Answer:
One of the most important things we can do with heat is to use it to do work for us. A heat engine does exactly this—it makes use of the properties of thermodynamics to transform heat into work. Gasoline and diesel engines, jet engines, and steam turbines that generate electricity are all examples of heat engines.
Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points
Answer:
Polar
Explanation:
Electronegativity Difference:
0.7 Non-Polar Covalent = 0 0 < Polar Covalent < 2 Ionic (Non-Covalent) ≥ 2
Which statement accurately describes a P wave?
Answer:
A P wave can move through solid rock only. P wave can travel through liquid accurately describes a P wave.
CaC0³ scientific name is?
Answer:
CaC0³ scientific name is Calcium carbonate
Explanation:
Have a great summer :)
What is the percentage by mass of solution formed by dissolving 36.0 grams of HCl in 98.0 grams of water?
73.1%
36.7%
26.9%
24.2%
Answer:
26.9%
Explanation:
I just took the test! :)
The percentage by mass of solution formed by dissolving 36.0 grams of HCl in 98.0 grams of water is 36.7%.
How to calculate percentage by mass?The percentage by mass of a solution can be calculated by dividing the mass of the solute by the mass of the solvent, then, multiplied by 100.
percent by mass = mass of solute/mass of solvent × 100
According to this question, 36.0 grams of HCl is dissolved in 98.0 grams of water. The percentage by mass is calculated as follows:
percent by mass = 36g/98g × 100
percent by mass = 36.7%.
Therefore, the percentage by mass of solution formed by dissolving 36.0 grams of HCl in 98.0 grams of water is 36.7%.
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Describe the formation of calcium chloride (4 marks)
Answer:
It is an ionic compound that consists of one calcium cation Ca2+ and two chlorine anions. The bivalent calcium metal forms an ionic bond with two chlorine atoms. The formation of cacl2 happens mainly by reacting limestone (CaCo3) with hydrochloric acid (HCl).
Nitrogen and sulfur oxide gases originate from all of the following, EXCEPT
A . lightening Strikes
B. Volcano eruptions
C. Car exhaust
D . Plant Respiration ANSWER IT FOR 50 PIONTS!!!!!!!!!!!!!
Answer:
the answer is D (つ°ヮ°)つ （＾ω＾）
what does the periodic table allow chemist to do
a . organize compounds
b . develop atomic theory
c . predict properties of element
d . produce new elements
A student needs to make a solution of 308 mL of 0.02 M of Copper (II) Sulfate. All they have available is a solution of 0.250 M. How many liters should they use?
Answer:
this link not hacl belive me
https://www.flinnsci.com/api/library/Download/18ce587821c24fb3b0ad7d878bd6a3d9Explanation:
The equation below is for potassium oxide.
4K + O2 2K2O
What is the ratio of atoms of potassium to atoms of oxygen?
Answer:
The ratio of atoms of potassium to atoms of oxygen is 2:1
Explanation:
As the equation given is :
[tex]4K + O_2 -----> 2K_2O[/tex]The product formed is 2 moles of potassium oxide .
Amount of potassium atom in the potassium oxide is 2 atoms of potassium and amount of oxygen atom present here is 1 atom of oxygen .
But we have 2 moles of potassium oxide . So, the potassium and oxygen atoms will be multiplied by 2 .
Hence , we get 4 atoms of potassium and 2 atoms of oxygen .
Ratio of potassium to oxygen atoms is - 4:2
Therefore , 2:1
Answer:
2;1
Explanation:
The diagram below represents changes in the types of plants growing in the same area during four different time periods. Different types of plants
have been labeled for each time period.oo
Hardwood trees
Softwood trees
Small plants and
shrubs
Grasses
kanmummimaturday
Time
This change in plant types over time is an example of
Answer:
ecological succession
Explanation:
Answer:
ecological succession
Explanation:
I did this before
why do objects cool down
Answer:
wla dyan ang sagut ehh baka mali yan
Ventilation is governed by Boyle's Law, which states that at a constant temperature Multiple choice question. the solubility of a gas is inversely proportional to its volume. the pressure of a gas is directly proportional to its volume. the pressure of a gas is inversely proportional to its volume. the solubility of a gas is directly proportional to its volume.
Answer:
the pressure of a gas is directly proportional to its volume.
Explanation:
Robert Boyle was an Irish chemist and is famously referred to as the first modern chemist. He was born on the 25th of January, 1627 in Lismore, Ireland and died on the 31st, December 1691, London, United Kingdom.
Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.
Mathematically, Boyles law is given by;
[tex] PV = K[/tex]
[tex] P_{1}V_{1} = P_{2}V_{2} [/tex]
Where;
P1 is the original pressure.
P2 is the final pressure.
V1 is the original volume.
V2 is the final volume.
This ultimately implies that, ventilation which is typically governed by Boyle's Law, which states that at a constant temperature the pressure of a gas is directly proportional to its volume.
URGENT!!!
A 0.420 M Ca(OH)2 solution was prepared by dissolving 64.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution formed? (4 points)
1.07 liters
1.23 liters
2.05 liters
2.18 liters
Answer:
2.05 L is the correct answer.
Explanation:
w = 64 g
c = 0.420 M
m = 40 + (16+1)×2 = 74
[tex]c = \frac{w}{m \times v} \\ \implies \: v = \frac{w}{c \times m} \\ = \frac{64}{0.420 \times 74} \\ = 2.05 \: \: liters[/tex]
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The volume of the solution is given below which can be calculated using the molarity formula.
d. 2.18 litres
Molarity:It is defined as the ratio of number of moles of solute to the volume of the solution.
It is given by:
M= n/V
What information do we have?
M= 0.420M
mass = 64.0 grams
Molar Mass= 74g/mol
To find:
Volume of solution=?
Calculation for number of moles:
n= m/ M
n= 64/70
n= 0.91 moles
Molarity= n/V
0.420 M= 0.91 moles /V
V= 0.91/ 0.420
V= 2.1768 litres
Thus, the volume of the solution is 2.18 litres.
Find more information about Molarity here:
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5. Discuss the phenomena of sunrise and sunset seen on Earth and describe how they will be different from the perspective of outer space. PLS IM OFFERING13 STARS WHICH IS ALL OF MY STARTS PLEASEEE
Despite its appearance, air has a ‘thickness’ so when the sun is high in the sky the light travels through the air on a very much shorter path than when it is low on the horizon.
Imagine that air water and you are below the surface, the light from an overhead sun will be quite sharp and bright, but if lower in the sky it will have to travel through much more water to reach you, so will look less bright and sharp. It ma not seem the same, but the atmosphere is just like very thin water, and a low lying sun will be drastically reduced in strength, so all you will see is a sun with a shift to the red end of the spectrum as all the actinic part will be filtered away by that thicker atmosphere.
A presión de 3atm, 7L de un gas a temperatura constante experimenta un cambio ocupando un volumen de 0,5L ¿Cuál será la presión que ejerce? ayuda
Answer:
La presión que ejerce es 42 atm.
Explanation:
La ley de Boyle relaciona la presión y el volumen y dice que el volumen ocupado por una determinada masa gaseosa a temperatura constante, es inversamente proporcional a la presión.
La ley de Boyle se expresa matemáticamente como:
P*V=k
Ahora es posible suponer que tienes un cierto volumen de gas V1 que se encuentra a una presión P1 al comienzo del experimento. Si varias el volumen de gas hasta un nuevo valor V2, entonces la presión cambiará a P2, y se cumplirá:
P1*V1= P2*V2
En este caso:
P1= 3 atmV1= 7 LP2= ?V2= 0.5 LReemplazando:
3 atm* 7 L= P2* 0.5 L
Resolviendo:
[tex]P2=\frac{3 atm*7 L}{0.5 L}[/tex]
P2= 42 atm
La presión que ejerce es 42 atm.
Answer:10.5
Explanation:
3atm x 7L / 0,5L = 10.5
Quando bajamos el volmen sube la presion y cuando bajamos la presion sube el volumen
A container with a specific volume “V” changes to “2V.” What happens to the average distance between gas molecules? Assume that pressure and temperature of the gas remain constant.
Explanation:
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Which two elements make up the greatest percentages by mass in Earth’s crust?
(1) oxygen and potassium
(2) oxygen and silicon
(3) aluminum and potassium
(4) aluminum and silicon
The most appropriate option is :
[tex]\hookrightarrow \bf2. \: \mathrm{ \underline{oxygen \: \: and \: \: silicon}}[/tex]
Since, they are the most abundant elements found in Earth's Crust.
Oxygen (46%)Silicon (28%)[tex]\circ { \underline{ \boxed{ \sf{ \color{green}{ \mathrm{hope \: \: it \: \: helps \: \: you .....}}}}}}∘[/tex]
a. Is lithium (Li) more or less reactive than beryllium (Be)?
Answer:
Li is more reactive then Be.
Explanation:
As you go to the farther left and down on the periodic table, the higher that element reactivity is.
Vinegar, which contains acetic acid, is used in foods and has few safety concerns. Hydrochloric acid is used in chemistry labs and requires the use of safety goggles and gloves. Why do the safety concerns for these two acids differ? 2 ... Acetic acid is a weak acid, and hydrochloric acid is a strong acid.
Answer:
acid
Explanation:
What are two examples of mechanical waves?
• Radio
• Water
• Light
•Sound
Answer:
radio and sound
Explanation:
Because they are waves in motion
Calculate weight of anhydrous compound from remains upon dehydration of 2g copper sulphate pentahydrate
Answer:
1.28 g
Explanation:
Mass of anhydrous compound/molar mass of anhydrous compound = mass of hydrated compound/ molar mass of hydrated compound
Mass of anhydrous compound = ?
Mass of hydrated compound = 2g
Molar mass of anhydrous compound= 160 g/mol
Molar mass of hydrated compound = 250 g/mol
x/160 = 2/250
250x = 2 ×160
x= 2 × 160/250
x= 1.28 g
The sun revolved around the earth why ? help me
Answer:
You are moving because the Earth and everything in our solar system is constantly moving. ... As the Earth rotates, it also moves, or revolves, around the Sun. The Earth's path around the Sun is called its orbit. It takes the Earth one year, or 365 1/4 days, to completely orbit the Sun.
Answer:
um lol i think you mean Why does the earth revolve around the sun
its because the that the gravity of the Sun keeps the earth in its orbit
Explanation:
hope this helps!
Beryllium is in Group 2.
What does this tell you about the electronic structure of beryllium?
Answer:
[He] 2s²
Explanation:
A certain element has two naturally occurring isotopes. The atomic mass of isotope 1 (35.4723 % natural abundance) is 184.9529 amu. Determine the atomic mass of isotope 2. The average atomic mass of the element is 186.2071 amu. Do not include units; report answer to 4 decimal places.
Answer:
the value
Explanation:
Please help I have chemistry final
Answer:
Tick
1
2
4
6
Explanation:
magnesium is not a good conductor has some free electrons but it is not used that much in the industries because of other better alternatives.
You can tick number 5 as wlee. Good luck
Answer:
the answer is a
Explanation:
it'sa silver-white an earth metal
3KOH + FeCl3 → Fe(OH)3 + 3KCl
How many moles of Fe(OH)3 are produced along 7.5 moles of KCl?
Answer:
2.5moles of Fe(OH)3
Explanation:
i don't know how to explain this
which functional group defines an alcohol?
= O
-Na
-OH
-P04
Hurry please. What are 2 Cell organelles? Provide 2 analogies for each What level of organization are you (a human) considered? Show me another example
Answer:
Nucleus and mitochondria. Organism.
Explanation:
The two main organelles are the nucleus and the mitochondria . The nucleus is boss of the factory(controls everything). The mitochondria is the power house of the cell (provides the energy). Humans are organisms (made of organs systems working together) . Another example is plants they are also organisms
What is the molarity of a solution of 58.7 grams of MgCl2 in 359 ml of solution?
Answer:
1.72 M
Explanation:
Molarity is the molar concentration of a solution. It can be calculated using the formula a follows:
Molarity = number of moles (n? ÷ volume (V)
According to the information provided in this question, the solution has 58.7 grams of MgCl2 in 359 ml of solution.
Using mole = mass/molar mass
Molar mass of MgCl2 = 24 + 35.5(2)
= 24 + 71
= 95g/mol
mole = 58.7g ÷ 95g/mol
mole = 0.618mol
Volume of solution = 359ml = 359/1000 = 0.359L
Molarity = 0.618mol ÷ 0.359L
Molarity = 1.72 M