![subject](/tpl/images/cats/biologiya.png)
1.What do you call the number in front of a chemical formula that tells how many atoms or molecules of a substance take part in the reaction?
A) yield
B) coefficient
C) symbol
D) subscript
2.A balanced equation has ?
A) the same number of reactants as products
B) the same total number of coefficients on both sides of the equation
C) the same number of each kind of atom on both sides of the equation
D) an equal number of molecules on both sides of the equation
3.In a chemical reaction, the total mass of the products .
A) must always be the same as the total mass of the reactants
B) is always less than the total mass of the reactants in an open system
C) can be greater or less than the total mass of the reactants
D) must be less than the total mass of the reactants
4.Due to the principle of conservation of mass, .
A) all chemical formulas have coefficients
B) all chemical reactions must have an equal number of reactants and products.
C) all chemical reactions must take place in open systems
D) all chemical equations must be balanced
help me please
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Biology
![question](/tpl/images/cats/biologiya.png)
Biology, 21.06.2019 19:30
Sarah is sitting at the top of the slide in the schools playground. which will increase sarah’s kinetic energy a- an additional child is added to the top of the slide. b- sarah is pushed and moves down the slide. c- sarah climbs down the ladder and off the slide. d- the ladder is moved to the other side of the yard.
Answers: 1
![question](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 08:30
Both male and female gametes are created during the process of meiosis. the formation of male gametes is called spermatogenesis. after telophase il of spermatogenesis, there would be are all genetically male gametes created that
Answers: 2
![question](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 08:30
The image below shows a weather service map. which details best describe this map? check all that apply
Answers: 1
![question](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 17:00
The us council on environmental quality, the world wildlife fund of the united states, the ecological society of america, the smithsonian institution, and the international union for the conservation of nature have proposed four principles of wildlife conservation. which of the following does not apply to wildlife conservation? a) continuous monitoring, analysis, and assessment b) ecosystem maintenance that includes wildlife c) a plan encompassing entire communities of organisms and all renewable resources d) a continued interest in harvesting populations for sport
Answers: 1
You know the right answer?
1.What do you call the number in front of a chemical formula that tells how many atoms or molecules...
Questions
![question](/tpl/images/cats/informatica.png)
Computers and Technology, 01.04.2021 06:10
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mkx.png)
Arts, 01.04.2021 06:10
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 06:10
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 06:10
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 06:10
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 06:10
![question](/tpl/images/cats/biologiya.png)
Biology, 01.04.2021 06:10
![question](/tpl/images/cats/himiya.png)
Chemistry, 01.04.2021 06:10
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 06:10
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 06:10
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/en.png)
English, 01.04.2021 06:10
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 06:10
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/istoriya.png)
History, 01.04.2021 06:10
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 06:10
![question](/tpl/images/cats/mat.png)