Answer:
Magnification is the number of times larger an image is compared with the real size of the object.
Magnification = Image / Actual = 5/0.4 =12.5
Explanation:
is the following sentence true or false, in undisturb sedimentary rocks, the oldest layers are found on the bottom
Answer:
True.
Explanation:
this is because undisturbed sedimentary rocks forms in layers.
what is the concentration of nitric acid solution with pH 2
Answer:
Nitric acid = HNO3
HNO3 → H+ NO3 2-
Since it's an acid
pH = -log of concentration of H+ ions
pH = -log (H+)
2 = -log(H+)
Taking antilog of both sides
H+ = 10^-2
= 0.01
Concentration of nitric acid = 0.01mol/dm^-3
Hope this helps.
Which symbol can be used to indicate the pressure at which a chemical reaction is carried out?
25°C
2 atm
Pt
Answer:
2 atm
Explanation:
Different symbols have different meanings in chemistry. For example, the symbol Δ = adding energy to the reactants.
To identify whether the reactants combine with a specific pressure, we have to use the symbol atm, in such a case 2 atm.
Hope that helps!
what happens when sodium and sulfur combine
Answer:
It emits hydrogen sulfide...smells like rotten eggs..
ty:)pls let me know whether this is ryt:D
Answer:
Hey!
Your answer is that it creates hydrogen sulfide gas / liquid...
Which really smells...
Explanation:
HOPE THIS HELPS!
Consider the intermediate chemical reactions. 2 equations. First: upper C a (s) plus upper C upper O subscript 2 (g) plus one half upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s). Delta H 1 equals negative 812.8 kilojoules. Second: 2 upper C a (s) plus upper O subscript 2 (g) right arrow 2 upper C a upper O (s). Delta H 2 equals negative 1, 269 kilojoules. The final overall chemical equation is Upper Ca upper O (s) plus upper C upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s).. When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed. is halved. has its sign changed. is unchanged.
Answer: When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
Explanation:
Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.
According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.
The overall chemical reaction follows:
[tex]CaO(s)+CO_2\rightarrow CaCO_3(s)[/tex] [tex]\Delta H^o_{rxn}=?[/tex]
The intermediate balanced chemical reaction are:
(1) [tex]Ca(s)+CO_2(g)+\frac{1}{2}O_2(g)\rightarrow CaCO_3(s)[/tex] [tex]\Delta H_1=-812.8kJ[/tex]
(2) [tex]2Ca(s)+O_2(g)\rightarrow 2CaO(s)[/tex] [tex]\Delta H_2=-1269kJ[/tex]
The expression for enthalpy of the reaction follows:
[tex]\Delta H^o_{rxn}=[1\times (\Delta H_1)]+[\frac{1}{2}\times (-\Delta H_2)][/tex]
Hence, when the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
Answer:
A. is halved and has its sign changed.
Explanation:
just took the test on edge
how many joules of heat are absorbed when 1000g of water is heated from 18Celsius to 85celsius?
Answer + Explanations
Calculate heat absorption using the formula:
Q = mc∆T
Q means the heat absorbed, m is the mass of the substance absorbing heat, c is the specific heat capacity and ∆T is the change in temperature.
The heat absorbed is calculated by using the specific heat of water and the equation ΔH=cp×m×ΔT. 4. Water is vaporized to steam at 100oC. The heat absorbed is calculated by multiplying the moles of water by the molar heat of vaporization.
You can do this easily: just multiply the heat capacity of the substance you're heating by the mass of the substance and the change in temperature to find the heat absorbed.
To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in ...
Q = mc∆T. Q = heat energy (Joules, J) m = mass of a substance (kg) c = specific heat (units J/kg∙K) ∆ is a symbol meaning "the change in"
Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.
A reaction that absorbs heat is endothermic. Its enthalpy will be positive, and it will cool down its surroundings. This reaction is exothermic (negative enthalpy, release of heat).
Quantitative experiments show that 4.18 Joules of heat energy are required to raise the temperature of 1g of water by 1°C. Thus, a liter (1000g) of water that increased from 24 to 25°C has absorbed 4.18 J/g°C x 1000g x 1°C or 4180 Joules of energy.
What symbol is used in a chemical equation to indicate “produces” or “yields”?
Answer:
This should help you with your problem
The symbol that is used to indicate “produces” or “yields” is "→"
Forward arrow is used to indicate the reaction moving towards products.
Chemical reaction:In a chemical reaction this forward arrow "→" is used to differentiate between reactants and products.Reactants are written on L.H.S and Products are written on R.H.S.For example:H₂SO₄ (aq) + 2NaOH(aq) → Na₂SO₄(s) + 2H₂O (l)
This reaction yields or produces sodium sulphate and water when sulphuric acid and sodium hydroxide reacts.
Find more information about Chemical reaction here:
brainly.com/question/26018275
help on this one, i have no idea how to do it
Answer:
c
Explanation:
During which event does the moon appear closer? Select one: a. Apogee b. Penumbra c. Perigee d. Umbra
Answer:
Perigee
Explanation:
In Perigee, The moon appears closer.
what type of reaction is : CaCo3+ HCl = CaCl2 + CO2 +H2O
Answer:
Double decomposition reaction
Explanation:
When hydrochloric acid reacts with any carbonates/hydrogen carbonates the products formed are metal chloride , water and carbon dioxide.Since HCl decomposes salts of weaker acids.
So the equation of the reaction between calcium carbonate and HCl is:
CaCO3+2HCl =CaCl2+H2O+CO2
This reaction is also known as double decomposition reaction.
Answer:
Double decomposition reaction
Explanation:
When hydrochloric acid reacts with any carbonates/hydrogen carbonates the products formed are metal chloride , water and carbon dioxide. Since HCl decomposes salts of weaker acids. This reaction is also known as double decomposition reaction.
write the steps you would use for making tea.use the words solution,solvent,solute,dissolve,soluble,insoluble,filtrate and residue
Determine the genotypes of offspring 1-8.
Which refers to a measure of how acidic or basic a solution is? pH solubility reactiveness hardness
Answer:
it is Ph of solution that tells you the acdic and basic nature of solution
if PH is lower than 7 the soution is acidic and if PH is larger than 7 the solution is basic
Explanation:
Answer:
A. Ph
Explanation:
can anyone just help me with these
Identify the following compounds as either ionic (I)or Covalent (c)
Explanation:
3 C
4 C because bonds of non-metal to non-metal N to O
5 I because metal ion loss valence electron Ca2+ non-metal gains valence electron F-
I NEED HELP ASAP !!!!!!!!!!!!!!
IF YOUR RIGHT ILL LIKE YOUR TIK TOKS OR GIVE U MOST BRAINLY
What is involved in redox reactions
A.the transfer of electrons between reactants
B.the bonding of ions to form chemical compounds
C.the addition of water to break down food macromolecules
D.the breaking down of water into hydrogen and oxygen atoms
Answer:
A
Explanation:
Redox reactions are comprised of two parts, a reduced half and an oxidized half, that always occur together. The reduced half gains electrons and the oxidation number decreases, while the oxidized half loses electrons and the oxidation number increases.
Answer:
a
Explanation:
Which statement is true of a reversible reaction at equilibrium?
А.
The concentration of reactants is less than the concentration of products.
B.
The concentration of reactants and the concentration of products are equal.
с.
The concentration of reactants is greater than the concentration of products.
D.
The concentration of reactants and the concentration of products are constant.
Ε.
The concentration of reactants is decreasing and the concentration of products is increasing,
Answer:
D.
The concentration of reactants and the concentration of products are constant.
Explanation:
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Which compound contains covalent bonds? AlN Ca3N2 NaCl HCl
Answer:
Ca3N2
Explanation:
Why does sugar mix more in hot water than in cold water?
Answer:
this is because hot water has more energy than cold water
Calculate the grams of calcium present in 70 grams of calcium chloride.
Answer:
37.1g of Ca
Explanation:
Hello,
Molecular formula for calcium chloride = CaCl
Molar mass = 40 + 35.5 = 75.5g/mol
Assuming there's one mole of CaCl
1 mole = mass / molar mass
Mass = 1 × 75.5
Mass = 75.5g
75.5g of CaCl contains 40g of Calcium
70g of CaCl will contain x g of Calcium
X = (70 × 40) / 75.5
X = 37.086g
Therefore, 70g of CaCl contains approximately 37.1g of Ca
what is the other metal react iron which get rusted
Answer:
The answer is OXIDATION REACTION.
Answer:
There's no other metal.
Explanation:
Iron reacts only with water and air to get the object rusted. There is no other metal which reacts with iron to get the object rusted.
However,
Zinc can be used to protect Metal from Rusting.
What is the Ka of a 0.0796 M solution of nitrous acid (HNO2) with a pH of 2.95?
Answer:
Coefficient = 1.58
Exponent = - 5
Explanation:
pH = 2.95
Molar concentration = 0.0796M
Ka = [H+]^2 / [HA]
Ka = [H+]^2 / 0.0796
Therefore ;
[H+] = 10^-2.95
[H+] = 0.0011220 = 1.122 × 10^-3
Ka = [H+] / molar concentration
Ka = [1.122 × 10^-3]^2 / 0.0796
Ka = (1.258884 × 10^-6) / 0.0796
Ka = 15.815 × 10^-6
Ka = 1.58 × 10^-5
Coefficient = 1.58
Exponent = - 5
Which one of the following oxide has both acidic and basic properties?
A. MgO
B. N2O
C. Al2O3
D. SO2
Answer:
The answer is C
Explanation:
Aluminium oxide is an amphoteric oxide.
MgO is a basic oxide.
N2O is an acidic oxide.
SO2 is an acidic oxide.
Which statement provides the best example of a scientific conclusion?
O A. Graphite can be used to make pencils.
O B. Diamond is mined in South Africa
O C. Diamond and graphite are both composed of carbon.
D. Diamond jewelry is prettier than graphite jewelry.
Answer:
c
Explanation:
In science, there is always processing of an item or sample to get an end product. So if the diamond is mined; there is a processing stage used to come out with the final product as Diamond through carbon in the heating process
Name the first 20 elements of the pereodic table
Answer:
alkali metals hydrogen lithium sodium potassium rubidium cesium francium alkaline earth metals beryllium magnesium calcium strontium barium radium group 3 boron aluminium gallium indium thalium carbon family carbon silicon germanium tin lead
Explanation:
i hope this will help you :)
There's Hydrogen and Helium
Then Lithium, Beryllium
Boron, Carbon everywhere
Nitrogen all through the air
With Oxygen so you can breathe
And Fluorine for your pretty teeth
Neon to light up the signs
Sodium for salty times
Silicon
(Phosphorus, then Sulfur) Chlorine and Argon
(Potassium) And Calcium so you'll grow strong
(Scandium) Titanium, Vanadium and Chromium and Manganese
This is the Periodic Table
Noble gas is stable
Halogens and Alkali react aggressively
Each period will see new outer shells
While electrons are added moving to the right
Iron is the 26th
Then Cobalt, Nickel coins you get
Copper, Zinc and Gallium
Germanium and Arsenic
Selenium and Bromine film
Which describes gneiss?
igneous
formed from shells
tends to split along bands
grains randomly arranged
Answer:
tends to split along bands
Explanation:
Answer: C
Explanation: E2022
PLEASE HELP
Which Is a result of topsoil loss A increase soil fertility B poor crop production C soften soil surface D deposition of aggregate
Answer:
B - Poor crop production
Explanation:
I just did the quiz on Edge 2021
Answer:
b
Explanation:
A very good example of soft water is A. Distilled water B. Sea water C. Underground water D. Polluted water
Answer:
The answer is option A.
Distilled water
Since all the chemicals that will cause hardness in the water has been removed.
Hope this helps.
Which of the following has the shortest bond lenght Options A). H2 B).N2 C).O2 D).F2
Answer:
B. N2
Explanation:
The triple bonds pull the atoms closer together, and since N2 is the only molecule with the triple bond, it is the shortest bond length.
Give examples of partially miscible liquids.
Answer: Water, alcohols, aldehydes, and ketones.
Explanation:
Answer:
Examples of Partially Miscible and Immiscible Liquids: Illustrations of immiscible liquids are cooking oil and water, milk and oil, gasoline and water, and liquid metals and water. There are as well partially miscible liquids such as honey and water, butanol and water, and potassium chloride and water.
Explanation:
Hope it helps
Heating devices can be made by passing an electric current through a conductor of:
high resistance
low resistance
high conductivity
low conductivity
Answer:
High resistance
Low conductivity
Explanation:
The more resistance (aka less conductivity) there is, the more the energy is turned into heat than simply passing through the object.