Metals- • Lustrous (shiny)
• Good conductors of heat and electricity.
• High melting point.
• High density (heavy for their size)
• Malleable (can be hammered)
• Ductile (can be drawn into wires)
• Usually solid at room temperature (an exception is mercury)
• Opaque as a thin sheet (can't see through metals)
Non-metal- • High ionization energies.
• High electronegativities.
• Poor thermal conductors.
• Poor electrical conductors.
• Brittle solids—not malleable or ductile.
• Little or no metallic luster.
• Gain electrons easily.
• Dull, not metallic-shiny, although they may be colorful.
Metalloid-Are generally solids
Can be shiny or dull (luster)May or may not be drawn into wire (ductile)May or may not be hammered flat (malleable)May or may not be brittleConduct heat and electricity better than nonmetals, but not as well as metals Tend to make good semiconductorsHave boiling points that are widely variedHave melting points that are widely variedHave densities that are widely variedMetals are lustrous, malleable, ductile, good conductors of heat and electricity,Non-metals are brittle, dull, and poor conductors of heat and electricity,Metalloids they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.
What are Metal,Non-metal and Metalloids?Metals are generally shiny, malleable, and hard. Metals are also good conductors of electricity.Non-metals do not conduct heat or electricity very well. Metalloids share characteristics of both metals and non-metals and are also called semimetals.Metals are lustrous, malleable, ductile, good conductors of heat and electricity,Non-metals are brittle, dull, and poor conductors of heat and electricity,Metalloids they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.
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HELP ASAP! GIVING BRAINLIEST!!
Think about the process of raising a pendulum to one side and letting it go. For this event, create a list associated with the pendulum as it cycles from the choices below:
KINETIC ENERGY FORMS:
- Motion energy
- Thermal energy
- Electric energy
- Vibrational energy
- Radiant energy
POTENTIAL ENERGY FORMS:
- Gravitational Potential energy
- Elastic Potential energy
- Chemical Potential energy
- Electric Potential energy
- Magnetic Potential Energy
- Nuclear Potential energy
Answer:
impossible
Explanation:
Answer:
Kinetic energy
Potential energy
Motion energy
what is mascara made out of?
Answer: most contain the same basic components of pigments, oils, waxes, and preservatives.
Explanation: YOOOO was up :))))))
What is the change in atomic mass when an atom emits a beta particle? Please explain your answer
no significant change
decreases by 2
decreases by 1
increases by 1
no significant change
Explanation:
When an atom emits a beta particle, a neutron is changed into a proton by emitting an electron. The electron has a negligible mass (very small), hence there is no significant change in atomic mass.
How is acid rain produced ?
Answer:
acid rain is produced from harmful emissions in the air clinging to the water molecules and coming down as rain
Explanation:
The type of acid rain that contains water is called wet deposition. Acid rain formed with dust or gasses is called dry deposition.
which of the following describes the movements of electrons
Answer:
What are the options?
Explanation:
I'll need to know the options in order to answer that.
A drum Can begin to vibrate at its natural frequency without being struck through:
A. Refection
B.diffraction
C.refraction
D. Resonance
Answer IS D!!
Answer:
[tex]\boxed{\text{D. Resonance}}[/tex]
Explanation:
If an external vibration matches the drum's natural frequency, it will induce the can to vibrate. This is an example of resonance.
It is analogous to pumping your legs in synchronization with a swing's natural frequency.
convert 6.35 grams of aluminum sulfate to moles
Answer:
There are 0.0186 moles of formula units in 6.35 grams of aluminum sulfate [tex]\rm Al_2(SO_4)_3[/tex].
Explanation:
What's the empirical formula of aluminum sulfate?
Sulfate is an anion with a charge of -2 per ion. When sulfate ions are bonded to metals, the compound is likely ionic.
Aluminum is a group III metal. Its ions tend to carry a charge of +3 per ion.
The empirical formula of an ionic compound shall balance the charge on ions with as few ions as possible.
The least common multiple of 2 and 3 is 6. That is:
Three sulfate ions [tex]\rm {SO_4}^{2-}[/tex] will give a charge of -6. Two aluminum ions [tex]\rm Al^{3+}[/tex] will give a charge of +6.Pairing three [tex]\rm {SO_4}^{2-}[/tex] ions with two [tex]\rm Al^{3+}[/tex] will balance the charge. Hence the empirical formula: [tex]\rm Al_2(SO_4)_3[/tex].
What's the mass of one mole of aluminum sulfate? In other words, what's the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]?
Refer to a modern periodic table for relative atomic mass data:
Al: 26.982;S: 32.06;O: 15.999.There are
two Al, three S, andtwelve Oin one formula unit of [tex]\rm Al_2(SO_4)_3[/tex].
Hence the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]:
[tex]\underbrace{2\times 26.982}_{\rm Al} + \underbrace{3\times 32.06}_{\rm S} + \underbrace{12\times 15.999}_{\rm O} = \rm 342.132\;g\cdot mol^{-1}[/tex].
How many moles of formula units in 6.35 grams of [tex]\rm Al_2(SO_4)_3[/tex]?
[tex]\displaystyle n = \frac{m}{M} = \rm \frac{6.35\;g}{342.132\;g\cdot mol^{-1}} = 0.0186\;mol[/tex].
Among the four ecosystems, is the most diverse. In the second ecosystem, there are 4 species of producers, 8 primary consumers, 10 secondary consumers, and 10 tertiary consumers. If the number of species of primary consumers in the second ecosystem increases to 20, there will be .
Species will be four secondary and tertiary consumers will be 25
Explanation-
Given in the question the number of species is 4 then it will have 8 primary 10 secondary and 10 tertiary consumers. If this number of primary consumers increases from 8 to 20 consumers then the number of species involved would be 10 { 4x20/8 }
Number of secondary consumers would also be increased and increased value would be 25 { 10x20/8 } then again comes the tertiary number of consumer which also increases. The number of tertiary consumers will increase to 25 { 10x20/8} same as secondary.
Among the four ecosystems, ecosytem 3 is the most diverse. In the second ecosystem, there are 4 species of producers, 8 primary consumers, 10 secondary consumers, and 10 tertiary consumers. If the number of species of primary consumers in the second ecosystem increases to 20, there will be fewer producers in the ecosystem.
A scientist has three liquids in a beaker. Liquid 1 is the top layer, liquid 2 is the middle layer, and liquid 3 is the bottom layer. Write the order of the liquids from most dense to least dense.
Answer:
3>2>1
Explanation:
Liquid 3 is the densest and liquid 1 is the least dense of all. Liquid 2 would be in the middle as its density lies between that of liquids 1 and 3.
Density can be defined as the mass per unit volume of a liquid.
The more the mass the greater the density. Density increases with increasing mass of solute. We see that density shares a direct proportionality with mass.
In terms of volume, the more the volume of solvents the lesser the density. When we dilute some solutions, we tend to reduce their density. Density shares an inverse relationship with volume.
The densest solutions would go below while the least dense goes up.
Which is a sustainable practice? A. Wind farms B. Clear cutting C. Flood irrigation D. Overfishing
When a practice is sustainable, it means that it can be used over and over through time. Sustainable practices also benefit, rather than harm, the environment. Though it really depends on where you live, the general answer for this would be wind farms since flood irrigation can only happen in certain conditions. Overfishing would destroy a species over time, and clear cutting is obviously harmful to the environment.
The sustainable practice can be described as one that can be seen in A. Wind farms . option A is correct.
What is sustainable practice?It has the capacity to be maintained, upheld, or affirmed. Science of the environment. the property of not being environmentally destructive or depleting natural resources, promoting long-term ecological balance: The committee is creating sustainability criteria for energy-using products.
Sustainable practices promote the health and vitality of the environment, people, and the economy. According to sustainability, resources are limited and should be used prudently with an eye toward long-term goals and the effects of how they are used.
Hence , option A is correct.
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How are the colors in neon signs changed?
Answer:
Neon lights don't actually change colors.
Explanation:
Neon signs give the illusion of changing color by turning different components of the signs on or off.
Answer:
The color of the light depends on the gas in the tube. Neon lights were named for neon, a noble gas which gives off a popular orange light, but other gases and chemicals are used to produce other colors, such as hydrogen (red), helium (yellow), carbon dioxide (white), and mercury (blue).
Explanation:
those are all the color signs i know this because i did it before
Latoya performs an experiment using the lab equipment shown. Which two properties is Latoya most likely measuring?
Answer: Volume and temperature
Explanation:
Answer:
volume and temperature
Explanation:
A sample of gas in a balloon has an initial temperature of 20. ∘C and a volume of 1.92×103 L . If the temperature changes to 68 ∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?
Answer:
[tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex]
Explanation:
The pressure is constant, so we can use Charles' Law.
[tex]\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}[/tex]
Data:
V₁ = 1.92 × 10³ L; T₁ = 20 °C
V₂ = ?; T₂ = 68 °C
Calculations:
(a) Convert temperatures to kelvins
T₁ = (20 + 273.15) K = 293.15 K
T₂ = (68 + 273.15) K = 341.15 K
(b) Calculate the volume
[tex]\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}[/tex]
The new volume of the gas is [tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex].
A crystal of graphite contains which type of bond?
Answer:
Graphite has a giant covalent structure in which:
each carbon atom is joined to three other carbon atoms by covalent bonds
the carbon atoms form layers with a hexagonal arrangement of atoms
the layers have weak forces between them
each carbon atom has one non-bonded outer electron, which becomes delocalised:
A crystal of graphite contains a covalent structure.
What is an example of a covalent bond structure?This is an example of a substance with a huge covalent bond structure. It contains a lot of silicon and oxygen atoms. All atoms in the structure are linked to each other by strong covalent bonds. Atoms combine in a regular arrangement to form a huge concurrent structure.
A giant covalent bond structure is a three-dimensional structure of atoms bonded by covalent bonds. Allotropes are different forms of the same element in the same state. Graphite, graphene, and diamond are allotropes of the same element (carbon) in the same state (solid). Carbon can form up to 4 covalent bonds
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Consider the chemical equations shown here.
2Na(s) + Cl2(g) → 2NaCl(s)
4Na(s) + O2(g) → 2Na2O(s)
What is the overall equation for the reaction that produces NaCl and O2 from Na2O and Cl2?
Na2O(s) + Cl2(g) --> NaCl(s) + O2(g)
2Na2O(s) + Cl2(g)--> 2NaCl(s) + O2(g)
2Na2O(s) + 2Cl2(g)--> 4NaCl(s) + O2(g)
Answer:
2Na₂O₍s₎+ 2Cl₂₍g₎⇒4 NaCl₍s₎ +O₂₍g₎
Explanation:
The more reactive chlorine gas displaces the less reactive oxygen gas from the compound sodium oxide. The correct equation is C. because the number of each type atom on each side is equal hence the equation is balanced. There are 4 sodium atoms on the left side as there are on the right, 4 chlorine on both sides and two oxygen on both sides.
Answer : The correct equation will be,
[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]
Explanation :
The given reactions are:
(1) [tex]2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)[/tex]
(2) [tex]4Na(s)+O_2(g)\rightarrow 2Na_2O(s)[/tex]
Both the given chemical reactions are balanced chemical reaction. So, in order to get the final equation we first multiply equation 1 by 2 and reverse the equation 2 then add both the equations, we get the overall equation for the reaction the produces [tex]NaCl[/tex] and [tex]O_2[/tex] from [tex]Na_2O[/tex] and [tex]Cl_2[/tex]
(1) [tex]4Na(s)+2Cl_2(g)\rightarrow 4NaCl(s)[/tex]
(2) [tex]2Na_2O(s)\rightarrow 4Na(s)+O_2(g)[/tex]
The final reaction will be,
[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]
A chemist prepares an aqueous solution with a volume of 250 mL, containing 4.3 g of KOH. what is the molarity of the solution?
Answer:
either 58.1 or 1075
Explanation:
250 / 4.3 = 58.1
250 * 4.3
Need help on this ASAP !!!!
Answer:
2:2
Explanation:
The question is on mole ration in a chemical equation.
Steps to identify mole ratio in an equation
Write a balance chemical equation-atoms of elements in the reactant side should equal that of the product side2H₂ + O₂⇒ 2H₂O------------------This equation is balanced. how?
Number of hydrogen atoms in reacting side= 2×2=4
Number of hydrogen atoms in the products side= 2×2=4
Number of oxygen atoms in the reacting side=2
Number of oxygen atoms in the product side =2
Writing the mole ratio in the equation
2H₂ + O₂⇒ 2H₂O
2 1 2
Mole ratio of hydrogen to water
2H₂ + O₂⇒ 2H₂O
2 2
= 2:2
What did Ernest Rutherford’s gold foil experiment demonstrate about atoms ?
Answer:
Their positive charge is located in the small nucleus
Explanation:
Ernest Rutherford performed the gold foil experiment in 1911 where he used alpha particles generated from a radioactive source to bombard a thin gold foil.
In his experiment, he observed that the bulk of the alpha particles passed through the gold foil, just a tiny fraction was deflected back. To explain his findings, Rutherford proposed that an atom is made of positively charged centre where nearly all the mass is concentrated called nucleus. Surrounding the nucleus is a large space containing electrons.
He discovered that other than the nucleus at the center, atoms are mostly just empty space. So A makes the most sense.
Can someone help me with Geography connection plz.
Hello There!
South of the equator, some crops grown were beans, cotton, peanuts, peppers, potatoes, coffee, millet and yams
Which rule is used for writing the name of an ionic base?
The chemical name begins with “hydro.”
The chemical name ends with “hydroxide.”
The “ide” ending is changed to “ic.”
The polyatomic “ate” ending is changed to “ic.”
Answer:
The chemical name ends with “hydroxide.”
Explanation:
1- we write the name of the metal first and after that write the nonmetal:
Ex : NaOH ( sodium hydroxide)
2- any compound contains OH group is an ionic base and this group called hydroxide group
3- "Ous" ending is given in the ions with the lower oxidation.
4- " ic" ending is given in the ions with the higher oxidation.
So, the correct answer is: The chemical name ends with “hydroxide.”.
Answer:
The chemical name ends with “hydroxide
Explanation:
got right on edge 2020
For a phase change, H = -44 kJ/mol and SO = -0.12 kJ/(K•mol). What are
G and the spontaneity of the phase change at 350 K?
Answer:
ΔG = - 2.0 kJ/mol and the reaction is spontaneous.
Explanation:
∵ ΔG = ΔH - TΔS,
ΔH = - 44.0 kJ/mol, T = 350.0 K, ΔS = - 0.12 kJ/K.mol.
∴ ΔG = ΔH - TΔS = (- 44.0 kJ/mol) - (350.0 K)(- 0.12 kJ/K.mol) = - 2.0 kJ/mol.
The sign of ΔG assigns the spontaneity of the reaction:
If ΔG is negative: the reaction is spontaneous.If ΔG = 0, the reaction is at equilibrium.If ΔG is positive: the reaction is non-spontaneous.∵ ΔG has a negative value, so the reaction is spontaneous.
So, the answer is:
ΔG = - 2.0 kJ/mol and the reaction is spontaneous.
The Mole #2
Avogadro's Number
PLEASE HELP ASAP! due tmr will give brainliest!
The solution is here,
given mass of copper wire(m)=25 g
no. of moles in given mass of Cu=0.393
a) no. of atoms= no. of moles×avogardo's number
=0.393×6.023×10^23=2.36 ×10^23 atoms
b) 25 g of Cu wire has 0.393 moles
so 200 g of Cu wire has 0.393/25 × 200=3.144 mol.
no. of atoms= 3.144×2.023×10^23=1.89×10^24 atoms.
c) 25 g of Cu wire has 2.36×10^23 atoms
so 5 g of Cu wire has (2.36×10^23)/25 × 5
=4.72×10^22 atoms
( b can also be solve like c)
Select all that apply. The density of an object is 0.950 g/cm3. It will float in which of the following materials? water, density = 1.00 g/cm3 olive oil, density = 0.920 g/cm3 ethyl alcohol, density = 0.789 g/cm3 citric acid, density = 1.660 g/cm3
Answer:
The object will float in water and citric acid.
Explanation:
The density of an object indicates if the object will sink or float in another substance:The object will float, if it is less dense than the substance it is placed in.
The object will sink, if it is more dense than the substance it is placed in.
The object has density of (0.95 g/cm³) is less dense than water (density = 1.00 g/cm³) and citric acid (density = 1.660 g/cm³), so it will float in water and citric acid.The object has density of (0.95 g/cm³) is more dense than olive oil (density = 0.920 g/cm³) and ethyl alcohol (density = 0.789 g/cm³), so it will sink in olive oil and ethyl alcohol.So, the object will float in water and citric acid.
Which of the following elements would most likely have the physical property of malleability?
A. N
B. He
C. Cu
D. P
A. N would probably be the one
The specific heat of a certain type of cooking oil is 1.75 J/(g⋅°C). How much heat energy is needed to raise the temperature of 2.94 kg of this oil from 23 °C to 191 °C?
Answer:
[tex]\boxed{\text{864 kJ}}[/tex]
Explanation:
The formula for the heat transferred to or from an object is
q = mCΔT
Data:
m = 2.94 kg
C = 1.75 J·°C⁻¹g⁻¹
T₁ = 23 °C
T₂ = 191 °C
Calculations:
(a) Convert the mass to grams
m = 2.94 kg = 2940 g
(b) Calculate ΔT
ΔT = T₂ - T₁ = 191 – 23 = 168 °C
(c) Calculate q
q = 2940 × 1.75 × 168 = 864 000 J = 864 kJ
You must provide[tex]\boxed{\textbf{864 kJ}}[/tex].
A solution is prepared by dissolving 106.3 g HCl(g) in enough water to make 175.0 L of solution. The ph of this solution is
The pH of the solution resulting from the dissolution of 106.3 g HCl in 175.0 L of water is 1.77.
The pH of a solution is given by:
[tex] pH = -log([H_{3}O^{+}]) [/tex] (1)
Since HCl is a strong acid, we have that:
[tex] [H_{3}O^{+}] = [HCl] [/tex]
We can calculate the concentration of HCl from its mass and the volume of solution:
[tex] [HCl] = \frac{106.3 g}{175.0 L}*\frac{1 mol}{36.46 g} = 0.017 g/mol [/tex]
Hence, the pH is (eq 1):
[tex] pH = -log([H_{3}O^{+}]) = -log(0.017) = 1.77 [/tex]
Therefore, the pH of the solution is 1.77.
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In your own words describe the process of a physical change
Answer:
Explanation:
The changes that matter undergoes are associated with properties.
A physical change is one that alters the physical properties of matter. The physical properties of matter tells us everything about what a substance is when no change is occurring to its constituents. Such properties can be observed with our senses or instruments or pieces of apparatus. Examples are state of matter, colour, odour, taste, texture etc.
In many ways, physical changes are easily reversible and required little energy to initiate. There is no change in mass and no new kinds of matter are produced.
Examples of physical changes are boiling, melting, freezing, condensation, sublimation, magnetization of metals, breaking of glass, cutting of wood.
Which chemical element has the shortest name?
Answer:
deez nuttts
Explanation:
Element 50
Symbol Sn
TIN
Iron and aluminum are examples of _____________.
Iron and aluminum are examples of elements, which are pure substances that cannot be broken down into simpler substances by chemical changes. Both are naturally occurring and widely used in various applications.
Explanation:Iron and aluminum are examples of elements. Elements are pure substances that cannot be broken down into simpler substances by chemical changes. Iron and aluminum both occur naturally on earth and are widely used in various applications. For example, iron is a key component in steel making and is also an important element in hemoglobin in the blood, while aluminum is a good reducing agent and is used in a multitude of products such as foil and cookware. Other examples of elements include silver, gold, sulfur, oxygen, and copper.
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100 ml of gaseous hydrocarbon consumes 300
ml of oxygen for the complete combustion.
The hydrocarbon is
a. C2H4
b. C2H2
C. C3H8
d. C2H6
The answer would be a. C2H4(ethylene)
1C2H4+3O2~>2CO2+2H2O
Answer:
a. C2H4.
Explanation:
Let's look at the balanced equation for C2H4.
C2H4 + 3O2 --> 2CO2 + 2H2O
So 1 mole of this hydrocarbon reacts with 3 moles of oxygen and since 1 mole of one gas occupies the same volume as another gas, the volumes will be in the ratio 1:3. So this is the required hydrocarbon.