10. (a) Describe how the structure of an alloy is different to a pure metal
You can type directly into this text box below: (2)
10. (b) Suggest why coins are not made of pure copper. Do not give cost as a reason.
You can type directly into this text box below: (1)
Grade 5+ 15 marks
Total 27 marks
Um, yea, please help lol
Answers
Elements may be used once, more than once or not all.. Single line text.
(1 Point)
an element that reacts with water to produce a lilac flame
2.For each of the following, give the name of an element from Period 4 (potassium to krypton), which matches the description.
Elements may be used once, more than once or not all.. Single line text.
(1 Point)
an element used as an inert atmosphere
3.For each of the following, give the name of an element from Period 4 (potassium to krypton), which matches the description.
Elements may be used once, more than once or not all.. Single line text.
(1 Point)
an element that has a valency of 3
4.Write a balanced chemical equation for the reaction between potassium and water. (Non-anonymous question). .
(1 Point)
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5.For each of the following, give the name of an element from Period 4 (potassium to krypton), which matches the description.
Elements may be used once, more than once or not all.. Single line text.
(1 Point)
an element with a fixed valency of 2 that not is not in group 2
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Related Questions
Describe the size of our Sun in relation to other stars and state the heaviest element that a star the size of ours would likely produce?
Answers
Answer:
Our sun is an averaged size star compare to other stars.. And the Iron are the heaviest element they can form.
Answer:
Our sun is an averaged size star compare to other stars.. And the Iron are the heaviest element they can form.
Covalent bonds are most likely to form between atoms of which types of elements?
O A. metals and metalloids
OB. metals and metals
OC. metals and non-metals
D. non-metals and non-metals
Answers
Answer:
Nonmetals and Nonmetals
Explanation:
Covalent bonding is when atoms share valence electrons. Nonmetals typically have 4, so two atoms can bond to have the total of 8.
Covalent bonds are most likely to form between atoms of this type of chemical elements: D. non-metals and non-metals.
A covalent bond can be defined as a bond that exists in chemical compounds and it typically involves the sharing of electrons between the atoms of a non-metallic chemical element.
In Chemistry, there are two (2) main types of covalent bond and these include:
Polar covalent bondNon-polar covalent bondGenerally, a covalent bond is a type of bond that is commonly formed between two (2) non-metals while an ionic bond is usually formed between metals and non-metals.
Read more on covalent bond here: https://brainly.com/question/10429880
How the physical properties of iron are altered by
forming the carbon steel alloy?
A - The iron becomes relatively soft
52/98
B – The iron becomes less hard
C - The iron becomes harder and stronger
D - The iron becomes relatively malleable
Answers
Answer: C - The iron becomes harder and stronger
Explanation:
The pure iron when mixed with the carbon then steel is formed which is the interstitial alloy of iron. About 0.002%- 2.1% (m/m) of carbon. The carbon atoms being smaller than the iron atom occupy the interstitial spaces or interstices in between the iron atoms. Thus these carbon atoms introduce imperfections in the iron crystal layer. The iron crystal layers become harder and they slide past one another and the iron becomes harder.
What is the mass number of 199F?
Answers
Answer:
fluorine
Explanation:
hope it helps
What do these words mean ?
a) filtrate
b) residue
I will give him or her brilliant and thank you
I need small and right answer.
Answers
Answer:
a) filtrate: a liquid which has passed through a filter.
Explanation:
the other one didnt pop up
How is the behavior of food coloring in the pool and heated water different? What caused the difference in their behavior?
Answers
Answer )In hot water, the food coloring diffuses (spreads out) through the water quickly. In cold water, the food coloring diffuses (spreads out) through the water slowly. The hot water causes the food coloring to diffuse faster. At higher temperatures, particles move faster.
i hope it is helpful
if equal amounts of helium and argon are placed in a porous container and allowed to escape, which gas will escape faster and how much faster?
A: Argon is 3.16x faster
B: Helium is 0.316x faster
C: Argon is 0.316x faster
D: Helium is 3.16x faster
Answers
Answer:
B: Helium is 0.316x faster
If equal amounts of helium and argon are placed in a porous container and allowed to escape, helium will diffuse 3.16x faster than argon.
According to Graham's law of diffusion of gases, the rate of diffusion of a gas is inversely related to the square root of its molecular weight.
Mathematically, when two gases are being compared;
r1/r2 = √m2/√m1
Where r1 = diffusion rate of gas 1, r2 = difussion rate of gas 2, m1 = molar weight of gas 1, and m2 = molar weight of gas 2.
Molar weight of helium = 4
Molar weight of argon = 39.9
Hence,
r helium/r argon = √39.9/√4
= 6.317/2
= 3.16
Therefore, 3.16 x r argon = r helium.
In other words, helium will diffuse 3.16x faster than argon.
More on diffusion rate of gases can be found here: https://brainly.com/question/2967915
i need help with this please help!
Answers
Answer: the answer is think it yourself
Explanation:
Which of the following is a property of an ionic compound?
A. Sharing of Electrons
B. Involves two or more anions.
C. Involves a metal and a nonmetal.
D. Has electrons moving from an anion to the cation.
Need this fast
Answers
Answer:
C. Involves a metal and a nonmetal.
Explanation:
Ionic compound involves a metal and a non-metal. Ionic compounds have electrovalent bonds between them.
These compounds are usually made up of metals and non - metals combining to form a unit.
The metals usually has low electronegativity and transfers it electrons to the non - metal. The non-metal has high affinity for the electron. The electrostatic attraction between the ions formed results in the ionic bond.Lab Scenario D:
Kostal & Stout students are in a competition to identify the reactants based on information they collected during a lab.
A metal was burned in a fire and light and heat were released. The crystals produced were identified as lithium oxide.
(2 points) Type of Reaction & Big Clue or Pattern:
(2 points) Balanced equation:
(2 points) Exothermic or Endothermic (include evidence from the scenario to support your answer):
(1 point) Activation Energy:
(1 point) Was a catalyst used (include evidence from the scenario to support your answer)?:
Answers
Answer:
See explanation
Explanation:
A reaction in which heat and light are produced is a combustion reaction. Combustion is said to have occurred when a substance is burnt in oxygen.
The balanced equation of the reaction is;
4Li(s) + O2(g) ------->2Li2O(s)
This reaction is exothermic because heat was produced. The reaction has a low activation energy as the metal easily burst into flames in oxygen. A catalyst is not needed in this reaction because it has a low activation energy.
According to the law of conservation of mass. Atoms are neither created nor destroyed in a chemical reaction. What this means is that in a chemical reaction, the number of atoms of each element on the left hand side must be the same as the same as the number of atoms of the same element on the right hand side.
What is the lowest possible energy level that an electron can occupy?
Answers
Answer: the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. At the lowest energy level, the one closest to the atomic center, there is a single 1s orbital that can hold 2 electrons
Explanation:
An ideal gas system undergoes an isovolumetric process in which 20J of energy is added as heat to the gas. What is the change in the systems internal energy
Answers
Answer:
the change in the system internal energy is 20 J
Explanation:
The computation of the change in the system internal energy is as follows:
Since the volume remains constant so the work done would be zero
Now the change in the internal energy is
= Heat given to system - work done
= 20 J - 0
= 20 J
hence, the change in the system internal energy is 20 J
The same is to be considered
Differentiate between acids and bases on the basis of their pH values. Give an example of each type. keep it simple
Answers
Answer:
differences
Any compound with a pH value between zero to seven is considered acidic, whereas a pH value between seven to fourteen is a base. An acid is called a proton donor, while a base is called a proton acceptor (Kolb, 1978).
examples are:
baking soda is basic (pH = 9.0).
Orange juice is mildly acidic (pH = approximately 3.5)
The environment in your stomach is highly acidic (pH = 1 to 2).
Explanation:
hope that helps.... thanks
Because the electrons have a slight negative charge, there is a slight negative charge near the ___________ atom; there is a slight __________ charge near the hydrogen atom.
Answers
Answer:
Oxygen and positive charge.
Explanation:
The value of electronegativities of oxygen is higher than hydrogen due to which a slight negative charge occur on its oxygen atom and a slight positive charge on its hydrogen atoms of water molecule. The water is polar in nature because oxygen attract the shared pair of electron that leads to partial negative charge on oxygen while on the other hand, the hydrogen atom has acquire partial positive charge.
Which of the following is a chemical change? A. Baking brownies B. Combining eggs, sugar, and flour together to make cookie dough C. Crumpling a piece of paper D. Melting a candle
Answers
Answer:
crumpling of a piece of paper
Explanation:
chemical change cannot be reversed or gootten back
Answer:
Baking brownies!
Explanation:
The mixture of the ingredients undergoes a chemical change when it's heated and the substance changes very much so, melting a candle may seem like a similar change, but the wax is the exact same when it cools back down
Name chemical changes in the chemical given below
boiling of water
curdling of milk
photosynthesis
melting of wax
Answers
Explanation:
boiling of water - Physical changes
curdling of milk - Chemical changes
photosynthesis - Chemical changes
melting of wax - Physical changes
A physical change is a change that alters the physical properties of matter particularly the form and state. In many of such cases, the change is easily reversible.
Examples are boiling of water and melting of wax
A chemical change is a change in which a new kind of matter is formed. It is always accompanied by energy changes. The process is not easily reversible.
Examples are curdling of milk and photosynthesis.
Please help me if you good at science I’m over here struggling I’ll mark brainliest :)
Answers
Answer:
C.
Explanation:
Describe each layer of Earth’s current atmosphere below:
Answers
Answer:
exosphere thermosphere mesosphere stratosphere troposphere
whats happening to the toy
Answers
The toy is being squished
Answer and Explanation:
I think it's balanced only if they are using the same force. If they are balanced then it stays in place but if they are not it moves in the direction that has the most force...
What is the function of each of these structures?
Answers
Units obtained by combining Sl units are called derived units.
true or false
Answers
Answer:
True
Explanation:
Units obtained by combining SI units are called derived units.
Fundamental units are base units and these units are:
Length (m)Time (s)MassNumber of moles TemperatureCurrentDerived units are a combination of one or more fundamental units.
For example:
Speed = [tex]\frac{distance}{time }[/tex]
The unit of speed is m/s and this obtained from length and time
Rolf prepares four solutions using different solutes as shown in the table below.
Which solution is unsaturated?
Solution A
Solution B
Solution C
Solution D
Answers
Answer:
It's A
Explanation:
What would most likely happen to the motion of the planets without the force of gravity from the Sun?
The planets would continue to move in large ellipses.
The planets would drift away from the Sun into outer space.
The planets would slow down, eventually stopping all motion.
The planets would gradually make smaller and smaller ellipses.
Answers
Answer:
the planets would drift away from the sun into outer space
Explanation:
All celestial objects are attracted to each Other by gravity
Answer:
The planets would drift away from the Sun into outer space.
Explanation:
Please help me:( I’ll give u points of its right
Answers
Answer:
k
p
p
k
k
I believe.. ............
What is the molarity of a solution in which 0.321 g of calcium chloride is dissolved in 1.45 L water?
Answers
Answer:
Molarity = 0.002 M
Explanation:
Given data:
Mass of calcium chloride = 0.321 g
Volume of water = 1.45 L
Molarity of solution = ?
Solution:
Molarity = number of moles / volume in litter.
We will calculate the number of moles of calcium chloride first.
Number of moles = mass/molar mass
Number of moles = 0.321 g/ 110.98 g/mol
Number of moles = 0.003 mol
Molarity:
Molarity = 0.003 mol / 1.45 L
Molarity = 0.002 M
PLEASE HELP ME QUICKLY (select all that apply) Enzymes made by extremophiles can be harvested and used in everyday applications. These uses include
making laundry detergents.
making dish detergents.
recycling old tires.
de-hairing hides.
making paper.
Answers
Answer:
A, B, D, E
Explanation:
did it on edg
Answer:
A. Making laundry detergent
B. Making dish detergent
D. De-hairing hides
E. Making paper
Explanation:
Which of these are matter?
atoms
molecules
energy
Answers
The atoms and molecules are matter. Therefore, option A and B are correct.
What is matter ?Matter is defined as anything that occupies space and has mass—in other words, the "stuff" of the universe. All matter is composed of substances known as elements, which have distinct chemical and physical properties and cannot be broken down into other substances via ordinary chemical reactions.
Matter is defined as anything that occupies space and has mass. Water and air are examples of matter, whereas feelings and sound are not.
Physical and chemical properties can be used to classify matter. Matter is defined as something that occupies space and has mass. Solid, liquid, and gaseous are the three states of matter. The conversion of a material from one state of matter to another without changing its chemical composition is referred to as a physical transition.
Thus, option A and B are correct.
To learn more about the matter, follow the link;
https://brainly.com/question/3764450
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Use the information below to match each object with the metal it is made of.
Object A - a small block of metal with a mass of 853 g and a volume of 490 cm.
Object B - metal pellets with a mass of 48.76 g and a volume of 4.30 cm3
Object C-a 631-cm' medallion with a mass of 4965 g.
Object D - a coin with a volume of 3.15 cmº and a mass of 28.23 g.
Answers
Answer:
Explanation:
Love the pfp
A student in your class has decided to dissolve Epsom salts in water and observe the crystals that are left behind after the water evaporates. Is this an example of a chemical change? Use evidence and scientific reasoning to support your claim.
Answers
Answer:
Physical change
Explanation:
Dissolution of salt in water is a typical example of physical change and not a chemical change.
In a chemical change new products are formed which are different from the reactants.
In a physical change, the state of matter changes from one form to another.
Since this is a change in state, a physical change has occurred. Also, the reaction is easily reversible simply by evaporation. Most chemical changes are not easily reversible.Dissolving epsom salts in water and observing the crystals that are left behind after the water evaporates is not a chemical change.
CHEMICAL CHANGE:
Changes that occur in nature can either be physical or chemical. Physical change are those changes that does not involve the chemical property of substances involved. Chemical change, on the other hand, alters the chemical composition of the substances involved. Examples are rusting. Chemical change forms a new product and are usually irreversible. According to this question, dissolving epsom salts in water is not an example of chemical change because it does not involve the formation of new substances.Learn more at: https://brainly.com/question/23693316?referrer=searchResults
At what temperature will 5 g of Cl2 exert a pressure of 900 mmHg at a volume of .75 L?
Answers
The temperature : 154.73 K
Further explanationGiven
mass = m = 5 g of Cl2
P = 900 mmHg = 1,18421 atm
V = 0.75 L
Required
Temperature
Solution
mol Cl2 = mass : MW = 5 : 71 = 0.07
Ideal gas law : PV = nRT
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.082 L.atm / mol K
T = temperature, Kelvin
T = PV/nR
Input the value :
T = 1.18421 x 0.75 / 0.07 x 0.082
T = 154.73 K