Answer:
A hotter star should be brighter than a cooler star. ... Although they are cool [red], they are very luminous, and therefore bright. In the Main Sequence, stars that are cool are not as luminous. Because the energy is spread across a larger area, surface temperatures are actually cooler, reaching only 2,200 to 3,200 degrees Celsius (4,000 to 5,800 degrees Fahrenheit), a little over half as hot as the sun
Explanation:
Match each atomic particle with the correct charge.
1. proton neutral
2. neutron positive
3. electron negative
The proton is a postitive charge, therefore, being 1 (proton) matched to positive. Whilst neutron (2) is matched to neutral. Thus electron (3) is matched to negative.
How many grams of potassium phosphate (K3PO4) will be formed if you react 20.16 grams of potassium hydroxide (KOH) with excess phosphoric acid?
3 KOH + H3PO4 → K3PO4 + 3 H2O
_ grams of K3PO4 (round to 3 sig figs)
a) 234
b) 25.4
c) 64.5
d) 58.7
25.4g of potassium phosphate (K3PO4) are formed.
What is potassium phosphate?Potassium phosphate is an inorganic salts of potassium and phosphate.
How to convert mole to grams?Calculate the number of moles mentioned in the questionFind the molar mass of the substance.Multiply both the values.3 KOH + H3PO4 → K3PO4 + 3 H2O
Step 1: Convert from grams to moles using the molar mass.
Step 2: Use the molar ratio to determine moles of other substance.
Step 3: Convert from mole to grams using the molar mass.
Convert grams to moles using the molar mass
25.4g KOH (1 mol KOH/56.098g KOH)
= 0.3593mol KOH
Mass of H3PO4 produced
0.3593 mol KOH ( 1 mol H3PO4/3 mol KOH)
= 0.1197 mol H3PO4
converting mole to grams
0.1197 mol H3PO4 (98g H3PO4/1 mol H3PO4)
= 11.730g H3PO4
Mass of K3PO4 produced
0.3593 mol KOH (1 mol K3PO4/3 mol KOH)
= 0.1197 mol K3PO4
converting mole to grams
0.1197 mol K3PO4 (212.267g K3PO4/1 MOL K3PO4)
= 25.408g K3PO4
Hence, option b is the correct answer.
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a compound consists of 81.8% C and 18.2% H by mass. What is its empirical formula?
Answer:
Empirical formula of 81.8 carbon and 18.2 hydrogen
Steps
Find the empirical formula of a compound that has 81.8% of Carbon (C), 18.2% of Hydrogen (H).Divide by fractional component of each mole value: C=1.5354936431103, H=4.0709872862205Round to closest whole numbers: C=2, H=4 Combine to get the empirical formula: C2H4PLEASE HELP I'M BEING TIMED!! Which type of star system has the most stars?
A. Open Cluster
B. globular cluster
C. Eclipsing binary
D. binary star system
Answer:
Hi! It's B - globular cluster
Answer:
B Globular Cluster
Explanation:
Sorry if I am wrong :)
I neeeed helpppppppppppp!!!!!!
Answer:
it is D
Explanation
Electrons are a type of subatomic particle with a negative charge. ... Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron).
a sample of an unknown metal has a mass of 21.6g and volume of an 8.00cm3 calculate the density of the unknown metal
Answer:
2.70 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{21.6}{8} \\ = 2.7[/tex]
We have the final answer as
2.70 g/cm³Hope this helps you
What is the [H+] if the pH of a
solution is 1.65?
Answer:
So the concentration of hydrogen in solution of 1.65 pH is 2.2 × 10⁻²
Why do mammals require lungs? Provide 3 reasons.
An object has a density of 40 g/cm3 and a mass of 240 g what is it’s volume
Answer:
6cm^3
Explanation:
240/40=6
6 cm^3
Balance the equation C4H8 (g) + ?O2(g) → ? CO2 (g) + ? H2O (g), using the smallest possible integers. What is the coefficient of CO2?
What are groups of particles held tightly together called?
What is a cation and where can you find it on the periodic table?
What is an anion and where can you find it on the periodic table?
Answer:
A cation is an ion with fewer electrons than protons. Therefore, it has a positive charge. The electric charge on a proton is equal in amount to the charge on an electron. Anions are atoms or radicals (groups of atoms), that have gained electrons. Since they now have more electrons than protons, anions have a negative charge. Halogens always form anions, alkali metals and alkaline earth metals always form cations. Most other metals form cations (e.g. iron, silver, nickel), whilst most other nonmetals typically form anions (e.g. oxygen, carbon, sulfur).
Explanation:
An anion and cation cannot be specifically found on the periodic table.
The chemical elements are shown in tabular form on the periodic table, sometimes referred to as the periodic table of the elements. It is frequently used in physics, chemistry, and other sciences and is frequently regarded as a symbol of chemistry.
What is an anion?An ion with fewer electrons than protons is known as a cation. It is hence positively charged. Protons and electrons both have the same amount of electric charge. Atoms or radicals (groups of atoms) that have gained electrons are known as anions. Anions now have a negative charge because they have more electrons than protons.
Alkali metals and alkaline earth metals always produce cations, while halogens always produce anions. Iron, silver, and nickel are among the most common non-metals that create cations, whereas the majority of other metals do the same (e.g. oxygen, carbon, sulphur).
The periodic table does not clearly list an anion or cation.
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14 steps decay series
when 45mL of 0.25mol/L sulfuric acid is mixed w/ 25mL of 0.58mol/L Calcium hydroxide, the solution has a?
1. What is the basic unit of structure and function in a living thing
called?
2. How did the invention of the microscope help scientists learn
more about living things?
3. Who was the first to discover cells?
4. Draw a timeline that shows the dates, discoveries, and
scientists involved in the development of the cell theory.
5. What are the four statements of the cell theory?
6. What are specialized cells? List three examples.
7. What are four similarities that all cells share?
8. List the cell part for each letter on the diagram below. What is
the function of each part?
Which HTML tag is used to create a heading on a web page? (5 points)
HTML headings are defined with the <h1> to <h6> tags. <h1> defines the most important heading.
hope this helps ^^
Why do we round numbers?
Answer:
We round numbers so we can find an answer or an estimate that will be close to the actual answer. Rounding numbers is also another way to get close to an exact answer without the trouble of having to calculate every number.
Answer:
Rounding numbers make the numbers easier and more simple to use . Though they may less accurate because of the changes number . Rounding is mainly used for estimates
Iron-containing minerals in rocks may combine with water and air to create rust. This is an example of
A. chemical weathering
B. mechanical weathering
C. abrasion
D. exfoliation
Answer:
A
Explanation:
chemical reaction are those type of reaction that are irreversible and a new substance is being formed therefore when the iron combine with water and air it leads to rusting.
This data was collected after conducting an experiment about the amount, in liters, of water a specific plant needs per month. An accepted value for the measurement is 6 liters. These are the collected experimental values.
Which values in the collected data are precise? Check all that apply.
ANSWER:
all of them
Explanation:
preciseness is measured by how many decimal places are used not by accuracy. since all of these are to the same decimal place they are all equally precise even if they are inaccurate.
What is the balanced equation for the manufacture of ethanol from glucose
Answer:
C6H12O6 → 2C2H5OH + 2CO2
Explanation:
Glucose is an organic molecule, specifically a sugar, with the formula C612O6 while ethanol is another organic molecule with formula; C2H5OH.
However, as rightly said in this question, ethanol can be got from glucose via a process called fermentation in the presence of a catalyst called YEAST. The balanced equation is as follows:
C6H12O6 → 2C2H5OH + 2CO2
An example of a high explosive is what?
Answer:
High explosives do not need to be contained to make their bang. Nitroglycerine, trinitrotoluene, and RDX are high explosives.
Explanation:
Question
WHMIS legislation states that Material Safety Data Sheets:
A)are expired if they are more than 3 years old
B) must be available for workers to review
C)are expired if they are more than 5 years old
D )both a and be
E) both b and c
Answer: B) must be available for workers to review
Explanation:
WHMIS is a Canadian program which gives information to the employers about the workers knowledge about hazardous materials that are used in the workplace. It is ensured that the worker labelled the hazardous material at the workplace, material safety data sheet should be created to supplement the label, and worker's education program for learning the safety precautions is also conducted.
The material safety data sheets are created by the employers and their is no expiry date for such data for workers instead they receive a next recommended training date for participating in the training and avail another certification after the completion of first year.
Questions
1. How would you describe life and why?
Solve and use correct sig figs AND units: (Example of how to type: 3.26 m2)
The density of mercury is 13.6 g/mL. What is the mass of 3,426 mL of mercury?
Answer:
m = 46593.6 g
Explanation:
Given data:
Mass of mercury = ?
Volume of mercury = 3426 mL
Density of mercury = 13.6 g/mL
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
by putting values,
13.6 g/mL = m/ 3426 mL
m = 13.6 g/mL × 3426 mL
m = 46593.6 g
DUE VERY VERY VERY SOON
What are the rows of elements called on the periodic table?
Answer:
"The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups."
Explanation:
I GIVE OUT FREE POINTS
A. When glucose molecules link up what substance do they form?
B. Which nutrient is made from amino acids?
Answer:
Explanation: b
What if I’m not really living just surviving
What is the mass of 2409793.03 particles of N2?
What is a part's structure related to?
USE LETTERS FOR ANSWERS, NO NEED TO EXPLAIN
a) Substitute symbols and formulas for words.
b) Predict the products. If no reaction occurs, write “NR” after the --> sign. c) Include abbreviations for the physical state.
d) Write out and balance the equation.
6. Mercury is poured into an aqueous solution of zinc nitrate.
7. Solutions of potassium iodide and lead (II) nitrate are mixed. The resulting lead compound is a precipitate.
thank you! :)
Answer:
Ok:
Explanation:
6a) [tex]Hg + Zn(NO_3)_2\\[/tex]
b) NR
c) [tex]Hg_{(l)} + Zn(NO_3)_2 {(aq)}=> NR[/tex]
d) Welp, no reaction so i don't know.
7a) [tex]KI + Pb(NO_3)_2[/tex]
b) [tex]PbI_2 + KNO_3[/tex]
c) All are aqeuous except for PbI2 which is solid
d) [tex]2KI _{(aq)}+ Pb(NO_3)_2_{(aq)} => PbI_2_{(s)} + 2KNO_3_{(aq)}[/tex]
Check if that is ok or if my work has any issues :).