CHEMISTRY MIDDLE SCHOOL

Prepare a 0.50 L of a 1.0 M solution of potassium sulfate. Determine the amount of potassium sulfate needed in correct significant figures.A) 68 g
B) 87 g
C) 270 g
D) 349 g
I can't figure out the answer.

Answers

Answer 1

Answer:

Answer:

B) 87g

Explanation:

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Which best explains the effect of chemicals on the environment ?

Answers

Chemicals can enter the air, water, and soil when they are produced, used or disposed.

What are chemicals?

A chemical is any substance consisting of matter. This includes any liquid, solid, or gas. A chemical is any pure substance (an element) or any mixture (a solution, compound, or gas).

Chemicals are the basic building blocks that make up all living and non-living things on Earth.

Chemicals can enter the air, water, and soil when they are produced, used or disposed.

Their impact on the environment is determined by the amount of the chemical that is released, the type and concentration of the chemical, and where it is found.

Some chemicals are of concern as they can work their way into the food chain and accumulate and/or persist in the environment for many years.

Some chemicals are synthetic, and are used in every day products from medicines to computers to fabrics and fuels.

Other chemicals are not made deliberately but are by-products of chemical processes.

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Answer:

Many chemicals are used to improve the quality of our lives and most are not harmful toWhat are chemicals?

Chemicals are the basic building blocks that make up all living and non-living things on Earth. Many chemicals occur naturally in the environment, and may be found in our air, water, food, and homes. Some chemicals are synthetic, and are used in every day products from medicines to computers to fabrics and fuels. Other chemicals are not made deliberately but are by-products of chemical processes.

the environment or human health. However, some chemicals have the potential to cause harm, in certain amounts, and should only be used when the potential risks are appropriately managed.

How do chemicals affect the environment?

Chemicals can enter the air, water, and soil when they are produced, used or disposed. Their impact on the environment is determined by the amount of the chemical that is released, the type and concentration of the chemical, and where it is found. Some chemicals can be harmful if released to the environment even when there is not an immediate, visible impact. Some chemicals are of concern as they can work their way into the food chain and accumulate and/or persist in the environment for many years.

What is the Government doing to protect our environment?

The Government of Canada plays a key role in protecting the environment from harmful chemicals. In Canada, the manufacture, import and use of chemicals are regulated by a number of laws, including the Canadian Environmental Protection Act, 1999, the Hazardous Products Act, the Food and Drugs Act, and the Pest Control Products Act.

The Canadian Environmental Protection Act, 1999, is the primary piece of legislation used to protect the environment from harmful chemicals. At the federal level, the environment is also protected through other legislation such as the Fisheries Act, which can also be used to protect water and aquatic life. In total, the Government of Canada is responsible for over 25 different Acts covering environment and environmental health issues.

Under the Canadian Environmental Protection Act, 1999, Government of Canada scientists assess chemicals to determine potential risks posed to human health and the environment, and the ways in which humans or the environment can be exposed to them. Based on these findings, appropriate regulations and other risk management tools may be put in place to reduce or prevent risks.

In 2006, the Government of Canada launched the Chemicals Management Plan (CMP) to further enhance its role in protecting Canadians and their environment from exposure to harmful chemicals. The Chemicals Management Plan uses a number of Acts (such as the Canadian Environmental Protection Act, 1999, the Hazardous Products Act, the Pest Control Products Act, etc.) to identify harmful chemicals and enable the Government to take early action on substances so that they are managed before they enter the environment and become a problem for future generations. The Chemicals Management Plan includes observations of sensitive species through an ecological monitoring program which will also serve as an "early warning" system for harmful substances in the ecosystem.

The Government of Canada works closely with provinces and municipalities to help reduce the risks of harmful chemicals. In addition, because pollution does not stop at borders, the Government of Canada works with other countries to build a consistent international and regional approach to the safe management of chemicals.

What can I do to help the environment?

There are many things you can do to help protect the environment. Carefully read all of the information on product labels and use chemicals only as directed. Informed consumers can often find safe alternatives for many harmful chemicals that are found in products they use, which are better for the environment. It is also important to be familiar with municipal waste and recycling programs so that you can properly dispose of products such as batteries and plastics. Other actions to protect the environment can include walking short distances instead of driving and ensuring your car is running at peak efficiency to reduce gasoline consumption.

Explanation:

What are chemicals?

What scientists do that is the basis for their investigations

Answers

Scientists conduct investigations based on systematic observations, research questions, and the development of testable hypotheses.

What isd the wprk of scientists

They design experiments, collect data, and analyze it using statistical methods. Peer review and replication are important for ensuring the validity of findings.

Scientists collaborate, communicate their results, and develop theories to explain natural phenomena. The scientific method and critical thinking are central to their work.

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Scientists use curiosity, imagination, and previous scientific study to create research questions and hypotheses to begin their investigations into natural phenomenon. They use this process which formally is called the scientific method to carefully construct experiments to guide investigations of the world around them.

What is the purpose of a catalyst in the production of hydrogen?

Answers

Answer:To speed up the rate of hydrogen production

Explanation:

In the preparation of Hydrogen from the action of dilute acid on zinc metal, few drops of Copper(II)tetraoxosulphate(VI) solution is added to speed up the rate of production.

The hydrogen produced is shown in the equation below

Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)

Thus, Copper(II)tetraoxosulphate(VI) solution, a catalyst is used to speed up hydrogen production.

What kind of particles make up a compound

Answers

Two or more elements make up a compound

Answer:

Two or more elements make up a compound.

Explanation:

Which volume of 0.10 M NaOH(aq) exactly neutralizes 1.50 milliliters of 0.20 M HBO3(aq)?

Answers

From the information given above, NAOH is a base and HNO3 is an acid.
The chemical equation for the reaction is as follows"
NAOH + HNO3 = NANO3 + H2O
From these equation, we can see that the mole ratio of acid to base is 1:1.
In the question, we are given the following information:
Concentration of the acid, CA = 0.20 M
Volume of the acid, VA = 15 ML
Concentration of the base, CB = 0.10 M
We are to calculate the volume of the base, VB = ?
The formula for calculating volume and concentration for acid and base is as follows:
CA * VA = CB * VB
VB = CA * VA / CB = 0.20 * 15 / 0.1 = 3.0 / 0.1 = 30
VB = 30 ML.
Therefore, the volume of base required to neutralize the acid is 30 ml.

(3 Points)Which statement correctly compares radio waves and microwaves?

A. Radio waves have a higher frequency than microwaves.

B. Radio waves have shorter wavelengths than microwaves.

C. Radio waves have lower radiant energy than microwaves.

D. Only radio waves are used in communication.