On the periodic table, which group of elements tend to form positive ions?

Group 16 and Group 17

Group 1 and Group 16

Group 2 and Group 17

Group 1 and Group 2

8. "With this booming economy, no one believed this prosperity was going away." What is the bestmeaning of prosperity in this quote?(0.5 Points)A. challengeB. powerC. successD. strength When planning a simple experiment, what does it mean to test one variable? a During the experiment, the scientist keeps the control the same but changes many other elements he or she is testing. b During the experiment, the scientist has only one element, or variable, that is changed to test the hypothesis. c The scientist can only use simple language and materials when planning the one variable to be tested. d The scientist plans and performs just one science experiment a day to test one variable. explain how you can tell whether a group of ratios represents a proportional relationship. PLEASE HELP Find the roots. 2x^2+7x-15=0 what is the x-intercept of the graph 4x-6y=12 SALT Cartoon Analysis: What is the cartoonist saying about the strain that the nuclear arms race is causing in the United States and the Soviet Union? 2. When a population stops growing because it has reached the maximum number that the environment can support, the population has reachedA a ceilingB. carrying capacityC. a critical pointD. population density The photo shows a scientific occurrence called a sundog. How might a person living in ancient times interpret this event? Why? mention four reasons why it is important to apply for entry at tertiary institutions while you are still at grade 10 2.Do the data in the table represent a direct variation or an inverse variation? Write an equation to model the data in the table.inverse variation; xy = 12inverse variation; [tex]\frac{y}{x} =12[/tex]direct variation; y = 12xdirect variation; [tex]y=\frac{12}{x}[/tex] A hydrogen fuel cell is an electrochemical reactor in which oxygen and hydrogen gas are reacted to produce energy. Rather than combusting hydrogen in the presence of oxygen, the overall reaction (1/2) O2 H2 H2O is actually carried out as two `half-reactions occurring at separate electrodes. To complete the reaction, this forces electrons to pass through an external circuit from one electrode to the other, and this current can be used to do work; e.g., by driving a motor. Typical operating conditions for a solid-oxide fuel cell are 500-900 C and 5-15 bar. Consider a fuel cell in which a pure oxygen stream and a pure hydrogen stream enter at 11 bar and 700 C with stoichiometric flowrates. Assume that these reactants are consumed completely, and that the water generated by the reaction leaves in a third stream at the same T and P. Assume that the fuel cell operates at steady-state with a uniform temperature of 700 C. a) Write simplified first and Give two examples of pioneer species. 3.What is Shirley Chisholm's overall purpose in her speech?A. to discredit the other candidates running for the Democratic nominationB. to persuade people that she is the right choice for the Democratic nominationC. to convince people that she has overwhelming support for the DemocraticnominationD. to pressure people to vote for her for the Democratic nomination the polynomial y = x^{5} + x^{3} - x^{2} - 1 factors into (x^{2} + 1) (x^{3} - 1). what is the multiplicity of the root (x^{3} - 1)? 1. Which of the following occurrence can be explainby convection?A. How a fire place can heat up people in a roomB. How the heat of the sun reaches earthC. Why a handle of a metal spoon also gets hot whenplaced on a steamy soupD. Why chilly air always remains near the floor2. Which of the following is NOT true about heat?A. It is a form of energyB. It transfers from one object to another.C. It is caused by a temperature difference betweentwo objectsD. It determines the hotness or coldness of an object3. Which of the following describes heat?A. Energy stored in all objects regardless oftemperatureB. Energy that causes objects to have temperature.C. Energy transferred due to difference in materialsD. Energy transferred due to temperature differences4. An unknown object is placed in contact with a heatsource. It was observed that the object did not increaseits temperature Which of the following explains why?A. The object is heated too much.B. The object is heated via radiation.C. The object is a thermal insulator,D. The object is a thermal conductor. The brain can affect the way the body functions but the body can not affect the way the brain functions. A.TrueB.False Kianna started her homework at 4:30 pm. She finished at 5:05 pm. How many SECONDS did it take her to finish her homework? *1 point 3) Determine the greatest common factor betweenXy2 and x6y2 add 8 and 17, double the sum, and then subtract three A horizontal spring is lying on a frictionless surface. One end of the spring is attached to a wall, and the other end is connected to a movable object. The spring and object are compressed by 0.065 m, released from rest, and subsequently oscillate back and forth with an angular frequency of 11.3 rad/s. What is the speed of the object at the instant when the spring is stretched by 0.048 m relative to its unstrained length