Answer: …
Explanation:
Which term is testable, a prediction, and can be supported or refuted by data?
At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30°C?
77°F
95°F
280K
300K
Answer:
95F
Explanation:
First we convert these temperatures into °C:
77°F = 25°C
95°F = 35°C
280K = 6.85°C
300K = 26.85°C
When temperature increases, water molecules have a greater average kinetic energy ans are more likely to collide with each other.
Out of the 4 temperatures, only 95°F (35°C) is of a higher temperature than 30°C. Hence 95°F is the answer.
the weather patterns seen on earth are influence greatly by
Answer: The butterfly effect
Explanation:
What is the OH- in a solution with a pOH of 7.68?
Answer:
Explanation:
Answer: 1.380 × 10^-8 M
The pH is the measure of alkalinity or acidity of a substance.
It is the negative logarithm of H+ ions concentration [H+].
pH = -log[H+]
pOH on the other hand is negative logarith of OH- concentration [OH-].
pOH = -log[OH-]
In this case;
pOH = 7.86
We can calculate the [OH-]
pOH = -log[OH-]
But, pOH = 7.86
pOH = -log[OH-]
-log[OH-] = 7.86
[OH-] = Antilog -7.86
= 1.380 × 10^-8 M
Therefore, [OH-] is 1.380 × 10^-8 M
What is the pH of a solution if the pOH is 7.09?
Answer:
pH = 6.91
Explanation:
Recall that at 25 °C, we have the relationship:
[tex]\displaystyle \text{pH} + \text{pOH} = 14.00[/tex]
Therefore, the pH of a solution with a pOH of 7.09 is:
[tex]\displaystyle \begin{aligned} \text{pH} + (7.09) & = 14.00 \\ \\ \text{pH} & = 6.91 \end{aligned}[/tex]
let's say these four solutions have the same concentration, which one has the highest freezing point?
Answer:
What are those for solution be specific
Which of the following elements is often used as a reactant in a nuclear fission reactor?
A. Hydrogen
B. Uranium
C. Carbon
D. Boron
Answer:
B
Explanation:
Uranium is windly use to reactant.
the volume of gas collected when the temperature is 11.0c and the pressure is710.mmHg measures 0.148L. what is the calculated volume of the gas (in mL) at 20.0c and 740.mmHg?
Answer:
The calculated volume of the gas (in mL) at 20.0c and 740.mmHg when volume of gas collected at temperature of 11.0° C and pressure of 710 mmHg measures 0.148L is 78. 1 mL
Explanation:
The combined gas law combines the three gas laws, Boyle's law, Charles's law and Gay- Lussac's law. It states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.
P V ÷ T = K
P1 × V1 ÷ T1 = P2× V2 ÷ T2
Parameters :
P1 = Initial pressure = 710.0 mmHg
V1 = 0. 148 L , converting it to mL = 0.148L × 1000 = 148 mL
T1 = Initial temperature = 11° C
P2 = Final pressure = 740 mmHg
V2 = Final volume in mL
T2 = Final temperature = 20° C
Calculations:
V2 = P1 × V1 × T2 ÷ P2 × T1
V2 = 710 × 148 × 11 ÷ 740 × 20
V2 = 1155880 ÷ 14800
V2 = 78.1 mL
Therefore, the calculated volume is 78.1 mL
In the space below draw a model of the atoms that make up a water molecule to show the charges of each of these atoms chemistry
Answer:
I didn't draw this but I think they're asking you to draw this
Explanation:
(Use P_T for total pressure; P_water vapor for water vapor pressure; P_hydrogen gas for hydrogen gas pressure)
From the Dalton's law of partial pressures, the pressure of the hydrogen gas is 91.83 kPa.
What is partial pressure?In a mixture of gases, the total pressure is the sum of the pressures of the individual gases in the mixture according to the Dalton's law of partial pressures.
In this case, the partial pressure of the hydrogen gas is Phydrogen, the partial pressure of water is Pwater and the total pressure is PT.
Hence;
Phydrogen = PT - Pwater
95 - 3.17 = 91.83 kPa
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At which position is the northern hemisphere experiencing winter?
The image includes the position and tilt of Earth in its orbit around the sun. Earth is tilted away from the sun in position A. In position B, the sun shines evenly on Earth from pole to pole. Earth is tilted toward the sun in position C. In position D, the sun shines evenly on Earth from pole to pole.
Public Domain
Point A
Point B
Point C
Point D
Answer:
Point A
Explanation:
The Northern Hemisphere is furthest away from the sun in position A. Therefore the sunlight takes longer to reach the Earth which results in the Northern Hemisphere experiencing winter.
Point A represents the position where the northern hemisphere is experiencing winter.
This is because Earth's axis is tilted away from the sun at this point, causing the northern hemisphere to receive less direct sunlight and shorter days. As a result, the rays from the sun are spread over a larger area, making the sunlight less intense and leading to colder temperatures during this time of the year in the northern hemisphere.
In contrast, at Point C, the northern hemisphere experiences summer. This is when the Earth's axis is tilted towards the sun, causing the northern hemisphere to receive more direct sunlight and longer days, resulting in warmer temperatures.
Points B and D are the equinox positions when the sun shines evenly on Earth from pole to pole, and both hemispheres experience approximately equal day and night lengths. These are the times of the year when transitions between seasons occur.
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(pls help!) What mass of oxygen atoms is required to react completely with 30 u of hydrogen atoms?
One mole Hydrogen need 1/2mol O_2 .
Moles of Hydrogen
30u/1u30molMoles of O_2
30/215mol[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's get to the reaction first ~
[tex] \qquad \qquad \rm 2H_2 + O_2 \rightarrow 2H_2O[/tex]
Here, we can infer that if we need 1 mole oxygen gas to react with 2 moles Hydrogen gas.
So, the number of Oxygen gas molecules we need to react should be half the number of Hydrogen gas molecules.
Number of Hydrogen gas molecules is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{30}{2} [/tex]
[tex]\qquad \sf \dashrightarrow \: 15[/tex]
Number of Oxygen gas molecules needed is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} [/tex]
Number of Oxygen atoms needed :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} \times 2[/tex]
[tex]\qquad \sf \dashrightarrow \: {15} \: atoms[/tex]
One atom of Oxygen weight 16 u, so 15 atoms weight ~
[tex]\qquad \sf \dashrightarrow \: {15} \times 16[/tex]
[tex]\qquad \sf \dashrightarrow \: 240 \: u[/tex]
So, we need 240 u of Oxygen atoms to react completely with 30 u of Hydrogen atoms.
A drinking glass and a tightly sealed jar sit on the kitchen counter. both are half-filled with water and are undisturbed for several hours. will the liquid and water vapor establish equilibrium in either container? explain your answer
A tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.
Will the liquid and water vapor establish equilibrium in either container?The liquid and water vapor establish equilibrium in a tightly sealed container but not in the drinking glass because in the tightly sealed jar, the water can't go into the atmosphere but in the drinking glass the water will evaporate.
So we can conclude that a tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.
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What is a network solid?
a
A. A crystalline solid held together by intermolecular forces
B. A crystalline solid held together by charge attractions
C. A crystalline solid held together by metallic bonds
O D. A crystalline solid held together by covalent bonds
SUBMIT
Network solids are chemical compounds that are bound together by a covalent bond. Thus, option D is accurate.
What are covalent bonds?Covalent bonds are the type of chemical bonds that mutually shares electrons between the atoms of the molecules of the compound.
A covalent crystal of network solids is held together by the covalent bond that can be seen in the structures of diamonds, graphite, silicon dioxide, etc.
Therefore, the network solids are option D. held by the covalent bonds.
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Select the correct answer. which element can bond with titanium (ti) to form a polar covalent bond? a. beryllium (be) b. fluorine (f) c. manganese (mn) d. nitrogen (n) e. oxygen (o)
The element that can bond with titanium (Ti) to form a polar covalent bond is Nitrogen (N).
What is a Covalent Bond?In this type of bond, the atoms of the element share only one electron. As an example, we can mention the chlorine gas Cl2, in which the two chlorine atoms share an electron to achieve chemical stability.
Hence, we can see that to bond with Titanium, there needs to be an element that would form a polar covalent bond and this is Nitrogen and this is because of their electronegativity difference.
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2. What is evolution?
Explanation:
Evolution is a biological process. It is how living things change over time and how new species develop.
Answer: It’s B
Explanation:
What is the IUPAC name
HCl(acid)+C₄H₈ (butene)⇒ addition reaction
name of the product: 2-cloro butane
A reaction between an alcohol and an organic acid is classified as.
Answer:
esterification reaction ...........
Reduction is a reaction that uses________to change a molecule into something else.
Answer:
chemical reaction
Explanation:
Reduction is the transfer of electrons between species in a chemical reaction where there is a process of gaining electrons or a decrease in the oxidation state by an element. A reduction chemical reaction involves increasing electrons associated with a single atom or a group of atom
According to Newton's second law of motion, a larger force acting on an object causes a greater(..................................) of that object
Answer:
acceleration
learnt this in 8th grade
acceleration
Newton's second law : F = m.a
F proportional to m and a
F > than a >
part 1: name the type of chemical reaction that occurs when calcium hydroxide (ca(oh)2) reacts with
nitric acid (hno3).
part 2: explain why zinc (zn) would react with lead nitrate (pb(no3)2) but not with calcium chloride
(cacl2).
The type of reaction that occurs between calcium hydroxide and nitric acid is a neutralization reaction.
What is a neutralization reaction?The term neutralization reaction refers to a reaction that occurs between an acid and a base that leas to the formation of salt and water only. The type of reaction that occurs between calcium hydroxide and nitric acid is a neutralization reaction.
The reason why zinc will react with lead nitrate and not calcium chloride is because lead is less than zinc in the electrochemical series hence it can be displaced from solution.
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3 Apply Many scientific words, such as matter, also have everyday meanings. Use context clues to write your own definition for each meaning of the word matter.
Example sentence
What is this gooey matter on the table?
Matter:
__________
Example sentence
Please vote! Your opinions matter.
Matter:
__________
Answer:
Explanation:
Use context clues to write your own definition for each meaning of the word matter.
Example sentence
What is this gooey matter on the table?
Matter:
__________
Example sentence
Please vote! Your opinions matter.
Matter:
__________
A sealed container of N2 gas has a pressure of 836 kPa at 54.7 ∘ C. After it is left out in the sun the pressure increases by 79.9 kPa. What is the new temperature of the container?
n the currently accepted model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the
In the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.
What is an atomic model?An atomic model is a graphic representation and/or diagram used to identify the components of atoms.
An atomic model may have into account all its components (i.e., electrons, protons, and neutrons).
In conclusion, in the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.
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HELP PLEASE ASAP WILL MARK BRAINLIEST
what is the amount of heat required to raise the temperature of 200.0g of aluminum by 10C (specific heat of aluminum: 0.21 cal/g C)
a. 420 cal
b. 4200 cal
c. 42,000 cal
d. 420,000 cal
Please show calculations!
Now
[tex]\\ \rm\Rrightarrow Q=mc\delta T[/tex]
[tex]\\ \rm\Rrightarrow Q=200(10)(0.21)[/tex]
[tex]\\ \rm\Rrightarrow Q=20(21)[/tex]
[tex]\\ \rm\Rrightarrow Q=420cal[/tex]
Answer:
AAAAA its A
Explanation:
Suppose much of an old forest will be used for farmland. A certain portion of the land will be set aside as wildlife habitat. You are asked to chose between the two plans outlined in A and B. The green areas represent the proposed reserve areas. Which plan will you recommend? Explain your reasoning.
Answer:
A certain portion of the land will be set aside as wildlife habitat
A few drops of food coloring are put into two containers of water. Observations are shown in the table. Which statement best explains the observations in the table? A) The temperature of sample 1 is higher than the temperature of sample 2 B) The molecules in sample 1 are moving faster than the molecules of sample 2 C) The temperature of sample 2 is higher than the temperature of sample 1 D) The water molecules in sample 2 are moving slower than the molecules in sample 1
Answer:
C
Explanation:
Increasing temp causes increased molecule movment in sample 2
Use the equation to answer the prompt. A student claims that the equation models beta-minus decay because the atomic number of the nucleus decreases by one. In one or two sentences, explain the error in the student's reasoning.
The error in the student's reasoning happened as they get confused between the beta minus decay and beta plus decay.
What is beta minus decay?A neutron is converted into a proton in beta minus, increasing the atomic number of the atom.
The proton is positive, while the neutron is neutral. The nucleus also produces an electron and an antineutrino in order to ensure charge conservation.In the given question beta minus decay is not occur as atomic number of the daughter nuclei does not increases. Rather than this in the given decay atomic mass of the daughter nuclei is less than the parent nuclei means plus beta decay is happened there.
Hence the error is in predicting the correct particle with charge.
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Explain why a solution of calcium conducts electricity but solid calcium chloride does not
Answer:
because the ions arent firmly held in place!
Explanation:
What is the name of the colony shown?
Answer: New Hampshire
Explanation:
If it is the dark green then its New Hampshire :)
Answer:
New Hampshire ;)
Explanation:
New Hampshire is the dark green state on this map, and it is apart of the first 13 colony I hope that helped.