Answer:
See explanation
Explanation:
From left to right, the oxides across period 3;
i) Period 3 oxides all appear white in colour. They are all crystalline solids and their melting points decrease from left to right.
ii) The volatility of period 3 oxides increases from left to right across the periodic table
iii) The metallic oxides on the right hand side adopt giant ionic structures. Silicon oxide which is in the middle of the period forms a giant covalent structure. Oxides of other elements towards the right hand side form molecular oxide structures.
iv) The acidity of oxides of period 3 increases from left to right. Metals on the left hand side form basic oxides while non-metals on the right hand side form acidic oxides. The oxide of aluminium in the middle is amphoteric.
v) The oxides of period 3 elements do not conduct electricity. However, the metallic oxides on the lefthand side conduct electricity in molten state. The non-metallic oxides on the right hand side are molecular hence they do not conduct electricity under any circumstance.
What is the molarity of a solution that contains 45 mEq Ca“ per liter?
Answer:
0.0225 M
Explanation:
In one liter of this solution, there are 45 mEq of Ca⁺².
1 mEq of Ca⁺² is equal to 20 mg of Ca⁺. We know this by dividing its molar mass (40) by the charge of the ion (2).
Meaning that 45 mEq of Ca⁺² is equal to (45 * 20) 900 mg of Ca⁺².
Now we convert 900 mg of Ca⁺² into moles, using its molar mass:
900 mg / 1000 = 0.9 g0.9 g Ca⁺² ÷ 40 g/mol = 0.0225 mol Ca⁺²Finally we calculate the molarity of the solution:
Molarity = moles / liters0.0225 mol / 1 L = 0.0225 MWhat is the definition of a Lewis acid?
A. A Lewis acid accepts an electron pair from a base.
B. A Lewis acid donates a proton to the solution.
C. A Lewis acid accepts a hydroxide from the solution.
D. A Lewis acid donates an electron pair to a base.
Answer:
A. A Lewis acid accepts an electron pair from a base
Explanation:
PLATO
The definition of a Lewis acid is that a Lewis acid accepts an electron pair from a base.
What is a base?
According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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PLEASE HELP
Solids that do not form a crystalline structure are called.......
I don't remember what they are called
For the reaction
C2H4(g) + 302(g) → 2002 (g) + 2H20 (8)
if 6.0 mol of CO2 are produced, how many moles of Oz were reacted?
4.0 mol
0 7.5 mol
9.0 mol
o none of these
O 15 mol
Answer:
9.0 mol
Explanation:
C₂H₄(g) + 3O₂(g) → 2CO₂ (g) + 2H₂O (g)In order to convert from moles of CO₂ to moles of O₂, we need to use the stoichiometric coefficients in the balanced reaction. We use a conversion factor that has moles of CO₂ in the denominator and moles of O₂ in the numerator:
6.0 mol CO₂ * [tex]\frac{3molO_2}{2molCO_2}[/tex] = 9.0 mol O₂vitamin can act like some thing what are those thing and how?
Answer:
Some nutrients also act as antioxidants. These may be vitamins, minerals, proteins, or other types of molecules. They help the body remove toxic substances known as free radicals, or reactive oxygen species. If too many of these substances remain in the body, cell damage and disease can result.
4. Why does iron corrode faster in salt water?
~My Answer~:
Water is the enabler of fast oxidation of iron so freshwater will also cause rust. However, salt water is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water.
CS2(g) + 3 O2(g) → CO2(g) + 2 SO2(9)
16. CS2 reacts with O, to produce CO2 gas and SO, gas as shown above. Identify the limiting reactant
when 192 g O, is added to 4.50 mol CS2
A CS2
B. O2
C.CO2
D. SO
In terms of activation energy, why does increasing the temperature of a
reaction make it proceed more quickly?
A. Increasing the temperature reduces the activation energy.
B. Increasing the temperature increases the potential energy of the
reactants.
O C. Increasing the temperature increases how many reactant
molecules reach activation energy.
D. Increasing the temperature makes the molecules move slower.
Increasing the temperature increases the potential energy of the reactants, thus making the reaction faster.
What is activation energy?Activation energy is the minimum energy that reactant molecules must possess in order to collide together to form products.
Increasing the temperature of a reaction helped to make the reaction proceed faster. This is because more reactant particles acquire the energy greater than or equal to the activation energy.
Therefore, increasing the temperature of a reaction makes it proceed more quickly.
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8. The protein in a 1.2846-g sample of an oat cereal is determined by a Kjeldahl analysis. The sample is digested with H2SO4, the resulting solution made basic with NaOH, and the NH3 distilled into 50.00 mL of 0.09552 M HCl. The excess HCl is back titrated using 37.84 mL of 0.05992 M NaOH. Given that the proteins in grains average 17.54% w/w N, report the %w/w protein in the sample.
Answer: The %w/w protein in the sample is 15.2 %
Explanation:
To calculate the number of moles for given molarity, we use the equation:
[tex]\text{Moles of solute}={\text{Molarity of the solution}}\times{\text{Volume of solution (in L)}}[/tex]
[tex]\text{Moles of} HCl={0.09552\times 50.00}{1000}=0.0047moles[/tex]
[tex]\text{Moles of} NaOH={0.05992\times 37.84}{1000}=0.0023moles[/tex]
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
According to stoichiometry :
1 mole of [tex]NaOH[/tex] require 1 mole of [tex]HCl[/tex]
Thus 0.0023 moles of [tex]NaOH[/tex] will require=[tex]\frac{1}{1}\times 0.0023=0.0023moles[/tex] of [tex]HCl[/tex]
moles of HCl used = (0.0047-0.0023) = 0.0024
[tex]NH_3+HCl\rightarrow NH_4Cl[/tex]
1 mole of HCl uses = 1 mole of ammonia
Thus 0.0024 moles uses = [tex]\frac{1}{1}\times 0.0024=0.0024moles[/tex] of ammonia
Mass of ammonia= [tex]moles\times {\text {Molar mass}}=0.0024\times 17g/mol=0.0408g[/tex]
17 g of ammonia contains = 14 g of Nitrogen
Thus 0.0408 g of ammonia contains = [tex]\frac{14}{17}\times 0.0408=0.034 g[/tex] of Nitrogen
Now 17.45 g of Nitrogen is present in = 100 g of protein
Thus 0.034 g of Nitrogen is present in =[tex]\frac{100}{17.45}\times 0.034=0.195g[/tex] of protein
Now % w/w of protein = [tex]\frac{0.195}{1.2846}\times 100=15.2\%[/tex]
Thus %w/w protein in the sample is 15.2%
If the proteins in grains average 17.54% w/w N, the % w/w protein in the sample is 15.2 %.
What is Kjeldahl analysis?It is a process of converting nitrogen present in any compound into ammonium sulfate.
Step1: calculating the moles by the formula of molarity
molarity × volume
M = 0.09552, V = 50.00 mL =0.05 L
Moles of HCl
[tex]0.09552 \times 0.05 = 0.0047\;mol\\[/tex]
Moles of NaOH
[tex]0.05992 \times 0.03784 = 0.0023 \;mol[/tex]
Moles of HCl used is 0.0047 - 0.0023 = 0.0024
Step2: calculating the mass of ammonia
moles × molar mass
[tex]0.024 \times 17\;g/mol = 0.0408\;g[/tex]
Now, 17 grams of ammonia have 14 grams of nitrogen
so, 0.0408 g ammonia have [tex]\dfrac{14}{17} \times 0.0408 = 0.034[/tex]
In 100 g of protein, there is 17.45 g of nitrogen
So, 0.034 g N have [tex]\dfrac{100}{17.45} \times 0.034 = 0.195 g.\\[/tex]
Step3: calculating the % w/w
[tex]\dfrac{0.195}{1.2846} \times 100 = 15.2 \%[/tex]
Thus, the % w/w is 15.2 %
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The physical properties of element X are shown in the table below.
Physical Properties of X
malleable
ductile
shiny
conducts heat
conducts electricity
Which most likely represents the identity of element X?
O A. iodine (1)
OB. sulfur (S)
OC. copper (Cu)
OD. carbon (C)
Answer:
Copper
because it is metal and all the above property
matches with copper properties
so answer of this question is copper
how many grams of oxygen gas are there in a 2.3 L tank at 7.5 atm and 24 C
Answer:
22.6 g
Explanation:
First we use the PV=nRT equation:
P = 7.5 atmV = 2.3 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 24 °C ⇒ 24 + 273.16 = 297.16 KWe input the data:
7.5 atm * 2.3 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 297.16 KAnd solve for n:
n = 0.708 molThen we convert 0.708 moles of oxygen gas (O₂) to grams, using its molar mass:
0.708 mol * 32 g/mol = 22.6 gdirects all of the cell's activities.
a Endoplasmic Reticulum
b cell membrane
c Nucleus
d cytoplasma
What kind of elements separate the metals from the nonmetals on the periodic table of elements?
Answer: Metalloids
Explanation:
The dark “stair step” line on the right side of the periodic table is where the metalloids are. Metalloids “touch” the SSL. (Stair step line)
The metals are to the left of the SSL and the non metals are to the right of the SSL.
PLS HELP ASAP. *IF* THE ANSWER IS CORRECT I'LL MARK YOU AS BRAINIEST:
Which is an example of mechanical weathering?
a) iron oxide
b) water moving over rocks
c) limestone cave formations
d) hydrated minerals
Answer: C: limestone cave formations
2. Which of the following are reactants of photosynthesis? *
a. carbon dioxide, water and light energy
b. glucose and oxygen
c. carbon dioxide, water and ATP
d. carbon dioxide, glucose and light energy
Answer:
A is the answer.
Is grilling a ham and cheese sandwich and chemical or physical change?
Answer:
Physical
Explanation:
I say physical because if you just think about the cheese it wasnt melted before u put that heat on it .
In the Determination of an Equilibrium Constant lab, you will react acetic acid with ethanol in the presence of sulfuric acid until equilibrium is established. Then, you will titrate the equilibrium mixture with NaOH to determine the acetic acid concentration. Suppose you determine that the added sulfuric acid requires 2.97 mL of NaOH to be neutralized in a blank solution. The equilibrium mixture requires 12.92 mL of NaOH to reach the endpoint. What volume of NaOH should you use to calculate the acetic acid concentration at equilibrium
Answer:
9.95mL is the volume of NaOH that you must use
Explanation:
In the problem, you have in your blanck the presence of an acid as sulfuric acid. That means the blank requires an amount of NaOH to neutraliz its solution.
The volume required for the sample will be:
Volume of the sample - Volume of the blank
Beacuse we don't have to take into account the acidity of the blanck
12.92mL - 2.97mL =
9.95mL is the volume of NaOH that you must useOrganelles carry out specif functions within the cell. True False
Answer:
true
Explanation:
Pretty easy question if you know science. 20 Points
A piece of nickel at 25 °C is dropped into a glass of water at 25 °C. Which statement is correct?
Heat will flow from the nickel to the water in the glass.
Heat will flow from the water in the glass to the nickel.
There will be no transfer of heat from the nickel to the water in the glass.
The final temperature of water and nickel will be 0 °C.
Answer:
C.
Explanation:
because the heat From the nickel and the heat from the water are the same.
As a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there will be no transfer of heat from the nickel to the water in the glass.
To answer the question, we need to know what heat transfer is.
What is heat transfer?This is the flow of heat energy from one body to another over a temperature gradient.
Heat transfer between Nickel at 25 °C and water at 25 °C.
Since a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there is no temperature gradient, since, both bodies are at the same temperature. Thus, no heat is transferred from the nickel to the water.
So, as a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there will be no transfer of heat from the nickel to the water in the glass.
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Meredith mixes together 5 grams of baking soda and 5 grams of vinegar in a test tube that is not sealed. She then weighs the product and
finds that it weighs 9 grams. Mathew conducts the same experiment, except in a sealed bag. He finds that 5 grams of baking soda and 5
grams of vinegar will result in 10 grams of product. Which of the following might account for their different findings?
O A. Some of the mass was created during the reaction between vinegar and baking soda in the bag.
OB. Some of the mass of the reactants was converted to light.
O C. Some of the mass escaped from the test tube as a gas before it was massed.
OD. Some of the mass from the test tube was destroyed.
Answer:
simple chemistry experiment—adding baking soda to vinegar—seems to challenge the law of conservation of mass.
Some of the mass escaped from the test tube as a gas before it was massed. Hence option C is correct.
What is experiment?Experiment is defined as a process used to confirm or deny a hypothesis, as well as assess the likelihood or effectiveness of a previously untested idea. Additionally, experiments are used by researchers to confirm or refute new or current theories. The structure or mathematical form of a theory can be hinted at by an experiment, and it can also provide proof that the entities involved in our theories actually exist.
Something new is created when vinegar and baking soda are combined. Carbon dioxide gas soon foams up in the mixture. All of the baking soda can be made to react and dissolve into the vinegar solution if enough vinegar is utilized.
Thus, some of the mass escaped from the test tube as a gas before it was massed. Hence option C is correct.
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The diagram below represents H2 and Cl2 molecules that will potentially react to form HCI.
Hydrogen
Chlorine
Which of the following best describes this reaction?
А
The limiting reactant is chlorine.
B
The percent yield will be greater than 100%.
с
Hydrogen and chlorine are nonreactive.
D
All molecules shown will react to form the product.
The limiting reactant is chlorine in the given reaction of hydrogen and chlorine. Therefore, the correct option is option A.
What is chemical reaction?A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Chemical atom bonds are formed and broken during chemical reactions, which traditionally only involve changes in the locations of electrons.
The study of chemical processes involving unstable and radioactive materials, where both electronic or nuclear changes may take place, is known as nuclear chemistry. The limiting reactant is chlorine in the given reaction of hydrogen and chlorine.
Therefore, the correct option is option A.
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4 points
1. What is the main source of energy for this food chain? *
Sun
Plants
Fish
Turtles
Sharks
O fish
O turtle
sun
O shark
Answer:
sun
Explanation:
all of the other things get their energy from the Sun
Answer:
sun
Explanation:
the sun is the main source of energy for plants, which are at the bottom of the food chain.
Which is an advantage of selling plant fertilizer as a powder rather than as a liquid?
Choose one.
A. The powder must be stored in a childproof container.
B.Transportation costs are reduced.
C.The powder may be a health hazard if proper procedures are not followed during mixing.
D.The gardener has to be able to read directions carefully and mix the proper amount of solvent and solute.
Answer:A
Explanation: because i saw the sheet
What is the molar mass of (NH4)2 CO3
i need help can someone help. pls
Write a balanced chemical equation, complete ionic equation and a net ionic equation for Copper lll sulfate and zinc.
Answer: CuSO4 (aq)+ Zn (s) → Cu (s) + ZnSO4(aq)
Explanation: do you mean copper II sulphate CuSO4?
PLEASE HELP ME!!
CHEMISTRY DIMENSIONAL ANALYSIS SUPER EASY!!
WILL GIVE BRAINLIEST TO THE !!*CORRECT ANSWER*!!
The density of chocolate is 1.325 g/cm^3. How many cups would 20,000 mg of chocolate be?
Answer:
Cup of volume [tex]0.0675[/tex] cubic centimeter is required
Explanation:
Given
Density of the Cup [tex]= 1.325[/tex] g/cm^3
Total weight of the chocolates [tex]= 20,000[/tex] mg or 20 grams
Density is equal to mass divided by volume
Volume of the chocolates
[tex]\frac{1.325}{20} \\= 0.0675[/tex] cubic centimeter
How does light travel through a solid, liquid, gas, and a vacuum?
Light travels in a straight line as a wave. It does not require any medium or material to travel like sound waves which means it can travel in vacuum.The speed of the light from the special theory of relativity is a constant value of 38x10^8m/second
Not sure if my answers are even correct. i am so confused
Answer:
#3 is the percentage for sodium i believe and 4 is right
Explanation:
Two people are pushing a couch from opposite sides. One person is pushing to the right with a force of N. The other person is pushing to the lell William
4 N. Which of the following best describes the movement of the couch?
A. The couch will move to the left with a force of IN
B. The couch will not move.
C. The couch will move to the right with a force of 7 N
D. The couch will move to the left with a force of 7N
Answer:
The couch will not move because the people are not working together. Maybe if they call someone to help they can make some progress.