Use the chemical reaction to answer the question.
CaCO3→CO2+CaO
A scientist heats 30 grams of calcium carbonate (CaCO3
) in the chemical reaction shown. What is the total mass of the products?
(1 point)
Responses
10 grams
10 grams
30 grams
30 grams
15 grams
15 grams
60 grams
The total mass of the products in the chemical reaction is 60 grams.
Which is most likely to occur during a chemical reaction?(1 point)
Responses
Atoms of the original substance are lost.
Atoms of the original substance are lost.
New atoms are created.
New atoms are created.
Mass is conserved.
Mass is conserved.
The original substance maintains its properties.
Mass is conserved.
Use the chemical reaction to answer the question.
NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3
) and acetic acid (HC2H3O2
) to produce a chemical reaction shown. Which statement about the reaction is correct?
(1 point)
Responses
There are more H atoms after the reaction.
There are more H atoms after the reaction.
Some atoms gain mass after the reaction.
Some atoms gain mass after the reaction.
Atoms of Na are destroyed during the reaction.
Atoms of Na are destroyed during the reaction.
The atoms of the reactants are regrouped during the reaction.
The atoms of the reactants are regrouped during the reaction.
Use the chemical reaction to answer the question.
2H2+O2→2H2O
There are four atoms of hydrogen (H
) before the reaction. How many atoms of hydrogen are present after the reaction?
(1 point)
Responses
5
5
2
2
4
4
8
There are four atoms of hydrogen present after the reaction.
Use the chemical reaction to answer the question.
H2O2→H2O+O2
Which equation for this reaction demonstrates the Law of Conservation of Mass?
(1 point)
Responses
2H2O2→2H2O+2O2
2 cap h sub 2 cap o sub 2 rightarrow 2 cap h sub 2 cap o plus 2 cap o sub 2
2H2O2→2H2O+O2
2 cap h sub 2 cap o sub 2 rightarrow 2 cap h sub 2 cap o plus cap o sub 2
H2O2→H2O+O2
H2O2→H2O+O2
H2O2→H2O+2O2
The equation that demonstrates the Law of Conservation of Mass is:
2H2O2 → 2H2O + O2
A total of 7,803,100 tourists visited Country A from the year 2018 to the year 2020. Round to the nearest place value, then express this number in the form of a single digit times an integer power of 10.(1 point)
To express the number in the form of a single digit times an integer power of 10, we need to round the number to the nearest place value and then determine the power of 10.
Rounding 7,803,100 to the nearest place value, which is the nearest million, gives us 8,000,000.
To express 8,000,000 in the form of a single digit times an integer power of 10, we can rewrite it as:
8 * 10^6
Two weeks before an examination day, a librarian monitored the number of students who visited the library. Then they compared it with the number of visits made in an average week. Approximately 2×103
visits were reflected in their logbook during this two-week period, while only about 5×102
were reflected on an average week. How many times higher is the number of library visits before examination day compared to the library visits in an average week? Your answer should be a whole number.(1 point)
To determine how many times higher the number of library visits before the examination day is compared to the visits in an average week, we need to divide the number of visits before the examination day by the number of visits in an average week.
Approximately 2x10^3 visits were recorded before the examination day, while approximately 5x10^2 visits were recorded in an average week.
Dividing 2x10^3 by 5x10^2 gives us:
(2x10^3) / (5x10^2) = (2/5) x (10^3/10^2) = 0.4 x 10 = 4
Therefore, the number of library visits before the examination day is 4 times higher than the number of visits in an average week.
It takes 10 years for a $100 monthly bank deposit to amount to $15,528.23 when invested at 5% interest compounded monthly. Round to the nearest place value, then express the amount $15,528.23 in the form of a×10n
where a
is single digit.(1 point)
To express $15,528.23 in the form of a×10^n, we can round it to the nearest whole number, which is $15,528.
Then, we can rewrite $15,528 in scientific notation by moving the decimal point to the left until we have a single non-zero digit to the left of the decimal point and keeping track of the number of decimal places we moved.
In this case, we need to move the decimal point 4 places to the left, so we have 1.5528.
Finally, we express this in the form of a×10^n as 1.5528 × 10^4.
The radius of a hydrogen atom is 0.0000000529177 of a millimeter. Express this number as an approximation.
0.0000000529177 of a millimeter can be approximated as 5.29 x 10^-8 millimeters.
The radius of a hydrogen atom is 0.0000000529177 of a millimeter. Express this number as an approximation.(1 point)
Responses
0.00000006
0.00000006
0.00000005
0.00000005
0.0000000053
0.0000000053
0.0000005
The approximation for the radius of a hydrogen atom given as 0.0000000529177 of a millimeter is 0.00000005.
How many times is 4 × 104 larger than 2 × 102 ?
To determine how many times 4 x 10^4 is larger than 2 x 10^2, we can divide the larger number by the smaller number:
(4 x 10^4) / (2 x 10^2)
Simplifying this expression:
(4/2) x (10^4 / 10^2)
= 2 x 10^2
= 200
Therefore, 4 x 10^4 is 200 times larger than 2 x 10^2.
At the end of fiscal year 2004, the federal debt of Country C is $278,560,125,000. What is the closest estimation of this amount? Express your answer in the form of a single digit times an integer power of 10.(1 point)
The amount $278,560,125,000 can be expressed as 2.78560125 × 10^11.
How many times less is 102 than 106 ? Express your answer as an integer power of 10.(
To determine how many times less 10^2 is than 10^6, we can divide the larger value by the smaller value:
(10^6) / (10^2)
Simplifying this expression:
10^(6-2)
= 10^4
Therefore, 10^2 is 10,000 times less than 10^6.
Roughly, it takes light less than 0.000000003 of a second to travel a one-meter distance. Express this number in the form of a × 10n where 1 < a < 10 and is a one-digit number.
The given measurement is expressed as less than 0.000000003 of a second.
Approximating this number, we can rewrite it as 3 x 10^(-9) seconds.
Therefore, in the form of a × 10^n, where 1 < a < 10 and a is a one-digit number, the number is approximately 3 x 10^(-9).
Write 0.000456 in scientific notation.
0.000456 in scientific notation is 4.56 x 10^(-4).
One fluid ounce is equivalent to 0.0078125 US liquid gallon. How do you write 0.0078125 in scientific notation?(1 point)
0.0078125 in scientific notation is 7.8125 x 10^(-3).
What is the number 5.1×107 written in decimal notation?(1 point)
The number 5.1 x 10^7 in decimal notation is 51,000,000.
What is the number 6.3×10−4 written in decimal notation?(1 point)
The number 6.3 x 10^(-4) in decimal notation is 0.00063.
A wasp’s stinger has an average length of 2.67×10−3 meter long. What is this length in decimal notation?
The length of a wasp's stinger, 2.67 x 10^(-3) meters, in decimal notation is 0.00267 meters.
Write 0.000000065 in scientific notation.
0.000000065 in scientific notation is 6.5 x 10^(-8).
The speed of light is about 671,000,000 miles per hour. How will you write this number in scientific notation?
The speed of light, 671,000,000 miles per hour, in scientific notation is 6.71 x 10^8 miles per hour.
Suppose an average person blinks 15 times per hour. How many times does an average person blink in a year? Write the answer in scientific notation (Hint: 1 year = 365 days, 1 day = 24 hours).
To calculate the number of times an average person blinks in a year, we need to multiply the number of blinks per hour by the number of hours in a day and then by the number of days in a year.
Number of blinks per year = Number of blinks per hour x Number of hours in a day x Number of days in a year
Number of blinks per year = 15 blinks/hour x 24 hours/day x 365 days/year
Simplifying this expression:
Number of blinks per year = 131,400 blinks/year
Therefore, an average person blinks approximately 1.314 x 10^5 times in a year.
What is the number 5.9×105 written in decimal notation?
The number 5.9 x 10^5 in decimal notation is 590,000.
What is the number 7.3×10−8 written in decimal notation?
The number 7.3 x 10^(-8) in decimal notation is 0.000000073.
Use scientific notation to determine which of these numbers is greater: 34,835,760 or 43,835,760. Write your answer in scientific notation, expressed to the exact decimal place.
To compare these numbers in scientific notation, we can rewrite them by shifting the decimal point until we have a single non-zero digit to the left of the decimal point.
- For 34,835,760, we can write it as 3.483576 x 10^7.
- For 43,835,760, we can write it as 4.383576 x 10^7.
Comparing the coefficients, we can see that 4.383576 is greater than 3.483576.
Therefore, 43,835,760 is greater than 34,835,760 in scientific notation.
When would you use a primary source, and when would you use a secondary source? Why?
You would use a primary source when you want to directly investigate or analyze an event, topic, or phenomenon. Primary sources are original, firsthand accounts, records, or data that have not been interpreted or analyzed by others. They can include diaries, letters, speeches, interviews, photographs, raw data, or original research articles.
Primary sources are valuable in research because they give you direct access to the original information, allowing you to interpret and analyze it for yourself. They provide a firsthand perspective and can offer valuable insights and details that may not be available in secondary sources.
On the other hand, you would use a secondary source when you want to access analysis, interpretation, or summaries of primary sources. Secondary sources are works that are written or created by individuals who did not directly witness or participate in an event or research study. They include textbooks, review articles, scholarly journals, and books that discuss, analyze, and interpret primary sources.
Secondary sources are helpful because they provide a broader context, synthesis, and interpretation of primary sources. They can help you gain a deeper understanding of a topic by summarizing and analyzing information from multiple primary sources. They can also provide additional perspectives, explanations, and interpretations that may enhance your research.
In summary, primary sources are used to access original, firsthand data or accounts, while secondary sources are used to access analysis, interpretation, and summaries of primary sources. Both types of sources are important in research, as they provide different perspectives and complement each other in understanding a topic.
What can you do to make someone or something look bad in propaganda? Give three examples
In propaganda, there are several techniques that can be used to make someone or something look bad. Here are three examples:
1. Name-calling: Using derogatory or negative language to associate a person or group with negative traits or actions. This can create a negative perception and bias against them. For instance, labeling a political opponent as a "corrupt politician" or a social group as "criminals" can create a negative image in the minds of the audience.
2. Stereotyping: Generalizing and oversimplifying a person, group, or idea based on a few characteristics, often negative ones. By attributing negative characteristics to an entire group, propaganda can create prejudice and reinforce negative perceptions. For example, associating a particular ethnic group with violence or a religious group with extremism.
3. Manipulating visuals: Carefully selecting images, videos, or symbols that evoke negative emotions or create a negative impression. By using specific shots or angles, editing techniques, or visual cues, propaganda can make someone or something appear menacing, dangerous, or untrustworthy. This can include showing an opponent in an unflattering light, using dark or ominous colors, or presenting out-of-context footage.
It's important to note that these techniques are manipulative and often result in biased or unfair portrayals. They are commonly used in propaganda to sway public opinion and shape perceptions.
In what way is the bandwagon technique similar to peer pressure?
The bandwagon technique and peer pressure are similar in that they both rely on the desire to conform to the actions or beliefs of others.
The bandwagon technique is a persuasive technique where individuals are encouraged to adopt a certain behavior because "everyone else is doing it." The idea is that if everyone is participating or supporting something, it must be popular or valid, and therefore, the individual should join in to avoid missing out or appearing out of touch.
Peer pressure, on the other hand, is the social influence exerted by one's peers or social group to conform to certain actions, behaviors, or beliefs. It often arises from the desire to fit in, be accepted, or avoid negative consequences from other group members.
Both the bandwagon technique and peer pressure exploit the human tendency to seek validation and acceptance from others. They leverage the fear of missing out, the desire to belong, and the potential consequences of going against the group. By exploiting these motivations, both techniques persuade individuals to align their actions or beliefs with the majority or their peers.
Do card stacking messages give you information?
No, card stacking messages in propaganda do not provide balanced or objective information. Card stacking is a propaganda technique where only one side of an argument or topic is presented, deliberately omitting or downplaying opposing viewpoints or evidence.
In card stacking, information is intentionally selected and presented in a biased manner to favor a particular agenda or perspective. The goal is to manipulate the audience's perception by providing a one-sided portrayal that supports a specific position while ignoring or distorting contradictory information.
Instead of offering a comprehensive view of the topic or issue, card stacking messages manipulate information to influence public opinion or push a particular narrative. As a result, they can be misleading and present an incomplete or distorted picture of the subject matter by omitting critical information and opposing arguments.
Use scientific notation to determine which of these numbers is greater: 34,835,760 or 43,835,760. Write your answer in scientific notation
To compare these numbers in scientific notation, we can rewrite them by shifting the decimal point until we have a single non-zero digit to the left of the decimal point.
- For 34,835,760, we can write it as 3.483576 x 10^7.
- For 43,835,760, we can write it as 4.383576 x 10^7.
Comparing the coefficients, we can see that 4.383576 is greater than 3.483576.
Therefore, 43,835,760 is greater than 34,835,760 in scientific notation, which can be represented as 4.383576 x 10^7.
Use scientific notation to determine which of these numbers has the least value: 123,893, 31,892, or 12,786. Write your answer in scientific notation, expressed to the exact decimal place.
To compare these numbers in scientific notation, we need to rewrite them with the same exponent:
- For 123,893, we can write it as 1.23893 x 10^5.
-
Which statement is true about transitions?(1 point)
Responses
Transitions connect ideas for the reader.
Transitions connect ideas for the reader.
Transitions can also be called topic sentences.
Transitions can also be called topic sentences.
Transitions are found at the end of sentences.
Transitions are found at the end of sentences.
Transitions can make writing unclear to the reader.