Answer:
.00305
Explanation:
There a 7 significant figures in the number because we know that leading zeroes are NOT counted. To round the number to have only 3 significant figures, we will need to round to the 5th decimal place. Remember the basic rules of rounding; 5 and up, round up, 4 and below, round down.
.00305346 → .00305
Best of Luck!
13. Water is a polar compound because it exhibits _______
charges.
O A. negative
O B. positive
O C. opposite
D. neutral
Answer:
Opposite.
Water exhibits negative charge near hydrogen, positive near oxygen.
This is why it is OPPOSITE.
Let me know if this helps!
Water is a polar compound because it exhibits opposite charges. Therefore, option C is correct.
What is polar compound ?The term polar compound is defined as the compound with distinct regions of positive and negative charge, as a result of bonding with atoms such as nitrogen, oxygen, or sulfur.
Water is a polar compound because the covalent bonds between hydrogen and oxygen in the water molecule are polar in nature. Any molecule with lone pairs of electrons around the central atom is polar compound.
In water there are two atoms are present that are oxygen and hydrogen. Hydrogen has positive charge while oxygen has negative charge,
Thus, Water is a polar compound because it exhibits opposite charges, option C is correct.
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If I add sugar into water then _________________
Pls help
Explanation:
When adding sugar to water it became a syrupy solution. Here sugar acts as solute, the water acts as solvent and syrupy acts as solution. When adding sugar to water, the disaccharide of sucrose is converted into monosaccharides of glucose and fructose
Answer:
syrupy solution
Modern periodic table is based upon atomic number. Explain what does the modern periodic table states about the atomic numbers ?
Answer:
Explanation:Elements of the periodic table are arranged in order of increasing atomic number. The periodic law states “When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.”
prepare a dialogue between two friends about development of society .
Answer:
Pls pls pls mark brainliest
2. School bus accidents are very rare, possibly because they are so easy to see.
School buses have been around since 1915, but the official color of bright
yellow wasn't used until 1939. Would grey school buses get in more accidents?
Help plz!!!
Answer:
Grey school buses would likely get in more accidents because other drivers are expecting a yellow bus to make frequent stops and the lights and stop sign are noticeable on a brighter color.
Explanation:
yellow buses are easier to see in fog than a grey bus
what does porous mean
Answer:
porous = allowing liquid or air to pass through slowly
I hope it's helpful
Answer:
It is a rock or or other materials, having minutes interstices through which liquid or air may pass.
26. Calculate the mass of hydrogen formed when 25 grams of aluminum reacts with excess hydrochloride acid. 2AI + 6HCl →l Al2Cl6 + 3H2
Answer:
2.76 gram
Explanation:
2AI + 6HCl → 2AlCl3 + 3H2
get the mol of aluminum => n = m / M = 25 / 27 = 0.925 (mol)get the ratio mol of Hydro => nH2 = 0.925 * 3 / 2 = 1.38 (mol)get weight of hydro mH2 = n x M = 1.38 x 2 = 2.76 (gram)Answer
Al +2 HCl - AlCl2 + H2
Energy in the amount of 420 J is added to a 35 g sample of water at a temperature of 10°C. What is the final temperature of the water?
The final temperature of the water, T2 = 38.57°C
Temperature can be defined as a measure of the degree of hotness or coldness of a physical object (body). Thus, it is measured with a thermometer and its units are degree Celsius (°C), Fahrenheit (°F) and Kelvin (°K).
A calorie refers to the amount of heat required to raise the temperature of a gram of water by one (1) degree Celsius (1°C).
Given the following data:
Quantity of energy = 420JMass = 35 gramsInitial temperature, T1 = 10°CThe specific heat capacity of water is 4.2 J/g°C.
To find the final temperature of the water (T2):
Mathematically, the quantity of energy (heat capacity) is given by the formula;
[tex]Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.M represents the mass of an object.C represents the specific heat capacity of water.dt represents the change in temperature.Substituting the values into the formula, we have;
[tex]420 = 3.5 \; * \; 4.2 \; * \; dt[/tex]
[tex]420 = 14.7 \; * \; dt\\\\dt = \frac{420}{14.7}[/tex]
Change in temperature, dt = 28.57°C
Next, we would solve for the final temperature by using this formula;
[tex]dt = T2 - T1[/tex]
[tex]28.57 = T_{2} - 10\\\\T_{2} = 28.57 \; + \; 10\\\\T_{2} = 38.57[/tex]
Final temperature, T2 = 38.57°C
Therefore, the final temperature of the water, T2 is equal to 38.57°C
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The solubility of solids______ when the temperature is increased.
A. increases
B. decreases
C. does not change
Place These Bodies Of Our Solar System In Proper Order Of Formation
1.The Sun
2.Outer Planets
3.Planetesimals
4.Inner Planets
5. Solar Nebula
Water has __________ than other liquids such as ethanol , reflecting its capacity to absorb large amounts of heat. View Available Hint(s)for Part A lower specific heat a lower heat of vaporization a higher boiling point a lower capacity for forming hydrogen bonds less surface tension
Answer:
a high boiling point
Explanation:
Water has a high boiling point because it is held together by stronger molecular forces compared to ethanol
Which of the following is the best definition of a physical property?
A. Tearing paper in half.
B. Something that can be observed or measured while changing the identity of the substance.
C. The ability of something to undergo a change or reaction.
D. Something that can be observed or measured without changing the identity of the substance.
Answer:
D.Something that can be observed or measured without changing the identity of the substance.
Which is the electron configuration for lithium?
1s2
2s3
1s22s1
1s12s2
Answer:
1s2, 2s1
Explanation:
Lithium is the first element in the 2nd row of elements meaning its 1s orbital is completely filled and 1 electron is in the 2s orbital.
Answer:
the answer is C
Explanation:
Which of the following would increase the pressure of a gas in a container?
A. Decreasing the kinetic energy of the gas
B. Increasing the temperature of the gas
C. Decreasing the number of gas particles
D. Increasing the volume of the container
The only option that would increase the pressure of a gas in a container is B. Increasing the temperature of the gas. Option B
To understand which factor would increase the pressure of a gas in a container, we need to consider the relationship between pressure and various variables in the ideal gas law and the kinetic theory of gases.
The ideal gas law states that pressure (P) is directly proportional to the number of gas particles (n), the temperature (T), and inversely proportional to the volume (V) of the container. Mathematically, it can be expressed as:
PV = nRT
where R is the ideal gas constant.
Based on this equation, we can analyze the options given:
A. Decreasing the kinetic energy of the gas: According to the ideal gas law, temperature is directly proportional to pressure. Therefore, decreasing the kinetic energy (which is related to temperature) would decrease the pressure, not increase it.
B. Increasing the temperature of the gas: As mentioned above, temperature is directly proportional to pressure. Increasing the temperature of the gas would increase its kinetic energy, resulting in more frequent and energetic collisions with the container walls, thus increasing the pressure.
C. Decreasing the number of gas particles: According to the ideal gas law, the number of gas particles (n) is directly proportional to pressure. Therefore, decreasing the number of gas particles would decrease the pressure, not increase it.
D. Increasing the volume of the container: According to the ideal gas law, volume (V) is inversely proportional to pressure. Increasing the volume of the container would decrease the pressure, not increase it.
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Froming a hypothesis is the first step of the scientific methhod true or false
Answer:
The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false. Step 2. Form a hypothesis.
Answer:
False
Explanation:
The first step of the scientific method is to make an observation.
7. What measures are applicable in the context of Nepal to push energy crisis further. Describe any three points clearly.
Answer:
which energy?........
Explanation:
..........................
........
....
Drag each tile to the correct box.
Match the hydrocarbon names and structural formulas.
2-butene
2-methylbutane
2-butyne
H
1
HC-H
H H
H
1
H-CC c C-H
1 1
H
H H
H
H
C-H
H-C-CEC
1
H
H
21 Edmentum. All rights reserved.
this is my attachment answer hope it's helpful to you
Sugar is made up of clear, colorless crystals that dissolve easily in water, but the crystals and their solution do not conduct electricity. Which statement describes sugar? It is made up of atoms that are held together by metallic bonds. It is made up of atoms that are held together by covalent bonds. It is made up of atoms that are held together by weak ionic bonds. It is made up of atoms that are held together by strong ionic bonds.
Answer:
it is made up of atoms that are held together by covalent bond
The volume of a gas was 48 mL when the temperature was 159.6 ºC. If the temperature was initially 4.9 ºC, and there was no change in the pressure, what was the initial volume of the gas?
According to Charles law
[tex]\boxed{\sf \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}[/tex]
[tex]\\ \sf\longmapsto \dfrac{48}{159.6}=\dfrac{V_2}{4.9}[/tex]
[tex]\\ \sf\longmapsto V_2=\dfrac{48\times 4.9}{159.6}[/tex]
[tex]\\ \sf\longmapsto V_2=\dfrac{235.2}{159.6}[/tex]
[tex]\\ \sf\longmapsto V_2=1.4mL[/tex]
Water and development are substitute of one another?
explanation with it, please
Due to common purpose water and development are substitute of one another.
Water and development are substitute of one another because both contribute in the growth of economy of a country and increases life standard of its people. The presence of water causes growth and betterment of the economy that leads to development of the nation so we can say that due to same effect, both are used as a substitute i.e. in place of one another in the process of growth and betterment.
https://brainly.com/question/24333957
Answer: Freezing point depression
Explanation:
freezing point depression is a phenomenon that describes why adding a solute or solvent results in the lowering of the freezing point of the solvent
PLEASE HELP URGENT!!!! 20 POINTS!!!!!
Identify the most common graph types, and explain what each is used for.
Explanation:
Bar Graph.Segmented Bar Graph.Column Graph. Whiskers Graph (also called a Box Plot)Frequency Graph (Frequency Table)Cumulative Frequency Table.Frequency Polygon.Histogram.BAR GRAPH
The bar graph is used to compare the items between different groups over time, bar graphs are used to measure the changes over a period of time, when the changes are larger, a bar graph is the best option to represent the data.
SEGMENTED BAR GRAPH
A segmented bar graph is used to compare two categories within a data set, the whole bar represents all the data within one category. Then, each bar is separated into parts (segments) that show the percentage of each part in the second category.
COLUMN GRAPH
A column graph summarizes categorical data by presenting parallel vertical bars with a height (and hence area) proportionate to specific quantities of data for each category, this type of graph can be useful in comparing two or more distributions of nominal- or ordinal-level data.
WHISKERS GRAPH
A box and whisker plot is a way of summarizing
a set of data measured on an interval scale, it is often used in explanatory data analysis, this type of graph is used to show the shape of the distribution, its central value, and its variability.
FREQUENCY GRAPH
Frequency tables, pie charts, and bar charts can be used to display the distribution of a single categorical variable,these displays show all possible values of the variable along with either the frequency (count) or relative frequency (percentage).
CUMULATIVE FREQUENCY GRAPH
Cumulative frequency is used to determine the number of observations that lie above (or below) a particular value in a data set, the cumulative frequency is calculated by adding each frequency from a frequency distribution table to the sum of its predecessors.
FREQUENCY POLYGON
A frequency polygon is a graphical form of representation of data, it is used to depict the shape of the data and to depict trends, It is usually drawn with the help of a histogram but can be drawn without it as well. Frequency polygons are a graphical device for understanding the shapes of distributions.
HISTOGRAM
A histogram is used to summarize discrete or continuous data, in other words, it provides a visual interpretation of numerical data by showing the number of data points that fall within a specified range of values (called “bins”). It is similar to a vertical bar graph.
The electron configuration for Helium (He) is shown below.
1s2
Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?
Convert 15,000 seconds into minutes
Answer:
250 minutes
Explanation:
I hope you do well
Which of the following describes metallic character on the periodic table?
A. It increases as you move right to left within a period and down a group on the periodic table.
B. It increases as you move left to right within a period and down a group on the periodic table.
C. It increases as you move right to left within a period and up a group on the periodic table.
D. It increases as you move left to right within a period and up a group on the periodic table.
Mark for review (Will be highlighted on the review nane)
help
Answer:
Option A.
Explanation:
If you picture the Periodic Table in your head...
you'd see that the Metals are located at the left hand part of the periodic table and their Metallic Character Increases as you go down the group.
So if you travel from the right, towards the left...You'd come across your Metals.
In order words... Option A is your answer.
What types of mixtures are these?
Explanation:
Homogeneous Mixture:-
A cup of tea and sugarFood coloring dissolved in waterHeterogeneous Mixture:-
Peanuts and almonds mixed together in a bowlA bucket full of sand and gravel
[tex]\huge\mathfrak\red{QuEsTioN:-}[/tex]
How many neutrons are present in 4.4 gram of Co2
Explanation:
hope it will help you Mark me as a brilliant
[tex]\large{\textrm{{{\color{navy}{Answer....}}}}}[/tex]
\large{\textrm{{{\color{navy}{Answer....}}}}}
__________________________[tex]\Huge \mid \underline {\mathcal {{{\color{orange}{Answer...}}}}} \mid[/tex]
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__________________________[tex]\boxed{\sf Note:-}[/tex]
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____________________________[tex]\begin{gathered} {\underline{\boxed{ \sf {\red{Answer}}}}}\end{gathered}[/tex]
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___________________[tex]\huge\red{\boxed{\orange{\mathcal{\overbrace{\underbrace{\fcolorbox{red}{pink}{\underline{\red{❥Answer࿐}}}}}}}}}[/tex]
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_____________________________[tex]{\boxed{ \Huge{ \blue{ \mathcal{ \underline{ Answer}}}}}}[/tex]
{\boxed{ \Huge{ \blue{ \mathcal{ \underline{ Answer}}}}}}
_______________________[tex]\large\bf\purple{ \longrightarrow} \rm \:[/tex]
\large\bf\purple{ \longrightarrow} \rm \:
__________________[tex]\Huge\bf\overbrace{\underline{ \underbrace{\blue \dag \orange{Answer \blue \dag}}}}[/tex]
\Huge\bf\overbrace{\underline{ \underbrace{\blue \dag \orange{Answer}}}} \blue\dag
_____________________[tex]\Huge\bf\underline{\underline{\red{Answer}}}[/tex]
\Huge\bf\underline{\underline{\red{Answer}}}
____________________[tex]\Huge\bf { \underline{\mathbb {\green{ Answer }}}} [/tex]
\Huge\bf \underbrace{ \underline{\mathbb {\blue \dag\green{ Answer }}}} \underline\blue\dag
WILL MARK BRAINLIEST IF CORRECT
Answer:
3 - a heterogeneous mixture
4- Sweet tea is an homogeneous mixture
Answer:
Explanation:
6. d
7. b
8. c
Which type of monomer combines and forms nucleic acids?
A. Nucleotide
B. Nitrogenous base
C. Amino acid
D. Monosaccharide
Answer:
A. Nucleotide
Explanation:
Nucleotides are the monomers that make up nucleic acids, such as DNA and RNA.
1. what is hard water.
2. Mention four sources of water.
3. write down the chemical formula of water.
4. What is purification of water.
5. Mention two importance of purification of water.
6. Mention 4 method used ot purify water. 7. Mention 4 impurities found in water.
8. Explain the term contaminated of water.
9. State two physical properties of water. 10. mention the names of of the elements that causes hardness in water.
Answer:
Oh man, the questions are much
Explanation:
1. Hard water is water what has high mineral content. (I can't go into details )
2. River, reservoir, Lake, groundwater, rain
3. H2O
4. POW is the process of removing undesirable chemicals, biological contaminants, suspended solids and gases from water.
5. Reduces amount of chlorine, soil residue, and organic and inorganic substances. Helps in improving the taste. Smell and visual appearance of water.
6. Boiling, filtration, distillation, and chlorination
7. Dust, dirt, harmful chemicals, biological contaminants, radiological contaminants
8. It is the contamination of water bodies, usually as a result of human activities, in such a manner that negatively affects it legitimate uses.
9. Colorless, turbidity, taste And odor.
10. Hardness of water is caused by compounds of calcium and magnesium, and by a variety of other metals.