Answer:
A
Explanation:
this should be obvious if you read it haha
25g of potassium nitrate are dissolved in 100g of water. What is the percent by mass of potassium nitrate?
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.
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 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:
my mom is making SPAGET
Answer:
yes
Explanation:
Identifies at least one organism
that goes through photosynthesis
or respiration
A. 6750 J
B. 387 J
C. 1935 J
D. 3.50 J
Answer:
It was answer
A)1935J
Explanation:
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.
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
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
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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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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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
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:
Which laboratory activity involves a chemical change?
Answer:
It is the first one.
Explanation:
Because yeah.
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
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 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.
How much mass of sodium chloride ( ) should be dissolved in water to make 1.5 L of 0.75 M aqueous solution? The molar mass of is 58.5 g.
Answer:
Mass = 65.8 g
Explanation:
Given data:
Mass of sodium chloride = ?
Volume of solution = 1.5 L
Molarity of solution = 0.75 M
Solution:
Number of moles of sodium chloride:
Molarity = number of moles / volume in L
By putting values,
0.75 M = number of moles = 1.5 L
Number of moles = 0.75 M × 1.5 L
Number of moles = 1.125 mol
Mass of sodium chloride:
Mass = number of moles × molar mass
Mass = 1.125 mol × 58.5 g/mol
Mass = 65.8 g
A mole of any substance contains ___ particles.
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.
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 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:
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
can bees really fly if so why
A 3.5 kg iron shovel is left outside through the winter. The shovel, now orange with rust, is rediscovered in the spring. Its mass is 3.7 kg. How much oxygen combined with the iron?
Fe + O2 ⟶FeO2⟶FeO2,As we can see our compound is FeO2FeO2 which is a simple combination with the same stoichiometry, so we will just do a subtract operation : 3.7 kg - 3.5 kg $= 0.2 \ \text{kg} \Rightarrow 0.2\color{#4257b2}{0} $ kgkg (respecting significant figures rule).
What does iron and oxygen together mean?Rust is the result of an iron and oxygen interaction together:It's an ionic since it is made up of the a metal and something that is not a metal.
Iron may rust even without water?Without water, rust cannot develop.Iron pipes frequently rust on the inside due to water vapor condensation on the metal.Moisture facilitates the electrolyte required for the reaction iron take place, which expedites the rusting process.
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Please answer this...
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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What is the base name for the following compound?
C-C-C-C-C=0
Answer:
Ethanoic Acid
Explanation: