Answer the following question.

Answer:

2 elements

Explanation:

Octane is composed of carbon and hydrogen atoms.

Answer:

C. it would form a anion with a -1 charge.

Explanation:

The elements of group 17 are called halogens.

These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature.  Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.

They require only one electron to complete the octet and get stable. Thus they form anion with charge -1 when they gain electron.

l + e⁻  → I⁻

They form ionic compound with alkali and alkaline earth metal such as sodium chloride (NaCl), Barium iodide (BaI₂) etc.

Properties of Iodine:

1. it is present in solid form.

2. it is crystalline in nature.

3. it is very corrosive and has pungent odor.

4. it can not react with oxygen and nitrogen.

Answer:

26.7°C

Explanation:

Using the formula; Q = m × c × ΔT

Where; Q = amount of heat

m = mass

c = specific heat

ΔT = change in temperature

In this question involving iron placed into water, the Qwater = Qiron

For water; m= 50g, c = 4.18 J/g°C, Initial temp= 25°C, final temp=?

For iron; m = 30.5g, c = 0.449J/g°C, Initial temp= 52.7°C, final temp=?

Qwater = -(Qiron)

m × c × ΔT (water) =- {m × c × ΔT (iron)}

50 × 4.18 × (T - 25) = - {30.5 × 0.449 × (T - 52.7)}

209 (T - 25) = - {13.6945 (T - 52.7)}

209T - 5225 = -13.6945T + 721.7

209T + 13.6945T = 5225 + 721.7

222.6945T = 5946.7

T = 5946.7/222.6945

T = 26.7

Hence, the final temperature of water and iron is 26.7°C

Answer:

46.031

Explanation:

easy stuff

Answer:

Pressure is the force per unit area pounded onto the surface of a container of a gas or liquid. It's interesting to notice that the units of pressure (force/area) are the same as the units of energy density (energy/volume). This gives rise to the interesting result that the pressure at the centers of stars that we think should be sustaining the star against collapse actually attracts more pressure, at high enough pressures, and contributes to collapse

Explanation: this is what i would put ^-^

Answer:A

Explanation:

On ed2020

Answer:

n the sciences, the “tools” for measuring the volumes of liquids are generally made from glass, plastic or occasionally metal, although professionals referred to all of them as “glassware.” Scientists, and chemists in particular, have a variety of glassware at their disposal for measuring volumes. The particular piece of glassware chosen in any situation will depend primarily upon two factors: the required volume and the accuracy required for the measurement.

Explanation:

Hope this helps leave a heart c:

Answer:

C6H6

Explanation:

charge in the molecules of the wall material ,attracting and holding

Explanation:

Volume of gas produced = 3.36 L

as molar volume of gas at STP is 22.4 L

so

no of moles of H2 = 3.36 ÷ 22.4 = 0.15 mole

from balanced reaction equation

Zn + 2HCl = ZnCl2 + H2

Ratio of no of moles between H2 : HCl is 1:2

as H2 moles = 0.15 mole

so

HCl moles reacted = 0.15 × 2 = 0.3 mole

as HCl molar mass = 1 + 35.5 = 36.5 g/mole

so Mass of 0.3 mole of HCl = 0.3 × 36.5 = 10.85 gram

fraction of HCl in Solution

= 10.85 ÷ 109.5 = 0.1

0.1 ×100 so HCl is 10% of solution mass

Answer:

The average?

Explanation:

Explanation:

(1) Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei. ... (3) Rates of chemical reactions are influenced by temperature and catalysts.

C Cl is a covalently bonded compound with the formula CCl₄. MgCl is an ionic compound with the formula MgCl₂.

The formation of a chemical bond between two or more atoms, ions or molecules to form a chemical compound is known as chemical bonding. The chemical bonding makes sure the atoms are together in the resulting compound.

Chemical bonding is made possible by an attractive force resulting from the overall loss of energy in the resultant molecule compared to its constituents.

Chemical compounds depend on chemical bonding for their stability. There are various kinds of chemical bonds formed. Covalent bonds and ionic bonds are 2 of the most commonly known chemical bonds.

Covalent bonds are formed by the sharing of electrons and an ionic bond is formed by the electrostatic force of attraction between the atoms.

Therefore, in the given examples, C Cl is a covalently bonded compound with the formula CCl₄. MgCl is an ionic compound with the formula MgCl₂.

Read more about chemical bonds, here

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The bond of the following atoms in C-Cl and Mg-Cl is polar covalent bond in C-Cl  and  Mg-Cl ionic bond.

Polar covalent bonds are created between two non-metal atoms or molecules  that do consist of different  electronegativity. and the electronegativity difference that is not equal to zero and the shared pair of electrons forming a bond between will always be towards the high electronegative atom.

An ionic bond the  complete sharing or the  electron transfer. Ionic bonds basically form or created when the difference in the electronegativity of the two atoms is great or more as compare to   covalent bonds form when the electronegativity is same.

Therefore,  bond of the following atoms in C-Cl and Mg-Cl is polar covalent bond in C-Cl  and  Mg-Cl ionic bond.

Learn more about polar covalent and ionic bond, here:

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Answer:

1.a 2.d 3.c 4.b

Explanation:

Answer:

18.B

19.B

20.D

21.A

Explanation:

Answer:

Option D. 4.85×10¯¹⁹ J

Explanation:

From the question given above, the following data were obtained:

Frequency (f) = 7.31×10¹⁴ Hz.

Energy (E) =?

The energy of the photon of violet light can be obtained by using the following formula

E = hf

Where:

E is the energy.

h is the Planck's constant

F is the frequency.

Frequency (f) = 7.31×10¹⁴ Hz.

Planck's constant (h) = 6.63×10¯³⁴ Js

Energy (E) =..?

E = hf

E = 6.63×10¯³⁴ × 7.31×10¹⁴ Hz.

E = 4.85×10¯¹⁹ J

Therefore, the energy of the photon of the violent light is 4.85×10¯¹⁹ J

Answer: The combination of genes and environmental factors affects the growth of an organism.

Explanation:

Gene consists of DNA and it's heredity physical and functional unit. Genes play a vital role in a organisms growth. For example in humans, if one's parents are tall, there's a large tendency that such child will be tall and vice versa.

Environmental temperature also affects growth of living organisms. These include water soil pH, temperature, gender, chemicals etc. These all affects growth, it should be noted that proteins in living organisms can be damaged at a certain temperature which invariably affects the growth of such organism.

Also, the environment influences gene expressions as temperature, light, drugs, and chemicals, affects genes as they determine which ones will either be turned on or off which will further lead to how such organism grows.

Answer:

C. Asthenosphere

Explanation:

Answer:

Q must be supplied = 119523.3~J

Explanation:

The law of conservation of energy can be applied to heat changes, i.e. the heat received/absorbed is the same as the heat released  

Q in = Q out  

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

So from the question :

Q to the system(Q supplied) = Q water + Q steel vessel(Q gained)

Answer:

Mark me brainliest

Explanation:

Standards help avoid confusion and ambiguity when taking measurements. For example, a meter will always be the same length, no matter who is taking the measurement or where it is being taken.

Answer:

Protons

Explanation:

Protons are worth 1, while neutrons are neutral and are worth zero.

Answer:

220

Explanation:

2.2 x 10^2

You just move the decimal two units to the right...

Hope this helps:)

Answer:

A chemical change is required to separate the elements present in it.

Explanation:

The only true statement from the choices given is that water as a pure substance requires a chemical change to separate the elements present in it.

Water is a molecule consist of two atoms of hydrogen and one atom of oxygen.

Therefore, we see that only the first choice satisfies this problem.

Answer:

9.5E22

Explanation:

(1.9/12.011)×6.02E23

Answer:

I hope everything gets better

Explanation:

Answer:

I hope you are better now

Answer:

The part of the scientific method that involves making an educated guess is the "hypothesis".

Explanation:

Answer: What is the mass, in grams, of 135 mL of ethanol? d=0.789 g/mL - the ethanol density. V=135 mL - the volume of ethanol. m=0.789g/mL*135mL=106.515g ~ 106.5g- the mass of ethanol.

Explanation:

Hope this helps :)

Answer:

C

Explanation:

Took the test