Answer:
MgF
Explanation:
because it has the high percent of Ionic
which statement is true about the reaction shown by this chemical equation HCl + NaOH ------> NaCl + H2O
Answer:
A. It is exothermic
Explanation:
This reaction of acid and base represents synthesis reaction because new subsatnces are produced.
What is synthesis reaction?Synthesis reactions are reactions that occur when two different atoms combines to form a different molecule. A synthesis reaction can be represented by the equation i.e. A + B → C. In this equation, the A and B represent the reactants whereas the C represents the product.
So we can conclude that option C is the correct answer which is the synthesis reaction.
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Two adaptations to plants are described below:
Adaptation 1: A hornwort is a nonflowering plant that produces a large number of spores instead of seeds.
Adaptation 2: A kangaroo paw has tiny, woolly hairs on it that help it hold onto water droplets.
Which statement is true about these adaptations?
Answer:
The answer is D
Explanation:
The hornwort is telling what that exact plant does and the kangaroo paw is telling what they do physically to hold onto water
The first adaptation is to the life cycle, and the second is to the physical traits thus, the kangaroo paw describes what they physically do to hold onto water, and the hornwort describes what that particular plant performs. So, the correct option is D.
What is Adaptation?A species or organism gradually grows more accustomed to its surroundings through the process of adaptation. The behavioral or physical characteristics of an animal that improve its ability to thrive in its ecosystem are referred to as adaptation. Animals can adapt by changing how they look to hide from predators (camouflage). To survive in their habitats, different species have evolved various adaptations.
In the above given example, the life cycle is the first adaptation, and the physical characteristics are the second. Therefore, the hornwort defines what that particular plant does, and the kangaroo paw represents what they physically do to hold onto water.
Therefore, the correct option is D.
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why is it commonly believed that carbon dioxide is responsible for global warming?
Answer:
Because of pollution and other factors that contain carbon dioxide are warm, and it heats up the air.
Explanation:
Carbon dioxide levels in the Earth's atmosphere have been steadily decreasing. Carbon dioxide has a longer average lifetime in the atmosphere. The warming effect associated with carbon dioxide has remained unchanged
The volume of a gas is 5.0L when the temperature is 5.0 degrees Celsius. If the
temperature is increased to 10.0 degrees Celsius without changing the pressure what is
the new volume?
Answer:
5.13 L
Explanation:
The volume of a gas is 5.0L when the temperature is 5.0 degrees Celsius. If the temperature is increased to 10.0 degrees Celsius without changing the pressure 10.0 L is the new volume.
What is charles's law?Charles's law states that the volume of a given amount of gas is directly proportional to its temperature on the kelvin scale when the pressure is held constant.
Given data:
[tex]V_1[/tex]= 5.0L
[tex]T_1[/tex] =5 degrees Celsius
[tex]V_2[/tex]=?
[tex]T_2[/tex]=10.0
Putting all the data in the equation:
[tex]\frac{V_1}{T_1} =\frac{V_2}{T_2}[/tex]
[tex]\frac{ 5.0L}{5.0} =\frac{V_2}{10.0}[/tex]
[tex]V_2[/tex]= 10.0 L
Hence, 10.0 L is the new volume.
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As a bond between a hydrogen atom and a
sulfur atom is formed, electrons are
A. shared to form an ionic bond
B. shared to form a covalent bond
C. transferred to form an ionic bond
D. transferred to form a covalent bond
it is b shared to form a covalent bond
Explanation:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
6. Certain materials can act as indicators because they change
a. Acidity
b. Color
c. Concentration
d. Taste
Answer:
B
Explanation:
The value of Avogadro number is
A sealed 1.0L flask is filled with 0.500 mols of I_2 and 0.500 mols of Br_2. When the container achieves equilibrium the equilibrium constant is 1.10x10^{-2}. What is the equilibrium concentration of the product, IBr?
Answer:
[IBr] = 0.049 M.
Explanation:
Hello there!
In this case, according to the balanced chemical reaction:
[tex]I_2+Br_2\rightarrow 2IBr[/tex]
It is possible to set up the following equilibrium expression:
[tex]K=\frac{[IBr]^2}{[I_2][Br_2]} =0.0110[/tex]
Whereas the the initial concentrations of both iodine and bromine are 0.50 M; and in terms of [tex]x[/tex] (reaction extent) would be:
[tex]0.0110=\frac{(2x)^2}{(0.50-x)^2}[/tex]
Which can be solved for [tex]x[/tex] to obtain two possible results:
[tex]x_1=-0.0277M\\\\x_2=0.0245M[/tex]
Whereas the correct result is 0.0245 M since negative results does not make any sense. Thus, the concentration of the product turns out:
[tex][IBr]=2x=2*0.0249M=0.049M[/tex]
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Atoms that have the same number of outer electrons
OA.
are all metallic elements.
B. must be atoms of the same element.
OC.
are all nonmetallic elements.
OD.
belong to the same family of elements.
Which of the following is converted into chemical energy during photosynthesis?
A
oxygen
B
sound energy
с
light energy
D
glucose
Crystallisation description of method
Answer:
Crystallization is a method for transforming a solution into a solid, where a supersaturated solution nucleates the solute by a chemical equilibrium controlled process. Uniform particles with well-defined morphology are formed, and these readily re-dissolve
Explanation:
Answer:
Crystallization or crystallisation is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.
why is a saturated solution of magnesium hydroxide less basic than a saturated solution of potassium hydroxide?
A.) magnesium hydroxide is less soluble than potassium hydroxide
B.) magnesium is less basic than potassium
C.) magnesium hydroxide solutions are just as basic as potassium hydroxide solutions
D.) when magnesium hydroxide dissolved the hydroxide ion is partially neutralized
Answer:
letter C I'm not sure to my answer but hope it can hrlp
The reason why magnesium hydroxide is less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.
What is a saturated solution?A saturated solution is one that contains as much solute as it can normally hold at a particular temperature.
We know that magnesium hydroxide is less soluble than potassium hydroxide. Hence, the reason why magnesium hydroxide is less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.
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how many moles of C8 H18 are present in a 546.23 gram sample?
Answer:
Given:
Compound C8H18
mass of compound- 546.23 gram
To find:
number of moles =?
Solution:
let's find out the molar mass of C8H18= 12×8+18×1 = 114 gram/mole
Number of moles= given mass/molar mass
=546.23/114
= 4.7818436487 moles.
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An alloy is an example of a
a.solid mixture but not a solution.
b.liquid solution.
c.solid solution.
d.gaseous solution.
(10pts) Post-Lab Questions Answer the following questions. (2pts) Suppose the concentration of the NaOH solution was 0.5 M instead of 0.1 M. Would this titration have required more, less, or the same amount of NaOH solution for a complete reaction? Choose... (2pts) Suppose you used 0.5 M NaOH to titrate your vinegar sample instead of 0.1 M. What effect does the concentration of base added have on the reliability of the results of your titration? Choose... (2pts) Consider a 0.238 M aqueous solution of sodium hydroxide, NaOH. How many grams of NaOH are dissolved in 23.46 mL? (2pts) How many individual hydroxide ions (OH−) are found in 23.46 mL? (2pts) How many moles of sulfuric acid, H2SO4, are neutralized by 23.46 mL of 0.238 M NaOH(aq)? [Hint: begin by writing a balanced equation for this neutralization reaction.] Total: -/28 pts
Answer:
A) Less amount of NaOH will be required
B) Reliability decreases with increase in concentration of NaOH solution
C) Mass of NaOH = 0.223 g
D) Number of hydroxide ions = 3.36 × 102²¹
E)Moles of H₂SO₄ neutralized = 0.00279 moles of H₂SO₄
Explanation:
A) Since the number of moles of acetic acid in the vinegar sample is constant, the number of moles of NaOH reacting with acetic acid is constant as well.
Volume = number of moles / concentration
Assuming, number of moles = 1, concentration = 0.1 M
Volume = 1/0.1 = 10
With increase in concentration,
Volume = 1/0.5 = 2
Therefore, less amount of NaOH will be required
B) An increase in concentration of base added will results in lesser volume of based used. This will result in an increase in percentage error as well as decrease innthe accuracy of determining the endpoint. Hence, reliability decreases
C) mass = concentration × volume × molar mass
Molar mass of NaOH = 40.0 g, volume of NaOH = 23.46 mL = 0.02346 L, concentration = 0.238 M
Mass of NaOH = 0.238 × 0.02346 × 40
Mass of NaOH = 0.223 g
D) number of moles of NaOH in 0.223 g = 0.233/40 = 0.00558 moles
1 mole of NaOH produces 1 mole of hydroxide ions; 0.00558 moles of NaOH will produce 0.00558 moles of hydroxide ions
Number of hydroxide ions in 0.00558 moles = 0.00558 × 6.02 × 10²³
Number of hydroxide ions = 3.36 × 102²¹
E) H₂SO₄ + 2 NaOH ----> Na₂SO₄ + 2 H₂O
1 mole of H₂SO₄ requires 2 moles of NaOH for complete neutralization
There are 0.00558 moles of NaOH in 23.46 mL of 0.238 M NaOH solution.
Moles of H₂SO₄ required to neutralize 0.00558 moles of NaOH = 0.00558/2
Moles of H₂SO₄ neutralized = 0.00279 moles of H₂SO₄
Identify the three basic ingredients used in glass and give an example of each
Answer:
Sand (SiO2 silica) In its pure form it exists as a polymer, (SiO2)n.
Soda ash (sodium carbonate Na2CO3) ...
Limestone (calcium carbonate or CaCo3) or dolomite (MgCO3)
Explanation:
I am pretty sure you know what sand is, Soda ash is a fine white colored powder that is extracted from the ashes of plants growing in sodium rich soils. Limestone is is a common type of carbonate sedimentary rock.
write down the sp-notation for cl-37
when silver and bromine combine, the solid silver bromide is formed. give the equation of the reaction between silver and bromine
Ag + Br2 → AgBr
balance equation
2Ag + Br2 → 2AgBr
Why do hurricanes occur near the equator and not further North? Why do they
become weaker as they hit the land?
Answer:
the occur near the equator bc its- bc its warm and they get weak bc it slows them down
Explanation:
1) How many atoms are in 0.54 moles of Cu? show work
3.3 × 10²³ atoms Cu
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
MolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 0.54 moles Cu
[Solve] atoms Cu
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 0.54 \ mol \ Cu(\frac{6.022 \cdot 10^{23} \ atoms \ Cu}{1 \ mol \ Cu})[/tex][DA] Multiply [Cancel out units]: [tex]\displaystyle 3.25188 \cdot 10^{23} \ atoms \ Cu[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
3.25188 × 10²³ atoms Cu ≈ 3.3 × 10²³ atoms Cu
The nucleus contains:
protons and electrons
protons and neutrons
electrons
protons, neutron, and electons
Explanation:
protons, neutrons and electrons
Answer:
An atom contains protons, neutrons and electrons BUT A NUCLEUS CONTAINS PROTONS AND NEUTRONS ONLY.
A machine with three pulleys uses
force to do work than a machine with four pulleys.
more
less
Solutions, _____ colloids, _____ light.
a) like, will not scatter
b) unlike, will not scatter
c) like, will scatter
d) unlike, will scatter
Answer: unlike, will not scatter
Explanation:
Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.
What is the total number of molecules of hydrogen in 0.25 mole of hydrogen?
1
6.0 10^23
2.
4.5 * 10^23
3
3.0 x 10^23
4
1.5 * 10^23
0.25 mole of hydrogen contains 1.5 * 10^23 molecules of hydrogen gas.
We have to know that the number of molecules in one mole of a substance is obtained from the Avogadro's number.
We know that;
1 mole of hydrogen contains 6.02 × 10^23 molecules of hydrogen
0.25 mole of hydrogen contains 0.25 mole × 6.02 × 10^23 molecules/1 mole
= 1.5 * 10^23 molecules
Therefore, 0.25 mole of hydrogen contains 1.5 * 10^23 molecules of hydrogen gas.
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A double replacement reaction is a reaction in which one element replaces a similar element within a compound
True
False
Answer:
False
Explanation:
. What you’re describing is a displacement reaction.
Answer:
False, that is a single replacement reaction that you have described.
Explanation:
Calculate the work done by an object that applies 20 N of force to lift a block 10 m.
Answer:
Work Done= Force×Displacement
Thus
Work Done = 20×10
Work Done = 200Joules
The mass of a brick is 5 grams. If the brick is smashed into little pieces, the total mass of all the pieces will be
5 grams
o less than 5 grams
O more than 5 grams
What will the mass be if the brick was smashed
Answer:
I am not sure but i think it is 5 grams
Explanation:
because the total mass= 5g
so it is a physical change so no new substance is formed
so the total mass = total mass of all the broken pieces
What measurement describes the pressure of gas
Answer:
a manometer
Explanation:
A manometer can be used to measure the pressure of a gas. The (difference in) height between the liquid levels (h) is a measure of the pressure. Mercury is usually used because of its large density.
seven carbon chain with CH3 attached to second and third carbon
Answer:
2,3-dimethylheptane.
CH₃ - CH - CH-CH₂-CH₂-CH₂-CH₂
| |
CH₃ CH₃
Explanation:
Hello there!
In this case, according to the given instructions, it is possible to draw the organic chemical structure by connecting seven carbon atoms along the parent chain with two methyl substituents at the second and third carbon atoms; thus, the resulting structure is:
CH₃ - CH - CH-CH₂-CH₂-CH₂-CH₂
| |
CH₃ CH₃
Furthermore, the name would be 2,3-dimethylheptane according to the IUPAC rules for nomenclature.
Best regards!
Translation is the conversion of
1 .RNA to DNA.
2. DNA to RNA.
3. DNA to protein.
4. RNA to protein.
(WILL MARK BRAINLIEST)
Translation is the conversion of RNA to protein. The conversion of RNA to DNA is called reverse transcription.
What do you mean by Proteins?Proteins may be defined as natural-appearing, extremely complex substances that consist of amino acid residues joined by peptide bonds.
The process of translation occurs in the cytoplasm of the cells, while the process of transcription occurs in the nucleus itself.
The conversion of DNA to RNA is called transcription. While the proteins are never directly converted from DNA, it involves both processes of transcription followed by the translation.
Therefore, translation is the conversion of RNA to protein.
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