Answer:C
Explanation:The samples are composed of different proportions of copper and zinc
For a certain chemical reaction, the bond energy of the reactants is 43 kJ, and 35 kJ of energy is released. For energy to be conserved, what is the bond energy of the products?
Answer:
78kJ
Explanation:
Energy change = Energy in (reactants) - Energy out (products)
According to this question, energy is released, meaning that the reaction is EXOTHERMIC. Hence, the energy change will be negative (-) i.e bond energy of reactants is greater than bond energy of products.
Energy in = bond energy of reactants = 43kJ
Energy out = bond energy of products = ?
Energy change of exothermic reaction = -35kJ
Therefore;
-35kJ = 43kJ - x
x = 35kJ + 43kJ
x = 78kJ
The bond energy of the products is 78kJ.
An oxide named CrO. So the salt of chromium has the corresponding valence
Answer:
this question doesnt make any sene
Explanation:
How many moles of hydrogen
are in 3.7 moles of C8H11 NO2?
What is the correct name for the following compound: P2Br5
Answer:
Diphosphorus pentabromide is the official name.
Explanation:
The diagram is a model of one way that materials move into a cell.
Which Sentence explains what happens in last step?
A. a vacuole carries particles into the cell
B. The cell membrane surrounds particles outside the cell.
C. Phospholipids in the cell membrane allow particles to pass through
D. Transport proteins push particles out of cell.
Answer:
B. The cell membrane surrounds particles outside the cell.
Explanation:
The last step is when the cell membrane completely surrounds particles outside the cell.
This process is often known as endocytosis.
endocytosis is the process whereby a cell ingests materials by engulfing them using the cell membrane. In this process, the cell membrane completely covers the food.7. Which of the following is unlikely to
happen to zinc?
A) It is rolled into sheets.
B) It is used to coat a steel hull.
C) It is used in a battery.
D) It is used as an insulator.
Answer:D) it is used as an insulator
Explanation:
What is the pressure inside a 2.0 L bottle filled with 0.25 mol of carbon dioxide gas at 25 °C?
Answer:
3.1atm
Explanation:
Given parameters:
Volume of gas = 2L
Number of moles = 0.25mol
Temperature = 25°C = 25 + 273 = 298K
Unknown:
Pressure of the gas = ?
Solution:
To solve this problem, we use the ideal gas equation.
This is given as;
PV = nRT
P is the pressure
V is the volume
n is the number of moles
R is the gas constant = 0.082atmdm³mol⁻¹K⁻¹
T is the temperature
P = [tex]\frac{nRT}{V}[/tex]
Now insert the parameters and solve;
P = [tex]\frac{0.25 x 0.082 x 298}{2}[/tex] = 3.1atm
_________feedback is a type of feedback in which a system is triggered to produce an output.
Answer:
positive
Explanation:
Answer:
Positive feedback is a type of feedback in which a system is triggered to produce an output.
Explanation:
Have a great rest of your day
#TheWizzer
the process that breaks down rocks
Helpppppp!!!!! It’s due today
URGENT!!!!!
Answer:
Explanation:
2. a [CO3 2-][H3O+] / [H2O][HCO3-
b. [H2PO4-][H3O+]/[H3PO4][H2O]
Determine which equations you would use to solve the following problem: Calculate the amount of heat needed to change 20.0 g of ice at -10.0°C to water at 89.0°C.
Answer:
Q = 4019.4 J
Explanation:
Given data:
Mass of ice = 20.0 g
Initial temperature = -10°C
Final temperature = 89.0°C
Amount of heat required = ?
Solution:
specific heat capacity of ice is 2.03 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
ΔT = 89.0°C - (-10°C)
ΔT = 99°C
Q = 20.0 g ×2.03 J/g.°C × 99°C
Q = 4019.4 J
PLZ ANSWER! MULTIPLE CHOICE!! MUST BE CORRECT!! I CANNOT GET THIS WRONG.
Match these solutions with their examples:
Liquid in liquid
Solid in liquid
gas in liquid
gas in gas
solid in solid
liquid in solid
Gas in solid
Examples
A. Air
B. seawater
C. marshmallow
Answer:
sea water
Explanation:
a sea water can match the following
Please help me with my Chemistry homework!! I have so much homework to do for other classes and I’m so stressed so even answering one question would be amazing!!!
1. A graduated cylinder had an initial volume of water of 22 mL. After an iron nail is dropped into the cylinder, the water rises to 38 mL. What is the volume of the nail?
2. Ms.Chavez dropped a gold ring into a graduated cylinder filled with water. The water level was originally at 20 mL. Now the water is at 25mL. Ms.Chavez knows that means the volume of the ring is 5 mL. What else would she have to do to find the density of her ring? Explain.
3. A simple of liquid propanol has a volume of 20.0 cm*^3 and a mass of 15.0 g. What is the density of propanol? Write only your answer below.
a gas tank is under 1 atm pressure at room temperature. if the temperature halved,what will happen to the pressure
Answer:
The pressure will also be halved.
Explanation:
Gay-Lussac's law states that the relationship between temperature and pressure is directly proportional to each other. If the temperature goes up, so will the pressure.
What information can a foliated metamorphic rock provide you about the conditions under which it formed?
Which is the molecular shape of water, H20, according to the VSEPR theory?
A. Bent
B. Tetrahedral
C. trigonal pyramidal
D. Trigonal planar
Answer:
the answer is A
Explanation:
Astronomers observed that the orbit of Uranus was not uniform. Therefore, they hypothesized the existence of another planet. This is an example of scientific investigation being led by _____.
Inductive Reasoning
Deductive Reasoning
Answer:
This is an example of scientific investigation being led by inductive reasoning.
Explanation:
Inductive reasoning is the type of reasoning used to make broad generalizations from specific observations. We have certain pieces of data and make conclusions based on them. In the given example, astronomers have made a specific observation - that the orbit of Uranus isn't uniform. Based on that fact, they made a broader conclusion - that there is another planet. There are probably more things that could lead to the same conclusion.
The opposite is deductive reasoning, where a person starts off with a broad generalization and tries to make specific, logical conclusions based on it.
OK HURRY AND PLEASE ANSWER COZ THIS TEST IS TIMED BROS
What is the sum of the coefficients in the balanced chemical equation for the combustion of acetone, C3H6O(l), in air?
Express answer as an integer
Answer:
C3H6O + 4O2 → 3CO2 + 3H2O or 11
Explanation:
Answer:
11
Explanation:
How many molecules of CO2 are contained in 4.40g of CO2
Answer:
6.02 x 10²²molecules
Explanation:
Given parameters:
Mass of CO₂ = 4.4g
Unknown:
Number of molecules in CO₂ = ?
Solution:
To find the number of molecules in the given mass, we have to find the number of moles in the compound first;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Insert the parameters and solve;
Number of moles = [tex]\frac{4.4g}{44g/mol}[/tex] = 0.1mol
1 mole of a substance contains 6.02 x 10²³molecules
0.1 mole of CO₂ will contain 0.1 x 6.02 x 10²³molecules
= 6.02 x 10²²molecules
Which best describes why NH4+ can form an ionic bond with CF?
Its outermost shell gains one or more electrons from CF.
Its positive charge is attracted to the negative charge of Cr.
It has a negative charge that is spread over the entire ion.
It has a nitrogen atom that is strongly attracted to Cr.
Answer:
Its positive charge is attracted to the negative charge of Cl-
Note: The correct question is given below:
Which best describes why NH4+ can form an ionic bond with Cl-?
Its outermost shell gains one or more electrons from Cl-.
Its positive charge is attracted to the negative charge of Cl-.
It has a negative charge that is spread over the entire ion.
It has a nitrogen atom that is strongly attracted to Cl-.
Its positive charge is attracted to the negative charge of Cl-.
Explanation:
An ammonium ion is a positively charged ion which is composed of a molecule of ammonia and a hydrogen ion which are in a coordinate covalent bond due to the lone pair of electrons of the nitrogen atom in the molecule ammonia. The chloride ion however, has an extra electron which gives it a negative charge.
An ionic bond is formed between two oppositely charged ions by a transfer of electrons from one atom to another. It usually occurs between non-metals and metals. However, that formed between ammonium ion and chloride ion is between non-metals entirely.
Due to electrostatic attraction between the oppositely charged ions, an ionic bond is formed between ammonium ion, NH4+, and chloride ion, Cl-.
Why is our mindset more important when you try to learn remotely than when you are learning face to face?
Answer:
It is more important because of the freedom.
Explanation:
While at home you can do your work of course... but you could lay down, take a nap. You could get on the game, play around. You could draw, and fiddle and dance and do WHATEVER you want with no teacher to stop you so you have to be your own motivation. You have to be your own teacher or its VERY easy to fail.
Analysis of a sample of an oxide of nitrogen gave 47% of nitrogen.What is the empirical formula of the oxide?
Answer:
N2O
Explanation:
hope am right.....
The average speeds of gas molecules in cylinders A, B, C, and D are 0.001 m/s, 0.05 m/s, 0.1 m/s, and 0.5 m/s respectively. Which cylinder contains gas that is closest to absolute zero?
Answer:
cylindar a
Explanation:
I took the test
Answer:
A
Explanation:
SECOND SCIENCE WORKSHEET:
Answer the following:
1:
Which type of cell has a cell wall?
2: What is the smallest part of any substance?
3:
What is used to see tiny objects?
4: What name is given to a substance where all the atoms are the
same?
5: What does the safety symbol with flames mean?
6: What gives the ability to do work?
7: Which part of the cell controls all cell activity?
8: By what process does a liquid change to a gas?
I
Answer:
1 animal cell
2?
3 mircoscope
4?
5 it means whenever you becareful
HELPP ME
express with equations the transformations marked on the scheme
The reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Transformations :
1. CaO + H₂O⇒Ca(OH)₂
2. CaO + CO₂⇒CaCO₃
3. Ca(OH)₂+ 2HCl⇒CaCl₂+2H₂O
4. Ca(OH)₂+H₂CO₃⇒CaCO₃+2H₂O
5. CaCO₃⇒CaO+CO₂
What is arcade in south Center
Answer: game stop and mind games
Explanation:
i live near there
Calculate the gravitational force between two objects when they are 0.75m apart each object has a mass of 5.00kg
Answer:
0.000000000666863
Explanation:
F = GMm/R²
carbon and tin are both in the fourth column of the table which would you expect to have the greater electronegativity
Answer: Carbon
Explanation:
electronegativity decreases when you go down a column
The study of chemical bonds is called chemistry.
The correct answer is carbon.
The more negative charge present on an atom shows the electronegativity.
The attraction of the nucleus to the proton is also referred to as electronegativity.
The smaller the radius more the electronegativity.
Hence, the correct answer is Carbon as it has fewer atoms and a smaller radius.
For more information, refer to the link:-
https://brainly.com/question/12985618
Calculate the speed for a car that went a distance of 150 kilometers in 2 hours time. btw this is science
Answer:
The speed of the car is 75 km per hour
Explanation:
Speed is distance over time so 150 km divided by 2 hours is 75km per hour.
Please mark brainliest!!! Thanks.