PLEASE HELP ME WITH MY HOMEWORK!!!!!2. A metal bar is 100cm long. It is heated for an hour. What could be the new length of the bar? a)102cm b)99cm c)98cm d)99.2cm
3. Why are there gaps in concrete roads?
a)to allow for contraction
b)cheaper
c)to allow for expansion
d)it makes it easier to repair one section of the road

Answers

Answer 1

Answer:

2 b

3 d

you are welcome for that

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Which clement is a liquid at STP?
(1) bromine (3) francium

(2) cesium (4) iodine

Answers

(1) bromine ..................

(1) Bromine is the correct answer.

Which type of fermentation sometimes occurs in people

Answers

lactic acid fermentation

How do you test a hypothesis using scientific inquiry

Answers

Once you have constructed an effective hypothesis, the next step in the scientific inquiry process is to test the hypothesis through experimentation. This is a great opportunity for students to start a science notebook, if they have not yet started recording their progress. Steps to Identifying and Conducting an Appropriate Experiment to Test a Hypothesis 1) Present Hypotheses  Make a list of all potential hypotheses to be tested. 2) Make Predictions  For each hypothesis, ask what would be true if the hypothesis were true. 3) Write the Experimental Procedure  The experimental procedure is a step-by-step recipe for the science experiment. A good procedure contains enough detail that someone else could easily duplicate the experiment. Once you have formed a hypothesis, you will need to develop your experimental procedure to test whether your hypothesis is true or false. 4) Identify the Independent and Dependent Variables  The first step of designing the experimental procedure involves planning how to change the independent variable and how to measure the impact that this change has on the dependent variable. To guarantee a fair test when conducting the experiment, make sure that the only thing changing is the independent variable. All controlled variables must remain constant. 5) Design the Experiments  How can you identify an appropriate experiment that will effectively test your hypothesis? Begin by asking yourselves, “What can I do that will give me one result if my hypothesis is true, and a different result if my hypothesis is false?” Design at least one possible experiment for each hypothesis. Be sure that each experiment tests only one hypothesis.

A pressure of 655 mm hg is equal to how many atmospheres

Answers

Answer:

0.861842

Explanation:

One atm. equals 760.0 mm Hg, so there will be a multiplication or division based on the direction of the change. Example #1: Convert 0.875 atm to mmHg. Solution: multiply the atm value by 760.0 mmHg / atm.

What numbers should be added to the blanks to balance this chemical equation? ___F2 + __ H20 --------> ___OF2 + ___HF A) 2,2,1,2
B)2,1,1,2
C)3,2,1,4
D)1,2,2,1

Answers

The numbers to be added to the blanks to balance this chemical equation are 2, 1 , 1 and 2

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

$2F_2+H_2O\rightarrow OF_2+2HF$

Thus in the reactants, there are 2 atoms of hydrogen , 1 atom of oxygen and 4 atoms of flourine.Thus there will be atoms of hydrogen , 1 atom of oxygen and 4 atoms of flourine in the product as well.

Learn more about conservation of mass

brainly.com/question/12335419

brainly.com/question/11954533

1. Is O2 a compound? Explain.2. Is O2 a molecule? Explain.

3. State the law of conservation of matter, and give an example demonstrating its meaning.

4. Electrolysis is used to break liquid water into hydrogen and oxygen gas. If I begin with 10 grams of liquid water, will the total mass of the two gases be greater than, less than, or equal to 10? Why?

5.What kind of observations can indicate a transfer of energy has taken place in a reaction?

Answers

1. O2 is not a compound because it only contains one or more type of the same element atom.
2. O2 is a molecule because a molecule is one or more of the same element atom.
3. The law of conversion is that the mass of the system will stay the same when transfer takes place. Like if you had an equation O+H2—> H2O the mass will remain the same.

4. It will be equal to 10 because of law of conservation of matter.

5. One observation can be that the compound, reaction you’re observing, has change states.

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