Answer:
A chemical reaction happens when two substances combine into a new one through chemical synthesis or chemical decomposition for two or more.
Explanation:
why dont nobody love me ANSWER THAT
Answer:
god loves you i love u
everybody loves you
In a convection current, hot, less dense, floating particles are farther away from their heat source. Eventually, they will begin to lose heat. What will happen next?
A.) The particles will lose energy, come closer together, become more dense and sink.
B.) The particles will gain energy, spread apart, become less dense and keep floating.
C.) The particles will lose energy, will spread apart, become less dense and sink.
D.) The particles will gain energy, come closer together, become more dense and sink.
Answer: it’s A
Explanation:
Question 13 (1 point)
What is the number of neutrons for Silicon-31
14
31
15
29
Answer:
the number of neutrons for silicon is 14
Which describes the normal boiling point of a substance?
A. The temperature at which the vapor pressure of a substance is greater than the air pressure at sea level.
B. The temperature at which the vapor pressure of a substance is less than the air pressure at sea level.
O C. The temperature at which the vapor pressure of a substance equals the air pressure at sea level.
D. The temperature at which the vapor pressure of a substance equals the air temperature at sea level.
Answer:
I think it's D
Explanation:
I'm so sorry if that's wrong, hope it helps!
The temperature at which the vapor pressure of a substance equals the air temperature at sea level. Therefore, the correct option is option D.
What is boiling point?The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid transforms into a vapor is known as the boiling point of a material.
A liquid's boiling point changes based on the atmospheric pressure in the area. Lower pressure, or partial vacuum, results in a liquid's boiling point being lower than it would be under atmospheric pressure. The temperature at which the vapor pressure of a substance equals the air temperature at sea level.
Therefore, the correct option is option D.
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Which of the following is not a physical change?
A. glass breaking
B. iron rusting
C. ice melting
D. sugar dissolving
Answer:
b or d
Explanation:
how does a study of a lion’s retina would provide evidence for lions not seeing colour
Answer:
Lions have fewer cones so see less colour but have great night vision especially since their eyes also have a membrane that concentrates weak light back to the retina and their pupils are able to enlarge to an extent much bigger than ours.
Hope this helps you out!
:)
What is the melting point of human blood? (Not boiling point)
1535.1 degrees Celsius or 5000 degrees Fahrenheit
Is most of the bacteria on your body harmful?
Answer:
No it is not, most bacteria is very helpful, it helps the body function and fight off diseases when the body is sick. Sometimes the good bacteria can't fight off the bad bacteria and will cause you to have to buy antibiotics. The antibiotics give the body a huge advantage at fighting off the disease and the body goes back to normal.
Which of the following terms is a term that could refer to heterogeneous matter? a. element b. mixture c. compound d. solution
Answer : b. mixture
Further explanationElement and compound are included in pure substance where the composition is the same in each part
Elements are made up of 1 type of atom, while the compounds of 2 or more types of atoms , both can be represented in the form of chemical symbols
A mixture is a combination of substances. The properties of a substance in the mixture component are unchanged
The mixture can be a homogeneous mixture or a heterogeneous mixture
the homogeneous mixture if each part has the same composition the heterogeneous mixture if each part has a different compositionSolution including into Homogeneous mixture, while suspension into a heterogeneous mixture
So a term that could refer to heterogeneous matter : b. mixture
describe the electron arrangement of a chlorine atom
Answer:
1s22s22p63s23p5.
Explanation:
When we write the configuration we'll put all 17 electrons in orbitals around the nucleus of the Chlorine atom. In writing the electron configuration for Chlorine the first two electrons will go in the 1s orbital. ... Therefore the Chlorine electron configuration will be
Please help!
How does being made of many cells help large organisms maintain homeostasis?
Answer:
Explanation:
To maintain homeostasis, unicellular organisms grow, respond to the environment, transform energy, and reproduce. The cells of multicellular organisms become specialized for particular tasks and communicate with one another to maintain homeostasis. All body systems work together to maintain homeostasis.
Being made up of many cells helps large organisms maintain homeostasis as follows:
Cells act in a coordinated way in the organisms and they prevent changes in the environment from interfering with their functioning.
The existence of large complex organisms was only possible thanks to the evolution of an internal environment, whose physical and chemical conditions must be maintained at relatively constant levels, favorable for cells.
The cells were able to specialize in tasks that would help maintain specific aspects of the internal environment.
For example, some cells organized into tissues specialized in maintaining the balance of salt and water; others, in providing nutrients; while others, in maintaining appropriate levels of oxygen and carbon dioxide.
In addition, specialized tissues and organs form systems within the internal environment of the organisms.
For example, the digestive system that provides nutrients; while the cells related to the circulation, among other things, distribute oxygen and nutrients.
In this way, specialized cells and tissues must continuously correct the physical and chemical composition of the internal environment, so that it remains conducive to life.
The maintenance of relatively constant conditions in the internal environment is what is called homeostasis.
Therefore, we can conclude that being composed of many cells helps large organisms to conserve specific aspects of the internal environment to maintain its homeostasis.
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please do this i have 7 mirw min to submit
Answer:
1:C
2:D
3:E
4:A
5:B
Explanation:
Table salt is sodium chloride and has the chemical formula of NaCl. What is the ratio of sodium atoms to chlorine atoms? (8.5D)
Answer
А 2:1
B
1:1
С
1:2
D
3:1
Answer:
Explanation:Table salt is sodium chloride and has the chemical formula of NaCl. What is the ratio of sodium atoms to chlorine atoms? (8.5D)
Answer
А 2:1
B
1:1
С
1:2
D
3:1
a student measures the time it takes for two reactions to be completed. Reaction A is completedd in 12 seconds, and reaction B is completed in 2q seconds. What can you conclude about the rates of the reactions?
A. The rate of reaction A is lower
B. The rates of reation A and B are equal
C. The rate of reaction B is lower
A. The rate of reaction A is lower
Further explanationThe reaction rate (v) shows the change in the concentration (reduction of reactants and product additions ) per unit time
Can be formulated:
Reaction: aA ⇒ bB
[tex]\large{\boxed{\boxed{\bold{v~=~-\frac{\Delta A}{\Delta t}}}}[/tex]
or
[tex]\large{\boxed{\boxed{\bold{v~=~+\frac{\Delta B}{\Delta t}}}}[/tex]
A = reactants
B = product
v = reaction rate
t = reaction time
Time of reaction A : 12 s
Time of reaction B : 2 s
Because reaction speed/the rate of reaction is inversely proportional to the time, then A. The rate of reaction A is lower
Is the chemical equation NH3(g)+O2(g)→NO(g)+H2O(l) balanced?
Answer:
yes
Explanation:
Which of the following structures demonstrates resonance? - HS Chem
Please finish this
C3H8+5O2
Answer:
Below.
Explanation:
This is the combustion of the hydrocarbon propane.
C3H8 + 5O2 --> 3CO2 + 4H2O
Answer:
C₃H₈ + 5O₂ = 3CO₂ + 4H₂O
Explanation:
This is called a complete combustion reaction because CO₂ and H₂O are produced. To balance any equation, you have to make sure there is the same number of each element on both sides.
From the Data Tables Shown at the top of this section (Table 1-4). Which of the sets of data describes an object that is at rest.
Table 1
Table 2
Table 3
Table 4
Answer:
I’d say Table 4, because it stays as the same.
Explanation:
What properties do you need to know to find the density of an object?
Answer: you need to know the Mass (grams) of the object, and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get an object's Density. How can you tell if something will float in water?
Explanation:
Answer:
To find the density of an object you need to know the Mass (grams) of the object and its Volume. Divide the Mass by the Volume in order to get the object's density.
Good luck! Hope this helped :)
Why is it hot in summer and in the winter why is cold
Answer: The sun is closer to the Earth is the summer and farther in the winter causing it to be hotter than it is colder in the summer and vise versa for the other question.
Explanation: I learned it ;)
Explanation:
The earth is tipped on its axis, 23.5 degrees in respect to the sun. In the summer time, the northern hemisphere has slightly more hours of daylight because of this, becoming more extreme as one goes north. If you go far enough north, there is 24 hours of sunlight in high summer.
So the average temperature is higher, because there is sunlight is present for more hours and the earth is warmed on balance.
At the same time, the south pole is in shadow, so the southern hemisphere has winter in June.
Six months later, the 23.5 degree tilt has the north pole facing away from the sun, and with fewer daylight hours, the temperature cools progressively. Meanwhile, the southern hemisphere is having it’s summer in December.
he model below shows a calcium atom.
An image has a mix of red and blue balls in its center and 4 concentric black rings around the center. The first ring from the center has 2 small green balls on it. The second ring has 8 small green balls on it. The third ring has 8 small green balls on it. The outermost ring has 2 small green balls on it.
How many electrons are in the third energy level?
2
8
18
20
Answer:
8
Explanation:
How do particles move without energy from areas of higher concentration to areas of lower concentration?
A. by transportation
B. by osmosis only
C. by passive transport
D. by active transport
Answer:B
Explanation:
this sentence is wrong, correct it
a change in state involves a change in mass
Answer:
the answer is
Explanation:
A change in state involves a change in volume.
WORTH 25 POINTS
PLS..!!!!!
Primary consumers _____.
a. receive energy directly from the sun
b. make their own food using photosynthesis
c. break down dead matter into chemical nutrients
d. are the first to receive energy from a plant
Answer: D. Are the first to receive energy from a plant.
Explanation: Paying attention to the trophic level in which the food chain occurs is key. Producers are the ones that receive energy directly from the sun. They also make their own food using photosynthesis. A decomposer is the one who breaks down dead matter into chemical nutrients. Therefore, Primary consumers are the first to receive energy from a plant.
I hope this helped!
Good luck <3
Scientists may design an experiment with a control group, which is a set of organisms or sam-ples that do NOT receive the treatment (the independent variable) that is being tested. Scientists can then compare normal changes in organisms or samples with those that might have occurred because of the treatment. The idea of a "control group" is not the same as a "controlled variable." Suppose a scientist is doing an experiment to determine the effect of a cancer drug on mice with lymphoma
Answer:
See explanation
Explanation:
I believe that the aim of the scientist is to determine the effect of a cancer drug on mice with lymphoma. In this experiment, the mice with lymphoma are exposed to the drug. This is the treatment in the experiment. A control group of mice having lymphoma is not exposed to this treatment, this is the control group. This control group establishes a baseline for the study.
By comparing the outcome of the experimental and control groups, the effect of a cancer drug on mice with lymphoma can be determined.
If you are given 30.7g of sodium chloride and 12.6g of chlorine, how many grams of sodium do you have?
Can someone please help me on numbers 6 and 7 please? Thank you!!!! :)
Answer:
6.b 7.c
Explanation:
i took the test in 6th grade
Which behavior is both territorial and used for courtship? (1 point)
Answer:
Display behavior or engaging in physical combats with other males
Explanation:
The behavior that both territorial and used for courtship is engaging in physical combats with other males because the male display and engage in physical combats with other males in order to attracts females as their mating partner or for courtship and also the male do this so as to secure their territories from Intruders and others taking over their own found territories. This normally occur in male lizards. The male like lizards have variants color on their skin, they display to attracts females and also to secure their territory.
Someone help explains these question pls x
1. Isotopes: the same element, the same atomic number, but different mass numbers
Atomic mass: the average atomic mass of all its isotopes
The mass of an atom of carbon-12= 12 amu ( atomic mass unit) because it has a stable nucleus
[tex]\tt RAM~X=\dfrac{the~average~mass~of~1~atom~X}{\dfrac{1}{12}\times mass~of~atom~C-12 }[/tex]
So RAM relative to isotopes Carbon-12 (C)
2. Ionic Formula is formed from cation(positive charge) and anion(negative charge)
Cation : Na⁺ ( positively charged 1)
Anion : SO₄²⁻ (negatively charged 2)
The anion cation's charge is crossed , then the compound :
[tex]\tt \boxed{\bold{Na_2SO_4}}[/tex]
3. pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
[H⁺] = 0.00001 M = 10⁻⁵ M
[tex]\tt pH= -log 10^{-5}\\\\pH=5~log~10\\\\pH=\boxed{\bold{5}}[/tex]
Was Aristotle atomic theory correct ?
Answer:
No, it is not.
Explanation: