Answer:
true
Explanation:
i did the test
Answer: False
Explanation:
In a submarine beneath the ocean’s surface, a captain peered into a long tube to see possible threats in the sea and air above. This sight tube, called a periscope, was designed by the Frenchman Marie Davey in 1854. Davey’s periscope contained two mirrors, one placed at each end of a vertical tube. The mirrors were set parallel to each other and at 45 degrees to the vertical. The reflective surfaces faced each other. When light from an object on the surface reflected downward, an image appeared to the eye. People in submerged submarines could see what was above them!
Imagine you are in a submerged submarine looking through a periscope. What are some things you might see?
Ca+Cl2-->CaCl2 Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction.
Answer:
Oxidation half
Ca -----> Ca2+ +2elecyrons
Reduction half
Cl2 + 2electrons ------> 2Cl-
Explanation:
what is a compound?
Answer:
NOUN
a thing that is composed of two or more separate elements; a mixture
Explanation:
basically a mixture
Solid to Gas
As a change is state takes place, heat _______ and temperature _______.
A. Increases, stay the same
B. Stay the same, changes
C. Increases, increases
Answer:
c. c. c c c c c cçcc. ccccccccc
Explanation:
ccc cc
When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. So option A is correct option.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. Hence option A is correct.
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true or false
sugar melting an example of oxidation
and
water evaporating
Answer:
false i think
Explanation:
1. What do microorganisms share in common?
Answer:
Bacterial species are typified by their diversity. There are three notable common traits of bacteria, 1) lack of membrane-bound organelles, 2) unicellular and 3) small (usually microscopic) size.
Explanation:
What Are the Characteristics Common to All Bacteria?
Single-Celled. Perhaps the most straightforward characteristic of bacteria is their existence as single-celled organisms. ...
Absent Organelles. ...
Plasma Membrane. ...
Cell Walls. ...
DNA.
What is the molarity of a solution that has 2.87 moles of NaCl in 5020 mL of solution?
Why is water said to be universal solvent?
A.it dissolves some substances.
B.It dissolves almost all substances
C.It is dissolved by some substances.
D.It is dissolved by almost all substances.
Answer:
B
Explanation:
And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This allows the water molecule to become attracted to many other different types of molecules.
Answer:
I believe it's B
Explanation:
Water can dissolve with any that's why it's universal and can dissolve substancrs more than any other Liquid.
please give me brainliest!
hope this helps
200cm3 of hydrogen diffused through a porous pot in 40secs. How long will it take 300cm3 of chlorine to diffuse the same pot?
Which of the following is an example of a chemical element a. Salt B.water c.sugar d.sodium
Answer:
the answer is sodium
Explanation:
hope this helps
9. Carbon-14 has a half-life of 5,730 years. How many years have passed after 3
half-lives?
Answer:
120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed? If you have a 300
Explanation:
Hope this helps!
How do you solve -8r=240
Answer:
You solve that dividing beach term by -8 and simplifying which for this answers will give you r=-30
Explanation:
Pls correct me if I’m wrong.
Hope this helps :)
If 5.3 moles of magnesium phosphate react with excess sodium chloride how many moles of magnesium chloride will be formed?
How does the number of protons compare to the number of
electrons in a canton
Answer: The number of protons in cation is more than the number of electrons
Explanation:
cations are positive ions that means that they lose electrons to be stable nd have electron configuration (atomic number ) equivalent to the preceding noble gas
as : sodium 11 , it loses on electron to be stable and its electron configuration is equivalent to neon 10
so ,the number of protons in cation is more than the number of electrons
i hope it helps!
Convert 4, 294 grams to pounds. Use the conversion factor 1 pound = 453.59 grams.
Q.3 Which the following statements about the given reaction are correct:
3Fe(s) + 4H2O(g)- Fe203 (S) + 4H2(g)
i) Iron metal is getting oxidized
ii) Water is getting reduced
iii) Water is acting as reducing agent
iv) Water is acting as oxidizine agent
a) (i), (ii) and (iii) b)(iii) and (iv)
c) (i), (ii) and (iv) d) (ii) and (iv)
Answer:
The statements which are correct are;
c) (i), (ii) and (iv)
Explanation:
The chemical equation is presented as follows;
2Fe(s) + 3H₂O(g) → 3Fe₂O₃(s) + 3H₂(g)
Therefore, we have;
i) The iron gains oxygen atoms and therefore gets oxidized
The iron loses 3 electrons each to become oxidized to Fe³⁺ in Fe₂O₃
ii) The water loses oxygen and therefore it is getting reduced
iv) The water donates oxygen and therefore it is acting as the oxidizing agent
The correct options are (i), (ii) and (iv).
2. A sample of oxygen gas is placed in a rigid 1.5L glass container at STP. If the gas is
heated to 100 degrees (Celcius) what is the new pressure in mmHg?
The new pressure : P₂ = 1038.39 mmHg
Further explanationGiven
1.5 L container at STP
Heated to 100 °C
Required
The new pressure
Solution
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure).
So P₁ = 1 atm = 760 mmHg
T₁ = 273 K
T₂ = 100 °C+273 = 373 K
Gay Lussac's Law
When the volume is not changed, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Input the value :
P₂=(P₁.T₂)/T₁
P₂=(760 x 373)/273
P₂ = 1038.39 mmHg
What is the total number of joules required to freeze a 10 g sample of water at 0°C?
show work if possible and will give brainliest
Explanation:
the answer will be 98.4 kJ
As per concept of enthalpy of fusion , 98,397 joules of energy are required to freeze 10 g of water at 0°C.
What is enthalpy of fusion?Enthalpy of fusion is defined as the enthalpy change which results from when a substance changes its state from solid to a liquid at a constant pressure.Heat of solidification is opposite of enthalpy of fusion.During fusion there is a phase transition which takes place, from liquid to solid.
The temperature at which the fusion takes place is called as the fusion temperature. This enthalpy is accompanied without any change in temperature.
Enthalpy of fusion of water=333.55 J/g . This value is for 1 g of water as per definition,hence for 10 g water enthalpy of fusion is 10×333.55=3335.5 J.
Hence, 3335.5 joules are required for freezing 10 g sample.
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Na * 6.02 * 10^23 pls help an it got to include na
Answer:
6.02E23Na
Explanation:
you just convert the element to a decimal form
3. Ni(NO2)3
What’s the name for the formula
Leila made herself a cup of hot chololate weighing 150 grams. If she started with 125 grams of milk, how many grams of hot chocolate mix did she add?
Answer:
150g-125g
=25 of hot chocolate mix
PLEASE CAN SOMEONE PLEASE HELP ME I CAN'T DO IT :(
CaCO3 + H2SO4 __________ + H2O + CO2
Na2CO3 + __________ 2NaCl + H2O + CO2
Answer:
H2SO4 + CaCO3 → CaSO4 + H2O + CO2 - Balanced equation | Chemical Equations online!
Na2co3 HCL nacl h2o co2
This is an acid-base reaction (neutralization): Na 2CO 3 is a base, HCl is an acid. This is a gas evolution reaction, CO 2 is the formed gas.
is CdCi2 covalent or ionic
Answer:
binary and 11
Explanation:
CaCl2 or Calcium Chloride is an ionic bond and not a covalent bond. Since there should be sharing of electrons between two atoms to be a covalent bonding. In case of calcium chloride, the calcium gives up an electron to each chlorine atom, becoming Ca2+ ions and chlorine become Cl– ions.
:)
why is there no reaction between copper and sodium chloride
remember I am talking of copper alone and not copper sulfate.
Answer:
If the solution is not in contact with air, nothing will happen. If the solution is in contact with air, it will be not a reaction between copper, water and sodium chloride..
in the end there will be no reaction
Which statement describes why the viscosity of water is lower than that of
olive oil?
A. The molecules that make up water have more kinetic energy than
the molecules that make up olive oil.
B. The molecules that make up water can more easily slide past one
another than the molecules that make up olive oil.
C. The molecules that make up water have less kinetic energy than
the molecules that make up olive oil.
D. The molecules that make up water are larger than the molecules
Answer:
Option B. The molecules that make up water can more easily slide past one another than the molecules that make up a olive oil.
The molecules that make up water can more easily slide past one another than the molecules that make up olive oil. Hence, option B is correct.
What is viscosity?Viscosity is a term used to describe FLUIDS, which includes liquids and gases. Viscosity refers to the ability of a gas or liquid to resist flow.
Olive oil has a higher viscosity than water because it is a much larger molecule than water with larger dispersion forces.
Hence, option B is correct.
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What is the most likely effect of an increase in precipitation?
Lakes dry up. Shortage of water. Decrease in humidity.
Turgor pressure can help plants move. Internal water pressure can cause -
1. What are commonly called as "shooting stars"?
A. asteroids
B. comets
C. meteors
D. meteorites
2. What are found in the circular or somewhat like "doughnut-shaped"
region between Mars and Jupiter?
A. asteroids
B. comets
C. meteors
D. meteorites
3. Which Near-Earth Objects (NEO) are found on the Kuiper Belt and Oort
Cloud?
A. asteroids
B. comets
C. meteors
D. meteorites
4. What are comets made of?
A. dust only
B. metal only
C. dust and metal
D. dust, metal, and ice
5. What do you call the shining "head" around a comet?
A. coma
B. crown
C. halo
D. ring
Answer:
I hope I can help you
I hope I can help you
Calculate how many grams of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al2O3).
4Al + 3O2 → 2Al2O3
i need this like rn please.
Answer:
0.347
Explanation:
Al is the limiting reagent.
Explanation:
The stoichiometry of the reaction is such that 4 moles of Al are required for every 3 moles of diatomic oxygen. This means that if the ratio of Al to diatomic oxygen is greater than 4/3, then the oxygen is the limiting reagent. If the ratio of Al to diatomic oxygen is less than 4/3, then Al is the limiting reagent.
The problem state that the ratio of Al to diatomic oxygen is
0.32
0.26
=
16
13
=
48
39
<
52
39
=
4
3
The ration of Al to diatomic oxygen is less than 4/3, so Al is the limiting reagent.
We can also see this if we ask the question "How much Aluminum" is required to completely react 0.26 moles of diatomic oxygen??
0.26
moles
O
2
×
4
moles
A
l
3
moles
O
2
≈
0.347
moles
A
l
So it would take 0.347 moles of Al to completely react with all of the oxygen, however there is only 0.32 moles of Aluminum present, so there is not enough Al to react with all of the oxygen, and so we say that the Al is the limiting reagent.
The mass of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃) is
What is mass?
Mass of any element is equal to the product of its number of moles and molar mass.
For the compound, Aluminum oxide (Al₂O₃)
The atomic masses of Aluminum is 23 and oxygen is 16.
Molecular or molar mass = ( 2 × 23 ) + ( 3 × 16 ) units
M = 46 + 48 = 94 units
The mass of Aluminum in 1 mole of aluminum oxide ,46 grams in 94 grams
Mass of Aluminum in the given 21.6 g of Aluminum oxide will be;
94 grams of Aluminum oxide contains 46 grams of Aluminum.
21.6 grams of Aluminum oxide will contain ( 46 / 94 ) × 21.6 = 10.57g of Aluminum.
Therefore, 10.57g of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃)
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what are oil and waters properties of matter?
Answer:
Two other beneficial properties of the oil include the inhibition of corrosion of metal surfaces, such as steel, and the removal of dirt and detritus via detergency.
Properties of water include its chemical formula H2O, density, melting, boiling point & how one molecule of water has two hydrogen atoms covalently bonded to one oxygen atom.