Anyone know the answer to this question

Answer:

helium and argon

Explanation:

Answer:

Catalyst:

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

Answer:

Explanation:

Distilled water has a pH of 7. Anything below that is acidic. One is very acidic. So a b and c cannot be the answer.

Lime is a base. That means that when it is put in water, the pH is going to be greater than 7,

The only possible answer is D

Answer:

materials that allow heat to flow easily​ conductors of heat. For examples, aluminum, iron and copper.

Explanation:

Hope it helps!!!

Formation of precipitate is usually an evidence of a chemical change. The precipitate is a new substance that gets created due a chemical reaction between two or more different substances.  The precipitate can be the formation of a solid within a liquid or the formation of a solid within a solid due to a chemical reaction or change. The solid formation within a liquid is known as precipitate. This kind of chemical reaction can be seen in normal and daily life, as well as in laboratories.

Answer:

I think it is c.

Explanation:

the weight will increase

because Jupiter has a greater gravitational strength then earth, and the mass does not change wherever you go. So the only awnser that makes sense is c, Its weight will increase.

Please tell me if I'm right or wrong, thanks :)

Explanation:

Since Oxygen and Copper combine to form Copper Oxide. Therefore, this is a combination reaction

Hope this helps

Answer:

it releases energy

Explanation:

Answer:

It releases energy

Explanation:

The reactions involved in respiration are catabolic reactions, which break large molecules into smaller ones, releasing energy because weak high-energy bonds, in particular in molecular oxygen, are replaced by stronger bonds in the products.

Answer:

12 oxygen atoms

Explanation:

Multiply 3x4 and get 12 that's the easiest way I can explain it lol

Answer:

2621.75 j heat is required to increase the temperature 25.5°C to 46°C.

Explanation:

Given data:

Mass of sample = 142.1 g

Initial temperature = 25.5°C

Final temperature = 46°C

Specific heat capacity of Al = 0.90 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 46°C - 25.5°C

ΔT = 20.5°C

Q = 142.1 × 0.90 J/g.°C × 20.5°C

Q = 2621.75 j

Thus,  2621.75 j heat is required to increase the temperature 25.5°C to 46°C.

[tex]p = \frac{e}{t} [/tex]

where e is the energy.

& t is the time.

[tex]p = \frac{200}{5} = 40 \: w[/tex]

Ah, yes, these are all very special, and have different looks and textures, to learn about these awesome rocks,

Take a look at the chart shown.

Certain naturally occurring radioactive isotopes are unstable: Their nucleus breaks apart, undergoing nuclear decay. ... All elements with 84 or more protons are unstable; they eventually undergo decay. Other isotopes with fewer protons in their nucleus are also radioactive.

Answer:

hope it helps...

Explanation:

it is determined by the concentration of hydrogen ions, the percentage of hydrogen ions contained in the solution.

Let's take water as an example.

As you know, the formula for water is H2O. Most of the molecules in water are in that extremely stable form we know as H2O.

However, a very tiny percentage of those molecules have broken up into hydrogen ions (H+) and hydroxide ions, (OH-), as illustrated in the figure.

Actually, this balance of hydrogen ions and hydroxide ions determines the pH of the water.

When the hydrogen ions outnumber the hydroxide ions, the solution is acidic. If the reverse is true, then the solution is alkaline.

In pure water, the hydrogen ion (hydroxonium ion) awareness has to be equal to the hydroxide ion awareness. For every hydrogen ion fashioned, there may be a hydroxide ion shaped as nicely which means that you can update the [OH-] term inside the Kw expression with some other.

As the awareness of hydrogen ions in the solution grows, the greater acidic the solution becomes. As the extent of hydroxide ions will increase the greater primary or alkaline, the solution turns into.

Learn more about hydrogen ions here: https://brainly.com/question/26424076

#SPJ2

Answer:

13.6 m/v

Explanation:

d=m/v

d=680/50

d=13.6

Answer:

A common theory suggests that desert pavements are formed through gradual removal of sand and other fine particles by the wind and intermittent rains leaving behind the large fragments. ... Once the pavement is formed the removal of fine particles ceases because the pavement acts as a barrier to further erosion.

Explanation:

Off the top of my head I only have one example of evolution on humans lol

Wisdom teeth

Explanation:

Our ape-like ancestors used to use wisdom teeth to chew on bark and other hard foods. Today, we don't use them at all, and we're even at the point that some people are born with no wisdom teeth at all.

Answer:

Evolution is a change in the genetic makeup of a population over time.

A few evidences are:

Anatomy. Species may share similar physical features because the feature was present in a common ancestor (homologous structures).

Molecular biology. DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.

Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.

Fossils. Fossils document the existence of now-extinct past species that are related to present-day species.

Direct observation. We can directly observe small-scale evolution in organisms with short lifecycles.

Hope this helps! :D

Answer:

About 28.9 kJ.

Explanation:

Recall the formula for specific heat:
[tex]\displaystyle q = mC\Delta T[/tex]

Where q is the amount of heat released, m is the mass of the substance, C is its specific heat, and ΔT is the change in temperature.

Therefore, by substitution, we have that:
[tex]\displaystyle \begin{aligned} q & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right) \left(82.1^\circ\text{C}-30.7^\circ \text{C}\right) \\ \\ & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right)(51.4^\circ\text{C}) \\ \\ & = 28.9\text{ kJ}\end{aligned}[/tex]

In conclusion, about 28.9 kJ of energy is needed.

Answer:

Multicellular Organism

Explanation:

Unicellular organisms are made of one cell. For example, bacteria. Multicellular organisms are made up of more than one cell. For example, humans.

If the entire organism is one cell, that one cell carries out all the functions. In contrast, we have different cells to carry out different jobs. E.g. blood cells, skin cells, stomach cells and many more.  

Eutrophication causes loss of biodiversity because many species need light to survive. It affects light penetration in the water body.

Eutrophication is a phenomenon where an aquatic environment (e.g., a lake) is enriched with minerals and nutrients.

The most common nutrients associated with eutrophication are nitrogen and phosphorus.

Eutrophication can severely affect light penetration in the water body, thereby affecting the survival of producer organisms (plants) and causing a loss of biodiversity across all trophic levels.

Learn more about Eutrophication here:

https://brainly.com/question/8499582

Answer:

Evaporation

Explanation:

If the water is completely evaporated we will get separated sugar from the mixture. If we dissolve the mixture in alcohol we will get the salt separated while sugar will be dissolved in alcohol.

Answer: Electrons: 15 Atomic number :15

Explanation:

Answer:

element A has a mass of 2 units, while an atom of element B

has a mass of 5 units, what would be the mass of the

compound A3 B2

Explanation:

Answer:

A Golgi Body

B Vacuole

C Mitocondrian

D Nucleus

E Cell membrane

Explanation:

Answer:

2450000 gram

Explanation:

v= m × ρ= 1 cubic meter × 2.45 gram/cubic centimeter= 1000000 cubic centimeter × 2.45 gram/cubic centimeter= 2450000 gram

Explanation:

v=m over D

mass=20.oog

Density=2.45g

20.00-2.45

ans is 17.46

In both cases, the precipitates were AgCl and PbI2 respectively.

A precipitate is a solid product obtained from the reaction of two aqueous phase species. Let us now consider the two reactions listed in the question;

We can see that in both cases, the precipitates were AgCl and PbI2 respectively.

Learn more about precipitates: https://brainly.com/question/24846690

Answer:

B and B

Explanation:

edge 2022

Answer:

3. add water to develop the procedure.

4. of course,, because sugar dissolves and sand does not.

Answer: A. 27.43 kPa

Explanation:

Use the formula: PV/T = PV/T →

P(.776) / (298) = (32.6)(.664) / (303) →

.0026P = .07144 →

P = 27.43 kPa :)