i need help with my assignment asap​

Answer:

1045

Answer: 1045 J of energy was released on cooling the down the water from 20 °C to 10 °C.

Answer:

..............=2100

Explanation:

Atoms in the equation are already in balance.

Answer:

it is d, got it right on EDG

Explanation:

Answer:

y or z one of those two i think its z but im so sorry if im wrong if not z then try y also I learned this last year.

Answer:

1,6,8

Explanation:

Periodic Table- H=1.C=6,O=8

Hydrogen is H, Carbon is C, Oxygen is O

One molecule of the sample contains three different elements with atomic numbers 1,6 and 8.

Element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.Each element has its own characteristic property.

Learn more about element,here:

https://brainly.com/question/1812430

#SPJ2

Your question is incomplete, but most probably your full question was,a sample substance has the chemical formula:

H2CO3

One molecule of the sample contains -

Two different elements with atomic numbers 1 and 27

Two different elements with atomic numbers 1, 6, and 8

Two different elements with atomic numbers 2 and 29

Two different elements with atomic numbers 2, 8 and 20

Three different elements with atomic numbers 1,6 and 8

um this is kinda weird I am take a guest SIF4

The formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4

From the question,

We are to determine which of the given formulae represents a tetrahedral molecule

In order to determine the molecule that represents a tetrahedral molecule, we will determine which of the molecules has a tetrahedral molecular geometry.

A tetrahedral molecular geometry has a central atom located at the center with four substituents that located at the corners of a tetrahedron

Among the given options, the molecule that has four substituents is SiF₄. Si is the central atom and the F atoms are the substituents.

Hence, the formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4

Learn more here: https://brainly.com/question/2108211

Answer:

Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.

Answer:

D. The total amount of energy in the system always stays the same

Explanation:

In the closed system, the total amount of energy in the system always stays the same.

Closed system is a arrangement in which exchange of energy or any material is restricted.

If any reaction is carried out in a closed system then energy of the system may convert from internal energy to potential or from potential to kinetic energy. But the total energy of the closed system is always remain same as before and after the reaction.

Hence option (D) is correct.

To know more about closed system, visit the below link:

https://brainly.com/question/1523500

Answer:

Sound waves and light waves need to change places.

Explanation:

Given table:

           Mechanical waves                        Electromagnetic waves

          Ocean water                                      Sound waves

          Light waves                                        Radiation waves

          Earthquake waves                             X-ray waves

From the given table, to be correct, light and sound waves must change their position.

Light wave is an electromagnetic wave

Sound wave is a mechanical wave

 An electromagnetic wave does not require a material medium for propagation.

  Mechanical waves require material medium for their propagation.

        Mechanical waves                        Electromagnetic waves

          Ocean water                                     Light waves waves

          Sound waves                                         Radiation waves

          Earthquake waves                                 X-ray waves

Answer:

Sound waves and light waves need to change

Explanation:

Answer:

A.  I and II only

Explanation:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.

Melting point also goes to decreases because there is large distance between the positive nucleus and bonded electrons thus overall attraction goes to reduced and less energy is required to melt.

Answer:

Low Tides

Explanation:

Took the test

100%

Answer:

A

Explanation:

You can eliminate C because you need to consult a periodic table to determine the mass (not the weight).

There are other answers you could use. The wording is awfully sloppy.  D is an example of that. The elements part is true, the atoms part is not really true in all cases.  For example NaCl is table salt and both the elements are ions, not atoms. Na is plus ion and Cl is minus one. B is wrong for the same reason.

I think in the end I would choose A.  I think this is a very sly question. It is not really testing chemistry. It is testing how well you know your definitions.

[tex]\mathrm {Hey, there!}[/tex]

The answer is: Bromine

Oxygen is not similar to flourine, it is not a noble gas with high ionization.

Neon does not have chemical reactions like flourine.

The answer is Bromine! Best of Luck!

Answer:

Br

Explanation:

wow isn't this interesting, I never would've thought to find u on here

Answer:

Phenolphthalein is an indicator. It is pink in alkaline solutions and turns colourless as the pH decreases.

It can be used to measure the activity of the enzyme lipase on the breakdown of lipids.

Samples of milk containing phenolphthalein were incubated with lipase at different temperatures.

The time taken for the phenolphthalein to turn colourless was recorded and used to calculate the rate of enzyme activity.

Figure 10 shows these results.

Picture

(a) (i) Explain why phenolphthalein turns colourless when lipase breaks down the lipids in milk. (2)

(ii) Describe the effect of temperature on the activity of lipase, as shown in Figure 10. (2)

(iii) Explain why the activity of lipase changes above a temperature of 40°C. (2)

(b) A student investigated the time taken for amylase to breakdown a 10% starch solution into glucose at 37°C. The student repeated the investigation five times.

Answer:

Element Y,  or the third option

Explanation:

Alkanes are insoluble in water, but soluble in ether.  Their boiling points are pretty low, barely reaching 200 degrees, so element Y is an alkane.

Answer:

c.

Explanation:

Answer:

Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. Therefore, there must be the same number of atoms of each element on each side of a chemical equation.

Explanation:

YW :)

Answer:276ml

Explanation:

Answer:

Nano silver is woven into fabric to give it anti-bacterial properties.

Explanation:

Helps by fending off the bacteria that make those clothes smell after you sweat. Nano-titanium dioxide adds sun protection to clothing just as it does in sunscreen. The use of nanoparticles to achieve fresh-smelling clothes and UV protection may not be safe.

Answer:

helllllooooooo hi how is life

Answer:

hiiii

Explanation:

Answer:

Boiling point is one of the answers

Answer:

80°F

Explanation:

Lukewarm means moderately warm. 80°C (176°F) water is extremely hot and could burn someone. 80°F (26 2/3°C) is moderately warm.

Answer:

Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem).

Explanation:

The chemical family that the element iodine should belong to is halogen.

The following information related to the halogen is:

Therefore we can conclude that the chemical family that the element iodine should belong to is halogen.

Learn more: brainly.com/question/13145357

Answer:

I believe- If there is more metal for the magnet to reach for, then the strength will grow but it may be harder to pick up off of a surface depending on the weight of the nail. If it is a light nail, it would be more efficient for a quick result in having the magnet to pick it up

Explanation:

Answer:

Ferromagnetic materials make the magnet stronger than non-ferromagnetic materials like paper, wood, or air. A wider nail will make the magnet stronger. Making the nail longer will not make the magnet stronger, unless you also add more turns to the coil.

Explanation:

I hope this helps!!

Answer:

Because they have complete electronic configuration

Explanation:

Group 18 elements are known as the noble or inert gases. The elements in this group are non-reactive because they have complete electronic shell configuration.

Answer:A substance must absorb heat energy so that it can melt or boil. The temperature of the substance does not change during melting, boiling or freezing - even though energy is still being transferred

Explanation:imm not sure