Answer:
100 milliliter
Explanation:
Initial Pressure P1 = 60 kPa
Final Pressure P2 = 120 kPa
Initial Volume V1 = 200mL
Final Volume V2 = ?
These parameters are related by the following boyle's law which is mathematically given as;
V1P1 = V2P2
Making V2 subject of interest;
V2 = V1P1 / P2
inserting the values;
V2 = 200 * 60 / 120
V2 = 100ml
why is the separation of waste rock before mining so important?
Answer:
because the minerals in the rock can't be used until they are separated
A. 6750 J
B. 387 J
C. 1935 J
D. 3.50 J
Answer:
It was answer
A)1935J
Explanation:
can bees really fly if so why
Please answer this...
A mole of any substance contains ___ particles.
An isotope of carbon has 6 protons and 8 neutrons. What is the atomic mass of this element?
6
O 12
O 12.011
O 14
Answer:
14
Explanation:
Atomic mass = protons + neutrons
6 + 8 = 14
I do not know the answer. Please help
What pieces of evidence do scientists use to support the current theory of rapid expansion?
I am sorry I don't know, points are points though
Copper carbonate (CuCO3) reacts with hydrochloric acid (HCl) according to this equation:
CuCO3(s) + 2HCl(aq) → CuCl2(aq) + H2O(l) + CO2(g).
Which statement correctly describes the substances in this reaction?
A.
Exactly one product and two reactants are either liquid or dissolved in water.
B.
Exactly one of the reactants is in a water-based solution, but none of the products are.
C.
The reactants include both a liquid and a gas.
D.
Exactly one reactant is a solid, and exactly one product is a gas.
E.
The products include a solid, a liquid, and a gas.
Answer: D. Exactly one reactant is a solid, and exactly one product is a gas.
Explanation: PLATO
In the given reaction, there is only one reactant in solid state, that is copper carbonate and one gaseous product carbon dioxide. Hence, option D is the correct statement.
What is copper carbonate?Copper carbonate is an ionic compound formed by the combination of copper metal and carbonate group. Copper metal loses two electrons to the carbonate group. It is a white powder and sparingly soluble in water.
The states of reactants and products in a reaction is represented in brackets with the chemical formula of each compound. The reaction in which all the reactants are in same phase is called homogeneous.
The given reaction is an example of heterogeneous replacement reaction. The reaction includes the combination of solid copper carbonate with aqueous HCl giving copper chloride solution and carbon dioxide gas. Thus, option D is correct.
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What is the empirical formula for propene (C3H6)?
C2H4
O C4H8
O C3H6
O CH2
Answer:
D) CH2
Explanation:
The empirical formula of propene is CH₂ as it has chemical formula of C₃H₆ which on division of subscripts give empirical formula as CH₂.
What is empirical formula?Empirical formula of a compound is defined as the simplest whole number ratio of atoms which are present in a compound.It does not make any mention of the arrangement of atoms or the number of atoms. The empirical formula gives information about the ratio of number of atoms which are present in a compound.
Molecular formula is determined from the empirical formula by dividing the molar mass of a compound by the empirical formula mass. The resultant which should be a whole number or very close to the whole number , then the subscripts are multiplied by the whole number to get the molecular formula.
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calculate the mass in gram of binormal solution in NAOH
Answer:
80 grams
Explanation:
Normality is one of the units of concentration and it is derived by dividing the gram or mole equivalent of the solute in a solution by the volume (in liters) of the solution.
The equivalent weight of NaOH is derived by dividing the molecular weight of the compound by 1. Hence, the equivalent weight of NaOH in 1 normal solution is 40/1 = 40 g.
If 1 normal NaOH solution contains 40 g of NaOH in 1 liter of the solution, then a binormal (2 normal) solution of NaOH would contain;
2 x 40 = 80 g of NaOH.
Which laboratory activity involves a chemical change?
Answer:
It is the first one.
Explanation:
Because yeah.
A bicycle weighs 780. pounds. If the pressure exerted by its
tires on the ground is 30.5 pounds per square centimeter, what
is the area of one of the two tires that's in contact with the
road? (This will be half as much as the pressure exerted by
both tires.)
Answer:it’s 12.8cm^2 and I saw that last anwser and he’s not wrong but yeah I had trouble figuring it out but it’s just force divided by area for both tires multiply that by 2
Explanation:
A bicycle weighs 780. pounds. If the pressure exerted by its tires on the ground is 30.5 pounds per square centimeter, the area of one of the two tires that's in contact with the road is 12.8cm².it’s just force divided by area for both tires multiply that by 2.
What is pressure ?Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is distributed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units.
Pressure is defined as force per unit area of surface; the SI unit of pressure is the pascal (Pa), which is defined as one newton per square metre (N/m2). An object's pressure is proportional to the force it exerts and inversely proportional to the area over which the force is exerted.
The physical force exerted on an object is defined as pressure. The force applied per unit area is perpendicular to the surface of the objects. F/A is the basic pressure formula (Force per unit area).
Thus, the area of one of the two tires that's in contact with the road is 12.8cm².
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Which of the following statements is correct?
Group of answer choices
Water and nitrogen are both compounds.
Water and nitrogen are both elements.
Water is an element and nitrogen is a compound.
Water is a compound and nitrogen is an element.
Answer:
water is a compound and nitrogen is an element
Explanation:
water is a compound and also a molecule because it is a combination of two different element, while nitrogen is an atom or an element
Answer: Water is a compound and nitrogen is an element.
Explanation:
Water = H20 = 2 Hydrogen atoms and 1 Oxygen atom
Nitrogen (N) element of Group 15 of the periodic table
give two example for desert plants and animals?
please mark as brainliest
Answer:
Plants : Cactus, tumbleweed
Animals : camel, fennec fox
Answer:
Desert plant - Cactus & Tumbleweed
Desert animal - Camel & Scorpion
How many molecules of HCl would react with 1 mole of Mg0?
Mg0 +2HCI
MgCl, + H,0
Answer:
12.044 ×10²³ molecules of HCl
Explanation:
Given data:
Number of moles of MgO = 1 mol
Number of molecules of HCl react = ?
Solution:
Chemical equation:
MgO + 2HCl → MgCl₂ + H₂O
with 1 mole of MgO 2 moles of HCl are react.
Number of molecules of HCl react:
1 mole contain 6.022×10²³ molecules
2 mol × 6.022×10²³ molecules / 1 mol
12.044 ×10²³ molecules
An object at rest has equal forces acting on it. This can be described as a(n) ______ force.
Answer:
it would be balanced forces.
Explanation:
Balanced forces acting on an object do not change the objects motion.
Identifies at least one organism
that goes through photosynthesis
or respiration
How do metals and non-metals for ions?
Answer:
Metal atoms and non-metal atoms do different things when they ionise. Metal atoms lose the electron, or electrons, in their highest energy level and become positively charged ions. Non-metal atoms gain an electron, or electrons, to become negatively charged ions.
Explanation:
Which of the following is described by the equation H20(1) + heat → H2O(g)?
A. Freezing
B. Condensing
C. Evaporating
D. Melting
Explanation:
When water changes state from liquid to gas, this is Evaporation. (C)
When you apply heat to liquid water it will convert into gas. This process is called evaporation.
What is the base name for the following compound?
C-C-C-C-C=0
Answer:
Ethanoic Acid
Explanation:
Adenosine triphosphate is the:
A. mitochondria
B. energy molecule
C. chloroplast
D. cellular respiration
Answer:
B. Energy Molecule
Explanation:
Adenosine triphosphate, or ATP, is the primary carrier of energy in cells. The water-mediated reaction known as hydrolysis releases energy from the chemical bonds in ATP to fuel cellular processes. Adenosine triphosphate (ATP), energy-carrying molecule found in the cells of all living things.
Answer:
B. Energy Molecule
Explanation:
It is used for storing and transferring energy in cells.
C2H6O2 is infinitely miscible(soluble) in water. Ethylene glycol is a nonelectrolyte that is used as antifreeze. What is the lowest possible melting point for engine coolant that is 30% ethylene glycol? The Kf for H20 is 1.86 C/m.
Answer:
The lowest possible melting point for engine coolant is -12.8°C
Explanation:
This is about colligative property about freezing point depression.
We think the data 30% as a %m/m. It means that 30 g of ethylene glycol are contained in 100 g of solution. Therefore, we have 70 g of solvent.
Formula for freezing point depression is:
ΔT = Kf . m . i
Where ΔT = Freezing T° of pure solvent - Freezing T° of solution.
Freezing T° of solvent = 0° (We talk about water)
Let's determine m (molality, moles of solute in 1kg of solvent)
70 g = 0.070 kg
30 g . 1 mol / 62.07 g = 0.483 moles
0.483 mol / 0.070 kg = 6.90 m
We replace data in formula:
0° - Freezing T° of solution = 1.86 °C/m . 6.90m . 1
As ethylene glycol is a nonelectrolyte, i = 1
Freezing T° of solution = - 12.8°C
25g of potassium nitrate are dissolved in 100g of water. What is the percent by mass of potassium nitrate?
Which statement best describes an example of selective breeding?
5
A. People control how plants or animals reproduce to get desired
traits.
OB. People use enzymes to cut DNA, copy it, and paste pieces of it
back together.
O. Viruses deliver new genes to a person's cells to treat a genetic
condition.
OD. Living things that do well in an environment pass on their genes to
offspring.
Answer:
Answer is A
Explanation:
this is because selective breeding means selecting plants or animals having desired characteristics and let them breed with each other to reproduce an offspring having desired characteristics from both parents.
Answer:
A
Explanation:
What is specific heat a measure of?
O A. How much energy it takes to break chemical bonds
B. How much energy it takes to heat a substance
C. How much energy it takes to vaporize a substance
D. How much energy it takes to melt a substance
Answer:
B. How much energy it takes to heat a substance
Explanation:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
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
The substances with higher value of specific heat capacity require more heat to raise the temperature by one degree as compared the substances having low value of specific heat capacity. For example,
The specific heat capacity of oil is 1.57 j/g. K and for water is 4.18 j/g.K. So, water take a time to increase its temperature by one degree by absorbing more heat while oil will heat up faster by absorbing less amount of heat.
Consider that both oil and water have same mass of 5g and change in temperature is 15 K. Thus amount of heat thy absorbed to raise the temperature is,
For oil:
Q = m.c. ΔT
Q = 5 g× 1.67 j/g K × 15 K
Q = 125.25 j
For water:
Q = m.c. ΔT
Q = 5 g× 4.18 j/g K × 15 K
Q = 313.5 j
we can observe that water require more heat which is 313.5 j to increase its temperature.
what does the pH scale for acids and bases range from?
Answer:
Anything below 7.0 is acidic, and anything above 7.0 is alkaline, or basic. pH scale, ranging from 0 (very acidic) to 14 (very basic/alkaline) and listing the pH values of common substances.
Explanation:
PRESS THE CROWN
The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.
Explanation:
Please help me I need to pass my class
Answer:
chickens
Explanation:
we are more related to chickens as for we dont fly such like bats. chickens genes are closer to us. we cant be able to be upside down as long as bats can and we dont have their really good r=hearing either.
How do the products of chemical reactions compare to their reactants? Question 7 options: The products usually weigh more than the reactants. The products often have completely different properties than the reactants. The products usually have more atoms than the reactants. The products are usually more toxic than the reactants
Answer:
The second choice.
Explanation:
The products often have completely different properties than the reactants.
The first and third are wrong because matter is always preserved in a chemical reaction.
The last is not true.
my mom is making SPAGET
Answer:
yes
Explanation:
The integumentary system functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. Which organelle performs the same function as the integumentary system?
Cell membrane
Mitochondria
Nucleus
Cell wall
The integumentary system functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. Cell membrane performs the same function as the integumentary system. Therefore, option A is correct.
What is cell membrane?The cell membrane performs a function that is similar to the integumentary system. The cell membrane is a thin, flexible layer that surrounds the cell and acts as a barrier between the cell and its external environment.
It helps to regulate the movement of substances in and out of the cell, maintain the balance of fluids and electrolytes, and protect the cell from harmful substances.
The cell membrane can also play a role in temperature regulation, as it helps to maintain the proper internal environment of the cell.
Thus, option A is correct.
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