Answer:
Open cluster
Explanation:
Why should I explain?
Answer: D open cluster
Explanation:
Which of the following Do plants gain form sunlight
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3 examples of density synonyms
frequency.
quantity.
thickness.
body.
closeness.
concretion.
heaviness.
solidity.
1. How many moles of potassium are present in 4.23 x 1025 potassium atoms?
(show solution)
please help if u know only. ty
Answer:
70.26 moles
Explanation:
1 mole of potassium will contain 6.02 x 10²³ atoms of potassium
6.02 x 10²³ atoms of potassium = 1 mole
4.23 x 10²⁵ atoms of potassium = 4.23 x 10²⁵ / 6.02 x 10²³
= 70.26 moles .
In an experiment temperature and the amount of NaCI dissolved in water were studied researchers changed the temperature of the water to see if it effects in the amount of NaCI being dissolved They conducted two tests one changing the temperature and another without changing the temperature the temperature change affected the amount of NaCI dissolved in water in this experiment the dependent variable is
Answer:
Dependent variable: Amount of NaCI dissolved in water
Explanation:
In an experiment, the DEPENDENT VARIABLE is the variable that the experimenter measures. It is the variable whose response is dependent on the independent variable.
In this experiment, researchers were studying the temperature and the amount of NaCI dissolved in water i.e. how a change in temperature affected the amount of NaCl dissolved. They conducted two tests one changing the temperature (experimental group) and another without changing the temperature (control group) the temperature change. It is clear that the RESPONDING/DEPENDENT VARIABLE IN THIS EXPERIMENT IS THE AMOUNT OF NACL DISSOLVED.
What would happen to the moons orbit if the earth disappeared
the importance of reproduction??
Answer:
The main significance of reproduction is to maintain continuity of species. It also helps in studying evolution as sexual reproduction results in variation among the species.Answer only if you
had/have braces how long did it take to notice change with your braces on
Answer:
about 2 years I think, you might have to ask your dentist
Explanation:
Answer:
it really depens of ur treatment i had braces and it took a year and now i got them again and they say its gonna take a year so it depends on ur treatment
Explanation:
What is the relationship between the kinetic energy of molecules in a solid and a liquid? Justify your response in two or more complete sentences.
will give brainliest
Answer:
Gases have more kinetic energy than liquids
Explanation:
Gases have more kinetic energy than liquids. Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces.
hope this helps
what ionic are compounds used in our daily life?
Answer:
Explanation:
NaCl sodium Chloride as ordinary salt
Naf sodium fluoride is used in toothpaste which we use every day
The correct name for Mgl, is -
F magnesium iodide
G magnesium iodite
H magnesium (II) iodide
J magnesium diiodide
Which has the greater N-O bond length, NO 2 -1 or NO 3 -1 ?
Answer:
NO 2-1
Explanation:
1/4 checkpoint
Time of Trial #1 (s)
2. 15
Time of Trial #2 (s)
Time of Trial #3 (s)
Average time (s)
2.05
2.02
2.07
Use the table to answer the questions.
What is the fastest time trial for the first quarter checkpoint?
seconds
What is the slowest time trial for the first quarter checkpoint?
seconds
What is the range of times measured for this checkpoint?
Answer:
here's the answers
Explanation:
Answer:
1. 2.02
2. 2.15
3. 0.13
Explanation:
doing it now of EDG :)
What do scientists use gamma rays for?
Answer: To determine the elements on other planets. The Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) Gamma-Ray Spectrometer (GRS) can measure gamma rays emitted by the nuclei of atoms on planet Mercury's surface that are struck by cosmic rays.
Explanation:
Calculate the density of an aluminum block with a volume of 100 cm3 and a mass of 270g.
Answer:
2.7 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{270}{100} = \frac{27}{10} \\ [/tex]
We have the final answer as
2.7 g/cm³Hope this helps you
Can scientists determine a more precise age of this snail fossil?
Answer:
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.
Explanation:
Answer:
mark the other person brainliest
Explanation:
Scientists now know that most elements come in more than one version. The different versions are called ____________. The difference between them is the number of neutrons in the nucleus.
Answer:
Isotopes
Explanation:
Scientists now know that most elements come in more than one version. The different versions are called Isotopes. The difference between them is the number of neutrons in the nucleus.
Isotopes usually differ in the mass number of the elements which is the reason why they also have a different neutron number. They may also differ in physical characteristics but would most likely have common chemical properties.
Calculate the energy needed to raise the temperature of 165.0 g of water from 10.0°C to 40.0°C. The specific heat capacity for water is 4.2J/g °C.
Answer:
20790 J
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 165 g.
Initial temperature (T1) 10 °C.
Final temperature (T2) = 40 °C.
Specific heat capacity (C) = 4.2 J/g °C.
Heat (Q) required =?
Next, we shall determine the change in temperature of water. This can be obtained as illustrated below:
Initial temperature (T1) 10 °C.
Final temperature (T2) = 40 °C.
Change in temperature (ΔT) =?
ΔT = T2 – T1
ΔT = 40 – 10
ΔT = 30 °C
Finally, we shall determine the heat energy required to raise the temperature of the water as follow:
Mass (M) = 165 g.
Specific heat capacity (C) = 4.2 J/g °C.
Change in temperature (ΔT) = 30 °C
Heat (Q) required =?
Q = MCΔT
Q = 165 × 4.2 × 30
Q = 20790 J
Thus, the heat energy required to raise the temperature of the water is 20790 J
how many moles of oxygen in 36.55 grams of CO2
Answer:
1.66 moles of oxygen
Explanation:
Given data:
Mass of CO₂ = 36.55 g
Number of moles of O = ?
Solution:
Number of moles of CO₂ = mass/molar mass
Molar mass of CO₂ is 44 g/mol
Number of moles = 36.55 g/ 44 g/mol
Number of moles = 0.83 mol
1 mole of CO₂ contain 2 moles of oxygen.
0.83 × 2 = 1.66 moles of oxygen
Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction
Answer:
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.
Explanation:
The mass of the reactants and products are equal and are not dependent on the physical state of the substances.
Law of conservation of mass and and law of conservation of energy describes this reaction very well.
What is law of conservation of mass?Law of conservation of mass states that that mass is neither created nor destroyed and remains constant over time.What is law of conservation of energy?Law of conservation of energy states that that energy is neither created nor destroyed , it only changes from one form to another form.How it is related with photo synthesis?In photosynthesis reaction plants uses sunlight as energy to convert carbon dioxide and water into glucose and oxygen.In this reaction total number of carbons , hydrogens and oxygens used remains constant.Thus, Law of conservation of mass and and law of conservation of energy describes this reaction very well.
Learn more about photosynthesis here
https://brainly.com/question/26568636
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A topographic map with 4 regions labeled. Region 1 is an area with no contour lines near the railroad. Region 2 is an area with few contour lines. Region 3 is an area with several contour lines close together with index contour line labeled 450. Region 4 is an area with few contour lines.
Which area is the flattest?
1
2
3
4
Answer:
Region one because an area that has contour lines close together means that the area is steep. but in region ones case it has no contour lines meaning the area is flat.
Answer:
A. 1
Explanation:
!!please help asap ty only if you can ty!!!
2. How many atoms of zinc are present in 0.48 mol of zinc?
(show solution)
Answer:
2.89 × 10²³ atoms of zincExplanation:
The number of atoms of zinc can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.48 × 6.02 × 10²³
We have the final answer as
2.89 × 10²³ atoms of zincHope this helps you
Answer:
2.89× 10²³ atom
Explanation:
Given data:
Number of atoms of Zn = ?
Number of moles of Zn = 0.48 mol
Solution:
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.
For example,
1 mole = 6.022 × 10²³ atom
0.48 mol × 6.022 × 10²³ atom / 1mol
2.89× 10²³ atom
Help me with this....
Answer:
1,3,4
Explanation:
Because you have to know what each one is
What is the mass of 35.0L of oxygen?
Answer:15.9994 g/mol
Explanation:
How I do this? and I need help like now!
Answer:
1ohm
Explanation:
Hydrochloric acid and sodium hydroxide can be combined to form sodium chloride and water. Which best explains the reaction?
Answer:
The mass of sodium hydroxide will result in the same mass of sodium chloride.
The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water
The mass of hydrochloric acid will result in the same mass of sodium chloride.
The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water
Explanation:
Answer:
The mass of sodium hydroxide will result in the same mass of sodium chloride.
The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water
The mass of hydrochloric acid will result in the same mass of sodium chloride.
The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water
Explanation:
What functions are performed by the Brainstem?
Answer:
baning and stuff XD
Explanation:
Answer: regulation of breathing
Ability to sense pain
Regulation of circulatory system
Explanation:
Rosa is breathing normally and eats a peanut butter sandwich for lunch. Peanut butter contains a lot of protein, and bread is mostly starch. Rosa plans to go for a run later this afternoon.
What does she need from the food she ate and the air she breathes so that she can go on her run? How do Rosa’s body systems work together to get the molecules she needs into her cells? How do her cells use these molecules to make energy for her body to run?
Answer:
She mainly needs the Peanut Butter because it has a lot of protein and her cells worked together to help her run.
Answer:
mostly PB for proteins
Explanation:
PLEASE HELP!!!
A piece of wood has a mass of 2.85 g; when placed in 20.0 mL of water, the water volume increased to 23.4 mL. What is the density of this piece of wood?
_______ Answer _______Units
Answer:
d = 0.84 g/cm³
Explanation:
Given data:
Mass of wood = 2.85 g
Volume of water = 20.0 mL
Volume of water + wood = 23.4 mL
Density of wood = ?
Solution:
Volume of wood = (Volume of water + wood ) - Volume of water
Volume of wood = 23.4 mL - 20.0 mL
Volume of wood = 3.4 mL
1 mL = 1 cm³
Density of wood:
d = m/v
d = 2.85 g / 3.4cm³
d = 0.84 g/cm³
Who has a higher frequency X-ray or, radio waves?
Answer:
radio waves
Explanation:
How many joules of energy are required to vaporize 512.0 g of water?
Answer:
The heat required to evaporate 512 g of water initially at 0°C is 1,371,340.8 J
Explanation:
The given parameters are;
The mass of water given in the question = 512.0 g
The specific heat capacity of water = 4.184 J/(g·°C)
The heat of vaporization of water = 2,260 J/g
The heat, Q, required to raise the temperature of 512.0 g from 0°C to 100°C is given as follows;
Q = 512 × 100 × 4.184 = 214,220.8 J
The heat required to vaporize 512.0 g of water at 100°C = Mass × Heat of Vaporization
The heat required to vaporize 512.0 g of water at 100°C = 512 × 2260 = 1,157,120 Joules = 1,157.12 kJ
The heat required to evaporate 512 g of water initially at 0°C is therefore;
214,220.8 J + 1,157,120 J = 1,371,340.8 J.