Answer:
c
Explanation:
A 0.85% saline solution would consist of 0.85 g NaCl made up to 100 mL of water.
A 0.85% saline solution contains 0.85% by weight of NaCl. Hence, in order to prepare such a solution, 0.85 g of NaCl is weighed out into a beaker or cylinder and distilled water is added up to the 100 mL mark. On the other hand, 8.5 g of the NaCl can be weighed out and then distilled water added to 1000 mL mark.
The correct option is, therefore, c.
Newton determined that the attractive force between two masses was DIRECTLY proportional to:
Answer:
This is Newtons 2nd Law: Force is directly proportional to the acceleration of the object, acceleration is inversely proportional to the mass of the object.
Which phrase justifies why the theory of evolution is a theory and not a law?
1. Describes the relationship between an organism and its environment
2. Makes accurate predictions based on only a small amount of empirical evidence
3. Explains diversity based on the principle of natural selection
4. Cannot be modified with the discovery of new evidence
Answer:
2. Makes accurate predictions based on only a small amount of empirical evidence
Explanation:
For a phrase or scientific finding to be considered a law, there has to be clear evidence and facts to support that specific finding. In the case of the evolution theory, the evidence is not clear enough to make it a law
Answer:
2. Makes accurate predictions based on only a small amount of empirical evidence
Explanation:
HELP please it’s due soon
Answer:
1. D
2. A
3. B
4. A
5. BB
Explanation:
1d. 50%
2a. 29.5
3b. increasing
4a. decreasing
5b. waxing
Please answer for me.
Answer:
54.5%
Explanation:
The percentage composition of oxygen in C₆H₈O₆ can be obtained as follow:
Molar mass of C₆H₈O₆ = (12×6) + (8×1) + (16×6)
= 72 + 8 + 96
= 176 g/mol
Next, there are 6 oxygen atoms in C₆H₈O₆. Therefore the mass of oxygen in C₆H₈O₆ is:
Mass of Oxygen = 16 × 6 = 96 g
Finally, we shall determine the percentage composition of oxygen in C₆H₈O₆ as follow:
Percentage of oxygen =
Mass of Oxygen/mass of C₆H₈O₆ × 100
Percentage of oxygen = 96 / 176 × 100
Percentage of oxygen = 54.5%
Thus, the percentage composition of oxygen in C₆H₈O₆ is 54.5%.
A spaceship is traveling through space. Suddenly, its speed increases. What can
you say about the kinetic energy of the spaceship?
A. The kinetic energy increases as its speed increases.
B. The kinetic energy decreases as it is converted into speed.
C. The kinetic energy remains the same because speed and kinetic energy are not
related.
D.There is no way to know what happens to the kinetic energy.
Answer:
A. The kinetic energy increases as its speed increases.
Explanation:
The kinetic energy of an object is energy possessed by an object by virtue of its motion.
Now, kinetic energy of a moving body is given by;
KE = 1/2 mv^2
Where;
m = mass of the body
v = velocity (speed) of the body
It follows that if the mass of the spaceship is constant, a sudden increase in speed leads to a corresponding increase in the kinetic energy of the spaceship in accordance with the relationship show above.
Answer:
You'll speed up! A. Because the kinetic energy increases as its speed increases.
Explanation:
7th grade science , please don’t get the answer from the internet :(
Answer:
See the answer below
Explanation:
1. Organisms produce energy for cells by chemically breaking down and unlocking the energy locked-up within food materials in a process known as cellular respiration. The unlocked energy is then utilized for the cell's metabolic activities.
2. Cellular respiration can be aerobic or anaerobic.
Aerobic respiration involves the breakdown of carbohydrates in the presence of oxygen to yield energy in the form of ATP while carbon dioxide and water are produced as by-products.
[tex]C_6H_1_2O_6 + 6O_2 --> 6CO_2 + 6H_2O + ATP[/tex]
Anaerobic respiration involves the breakdown of carbohydrates in the absence of oxygen to produce ATP and lactic acid as a by-product. The lactic acid is later oxidized to carbon dioxide and water to prevent it from building up.
[tex]C_6H_1_2O_6 -> 2C_3H_6O_3 + ATP[/tex]
3. Photosynthesis and cellular respiration are both considered metabolic processes that take place in living organisms. However, photosynthesis is peculiar only to green plants and some algae while respiration is common to all living organisms. While photosynthesis is anabolic, that is, it involves the building up of materials; respiration is said to be catabolic because it involves the breaking down of materials.
During photosynthesis, inorganic products are utilized to produce carbohydrates for plants with oxygen gas released as a by-product according to the following equation:
[tex]6CO_2 + 6H_2O --> C_6H_1_2O_6 + 6O_2[/tex]
During respiration, the food taken by living organisms is broken down to unlock the energy in it for metabolic activities according to the following equation:
[tex]C_6H_1_2O_6 + 6O_2 --> 6CO_2 + 6H_2O + ATP[/tex]
Which of the following chemical formulas CANNOT be simplified into an empirical formula?
a) C4H16O5
b) N8H4F4
c) Ca2Br4
d) Mg5I10
Answer:
The answer is a) [tex]C_{4} H_{16} O_{5}[/tex]
Explanation:
The other chemical formulas' subscripts share a common factor, so they can be simplified to an empirical formula, however, the subscripts in [tex]C_{4} H_{16} O_{5}[/tex] cannot be simplified any further, because they do not share any more whole-number factors with each other.
Question 2
How does an object become negatively charged
Answer:
It gains electrons.
Explanation:
Got it right on a quiz.
When electrons are added to or taken away from an object, an electrical charge is produced. An object acquires a negative charge when electrons are introduced to it because electrons have a negative charge. An object acquires a positive charge when its electrons are removed.
When a thing picks up electrons, it becomes negatively charged. Non-metals gain electrons at the atomic level to fill their outer electron orbitals. An atom that is negatively charged and has more electrons than protons is said to be an anion.
Some atoms have the ability to draw in more electrons, making them negatively charged. Ions are defined as atoms that are not electrically neutral.
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How many molecules are in 33.6 liters of neon (Ne) gas at STP?
Answer:
moles or atoms?
Explanation:
you can't have a molecule of any so there's two different answers that I can give you:
how many moles? 1.5
how many atoms? 9.03x10^23 atoms
At STP 1 mole of an ideal gas occupies 22.4L.
33.6 L x 1 mol/22.4 L = 1.5 moles of Neon
1.5 moles Ne x 6.02x1023 atoms/mole = 9.03x1023 atoms
9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP. At STP 1 mole of an ideal gas occupies 22.4L.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.
Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.
At STP 1 mole of an ideal gas occupies 22.4L.
33.6 L x 1 mol/22.4 L = 1.5 moles of Neon
1.5 moles Ne x 6.02x10²³ atoms/mole = 9.03x10²³ atoms
Therefore, 9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP.
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Acids containing polyatomic ions are named according to the name of the anion. true or false
Answer:
true
Explanation:
Names for such acids consist of the prefix “hydro-“, the first syllable of the anion, and the suffix “-ic”. Complex acid compounds have oxygen in them. For an acid with a polyatomic ion, the suffix “-ate” from the ion is replaced with “-ic.”
what is the # of Electrons in carbon?
Answer:
Carbon dioxide (CO2)
Ethene (C2H4)
Methane (CH4)
Explanation:
Please help me answer this first question.
Answer:
I think it would be 9 moles.
Lithium is a metal,chlorine is a non metal,so LiCl would be a ______bond
a.Metallic
b.Covalent
c.Ionic
Which of the following best describes the material that makes us the mantle?
Answer:
A- a rigid solid
Explanation:
The Earths mantle is mainly made up of rock and rocks are rigid and are solid.
Cherylanne mixes together Chemical A and Chemical B in a test tube, forming Chemical C. The mixture instantly turns cool to the touch. She then adds Chemical D, and the reaction becomes hot and explodes. What can be known about this situation? Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction. Chemicals A and B form an exothermic reaction, and chemicals C and D form an endothermic reaction. Chemicals A and C form an endothermic reaction, and chemicals B and D form an exothermic reaction. Chemicals A and B form an exothermic reaction, and chemicals B and D form an endothermic reaction.
Answer:
Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction.
Explanation:
The reaction that produced chemical C is an endothermic reaction whereas, the reaction between C and D is an exothermic one.
An exothermic change is one in which heat is liberated to the surroundings. So the surrounding becomes hotter at the end of the reaction.
An endothermic reaction is a change in which heat is absorbed from the surrounding and hence the surrounding colder at the end of the change.
We can see that the first reaction is endothermic. The second reaction is exothermic.Answer:
A or 1Explanation:
Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction.the rest are wrongChemicals A and B form an exothermic reaction, and chemicals C and D form an endothermic reaction.
Chemicals A and C form an endothermic reaction, and chemicals B and D form an exothermic reaction.
Chemicals A and B form an exothermic reaction, and chemicals B and D form an endothermic reaction.
I need help :(((((((((((((((
Which of the following is NOT a product of photosynthesis?
A. glucose
B. energy
C. oxygen
D. carbon dioxide
B is the answer..............
Answer:
D. Carbon Dioxide
Explanation:
Carbon is what enters the plant. It isn't a product of the plant.
Fission U235 can produce what?
A Krypton
B Strontium
C Barium
D Xeonon
E All of the above
Answer:
A. krypton
Explanation:
give me brainly
5. Where are red blood cells produced?
10 points
O a. in the heart
b. in the blood vessels
c. in bone marrow
O d. in the plasma
Answer:
C
Explanation:
it's produced in the bone marrow
Dr. Bert Vogelstein and his partners study the causes of cancer. In 2017, they published a study of 32 types of cancer. The study concluded that most cancer cases are caused by DNA replication errors. In fact, 66% of the cancer cases they studied were caused by random DNA replication errors. Environmental factors such as diet, sunburns, and smoking caused 29% of the cancers. The last 5% of cancers in the study were caused by inherited factors.
Briefly describe the steps of DNA replication and point out one place in the code where an error can occur.
Answer:
Error or mistakes during DNA replication is accountable for two-thirds or 66% of the cancer cases. These random and unpredictable errors called mutations that occur during the division of a cell as an error in copying of DNA.
DNA replication has three main steps:
Opening and separation of DNA strands of a helix - carried by an enzyme known as helicase that breaks the hydrogen bonds between nitrogenous bases of the helix of DNA.
The priming of the template strand - DNA primase helps RNA primers to bind to both strands at 3' end as soon as it separated
strat assembling the segments of new DNA on strands called elongation of the strands with help DNA polymerase I and after forming new strands the termination of the replication.
Errors or mistakes can occasionally take place if DNA polymerase inserts a wrong base during elongation of the strands.
1. Mixing is a physical change.
True or false
Answer:
false it is a chemical change
MULTIPLE CHOICE QUESTION
Gain or Lose
Magnesium (Mg) has 2 valence electrons. Will
the Mg atom gain or lose electrons to form an
ion?
• Elements > 4 valance e-
gain e-
• Elements < 4 valance e-
lose e-
Neither
Lose
Gain
Define symbole and valeny.
Answer:
Chemical symbol
This is used to identify an element without having to write the full name and as such is a designation for the element. It is used in chemical reactions and is usually either one or two letters. Some symbols are, Iron - Fe, Hydrogen - H and Oxygen - O.
Valency
This refers to the capacity of an element to combine with another to form a compound. It is measured by the number of electrons that an atom of an element gains, looses or shares when a chemical reaction involving it takes place.
Which product of photosynthesis is mainly considered to be waste for plants, although some is used during respiration?
A. oxygen
B. carbon dioxide
C. glucose
D. energy
Answer:
A. Oxygen
Explanation:
A is the only one that makes sense because plants take in carbon dioxide, use glucose for food, and use energy to photosynthesize, and the only answer they don't use is A (oxygen) because they only produce it but not use it
what is the relationship between the thickness of the book and the ability of the magnet to hold on to and attract the paper clips?
Answer:
The thicker the metal, the harder it is for the magnet to attract more paper clips.
Explanation:
There exists a relationship between the paper and the paper clip. The more is the thickness of the paper the stronger the paper clip will be. As size has the ability to attract and affect.
In another sense the stronger is the metal of the paper clip the tighter will be the element of the magnet Thus more will be the ability of the magnet to keep hold of the paper. Hence the closer is the magnet the more is the grip.Learn more about the relationship between the thickness of the book.
brainly.ph/question/4895114.
true or false boron carbon and nitrogen I have the same valence electrons
Answer:
false
Explanation:
Because in a periodic table they are not located below each other and therefore do not have the same number of electrons.
What is the electron configuration for Ti (titanium)?
Explanation:
Titanium is an element found in the d-block group on the periodic table. It is a transition element.
To write the electronic configuration of an element, we must know the number of electrons in them;
In a titanium atom, we have 22 electrons;
Shell notation = 2 8 10 2
Orbital notation = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s²
Answer: [Ar]4s^2 3d^2
Explanation:
5. Which part makes up most of our blood vessels?
O a capillaries
Ob veins
O carteries
d. blood
Answer: a capillaries
Explanation:
Scientists were studying three different embryos to determine their relationship to humans. The notes about each embryo are shown in the chart. Based on the information, what can you determine?
Answer:
Species A and C are related to humans.
Explanation:
got it right on edge.
Answer:A. Species And C are related to humans
Explanation: In the embryo humans and other Species have gill slits, and a tail. Vestigesof tales grew and non-human ancestors. On rare occasions, aremnant of the tail through and embryological development, although this tale of course has no function. An embryos splits are found in the boreals of all vertebrates because they share a common ancestors with fish and which structures first
What is the percent composition for dihydrogen monoxide?
Answer:
I think the answer is 11.190% :)
Explanation:
Hope this helps <3