Answer:
The answer is: A
Explanation:
The wave-like contractions are to be considered a physical change as they do not take part in the breaking-down of the food. The peptidase is a chemical change because it is used to chemically break down the food to retrieve nutrients and such.
What is formed when atoms of elements combine? (5 points)
оа
Compounds
Ob
Electrons
ос
Protons
Od
Neutrons
Answer:
Its compounds
Explanation:
the Central value of the set of observation is called.
Answer:
The central value of the sets of observation can be mean, median or mode depending upon the kind of data provided as all are measure of central tendency.
Explanation:
7th grade science , help me please :))
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
if you start with 55 grams of sodium flouride naf how many grams of magnesium fluride mgf2 will be produced
Answer:
Mass of MgF₂ formed = 40.5 g
Explanation:
Given data:
Mass of NaF = 55 g
Mass of MgF₂ formed = ?
Solution:
Chemical equation:
2NaF + Mg → MgF₂ + 2Na
Number of moles of NaF:
Number of moles = mass/molar mass
Number of moles = 55 g / 41.98 g/mol
Number of moles = 1.3 mol
now we will compare the moles of sodium fluoride with magnesium fluoride.
NaF : MgF₂
2 : 1
1.3 : 1/2×1.3 = 0.65 mol
Mass of magnesium fluoride:
Mass = number of moles × molar mass
Mass = 0.65 mol × 62.3 g/mol
Mass = 40.5 g
Help ASSSAPPPP I WILL MARK BRAINLIEST. What is the outer electron configuration for tin?
Answer:
hope this helps!
Name 3 types of rock on Planet Earth.
Answer:
igneous, sedimentary, and metamorphic
Explanation:
Answer:
IGNEOUS ROCKS form when molten rock (magma or lava) cools and solidifies. SEDIMENTARY ROCKS originate when particles settle out of water or air, or by precipitation of minerals from water.
And METAMORPHIC (I dont have nothing for this won)
Explanation:
uses of hydrogen?.......
Explanation:
Uses of hydrogen :
It can be used as rocket fuel. It can be used for welding It can be used for the production of hydrochloric acid.It can also be used to generate electricity.Hope it Helps.
What is the bond angle that corresponds to the
geometry associated with C1 in the structure?
A. 120° B. 90O
C. 1800
D. 109.5o
7. Between which bonded elements in the above
structure is there the strongest dipole moment?
A. Carbon to Carbon B. Hydrogen to Carbon
C. Oxygen to Carbon D. Oxygen to Hydrogen
8. What is the geometry associated with the C2 molecule in the structure?
A. linear B. trigonal planar C.bent D. tetrahedral
9. Among the choices below, which correctly describes the bonding taking place in the above structure?
A. 6 sigma bonds, 1 pi bond C. 6 sigma bonds, 2 pi bonds
B. 7 sigma bonds, 1 pi bond D. 7 sigma bonds, 2 pi bonds
why is ketchup a physical change
Answer:
Ketchup is not a change, it is a sauce.
Explanation:
Answer:
There is no change in the tomatos structure its "state of matter" you could say is changed, but the actual chemical compoud is the same.
Minerals from water pass through the mold and over time the minerals fill that mold and it then becomes a cast in the same shape of the body of the animal that died?
True
False
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
The curved upper surface of a liquid in a column of liquid?
Answer:
The answer would be meniscus.
Which two statements are true about redox reactions?
A. They include both oxidation and reduction reactions,
B. Electrons are transferred.
C. They are double-replacement reactions.
D. They are acid-base reactions,
Answer:
A. They include both oxidation and reduction reactions AND B. Electrons are transferred.
Explanation:
a p e x
The statements that are true about redox reaction are:
A. They include both oxidation and reduction reactions,
B. Electrons are transferred.
What is a redox reaction?The Redox reaction is the one in which oxidation and reduction take place simultaneously. In this process transfer of electrons takes place which further leads to oxidation or reduction.
Thus, options A and B are correct.
Find more information about Redox reaction here:
brainly.com/question/21851295
The number of molecules in 48.0 grams of oxygen gas (O2) is...
O 6.02 x 1023
O 1.81 x 1024
O 1.20 x 1024
9.03 x 1023
Answer:
9.033 × 10²³ molecules
Explanation:
Given data:
Mass of oxygen = 48.0 g
Number of molecules = ?
Solution:
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 48.0 g/ 32 g/mol
Number of moles = 1.5 mol
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
1.5 mol × 6.022 × 10²³ molecules / 1mol
9.033 × 10²³ molecules
A 500 mL sample of drinking water contains 0.001 mg of mercury. How many ppb is this?
Answer:
The value is [tex]k = 2 \ ppb[/tex]
Explanation:
From the question we are told that
The volume of the drinking water is [tex]V = 500 \ mL = 500 *10^{-3} \ L = 500 *10^{-6} \ m^3[/tex]
The mass of mercury it contains [tex]m_c = 0.001 \ mg = 0.001 *10^{-3} \ g = 0.001 *10^{-6}\ kg[/tex]
Generally the mass of water is mathematically represented as
[tex]m = V * \rho[/tex]
Here [tex]\rho[/tex] is the density of water with value [tex]\rho = 1000 \ kg/m^3[/tex]
So
[tex]m = 500 *10^{-6 }* 1000[/tex]
=> [tex]m = 0.5 \ kg[/tex]
Generally ppb mean part per billon , and 1 billon is 100,000,000
So the part per billon which this represents is mathematically represented as
[tex]k = \frac{0.001 *10^{-6}}{ 0.5} * 100 000 000[/tex]
=> [tex]k = 2 \ ppb[/tex]
Answer:
2 ppb
Explanation:
I got it right in class!
Hope this Helps!! :))
Which of the following is a physical change:
a. turning solid sodium to and chlorine gas to salt
b. forming a mixture
c. food turning into waste in the intestines
d.burning wood
PLEASE HELP
The area in which you live has a particular climate. It also has weather. Which claim describes the difference between climate and weather?
Group of answer choices
Weather is determined by temperature and precipitation, whereas climate is determined only by humidity, air pressure, and wind conditions.
Climate is the condition of Earth’s atmosphere at a particular time and place, whereas weather is the characteristic climate in an area over a long period of time.
Climate is determined by temperature and precipitation, whereas weather is determined only by humidity, air pressure, and wind conditions.
Weather is the condition of Earth’s atmosphere at a particular time and place, whereas climate is the characteristic weather in an area over a long period of time.
Answer:
Weather is the condition of Earth’s atmosphere at a particular time and place, whereas climate is the characteristic weather in an area over a long period of time.
Explanation:
Weather and climate are two very important conditions that describes the atmospheric overview of a place.
Weather is reported over a short period of time, it is the condition of the atmosphere at a particular time and place.
Climate is reported over a long period of term. The average weather condition of a place over a long period of time is the climate.
The most important control over the climate of a place is the temperature and amount of precipitation it receives over a period of time. Weather conditions is reported using more diverse factors such a temperature, pressure, humidity, precipitation, etc.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
Please help me with this question
Answer:
Moon
Explanation:
A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction?
Question 4 options:
A Hot water heated the aluminum foil.
B The liquid solution changed color.
C The pan was lined with aluminum foil.
D The hot water cooled.
Answer:
c lined with aluminum foil
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.
Write the structure of the following compound:
=> 3-(4-chlorophenyl)-2-methylpropane
Answer:
See explanation and image attached
Explanation:
The IUPAC system of nomenclature enables the structure of molecules to be written seamlessly from the name of the compound. Hence it is commonly called the systematic nomenclature.
The parent chain here is propane. It is substituted at the 2- position by a methyl group and at the 3-position by 4-chlorophenyl group as we can see in the image attached to this answer.
Ralph wanted to breed a pea plant that produced only purple flowers. He continued to breed purple-flowers producing pea plants together over six generations. The results of Ralph's artificial selection are shown above. What did artificial selection do the population of pea plants?
Answer:
B
Explanation:
Number of purple flowers
Number of white flowers
1
705
224
2
792
189
3
834
102
4
889
84
5
938
21
6
952
0
Ralph wanted to breed a pea plant that produced only purple flowers. He continued to breed purple-flower producing pea plants together over six generations. The results of Ralph's selective breeding are shown above. What did the selective breeding do to the population of pea plants?
A. increased its genetic diversity
B. decreased its genetic diversity
C. caused a new species of pea plant to form
D. caused a pea plant to exhibit a new characteristic
The correct answer would be that selective breeding decreased the genetic diversity of the population of the pea plants.
The genetic diversity of a population can be viewed as the number of genes in the gene pool of the population.
With each successive generation, more purple-flowered and less white-flowered pea plants were being produced until the 6th generation when only purple-flowered pea plants were produced. The ratio of the purple color gene to that of white color kept increasing until there was no longer a white color gene in the population. Hence, the genetic diversity of the population was decreased by the selective breeding.
The correct option is B
Explain why it is important for cells to exchange materials.
Answer:
they need the exchange so they can grow, obtain energy, and get rid of waste. It also helps to mantian a balance of amterials in the cell.
Explanation:
Which of the following changes would double the force between two charged particles
Answer:
Decreasing the distance between the particles by a factor of 2
Explanation:
To double the force between the two charge particles, the distance between the particles should be reduced by a factor of two.
According to coulombs law "force is directly proportional to the potential between the two charges and inversely proportional to the square of their distances".
F = [tex]\frac{kq_{1} q_{2} }{r^{2} }[/tex]
F is the electric force
k is the coulomb constant
q is the charge
r is the distance or separation
As the separation between the charges is reduced the force increases and vice versa
Answer:
A
Explanation:
A. P. E. X.
In a competition, an athlete throws a discus though the air. What was the average speed of the discus if it traveled 107 meters over a time of 12 seconds?
Answer:
8.92 m/s
Explanation:
Distance covered = 107 m
Time = 12 s
Average speed = ?
The relationship between the parameters is given by;
Average speed = Distance covered / Time
Average speed = 107 / 12
Average speed = 8.92 m/s
How does the concept of action- reaction apply to the human body?
Answer:
The physical body of human work accosting to Action-Reaction law.
Explanation:
The rule of action-reaction state that an equivalent and reverse reaction occurs with any action. If one entity imposes force on a second entity, the second responds by exerting an equivalent force on first entity in the same direction.
Please help me answer Question 1.
Answer:
9 moles of oxygen are produced from 6 moles of potassium chlorate.
Explanation:
Given data:
Number of moles of KClO₃ = 6 mol
Number of moles of oxygen produced = ?
Solution:
Chemical equation:
2KClO₃ → 2KCl + 3O₂
now we will compare the moles of KClO₃ and O₂.
KClO₃ : O₂
2 : 3
6 : 3/2×6 = 9
Thus, 9 moles of oxygen are produced from 6 moles of potassium chlorate.
What is the base name for the following compound?
C-C-C-C-C=0
Answer:
Ethanoic Acid
Explanation:
