Why are prefixes often added to si units

Answer: i think its A.

Explanation: hope it helps :>

Answer:

1.) 2H2 + O2=2H2O

2.)Cl2 + 2KBr= 2KCl + Br2

4.)C4H12 + 7O2= 6H2O + 4 CO2

Answer:

Nuclear properties

Naturally occurring beryllium, save for slight contamination by the cosmogenic radioisotopes, is isotopically pure beryllium-9, which has a nuclear spin of 3/2.Beryllium is alloyed with copper or nickel to make springs, gyroscopes, electrical contacts, spot-welding electrodes and non-sparking tools, according to the Royal Society of Chemistry. Other beryllium alloys are used in high-speed aircrafts and missiles, as well as spacecraft and communication satellites.

Explanation:

hope this helps if not let me know

The pitch of sound increases with decrease in the air volume.

The pitch of sound increases with as decrease in the space available for the vibrating particles to vibrate decreases.

In the experiment with water in a glass and the pitch of sound:

Therefore, it was observed that the pitch of sound increases with decrease in the air volume.

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Answer:

William Stone (American Caver) became interested in caving in High school .

Answer:

b. Run FASTER than normal.

Explanation:

Standard temperature is 273 K or 0°C.

Hence, running the reaction at 60°C, which is higher than normal, would cause the reaction to run faster than normal.

Answer:

False

Explanation:

Chemistry is always around us

Answer:

2350kg of Al₂O₃

Explanation:

Step 1 : Write the balanced chemical equation:

4Al + 3O₂ → 2Al₂O₃

Step 2: Find the Ratio of Al : Al₂O₃

Al : Al₂O₃

4 :  2

2 : 1

4700: 2350

= 2350kg of Al₂O₃

Answer:

aqueous

Explanation:

Answer:

A. Ea, activation energy,, hope this helps.

Answer:

second option

O=C-OR

R

Explanation:

ester: A compound most often formed by the condensation of an alcohol and an acid, with elimination of water. It contains the functional group C=O. joined via carbon to another oxygen atom.

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use dimensional analysis and set up your equation like so:

[tex]450g\ x\ \frac{cm^3}{19.3g}[/tex]

if you do the calculations, the 'g' should cancel out which leaves you with the unit 'cm³'

[tex]cm^3=\frac{450g}{19.3g}[/tex]

[tex]cm^3=23.31606218...[/tex]

= 23.3 cm³

[tex]\text{Density,}~ \\\\~~~~~~~\rho = \dfrac{m}{V}\\\\\implies V = \dfrac{m}{\rho}\\\\~~~~~~~~~~=\dfrac{450 ~g}{19.3 ~ g~cm^{-3}}\\\\~~~~~~~~~~=23.3~ cm^3\\\\\text{Hence, the volume of 450g gold is }~23.3 ~cm^3.[/tex]

Answer:

Hydrogen chloride is a mixture of hydrogen and chlorine elements. The chemical abbreviation of hydrochloric acid is HCl.

Explanation:

The change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C

Heat transfer is defined as the process in which the molecules are moved from the region of higher temperature to lower temperature.

The heat transfer can be calculated by the formula

[tex]Q=m \times c \times \Delta T[/tex]

Here, Q is the heat supplied to the system,

m is the mass of the system,

c is the specific heat capacity of the system and

Δ T is the change in temperature of the system.

Substituting the values in the equation

m = 150g

Q=500 Joules

[tex]\rm c_{p}[/tex] = 4.18 J/gxC

500 = 150 * 4.18* Δ T

Δ T = 0.797 °C

Therefore the change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C .

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Answer:

Lithium

Explanation:

lithium because metallic character decreases down the group and lithium comes before in group then calcium

Answer:

The following evidences of plate motion are:

offset of rocks along the San Andres fault.

the age distribution of basalt at mid-ocean ridges.

the age distribution of the Hawaiian Islands

Answer:

rate = k[X][C]

Explanation:

When you are solving for rate law, you are only looking at the reactants of the slow reaction. In this case, step 2 is the slow one. Since there is only one X and one C on the reactants side, the coefficient in the rate law would each be one, which you don't need to include, as it is assumed.

Answer:

Cheap energy

Explanation:

Fossil fuels such as coal, oil, and gas are widely available and are much cheaper than other forms of energy (wind, nuclear, etc.) Fossil fuel products are also quite efficient, as the efficieny of fossil fuels is about 50% (which is actually really good), while solar panels for example are only about 15% efficient.

Answer:

17.1 L

Explanation:

P1V1/T1  =  P2V2/T2        T is in K

P1V1/T1 * T2/P2 = V2

735 * 7.31 / (45+273.15)  * (55+ 273.15)/325 = V2

V2 = 17.1 L

Answer:12668 J.

Explanation:

First of all, steam is there so in order to convert it into water it must have to release latent heat of vaporization which is equal to approximately 2450 kJ/kg or 2450 J/g.

So, the calculation is given below.

Heat released during conversion of steam at 100°C to water at 100°C= m*L

= 5*2450= 12250 J.

Heat released during conversion of water at 100°C to water at 80°C= m*Cp*(∆T)

= 5*4.18*20= 418 J.

So total heat released= 12668 J.

hope this helps:)!!!

The heat energy released or absorbed by a system can be calculated using calorimetric equation. The heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33858 J or 338 KJ.

Calorimetry is an analytical tool used to determine the heat energy q absorbed or released in a reaction system. The calorimetric equation connecting mass of the reactant m, specific heat capacity c and temperature difference ΔT is related by the expression:

q = mcΔT.

The mass of steam is given 60 g and temperature difference is from 235 to 100 °C thus 135 °C and the specific heat capacity of  water or steam is 4.18 J/°C. The heat energy released is calculated as follows:

q = 60 g × 4.18 J/°C × 135 °C

  = 33858 J

Hence, heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33585 J.

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The Gibbs free energy describes the spontaneity of the chemical reaction. The reaction involving nitroglycerine is spontaneous.

Spontaneity is the condition of the reaction that continuously makes the product without adding input energy again and again. It is determined by the Gibbs free energy of the system.

When the Gibbs free energy of the thermodynamic system is negative then the reaction is said to be exothermic and is a spontaneous reaction. The negative Gibbs free energy of nitroglycerine at 273 K shows spontaneity.

Therefore, the reaction is spontaneous.

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Answer:

0.1 moles

Explanation:

moles=5.0×0.200

Answer:

the abundance of non-native plants. this MAY be right.

Explanation:

i thought it would be an increase in pollution.

Moles are the ratio of grams to the grams per mole. There are 12 moles of oxygen after dissociation.

Dissociation is the release of the ions, cations, and anions of the molecular compound in the water. The dissociation of the compound is shown as:

Mn₆(ClO₄)₃  ⇆  6 Mn³⁺ + 3ClO⁴⁻

From the dissociation, it can be said that 1 mole of magnesium chlorate dissociates into 12 moles of oxygen atoms.

Given, that the moles of the compound is 1 mole.

Then moles of oxygen atom will be: 1 × 12 = 12 moles

Therefore, 12 moles of oxygen atoms are produced from the dissociation of the compound.

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Answer:

numbers

Explanation:

idek im just bored

Answer:

A

Explanation:

I would expect a gas to diffuse through another gas faster because gases generally diffuse much faster than liquids. Hence, A is the best option.