Question
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
15 grams
15 grams
60 grams
60 grams
30 grams
30 grams
10 grams
25 answers
The correct answer is 60 grams. The total mass of the products is equal to the sum of the masses of carbon dioxide (CO2) and calcium oxide (CaO). Since the chemical reaction does not specify any other reactants or products, we assume that the entire 30 grams of calcium carbonate is converted into these products. Therefore, the mass of carbon dioxide and calcium oxide would be equal to 30 grams each, resulting in a total mass of 60 grams.
Which is most likely to occur during a chemical reaction?(1 point)
Responses
New atoms are created.
New atoms are created.
The original substance maintains its properties.
The original substance maintains its properties.
Mass is conserved.
Mass is conserved.
Atoms of the original substance are lost.
Responses
New atoms are created.
New atoms are created.
The original substance maintains its properties.
The original substance maintains its properties.
Mass is conserved.
Mass is conserved.
Atoms of the original substance are lost.
The correct answer is "Mass is conserved." During a chemical reaction, mass is conserved, meaning that the total mass of the reactants is equal to the total mass of the products. Atoms are not created or lost during a chemical reaction, and while the properties of the substances may change, the original substance does not maintain its properties.
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.
The atoms of the reactants are regrouped during the reaction.
The atoms of the reactants are regrouped during the reaction.
Atoms of Na are destroyed during the reaction.
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.
The atoms of the reactants are regrouped during the reaction.
The atoms of the reactants are regrouped during the reaction.
Atoms of Na are destroyed during the reaction.
The correct answer is "The atoms of the reactants are regrouped during the reaction." In a chemical reaction, the atoms of the reactants are rearranged to form the products. In this particular reaction, the atoms of sodium (Na), hydrogen (H), carbon (C), and oxygen (O) are regrouped to form new compounds. There is no destruction of Na atoms or an increase in the number of H atoms or mass.
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
8
8
5
5
2
2
4
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
8
8
5
5
2
2
4
The correct answer is 4.
In the given chemical reaction, we have 2 molecules of hydrogen (H2) as reactants. Each H2 molecule contains two hydrogen atoms. Therefore, the total number of hydrogen atoms before the reaction is 2 (H2 molecules) * 2 (hydrogen atoms per molecule) = 4 hydrogen atoms.
In the products of the reaction, we have 2 molecules of water (H2O). Each water molecule contains 2 hydrogen atoms. Therefore, the total number of hydrogen atoms after the reaction is 2 (H2O molecules) * 2 (hydrogen atoms per water molecule) = 4 hydrogen atoms.
Hence, there are still 4 atoms of hydrogen present after the reaction.
In the given chemical reaction, we have 2 molecules of hydrogen (H2) as reactants. Each H2 molecule contains two hydrogen atoms. Therefore, the total number of hydrogen atoms before the reaction is 2 (H2 molecules) * 2 (hydrogen atoms per molecule) = 4 hydrogen atoms.
In the products of the reaction, we have 2 molecules of water (H2O). Each water molecule contains 2 hydrogen atoms. Therefore, the total number of hydrogen atoms after the reaction is 2 (H2O molecules) * 2 (hydrogen atoms per water molecule) = 4 hydrogen atoms.
Hence, there are still 4 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
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 correct equation that demonstrates the Law of Conservation of Mass is:
2H2O2→2H2O+O2
This equation shows that 2 molecules of hydrogen peroxide (H2O2) react to form 2 molecules of water (H2O) and 1 molecule of oxygen (O2). The balanced equation ensures that the mass of the reactants is equal to the mass of the products, thereby conserving mass.
2H2O2→2H2O+O2
This equation shows that 2 molecules of hydrogen peroxide (H2O2) react to form 2 molecules of water (H2O) and 1 molecule of oxygen (O2). The balanced equation ensures that the mass of the reactants is equal to the mass of the products, thereby conserving mass.
Flies are scavengers and tend to break down dead organisms. Based on this information, what is a plant characteristic that would best attract flies?
flowers that are brightly colored
flowers that emit a sweet odor
flowers that are light colored
flowers that emit a rotten odor
flowers that are brightly colored
flowers that emit a sweet odor
flowers that are light colored
flowers that emit a rotten odor
Flowers that emit a rotten odor would best attract flies. Flies are attracted to decaying or decomposing matter, so a flower that emits a rotten odor would mimic the smell of decaying organisms and attract flies to aid in the breakdown of dead organisms.
Which of the following describes fertilization?
the process of pollen moving from place to place
when an animal is attracted to a flower
the changes that occur in organisms over time
when a sperm cell and egg cell come together
the process of pollen moving from place to place
when an animal is attracted to a flower
the changes that occur in organisms over time
when a sperm cell and egg cell come together
When a sperm cell and an egg cell come together is the definition of fertilization. It is the process by which a sperm cell fuses with an egg cell, resulting in the formation of a zygote, which will develop into a new organism.
Specialization can be both limiting and beneficial. How would a plant species benefit from a pollinator that only visits the flowers of that plant species?
the flowers always having a pollinator
decreased self-fertilization, allowing for greater genetic variation
less competition for pollinators with other species
less competition for pollinators within the species
the flowers always having a pollinator
decreased self-fertilization, allowing for greater genetic variation
less competition for pollinators with other species
less competition for pollinators within the species
A plant species would benefit from a pollinator that only visits the flowers of that plant species by experiencing less competition for pollinators within the species. When a pollinator exclusively visits the flowers of a particular plant species, it reduces the risk of other plant species competing for the same pollinator. This allows the plant species to have increased access to pollination, ensuring that its flowers are effectively pollinated and increasing the chances of successful reproduction.
Sometimes, plants will reward their pollinators with something that benefits them. What is an example of a plant attractant that is also a pollination reward?
nectar
vibrant colors
sweet odors
pollen
nectar
vibrant colors
sweet odors
pollen
Nectar is an example of a plant attractant that serves as a pollination reward. Nectar is a sugary substance produced by flowers to attract pollinators, such as bees, butterflies, and hummingbirds. When these pollinators visit the flowers to feed on the nectar, they inadvertently transfer pollen from one flower to another, facilitating pollination. Thus, nectar acts as both an attractive reward for pollinators and a means for plants to ensure successful pollination.
Which event spread Islam to India?
conquest by invading Turks
the rise of the Mughal empire
Xuanzang's journey to India
the conversion of Akbar to Islam
conquest by invading Turks
the rise of the Mughal empire
Xuanzang's journey to India
the conversion of Akbar to Islam
The conquest by invading Turks is the event that spread Islam to India. The invasion of Turks, particularly the Delhi Sultanate in the medieval period, played a significant role in the spread of Islam throughout the Indian subcontinent. These Turkic rulers and their armies brought Islamic influence to India through conquest and subsequent rule. Their establishment of Muslim dynasties and the patronage of Islamic traditions and institutions helped establish Islam as a major religion in India.
What strengthened the economic and political power of the Chola empire?
new religious beliefs
maritime trade networks
brilliant bodhisattva leaders
new agricultural techniques
new religious beliefs
maritime trade networks
brilliant bodhisattva leaders
new agricultural techniques
Maritime trade networks strengthened the economic and political power of the Chola empire. The Cholas of South India established a vast maritime trade network that connected them with various regions in Southeast Asia, the Middle East, and East Africa. This trade network allowed the Cholas to export goods such as spices, textiles, and precious metals while importing valuable commodities from other regions. The revenue generated from this trade greatly enhanced the economic and political power of the Chola empire, contributing to their prosperity and influence.
Which movement led to changes in how Hinduism was practiced?
Vishnu
Bhakti
Devi
Nanak
Vishnu
Bhakti
Devi
Nanak
The Bhakti movement led to changes in how Hinduism was practiced. The Bhakti movement was a medieval religious movement in India that emphasized personal devotion and love towards a single, chosen deity. It sought to establish a direct relationship between the devotee and the divine, bypassing the need for complex rituals and elaborate priestly intermediaries. This movement had a significant impact on Hinduism by promoting a more individualistic and emotional approach to religious practice and breaking down traditional barriers of caste and social status.
Which beliefs influenced Sikhism?
Christianity and Judaism
Hinduism and Judaism
Hinduism and Islam
Islam and Christianity
Christianity and Judaism
Hinduism and Judaism
Hinduism and Islam
Islam and Christianity
Hinduism and Islam beliefs influenced Sikhism. Sikhism emerged in the 15th century in the region of Punjab, which had a cultural and religious influence from both Hinduism and Islam. The founder of Sikhism, Guru Nanak Dev Ji, drew inspiration from both religions and sought to create a synthesis of their teachings. Sikhism incorporates certain aspects of monotheistic Islam, such as the belief in one God and the rejection of idol worship, while also embracing elements of Hinduism, such as karma and reincarnation. Therefore, the beliefs of Hinduism and Islam played a significant role in shaping the principles and practices of Sikhism.