Answer:
Single Displacement (Substitution)
Explanation:
Answer:
single replacement
Explanation:
did the test !!
A student adds 3.00 g of dry ice (solid CO2) to an empty balloon. What will be the volume of the balloon at STP after all the dry ice sublimes (converts to gaseous CO2)?
2 Na + Cl2 --> 2 NaCl
According to the balanced equation above, how many Lof Cl2 at STP are
needed to completely react with 25.0 g Na?
Answer:
12.208 L
Explanation:
We'll begin by calculating the number of mole in 25 g of Na. This can be obtained as follow:
Mass of Na = 25 g
Molar mass of Na = 23 g/mol
Mole of Na =?
Mole = mass /Molar mass
Mole of Na = 25/23
Mole of Na = 1.09 moles
Next, we shall determine the number of mole of Cl2 required to react with 1.09 moles of Na. This can be obtained as follow:
2Na + Cl2 –> 2NaCl
From the balanced equation above,
2 moles of Na reacted with 1 mole of Cl2.
Therefore, 1.09 moles of Na will react with = (1.09 × 1)/2 = 0.545 mole of Cl2.
Thus, 0.545 mole of Cl2 is needed for the reaction.
Finally, we shall determine the volume of Cl2 required for the react as follow:
Recall: 1 mole of any gas occupy 22.4 L at STP.
1 mole of Cl2 occupied 22.4 L at STP.
Therefore, 0.545 mole of Cl2 of Cl2 will occupy = 0.545 × 22.4 = 12.208 L at STP.
Therefore, 12.208 L of Cl2 is needed for the reaction.
The main product of the photosynthesis reaction is
OA.
protein.
OB.
sugar.
Oc.
fat.
OD.
DNA.
Answer: Sugar
Explanation: Because after photosynthesis (Carbon dioxide, water, and sunlight) react, they make two products. Glucose (A sugar) and Oxygen.
CaO + H2O -> Ca(OH)2
3.50g of Ca(OH)2 was made from 4.20g of CaO? What is the % yield of Ca(OH)2?
The % yield of Ca(OH)₂ : 62.98%
Further eplanationPercent yield is the compare of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
CaO + H₂O ⇒ Ca(OH)₂
mass CaO= 4.2 g
mol CaO(MW=56,0774 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{4.2}{56,0774 g/mol}\\\\mol=0.075[/tex]
mol Ca(OH)₂ based on mol CaO
mol ratio CaO : Ca(OH)₂,= 1 : 1, so mol Ca(OH)₂ = 0.075
mass Ca(OH)₂(MW=74,093 g/mol) ⇒ theoretical
[tex]\tt mass=mol\times MW\\\\mass=0.075\times 74,093 g/mol\\\\mass=5.557~g[/tex]
% yield :
[tex]\tt =\dfrac{actual}{theoretical}\times 100\%\\\\=\dfrac{3.5}{5.557}\times 100\%\\\\=62.98\%[/tex]
True testing means that a serious effort is made to _________.
Question 8 options:
be absolutely positively, without a shadow of a doubt, correct.
create experiments that support your hypothesis
falsify (“disprove”) each possible explanation.
complete testing that supports manufacturers claims, so you can cash in and make money.
Explanation:
This explanation is the opposite of true testing - a term known as falsifiability. Falsifiability, when it relates to science, refers to how it should be possible to prove a hypothesis or theory wrong. Thus, the point of testing for falsifiability is to test in which condition is the theory wrong.
A term that might relate to the phrase ‘true testing’ used in the question would be testability. Which refers to the practice of testing a hypothesis or theory to see whether it is true or false.
True testing has been the scientific method that uses various steps to conclude the findings. "True testing means that a serious effort is made to create experiments that support your hypothesis." Thus, option B is correct.
What is True testing?True testing has been defined as the assessment scientific method that is involved in solving the question and issue by formulating the hypothesis and then researching the possible observations and solution that concludes and proves the findings.
It falsifies or proves the hypotheses right or wrong based on the experimental design setup. It does not falsify each possible explanation, nor is always fully correct. It also is not conducted to support the manufacturing and support it financially.
Therefore, option B. True testing experiments to sustain the hypothesis.
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She remembered that chemical equations can summarize what happens in a chemical reaction. What is the name of the two parts found on the left side of the equation below? 4 Fe + 3O2 → 2Fe2O3 A. products B. reactants C. scientific notation D. synthesis
Answer:
The name of the two parts found on the left side of the equation is reactants.
Explanation:
Chemical reaction is the way one substance reacts against another. That is, a chemical reaction is that chemical process in which two or more substances, by the action of an energy factor, are converted into other substances. The new substance (s) that are formed usually present a totally different appearance from that of the starting substances.
In a chemical reaction there are the substances that react, that is, the reactants, and the substances produced, called products.
A chemical reaction is represented by a chemical equation. The formulas of the reactants are written on the left, and those of the products on the right, both separated by an arrow indicating the direction of the reaction.
Reactants ⇒ Products
Then, the name of the two parts found on the left side of the equation is reactants.
51 liters of helium and 29 liters of oxygen (O2), both at 35°C and 1.0
atmosphere, are pumped into a tank that has a volume of 5 liters. Calculate the number
of moles of each component and the total pressure in the tank at 35°C
Answer:
If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, ... If I contain 3.0 moles of gas in a container with a volume of 60. liters and at a ... Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ... volume of 5.00 Lat 25.0C. Calculate the partial pressure of each gas and the ...
Explanation:
any help would be much appreciated, i'm being timed :( i'll mark brainliest and 5 star
Answer:
3 times ....
group 2
Explanation:
Mass Number
19
Atomic Number
Elements
Fluorine
Neon
Aluminium
Phosphorus
10
13
15
a. i. Which of the elements would not be capable of forming compounds
Answer:
Explanation:
The atomic number is the number of protons inside the nucleus of an atom. ... 1.1% carbon 13 with 7 neutrons and a mass of 13.00335 u (measured), and a ... The value given is the mass number of the most stable isotope of that element. ... That's because the chemistry of helium is more like neon (Ne), argon (Ar), etc.
9.25x10^-8 x6.40x10^3 in scientific equation
Answer:
5.92E-4 or 5.92x10^-4
Explanation:
1. If you need to name the alkane C7H16, which prefix and
suffix do you use? What sort of meaning do those prefix and
suffix convey?
The name is heptane. The prefix is hept- , because the longest carbon chain contains seven carbons. The suffix is -ane, because this is the suffix used for all alkanes.
Please mark brainliest if you can!!!
can yall help me wit this?
Answer:
the color change
molecules of solid ice cannot
Anything that has mass and takes up space is ____
A. Solid
B. Matter
C. Gas
D. Liquid
Answer:
d
Explanation:
(d) Liquid O2 conforms to the shape of its container but has a fixed volume; it contains relatively densely packed molecules. (c) Gaseous O2 fills ...
Missing: ice | Must include: ice
Chemistry
How many Fluorine ions are there in 202 grams of CaF2
HINT: Find the percentage of Fluorine in Calcium Fluoride, then find out how many grams of fluorine are in 200 grams of Calcium Fluoride. Lastly solve for ions
There are 48.72 g Fluorine ions
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
%F in CaF₂ :
[tex]\tt \%F=\dfrac{2.Ar~F}{MW~CaF_2}\times 100\%\\\\\%F=\dfrac{2.19}{78}\times 100\5=48.72\%[/tex]
mass of Fluorine :
[tex]\tt 48.72\%\times 200=97.44~g[/tex]
So mass Fluorine ions(2 ions F in CaF₂⇒Ca²⁺+2F⁻) :
[tex]\tt =\dfrac{97.44}{2}=48.72~g[/tex]
Which of the definitions below is best for the word molecule? Atoms of different elements chemically joined together More than one atom chemically joined together A type of compound More than one atom of the same type chemically joined together A group of atoms together
Answer: More than one atom of the same type chemically joined together
Explanation:
An atom is the smallest unit of any matter which may or may not have independent existence. Example: Argon (Ar) is an element which exist as Ar atom only.
Molecule is the smallest unit of any matter which always have independent existence. For example: Hydrogen (H) is an element which can exist in nature as [tex]H_2[/tex] molecule only.
Atoms of different elements chemically joined together is called as a compound. Example: [tex]H_2O[/tex] is a compound formed by chemical combination of hydrogen (H) and oxygen (O) atom.
How many kilograms is 0.22 lb?
O A. 0.22 kg
O B. 0.454 kg
C. 0.0998 kg
O D. 0.49 kg
Answer:
C)0.0998kg
explanation:
1 POUND=0.453592...kg
Which of the following best represents and explains the formula for a compound made from fluorine and hydrogen?
A. HF, because both fluorine and hydrogen are capable of forming only one ionic bond.
B. HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
C. H2F, because fluorine is short of two electrons, and hydrogen is short of one electron.
D. H2F, because fluorine is capable of forming one, and hydrogen is capable of forming two covalent bonds.
Thank you
The answer is B
HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond. The correct option is option B.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion. Covalent bond is weaker than ionic bond.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron.
The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
Therefore, the correct option is option B.
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Which of the following molecules has a central atom with precisely two unshared
pairs of electrons?
what volume of water has a mass of 1 kg
Answer:
[tex]V=0.001\ m^3[/tex]
Explanation:
Mass, m = 1 kg
The density of water, d = 1000 kg/m³
We need to find the volume of water. The formula for the density of an object is equal to mass divided by volume. Its formula is :
d = m/V
V is the volume of water
[tex]V=\dfrac{m}{d}\\\\V=\dfrac{1\ kg}{1000\ kg/m^3}\\\\=0.001\ m^3[/tex]
So, the volume of water is [tex]0.001\ m^3[/tex].
Answer:
Volume of water has a mass of 1 kg is explained below in details.
Explanation:
One liter of h2O has a volume of approximately specifically one kilogram when estimated at its maximum frequency, which happens at about 4 °C. It observes, therefore, that thousand of a liter, recognized as one milliliter (1 mL), of h2O has a volume of about 1 g; 1000 liters of h2O has a volume of about 1000 kg (1 tonne).
Need help. Is this correct
Answer:
Yes, that is correct!
Explanation:
Answer:
Yes
Explanation:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
Is it possible for two different compounds to be made from the exact same two elements? Why or why not? With a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?
PLEASE HELP ASAP
Thank you!!
Answer:
Yes. The two elements can combine to form different compounds.
Explanation:
Two elements can combine at different ratios.
Consider CO and CO₂. Both are made from carbon and oxygen. However, C and O combine at a 1:1 ratio in CO but at a 1:2 ratio in CO₂. CO is a fuel; it burns in the air. CO₂ does not burn in the air; it is used to put out fires and is found in extinguishers. CO and CO₂ are two distinct compounds.
There are many ways for the elements to combine with each other. As a result, the first twenty elements on the periodic table alone can produce a large number of compounds.
convert 80kg into grams
Answer:
80000 grams
Explanation:
kilo means 1000
80 x 1000 = 80, 000
What type of plate boundary forms
snowy mountains?
J. convergent
K. divergent
L. transform
M. transition
Answer:
I believe it's j, convergent plate boundaries
The type of plate boundary that forms snowy mountains are convergent plate boundaries. option J is correct.
What are convergent plate boundaries?The convergent plate boundaries are which consist of two plates that move toward each other which results in the process called collision of two plates with each other.
The snowy mountains are full of snow which melts due to the change in temperature and leads to the formation of different plates and boundaries and the collision of two continental plates leads to the formation of this.
Therefore, option J is correct, the type of plate boundary that forms snowy mountains are convergent plate boundaries.
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Based on the diagram, which statement explains how energy is conserved
during this chemical reaction?
А
B
Potential energy
of a system
С
Reaction progress
O A. The potential energy gained by the reaction system (A) is lost
from the surroundings.
B. The potential energy lost by the reaction system (C) is gained by
the surroundings
C. The potential energy changes indicated by A and B involve energy
lost by the surroundings.
D. The potential energy lost during the formation of products (B) is
lost by the surroundings.
PLEASE HELP and try not to get it wrong :(
Answer:
it's B it's B It's B BBBBBBBBBBBBBBB
Which of these common substances is a mixture?
A Sulfur
B Pure Water
C Spagettios
D Nitrogen
Answer:
D
Explanation:
A is a compound
B is purified water
C is a substance made by two substances
Hope this helps
How many molecules are in 4.5 moles of Ca(OH),?
We will use dimensional analysis to solve this.
We will need to know Avogadro's number, which is 6.02 × 10²³.
4.5 mol × [tex]\frac{6.02 * 10^{23} molecules}{1 mol}[/tex] = 2.71 × 10²⁴ molecules.
There are 2.71 × 10²⁴ molecules in 4.5 moles of Ca(OH).
NEED HELP PLSSSS THANK UU
Answer: rotation
Explanation:
orbitttttttttttt
Explanation:
whats the diffrence beetween fluids and nonfluids
Answer:
One is a fluid and one is not.
Explanation:
Fluid is a common state of certain substances, or a type of matter. Liquid is one of the three phases or state of matter. Fluids flow and has some viscosity (thickness). Liquids also flows and it has volume, but no definite shape. A non fluid is a substance that is not a liquid.
Answer:
one is limited and one isn't
Identify two reasons why the relative size of an atom become smaller due to the loss of electrons .
Answer:
nucleus as electrons are being added to the same principal energy level. These electrons are gradually pulled closer to the nucleus because of its increased positive charge. Since the force of attraction between nuclei and electrons increases, the size of the atoms decreases.
Explanation:
Nuclear attractive pull to the electrons results in smaller atomic radius. Two reasons that leads the size of an atom smaller by electron loss are nuclear pulling and emptying outermost orbital.
Why atomic radius reduces by electron loss?
The nucleus have a net positive charge and electrons are negative in charge, thus, each electron experience a nuclear attractive pull. However, each electrons are shielded slightly from this attraction by the surrounding electrons.
The reasons which make the atomic radius smaller are the following.
By losing electrons the total number of electron is reducing therefore, the screening or shielding of an electron by other electron from the nuclear attractive pulling reduces, and thus due to the nuclear attraction, the orbitals shrinks inwards and reduces the atomic size. By losing electron from the outermost orbital if it contains only one electron then the orbital becomes empty and the atomic radius shrinks to the penultimate shell or orbital.
Therefore, due the two reasons mentioned above, the atomic radius reduces by electron loss.
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To make a balanced equation, 6 H2O + 6 CO2 ---> C6H12O6 + _
Answer:
6O₂
General Formulas and Concepts:
Chemistry/Biology
Photosynthesis Equation: 6H₂O + 6CO₂ → C₆H₁₂O₆ + 6O₂Explanation:
Most of the equation comes from the Photosynthesis Equation. Plants take in water and carbon dioxide and sunlight (energy) to produce glucose and oxygen. When we balance the equation and predict reaction. we should get 6O₂ as our answer.
