Radioactivity was discovered around:
1600
1700
1800
1900
PLEASE HELP!
The freezing of water at 0⁰C can be represented as follows: H2O (l) ↔ H2O(s) The density of liquid water is 1.00 g/cm3. The density of ice is 0.92 g/cm3. In 3 – 4 sentences explain why applying pressure causes ice to melt.
The application of pressure makes ice to melt. This is because of the factor that externally applied pressure decreases or diminishes the melting point of ice, so it gets to transform into water readily. With the lowering of the melting point, it permits more solids to get transformed into water. Thus, leading to the melting of ice. This procedure is also known as regelation.
The name of the commonly used hardness scale is: specific gravity organic Mohs inorganic
Answer:
The Mohs Hardness Scale is by far the most commonly used hardness scale.
Explanation:
14 POINTS
SUPER EASY
Hydrochloric acid (HCl) is created by a chemical reaction between hydrogen (H) and chlorine (Cl). Which substance is the product of this reaction?
hydrogen
chlorine
hydrochloric acid
Answer:
The product of this reaction is the hydrochloric acid
Explanation:
The compounds required to perform a reaction are the reactants, in this case there are two: hydrogen and chlorine.
The resultant compound is denominated the product. In this case, the hydrochloric acid.
The reaction is:
[tex]Cl_2 + H_2 \longrightarrow 2 HCl[/tex]
Which of the following are observations?
- The candle floats.
- The tires are flat.
- The dog is barking.
- The tire is flat because of a decrease in temperature.
- If a person walks by, then the dog will bark.
Which has the lighter mass one mole of platinum or one mole of zirconium?
The density of a gas containing carbon and oxygen at stp is 1.25g/l. what is the molar mass of this gas? what is its identity?
What is the total number of neutrons in an atom of 0-18?
Answer: The number of neutrons in given isotope are 10
Explanation:
Atomic number is defined as the number of protons or electrons that are present in a neutral atom.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Mass number = Number of protons + Number of neutrons
The isotopic representation of an atom is: [tex]_Z^A\textrm{X}[/tex]
where,
Z = Atomic number of the atom
A = Mass number of the atom
X = Symbol of the atom
We are given:
An isotope having formula: [tex]_{8}^{18}\textrm{O}[/tex]
Atomic number = Number of protons = 8
Mass number = 18
Number of neutrons = 18 - 8 = 10
Hence, the number of neutrons in given isotope are 10
In which situation would you expect to have the greatest speed assuming all molucules are eaqual?
A- A 20 Liter container that has 5000 molucules
B- A 20 Liter container that has 1000 molucules
C- A 10 Liter container that has 5000 molucules
D- A 10 Liter container that has 1000 molucules
Which of the following is not an example of a scientific model?
which observation would be best evidence of carbon cycling?
A.) water droplets
B.)moving animals
C.)plant growth
D.) dead plants
Answer: C.)plant growth
Explanation:
The carbon cycling is a process in which the carbon and it's various organic forms are transformed and delivered to various earth spheres such as biosphere, geospheres, hydrospheres, pedospheres and atmosphere. Carbon is the basic element found in all life forms. The cycling of carbon can best be observed in the plant growth. This is because of the fact that carbon is obtained by the plants in the form of carbon dioxide which is a chief ingredient required for the process of photosynthesis. Photosynthesis is necessary for the plants to produce food in the form of carbohydrates required for the growth and metabolism in plants.
Sodium chloride is formed when the metal sodium bonds to the nonmetal chlorine. the atoms are hold together by a
Answer:
abbylittle is correct. When Metals and Nonmetals bond, they are held together by ionic bonds.
Explanation:
How many grams are in 1.68 x 1026 molecules of CO2? (molar mass=44.01 g/mol) (Hint: You will need to use your entire stoichiometry flow chart)
Answer:
There is [tex]12277.494g[/tex] of CO2
Explanation:
We know that the molar mass of CO2 is [tex]44.01\frac{g}{mol}[/tex]
This means that in 1 mole of molecules of CO2 is 44.01 g of CO2
In one mole of molecules of any substance there are N molecules where N is defined as the Avogadro number.
[tex]N=AvogadroNumber=(6.02214076).10^{23}[/tex]
Therefore, we can write that
In [tex](6.02214076).10^{23}[/tex] molecules of CO2 (1 mole of CO2) there is 44.01 g of CO2 ⇒
In [tex](1.68).10^{26}[/tex] molecules of CO2 there will be x grams :
[tex]x=\frac{(44.01).(1.68).10^{26}}{(6.02214076).10^{23}}g=12277.494g[/tex]
We answer that in [tex](1.68).10^{26}[/tex] molecules of CO2 there is [tex]12277.494g[/tex] of CO2
What are geometric isomers?
A. compounds that have the same types of atoms arranged in different orders
B. compounds that have the same number of carbon atoms arranged in different orders
C. compounds that have the same atoms arranged in the same order, but with different three-dimensional orientations
D. compounds that have the same atoms arranged in the same order, and have the same three-dimensional orientations
Geometric isomers are compounds with the same atomic and bond composition but different spatial arrangements of the component atoms.
Geometric isomersThey are chemical compounds with the same chemical formula, the same atom/number of atoms with their respective bonds, but different arrangements of the atoms in space.
In other words, they are compounds with the same formula but different geometry of atoms.
When identical ligands are placed in the adjacent positions in geometric isomers, cis is used. When the ligands are in opposite positions, trans is used.
More on geometric isomers can be found here: https://brainly.com/question/13422357
#SPJ5
What is the oxidation state of each element in the species Mn(ClO4)3? I'm going over oxi-redox reactions from a long time ago and I'm trying to remember properly.
Mn=3+
Cl=7+
and oxygen=2- right?
calculate the mass, in grams, of 0.433 mole of calcium nitrate
Taking into account the definition of molar mass, the mass of 0.433 moles of calcium nitrate is 71.012 grams.
Molar mass is the amount of mass that a mole of a substance contains, which can be an element or a compound.
Calcium nitrate is an inorganic compound with the formula Ca(NO₃)₂. The molar mass of a compound is the sum of the molar mass of the elements that make it up multiplied by the times they appear in the compound.
In this case, the molar mass of the elements is:
Ca: 40 g/moleN: 14 g/moleO: 16 g/moleSo, the molar mass of calcium nitrate is:
Ca(NO₃)₂= 40 g/mole + 2×(14 g/mole + 3×16 g/mole)
Ca(NO₃)₂= 164 g/mole
Then it is possible to apply the following rule of three: if by definition of molar mass 1 mole of calcium nitrate contains 164 g, 0.433 moles of the compound contains how much mass?
[tex]mass of calcium nitrate=\frac{0.433 molesx164 grams}{1 mole}[/tex]
mass of calcium nitrate= 71.012 grams
Finally, the mass of 0.433 moles of calcium nitrate is 71.012 grams.
Learn more:
https://brainly.com/question/20423545?referrer=searchResultsCalculate the molality of a 27.0% (by mass) aqueous solution of nitric acid.
To calculate the molality of the aqueous solution of nitric acid, you first convert the mass of nitric acid to moles, then divide by the mass of water in kilograms. This gives a resulting molality of 5.86 mol/kg.
Explanation:The molality of a solution is calculated through the number of moles of solute per kilogram of solvent. To calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid, we first need to determine the number of moles of Nitric acid and the mass of the water. Since the given information is in percantage by mass, we can assume a solution weight of 100g, therefore we have 27g of Nitric Acid and 73g(0.073 kg) of Water.
Step 1: Convert 27g of Nitric Acid to moles. Nitric Acid(HNO3) has a molar mass of about 63.01 g/mol, so that 27g/63.01 g/mol=0.428 mol of HNO3
Step 2: Calculate the molality using the formula molality=n(solute)/m(solvent in kg). So, our molality = 0.428 mol/0.073 kg = 5.86 mol/kg or simply 5.86m.
Learn more about Molality here:https://brainly.com/question/26921570
#SPJ11
To calculate the molality of a 27.0% nitric acid solution, determine the masses of solute and solvent, calculate the moles of [tex]HNO_3[/tex], convert the mass of the solvent to kilograms, and use the molality formula. The molality of this solution is 5.87 m.
Calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid.
To calculate the molality of a 27.0% [tex]HNO_3[/tex]aqueous solution:
Determine the mass of solute ([tex]HNO_3[/tex]) and solvent (water). For a 100 g solution:
Mass of [tex]HNO_3[/tex]= 27.0 gMass of water = 100 g - 27.0 g = 73.0 gCalculate the moles of [tex]HNO_3[/tex]. Molar mass of [tex]HNO_3[/tex]= 1.01 g/mol (H) + 14.01 g/mol (N) + 3 x 16.00 g/mol (O) = 63.01 g/mol
Moles of HNO3 = 27.0 g / 63.01 g/mol = 0.4285 mol
Convert the mass of water to kilograms. Mass of water = 73.0 g = 0.073 kg
Calculate the molality. Molality (m) = moles of solute / mass of solvent in kg
Molality = 0.4285 mol / 0.073 kg = 5.87 m
The molality of the 27.0% aqueous solution of nitric acid is 5.87 m.
If 0.98 moles of BaCl2 are dissolved in enough water to make a 1.2-liter solution, what is the resulting molarity?
A. 0.55 M BaCl2
B. 0.82 M BaCl2
C. 1.2 M BaCl2
D. 0.45 M BaCl2
Which statement describes the Arrhenius interpretation of acids and bases
Answer:
It is limited to situations that involve aqueous solutions or specific compounds.
Explanation:
the answer was correct on edge
What is the volume of this graduated cylinder to the correct degree of precision? 44.0 ml 44 ml 44 cc3 0.44?
Answer:
It is 44.
Explanation:
I just did it on odyssey
The volume of the graduated cylinder to the correct degree of precision is 44 ml.
What is graduated cylinder?The volume of a liquid is typically measured in a laboratory with a graduated cylinder, commonly referred to as a measuring cylinder or mixing cylinder. It is narrowly cylindrical in form. The amount of liquid that has been measured is shown by each marked line on the graduated cylinder.
The volume of a liquid is frequently measured using graduated cylinders. Graduated cylinders are typically more exact and precise than laboratory flasks and beakers, but they shouldn't be used for volumetric analysis since they are less accurate and precise.
Instead, volumetric glassware, like a volumetric flask or volumetric pipette, should be used. The volume of a solid can occasionally be determined indirectly by measuring the displacement of a liquid using graduated cylinders.
Therefore, The volume of the graduated cylinder to the correct degree of precision is 44 ml.
To learn more about graduated cylinder, refer to the link:
https://brainly.com/question/14427988
#SPJ5
A jet engine might use _____.
slow combustion
rapid combustion
respiration
nitrous oxide
How many electrons does the predictable (most common) ion of calcium contain?
Object A has a length of 3 cm, a width of 2 cm, and a height of 4 cm. Object B is dropped into a graduated cylinder. It displaces 19 mL of water. The volume of object A is: A. greater than the volume of object B B. less than the volume of object B C. equal to the volume of object B
Answer:
greater than the volume of object B
Explanation:
Onversion of 1 mol of acetyl-coa to 2 mol of co_2 and coa via the citric acid cycle results in the net production of
Which choice is an example of a decomposer? Question 8 options: tree sun fungi bat
Answer:
fungi is the right answer
Explanation: took the test
How many moles of sodium chloride (NaCl) solute are in 155 grams of an 88.5 percent by mass solution?
Passing an electric current through a sample of water (H2O) can cause the water to decompose into hydrogen gas (H2) and oxygen gas (O2) according to the following equation. 2H2O mc026-1.jpg 2H2 + O2 The molar mass of H2O is 18.01 g/mol. The molar mass of O2 is 32.00 g/mol. What mass of H2O, in grams, must react to produce 50.00 g of O2? 14.07 23.05 28.14 56.28
The correct answer is D: 56.31 grams
Explanation: Got 90% on the quiz on edge and got this answer right
What is the relationship between a compound and the elements it is made from? (4 points)
The compound takes on a mixture of properties from the elements.
The compound takes on the properties of the stronger element.
The compound may have properties that are very different from those of the elements.
The compound may have the properties of the most abundant element in the compound.
Answer:
The compound may have properties that are very different from those of the elements.
Explanation:
For example - common salt, sodium chloride ( NaCl) has very different properties from sodium and chlorine
A system at equilibrium is placed under stress by adding more reactant. If this reaction has a small equilibrium constant (Keq), how will the addition of this stress affect the equilibrium of this system.
Question options:
The equilibrium will shift to produce more reactant.
The equilibrium will shift to produce more product.
There is no way to predict how the stress will affect this system without more information.
The reaction will generate more heat.
Tapeworms attach themselves inside the intestines of a pig. the worms then eat the pig's partially digested food. the pig is deprived of nutrients. which type of relationship does this represent?
a. commensalism
b. mutualism
c. competition
d. parasitism
The answer to this question is parasitism.