1. What fraction of the elements on the periodic table are metals?
Answer:
About 80% of the elements on the periodic table are metals.
Explanation:
Explain how some salt solutions can be heavy and some light if they are made
with the same materials.
Answer:??????
Explanation:
This table shows the mass and volume of four different objects.
A two-column table with 4 rows. The first column titled objects has entries W, X, Y, Z. The second column titled Measurements has entries Mass: 16 grams Volume: 84 centimeters cubed in the first cell, Mass: 12 grams Volume: 5 centimeters cubed in the second cell, Mass: 4 grams Volume: 6 centimeters cubed in the third cell, Mass: 408 grams Volume: 216 centimeters cubed in the fourth cell.
Which ranks the objects from most to least dense?
X, Y, W, Z
X, Z, Y, W
W, Y, Z, X
Z, Y, X, W
Answer:
x, y, w, z
Explanation:
hope it’s right, but i think it is :)
Answer:
x y w z
Explanation:
Using a triple beam balance and a graduated cylinder, a student collected data on a sample of an element:Mass of sample = 18.9 gVolume of water = 30.0 mLVolume of water and sample = 35.0 mL..... using SigFig Rules *
The question is incomplete; the complete question is;
Using a triple beam balance and a graduated cylinder, a student collected data on a sample of an element:
Mass of sample = 18.9 g
Volume of water = 30.0 mL
Volume of water and sample = 35.0 mL
Calculate the density of the sample using sig figs.
Answer:
3.8 g/mL
Explanation:
Mass of sample = 18.9 g
Volume of water = 30.0 mL
Volume of water and sample = 35.0 mL
Volume of the sample = 35.0 mL – 30.0 mL = 5.0 mL
D = m/v
D = 18.9 g / 5.0 mL =3.8 g/mL
how many atoms it would take to make up the thickness of a banknote.
Answer:
Since one banknote has a thickness of about 0.1 millimeters, if all the banknotes produced in a year were stacked up, they would reach a height of approximately 300 kilometers, which is about 80 times the height of Mount Fuji.
3.2.2 Discuss TWO ways n which it can raise awareness
[tex]\huge\frak\red{Answer}[/tex]
[tex]\small\mathbb\green{they \: are \: two \: types \: of \: raise \: awareness}[/tex]
1) Throw an Event
2) Amp up Social Media
_____________________________________________
[tex]\small\mathbb\orange{hope \: it's \: helpful \: to \: you}[/tex]
Data for CH3COOH(l) + C2H5OH(l) CH3COOC2H5(l) + H2O(l) balance were obtained at 100. The initial concentrations of the reagents are indicated in columns 1 and 2 of the table below and the CH3COOC2H5 concentrations in equilibrium are given in column 3. Calculate H2O and determine the value of KC
Answer:
Kc = 3.94
Explanation:
CH₃COOH(g) + C₂H₅OH(g) → CH₃COOC₂H₅(g) + H₂O(g)
Liquids aren't included in the equilibrium constant, but at 100°C, all four compounds are a gas. So the equilibrium equation is:
Kc = [CH₃COOC₂H₅] [H₂O] / ([CH₃COOH] [C₂H₅OH])
Set up an ICE table for each row and calculate the value of Kc. Then average the results. (See picture.)
Kc ≈ (3.919 + 4.012 + 3.902) / 3
Kc ≈ 3.94
10.What is the name of the smallest atom?
Answer:
The name of the smallest atom is Hydrogen
Explanation:
It's the first atom in the periodic table, meaning it has the least protons or electrions, I forgot.
Complete orbital diagrams (boxes with arrows in them) to represent the electron configuration of valence electrons of carbon before and after sp hybridization.
Answer:
Explanation:
Before Hybridization => C: 1s² ⇵ 2s²⇵ 2p₋₁↑ 2p₀↑ 2p₊₁∅
After Hybridization => C: 1s² 2sp¹ 2sp¹ 2p₀¹2p₊₁¹ => 2 hybrid orbitals and 2 unhybridized p-orbitals at the n=2 energy level.
how many grams of Br2 are needed to completely convert 15.0g Al to Albr3?
Answer:
For, this question,
The balanced equation is; 2Al + 3 ----> 2Al
We can now, calculate how many grams of will be needed to completely convert 15 g of Al into Al.
Here, the reaction produces, 2 moles of Al
So, For 15.0 g of Al; we can calculate;
(15.0 g Al) X (1 mole Al / 26.98 g Al) X (3 moles / 2 moles Al) X (159.81 g / 1 mole )
= 133 g of will be needed.
Therefore, 133g of will be needed to completely convert 15 g of Al into Al.
Explanation:
Which severe weather event is most likely to occur when glaciers melt at a faster than usual rate?
A. Floods
B. Hurricane
C. lighting
D. winter weather
Answer:
A -floods
Explanation:
When the Glaciers melt it causes water
What is the first organic compound prepared in laboratory?
What is the first organic compound prepared in laboratory?
➪ Urea was the first organic compound which was synthesised from inorganic chemicals. Fredrich Wohler is known for the synthesis of Urea. He formed the compound with ammonium cyanate, an inorganic salt.
Answer:
Urea
Explanation:
The credit of invention goes to Fredrick wohler .He synthesized ammonium cyanate to Urea .It drawbacked the theory organic compounds can't be prepared artificially
K2S and NaOH are soluble in water or not? Explain.
Answer:
Explanation:
Is k2s a soluble in water?
Potassium Sulfide is a moderately water and acid soluble Potassium source for uses compatible with sulfates.
odium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na⁺ and hydroxide anions OH⁻ .
Please Help!!
A researcher takes a 10 mL sample of HCl from a bottle and titrates it with NaOH. It was found that 22.4 mL of 0.25 M NaOH were required to reach the equivalence point. What is the concentration of the HCl in original bottle?
Answer : The concentration of the HCl in original bottle is 0.56 M.
Explanation :
According to neutralization law:
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = concentration of HCl
[tex]M_2[/tex] = concentration of NaOH
[tex]V_1[/tex] = volume of HCl
[tex]V_2[/tex] = volume of NaOH
Given:
[tex]M_1[/tex] = ?
[tex]M_2[/tex] = 0.25 M
[tex]V_1[/tex] = 10 mL
[tex]V_2[/tex] = 22.4 mL
Now put all the given values in the above formula, we get:
[tex]M_1\times 10mL=0.25M\times 22.4mL[/tex]
[tex]M_1=0.56M[/tex]
Therefore, the concentration of the HCl in original bottle is 0.56 M.
What two factors affect the rate of acceleration of an object?
O force and distance
mass and weight
O force and mass
Answer:
force and mass
Explanation:
Show the formation of Calcium chloride by the transfer of electrons
Answer:
CaCl,2
the 2 goes to the bottom right side
Determine the length of the object shown.
5.6 cm
5.60 cm
5.600 cm
6 cm
Answer: The length of the object is 5.6 cm.
Explanation:
The enthalpy of solution (∆H) of NaNO₃ is 20.4 kJ/mol. If 6.10 g NaNO₃ is dissolved in enough water to make a 100.0 mL solution, what is the change in temperature (°C) of the solution? (The specific heat capacity of the solution is 4.184 J/g･°C and the density of the solution is 1.02 g/mL)
The enthalpy of solution is the heat evolved or absorbed in solution. From the calculations performed, the enthalpy of solution is 3.2°C.
What is is heat of solution?The term heat of solution refers to the heat evolved or absorbed when a substance is dissolved in water.
Number of moles of NaNO3 = 6.10 g/85 g/mol = 0.07 moles
Heat absorbed = 20.4 kJ/mol * 0.07 moles = 1.43 kJ
Mass of solution = 1.02 g/mL * 100 mL = 102 g
Mass of system = 102 g + 6.10 g = 108.1 g
Heat capacity of solution = 4.184 J/g･°C
From;
H = mcdT
1.43 * 10^3 J = 108.1 g * 4.184 J/g･°C * dT
dT = 1.43 * 10^3 J/108.1 g * 4.184 J/g･°C
dT = 3.2°C
Learn more about enthalpy of solution: https://brainly.com/question/4768494?
what is the structure and function of carbohydrates
Answer:
Monosaccharides. Carbohydrates are the most abundant biomolecule on Earth. Living organisms use carbohydrates as accessible energy to fuel cellular reactions and for structural support inside cell walls. Cells attach carbohydrate molecules to proteins and lipids, modifying structures to enhance functionality.
Explanation:
Which object would likely have the least amount of wasted energy?
a hairdryer
a solar cell
a car engine
a hydroelectric dam
Answer:
The answer is solar cell.
Explanation:
It’s the smallest of the 4 choices, the smaller it is the less it wastes.
Answer:
Explanation:
solar cell
What is the most common isotope of Titanium?
The correct answer would be 48 Ti
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Answer:
same bud same
Explanation:
tttt5566555tggf and I don't
Sodium 24 has a half life of 15 hours , how many hours is three half lives
Answer:
Explanation:
So, Total amount of time = 3 × ( Half - life of Sodium - 24 ) = (3 × 15 h) (3 × 15 h) = 45 h. So, 45 h is three half - lives .
compare and contrast elements and compunds
Answer:
The similarity is that Elements and Compunds exist in stable form because of the bonds formed between their atoms. The difference is that an element is a material that consists of a single type of atom and a compound consists of two or more types of elements held together by covalent or ionic bonds.
Explanation: Google
Which of the following is an example of hydrogen bonding?
Answer:
water H2O
Explanation:
Give reasons for the following:
1-The nuclear fuel that is used in a nuclear reactor should contain 92u235
2-enzymes are very important compounds
Please give a class 11-12 level explanation thank you
Answer:
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C + H2O → CO + H2
What is the starting substance?
Answer:
Explanation:
Carbon and water = carbon dioxide and hydrogen
Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the diagram. If an item describes more than one category, be sure to place it in the overlapping space.
A Venn Diagram is a graphical tool that provides information about the relationship between things.
What is Venn Diagram?A Venn Diagram is a graphical illustration using circles to show the relationship between two or more things.
In a Venn Diagram, the items that two things share in common are represented by a region in which the two things intersect.
The items that are exclusive to each thing is shown in regions where the circles are separate.
Thus, a Venn Diagram provides information about the relationship between things.
Learn more about Venn Diagram at: https://brainly.com/question/1024798
Family number in science
If 8.500 g of sodium nitrate and 7.500 g of potassium chloride are dissolved in 25.0 mL of water and heated to 80°C no solid Watermain. Using these amounts of potassium chloride and sodium nitrate, calculate the theoretical number of grams of sodium chloride and potassium nitrate that could be formed.
Answer:
Zero grams of NaCl & KNO₃ ... The reagents mixed in aqueous solution would not produce products as no driving force is present; i.e., no precipitate, weak electrolyte or gas decomposition product will form.
Explanation:
NaNO₃(aq) + KCl(aq) => (theoritically) NaCl(aq) + KNO₃(aq)
However all chloride salts from metathesis rxns remain soluble and 100% ionized except for halide derivatives of Hg⁺², Ag⁺ & Pb⁺₂. Further, all NO₃⁻ salt derivatives also remain soluble and 100% ionized.
Technically, metathesis reactions (also known as double replacement rxns) depend upon the formation of a 'driving force' that leaves the reaction system in the form of a precipitate, weak electrolyte (weak acid or weak base) or a gas decomposition product. So, the reaction in this case should be as follows:
NaNO₃(aq) + KCl(aq) => No Reaction