Why are prefixes often added to si units
Answer:
b
Explanation:
b
Calculate the volume of 450g of gold (density=19.3 g/cm^3)
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]
Which of the following is the most likely impact of clearing natural landscape to construct high-rise buildings?
Decrease in pollution
Scarcity of drinking water
Increase in animal population
Abundance of non-native plants
Answer:
the abundance of non-native plants. this MAY be right.
Explanation:
i thought it would be an increase in pollution.
How much heat is released when 60.0 G of steam at 235°C is converted to water at 100°C?
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.
What is calorimetry?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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19. What is Beryllium's spin ?
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
How many moles of fluorine atoms are present in a sample that contains 4.14 moles of ?
SF4 mol
Answer:
The Avogadro number
One mole of atoms contains 6 x 10 23 atoms, no matter what element it is
Explanation:
5
Select the correct answer.
In the Arrhenius equation, which variable represents the activation energy for the reaction?
A. Ea
B. R
C.T
D.k
Answer:
A. Ea, activation energy,, hope this helps.
What mass of Al2O3 is formed in the reaction of 4700 kg of aluminum?
Answer in units of kg
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
A 30:70 (mole %) ratio of acetone:water is heated to 54.36 ∘C at 760 mmHg. What is the total vapor pressure of the system? The vapor pressures for acetone and water at 54.36 ∘C are 712 mmHg and 154 mmHg respectively.
Answer:
numbers
Explanation:
idek im just bored
Which has a higher metallic character?
A)Lithium
B)calcium
Please explain your answer
Answer:
Lithium
Explanation:
lithium because metallic character decreases down the group and lithium comes before in group then calcium
You are on a camping trip with your family. While you’re toasting marshmallows, one catches on fire.
List three more items that you might have on a camping trip that would burn.
List three items that wouldn’t burn.
Heat from a fire place is transferred out to the room it How does the heat from the fire place transfer out to the room?
What does the word transfer mean?
A. To move from one place to another
B. To block energy flow
C. To move for a new job
D. To move to a warmer place
Group of answer choices
Answer: i think its A.
Explanation: hope it helps :>
Running the reaction at 60 C would cause the reaction to...
a. Run SLOWER than normal.
b. Run FASTER than normal.
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.
When did Stone become interested in caving?
As a child
In high school
During college
After he was 30 years old
Answer:
William Stone (American Caver) became interested in caving in High school .
Which of the following results when hydrogen and chlorine chemically bond to form hydrogen chloride?
A.
a solution
B.
a mixture
C.
a precipitate
D.
a compound
Answer:
Hydrogen chloride is a mixture of hydrogen and chlorine elements. The chemical abbreviation of hydrochloric acid is HCl.
Explanation:
In which state do molecules have the highest kinetic energy? A. in the liquid state B. in the solid state
According to one acid base theory the water acts as ?
How many grams of rubidium are in 2.39 x 1024 atoms of rubidium?
Answer:
339 grams Rb
Explanation:
To find the final answer, you need to (1) convert atoms to moles (via Avogadro's number) and then (2) convert moles to grams (via molar mass from periodic table).
Molar Mass (Rb) = 85.468 g/mol
2.39 x 10²⁴ atoms Rb 1 mole 85.468 g
------------------------------- x ----------------------------- x -------------------- = 339 g Rb
6.022 x 10²³ atoms 1 mole
What state of matter is it ?
Answer:
aqueous
Explanation:
Chemistry equations are only used in a science lab, we don't use chemistry in everday life situations.
Please select the best answer from the choices provided
OT
OF
Answer:
False
Explanation:
Chemistry is always around us
A sample of argon (Ar) gas has a volume of 7.31 L at a pressure of
735 mm Hg and a temperature of 45 C. Determine the volume in
liters when the temperature changes to 55 C and the pressure
changes to 325 mm Hg.
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
Nitroglycerine (C3H5(NO3)) is a powerful explosive. The products of this reaction are
elemental oxygen, elemental nitrogen, water, and carbon dioxide. The Gibbs free energy for this
reaction is negative at 273 K. Determine whether the reaction is spontaneous.
The Gibbs free energy describes the spontaneity of the chemical reaction. The reaction involving nitroglycerine is spontaneous.
What is spontaneity?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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PLEASE HELP!! 30 PTS
Identify the combination reaction.
1.) 2H 2 + O 2 ⟶ 2H 2O
2.) Cl 2 + 2KBr ⟶ 2KCl + Br 2
3.) Al 2S 3 ⟶ 2Al + 3S
4.) C 4H 12 + 7O 2 ⟶ 6H 2O + 4CO 2
Answer:
1.) 2H2 + O2=2H2O
2.)Cl2 + 2KBr= 2KCl + Br2
4.)C4H12 + 7O2= 6H2O + 4 CO2
How many moles are in 0.50 g sodium bromide
What is the change in temperature of 150 grams of water when gains 500 Joules of energy?. The Cp for
water is 4.18 J/gxC
The change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C
What is Heat Transfer ?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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which of the following provide evidence of plate motion?
A. shapes of the continents
B. fossil s of the same species found on multiple continents
C. the age distribution of basalt at mid ocean ridges
D. the size of the continents
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
How many moles of NaCl are in 5.0 L of a 0.200 M solution?
Answer:
0.1 moles
Explanation:
moles=5.0×0.200
1
2
3
4
5
LO
6
7
B
8
9
10
Which functional group is found in an ester?
O=0
R R
O=0
o
с
/
R
OR'
R- OH
O
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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The proposed mechanism for a reaction is:
Step 1: A+B= X(fast)
Step 2: X+C - Y(slow)
Step 3: Y - D (fast)
Which rate law is consistent with this mechanism?
-
O A.
rate = k[A][B]
ОВ.
rate = K[X][C]
O C.
rate = k[A][B][C]
OD.
rate = k[X][Y]
=
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.