Answer:
do you mean DeF?
Explanation:
Which of the following instruments is a combination of a percussion and a stringed instrument?
A) saxophone
B) piano
C) oboe
D) tambourine
Answer:B
Explanation:
NEED ASAP!!!
A rarefaction is a part of a sound wave where the particles are further apart than normal.
True
False
54.2 g N
determine the number of moles
Answer:
3.87 mol N
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
54.2 g N
Step 2: Identify Conversions
Molar Mass of N - 14.01 g/mol
Step 3: Convert
[tex]54.2 \ g \ N(\frac{1 \ mol \ N}{14.01 \ g \ N} )[/tex] = 3.86867 mol N
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
3.86867 mol N ≈ 3.87 mol N
What are two reasons that ICl has a low melting point?
Answer:
1. It is a covalent bond and all covalent bonds have low melting points
Explanation:
Molecules are related to matter because
Identify the isotope that has atoms with 28 neutrons, 23 protons, and 23 electrons
A. ^28 Ni
B. ^23 V
C. ^23 Mn
D. ^51 Sb
E. ^51 V
Answer:
E. ^51 V
Atomic number (number of protons in the nucleus): 23
Atomic symbol (on the periodic table of the elements): V
Atomic weight (average mass of the atom): 50.9415
Density: grams per cubic centimeter
Phase at room temperature: Solid
Melting point: 3,470 degrees Fahrenheit (1,910 degrees Celsius)
Boiling point: 6,165 F (3,407 C)
Number of isotopes (atoms of the same element with a different number of neutrons): 2; one stable V-51; one radioactive V-50
Most common isotopes: V-51 (99.75 percent natural abundance)
Consider the reaction between 75.5 mL of 0.247 M barium hydroxide and 95.0 mL of 0.330 M HCl. Find the mole ratio of hydrochloric acid to barium hydroxide, compare to the theoretical one, and determine the limiting reactant.
Answer:
Explanation:
Ba( OH)₂ + 2HCl = BaCl₂ + 2H₂O .
75.5 mL of 0.247 M barium hydroxide = .0755 x .247 = .01864 moles
95.0 mL of 0.330 M HCl = .095 x .33 = .03135 moles
mole ratio of hydrochloric acid to barium hydroxide
= .03135 / .01864 = 1.68
theoretical ratio = 2 /1 = 2
As the theoretical ratio is more , therefore HCl is the limiting reactant .
how do i do this question please help me
Answer:
3
Explanation:
The reaction is given as:
H₂S + O₂ → SO₂ + H₂O
Let us balance the chemical equation.
We take some letters and we use them as the coefficient to balance the equation;
aH₂S + bO₂ → cSO₂ + dH₂O
Now,
Conserving H;
2a = 2d
Conserving S;
a = c
Conserving O;
2b = 2c + d
Let a = 1, d = 1, c = 1, b = [tex]\frac{3}{2}[/tex] and multiply through by 2;
a = 2, b = 3, c = 2 and d = 2
So, the balanced reaction equation is given as;
2H₂S + 3O₂ → 2SO₂ + 2H₂O
What happens when the thermal energy of a substance increases?
Answer:
Both the motion of the particles in the substance and the temperature of the substance increase.
Answer The motion of the particles in the substance increases, and the temperature of the substance decreases.
Explanation:
water in a plate disappear after some hour when it is kept in the sun why
Answer:
This happened because of evaporation, the sun evaporated the water.
Answer:
Because if you place the plate filled with water in the sun then a small amount of water will be dried up by the sun's heat.
How to draw a covalent bonding plz help ppl
Explanation:
A single covalent bond is made up of 2 electrons (one from each atom). It is represented with a single line.
Each line is represented as one dot and one cross (. x)
A double covalent bond is made up of 4 electrons (2 from each atom). It is represented using 2 lines. As dot and cross, it will be represented with 2 dots and 2 crosses.
A triple covalent bond is made up of 6 electrons (3 from each atom). It is represented using 3 lines. As dot and cross, it will be represented with 3 dots and 3 crosses.
Know the number of electron (s) needed by the atom to have noble gas configuration / stable (Key: You should know your electron arrangement / group number / Refer to table provided)*.
Groups and the number of electrons needed for atoms to have noble gas configuration or have full outer shell(s).
Group 4: Four (4) electrons needed for the outer shell to become full / noble gas configuration;
Group 5: Three (3) electrons needed by the atom to have a full outer shell / noble gas configuration;
Group 6: Two (2) electrons needed
Group 7: One (1) electron needed
Name the 3 elements, in order, that make up a very important part of Thanksgiving. (Spell out a word with chemical symbols)
Answer:
eat well, stay well, and have fun ∛π⇅πΔΔΔ≅≅⇵↑↓∫∫↑
Explanation:
Answer:
Chemical element symbols are one- and two-letter abbreviations for the element names. They are used to make the periodic table and chemical formulas easier to read. You can combine the symbols to make words. Here is a list of English words made from periodic table element symbols. There are thousands of words that can be written using these symbols, so experiment to see if you can write your name or fun messages that show your chemistry savvy.
NEED ASAP PLS!!
What important contribution did Einstein make concerning the relationship between energy and matter?
a.) A small amount of matter can be changed into a huge amount of energy
b.) A small amount of energy is created when large amounts of matter is changed
c.) The creation of energy will result in matter
d.) Matter can never be created
Answer: It is a
Explanation:
How is cosmic microwave background radiation evidence for the Big Bang?
Answer:
In explanation,
Explanation:
Tests of Big Bang: The CMB. The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background", or CMB.
Ca(OH)2 + 2HCl → CaCl2 + 2H2O Which of the following is true about the equation
Answer:
This equation is a double reaction
Explanation:
I hope this is the answer
Answer:
ca(OH)2 is the base and CaCI2 is the salt
Explanation:
Which of the following is a INCORRECT ionic compound formula?
MgO
Na20
MgCl
NaCl
Answer:
Na2O
explanation.
Ionic bonds refers to complete transfer of electrons from one atom to another
Doing Science plz help
Answer:
My guess is b or c but its robably wrong
Explanation:
I just also need points sorry <3
2] Calculate the percentage of the element forming sugar glucose C6H1206
[C=12, H=1, 0=16]
Answer:
wouldn't it be 52
Explanation:
What is the energy (in joules) and the wavelength (in meters) of the line in the spectrum of hydrogen that represents the movement of an electron from Bohr orbit with n = 3 to the orbit with n = 5?
what is set in mathematics
Answer:
i dont get your question Man
In mathematics, a set is a well-defined collection of distinct objects
♥plz give me brain list it would really help a lot♥
♥ お力になれて、嬉しいです！♥what state of matter has more volume?
Answer:
please mark as brainliest
Explanation:
ans: Gas
The particles of matter in the gaseous state are neither close together nor fixed in place. The gas expands to fill its container. Thus, a given number of particles will have the greatest volume in the gas state.30/06/2014
explain what two-dimensional (2-D) and three-dimensional (3-D) models
are. Give an example of one you've seen recently.
Answer:
2D refers to the term “two-dimensional.”
3D refers to the term “three-dimensional.”
Explanation:
Circle, triangle, square, rectangle, and pentagon are some of the most common examples of 2D shapes.
Cylinder, pyramid, cube, and prism are some of the most common examples of 3D shapes.
What type of bond occurs between tow nonmetals.
Answer:
covalent bonds............
covalent bonds
Ionic bonds structure when a nonmetal and a steel alternate electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic enchantment between two oppositely charged ions.
when different atoms bond, the more electronegativity atom attracts electrons more strongly and acquires a slightly negative charge. true or false?
Answer:
Explanation:This unequal distribution of electrons is known as a polar covalent bond, characterized by a partial positive charge on one atom and a partial negative charge on the other. The atom that attracts the electrons more strongly acquires the partial negative charge and vice versa.
Can someone please help me!! What are the parts of a Bunsen burner if possible add a picture and name please thanks
Bunsen burner is an instrument which is used as a source of heat using natural gas or petrol. It is used for the heating, sterlization, and combustion. Bunsen burner is named after its inventor Robert bunsen.
____________________________________Mechanism:Burner provide a single, continuous flame by mixing gas with air in a controlled fashion. The ratio of gas to air that is mixed together can be manually adjusted, allowing the user to control the intensity, temperature, and size of the flame.
____________________________________PICTURE IS ATTACHED BELOW____________________________________Best Regards!'Borz'please help question is in photo will give brainiest
Answer:
D
Explanation:
Which of the following has the largest atomic radius?
Na
CI
C
Mg
Be
Answer:
Na
Explanation:
On the periodic table, the atomic radius of an atom typically decreases when going from left to right and increases when going from top to bottom.
What is the result of the process that occurs in the image?
Ionic Bonding (the transfer of valence electrons)
Answer:
Ok:
Explanation:
Sodium gives fluorine an electron. This is in part due to electronegativity differences because sodium likes to lose an electron and fluorine likes to gain. As a result, sodium and become positively charged and fluorine negatively charged. This will for electrostatic attraction and the sodium and fluorine will form a bond. This bond is called an ionic bond.
Write a balanced chemical equation for the following: magnesium metal is burned in oxygen to produce magnesium oxide.
2Mg(s)+O₂(g)⇒2MgO(s)
Further explanationEqualization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.
2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product
3. Select the coefficient of the substance with the most complex chemical formula equal to 1
Reaction(syntesis / combination)
Mg(s)+O₂(g)⇒MgO(s)
give coefficient
aMg(s)+bO₂(g)⇒MgO(s)
Mg, left=a, right 1⇒a=1
O,left=2b,right 1⇒2b=1,b=0.5
Mg(s)+0.5O₂(g)⇒MgO(s) x 2
2Mg(s)+O₂(g)⇒2MgO(s)
A measured sample of argon gas has a volume of 20.0 L at a pressure of 660 mm Hg. What is the final volume
if the pressure is decreased to 550 mmHg?
O A. 5.5 L
O B. 17 L
OC. 24 L
OD. 240 L
Answer:
C . 24 L
Explanation:
Given data:
Initial volume of gas = 20.0 L
Initial pressure of gas = 660 mmHg
Final volume = ?
Final pressure = 550 mmHg
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
660 mmHg × 20.0 L = 550 mmHg × V₂
V₂ = 13200 mmHg. L/ 550 mmHg
V₂ = 24 L