studies ___________ _______________ and the environments they live in.

The Scientific Method

The scientific method is a __________________ used during a scientific ____________________ to answer a scientific question.
• Qualitative data is something that can’t be
________________ but can change over time.
Scientific inquiry can’t answer questions about a person’s beliefs, ethics, _________________, and feelings.

Which of these are questions that science can answer?

A. Was the flu vaccine more effective this year than last year?
B. Is it ethical to use stem cells in human research?
C. Does a drop in temperature affect the number of offspring that frogs produce?
D. Will people feel better if they eat organic produce instead of conventionally grown produce?
E. Are coffee drinkers worried about their heart disease risk?

Construct Hypotheses and Predictions
A hypothesis is a plausible __________________ for a particular fact. The hypothesis needs to be ____________________ or ____________________ based on collected evidence. All studies must have at least one hypothesis.

Answers

Answer:

Science is the investigation of the ______________ ________________. Biology is the branch of science that studies living organisms and the environments they live in.

The scientific method is a tool used during a scientific investigation to answer a scientific question.

• Qualitative data is something that can’t be

collected but can change over time.

Scientific inquiry can’t answer questions about a person’s beliefs, ethics, values, and feelings.

im going to say d

Construct Hypotheses and Predictions

A hypothesis is a plausible guess for a particular fact. The hypothesis needs to be supported or refuted (proven wrong) based on collected evidence. All studies must have at least one hypothesis.

Where in equation for photosynthesis does carbon dioxide belong

Answers

Answer:

The equation for photosynthesis is 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2, so carbon dioxide will be found in the reactant part of the equation.

During a scientific investigation, which step will a scientist perform first?

Answers

Answer:

you need to have a question or a problem first

A student dissolved a 0.139g sample of oxalic acid, H2C2O4, in water in an Erlenmeyer flask. Then the student titrated the H2C2O4 solution in the flask with a solution of KMnO4, which has a dark purple color. The balanced chemical equation for the reaction that occurred during the titration is shown above. (a) Identify the species that was reduced in the titration reaction. Justify your answer in terms of oxidation numbers.

Answers

Answer:

MnO4 − was reduced

C2 O4^2- was oxidized

Explanation:

2MnO4 −(aq)  +5H +(aq)  +2 C2 O4^2-(aq)  +6H+(aq)  →2Mn2+(aq) + 10CO2(g)  +8H2 O(l)

A redox reaction is characterized by a change in the oxidation number of reacting species from left to right in the reaction equation.

If we look at Manganese, its oxidation number was decreased from +7 on the left hand side to +2 on the right hand side. This implies that it gained five electrons. recall that reduction refers to electron gain.

If we look at carbon, its oxidation number increased from +3 on the left hand side to +4 on the right hand side. This indicates loss of one electron and oxidation refers to electron loss.

MnO₄⁻ was reduced and C₂O₄²⁻ was oxidized in the titration.

The balanced chemical equation for the reaction can be expressed as:

[tex]\mathbf{6H^+_{(aq0} + 2MnO_4^-_{(aq)} + 5H_2C_2O_4 _{(aq)} \to 10CO_{2(g)} +8H_2O_{(l)} + 2Mn^{2+}_{(aq)}}[/tex]

A redox reaction can be described by a variation in the oxidation number of reacting species in the chemical reaction equation from the reactant side to the product side

Oxidation takes place when a substance(atom, molecule, or compound) loses an electronReduction occurs when a substance gains an electron.

Let consider Mn in MnO₄⁻, its oxidation number was decreased from +7 on the reactant side to +2 on the product side. This shows a gain of additional five electrons.

Thus, MnO₄⁻ is reduced.

Also in C₂O₄²⁻, the oxidation number of carbon increases from +3 on the reactant side to +4 on the product side. Since an electron is lost, then oxidation  occurs at C₂O₄²⁻  

Learn more about oxidation and reduction here:

https://brainly.com/question/13699873?referrer=searchResults

Which chemical equation best represents the Law of Conservation of
Mass?
O H+ 0 -> H20
H2 + 02 --> H20
2H2 + O2 --> 2H20
H2 + O2 --> 2H,02

Answers

2H₂ + O₂ ⇒ 2H₂O

Further explanation

Conservation of mass states that

In a closed system, the masses before and after the reaction are the same

So it can be concluded

mass of the reactants = mass of the productsmass cannot be created or destroyedThe number of atoms involved in a reaction remains the same⇒ number of moles also the samechemical equation in balanced form

So let's see which of the several options , which one has the same number of atoms on both sides of the equation

2H₂ + O₂ ⇒ 2H₂O

H ⇒ left 4, right 4

O ⇒ left 2, right 2

so the equation is in balance and represents the Law of Conservation of

Mass

Why don’t all salts make a one-to-one ratio?

Answers

Answer:

because all types of salts are made up of different substrances

All salts do not make a one-to-one ratio because the salts are composed of different ions that combine together in different ratios.

A salt is an ionic substance. Salts are formed by combination of a cation and and anion.

Different salts are comprised of different ions. The ratios in which the ions combine in each salt is not the same.

Hence, all salts do not make a one-to-one ratio because the salts are composed of different ions that combine together in different ratios.

Learn more: https://brainly.com/question/5110211

Which of the following is NOT an example of a homogeneous mixture? a oxygen b tea c water d pizza

Answers

pizza because the ingredients arent mixed together completely. you can clearly see the different ingredients as compared to the others

HELP PLEASE!!!
chemistry question

Answers

Answer:

Its going to be D) In sigma bonds the electrons are in the space between the joined atoms and pi bonds above and below the joined atoms

The answer is D
The electrons are in the space above and below the joined atoms.

Explain the term rate of a chemical reaction.

Answers

Answer:

The rate of a reaction is a measure of how quickly a reactant is used up, or a product is formed.

Explanation:

Which type of fault is under compression? A. Normal. B. Thrust. C. Transform. D. Strike-slip

Answers

Answer:

The answer is Thrust

The solution starts with increased ________________

Answers

Answer:

Concentration

Explanation:

Answer:

concintracion

Explanation:

Which of the following electromagnetic waves has the most energy on the electromagnetic spectrum?
O A Infrared
O B. X-ray
O C. Gamma
O D. Radio

Answers

Answer:

Gamma rays

Explanation:

The waves with higher frequencies will have higher energies and gamma waves have the highest frequencies on electromagnetic scale ,because of this reason gamma waves is the answer.

Which statement best explains how the passage fits
the realistic fiction genre?​

Answers

Answer:

It seems believable and familiar.

Explanation:

Plz mark Brainlest

What is the importance of protons ?

Answers

Protons are important because they help keep the nucleus together, they also attract negatively charged electrons and keep them in orbit around the nucleus.

The protons inside a atoms nucleus help to bind the nucleus together. They attract the negative charged electrons and keep them in orbit around the nucleus. The number of protons in an atoms nucleus determine which chemical element it is

i need help ' please

Answers

Answer:

s orbitals - spherical shape

p orbitals - dumbbell shape

d orbitals- dxy, dyz , dzx -double dumbbell

- dx²-y²- double dumbbell (along axis)

-dz² -dumbbell with electron cloud

( along the axis)

therefore here the answer is 2s and 3s

i need help Which of the following shows the correct order in which organs take part in the process of digestion

Answers

Answer:

Mouth

Esophagus

Stomach

The small intestine

Colon (large intestine)

Rectum

The nucleus is held closely together by?

Answers

The nucleus of an atom is held together by the strong nuclear force to hold together protons and neutrons. The strong nuclear force is stronger than electricity and gravity. It's even the strongest out of the four fundamental forces.

Radioactive isotope X has a half-life of 500,000 years. This isotope may be found in some types of volcanic rocks. A particular sample of volcanic rock taken from a layer that covered up some of the earliest known human-like footprints contains 0.125 mg of isotope X. The volcanic rock sample originally contained 8.00 mg of isotope X. How long ago were these footprints made. I need the equation. Thanks. please I am stuck on this question. PLEASE

Answers

Answer:

The age of the earliest known human-like footprints is approximately 3000000 years.

Explanation:

Decay of isotopes is represented by the following ordinary differential equation:

[tex]\frac{dm}{dt} = -\frac{m}{\tau}[/tex] (Eq. 1)

Where:

[tex]\frac{dm}{dt}[/tex] - First derivative of mass with respect to time, measured in miligrams per year.

[tex]m[/tex] - Current mass of the isotope, measured in miligrams.

[tex]\tau[/tex] - Time constant, measured in years.

Now we proceed to obtain the solution of the differential equation:

[tex]\int\limits {\frac{dm}{m} } = -\frac{1}{\tau}\int dt[/tex]

[tex]\ln m = -\frac{t}{\tau}+C[/tex]

[tex]m(t) = e^{-\frac{t}{\tau}+C }[/tex]

[tex]m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }[/tex] (Eq. 2)

Where:

[tex]m_{o}[/tex] - Initial mass of the isotope, measured in miligrams.

[tex]t[/tex] - Time, measured in years.

[tex]\tau[/tex] - Time constant, measured in years.

We proceed to clear time within the formula presented above:

[tex]\ln \frac{m(t)}{m_{o}} = -\frac{t}{\tau}[/tex]

[tex]t = -\tau \cdot \ln \frac{m(t)}{m_{o}}[/tex]

In addition, time constant can be found as a function of half-life:

[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (Eq. 3)

If we know that [tex]t_{1/2} = 500000\,yr[/tex], [tex]m_{o} = 8\,mg[/tex] and [tex]m(t) = 0.125\,mg[/tex], the age of the earliest known human-like footprints is:

[tex]\tau = \frac{500000\,yr}{\ln 2}[/tex]

[tex]\tau \approx 721347.520\,yr[/tex]

[tex]t = -(721347.520\,yr)\cdot \ln \left(\frac{0.125\,mg}{8\,mg} \right)[/tex]

[tex]t \approx 3000000\,yr[/tex]

The age of the earliest known human-like footprints is approximately 3000000 years.

Pleaseee help ASAP
will mark brainliest!!! <3

Answers

The answer is A because Fluorine has 7 atoms in its valence shell.

Answer:

Fluorine belongs to the group 7 A so it must have 7 electrons in the oribits so the answer would be A as u count the electrons in the orbits, There are exactly 7 electron

Explanation:

What is the charge of protons?

Answers

Answer:

protons naturally have the charge of +1

Answer:Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms

Explanation:

Pls fill in the blank

Because it can either lose or share electrons when it combines with has some of the properties of metals and
other elements, each has some of the properties of nonmetals.

A. Metalloids

B. Sodium

C. Gold

Answers

A. Metalloids

They can either lose an electron or share an electron when it combines with other elements. They have some properties of metals and some properties of non-metals.

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