what type of solid is H20 (ice)?
Answer:
Ice is a molecular and crystalline solid.
Explanation:
Water freezes at 0 degrees Celsius; it has strong molecular bonds between the hydrogen and oxygen atoms of each molecule, and weaker intermolecular bonds between each molecule of water. The polarity of the molecules helps align them into an organized, repeating patterned, crystalline structure when a solid.
Daniel is conducting an experiment on magnetic objects. He completes more than one trial. Why is it important for Daniel to do this?
The conclusion is less accurate.
The conclusion is more accurate.
There is a greater chance of error.
The results will be inaccurate.
Answer:The conclusion is less accurate.
Explanation:
Feb 17, 2021 — He completes more than one trial. Why is it important for Daniel to do this?
An 8.5 g. Of ethanol (C2H5OH) placed in a constant volume calorimeter and the temperature rose to 3.2°C. Find the heat of reaction of the ethanol (MM =46.1 g/mol) in kJ/mol. The heat capacity of the calorimeter plus water is read as 6.38 J/°C
Answer:
[tex]\Delta H_{rxn}=-0.111 \frac{kJ}{mol}[/tex]
Explanation:
Hello!
In this case, since the total heat flow due to the reaction equals the negative of the calorimeter's heat, we can first compute the former as shown below:
[tex]Q_{rxn}=-C\Delta T\\\\Q_{rxn}=6.38\frac{J}{\°C}*3.2\°C=-20.416J[/tex]
Now, since this total heat flow due to the reaction is defined in terms of the heat of reaction and the total reacted moles:
[tex]Q_{rxn}=n*\Delta H_{rxn}[/tex]
Thus, we compute the moles in 8.5 g of ethanol:
[tex]n=8.5g*\frac{1mol}{46.08g}=0.185mol[/tex]
Therefore, the heat of reaction results:
[tex]\Delta H_{rxn}=\frac{Q_{rxn}}{n} =\frac{-20.416J}{0.185mol} =-110.7J/mol\\\\\Delta H_{rxn}=-0.111 \frac{kJ}{mol}[/tex]
Best regards!
According to the reaction below, how many grams of KCl (potassium chloride) can be formed from 70.90 g of chlorine with excess potassium?
2K + Cl2 ---> 2 KCl
Answer:
149.1 g KCl
Explanation:
2 K + Cl₂ ⇒ 2 KCl
This is your chemical equation. Use this equation to figure out the stoichiometry between Cl₂ and KCl. According to the equation, for every 2 moles of KCl, you need 1 mole of Cl₂, making the ratio between KCl and Cl₂ 2/1.
First, convert grams of Cl₂ to moles of Cl₂. The molar mass is 70.906 g/mol.
(70.90 g Cl₂)/(70.906 g/mol) = 0.9999 mol Cl₂
Convert moles of Cl₂ to moles of KCl using the stoichiometric relationship.
(0.9999 mol Cl₂) × (2 mol KCl/1 mol Cl₂) = 1.9998 mol KCl
Convert moles of KCl to grams of KCl. The molar mass is 74.55 g/mol.
(1.998 mol KCl) × (74.55 g/mol KCl) = 149.1 g KCl
You will produce 149.1 g KCl.
Ammonium perchlorate NH4ClO4 is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas N2, chlorine gas Cl2, oxygen gas O2, water H2O, and a great deal of energy. What mass of chlorine gas is produced by the reaction of 3.3g of ammonium perchlorate? Be sure your answer has the correct number of significant digits.
Answer: 0.99 grams of chlorine gas is produced by the reaction of 3.3g of ammonium perchlorate
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
[tex]\text{Number of moles of } NH_4ClO_4=\frac{3.3g}{117.5g/mol}=0.028moles[/tex]
The decomposition of ammonium perchlorate is :
[tex]2NH_4ClO_4\rightarrow Cl_2+N_2+2O_2+4H_2O[/tex]
According to stoichiometry :
2 moles of [tex]NH_4ClO_4[/tex] produce = 1 mole of [tex]Cl_2[/tex]
Thus 0.028 moles of [tex]NH_4ClO_4[/tex] produce=[tex]\frac{1}{2}\times 0.028=0.014moles[/tex] of [tex]Cl_2[/tex]
Mass of [tex]Cl_2=moles\times {\text {Molar mass}}=0.014moles\times 71g/mol=0.99g[/tex]
Thus 0.99 grams of chlorine gas is produced by the reaction of 3.3g of ammonium perchlorate
Cuáles son el pHy PoH de una solución cuya concentración de iones hidronio [H+]es de 0.000475 M de acido sulfurico?
Who is wise president of india?
________________________
What type of galaxy is pictured?
A.) elliptical
B.) irregular
C.) lens
D.) spiral
so, a gas, and an
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3. Predict. If Joe wanted the reaction to "go faster," how could he change the procedure?
a) use a large sized piece of the solid Cu
b) lower the initial temperature below 25 °C for the liquid reactant, HNO3
c) use a 0.5 M HNO3 instead of 2.0 M HNO3
d) cut the large sized Cu solid into smaller sized pieces
Answer:
d) cut the large sized Cu solid into smaller sized pieces
Explanation:
The aim of the question is to select the right condition for that would increases the rate of the reaction.
a) use a large sized piece of the solid Cu
This option is wrong. Reducing the surface area decreases the reaction rate.
b) lower the initial temperature below 25 °C for the liquid reactant, HNO3
Hugher temperatures leads to faster reactions hence this option is wrong.
c) use a 0.5 M HNO3 instead of 2.0 M HNO3
Higher concentration leads to increased rate of reaction. Hence this option is wrong.
d) cut the large sized Cu solid into smaller sized pieces
This leads to an increased surface area of the reactants, which leads to an increased rate of the reaction. This is the correct option.
What is the molar mass of H2CO3?
(atomic mass: C = 12.01, H = 1.01, O = 15.99)
Answer:62.00 g/mol you just need to look up every element atomic mass, and then multiply it by the number of atoms and then add it
The molar mass is equal to the sum of atomic mass of an atom.The molar mass of H₂CO₃ is 60.99.
What do you mean by molar mass ?Molecular weight M is a chemical compound's mass divided by its amount of substance measured in moles. MB = m/nB, where m is the total mass of a pure substance sample and nB is the amount of substance B given in moles.
The weight of one mole of a sample is defined as its molar mass. To calculate a molecule's molecular mass, multiply the subscript (number of atoms) by the atomic mass of each element in the molecule, then add the masses of all the elements in the molecule.
Finding the molar mass of a single element is a piece of cake. All you have to do is look up the element's atomic mass on the periodic table.
Given:
atomic mass: C = 12.01, H = 1.01, O = 15.99
The molar mass of H₂CO₃ = 1 × 1.01 + 12.01 + 3 × 15.99
= 1.01 + 12.01 + 47.97
= 60.99
Thus, The molar mass of H₂CO₃ is 60.99.
To learn more about the molar mass, follow the link;
https://brainly.com/question/22997914
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WILD GUESS
OUT OF BAKUGOU SHOTO AND DEKU
GUESS WITCH ONE I SIMP FOR
Answer: all of them?
Explanation:
Answer:
Deku.
Explanation:
(GIVING BRAINLIEST)
....
Answer:
C
Explanation:
Because a planet is a celestial body distinguished from the fixed stars by having an apparent motion of its own (including the moon and sun), especially with reference to its supposed influence on people and events.
Answer:
it is the second one ;)
Explanation:
can someone explain how to do this, I don't understand?
Answer:
a) 2
b) 3
c) 5
d) 6
Explanation:
Please help me guys.
In a lab experiment which was done with a barometric pressure of 1.043 atm, some H2 was measured over water at 27.0°C to have a partial pressure of 0.035 atm . What is the partial pressure of the "dry" H2 in the container?
Answer:
1.008 atm
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 1.043 atm
Partial pressure of H₂ over Water (Pᵥᵥ) = 0.035 atm
Partial pressure of dry H₂ (Pₔ) =?
The partial pressure of dry H₂ in the container can be obtained as shown below:
Pₜ = Pₔ + Pᵥᵥ
1.043 = Pₔ + 0.035
Collect like terms
1.043 – 0.035 = Pₔ
Pₔ = 1.008 atm
Thus, partial pressure of dry H₂ in the container is 1.008 atm
_Na2B407 + _H2SO4(aq) +
H2SO4(aq) + -_H200 → __H3BO3(s) + __Na2SO4(aq)
Balance the Equation
Answer:
Na2B4O7 + H2SO4 + 5H2O → 4H3BO3 + Na2SO4
Explanation:
The unbalanced equation is given as;
Na2B4O7 + H2SO4(aq) + H2O → H3BO3(s) + Na2SO4(aq)
Balancing the equation of the reaction involves making sure the number of moles of elements in the reactants to be equal to the number of moles of the element of the products.
The balanced equation is given as;
Na2B4O7 + H2SO4 + 5H2O → 4H3BO3 + Na2SO4
what reaction is 3Pb + 2H₃PO₄ ----> 3H₂ + 1Pb₃(PO₄)₂ *
Answer: double replacement
Explanation:
Answer:
Single Replacement
Explanation:
A + BC --> AC + B
A=Pb
B=H
C=PO4
‼️‼️20 pt ‼️‼️HELP ‼️‼️
What is the effect on the graph of f(x) = x^2 when it is transformed to
h(x) = 1/6x^2 – 9?
A. The graph of f(x) is horizontally stretched by a factor of 6 and
shifted 9 units to the right.
B. The graph of f(x) is vertically compressed by a factor of 6 and
shifted 9 units down.
C. The graph of f(x) is vertically compressed by a factor of 6 and
shifted 9 units to the right.
D. The graph of f(x) is horizontally compressed by a factor of 6 and
shifted 9 units down.
Answer:
D.
Explanation:
The graph of f(x) is vertically compressed by a factor of 6 and shifted 9 units down
what is pollinations
Answer:
Explanation:
A pollinator is an animal that moves pollen from the male anther of a flower to the female stigma of a flower. This helps to bring about fertilization of the ovules in the flower by the male gametes from the pollen grains.
does anyone have the gizmo cell types answer key for activity d?
Answer:
im sorry i dont
Explanation:
0.2:
The bond angles of H20 and NH3 are not 109.5" like that of CH4, although O and N
atoms are sp hybridized is like carbon. Give reason.
Answer: due to bond pair - lone pair and lone pair -lone pair repulsion
Explanation:
In [tex]NH_3[/tex], nitrogen is the central atom and there are 3 Hydrogens as monovalent atoms. The number of electron pairs is 4 that means the hybridization will be [tex]sp^3[/tex] and geometry of the molecule will be pyramidal as there are three bond pairs and one lone pair.The bond angle for pyramidal geometry is 107°. The bond angle reduces due to lone pair bond pair repulsions.
In [tex]H_2O[/tex], oxygen is the central atom and there are 2 Hydrogens as monovalent atoms. The number of electron pairs is 4 that means the hybridization will be [tex]sp^3[/tex] and geometry of the molecule will be bent as there are two bond pairs and two lone pairs.The bond angle for pyramidal geometry is 104.5°.The bond angle reduces further due to greater lone pair-lone pair repulsions.
Scientists are very curious about the world around them. What are some
aspects of the world around you that you find interesting? How might you
study some of these aspects?
How does a hydroelectric power plant convert energy?
A. As water flows through the channels toward the turbines, it has kinetic energy. This is changed to mechanical energy as the water turns the turbines. Then the mechanical energy of the turbines is changed to electrical energy by the generator.
B. As water flows through the channels toward the transformer, it has potential energy. This is converted to electrical energy by the transformer, and then the energy is magnified by the generator.
C. As water flows through the channels toward the generator, it has potential energy. This is changed to electric energy as the generator rotates. Some of the electric energy is used to change water's energy into kinetic energy.
D. As water flows through the channels toward the turbine, it has kinetic energy. This is changed to potential energy within the turbine. This potential energy is converted to electrical energy by the transformer.
PLS HELP I WILL GIVE BRAINLYIST!!!
WILL GIVE BRAINLESS IF ALL ANSWER ARE CORRECT
Which of these is not a limiting factor for a population of squirrels?
a
Available space to build nests
b
Available water sources
c
Available friends to play
d
Available food to eat
Question 2 (4 points)
A decrease in limiting factors leads to an increase of biodiversity.
True
False
Question 3 (4 points)
If a disease destroying soybean plants in a field completely sweeps through an ecosystem, what would happen to the population of
songbirds that rely on the soybeans for food?
a
The songbird population would decrease
b
The songbird population will remain constant
c
The songbird population will increase rapidly
d
The songbirds will all crumple to the ground instantaneously
Question 4 (4 points)
Which of these limiting factors from the lesson is abiotic?
a
Predators
b
Food
c
Weather
d
Diseases
Question 5 (4 points)
Which of the following was given in the lesson as a limiting factor for organisms in the Caribbean Sea?
a
Amount of rainfall
b
Nesting locations
c
Water Temperatures
d
A lack of space within the mangrove swamps
Question 6 (5 points)
Are limiting factors positive, negative, or both for an ecosystem? Explain your reasoning
Question 7 (4 points)
When a population grows past the ecosystem's carrying capacity, what happens to the population?
a)It continues to grow
b)the population starts to die off to return to carrying capacity
c)The population will go extinct due to lack of resources
d)The population grows, then finds a new carrying capacity
Question 9 (4 points)
Will competition increase or decrease the carrying capacity of an ecosystem for the animals in competition?
increase
Decrease
Question 10 (4 points)
The largest number of individuals in a species that an environment can support long term...
a)Immigration
b)population Density
c)Emigration
d)Carrying Capacity
Answer:
See explanation
Explanation:
1) C
2) True
3) A
4) C
5) A
6) Both. Some species that rely on the limiting factors will be harmed and other species that are prey to those species relying on limiting factors will be benefited.
7) B
9) Decrease
10) D
Which element will form an ionic bond with chlorine (Cl): bromine (Br) or magnesium (Mg)
Answer:
The answer is Magnesium
Which of the following compounds would have a low
melfing and boiling point?
a Beryllium oxide
c. Lithium chloride
b. Triphosphorus pentoxide d. Rubidium bromide
Which BEST describes why fossil fuels are most often used for energy in the United States?
Answer:
fossil fuil is way easer to burn
Explanation:
also transport good luck!
Please help
Why it it not recommended to spill water over a fire that has erupted due to a short circuit?
Answer:
Dear frnd, water is a conductor of electricity and short circuit means a damage in electrical component in a device. Thus,water will spread the fire.
Explanation:
Pls mark as brainliest.Rocket Out
Ozone, O3, is produced in automobile exhaust by the reaction represented by the equation:
NO2 (g) + O2 (g) → NO (g) + O3 (g)
What mass of ozone is predicted to form from the reaction of 5.0 g NO2 in a car’s exhaust and excess oxygen?
Answer: 5.28 g of [tex]O_3[/tex] is produced.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} NO_2=\frac{5.0g}{46g/mol}=0.11moles[/tex]
The balanced chemical reaction is:
[tex]NO_2(g)+O_2(g)\rightarrow NO(g)+O_3(g)[/tex]
[tex]NO_2[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
According to stoichiometry :
1 mole of [tex]NO_2[/tex] produces = 1 mole of [tex]O_3[/tex]
Thus 0.11 moles of [tex]NO_2[/tex] will produce=[tex]\frac{1}{1}\times 0.11=0.11moles[/tex] of [tex]O_3[/tex]
Mass of [tex]O_3=moles\times {\text {Molar mass}}=0.11moles\times 48g/mol=5.28g[/tex]
Thus 5.28 g of [tex]O_3[/tex] is produced.
Which images show a container holding a heterogeneous mixture?