Answer: 1) True
2) False 4)False 5)True
Explanation: I took a test that had similar questions
Burning fuels such as hydrocarbons is useful because it releases light and what kind of energy?
Answer: Hydrocarbon fuels like methane (CH4) burn in the presence of oxygen to produce carbon dioxide and water. This process of combustion releases energy. When energy is released during the course of a chemical reaction, it is said to be an EXOTHERMIC reaction.
Explanation:
Burning fuels such as hydrocarbons are useful because it releases light and it is said to be an exothermic reaction.
What is a hydrocarbon?A hydrocarbon is an organic compound consisting of hydrogen and carbon found in crude oil, natural gas, and coal.
Hydrocarbon fuels like methane ([tex]CH_4)[/tex] burn in the presence of oxygen to produce carbon dioxide and water. This process of combustion releases energy.
When energy is released during the course of a chemical reaction, it is said to be an exothermic reaction.
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4. After virtual school you decide to make a milkshake. You know that the best
milkshake is made with 500 ml of milk and 120 g of chocolate ice cream.
Chocolate ice cream weighs 0.6 g/ml. How many liters of ice cream should you
add?
120 ml
2401
O 0.21
4.0 di
Answer:
The answer actually isn't all that complicated. 120 grams is equivalent to 120 milliliters, and 120 milliliters is equal to 0.21 liters, since you divide 120 by 1000.
which non metallic element is an essential constituent of nervous and muscular tissue?
Answer:
Phosphorus
Explanation:
The nonmetallic element, phosphorus, can be found in the tissues of the muscles, bones and nerves, and in the chemical adenosine triphosphate which is the major source of energy for the cells of the body.
Phosphorus is mainly concentrated in the bones, while phosphorus is also required to make the protein molecules that repair the body tissues as well as for growth
Phosphorus is also important for nerve signaling and normal heartbeat, contraction of the muscles and functioning of the kidney.
The non-metallic element should be an important constituent of nervous and muscular tissue should be Phosphorus
What is Phosphorus?It should be found in the tissues with respect to the muscles, bones, and nerves. Also, the major source of energy for the body cell should be triphosphate.
The phosphorous should be concentrated in the bones also it is needed for making out the protein molecules so the tissues of the body should be repaired for the growth purpose also.
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HELP ASAP THIIS IS DUE IN 1 hour Helpp
How many neutrons, electrons, and protons are in carbon?
Answer:
six protons, six neutrons, and six electrons
Explanation:
Explanation:
Six protons (because its proton number, at the bottom, is 6)
Six electrons (because the number of protons and electrons in an atom is the same)
The symbol also tells us that the total number of protons and neutrons in a carbon atom is 12. Note that you can work out the number of neutrons from the mass number and atomic number. In this example, it is 12 - 6 = 6 neutrons.
Hope I was helpful!
How many grams are in 1.5 moles of C5H12
Answer:
72.14878 grams
Explanation:
SnO2 + C → Sn + СО balance
Answer:
Tin(IV) Oxide + Carbon = Tin + Carbon Monoxide
Explanation:
why does an aluminum horseshoe bend but not break when a blacksmith pounds it into shape with a hammer?
Answer:
it's because aluminium is a ductile material
Place these unknown pH test papers in order from most acidic to most alkaline.
Four pH indicator strips.
Answer:
In order of the colors of the pH test papers from most acidic solutions to most alkaline solutions, the colors of the pH test papers would be
Red > Orange/Pink > Purple > Blue
(Red) Most acidic (Blue)Most alkaline
Explanation:
We can use the different colors of pH test papers to determine the acidity or alkalinity of a solution.
Definitions
A pH test paper is a strip of indicator paper which changes colour when placed in acidic or alkaline solutions.
A solution is said to be acidic if it turns the colour of the pH test paper RED
A solution is said to be alkaline/basic if it turns the colour of the pH test paper BLUE
Color changes
If the pH test paper turns red, then the solution is a very strongly acidic solution with pH less than 3 ( ie pH between 1-3)
If the pH test paper turns orange or pink, then the solution is a weak acidic solution with pH greater than 3 ut less than 7
If the pH test paper turns purple, then the solution is a weak alkaline solution with pH greater between 8-11
If the pH test paper turns blue, then the solution is a very strong alkaline solution with pH between 11 - 14
Summary
Therefore, in order of color changes from the most acidic solutions to most alkaline solutions, the colors of the pH test papers would be
Red > Orange/Pink > Purple > Blue
Most acidic Most alkaline
Answer:
d<c<a<b
Explanation:
Pls answer this question for points 15 and mark brainless pls easy I don’t know pls
Answer:
nitrate
Explanation:
nitric acid produces nitrate salt
ANSWER THIS QUESTION AND GET 10 POINTS AND BRAINLEST
Answer:
Its highly basic
Plz help
When the equation Al + Br2 - AlBr3 is balanced, the coefficient for Al is
a 1
b 2
c 3
d 4
Answer:
c
Explanation:
The coefficient of Al in the balanced chemical equation has been 2. Thus, option B is correct.
The balanced chemical equation has been termed as the equation where the atoms of each element have been the same on the product and the reactant side.
The given chemical equation has consisted of 2 atoms of Br on the reactant side and 3 atoms of Br on the product side.
The atoms have been balanced with the addition of coefficient 3 on the reactant side, and 2 on the product side. This will give the 6 atoms of Br on both the products and the reactant's side.
[tex]\rm Al\;+\;3\;Br_2\;\rightarrow\;2\;AlBr_3[/tex]
The atoms of Al have become imbalanced. The Al atoms can be balanced by the addition of 2 as a coefficient on the reactant side. This will provide 2 atoms of Al on both the product and the reactant side.
[tex]\rm 2\;Al\;+\;3\;Br_2\;\rightarrow\;2\;AlBr_3[/tex]
The coefficient of Al in the balanced chemical equation has been 2. Thus, option B is correct.
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Help would be much appreciated! i'll mark brainliest
Answer:
group 2
Explanation:
ANSWER THESE 5 MULTPLE CHOICE QUESTIONS!!!
I'LL GIVE 30 POINTS AND A BRAINIEST:)
Answer:
Q 1 oxygen 2 6
Q2 D
Q3 B
4 Mg
5 B
Explanation:
Question 4
Calculate the mass of 7.1 x 1024 formula units of magnesium hydroxide, Mg(OH),
Answer: 69 g answer: I looked it up and it said .org, please give me brainliest!
Mariyam, a marine biologist, measures the length of a great white shark at 4.5 m long and its teeth at an average of 50 mm long. She wants to convert both measurements to centimeters.
Answer:
450cm
50cm
Explanation:
10mm = 1 cm = 0.1 dm = 0.01 m
You always multiply by ten from right to left and divide by ten from the left to the right.
In some types of decay, elements undergo transmutation. Which two
statements correctly describe this process?
A. The number of nucleons is the same before and after.
B. The parent element is different from the daughter element.
C. The number of atoms is conserved, but the number of nucleons
is not.
D. The atomic masses of the parent and daughter elements are the
same.
The statements which describes elements undergoing transmutation are the number of nucleons is the same before and after and the parent element is different from the daughter element.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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select all that are true
A
The central atom of any valid Lewis electron-dot structure must have a minimum of eight valence
electrons.
B
G. N. Lewis based his electron-dot model for chemical bonding on the fact that all noble gases have
ns²npa valence configurations (except hydrogen, which is 1s2).
es?
С
For the most part, electron-dot structures show electrons in pairs, but there are exceptions.
rotons
D
One of the points in favor of acceptance of the quantum mechanical model is that it explains why
Lewis' electron dot model works so well.
E
Lewis showed valence electrons as being paired up because a maximum of two electrons can
occupy a given valence orbital.
F
Lewis used the "duet rule" and the "octet rule" in drawing his electron-dot structures. This
corresponds to the fact that in each period, the representative elements are in rows of two or eight
elements.
Multiple lines between two atoms in a covalent lewis dot diagram mean:
A That there are more atoms involved
B That multiple electrons are shared between the atoms
C That the atoms are not bonded
D That the bond is easier to break
PLEASE HELP ME ASAP
Why is prerequisite knowledge important to high school students?
It helps you remember what you learned before.
It makes basic knowledge easier to learn.
It prepares you to learn at increasingly complex levels.
It helps you identify the behaviors new assignments require.
Answer:
Answer B
It makes basic knowledge easier to learn.
Explanation:
Assessing students’ prior knowledge allows an instructor to focus and adapt their teaching plan. For students, it helps them to construct connections between old and new knowledge.
In a series of controlled experiments, a student measures the force acting on a go-cart and the go-cart's acceleration. The student's data are shown below.
Based on the recorded observations, what is the mass of the go-cart in kilograms?
The mass of the go-cart in kilograms : 20 kg
Further explanationNewton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object
[tex]\large {\boxed {\bold {a = \frac {\sum F} {m}}}[/tex]
F = force, N
m = mass = kg
a = acceleration due to gravity, m / s²
Maybe the student's data are shown in the attachment
So, the mass of the go-cart :
[tex]\tt m=\dfrac{10}{0.5}=\dfrac{20}{1}=\dfrac{30}{1.5}=\dfrac{40}{2}=20~kg[/tex]
Which condition can cause excessive pressure on the high side of a self contained active recovery device
Answer:
What can cause excessive pressure on the high side of an active self-contained recovery device? A closed recovery tank inlet valve or excessive air or other non condensables in the recovery tank (either A or B) Portable refillable tanks or containers used to ship recovered refrigerants must meet what standard(s)?
Explanation:
please mark me as brainliest thank you
Immunotherapy attacks cancer cells by boosting:
a. The rate of cell division
b. The number of benign tumors
c. The frequency of body scans
d. The body's own defenses
Answer:
I think its the
d. The body's own defenses
WHAT WILL HAPPEN TO THE RESISTANCE OF CONDUCTOR IF :
1. the length of the wire is halved?
2. the area of cross-section of the conductor is increased?
3. the temperature of the conductor is increased?
Answer:
1. The length of the wire is halved.
the resistance of a conductor is directly proportional to it's length (L) as R - L. Thus doubling it's length will double it's resistance, while halving it's length would halve the resistance. Also the resistance of a conductor is inversely proportional to it's cross sectional area.
2. The area of cross-section of the conductor in increased.
On increasing the area of cross-section, resistance decreases. Thus is because resistance is inversely proportional to area.
3. The temperature of the conductor is increased.
With increasing temperature, the resistance of the wire increases as collisions within the wire increases and "slow" the flow of current... Since conductors typically display an increased resistivity with temperature increase, they have a positive temperature coefficient.
Select the correct answer from each drop-down menu.
A _ Is scientific knowledge established through direct observation and remalns constant. Sclentific knowledge can change
when scientists _
Answer:
A (Hypothesis) is scientific knowledge published through direct observation and remains constant scientific knowledge can change when scientists (generate hypothesis)
1. If Susan reproduced asexually what would be the outcome if she had offspring? What would they look like?
Answer:
They would look exactly like her, when you produce asexually your offspring is a clone of you. The offspring is genetically identical to the parent.
Explanation:
Consider the chemical equation.
2H2 + O2 Right arrow. 2H2O
What is the percent yield of H2O if 87.0 g of H2O is produced by combining 95.0 g of O2 and 11.0 g of H2?
Use Percent yield equals StartFraction actual yield over theoretical yield EndFraction times 100..
Answer:
the answer is C- 88.5%
Explanation:
Answer:
88.5 % or C
Explanation:
edgeeeee hope it helped
This chart shows descriptions of the atoms for four different substances.
Which substance is a solid?
Object 1
Object 2
Object 3
Object 4
which eletric configuration represents an atom of lithium in an excited state?
Answer:
2-0-1, 1-1-1, 0-1-2, but they must all equal 3 electrons in total
Explanation:
The "dots" in a electron dot structure (Lewis Dot) represent the following:
Valence electrons, the electrons that are in a noble gas.
Valence electrons, all the electrons that surround the nucleus of an atom
The group numbers 1A thru 8A
Valence electrons, the outer most electrons used in bonding
Answer:
the statement is true.....
