Answer:
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Water (H2O) is a liquid at room temperature, while carbon dioxide (CO2) is a gas at room temperature. Why? Choose the two statements that apply.
Water has relatively strong hydrogen bonds holding the molecules together but CO2 has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO2 is a gas whereas H2O is a liquid at room temperature
33. Which element in Period 5 of the Periodic Table
is a transition element?
A) Sr
B) Ag C) Sb
D) Xe
Silver or Ag is the transition element present in period 5 of the periodic table.
What is periodic table?
Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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what happened if you poured lava on snow
Answer:
This is what could happen:
Explanation:
When lava meets ice, the resulting mess can cause flooding, destroy valuable resources and even produce explosions.
Answer: When lava meets ice, it neither explodes nor tunnels through; rather, it forms strange-looking bubbles.
Explanation:
Explain how the complexity and diversity of living things has changed over time
Answer:
Dylan invested $ 600 in a savings account at a 1.6 % annual interest rate . He made no deposits or withdrawals on the account for 2 years. The interest was compounded annually . Find, to the nearest cent, the balance in the account after 2 years. a₁ What information from the question is important ? b . How much does Dylan have in his bank account after 2 years ? Show work .
Help Please!
Fluorine - 19
Atomic number- 9
Atomic mass - 19
Answer:
Number of protons is 9
Number of electrons is 9
Number of neutrons is 10
Explanation:
Atomic number refers to the number of protons or electrons in an atom, so the electrons and protons are 9.
Atomic mass is the sum of the number of protons and neutrons.
Therefore, there are 10 neutrons in the atom's nucleus
Describe the difference between accuracy and precision. How do these two concepts relate to the idea of significant digits?
Answer:
Accuracy of a measured value refers to how close a measurement is to the correct value. The uncertainty in a measurement is an estimate of the amount by which the measurement result may differ from this value. Precision of measured values refers to how close the agreement is between repeated measurements.
Explanation:
How does a phase change from solid to liquid occur in a substance?
A. Heat energy is released from the substance, weakening the electrical attraction between molecules.
B. Heat energy is released from the substance, strengthening the electrical attraction between molecules.
C. Heat energy is added to the substance, weakening the electrical attraction between molecules.
D. Heat energy is added to the substance, strengthening the electrical attraction between molecules.
Answer:
see below
Explanation:
1. Heat energy is added to the substance, weakening the electrical attraction between molecules.
2. Both the melting point and boiling point are lower.
3. dipole
4. Water and ethanol have different molecular structures.
5. The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.
[quizlet: captncrun]
Heat is a form factor that changes the solid from light to light to gaseous mediums. The phases take place in a cyclic manner.
The solid to liquid changes take place due to the melting or fusion, solid to gas take lace through the sublimation, liquid to gas is by vaporization, and gas to liquid is condensation. Thus the heat is added and leads to the weakening of the electrical attraction within the molecules.Hence the correct option is C.
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As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato.
Why did the iodine solution change color on the potato?
A.
The iodine burned the potato and turned it to ash.
B.
The iodine mixed with the colors of the potato so it looked black.
C.
The iodine evaporated into a gas.
D.
The iodine reacted with the potato to form a new substance.
Answer:
d, the idiodine reacted
under the same conditions of temperature and pressure how does a liquid differ from a gas
is it difficult or easy to obtain hydro power
Answer:yes
Explanation:
cause yes
How many grams of solid sodium acetate should be added to 2.00 L of 0.184 M acetic acid solution to prepare a buffer with a pH of 4.140
pH = pKa + log [NaAc]/[HAc]
4.140 = 4.74 + log x
log x = -0.60
x = [NaAc]/[HAc] = 0.25
moles HAc = 1.50 L x 0.287 mol/L = 0.431 moles
moles NaAc = 0.25 x 0.431 = 0.1078 moles NaAc
grams NaAc = 0.108 x 80 g/mole = 8.64 grams
In a crystal of an ionic compound, each cation is surrounded by a number of what?
Answer:In a metal, atoms readily lose electrons to form positive ions (cations). These ions are surrounded by delocalized electrons, which are responsible for conductivity.
Explanation:
Due to the structure of ionic compounds, in a crystal of an ionic compound, each cation is surrounded by a number of oppositely-charged anions.
What are ionic compounds?Ionic compounds are compounds that are composed of oppositely charged ions held together by strong electrostatic forces of attraction.
The ions present in an ionic compound are the positively-charged ions known as cations and the negatively-charged ions known as anions.
Each of the oppositely-charged ions are attracted to each other.
Therefore, in a crystal of an ionic compound, each cation is surrounded by a number of oppositely-charged anions.
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Energy moves back and forth through the differnent ________.
TRUE or FALSE the term “anti-inflammatory” likely means “against inflammation”
Answer:
True
ANTI MEANS AGAINST
Explanation:
What is oxidation state?
Answer:
a number assigned to an element in chemical combination which represents the number of electrons lost (or gained, if the number is negative), by an atom of that element in the compound
Explanation:
sodium, magnesium, iron is zero.
The definition of oxidation state is as follows: Oxidation state is a number given to the atom of an element when participating in a chemical reaction.
OXIDATION STATE:The atoms of elements are not always neutral i.e. carry no charge. They sometimes carry either positive or negative charges to become ions. Ions can either be cations (positively charged) or anions (negatively charged). The amount of charges are represented by numbers placed as a superscript in front of the element involved. These superscript charge assigned to a corresponding element during a chemical reaction is called oxidation state. The oxidation state of an element portrays the number of electrons gained or lost during the reaction.Therefore, oxidation state can be defined as a number given to the atom of an element when participating in a chemical reaction.
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QUESTION 2
What is the pressure in atm of 0.742 mole of gas at 10.91 L and 291 K?
I
The pressure of this gas in atm is equal to 1.63 atm.
Given the following data:
Number of moles = 0.742 moleVolume = 10.91 LitersTemperature = 291 KIdeal gas constant, R = 0.0821 Latm/molKTo calculate the pressure of this gas, we would use the ideal gas law equation;
[tex]P=\frac{nRT}{V}[/tex]
Where;
P is the pressure.V is the volume.n is the number of moles of a gas.R is the ideal gas constant.T is the temperature.Substituting the given parameters into the formula, we have;
[tex]P=\frac{0.742 \times 0.0821 \times 291}{10.91} \\\\P = \frac{17.73}{10.91}[/tex]
Pressure, P = 1.63 atm.
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Every magnet must have what at its ends?
O A. A positive charge and a negative charge
B. A positive charge and a north pole
C. A north pole and a south pole
D. A south pole and another south pole
Answer:
one end is the north pole and the other is the south pole.
Explanation:
a north pole will attract a south pole; the magnets pull on each other. But the two north poles will push each other away. ... A compass is a tiny magnet balanced on a point so it can turn freely.
how could you distinguish an element from a compound
Answer:
Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions.
In your own words, explain why it is necessary to include only one chain-terminating/ synthesis-terminating nucleotide in each well of the electrophoresis instrument.
Answer: DNA sequencing methods employ chain termination nucleotides. Furthermore, if two chain-terminating nucleotides are employed in the same well, determining which strand is ended by which dideoxynucleotide will be impossible.
(its my own words, but i did search it to get this answer, hope it helps!)
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Rank the following molecules (1st, 2nd, 3rd, 4th) in the order that they melt.
Sucrose
Iodine
Sodium
Paraffin
There is a picture attached
Sodium chloride has the highest melting point while iodine has the least melting point.
The melting points of solid substances depends on the nature of intermolecular forces that exists in the substance. The stronger the magnitude of intermolecular forces in a substance, the higher its melting point.
The order of melting points of the solids shown in question is as follows;
1st - Sodium chloride2nd - sucrose3rd - paraffin4th - IodineSodium chloride has the highest melting points because it is an ionic substance. Among the molecular sucrose and paraffin, sucrose has a higher melting point than sucrose because it has a greater molar mass. Iodine, a molecular substance has the least molar mass and the least melting point in the list.
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Which term describes the process that continually moves water from the ground to the atmosphere and back? ASAP
A Evaporation cycle
B Humidity cycle
C Transpiration cycle
D Water cycle
a 35.66g sample of copper is heated using 600j of energy. if the original temperature of the copper is 85C what is its final temperature?
Specific heat of copper: 0.38j/gC
A -6.39
B 6.39
C -78.61
D 91.4
This problem is providing the mass, energy, initial temperature and specific heat of a sample of copper that is required to calculate the final temperature.
Thus, we recall the general heat equation:
[tex]Q=mC(T_f-T_i)\\[/tex]
Which has to be solved for the final temperature, [tex]T_f[/tex] as follows:
[tex]T_f=T_i+\frac{Q}{mC}[/tex]
Finally, we plug in the numbers to obtain:
[tex]T_f=85\°C+\frac{600J}{35.66g*0.38\frac{J}{g\°C} } \\\\T_f=129.3\°C[/tex]
However, this result is not given in the choices.
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10 POINTS
Answer:
F=ma
Explanation:
F=m×a
according to that F÷m=a and also F ÷a=m
Briefly explain the importance of ATP and its role in a cell.
Answer:
n energy-carrying molecule found in all living things' cells. ATP absorbs chemical energy from the breakdown of food molecules and uses it to power other cellular processes.
Explanation:
Hope it helps
ATP is a crucial energy molecule in cells, providing energy for various cellular processes.
ATP, or adenosine triphosphate, is often referred to as the "energy currency" of the cell. It plays a vital role in cellular metabolism by providing energy for various processes. ATP is composed of adenosine and three phosphate groups. The energy stored in ATP is released when the terminal phosphate group is hydrolyzed, forming ADP (adenosine diphosphate) and inorganic phosphate (Pi).
The role of ATP in a cell is multifaceted. Firstly, ATP powers cellular work by providing the energy needed for chemical reactions, such as biosynthesis, active transport, and muscle contraction. It acts as an immediate source of energy that can be rapidly used by the cell.
Secondly, ATP participates in signal transduction and cellular communication. It can be hydrolyzed to ADP and Pi, releasing energy that can activate signaling molecules and enzymes involved in cell signaling pathways.
Furthermore, ATP is involved in maintaining cell homeostasis. It provides energy for processes like ion pumps that maintain the electrochemical gradients across the cell membrane, allowing cells to regulate their internal environment.
Overall, ATP is crucial for the functioning of cells as it serves as an energy carrier, facilitating energy transfer and powering various cellular processes essential for growth, metabolism, and cell survival.
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una pieza de hierro de 25cm3 tiene una masa de 195g cual es su densidad?
Answer:
Pretend you are a TV producer. Think of ideas for new TV shows. Your objective is to create ideas that will be successful, regardless of whether this is quality programming or not. Think of an idea of a copy. Explain the basics of what this show will be like and what show it is copying. Explain why you feel this show will be popular. Think of an idea of a spin-off. Explain the basics of what this show will be like and what show it is spinning off from. Explain why you feel this show will be popular. Think of an idea for a TV show that falls into one of the genre categories listed in the genre chart. Describe the basics of the show and how it falls under the genre’s expectations for characters, plots, and aesthetics. Explain why you feel this show will be popular.
Pls help me will give brainliest.
Where is convection happening on Earth?
A. Atmosphere
B. Earth's outer core
C. Earth's mantle
D. Oceans
E. All of the above I
Answer:
C. Earth's Mantle
Explanation:
Answer:
C
Explanation:
Earth's mantle is the correct answer
The measurable properties of a substance, such as vapor pressure and surface tension, occur due to the strength of
electrical forces between particles, as given by Coulomb's law
electrical forces between particles, as given by Newton's law
gravitational forces between particles, as given by Newton's law
O gravitational forces between particles, as given by Coulomb's law
Answer:
electrical forces between particles, as given by coulombs law.
Explanation:
Properties of a substance such as vapor pressure and surface tension depend on electrical forces between particles, as given by Coulomb's law.
The vapor pressure refers to how easily a liquid converts to gas while surface tension is the force that makes a liquid surface act as a stretched elastic skin.
Both vapor pressure and surface tension has a lot to do with the degree of polarity in a molecule. Usually, polar molecules have a low vapor pressure and high surface tension due to a high electrical forces between particles, as given by Coulomb's law.
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what type of bacteria use the enzyme nitrate reductase to metabolize nitrogen oxides and transform them back to nitrogen gas?
Denitrifying Bacteria such as Pseudomonas aeruginosa is the type of bacteria that use enzyme nitrate reductase to metabolise nitrogen oxides to nitrogen gas.
Denitrification is the process whereby nitrites or nitrogen oxides is converted to nitrogen gas by a denitrifying Bacteria such as Pseudomonas.
Pseudomonas aeruginosa uses enzyme nitrate reductase to reduce nitrate to nitrite.
Then nitrite is then converted back to nitrogen gas.
Therefore, Pseudomonas aeruginosa is a type of bacteria that uses enzyme nitrate reductase.
help asap for brainlist
Answer:
Function A: +3
Function B: +2
y intercept is greater in Function B, the value is 16
Explanation:
If a certain person has a mass of 250kg on earth, would that person's mass be on the moon, if the moon's gravity is 1.62m/s2? *
245kg x 1.62m/s2
245 x 1.62m/s2
It remains the same
The person would be weightless
Answer:
it remains the same
Explanation:
mass is like name is not changed any where mass express the amount of matter in an object which is fixed any where regardless its gravity