What does the hydrosphere include?
A.just the water in liquid form
B.all the water of Earth
C.just the water of the oceans
D.just fresh water in rivers and streams
Answer:
all the water of the earth
Explanation:
hydrosphere is the part of earth that is contained by water
The solubility of a substance can be measured in grams/liter. In a chemistry lab, Justin and Ellie are working with a substance that has a solubility of 12 grams/liter. This ratio means that 12 grams of the substance can dissolve in one liter of water. It would require liters of water to dissolve 36 grams of the substance.
Which object orbits Earth in both the Earth-centered (geocentric) and Sun-centered (heliocentric) models of our solar system?
A) the Moon
B) the Sun
C) Venus
D) Polaris
Answer:
the moon
Explanation:
What is the genetic makeup of both parents ?
Answer:
A, T, C y G, son las "letras" del código del ADN; representan los compuestos químicos adenina (A), timina (T), citosina (C) y guanina (G), respectivamente, que constituyen las bases de nucleótidos del ADN. ...El código genético es el conjunto de reglas que define cómo se traduce una secuencia de nucleótidos en el ARNm a una secuencia de aminoácidos en una proteína
In a reaction, your actual product had a mass of 13.7 grams. You calculated that you need 29.3 grams to have the reaction go to completion. What is your percent yield?
Answer:
5.0
Explanation:
Question 7 of 10
Which of the following is the correct name for N,03?
O A. Dinitrogen trioxide
O B. Nitrogen oxide
O C. Nitrogen trioxide
O D. Dinitrogen trioxygen
QUICK PLEASE:
Objects in the Kuiper belt could best be described as
giant asteroids
miniature stars
dirty snowballs
failed planets
Answer:
Dirty snowballs
Explanation:
Hydrogen and oxygen react to form a water which statement best describes the reactants and product at equilibrium
Answer:
H2 (g) + I2 (g) = 2HI (g)
Explanation:
Forward reaction:H2(g)+I2(g)→2HI(g)
Reverse reaction:2HI(g)→H2(g)+I2(g)
✓ What kind of carbon storages would be the least affected by humans?
Answer:
trio
Explanation:
is rubbing alcohol polar, non-polar, or ionic?
Answer: Rubbing alcohol molecules have a polar and nonpolar part, which means they are able to form hydrogen bonds with water and therefore able to mix with it.
Explanation:
A certain gas has a volume of 500.0 mL at 77.0°C and 600KPa. Calculate the temperature if the volume decreased to 400.0 mL and the pressure is increased to 760Kpa and assume the number of moles does not change.
Answer:
354.67K
Explanation:
Applying
P₁V₁/T₁ = P₂V₂/T₂................. Equation 1
Where Where P₁ = initial pressure, T₁ = Initial temperature, V₁ = Initial Volume, P₂ = Final pressure, V₂ = Final Volume, T₂ = Final Temperature.
From the question, we are ask to look for the final temperature,
Therefore we make T₂ the subject of the equation
T₂ = P₂V₂T₁/P₁V₁............. Equation 2
Given: P₁ = 600 kPa, V₁ = 500 mL, T₁ = 77 °C = (273+77) = 350 K, P₂ = 760 kPa, V₂ = 400.0 mL
Substitute these values into equation 2
T₂ = (760×400×350)/(600×500)
T₂ = 354.67 K
What is the purpose of an experimental group?
The purpose of having experimental groups is to have sufficient data to be reasonably sure the relationship between the independent and dependent variable is not due to chance.
Answer:
the purpose of an experimental group are:
to enable the experimental study of one variable at a timeto check a different resultPLSSS HELP MEE
CH3COOH + Mg
CH3-COOH+MgO
CH3 -COOH + Mg(OH)2
CH3-COOH + MgCO3
Explanation:
CH3COOH + Mg --> Mg(CH3COO)2 + H2
CH3COOH + MgO --> H2O + Mg(CH3COO)2
CH3COOH + Mg(OH)2 --> H2O + (CH3COO)2Mg
CH3COOH + MgCO3 --> (CH3COO)2Mg + CO2 + H2O.
*equations are not balanced.
hope it helps. :)
Which renewable resource gets its direct energy from the sun?
O Geothermal
O Solar
O Hydoelectric
O Eolic
Answer:
Solar
Explanation:
Solar mean sun
Example (Solar Panels)
Answer:
Solar
Explanation:
Solar is a renewable energy that receives direct energy from the sun.
PLEASE HELP ME!
I need the mass!!
1. What is the potential energy of a 8 kg ball that is at a height of 20 m?
2. What is the potential energy of a 3 kg ball that is on the ground?
3. What is the potential energy of a 5 kilogram ball that is 24 m from the ground?
PLEASE HELP 8 grade
Answer:
1. 1568 J
2. 0 J
3. 1176 J
Explanation:
PE = mgh
(PE = Potential Energy) = (m = mass)(g = gravitational force which is 9.8)(h = height)
1. (3)(9.8)(20) = 1568 J
2. PE = (3)(9.8)(0) = 0 J
3. (5)(9.8)(24) = 1176 J
The chemical equationP4O10+6H2O → 4H3PO4 P 4 O 10 + 6 H 2 O → 4 H 3 P O 4 can be interpreted correctly as
Answer:
1 molecule of P4O10 reacts with 6 molecules of H2O to form 4 molecules of H3PO4.
1 mol of P4O10 reacts with 6 mol of H2O to form 4 mol of H3PO4
Explanation:
It is important to interpret chemical equations in words. It is conventional to show chemical equations in symbols and then express those symbols in words and sentences when reading the chemical equation.
Considering the symbol equation;
P4O10+6H2O → 4H3PO4
It simply means that; 1 mol of P4O10 reacts with 6 mol of H2O to form 4 mol of H3PO4 or 1 molecule of P4O10 reacts with 6 molecules of H2O to form 4 molecules of H3PO4.
This is exactly the information coded in the chemical equation
pls complete the table with the correct answer
Answer:
The correct answer is :
Natural fibres: these fibers are found naturally in the environment such as cotton, hemp or wool, all are made naturally found fibers.
sr. no. name type
1 Cotton natural
2 Linen natural
3 Silk natural
4 Wool natural
5. Hemp natural
Artificial fibres: made from the polymerization of their monomer unit for example polyester made from coal and petroleum products.
sr. no. name type
1 Polyester artificial
2 Rayon artificial
3 Spandex artificial
4 Acrylic artificial
5. microfibers artificial
What impact did political parties in Africa have on the African desire for independence?
Why did African countries want independence?
answer:
After the Second World War people in Africa wanted change. Only Egypt, Liberia and Ethiopia were independent at that point. But it was Indian self-rule which triggered the momentum leading to independence.
Write in the process used to separate each mixture
Mixture
Process
salt + water
sugar + water
rice + pasta shapes
sand + water
four + rice
paperclips + sawdust
Answer:
Salt and water can be separated by boiling
Explanation:
When the water boils the salty water it heats it up and separates the mixture and only the salt will remain and the water will evaporate
What is hydrology?
А. the study of weather patterns throughout the earth
B. the study of oceans and freshwater sources
С. the study of the movement and distribution of water on earth
the study of the movement of air throughout the earth
Answer:
c
Explanation:
Hydrology is the study of the distribution and movement of water both on and below the Earth’s surface, as well as the impact of human activity on water availability and conditions.
Given the following equation: H2(g)+F2(g)=2HF(g)
How many grams of HF gas are produced as 5 mol of fluorine react?
Answer:
200grams
Explanation:
The balanced chemical equation for this reaction is given as follows:
H2(g)+F2(g) → 2HF(g)
This equation shows that it takes 1 mol of both hydrogen gas (H2) and fluorine gas (F2) to produce 2 moles of hydrogen fluoride (HF)
Hence, 5 moles of fluorine gas (F2) will produce 5 × 2 = 10 moles of HF.
In order to convert the mole value of HF to gram value, we use the following formula;
Mole = mass/molar mass
Molar mass of HF = 1 + 19 = 20g/mol
mass = mole × molar mass
mass = 10 × 20
mass = 200grams of HF.
BRAINLIEST AWARD!! Why is potassium nitrate a solute in a .3M potassium nitrate solution? Please explain:D
Answer:
In a .3M KNO3 solution, the KNO3 is dissolved in water. Water is the solvent and KNO3 is the solute, because the solute is what is dissolved. Also, all potassium compounds and nitrate compounds are soluble, so you know that KNO3 dissociates into K+ and NO3- in water.
An element A has an atomic number of 11 and another element B has an atomic number 17 (A
and B are not actual chemical symbols of elements)
i. What group on the periodic table does A belong?
(Imk)
ii. What type of bond will be formed between A and B? Explain.
(2mks
(lm
iii.
Write the formula of the compound that will be formed between A and B.
b. Arrange the species X, X and X in order of increasing size.
Give correct answer or else I will report you
Answer:
Agroup one.B group seven. lonic/electrovalent bonding.
sodium chloride, 2,8. 2,8,8
Explanation:
the reason why it is an lonicbonding is because it is a force of attraction between opposite charges.it involves the transfer of electrons from a metal to a non-metal.
A cube of iron at 20C is placed in contact with a cube of copper at 60C. Which statement describes the initial flow of heat between the cubes?
Answer:
the iron is more condensed then the copper more electricity
A 21.5 L sample of gas at 107 kPa has a temperature of 27.2 °C. What is the pressure of the gas
if it is transferred to a 32.6L container at 44.1 °C?
Answer:
The right answer is "74.516 kPa".
Explanation:
The given values are:
V₁ = 21.5 L
V₂ = 32.6L
P₁ = 107 kPa
T₁ =27.2°C+273
T₂ = 44.1 °C+273
As we know,
⇒ [tex]\frac{P_1V_1}{T_1}= \frac{P_2V_2}{T_2}[/tex]
then,
⇒ [tex]P_2=\frac{P_1V_1T_2}{T_1V_2}[/tex]
On substituting the given values, we get
⇒ [tex]=\frac{107\times 21.5\times (44.1+273)}{(27.2+273)\times 32.6}[/tex]
⇒ [tex]=\frac{107\times 21.5\times 317}{300.2\times 32.6}[/tex]
⇒ [tex]=\frac{729258.5}{9786.52}[/tex]
⇒ [tex]=74.516 \ kPa[/tex]
2C(s) + 2H2(g) → C2H4(g): ΔH = +52.4 kJ/mol
Which statement about this reaction is correct? (3 points)
Given an ion with a charge of +4, how many ions with a charge of -2 will be necessary to create a stable compound? Explain.
Answer:
[tex]\boxed {\boxed {\sf 2 \ ions}}[/tex]
Explanation:
A stable compound has a net charge of 0. Basically, when added, the two ion charges must equal 0 and balance each other out.
We have one ion with a charge of +4. There is another ion of -2. Clearly, these are not balanced yet.
We need more -2 ions to balance it. If we have 2 ions, then their charge is -4 because:
2 * -2 charge = -4 chargeThe +4 ion and 2 -2 ions (with a charge of -4) balance each other out and create a net charge of 0. So, 2 ions with a charge of -2 are necessary to create a stable compound.
A new solution you came up with that will help with water pollution
De una misma estación salen, en el mismo instante, dos trenes, con velocidades constantes de 72 y 90 [km/h]. ¿Qué distancia separa ambos trenes luego de 2 horas de viaje si se mueven en la misma dirección ... a) ... Y en el mismo sentido de circulación?
Answer:
144 km y 180 km respectivamente.
Explanation:
¡Hola!
En este caso, dado que tenemos dos trenes con velocidades diferentes, es posible multiplicar la velocidad de cada tren por el tiempo común, con el fin the hallar la distance recorrida; es de entender, que a mayor velocidad, mayor distance ha de recorrer el tren:
[tex]d_1=72km/h*2h=144km\\\\d_2=90km/h*2h=180km[/tex]
Así, entendemos que el tren número 1 recorre 144 kilómetros, mientras que el tren número 2, 180 kilómetros.
¡Saludos!