Answer:
+6
Explanation:
Observe the following images. Which of them shows a chemical change happening?
I is rusting car, II is water boiling, III is cooking eggs and IV is melting ice cream
A. I
B. I and III
C. II and IIII
D. I, II, and III
Answer: B
Explanation:
I. Rusting is a chemical reaction which is oxidation of iron.
II. Boiling water is a physical change. There is no chemical change between H2O molecules. It only shifts to the gas state from the liquid state.
III. When egg is cooked proteins are denaturated so it changes interactions between molecules.
IV. Melting is also just a phase change like boiling.
The bacteria are known to be prokaryotes. Prokaryote means
A
organisms whose cells have no nucleus
B
organisms who are made of many cells
C
organisms who make their own food
D
organisms whose cells have a nucleus
Answer:
prokaryote, also spelled procaryote, any organism that lacks a distinct nucleus and other organelles due to the absence of internal membranes. ... Bacteria are among the best-known prokaryotic organisms. The lack of internal membranes in prokaryotes distinguishes them from eukaryotes.
Explanation:
A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?
The sodium ion is negative, and the hydroxide ion is positive.
The sodium ion is positive, and the hydroxide ion is positive.
The sodium ion is positive, and the hydroxide ion is negative.
The sodium ion is neutral, and the hydroxide ion is neutral
The two ions present in the solution are:
1. Sodium ion, Na⁺
2. Hydroxide ion, OH¯
The correct answer to the question is the 3rd option. The sodium ion is positive, and the hydroxide ion is negative.
Ions are atoms or group of atoms which possess an electric charge.
Aqueous Sodium hydroxide, NaOH contains sodium ion and hydroxide ion.
The sodium ion is positive while the hydroxide ion is negative as illustrated below:
NaOH(aq) —> Na⁺(aq) + OH¯(aq)
From the illustration above, we can conclude that the correct answer to the question is the 3rd option. The sodium ion is positive, and the hydroxide ion is negative.
Please see attached photo for further details
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If substances B and C are both in the gas phase and are at the same energy level, which of the two substances will need to have more energy transferred out in order to change to the liquid phase? Substance B or Substance C? Explain your answer below.
For Science
Answer:
Substances can change phase—often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.
The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance. It requires energy for a solid to melt into a liquid. Every pure substance has a certain amount of energy it needs to change from a solid to a liquid. This amount is called the enthalpy of fusion (or heat of fusion) of the substance, represented as ΔHfus. Some ΔHfus values are listed in Table 10.2 “Enthalpies of Fusion for Various Substances”; it is assumed that these values are for the melting point of the substance. Note that the unit of ΔHfus is kilojoules per mole, so we need to know the quantity of material to know how much energy is involved. The ΔHfus is always tabulated as a positive number. However, it can be used for both the melting and the solidification processes as long as you keep in mind that melting is always endothermic (so ΔH will be positive), while solidification is always exothermic (so ΔH will be negative).
1. 4Na + 02 → 2Na20
find the reaction
oxidation reaction
Explanation:
2 Na2O → 4 Na + O2
This is an oxidation-reduction (redox) reaction:
4 NaI + 4 e- → 4 Na0(reduction)
2 O-II - 4 e- → 2 O0(oxidation)
Na2O is an oxidizing agent, Na2O is a reducing agent.
What is the difference between a conductor and an insulator?
Answer:materials that impede the free flow of electrons from atom to atom and molecule to molecule.
Answer:
conductores can flow easily through the electrical component while the insulators not
What is the molarity when 500mL H2O is added to 20mL 6.0M HNO3?
Answer:
50.00-mL volumetric flask and diluted to the mark with water. What is the molarity of the new solution? 12. 30.00 mL of water is added to 20.00 mL of 0.0500
Explanation:
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~Zero
The overall shape of a plant cell is most directly related to which of its parts?
Answer: Cell wall
Explanation: Cell wall is a unique structure found only in some specific organisms like plants, bacteria, fungi etc. The cell wall in plants is predominantly made up of a polysaccharide called CELLULOSE. This carbohydrate confers upon the cell "rigidity".
The cell wall is an additive material including the cell membrane that coats the external part of the cell of plants, hence, it gives plant cells their characteristic shape. The cell wall contributes to the overall flexible but rigid shape of the plant cell, protecting the cell against physical or chemical stresses.
Please help
How do we read chemical formulas?
Answer:
Download Science All formulasExplanation:
Hope it helpsdo Plants and animals create energy the same way?
Answer:
Yes
Step By Step Explanation:
Plants extract energy from food molecules the same way animals do — by cellular respiration.
Most, if not all plants are producers, and they make their own food using sunlight and raw materials, through a process called "photosynthesis". ... Plants get their energy in form of starch whereas animals get it in form of glycogen. Animals get their energy from the food they eat. Animals depend on other living things for food. Some animals eat plants while others eat other animals. This passing of energy from the sun to plants to animals to other animals is called a food chain.
Animals obtain energy from the food they consume, using that energy to maintain body temperature and perform other metabolic functions. Glucose, found in the food animals eat, is broken down during the process of cellular respiration into an energy source called ATP.
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Write the chemical formulas and names for the following ionic compounds. Tin4+ and chlorine
Answer:
SnCl4.
Explanation:
Why is the molecule not an example of a cis stereoisomer
Answer:
Because in order to have cis or trans configuration both carbon of alkene need to have a hydrogen
1. If the surface area of liquid is large then evaporation will be
A. small
B. large
C. moderate
D. slow
1. If the surface area of liquid is large then evaporation will be
A. small
B. large
C. moderate
D. slow
Answer:-B. Large
Explanation:-Evaporation increases with increasing surface area. This is because the greater the surface area (exposed to the air), the more molecules escape into the air.
More surface area = Higher rate of evaporation.
Which is the pathway of light as it travels through the eye?cornea → iris → retina → lenscornea → iris → lens → retinairis → cornea → lens → retinaretina → lens → iris → cornea
Answer:
Cornea >iris>lens >retina
Explanation:
Can't exactly figure out the answer but I think it should look like this
Answer: cornea → iris → lens → retina
Explanation: I have my ways ;>
¿Cómo pueden los padres pasar a sus
hijos rasgos como el color de ojos?
Answer:
Los padres transmiten rasgos o características, como el color de ojos y el tipo de sangre, a sus hijos a través de sus genes. Algunas condiciones de salud y enfermedades también pueden transmitirse genéticamente. A veces, en
How do i find a ionic formula?
for example Ca2+ & S2-
Example #1 write the chemical formula for Calcium Oxide
Step 1
-Find the Atomic symbol of the metal and non-metal on the periodic table
CaO
Step 2
Find the charges for Calcium and Oxygen
which are Ca 2+ and O 2-
Step 3
Balance out the charges
They are already balanced out
Here´s the chemical formula for Calcium Oxide
CaO
Example 2 write the chemical formula for Aluminum Oxide
Step 1
-Find the Atomic symbol of the metal and non-metal on the periodic table
A
l
O
Step 2
Find the charges for Aluminum and Oxygen
Which are Al 3+ and O 2-
Step 3
Balance out the charges
You need 2 Aluminum and 3 Oxygen to balance the charges
Al 3+ O 2-
Al 3+ O 2-
= 6 + O 2-
= 6-
Step 4
If you need more then one element to balance out the charges you identify that by using subscripts
Heres your chemical formula for Aluminum Oxide
[tex]Al_{2} O_{3}[/tex]
What is formed if two or more atoms join together?
A. Compound
B. Electronegativity
C. Nucleus
D. Element
HELP
Answer:
compound
Explanation:
compound = A substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule.
An aqueous solution has a volume of 2.0 L and contains 36.0g of glucose. If the Molar Mass of glucose is 180g/mol, what is the molarity of the solution
Convert grams of Glucose to moles of Glucose and then solve for Molarity
show all work.
Answer:
moles = 36/180 = 0.2 moles
molarity = 0.2/2 = 0.1 mol/dm3
Am I right? Yes or no?
Answer:
yes because it is right and because
Answer: The answer is true.
Explanation: You picked 1 5 6 9 which is correct, I think you picked that but I can't see
As the ionic compound increases in
complexity, the melting point
A. increases
B. decreases
C. stays the same
Given what we know, we can confirm that as an ionic compound grows more complex, its melting point will increase.
What is an Ionic compound?An ionic compound is one in which atoms of elements share electrons between them to form compounds.These shared electrons generate powerful electrostatic forces that we refer to as ionic bonds. Electrostatic forces cause an increase in the melting point of a compound. As a compound grows more complex and adds more elements to its composition, it will gain new electrostatic forces, and thus increase its melting point.Therefore, as an ionic compound grows more complex, its melting point will increase due to the increasing number of strong electrostatic forces present in the compound.
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Answer: it INCREASES
if you don’t wanna read that long answer the other person put
Explanation:
A high viscosity liquid will
Answer: high viscosity fluids move sluggishly and resist deformation.
Explanation: some examples of high viscosity liquids is Honey, syrup, motor oil, and other liquids that do not flow freely
why is xenon monatomic but bromine is diatomic
HELP WAAAAAAAAAAAAAAA
Answer:
5. 0.02 seconds
6. (a) 0.0167 seconds
(b) Period in Lebanon is 0.02 seconds and in the U.S 0.0167 seconds. That means that the U.S. has the faster period.
Explanation:
When no more solute will dissolve in a solvent, the solution is_________.
Answer:
saturated solution because it can only dissolve upto fixed temperature
Answer:
Saturated
Explanation:
Explanation from online:
"When the solution equilibrium point is reached and no more solute will dissolve, the solution is said to be saturated. A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved."
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When you knock on a door, what causes you to hear a sound?
Vibrations that cause bound beams
Vibrations that cause sound waves
Vibrations that cause sound circles
Vibrations that cause sound
Answer: B.
Explanation:
Figure 1
Describe how a frog grows. Why do you think the eggs are found in the water? Where do you think fertilization happens?
The process of fertilization occurs externally in frogs.
Stages of lifecycleA full growth of frog occurs when it passes through five stages of its life cycle. During a frog's metamorphosis, an egg will hatch and a tadpole appear in which the back legs emerge first, then front legs, and finally it become a full grown adult frog.
Eggs of frogA frog's eggs are found in water because they do not have a hard protective shell like birds and reptiles. The frog's eggs are covered with a glycoprotein, which helps to keep the eggs moist so that's why the frog lays its eggs in water in order to prevent them from drying.
FertilizationIn most species of frogs, fertilization occurs externally. The male frog grabs the female's back and fertilizes the eggs as the female frog releases the eggs. Those eggs which receives the sperm will fertilized so we can conclude that the process of fertilization occurs externally in frogs.
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what is mass tbh pls he;p
Answer:
how much matter is in an object
Explanation:
(cwater=4.18 J/g°C)
A
1,254 J
B
1,672 J
C
2,926 J
D
4,598 J
Answer:
WHAAAAAAAAAAAAAAAAAAAAT
Explanation:
Which of the following outcomes is a benefit of conventional agriculture?
Answer:
Preserving soil, water and energy resources has enabled modern farming to grow food sustainably on the same land for more than 100 years. ... Modern, conventional agriculture has key sustainability benefits in terms of land use, reduced soil erosion and water protection.
Explanation:
hope it helps you
How many moles are in 9.12 x 1023 molecules of sugar?
Answer:
1.514 moles
Explanation:
For this problem you want to use dimensional analysis and cancel out your molecules of sugar and be left with moles of sugar. We know that 1 mole (of anything) = 6.022 x 10 ^ 23 molecules, so we should use that conversion to help us. Start with 9.12 x 10 ^23 molecules and divide by 6.022 x 10 ^ 23 molecules, and you will be left with moles.
Hope this helps!