Answer:
an endothermic reaction absorbs heat and cools its surrounding
Explanation:
what will you observe when you open a bottle of concentrated hydrochloric acid?
Answer:
Strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke.
Explanation:
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Zn(s) + Cu2+ —> Zn2+(aq) + Cu(s)
In this reaction, copper __ electrons, therefore it is the __ agent.
A. loses, reducing
B. gains, oxidizing
C. loses, oxidizing
D. gains, reducing
Answer: do you guys know the answer
Explanation:
Answer:
gains,oxidizing
Explanation:
Zn(s) + Cu^2+---> Zn^2+(aq) + Cu(s)
I got the answer right on usatp.
According to Dalton, atoms cannot be SELECT ALL THAT APPLY a Created b Destroyed c Subdivided d Bonded
Answer:
The answer is subdivided,created or destroyed
A gas measures 140 mL at 400 K find its volume at 120 K if the pressure remains constant.
By applying Charles law, the final volume of the gas is equal to 42 mL.
Given the following data:
Initial volume = 140 mLInitial temperature = 400 KFinal temperature = 120 KTo find the final volume of the gas, we would apply Charles law:
Charles law states that when the pressure of an ideal gas is kept constant, the volume of the gas is indirectly proportional to the absolute temperature of the gas.
Mathematically, Charles law is given by the formula;
[tex]\frac{V}{T} =k\\\\\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
Where;
T is the temperature of an ideal gas.V is the volume of an ideal gas.Substituting the given parameters into the formula, we have;
[tex]\frac{140}{400} = \frac{V_2}{120} \\\\140 \times 120 = 400V_2\\\\16800 = 400V_2\\\\V_2 = \frac{16800}{400}[/tex]
Final volume = 42 mL.
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Explanation:
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Answer:
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Explanation:
where is your question?
what volume will 28.0 g of O2 occupy at STP?
Considering the definition of STP conditions, 28 grams of O₂ will ocupy at STP 19.6 L.
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
On the other side, the molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
In this case, you have 28 g of O₂. The molar mass es 32 [tex]\frac{g}{mole}[/tex]
Next, you can apply the following rule of three: if 32 grams of the compound are contained in 1 mole, 28 grams are contained in how many moles?
[tex]number of moles=\frac{28 gramsx1 mole}{32 grams}[/tex]
number of moles= 0.875 moles
Now, you can apply the following rule of three: if by definition of STP conditions 1 mole of O₂ occupies a volume of 22.4 liters, 0.875 moles occupies how much volume?
[tex]volume=\frac{0.875 molesx22.4 L}{1 mole}[/tex]
volume= 19.6 L
Finally, 28 grams of O₂ will ocupy at STP 19.6 L.
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Who was the first person to introduce the concept of atomic mass?
Convert –26 degree Celsius temperature into kelvin .
how many different types of nucleotides are found in nucleic acids
Answer: four different types!!!!
Explanation:
What is the periodic table?
Answer:
The periodic table, also known as the periodic table of chemical elements, is a tabular display of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry.
Explanation:
The periodic table is a tabular arrangement of chemical elements that classifies elements according to repeating qualities and is structured by increasing atomic number. Metals are located on the left side of the table, whereas nonmetals are located on the right. The columns are referred to as groupings.
in pic
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How do catalysts generally affect chemical reactions? A They increase the temperature of the system. B They increase the surface area of the reactants. C They increase the activation energy by introducing enzymes. D They lower the activation energy by providing an alternate pathway.
Answer:
D
Explanation:
A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy without itself being consumed by the reaction.
Activation energy is the minimum amount of energy required for a chemical reaction to proceed in the forward direction.
A catalyst increases the reaction rate by providing an alternative pathway or mechanism for the reaction
Magnesium has three naturally occurring stable isotopes, 24Mg (abundance 78.99%), 25Mg (abundance 10.00%) and 26Mg (abundance 11.01 %). Calculate the relative atomic mass of magnesium, giving your answer to 2 decimal places.(2)
Explanation:
M = molar mass
p= percentage abundance
[tex]rel.atm.mass = \frac{ M1p1 + M2p2 + M3p3}{100} \\ r.a.m = \frac{24 \times 78.99 + 25 \times 10 + 26 \times 11.01}{100} \\ r.a.m = \frac{1895.76 + 250 + 286.26}{100} \\ = \frac{2432.02}{100} \\ 24.32[/tex]
BRAINLIST
how do you write the names and formulas for ionic compounds with polyatomics
Here are some steps i know from my teacher:
When you write a formula from a home you must follow these rules
1) Write down the name you must follow these rules
2)Write down the symbols for the elements and group in the compound of elements
3)Write down the valency
4)Adjust the number of atoms of each element or group valency is the combining capacity of elements with one another.
Beryllium (Be) has four electrons. Fluorine (F) has nine electrons. Which chemical formula shows the correct subscripts for the product of the reaction when beryllium and fluorine combine
Answer:
BeF2
Explanation:
The correct chemical formula for the product of the reaction when beryllium and fluorine combine is BF₂.
The valence electron of an atom determines how an atom goes into bonding.
Beryllium(Be) has 4 electron and has 2 valence electron. To fulfil the octet rule, it can easily give out this 2 electron during bonding.
Fluorine(F) has 9 electrons and 7 valency electrons. To fulfil the octet rule, it readily accepts a single electron.
The correct chemical formula for the product of the reaction when beryllium and fluorine combine is BF₂.
This means 1 atom of beryllium combines with 2 atoms of fluorine to form beryllium fluoride. The beryllium give its 2 valency electrons to the 2 atoms of fluorine. The 2 atoms of fluorine will now have a valency electron of 8 each. The octet rule has been fulfilled at this point.
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thank you for the points
Which animal resembles their parents already after being born or hatched?
what happens to the 1s orbitals on the hydrogen atoms as they approach to make a covalent bond?
i dont know im only doing for points
Answer: They begin to overlap
What must desert plants do to survive?
Ostore rainwater
Ogrow very tall
have big leaves
I need HELP A.S.P
B. A +ion (positive ion, one with extra positive charge)?
what causes chemical change in the stomach?
Answer:
The chemical change in the stomach, known as food digestion, is from the enzymes in the liver and stomach where they break down food molecules into even smaller molecules in order for them to be digested more easily.
C. A - ion (negative ion, one with extra negative charge)?
Answer:
Negative ion with one extra electron.
BRAINLIST Pls
Anions are the name for ions that have a negative charge. The body contains several common chemicals as ions. Sodium, potassium, calcium, chloride, and bicarbonate are typical examples.
What are anions ?Negatively charged electrons are called anion. When non-metals gain electrons, they are produced. They absorb one or more electrons. They have a negative charge overall as a result. The ion concentration iodide ( I- ), chloride ( Cl- ), and hydroxide are among examples ( OH– ).
The electrode where reduction takes place in any electrochemical cell is characterized as the cathode. On the other extreme, the positive electrode will draw anions, or negative ions, to itself.
Thus, when an atom obtains electrons, it transforms into the negatively-charged ion known as an anion.
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Explain why reaction speed increases with temperature.
How to add moisture to the air without a humidifier?
There are quite a few ways to add moisture into the air without a humidifier
A few things that can help add moisture are hanging your clothing to dry. hang drying your damp clothes will add moisture to the air over time as it evaporates and it will make your house smell like fresh clothes.
Another thing is a bath, allow the water to cool off and leave the bathroom door open, the steam will add moisture to the air as the water cools.
This might seem silly but putting bowls or vases of water out on the windowsill on a sunny day mill moistens the air as it evaporates.
You can also get houseplants, moisture evaporates from the leaves and stems of plants. transpiration can help increase the humidity in your home.
not sure if this is the answer you were looking for but if so im glad i could help. have a great day!
Why is seawater and corn syrup denser than the egg? explain plz no link
EASY QUESTION (PLEASE HELP THE INTERNET ISN'T SUCH A BIG HELP RIGHT NOW)
Things microscopes have helped scientists discover about cells.
(No links plz)
Answer:
Adding on to the answer said before, microscopes are pretty much one of the most significant tools used in Biology. It helped discover organelles, and smaller stuff like DNA, and prominently allowed Scientists to discover Bacteria and Archaea, the prokaryotic cells that contribute a big role in the functioning of soil, which is essential for our ecosystem.
What makes a balloon electrically charged?
A. Adding more air to the balloon
B. Placing the balloon against a wall
C. Rubbing the balloon against your hair
D. Running water over the balloon
Answer:
C
Explanation:
running the balloon against your hair
Blood has a mass-volume percent of NaCl of 0.9%. What mass (g) of NaCl is present in a liter of blood
The mass (g) of NaCl that is present in a liter of blood is 0.347g.
HOW TO CALCULATE MASS:
The mass of a substance can be calculated by multiplying the decimal mass-volume of the substance by its molar mass. According to this question, Blood has a mass-volume percent of NaCl of 0.9%. This means that 0.9/100 = 0.009g of NaCl is present in each 100g of blood. Molar mass of NaCl = 23 + 35.5 = 38.5g/molMass of NaCl in a liter of blood = 38.5 × 0.009Mass of NaCl in a liter of blood = 0.347g of NaCl. Therefore, The mass (g) of NaCl that is present in a liter of blood is 0.347g.Learn more at: https://brainly.com/question/15743584?referrer=searchResults
A solution of the ionic salt
Lihco3 would have ____ pH.
ANSWER : BASIC
A solution of the ionic salt Lihco3 would have 11.3 pH.
What is ionic salt ?In chemistry, salt exists as a chemical compound consisting of an ionic group of positively charged cations and negatively charged anions, which results in a combination with no net electric charge. A common example stands table salt, with positively charged sodium ions and negatively charged chloride ions.
The fragment ions in a salt compound can be either inorganic, such as chloride (Cl−), or organic, such as acetate (CH3CO−2). Each ion can be either monatomic, such as fluoride (F−), or polyatomic, such as sulfate (SO2−4).
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Which phrase best describes the vapor point of a substance?
the strength of the bonds between molecules of a substance that is in a gaseous state
the amount of heat energy required to change a substance from a liquid to a gas
the temperature at which additional heat energy causes the substance to change from a liquid to a gas
the average kinetic energy of the molecules of a substance in its gaseous state
The phrase which best describes the vapor point of a substance is Choice C; the temperature at which additional heat energy causes the substance to change from a liquid to a gas.
The vapour point of a substance by definition is the state of a substance at which upon addition of any amount of heat energy; he substance undergoes a phase change from liquid to solid.
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why does C10H22 not conduct electricity
Answer:
Decane doesn't have any free electrons because all the electrons of carbon is used for bonding.